Mercurial > repos > bcclaywell > argo_navis

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

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planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
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1
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2 from error import *
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3
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4 from tokens import *
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5 from events import *
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6 from nodes import *
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7
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8 from loader import *
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9 from dumper import *
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10
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11 __version__ = '3.11'
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12
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13 try:
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14 from cyaml import *
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15 __with_libyaml__ = True
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16 except ImportError:
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17 __with_libyaml__ = False
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18
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19 def scan(stream, Loader=Loader):
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20 """
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21 Scan a YAML stream and produce scanning tokens.
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22 """
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23 loader = Loader(stream)
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24 try:
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25 while loader.check_token():
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26 yield loader.get_token()
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27 finally:
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28 loader.dispose()
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29
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30 def parse(stream, Loader=Loader):
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31 """
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32 Parse a YAML stream and produce parsing events.
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33 """
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34 loader = Loader(stream)
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35 try:
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36 while loader.check_event():
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37 yield loader.get_event()
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38 finally:
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39 loader.dispose()
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40
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41 def compose(stream, Loader=Loader):
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42 """
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43 Parse the first YAML document in a stream
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44 and produce the corresponding representation tree.
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45 """
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46 loader = Loader(stream)
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47 try:
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48 return loader.get_single_node()
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49 finally:
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50 loader.dispose()
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51
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52 def compose_all(stream, Loader=Loader):
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53 """
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54 Parse all YAML documents in a stream
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55 and produce corresponding representation trees.
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56 """
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57 loader = Loader(stream)
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58 try:
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59 while loader.check_node():
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60 yield loader.get_node()
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61 finally:
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62 loader.dispose()
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63
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64 def load(stream, Loader=Loader):
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65 """
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66 Parse the first YAML document in a stream
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67 and produce the corresponding Python object.
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68 """
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69 loader = Loader(stream)
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70 try:
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71 return loader.get_single_data()
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72 finally:
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73 loader.dispose()
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74
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75 def load_all(stream, Loader=Loader):
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76 """
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77 Parse all YAML documents in a stream
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78 and produce corresponding Python objects.
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79 """
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80 loader = Loader(stream)
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81 try:
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82 while loader.check_data():
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83 yield loader.get_data()
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84 finally:
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85 loader.dispose()
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86
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87 def safe_load(stream):
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88 """
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89 Parse the first YAML document in a stream
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90 and produce the corresponding Python object.
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91 Resolve only basic YAML tags.
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92 """
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93 return load(stream, SafeLoader)
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94
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95 def safe_load_all(stream):
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96 """
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97 Parse all YAML documents in a stream
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98 and produce corresponding Python objects.
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99 Resolve only basic YAML tags.
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100 """
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101 return load_all(stream, SafeLoader)
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102
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103 def emit(events, stream=None, Dumper=Dumper,
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104 canonical=None, indent=None, width=None,
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105 allow_unicode=None, line_break=None):
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106 """
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107 Emit YAML parsing events into a stream.
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108 If stream is None, return the produced string instead.
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109 """
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110 getvalue = None
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111 if stream is None:
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112 from StringIO import StringIO
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113 stream = StringIO()
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114 getvalue = stream.getvalue
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115 dumper = Dumper(stream, canonical=canonical, indent=indent, width=width,
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116 allow_unicode=allow_unicode, line_break=line_break)
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117 try:
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118 for event in events:
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119 dumper.emit(event)
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120 finally:
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121 dumper.dispose()
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122 if getvalue:
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123 return getvalue()
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124
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125 def serialize_all(nodes, stream=None, Dumper=Dumper,
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126 canonical=None, indent=None, width=None,
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127 allow_unicode=None, line_break=None,
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128 encoding='utf-8', explicit_start=None, explicit_end=None,
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129 version=None, tags=None):
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130 """
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131 Serialize a sequence of representation trees into a YAML stream.
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132 If stream is None, return the produced string instead.
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133 """
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134 getvalue = None
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135 if stream is None:
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136 if encoding is None:
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137 from StringIO import StringIO
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138 else:
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139 from cStringIO import StringIO
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140 stream = StringIO()
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141 getvalue = stream.getvalue
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142 dumper = Dumper(stream, canonical=canonical, indent=indent, width=width,
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143 allow_unicode=allow_unicode, line_break=line_break,
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144 encoding=encoding, version=version, tags=tags,
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145 explicit_start=explicit_start, explicit_end=explicit_end)
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146 try:
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147 dumper.open()
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148 for node in nodes:
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149 dumper.serialize(node)
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150 dumper.close()
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151 finally:
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152 dumper.dispose()
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153 if getvalue:
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154 return getvalue()
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155
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156 def serialize(node, stream=None, Dumper=Dumper, **kwds):
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157 """
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158 Serialize a representation tree into a YAML stream.
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159 If stream is None, return the produced string instead.
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160 """
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161 return serialize_all([node], stream, Dumper=Dumper, **kwds)
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162
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163 def dump_all(documents, stream=None, Dumper=Dumper,
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164 default_style=None, default_flow_style=None,
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165 canonical=None, indent=None, width=None,
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166 allow_unicode=None, line_break=None,
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167 encoding='utf-8', explicit_start=None, explicit_end=None,
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168 version=None, tags=None):
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169 """
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170 Serialize a sequence of Python objects into a YAML stream.
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171 If stream is None, return the produced string instead.
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172 """
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173 getvalue = None
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174 if stream is None:
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175 if encoding is None:
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176 from StringIO import StringIO
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177 else:
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178 from cStringIO import StringIO
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179 stream = StringIO()
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180 getvalue = stream.getvalue
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181 dumper = Dumper(stream, default_style=default_style,
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182 default_flow_style=default_flow_style,
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183 canonical=canonical, indent=indent, width=width,
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184 allow_unicode=allow_unicode, line_break=line_break,
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185 encoding=encoding, version=version, tags=tags,
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186 explicit_start=explicit_start, explicit_end=explicit_end)
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187 try:
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188 dumper.open()
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189 for data in documents:
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190 dumper.represent(data)
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191 dumper.close()
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192 finally:
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193 dumper.dispose()
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194 if getvalue:
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195 return getvalue()
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196
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197 def dump(data, stream=None, Dumper=Dumper, **kwds):
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198 """
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199 Serialize a Python object into a YAML stream.
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200 If stream is None, return the produced string instead.
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201 """
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202 return dump_all([data], stream, Dumper=Dumper, **kwds)
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203
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204 def safe_dump_all(documents, stream=None, **kwds):
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205 """
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206 Serialize a sequence of Python objects into a YAML stream.
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207 Produce only basic YAML tags.
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208 If stream is None, return the produced string instead.
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209 """
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210 return dump_all(documents, stream, Dumper=SafeDumper, **kwds)
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211
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212 def safe_dump(data, stream=None, **kwds):
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213 """
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214 Serialize a Python object into a YAML stream.
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215 Produce only basic YAML tags.
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216 If stream is None, return the produced string instead.
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217 """
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218 return dump_all([data], stream, Dumper=SafeDumper, **kwds)
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219
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220 def add_implicit_resolver(tag, regexp, first=None,
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221 Loader=Loader, Dumper=Dumper):
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222 """
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223 Add an implicit scalar detector.
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224 If an implicit scalar value matches the given regexp,
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225 the corresponding tag is assigned to the scalar.
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226 first is a sequence of possible initial characters or None.
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227 """
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228 Loader.add_implicit_resolver(tag, regexp, first)
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229 Dumper.add_implicit_resolver(tag, regexp, first)
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230
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231 def add_path_resolver(tag, path, kind=None, Loader=Loader, Dumper=Dumper):
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232 """
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233 Add a path based resolver for the given tag.
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234 A path is a list of keys that forms a path
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235 to a node in the representation tree.
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236 Keys can be string values, integers, or None.
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237 """
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238 Loader.add_path_resolver(tag, path, kind)
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239 Dumper.add_path_resolver(tag, path, kind)
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240
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241 def add_constructor(tag, constructor, Loader=Loader):
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242 """
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243 Add a constructor for the given tag.
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244 Constructor is a function that accepts a Loader instance
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245 and a node object and produces the corresponding Python object.
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246 """
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247 Loader.add_constructor(tag, constructor)
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248
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249 def add_multi_constructor(tag_prefix, multi_constructor, Loader=Loader):
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250 """
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251 Add a multi-constructor for the given tag prefix.
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252 Multi-constructor is called for a node if its tag starts with tag_prefix.
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253 Multi-constructor accepts a Loader instance, a tag suffix,
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254 and a node object and produces the corresponding Python object.
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255 """
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256 Loader.add_multi_constructor(tag_prefix, multi_constructor)
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257
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258 def add_representer(data_type, representer, Dumper=Dumper):
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259 """
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260 Add a representer for the given type.
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261 Representer is a function accepting a Dumper instance
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262 and an instance of the given data type
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263 and producing the corresponding representation node.
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264 """
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265 Dumper.add_representer(data_type, representer)
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266
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267 def add_multi_representer(data_type, multi_representer, Dumper=Dumper):
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268 """
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269 Add a representer for the given type.
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270 Multi-representer is a function accepting a Dumper instance
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271 and an instance of the given data type or subtype
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272 and producing the corresponding representation node.
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273 """
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274 Dumper.add_multi_representer(data_type, multi_representer)
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275
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276 class YAMLObjectMetaclass(type):
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277 """
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278 The metaclass for YAMLObject.
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279 """
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280 def __init__(cls, name, bases, kwds):
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281 super(YAMLObjectMetaclass, cls).__init__(name, bases, kwds)
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282 if 'yaml_tag' in kwds and kwds['yaml_tag'] is not None:
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283 cls.yaml_loader.add_constructor(cls.yaml_tag, cls.from_yaml)
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284 cls.yaml_dumper.add_representer(cls, cls.to_yaml)
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285
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286 class YAMLObject(object):
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287 """
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288 An object that can dump itself to a YAML stream
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289 and load itself from a YAML stream.
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290 """
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291
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292 __metaclass__ = YAMLObjectMetaclass
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293 __slots__ = () # no direct instantiation, so allow immutable subclasses
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294
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295 yaml_loader = Loader
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296 yaml_dumper = Dumper
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297
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298 yaml_tag = None
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299 yaml_flow_style = None
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300
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301 def from_yaml(cls, loader, node):
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302 """
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303 Convert a representation node to a Python object.
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304 """
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305 return loader.construct_yaml_object(node, cls)
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306 from_yaml = classmethod(from_yaml)
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307
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308 def to_yaml(cls, dumper, data):
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309 """
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310 Convert a Python object to a representation node.
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311 """
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312 return dumper.represent_yaml_object(cls.yaml_tag, data, cls,
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313 flow_style=cls.yaml_flow_style)
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314 to_yaml = classmethod(to_yaml)
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315