annotate venv/lib/python2.7/site-packages/yaml/scanner.py @ 0:d67268158946 draft

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author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
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1
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2 # Scanner produces tokens of the following types:
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3 # STREAM-START
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4 # STREAM-END
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5 # DIRECTIVE(name, value)
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6 # DOCUMENT-START
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7 # DOCUMENT-END
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8 # BLOCK-SEQUENCE-START
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9 # BLOCK-MAPPING-START
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10 # BLOCK-END
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11 # FLOW-SEQUENCE-START
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12 # FLOW-MAPPING-START
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13 # FLOW-SEQUENCE-END
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14 # FLOW-MAPPING-END
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15 # BLOCK-ENTRY
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16 # FLOW-ENTRY
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17 # KEY
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18 # VALUE
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19 # ALIAS(value)
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20 # ANCHOR(value)
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21 # TAG(value)
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22 # SCALAR(value, plain, style)
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23 #
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24 # Read comments in the Scanner code for more details.
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25 #
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26
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27 __all__ = ['Scanner', 'ScannerError']
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28
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29 from error import MarkedYAMLError
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30 from tokens import *
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31
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32 class ScannerError(MarkedYAMLError):
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33 pass
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34
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35 class SimpleKey(object):
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36 # See below simple keys treatment.
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37
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38 def __init__(self, token_number, required, index, line, column, mark):
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39 self.token_number = token_number
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40 self.required = required
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41 self.index = index
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42 self.line = line
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43 self.column = column
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44 self.mark = mark
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45
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46 class Scanner(object):
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47
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48 def __init__(self):
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49 """Initialize the scanner."""
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50 # It is assumed that Scanner and Reader will have a common descendant.
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51 # Reader do the dirty work of checking for BOM and converting the
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52 # input data to Unicode. It also adds NUL to the end.
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53 #
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54 # Reader supports the following methods
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55 # self.peek(i=0) # peek the next i-th character
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56 # self.prefix(l=1) # peek the next l characters
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57 # self.forward(l=1) # read the next l characters and move the pointer.
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58
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59 # Had we reached the end of the stream?
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60 self.done = False
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61
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62 # The number of unclosed '{' and '['. `flow_level == 0` means block
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63 # context.
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64 self.flow_level = 0
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65
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66 # List of processed tokens that are not yet emitted.
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67 self.tokens = []
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68
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69 # Add the STREAM-START token.
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70 self.fetch_stream_start()
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71
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72 # Number of tokens that were emitted through the `get_token` method.
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73 self.tokens_taken = 0
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74
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75 # The current indentation level.
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76 self.indent = -1
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77
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78 # Past indentation levels.
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79 self.indents = []
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80
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81 # Variables related to simple keys treatment.
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82
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83 # A simple key is a key that is not denoted by the '?' indicator.
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84 # Example of simple keys:
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85 # ---
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86 # block simple key: value
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87 # ? not a simple key:
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88 # : { flow simple key: value }
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89 # We emit the KEY token before all keys, so when we find a potential
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90 # simple key, we try to locate the corresponding ':' indicator.
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91 # Simple keys should be limited to a single line and 1024 characters.
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92
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93 # Can a simple key start at the current position? A simple key may
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94 # start:
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95 # - at the beginning of the line, not counting indentation spaces
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96 # (in block context),
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97 # - after '{', '[', ',' (in the flow context),
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98 # - after '?', ':', '-' (in the block context).
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99 # In the block context, this flag also signifies if a block collection
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100 # may start at the current position.
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101 self.allow_simple_key = True
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102
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103 # Keep track of possible simple keys. This is a dictionary. The key
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104 # is `flow_level`; there can be no more that one possible simple key
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105 # for each level. The value is a SimpleKey record:
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106 # (token_number, required, index, line, column, mark)
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107 # A simple key may start with ALIAS, ANCHOR, TAG, SCALAR(flow),
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108 # '[', or '{' tokens.
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109 self.possible_simple_keys = {}
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110
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111 # Public methods.
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112
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113 def check_token(self, *choices):
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114 # Check if the next token is one of the given types.
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115 while self.need_more_tokens():
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116 self.fetch_more_tokens()
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117 if self.tokens:
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118 if not choices:
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119 return True
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120 for choice in choices:
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121 if isinstance(self.tokens[0], choice):
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122 return True
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123 return False
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124
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125 def peek_token(self):
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126 # Return the next token, but do not delete if from the queue.
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127 while self.need_more_tokens():
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128 self.fetch_more_tokens()
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129 if self.tokens:
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130 return self.tokens[0]
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131
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132 def get_token(self):
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133 # Return the next token.
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134 while self.need_more_tokens():
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135 self.fetch_more_tokens()
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136 if self.tokens:
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137 self.tokens_taken += 1
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138 return self.tokens.pop(0)
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139
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140 # Private methods.
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141
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142 def need_more_tokens(self):
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143 if self.done:
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144 return False
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145 if not self.tokens:
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146 return True
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147 # The current token may be a potential simple key, so we
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148 # need to look further.
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149 self.stale_possible_simple_keys()
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150 if self.next_possible_simple_key() == self.tokens_taken:
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151 return True
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152
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153 def fetch_more_tokens(self):
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154
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155 # Eat whitespaces and comments until we reach the next token.
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156 self.scan_to_next_token()
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157
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158 # Remove obsolete possible simple keys.
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159 self.stale_possible_simple_keys()
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160
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161 # Compare the current indentation and column. It may add some tokens
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162 # and decrease the current indentation level.
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163 self.unwind_indent(self.column)
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164
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165 # Peek the next character.
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166 ch = self.peek()
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167
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168 # Is it the end of stream?
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169 if ch == u'\0':
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170 return self.fetch_stream_end()
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171
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172 # Is it a directive?
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173 if ch == u'%' and self.check_directive():
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174 return self.fetch_directive()
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175
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176 # Is it the document start?
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177 if ch == u'-' and self.check_document_start():
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178 return self.fetch_document_start()
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179
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180 # Is it the document end?
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181 if ch == u'.' and self.check_document_end():
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182 return self.fetch_document_end()
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183
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184 # TODO: support for BOM within a stream.
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185 #if ch == u'\uFEFF':
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186 # return self.fetch_bom() <-- issue BOMToken
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187
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188 # Note: the order of the following checks is NOT significant.
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189
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190 # Is it the flow sequence start indicator?
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191 if ch == u'[':
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192 return self.fetch_flow_sequence_start()
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193
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194 # Is it the flow mapping start indicator?
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195 if ch == u'{':
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196 return self.fetch_flow_mapping_start()
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197
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198 # Is it the flow sequence end indicator?
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199 if ch == u']':
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200 return self.fetch_flow_sequence_end()
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201
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202 # Is it the flow mapping end indicator?
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203 if ch == u'}':
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204 return self.fetch_flow_mapping_end()
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205
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206 # Is it the flow entry indicator?
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207 if ch == u',':
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208 return self.fetch_flow_entry()
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209
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210 # Is it the block entry indicator?
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211 if ch == u'-' and self.check_block_entry():
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212 return self.fetch_block_entry()
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213
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214 # Is it the key indicator?
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215 if ch == u'?' and self.check_key():
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216 return self.fetch_key()
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217
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218 # Is it the value indicator?
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219 if ch == u':' and self.check_value():
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220 return self.fetch_value()
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221
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222 # Is it an alias?
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223 if ch == u'*':
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224 return self.fetch_alias()
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225
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226 # Is it an anchor?
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227 if ch == u'&':
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228 return self.fetch_anchor()
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229
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230 # Is it a tag?
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231 if ch == u'!':
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232 return self.fetch_tag()
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233
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234 # Is it a literal scalar?
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235 if ch == u'|' and not self.flow_level:
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236 return self.fetch_literal()
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237
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238 # Is it a folded scalar?
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239 if ch == u'>' and not self.flow_level:
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240 return self.fetch_folded()
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241
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242 # Is it a single quoted scalar?
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243 if ch == u'\'':
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244 return self.fetch_single()
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245
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246 # Is it a double quoted scalar?
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247 if ch == u'\"':
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248 return self.fetch_double()
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249
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250 # It must be a plain scalar then.
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251 if self.check_plain():
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252 return self.fetch_plain()
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253
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254 # No? It's an error. Let's produce a nice error message.
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255 raise ScannerError("while scanning for the next token", None,
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256 "found character %r that cannot start any token"
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257 % ch.encode('utf-8'), self.get_mark())
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258
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259 # Simple keys treatment.
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260
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261 def next_possible_simple_key(self):
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262 # Return the number of the nearest possible simple key. Actually we
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263 # don't need to loop through the whole dictionary. We may replace it
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264 # with the following code:
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265 # if not self.possible_simple_keys:
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266 # return None
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267 # return self.possible_simple_keys[
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268 # min(self.possible_simple_keys.keys())].token_number
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269 min_token_number = None
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270 for level in self.possible_simple_keys:
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271 key = self.possible_simple_keys[level]
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272 if min_token_number is None or key.token_number < min_token_number:
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273 min_token_number = key.token_number
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274 return min_token_number
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275
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276 def stale_possible_simple_keys(self):
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277 # Remove entries that are no longer possible simple keys. According to
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278 # the YAML specification, simple keys
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279 # - should be limited to a single line,
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280 # - should be no longer than 1024 characters.
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281 # Disabling this procedure will allow simple keys of any length and
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282 # height (may cause problems if indentation is broken though).
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283 for level in self.possible_simple_keys.keys():
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284 key = self.possible_simple_keys[level]
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285 if key.line != self.line \
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286 or self.index-key.index > 1024:
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287 if key.required:
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288 raise ScannerError("while scanning a simple key", key.mark,
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289 "could not found expected ':'", self.get_mark())
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290 del self.possible_simple_keys[level]
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291
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292 def save_possible_simple_key(self):
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293 # The next token may start a simple key. We check if it's possible
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294 # and save its position. This function is called for
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295 # ALIAS, ANCHOR, TAG, SCALAR(flow), '[', and '{'.
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296
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297 # Check if a simple key is required at the current position.
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298 required = not self.flow_level and self.indent == self.column
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299
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300 # A simple key is required only if it is the first token in the current
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301 # line. Therefore it is always allowed.
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302 assert self.allow_simple_key or not required
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303
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304 # The next token might be a simple key. Let's save it's number and
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305 # position.
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306 if self.allow_simple_key:
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307 self.remove_possible_simple_key()
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308 token_number = self.tokens_taken+len(self.tokens)
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309 key = SimpleKey(token_number, required,
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310 self.index, self.line, self.column, self.get_mark())
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311 self.possible_simple_keys[self.flow_level] = key
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312
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313 def remove_possible_simple_key(self):
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314 # Remove the saved possible key position at the current flow level.
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315 if self.flow_level in self.possible_simple_keys:
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316 key = self.possible_simple_keys[self.flow_level]
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317
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318 if key.required:
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319 raise ScannerError("while scanning a simple key", key.mark,
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320 "could not found expected ':'", self.get_mark())
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321
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322 del self.possible_simple_keys[self.flow_level]
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323
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324 # Indentation functions.
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325
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326 def unwind_indent(self, column):
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327
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328 ## In flow context, tokens should respect indentation.
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329 ## Actually the condition should be `self.indent >= column` according to
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330 ## the spec. But this condition will prohibit intuitively correct
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331 ## constructions such as
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332 ## key : {
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333 ## }
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334 #if self.flow_level and self.indent > column:
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335 # raise ScannerError(None, None,
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336 # "invalid intendation or unclosed '[' or '{'",
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337 # self.get_mark())
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338
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339 # In the flow context, indentation is ignored. We make the scanner less
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340 # restrictive then specification requires.
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341 if self.flow_level:
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342 return
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343
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344 # In block context, we may need to issue the BLOCK-END tokens.
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345 while self.indent > column:
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346 mark = self.get_mark()
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347 self.indent = self.indents.pop()
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348 self.tokens.append(BlockEndToken(mark, mark))
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349
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350 def add_indent(self, column):
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351 # Check if we need to increase indentation.
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352 if self.indent < column:
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353 self.indents.append(self.indent)
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354 self.indent = column
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355 return True
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356 return False
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357
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358 # Fetchers.
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359
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360 def fetch_stream_start(self):
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361 # We always add STREAM-START as the first token and STREAM-END as the
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362 # last token.
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363
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364 # Read the token.
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365 mark = self.get_mark()
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366
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367 # Add STREAM-START.
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368 self.tokens.append(StreamStartToken(mark, mark,
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369 encoding=self.encoding))
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370
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371
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372 def fetch_stream_end(self):
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373
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374 # Set the current intendation to -1.
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375 self.unwind_indent(-1)
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376
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377 # Reset simple keys.
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378 self.remove_possible_simple_key()
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379 self.allow_simple_key = False
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380 self.possible_simple_keys = {}
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381
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382 # Read the token.
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383 mark = self.get_mark()
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384
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385 # Add STREAM-END.
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386 self.tokens.append(StreamEndToken(mark, mark))
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387
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388 # The steam is finished.
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389 self.done = True
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390
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391 def fetch_directive(self):
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392
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393 # Set the current intendation to -1.
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394 self.unwind_indent(-1)
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395
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396 # Reset simple keys.
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397 self.remove_possible_simple_key()
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398 self.allow_simple_key = False
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399
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400 # Scan and add DIRECTIVE.
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401 self.tokens.append(self.scan_directive())
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402
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403 def fetch_document_start(self):
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404 self.fetch_document_indicator(DocumentStartToken)
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405
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406 def fetch_document_end(self):
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407 self.fetch_document_indicator(DocumentEndToken)
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408
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409 def fetch_document_indicator(self, TokenClass):
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410
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411 # Set the current intendation to -1.
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412 self.unwind_indent(-1)
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413
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414 # Reset simple keys. Note that there could not be a block collection
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415 # after '---'.
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416 self.remove_possible_simple_key()
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417 self.allow_simple_key = False
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418
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419 # Add DOCUMENT-START or DOCUMENT-END.
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420 start_mark = self.get_mark()
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421 self.forward(3)
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422 end_mark = self.get_mark()
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423 self.tokens.append(TokenClass(start_mark, end_mark))
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424
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425 def fetch_flow_sequence_start(self):
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426 self.fetch_flow_collection_start(FlowSequenceStartToken)
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427
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428 def fetch_flow_mapping_start(self):
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429 self.fetch_flow_collection_start(FlowMappingStartToken)
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430
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431 def fetch_flow_collection_start(self, TokenClass):
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432
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433 # '[' and '{' may start a simple key.
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434 self.save_possible_simple_key()
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435
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436 # Increase the flow level.
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437 self.flow_level += 1
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438
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439 # Simple keys are allowed after '[' and '{'.
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440 self.allow_simple_key = True
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441
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442 # Add FLOW-SEQUENCE-START or FLOW-MAPPING-START.
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443 start_mark = self.get_mark()
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444 self.forward()
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445 end_mark = self.get_mark()
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446 self.tokens.append(TokenClass(start_mark, end_mark))
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447
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448 def fetch_flow_sequence_end(self):
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449 self.fetch_flow_collection_end(FlowSequenceEndToken)
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450
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451 def fetch_flow_mapping_end(self):
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452 self.fetch_flow_collection_end(FlowMappingEndToken)
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453
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454 def fetch_flow_collection_end(self, TokenClass):
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455
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456 # Reset possible simple key on the current level.
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457 self.remove_possible_simple_key()
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458
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459 # Decrease the flow level.
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460 self.flow_level -= 1
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461
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462 # No simple keys after ']' or '}'.
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463 self.allow_simple_key = False
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464
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465 # Add FLOW-SEQUENCE-END or FLOW-MAPPING-END.
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466 start_mark = self.get_mark()
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467 self.forward()
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468 end_mark = self.get_mark()
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469 self.tokens.append(TokenClass(start_mark, end_mark))
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470
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471 def fetch_flow_entry(self):
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472
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473 # Simple keys are allowed after ','.
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474 self.allow_simple_key = True
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475
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476 # Reset possible simple key on the current level.
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477 self.remove_possible_simple_key()
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478
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479 # Add FLOW-ENTRY.
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480 start_mark = self.get_mark()
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481 self.forward()
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482 end_mark = self.get_mark()
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483 self.tokens.append(FlowEntryToken(start_mark, end_mark))
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484
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485 def fetch_block_entry(self):
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486
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487 # Block context needs additional checks.
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488 if not self.flow_level:
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489
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490 # Are we allowed to start a new entry?
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491 if not self.allow_simple_key:
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492 raise ScannerError(None, None,
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493 "sequence entries are not allowed here",
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494 self.get_mark())
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495
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496 # We may need to add BLOCK-SEQUENCE-START.
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497 if self.add_indent(self.column):
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498 mark = self.get_mark()
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499 self.tokens.append(BlockSequenceStartToken(mark, mark))
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500
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501 # It's an error for the block entry to occur in the flow context,
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502 # but we let the parser detect this.
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503 else:
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504 pass
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505
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506 # Simple keys are allowed after '-'.
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507 self.allow_simple_key = True
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508
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509 # Reset possible simple key on the current level.
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510 self.remove_possible_simple_key()
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511
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512 # Add BLOCK-ENTRY.
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513 start_mark = self.get_mark()
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514 self.forward()
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parents:
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515 end_mark = self.get_mark()
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516 self.tokens.append(BlockEntryToken(start_mark, end_mark))
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517
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518 def fetch_key(self):
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parents:
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519
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520 # Block context needs additional checks.
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parents:
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521 if not self.flow_level:
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parents:
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522
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bcclaywell
parents:
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523 # Are we allowed to start a key (not nessesary a simple)?
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524 if not self.allow_simple_key:
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parents:
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525 raise ScannerError(None, None,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
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526 "mapping keys are not allowed here",
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bcclaywell
parents:
diff changeset
527 self.get_mark())
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bcclaywell
parents:
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528
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parents:
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529 # We may need to add BLOCK-MAPPING-START.
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bcclaywell
parents:
diff changeset
530 if self.add_indent(self.column):
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bcclaywell
parents:
diff changeset
531 mark = self.get_mark()
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bcclaywell
parents:
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532 self.tokens.append(BlockMappingStartToken(mark, mark))
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bcclaywell
parents:
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533
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bcclaywell
parents:
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534 # Simple keys are allowed after '?' in the block context.
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bcclaywell
parents:
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535 self.allow_simple_key = not self.flow_level
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bcclaywell
parents:
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536
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bcclaywell
parents:
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537 # Reset possible simple key on the current level.
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bcclaywell
parents:
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538 self.remove_possible_simple_key()
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bcclaywell
parents:
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539
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bcclaywell
parents:
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540 # Add KEY.
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parents:
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541 start_mark = self.get_mark()
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parents:
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542 self.forward()
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parents:
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543 end_mark = self.get_mark()
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parents:
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544 self.tokens.append(KeyToken(start_mark, end_mark))
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545
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parents:
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546 def fetch_value(self):
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547
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parents:
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548 # Do we determine a simple key?
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parents:
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549 if self.flow_level in self.possible_simple_keys:
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bcclaywell
parents:
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550
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bcclaywell
parents:
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551 # Add KEY.
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bcclaywell
parents:
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552 key = self.possible_simple_keys[self.flow_level]
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parents:
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553 del self.possible_simple_keys[self.flow_level]
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bcclaywell
parents:
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554 self.tokens.insert(key.token_number-self.tokens_taken,
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bcclaywell
parents:
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555 KeyToken(key.mark, key.mark))
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parents:
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556
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bcclaywell
parents:
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557 # If this key starts a new block mapping, we need to add
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bcclaywell
parents:
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558 # BLOCK-MAPPING-START.
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bcclaywell
parents:
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559 if not self.flow_level:
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parents:
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560 if self.add_indent(key.column):
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bcclaywell
parents:
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561 self.tokens.insert(key.token_number-self.tokens_taken,
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bcclaywell
parents:
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562 BlockMappingStartToken(key.mark, key.mark))
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bcclaywell
parents:
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563
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bcclaywell
parents:
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564 # There cannot be two simple keys one after another.
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bcclaywell
parents:
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565 self.allow_simple_key = False
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parents:
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566
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bcclaywell
parents:
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567 # It must be a part of a complex key.
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parents:
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568 else:
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bcclaywell
parents:
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569
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bcclaywell
parents:
diff changeset
570 # Block context needs additional checks.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
571 # (Do we really need them? They will be catched by the parser
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bcclaywell
parents:
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572 # anyway.)
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bcclaywell
parents:
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573 if not self.flow_level:
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bcclaywell
parents:
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574
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bcclaywell
parents:
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575 # We are allowed to start a complex value if and only if
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bcclaywell
parents:
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576 # we can start a simple key.
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bcclaywell
parents:
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577 if not self.allow_simple_key:
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parents:
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578 raise ScannerError(None, None,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
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579 "mapping values are not allowed here",
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bcclaywell
parents:
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580 self.get_mark())
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bcclaywell
parents:
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581
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bcclaywell
parents:
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582 # If this value starts a new block mapping, we need to add
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bcclaywell
parents:
diff changeset
583 # BLOCK-MAPPING-START. It will be detected as an error later by
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bcclaywell
parents:
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584 # the parser.
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bcclaywell
parents:
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585 if not self.flow_level:
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bcclaywell
parents:
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586 if self.add_indent(self.column):
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bcclaywell
parents:
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587 mark = self.get_mark()
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bcclaywell
parents:
diff changeset
588 self.tokens.append(BlockMappingStartToken(mark, mark))
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bcclaywell
parents:
diff changeset
589
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bcclaywell
parents:
diff changeset
590 # Simple keys are allowed after ':' in the block context.
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bcclaywell
parents:
diff changeset
591 self.allow_simple_key = not self.flow_level
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bcclaywell
parents:
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592
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bcclaywell
parents:
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593 # Reset possible simple key on the current level.
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bcclaywell
parents:
diff changeset
594 self.remove_possible_simple_key()
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bcclaywell
parents:
diff changeset
595
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bcclaywell
parents:
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596 # Add VALUE.
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bcclaywell
parents:
diff changeset
597 start_mark = self.get_mark()
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bcclaywell
parents:
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598 self.forward()
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parents:
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599 end_mark = self.get_mark()
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parents:
diff changeset
600 self.tokens.append(ValueToken(start_mark, end_mark))
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bcclaywell
parents:
diff changeset
601
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bcclaywell
parents:
diff changeset
602 def fetch_alias(self):
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bcclaywell
parents:
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603
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
604 # ALIAS could be a simple key.
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bcclaywell
parents:
diff changeset
605 self.save_possible_simple_key()
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bcclaywell
parents:
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606
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
607 # No simple keys after ALIAS.
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bcclaywell
parents:
diff changeset
608 self.allow_simple_key = False
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bcclaywell
parents:
diff changeset
609
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
610 # Scan and add ALIAS.
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bcclaywell
parents:
diff changeset
611 self.tokens.append(self.scan_anchor(AliasToken))
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bcclaywell
parents:
diff changeset
612
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bcclaywell
parents:
diff changeset
613 def fetch_anchor(self):
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bcclaywell
parents:
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614
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bcclaywell
parents:
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615 # ANCHOR could start a simple key.
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bcclaywell
parents:
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616 self.save_possible_simple_key()
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parents:
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617
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
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618 # No simple keys after ANCHOR.
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bcclaywell
parents:
diff changeset
619 self.allow_simple_key = False
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bcclaywell
parents:
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620
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
621 # Scan and add ANCHOR.
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bcclaywell
parents:
diff changeset
622 self.tokens.append(self.scan_anchor(AnchorToken))
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parents:
diff changeset
623
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bcclaywell
parents:
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624 def fetch_tag(self):
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bcclaywell
parents:
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625
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
626 # TAG could start a simple key.
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bcclaywell
parents:
diff changeset
627 self.save_possible_simple_key()
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bcclaywell
parents:
diff changeset
628
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bcclaywell
parents:
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629 # No simple keys after TAG.
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bcclaywell
parents:
diff changeset
630 self.allow_simple_key = False
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bcclaywell
parents:
diff changeset
631
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bcclaywell
parents:
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632 # Scan and add TAG.
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bcclaywell
parents:
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633 self.tokens.append(self.scan_tag())
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parents:
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634
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bcclaywell
parents:
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635 def fetch_literal(self):
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bcclaywell
parents:
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636 self.fetch_block_scalar(style='|')
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parents:
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637
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
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638 def fetch_folded(self):
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bcclaywell
parents:
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639 self.fetch_block_scalar(style='>')
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bcclaywell
parents:
diff changeset
640
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
641 def fetch_block_scalar(self, style):
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642
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643 # A simple key may follow a block scalar.
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644 self.allow_simple_key = True
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645
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646 # Reset possible simple key on the current level.
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647 self.remove_possible_simple_key()
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648
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649 # Scan and add SCALAR.
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650 self.tokens.append(self.scan_block_scalar(style))
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651
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652 def fetch_single(self):
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653 self.fetch_flow_scalar(style='\'')
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654
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655 def fetch_double(self):
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656 self.fetch_flow_scalar(style='"')
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657
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658 def fetch_flow_scalar(self, style):
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659
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660 # A flow scalar could be a simple key.
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661 self.save_possible_simple_key()
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662
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663 # No simple keys after flow scalars.
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664 self.allow_simple_key = False
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665
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666 # Scan and add SCALAR.
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667 self.tokens.append(self.scan_flow_scalar(style))
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668
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669 def fetch_plain(self):
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670
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671 # A plain scalar could be a simple key.
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672 self.save_possible_simple_key()
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673
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674 # No simple keys after plain scalars. But note that `scan_plain` will
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675 # change this flag if the scan is finished at the beginning of the
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676 # line.
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677 self.allow_simple_key = False
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678
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679 # Scan and add SCALAR. May change `allow_simple_key`.
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680 self.tokens.append(self.scan_plain())
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681
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682 # Checkers.
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683
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684 def check_directive(self):
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685
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686 # DIRECTIVE: ^ '%' ...
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687 # The '%' indicator is already checked.
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688 if self.column == 0:
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689 return True
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690
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691 def check_document_start(self):
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692
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693 # DOCUMENT-START: ^ '---' (' '|'\n')
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694 if self.column == 0:
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695 if self.prefix(3) == u'---' \
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696 and self.peek(3) in u'\0 \t\r\n\x85\u2028\u2029':
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697 return True
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698
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699 def check_document_end(self):
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700
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701 # DOCUMENT-END: ^ '...' (' '|'\n')
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702 if self.column == 0:
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703 if self.prefix(3) == u'...' \
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704 and self.peek(3) in u'\0 \t\r\n\x85\u2028\u2029':
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705 return True
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706
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707 def check_block_entry(self):
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708
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709 # BLOCK-ENTRY: '-' (' '|'\n')
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710 return self.peek(1) in u'\0 \t\r\n\x85\u2028\u2029'
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711
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712 def check_key(self):
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713
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714 # KEY(flow context): '?'
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parents:
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715 if self.flow_level:
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parents:
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716 return True
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parents:
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717
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718 # KEY(block context): '?' (' '|'\n')
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719 else:
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720 return self.peek(1) in u'\0 \t\r\n\x85\u2028\u2029'
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721
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parents:
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722 def check_value(self):
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parents:
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723
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724 # VALUE(flow context): ':'
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parents:
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725 if self.flow_level:
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bcclaywell
parents:
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726 return True
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parents:
diff changeset
727
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parents:
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728 # VALUE(block context): ':' (' '|'\n')
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parents:
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729 else:
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parents:
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730 return self.peek(1) in u'\0 \t\r\n\x85\u2028\u2029'
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parents:
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731
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parents:
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732 def check_plain(self):
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parents:
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733
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734 # A plain scalar may start with any non-space character except:
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bcclaywell
parents:
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735 # '-', '?', ':', ',', '[', ']', '{', '}',
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bcclaywell
parents:
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736 # '#', '&', '*', '!', '|', '>', '\'', '\"',
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bcclaywell
parents:
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737 # '%', '@', '`'.
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bcclaywell
parents:
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738 #
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parents:
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739 # It may also start with
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bcclaywell
parents:
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740 # '-', '?', ':'
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bcclaywell
parents:
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741 # if it is followed by a non-space character.
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parents:
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742 #
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743 # Note that we limit the last rule to the block context (except the
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
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744 # '-' character) because we want the flow context to be space
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bcclaywell
parents:
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745 # independent.
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parents:
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746 ch = self.peek()
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parents:
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747 return ch not in u'\0 \t\r\n\x85\u2028\u2029-?:,[]{}#&*!|>\'\"%@`' \
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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parents:
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748 or (self.peek(1) not in u'\0 \t\r\n\x85\u2028\u2029'
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parents:
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749 and (ch == u'-' or (not self.flow_level and ch in u'?:')))
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bcclaywell
parents:
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750
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bcclaywell
parents:
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751 # Scanners.
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bcclaywell
parents:
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752
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parents:
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753 def scan_to_next_token(self):
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754 # We ignore spaces, line breaks and comments.
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parents:
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755 # If we find a line break in the block context, we set the flag
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parents:
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756 # `allow_simple_key` on.
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bcclaywell
parents:
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757 # The byte order mark is stripped if it's the first character in the
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parents:
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758 # stream. We do not yet support BOM inside the stream as the
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parents:
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759 # specification requires. Any such mark will be considered as a part
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bcclaywell
parents:
diff changeset
760 # of the document.
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bcclaywell
parents:
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761 #
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762 # TODO: We need to make tab handling rules more sane. A good rule is
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bcclaywell
parents:
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763 # Tabs cannot precede tokens
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bcclaywell
parents:
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764 # BLOCK-SEQUENCE-START, BLOCK-MAPPING-START, BLOCK-END,
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bcclaywell
parents:
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765 # KEY(block), VALUE(block), BLOCK-ENTRY
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parents:
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766 # So the checking code is
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bcclaywell
parents:
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767 # if <TAB>:
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bcclaywell
parents:
diff changeset
768 # self.allow_simple_keys = False
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
769 # We also need to add the check for `allow_simple_keys == True` to
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
770 # `unwind_indent` before issuing BLOCK-END.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
771 # Scanners for block, flow, and plain scalars need to be modified.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
772
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
773 if self.index == 0 and self.peek() == u'\uFEFF':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
774 self.forward()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
775 found = False
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
776 while not found:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
777 while self.peek() == u' ':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
778 self.forward()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
779 if self.peek() == u'#':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
780 while self.peek() not in u'\0\r\n\x85\u2028\u2029':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
781 self.forward()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
782 if self.scan_line_break():
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
783 if not self.flow_level:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
784 self.allow_simple_key = True
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
785 else:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
786 found = True
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
787
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
788 def scan_directive(self):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
789 # See the specification for details.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
790 start_mark = self.get_mark()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
791 self.forward()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
792 name = self.scan_directive_name(start_mark)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
793 value = None
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
794 if name == u'YAML':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
795 value = self.scan_yaml_directive_value(start_mark)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
796 end_mark = self.get_mark()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
797 elif name == u'TAG':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
798 value = self.scan_tag_directive_value(start_mark)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
799 end_mark = self.get_mark()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
800 else:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
801 end_mark = self.get_mark()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
802 while self.peek() not in u'\0\r\n\x85\u2028\u2029':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
803 self.forward()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
804 self.scan_directive_ignored_line(start_mark)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
805 return DirectiveToken(name, value, start_mark, end_mark)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
806
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
807 def scan_directive_name(self, start_mark):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
808 # See the specification for details.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
809 length = 0
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
810 ch = self.peek(length)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
811 while u'0' <= ch <= u'9' or u'A' <= ch <= u'Z' or u'a' <= ch <= u'z' \
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
812 or ch in u'-_':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
813 length += 1
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
814 ch = self.peek(length)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
815 if not length:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
816 raise ScannerError("while scanning a directive", start_mark,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
817 "expected alphabetic or numeric character, but found %r"
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
818 % ch.encode('utf-8'), self.get_mark())
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
819 value = self.prefix(length)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
820 self.forward(length)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
821 ch = self.peek()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
822 if ch not in u'\0 \r\n\x85\u2028\u2029':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
823 raise ScannerError("while scanning a directive", start_mark,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
824 "expected alphabetic or numeric character, but found %r"
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
825 % ch.encode('utf-8'), self.get_mark())
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
826 return value
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
827
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
828 def scan_yaml_directive_value(self, start_mark):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
829 # See the specification for details.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
830 while self.peek() == u' ':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
831 self.forward()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
832 major = self.scan_yaml_directive_number(start_mark)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
833 if self.peek() != '.':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
834 raise ScannerError("while scanning a directive", start_mark,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
835 "expected a digit or '.', but found %r"
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
836 % self.peek().encode('utf-8'),
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
837 self.get_mark())
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
838 self.forward()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
839 minor = self.scan_yaml_directive_number(start_mark)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
840 if self.peek() not in u'\0 \r\n\x85\u2028\u2029':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
841 raise ScannerError("while scanning a directive", start_mark,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
842 "expected a digit or ' ', but found %r"
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
843 % self.peek().encode('utf-8'),
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
844 self.get_mark())
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
845 return (major, minor)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
846
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
847 def scan_yaml_directive_number(self, start_mark):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
848 # See the specification for details.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
849 ch = self.peek()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
850 if not (u'0' <= ch <= u'9'):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
851 raise ScannerError("while scanning a directive", start_mark,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
852 "expected a digit, but found %r" % ch.encode('utf-8'),
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
853 self.get_mark())
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
854 length = 0
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
855 while u'0' <= self.peek(length) <= u'9':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
856 length += 1
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
857 value = int(self.prefix(length))
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
858 self.forward(length)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
859 return value
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
860
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
861 def scan_tag_directive_value(self, start_mark):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
862 # See the specification for details.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
863 while self.peek() == u' ':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
864 self.forward()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
865 handle = self.scan_tag_directive_handle(start_mark)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
866 while self.peek() == u' ':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
867 self.forward()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
868 prefix = self.scan_tag_directive_prefix(start_mark)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
869 return (handle, prefix)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
870
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
871 def scan_tag_directive_handle(self, start_mark):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
872 # See the specification for details.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
873 value = self.scan_tag_handle('directive', start_mark)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
874 ch = self.peek()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
875 if ch != u' ':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
876 raise ScannerError("while scanning a directive", start_mark,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
877 "expected ' ', but found %r" % ch.encode('utf-8'),
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
878 self.get_mark())
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
879 return value
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
880
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
881 def scan_tag_directive_prefix(self, start_mark):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
882 # See the specification for details.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
883 value = self.scan_tag_uri('directive', start_mark)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
884 ch = self.peek()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
885 if ch not in u'\0 \r\n\x85\u2028\u2029':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
886 raise ScannerError("while scanning a directive", start_mark,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
887 "expected ' ', but found %r" % ch.encode('utf-8'),
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
888 self.get_mark())
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
889 return value
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
890
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
891 def scan_directive_ignored_line(self, start_mark):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
892 # See the specification for details.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
893 while self.peek() == u' ':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
894 self.forward()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
895 if self.peek() == u'#':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
896 while self.peek() not in u'\0\r\n\x85\u2028\u2029':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
897 self.forward()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
898 ch = self.peek()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
899 if ch not in u'\0\r\n\x85\u2028\u2029':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
900 raise ScannerError("while scanning a directive", start_mark,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
901 "expected a comment or a line break, but found %r"
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
902 % ch.encode('utf-8'), self.get_mark())
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
903 self.scan_line_break()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
904
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
905 def scan_anchor(self, TokenClass):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
906 # The specification does not restrict characters for anchors and
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
907 # aliases. This may lead to problems, for instance, the document:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
908 # [ *alias, value ]
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
909 # can be interpteted in two ways, as
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
910 # [ "value" ]
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
911 # and
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
912 # [ *alias , "value" ]
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
913 # Therefore we restrict aliases to numbers and ASCII letters.
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bcclaywell
parents:
diff changeset
914 start_mark = self.get_mark()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
915 indicator = self.peek()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
916 if indicator == u'*':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
917 name = 'alias'
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bcclaywell
parents:
diff changeset
918 else:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
919 name = 'anchor'
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bcclaywell
parents:
diff changeset
920 self.forward()
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bcclaywell
parents:
diff changeset
921 length = 0
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bcclaywell
parents:
diff changeset
922 ch = self.peek(length)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
923 while u'0' <= ch <= u'9' or u'A' <= ch <= u'Z' or u'a' <= ch <= u'z' \
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
924 or ch in u'-_':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
925 length += 1
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
926 ch = self.peek(length)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
927 if not length:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
928 raise ScannerError("while scanning an %s" % name, start_mark,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
929 "expected alphabetic or numeric character, but found %r"
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
930 % ch.encode('utf-8'), self.get_mark())
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
931 value = self.prefix(length)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
932 self.forward(length)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
933 ch = self.peek()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
934 if ch not in u'\0 \t\r\n\x85\u2028\u2029?:,]}%@`':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
935 raise ScannerError("while scanning an %s" % name, start_mark,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
936 "expected alphabetic or numeric character, but found %r"
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
937 % ch.encode('utf-8'), self.get_mark())
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
938 end_mark = self.get_mark()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
939 return TokenClass(value, start_mark, end_mark)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
940
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
941 def scan_tag(self):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
942 # See the specification for details.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
943 start_mark = self.get_mark()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
944 ch = self.peek(1)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
945 if ch == u'<':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
946 handle = None
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
947 self.forward(2)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
948 suffix = self.scan_tag_uri('tag', start_mark)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
949 if self.peek() != u'>':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
950 raise ScannerError("while parsing a tag", start_mark,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
951 "expected '>', but found %r" % self.peek().encode('utf-8'),
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
952 self.get_mark())
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
953 self.forward()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
954 elif ch in u'\0 \t\r\n\x85\u2028\u2029':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
955 handle = None
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
956 suffix = u'!'
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
957 self.forward()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
958 else:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
959 length = 1
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
960 use_handle = False
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
961 while ch not in u'\0 \r\n\x85\u2028\u2029':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
962 if ch == u'!':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
963 use_handle = True
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
964 break
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
965 length += 1
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
966 ch = self.peek(length)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
967 handle = u'!'
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
968 if use_handle:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
969 handle = self.scan_tag_handle('tag', start_mark)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
970 else:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
971 handle = u'!'
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
972 self.forward()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
973 suffix = self.scan_tag_uri('tag', start_mark)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
974 ch = self.peek()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
975 if ch not in u'\0 \r\n\x85\u2028\u2029':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
976 raise ScannerError("while scanning a tag", start_mark,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
977 "expected ' ', but found %r" % ch.encode('utf-8'),
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
978 self.get_mark())
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
979 value = (handle, suffix)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
980 end_mark = self.get_mark()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
981 return TagToken(value, start_mark, end_mark)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
982
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
983 def scan_block_scalar(self, style):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
984 # See the specification for details.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
985
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
986 if style == '>':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
987 folded = True
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
988 else:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
989 folded = False
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
990
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
991 chunks = []
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
992 start_mark = self.get_mark()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
993
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
994 # Scan the header.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
995 self.forward()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
996 chomping, increment = self.scan_block_scalar_indicators(start_mark)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
997 self.scan_block_scalar_ignored_line(start_mark)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
998
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
999 # Determine the indentation level and go to the first non-empty line.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1000 min_indent = self.indent+1
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1001 if min_indent < 1:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1002 min_indent = 1
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1003 if increment is None:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1004 breaks, max_indent, end_mark = self.scan_block_scalar_indentation()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1005 indent = max(min_indent, max_indent)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1006 else:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1007 indent = min_indent+increment-1
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1008 breaks, end_mark = self.scan_block_scalar_breaks(indent)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1009 line_break = u''
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1010
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1011 # Scan the inner part of the block scalar.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1012 while self.column == indent and self.peek() != u'\0':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1013 chunks.extend(breaks)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1014 leading_non_space = self.peek() not in u' \t'
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1015 length = 0
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bcclaywell
parents:
diff changeset
1016 while self.peek(length) not in u'\0\r\n\x85\u2028\u2029':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1017 length += 1
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1018 chunks.append(self.prefix(length))
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1019 self.forward(length)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1020 line_break = self.scan_line_break()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1021 breaks, end_mark = self.scan_block_scalar_breaks(indent)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1022 if self.column == indent and self.peek() != u'\0':
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bcclaywell
parents:
diff changeset
1023
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bcclaywell
parents:
diff changeset
1024 # Unfortunately, folding rules are ambiguous.
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bcclaywell
parents:
diff changeset
1025 #
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bcclaywell
parents:
diff changeset
1026 # This is the folding according to the specification:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1027
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bcclaywell
parents:
diff changeset
1028 if folded and line_break == u'\n' \
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1029 and leading_non_space and self.peek() not in u' \t':
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bcclaywell
parents:
diff changeset
1030 if not breaks:
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bcclaywell
parents:
diff changeset
1031 chunks.append(u' ')
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bcclaywell
parents:
diff changeset
1032 else:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1033 chunks.append(line_break)
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bcclaywell
parents:
diff changeset
1034
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bcclaywell
parents:
diff changeset
1035 # This is Clark Evans's interpretation (also in the spec
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bcclaywell
parents:
diff changeset
1036 # examples):
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bcclaywell
parents:
diff changeset
1037 #
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bcclaywell
parents:
diff changeset
1038 #if folded and line_break == u'\n':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1039 # if not breaks:
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bcclaywell
parents:
diff changeset
1040 # if self.peek() not in ' \t':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1041 # chunks.append(u' ')
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bcclaywell
parents:
diff changeset
1042 # else:
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bcclaywell
parents:
diff changeset
1043 # chunks.append(line_break)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1044 #else:
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bcclaywell
parents:
diff changeset
1045 # chunks.append(line_break)
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bcclaywell
parents:
diff changeset
1046 else:
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bcclaywell
parents:
diff changeset
1047 break
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bcclaywell
parents:
diff changeset
1048
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bcclaywell
parents:
diff changeset
1049 # Chomp the tail.
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bcclaywell
parents:
diff changeset
1050 if chomping is not False:
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bcclaywell
parents:
diff changeset
1051 chunks.append(line_break)
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bcclaywell
parents:
diff changeset
1052 if chomping is True:
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bcclaywell
parents:
diff changeset
1053 chunks.extend(breaks)
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bcclaywell
parents:
diff changeset
1054
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bcclaywell
parents:
diff changeset
1055 # We are done.
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bcclaywell
parents:
diff changeset
1056 return ScalarToken(u''.join(chunks), False, start_mark, end_mark,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1057 style)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1058
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1059 def scan_block_scalar_indicators(self, start_mark):
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bcclaywell
parents:
diff changeset
1060 # See the specification for details.
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bcclaywell
parents:
diff changeset
1061 chomping = None
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bcclaywell
parents:
diff changeset
1062 increment = None
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bcclaywell
parents:
diff changeset
1063 ch = self.peek()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1064 if ch in u'+-':
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bcclaywell
parents:
diff changeset
1065 if ch == '+':
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bcclaywell
parents:
diff changeset
1066 chomping = True
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bcclaywell
parents:
diff changeset
1067 else:
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bcclaywell
parents:
diff changeset
1068 chomping = False
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bcclaywell
parents:
diff changeset
1069 self.forward()
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bcclaywell
parents:
diff changeset
1070 ch = self.peek()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1071 if ch in u'0123456789':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1072 increment = int(ch)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1073 if increment == 0:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1074 raise ScannerError("while scanning a block scalar", start_mark,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1075 "expected indentation indicator in the range 1-9, but found 0",
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1076 self.get_mark())
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1077 self.forward()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1078 elif ch in u'0123456789':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1079 increment = int(ch)
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bcclaywell
parents:
diff changeset
1080 if increment == 0:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1081 raise ScannerError("while scanning a block scalar", start_mark,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1082 "expected indentation indicator in the range 1-9, but found 0",
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1083 self.get_mark())
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1084 self.forward()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1085 ch = self.peek()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1086 if ch in u'+-':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1087 if ch == '+':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1088 chomping = True
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1089 else:
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bcclaywell
parents:
diff changeset
1090 chomping = False
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1091 self.forward()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1092 ch = self.peek()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1093 if ch not in u'\0 \r\n\x85\u2028\u2029':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1094 raise ScannerError("while scanning a block scalar", start_mark,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1095 "expected chomping or indentation indicators, but found %r"
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1096 % ch.encode('utf-8'), self.get_mark())
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1097 return chomping, increment
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1098
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1099 def scan_block_scalar_ignored_line(self, start_mark):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1100 # See the specification for details.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1101 while self.peek() == u' ':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1102 self.forward()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1103 if self.peek() == u'#':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1104 while self.peek() not in u'\0\r\n\x85\u2028\u2029':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1105 self.forward()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1106 ch = self.peek()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1107 if ch not in u'\0\r\n\x85\u2028\u2029':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1108 raise ScannerError("while scanning a block scalar", start_mark,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1109 "expected a comment or a line break, but found %r"
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1110 % ch.encode('utf-8'), self.get_mark())
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1111 self.scan_line_break()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1112
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1113 def scan_block_scalar_indentation(self):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1114 # See the specification for details.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1115 chunks = []
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1116 max_indent = 0
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1117 end_mark = self.get_mark()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1118 while self.peek() in u' \r\n\x85\u2028\u2029':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1119 if self.peek() != u' ':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1120 chunks.append(self.scan_line_break())
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1121 end_mark = self.get_mark()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1122 else:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1123 self.forward()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1124 if self.column > max_indent:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1125 max_indent = self.column
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1126 return chunks, max_indent, end_mark
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1127
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1128 def scan_block_scalar_breaks(self, indent):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1129 # See the specification for details.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1130 chunks = []
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1131 end_mark = self.get_mark()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1132 while self.column < indent and self.peek() == u' ':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1133 self.forward()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1134 while self.peek() in u'\r\n\x85\u2028\u2029':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1135 chunks.append(self.scan_line_break())
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1136 end_mark = self.get_mark()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1137 while self.column < indent and self.peek() == u' ':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1138 self.forward()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1139 return chunks, end_mark
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1140
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1141 def scan_flow_scalar(self, style):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1142 # See the specification for details.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1143 # Note that we loose indentation rules for quoted scalars. Quoted
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1144 # scalars don't need to adhere indentation because " and ' clearly
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1145 # mark the beginning and the end of them. Therefore we are less
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1146 # restrictive then the specification requires. We only need to check
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1147 # that document separators are not included in scalars.
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bcclaywell
parents:
diff changeset
1148 if style == '"':
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bcclaywell
parents:
diff changeset
1149 double = True
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bcclaywell
parents:
diff changeset
1150 else:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1151 double = False
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1152 chunks = []
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bcclaywell
parents:
diff changeset
1153 start_mark = self.get_mark()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1154 quote = self.peek()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1155 self.forward()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1156 chunks.extend(self.scan_flow_scalar_non_spaces(double, start_mark))
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1157 while self.peek() != quote:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1158 chunks.extend(self.scan_flow_scalar_spaces(double, start_mark))
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1159 chunks.extend(self.scan_flow_scalar_non_spaces(double, start_mark))
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1160 self.forward()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1161 end_mark = self.get_mark()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1162 return ScalarToken(u''.join(chunks), False, start_mark, end_mark,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1163 style)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1164
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1165 ESCAPE_REPLACEMENTS = {
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1166 u'0': u'\0',
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1167 u'a': u'\x07',
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1168 u'b': u'\x08',
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1169 u't': u'\x09',
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1170 u'\t': u'\x09',
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1171 u'n': u'\x0A',
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1172 u'v': u'\x0B',
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1173 u'f': u'\x0C',
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1174 u'r': u'\x0D',
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1175 u'e': u'\x1B',
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1176 u' ': u'\x20',
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1177 u'\"': u'\"',
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1178 u'\\': u'\\',
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1179 u'N': u'\x85',
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1180 u'_': u'\xA0',
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1181 u'L': u'\u2028',
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1182 u'P': u'\u2029',
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1183 }
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bcclaywell
parents:
diff changeset
1184
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1185 ESCAPE_CODES = {
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1186 u'x': 2,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1187 u'u': 4,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1188 u'U': 8,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1189 }
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1190
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1191 def scan_flow_scalar_non_spaces(self, double, start_mark):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1192 # See the specification for details.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1193 chunks = []
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1194 while True:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1195 length = 0
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1196 while self.peek(length) not in u'\'\"\\\0 \t\r\n\x85\u2028\u2029':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1197 length += 1
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1198 if length:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1199 chunks.append(self.prefix(length))
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1200 self.forward(length)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1201 ch = self.peek()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1202 if not double and ch == u'\'' and self.peek(1) == u'\'':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1203 chunks.append(u'\'')
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1204 self.forward(2)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1205 elif (double and ch == u'\'') or (not double and ch in u'\"\\'):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1206 chunks.append(ch)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1207 self.forward()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1208 elif double and ch == u'\\':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1209 self.forward()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1210 ch = self.peek()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1211 if ch in self.ESCAPE_REPLACEMENTS:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1212 chunks.append(self.ESCAPE_REPLACEMENTS[ch])
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1213 self.forward()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1214 elif ch in self.ESCAPE_CODES:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1215 length = self.ESCAPE_CODES[ch]
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1216 self.forward()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1217 for k in range(length):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1218 if self.peek(k) not in u'0123456789ABCDEFabcdef':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1219 raise ScannerError("while scanning a double-quoted scalar", start_mark,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1220 "expected escape sequence of %d hexdecimal numbers, but found %r" %
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1221 (length, self.peek(k).encode('utf-8')), self.get_mark())
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1222 code = int(self.prefix(length), 16)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1223 chunks.append(unichr(code))
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1224 self.forward(length)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1225 elif ch in u'\r\n\x85\u2028\u2029':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1226 self.scan_line_break()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1227 chunks.extend(self.scan_flow_scalar_breaks(double, start_mark))
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1228 else:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1229 raise ScannerError("while scanning a double-quoted scalar", start_mark,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1230 "found unknown escape character %r" % ch.encode('utf-8'), self.get_mark())
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1231 else:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1232 return chunks
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1233
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1234 def scan_flow_scalar_spaces(self, double, start_mark):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1235 # See the specification for details.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1236 chunks = []
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1237 length = 0
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1238 while self.peek(length) in u' \t':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1239 length += 1
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1240 whitespaces = self.prefix(length)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1241 self.forward(length)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1242 ch = self.peek()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1243 if ch == u'\0':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1244 raise ScannerError("while scanning a quoted scalar", start_mark,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1245 "found unexpected end of stream", self.get_mark())
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1246 elif ch in u'\r\n\x85\u2028\u2029':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1247 line_break = self.scan_line_break()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1248 breaks = self.scan_flow_scalar_breaks(double, start_mark)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1249 if line_break != u'\n':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1250 chunks.append(line_break)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1251 elif not breaks:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1252 chunks.append(u' ')
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1253 chunks.extend(breaks)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1254 else:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1255 chunks.append(whitespaces)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1256 return chunks
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1257
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1258 def scan_flow_scalar_breaks(self, double, start_mark):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1259 # See the specification for details.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1260 chunks = []
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1261 while True:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1262 # Instead of checking indentation, we check for document
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1263 # separators.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1264 prefix = self.prefix(3)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1265 if (prefix == u'---' or prefix == u'...') \
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1266 and self.peek(3) in u'\0 \t\r\n\x85\u2028\u2029':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1267 raise ScannerError("while scanning a quoted scalar", start_mark,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1268 "found unexpected document separator", self.get_mark())
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1269 while self.peek() in u' \t':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1270 self.forward()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1271 if self.peek() in u'\r\n\x85\u2028\u2029':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1272 chunks.append(self.scan_line_break())
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1273 else:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1274 return chunks
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1275
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1276 def scan_plain(self):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1277 # See the specification for details.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1278 # We add an additional restriction for the flow context:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1279 # plain scalars in the flow context cannot contain ',', ':' and '?'.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1280 # We also keep track of the `allow_simple_key` flag here.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1281 # Indentation rules are loosed for the flow context.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1282 chunks = []
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1283 start_mark = self.get_mark()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1284 end_mark = start_mark
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1285 indent = self.indent+1
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1286 # We allow zero indentation for scalars, but then we need to check for
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1287 # document separators at the beginning of the line.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1288 #if indent == 0:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1289 # indent = 1
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1290 spaces = []
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1291 while True:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1292 length = 0
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1293 if self.peek() == u'#':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1294 break
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1295 while True:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1296 ch = self.peek(length)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1297 if ch in u'\0 \t\r\n\x85\u2028\u2029' \
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1298 or (not self.flow_level and ch == u':' and
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1299 self.peek(length+1) in u'\0 \t\r\n\x85\u2028\u2029') \
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1300 or (self.flow_level and ch in u',:?[]{}'):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1301 break
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1302 length += 1
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1303 # It's not clear what we should do with ':' in the flow context.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1304 if (self.flow_level and ch == u':'
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1305 and self.peek(length+1) not in u'\0 \t\r\n\x85\u2028\u2029,[]{}'):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1306 self.forward(length)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1307 raise ScannerError("while scanning a plain scalar", start_mark,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1308 "found unexpected ':'", self.get_mark(),
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1309 "Please check http://pyyaml.org/wiki/YAMLColonInFlowContext for details.")
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1310 if length == 0:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1311 break
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1312 self.allow_simple_key = False
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1313 chunks.extend(spaces)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1314 chunks.append(self.prefix(length))
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1315 self.forward(length)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1316 end_mark = self.get_mark()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1317 spaces = self.scan_plain_spaces(indent, start_mark)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1318 if not spaces or self.peek() == u'#' \
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1319 or (not self.flow_level and self.column < indent):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1320 break
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1321 return ScalarToken(u''.join(chunks), True, start_mark, end_mark)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1322
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1323 def scan_plain_spaces(self, indent, start_mark):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1324 # See the specification for details.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1325 # The specification is really confusing about tabs in plain scalars.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1326 # We just forbid them completely. Do not use tabs in YAML!
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1327 chunks = []
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1328 length = 0
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1329 while self.peek(length) in u' ':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1330 length += 1
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1331 whitespaces = self.prefix(length)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1332 self.forward(length)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1333 ch = self.peek()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1334 if ch in u'\r\n\x85\u2028\u2029':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1335 line_break = self.scan_line_break()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1336 self.allow_simple_key = True
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1337 prefix = self.prefix(3)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1338 if (prefix == u'---' or prefix == u'...') \
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1339 and self.peek(3) in u'\0 \t\r\n\x85\u2028\u2029':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1340 return
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1341 breaks = []
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1342 while self.peek() in u' \r\n\x85\u2028\u2029':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1343 if self.peek() == ' ':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1344 self.forward()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1345 else:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1346 breaks.append(self.scan_line_break())
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1347 prefix = self.prefix(3)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1348 if (prefix == u'---' or prefix == u'...') \
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1349 and self.peek(3) in u'\0 \t\r\n\x85\u2028\u2029':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1350 return
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1351 if line_break != u'\n':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1352 chunks.append(line_break)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1353 elif not breaks:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1354 chunks.append(u' ')
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1355 chunks.extend(breaks)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1356 elif whitespaces:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1357 chunks.append(whitespaces)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1358 return chunks
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1359
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1360 def scan_tag_handle(self, name, start_mark):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1361 # See the specification for details.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1362 # For some strange reasons, the specification does not allow '_' in
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1363 # tag handles. I have allowed it anyway.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1364 ch = self.peek()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1365 if ch != u'!':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1366 raise ScannerError("while scanning a %s" % name, start_mark,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1367 "expected '!', but found %r" % ch.encode('utf-8'),
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1368 self.get_mark())
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1369 length = 1
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1370 ch = self.peek(length)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1371 if ch != u' ':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1372 while u'0' <= ch <= u'9' or u'A' <= ch <= u'Z' or u'a' <= ch <= u'z' \
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1373 or ch in u'-_':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1374 length += 1
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1375 ch = self.peek(length)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1376 if ch != u'!':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1377 self.forward(length)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1378 raise ScannerError("while scanning a %s" % name, start_mark,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1379 "expected '!', but found %r" % ch.encode('utf-8'),
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1380 self.get_mark())
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1381 length += 1
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1382 value = self.prefix(length)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1383 self.forward(length)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1384 return value
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
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1385
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1386 def scan_tag_uri(self, name, start_mark):
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1387 # See the specification for details.
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1388 # Note: we do not check if URI is well-formed.
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1389 chunks = []
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1390 length = 0
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1391 ch = self.peek(length)
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1392 while u'0' <= ch <= u'9' or u'A' <= ch <= u'Z' or u'a' <= ch <= u'z' \
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1393 or ch in u'-;/?:@&=+$,_.!~*\'()[]%':
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1394 if ch == u'%':
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1395 chunks.append(self.prefix(length))
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1396 self.forward(length)
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1397 length = 0
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1398 chunks.append(self.scan_uri_escapes(name, start_mark))
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1399 else:
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1400 length += 1
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1401 ch = self.peek(length)
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1402 if length:
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1403 chunks.append(self.prefix(length))
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1404 self.forward(length)
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1405 length = 0
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1406 if not chunks:
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1407 raise ScannerError("while parsing a %s" % name, start_mark,
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1408 "expected URI, but found %r" % ch.encode('utf-8'),
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1409 self.get_mark())
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1410 return u''.join(chunks)
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1411
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1412 def scan_uri_escapes(self, name, start_mark):
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1413 # See the specification for details.
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1414 bytes = []
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1415 mark = self.get_mark()
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1416 while self.peek() == u'%':
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1417 self.forward()
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1418 for k in range(2):
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1419 if self.peek(k) not in u'0123456789ABCDEFabcdef':
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1420 raise ScannerError("while scanning a %s" % name, start_mark,
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1421 "expected URI escape sequence of 2 hexdecimal numbers, but found %r" %
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1422 (self.peek(k).encode('utf-8')), self.get_mark())
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1423 bytes.append(chr(int(self.prefix(2), 16)))
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1424 self.forward(2)
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1425 try:
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1426 value = unicode(''.join(bytes), 'utf-8')
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1427 except UnicodeDecodeError, exc:
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1428 raise ScannerError("while scanning a %s" % name, start_mark, str(exc), mark)
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1429 return value
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1430
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1431 def scan_line_break(self):
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1432 # Transforms:
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1433 # '\r\n' : '\n'
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1434 # '\r' : '\n'
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1435 # '\n' : '\n'
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1436 # '\x85' : '\n'
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1437 # '\u2028' : '\u2028'
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1438 # '\u2029 : '\u2029'
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1439 # default : ''
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1440 ch = self.peek()
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1441 if ch in u'\r\n\x85':
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1442 if self.prefix(2) == u'\r\n':
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1443 self.forward(2)
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1444 else:
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1445 self.forward()
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1446 return u'\n'
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1447 elif ch in u'\u2028\u2029':
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1448 self.forward()
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1449 return ch
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1450 return u''
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1451
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1452 #try:
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1453 # import psyco
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1454 # psyco.bind(Scanner)
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1455 #except ImportError:
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1456 # pass
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1457