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

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author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
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1 # $Id: statemachine.py 7464 2012-06-25 13:16:03Z milde $
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2 # Author: David Goodger <goodger@python.org>
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3 # Copyright: This module has been placed in the public domain.
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4
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5 """
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6 A finite state machine specialized for regular-expression-based text filters,
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7 this module defines the following classes:
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8
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9 - `StateMachine`, a state machine
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10 - `State`, a state superclass
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11 - `StateMachineWS`, a whitespace-sensitive version of `StateMachine`
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12 - `StateWS`, a state superclass for use with `StateMachineWS`
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13 - `SearchStateMachine`, uses `re.search()` instead of `re.match()`
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14 - `SearchStateMachineWS`, uses `re.search()` instead of `re.match()`
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15 - `ViewList`, extends standard Python lists.
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16 - `StringList`, string-specific ViewList.
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17
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18 Exception classes:
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19
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20 - `StateMachineError`
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21 - `UnknownStateError`
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22 - `DuplicateStateError`
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23 - `UnknownTransitionError`
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24 - `DuplicateTransitionError`
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25 - `TransitionPatternNotFound`
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26 - `TransitionMethodNotFound`
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27 - `UnexpectedIndentationError`
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28 - `TransitionCorrection`: Raised to switch to another transition.
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29 - `StateCorrection`: Raised to switch to another state & transition.
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30
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31 Functions:
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32
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33 - `string2lines()`: split a multi-line string into a list of one-line strings
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34
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35
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36 How To Use This Module
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37 ======================
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38 (See the individual classes, methods, and attributes for details.)
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39
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40 1. Import it: ``import statemachine`` or ``from statemachine import ...``.
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41 You will also need to ``import re``.
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42
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43 2. Derive a subclass of `State` (or `StateWS`) for each state in your state
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44 machine::
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45
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46 class MyState(statemachine.State):
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47
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48 Within the state's class definition:
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49
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50 a) Include a pattern for each transition, in `State.patterns`::
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51
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52 patterns = {'atransition': r'pattern', ...}
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53
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54 b) Include a list of initial transitions to be set up automatically, in
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55 `State.initial_transitions`::
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56
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57 initial_transitions = ['atransition', ...]
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58
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59 c) Define a method for each transition, with the same name as the
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60 transition pattern::
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61
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62 def atransition(self, match, context, next_state):
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63 # do something
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64 result = [...] # a list
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65 return context, next_state, result
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66 # context, next_state may be altered
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67
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68 Transition methods may raise an `EOFError` to cut processing short.
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69
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70 d) You may wish to override the `State.bof()` and/or `State.eof()` implicit
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71 transition methods, which handle the beginning- and end-of-file.
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72
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73 e) In order to handle nested processing, you may wish to override the
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74 attributes `State.nested_sm` and/or `State.nested_sm_kwargs`.
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75
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76 If you are using `StateWS` as a base class, in order to handle nested
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77 indented blocks, you may wish to:
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78
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79 - override the attributes `StateWS.indent_sm`,
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80 `StateWS.indent_sm_kwargs`, `StateWS.known_indent_sm`, and/or
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81 `StateWS.known_indent_sm_kwargs`;
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82 - override the `StateWS.blank()` method; and/or
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83 - override or extend the `StateWS.indent()`, `StateWS.known_indent()`,
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84 and/or `StateWS.firstknown_indent()` methods.
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85
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86 3. Create a state machine object::
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87
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88 sm = StateMachine(state_classes=[MyState, ...],
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89 initial_state='MyState')
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90
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91 4. Obtain the input text, which needs to be converted into a tab-free list of
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92 one-line strings. For example, to read text from a file called
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93 'inputfile'::
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94
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95 input_string = open('inputfile').read()
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96 input_lines = statemachine.string2lines(input_string)
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97
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98 5. Run the state machine on the input text and collect the results, a list::
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99
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100 results = sm.run(input_lines)
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101
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102 6. Remove any lingering circular references::
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103
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104 sm.unlink()
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105 """
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106
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107 __docformat__ = 'restructuredtext'
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108
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109 import sys
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110 import re
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111 import types
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112 import unicodedata
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113 from docutils import utils
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114 from docutils.utils.error_reporting import ErrorOutput
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115
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116
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117 class StateMachine:
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118
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119 """
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120 A finite state machine for text filters using regular expressions.
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121
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122 The input is provided in the form of a list of one-line strings (no
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123 newlines). States are subclasses of the `State` class. Transitions consist
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124 of regular expression patterns and transition methods, and are defined in
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125 each state.
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126
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127 The state machine is started with the `run()` method, which returns the
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128 results of processing in a list.
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129 """
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130
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131 def __init__(self, state_classes, initial_state, debug=False):
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132 """
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133 Initialize a `StateMachine` object; add state objects.
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134
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135 Parameters:
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136
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137 - `state_classes`: a list of `State` (sub)classes.
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138 - `initial_state`: a string, the class name of the initial state.
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139 - `debug`: a boolean; produce verbose output if true (nonzero).
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140 """
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141
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142 self.input_lines = None
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143 """`StringList` of input lines (without newlines).
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144 Filled by `self.run()`."""
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145
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146 self.input_offset = 0
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147 """Offset of `self.input_lines` from the beginning of the file."""
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148
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149 self.line = None
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150 """Current input line."""
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151
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152 self.line_offset = -1
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153 """Current input line offset from beginning of `self.input_lines`."""
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154
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155 self.debug = debug
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156 """Debugging mode on/off."""
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157
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158 self.initial_state = initial_state
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159 """The name of the initial state (key to `self.states`)."""
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160
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161 self.current_state = initial_state
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162 """The name of the current state (key to `self.states`)."""
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163
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164 self.states = {}
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165 """Mapping of {state_name: State_object}."""
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166
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167 self.add_states(state_classes)
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168
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169 self.observers = []
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170 """List of bound methods or functions to call whenever the current
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171 line changes. Observers are called with one argument, ``self``.
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172 Cleared at the end of `run()`."""
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173
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174 self._stderr = ErrorOutput()
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175 """Wrapper around sys.stderr catching en-/decoding errors"""
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176
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177
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178 def unlink(self):
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179 """Remove circular references to objects no longer required."""
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180 for state in self.states.values():
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181 state.unlink()
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182 self.states = None
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183
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184 def run(self, input_lines, input_offset=0, context=None,
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185 input_source=None, initial_state=None):
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186 """
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187 Run the state machine on `input_lines`. Return results (a list).
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188
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189 Reset `self.line_offset` and `self.current_state`. Run the
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190 beginning-of-file transition. Input one line at a time and check for a
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191 matching transition. If a match is found, call the transition method
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192 and possibly change the state. Store the context returned by the
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193 transition method to be passed on to the next transition matched.
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194 Accumulate the results returned by the transition methods in a list.
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195 Run the end-of-file transition. Finally, return the accumulated
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196 results.
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197
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198 Parameters:
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199
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200 - `input_lines`: a list of strings without newlines, or `StringList`.
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201 - `input_offset`: the line offset of `input_lines` from the beginning
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202 of the file.
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203 - `context`: application-specific storage.
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204 - `input_source`: name or path of source of `input_lines`.
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205 - `initial_state`: name of initial state.
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206 """
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207 self.runtime_init()
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208 if isinstance(input_lines, StringList):
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209 self.input_lines = input_lines
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210 else:
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211 self.input_lines = StringList(input_lines, source=input_source)
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212 self.input_offset = input_offset
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213 self.line_offset = -1
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214 self.current_state = initial_state or self.initial_state
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215 if self.debug:
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216 print >>self._stderr, (
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217 u'\nStateMachine.run: input_lines (line_offset=%s):\n| %s'
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218 % (self.line_offset, u'\n| '.join(self.input_lines)))
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219 transitions = None
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220 results = []
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221 state = self.get_state()
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222 try:
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223 if self.debug:
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224 print >>self._stderr, '\nStateMachine.run: bof transition'
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225 context, result = state.bof(context)
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226 results.extend(result)
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227 while True:
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228 try:
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229 try:
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230 self.next_line()
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231 if self.debug:
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232 source, offset = self.input_lines.info(
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233 self.line_offset)
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234 print >>self._stderr, (
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235 u'\nStateMachine.run: line (source=%r, '
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236 u'offset=%r):\n| %s'
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237 % (source, offset, self.line))
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238 context, next_state, result = self.check_line(
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239 context, state, transitions)
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240 except EOFError:
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241 if self.debug:
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242 print >>self._stderr, (
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243 '\nStateMachine.run: %s.eof transition'
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244 % state.__class__.__name__)
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245 result = state.eof(context)
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246 results.extend(result)
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247 break
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248 else:
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249 results.extend(result)
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250 except TransitionCorrection, exception:
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251 self.previous_line() # back up for another try
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252 transitions = (exception.args[0],)
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253 if self.debug:
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254 print >>self._stderr, (
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255 '\nStateMachine.run: TransitionCorrection to '
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256 'state "%s", transition %s.'
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257 % (state.__class__.__name__, transitions[0]))
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258 continue
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259 except StateCorrection, exception:
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260 self.previous_line() # back up for another try
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261 next_state = exception.args[0]
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262 if len(exception.args) == 1:
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263 transitions = None
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264 else:
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265 transitions = (exception.args[1],)
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266 if self.debug:
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267 print >>self._stderr, (
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268 '\nStateMachine.run: StateCorrection to state '
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269 '"%s", transition %s.'
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270 % (next_state, transitions[0]))
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271 else:
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272 transitions = None
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273 state = self.get_state(next_state)
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274 except:
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275 if self.debug:
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276 self.error()
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277 raise
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278 self.observers = []
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279 return results
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280
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281 def get_state(self, next_state=None):
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282 """
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283 Return current state object; set it first if `next_state` given.
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284
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285 Parameter `next_state`: a string, the name of the next state.
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286
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287 Exception: `UnknownStateError` raised if `next_state` unknown.
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288 """
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289 if next_state:
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290 if self.debug and next_state != self.current_state:
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291 print >>self._stderr, (
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292 '\nStateMachine.get_state: Changing state from '
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293 '"%s" to "%s" (input line %s).'
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294 % (self.current_state, next_state,
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295 self.abs_line_number()))
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296 self.current_state = next_state
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297 try:
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298 return self.states[self.current_state]
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299 except KeyError:
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300 raise UnknownStateError(self.current_state)
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301
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302 def next_line(self, n=1):
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303 """Load `self.line` with the `n`'th next line and return it."""
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304 try:
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305 try:
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306 self.line_offset += n
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307 self.line = self.input_lines[self.line_offset]
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308 except IndexError:
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309 self.line = None
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310 raise EOFError
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311 return self.line
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312 finally:
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313 self.notify_observers()
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314
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315 def is_next_line_blank(self):
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316 """Return 1 if the next line is blank or non-existant."""
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317 try:
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318 return not self.input_lines[self.line_offset + 1].strip()
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319 except IndexError:
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320 return 1
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321
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322 def at_eof(self):
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323 """Return 1 if the input is at or past end-of-file."""
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324 return self.line_offset >= len(self.input_lines) - 1
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325
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326 def at_bof(self):
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327 """Return 1 if the input is at or before beginning-of-file."""
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328 return self.line_offset <= 0
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329
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330 def previous_line(self, n=1):
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331 """Load `self.line` with the `n`'th previous line and return it."""
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332 self.line_offset -= n
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333 if self.line_offset < 0:
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334 self.line = None
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335 else:
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336 self.line = self.input_lines[self.line_offset]
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337 self.notify_observers()
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338 return self.line
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339
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340 def goto_line(self, line_offset):
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341 """Jump to absolute line offset `line_offset`, load and return it."""
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342 try:
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343 try:
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344 self.line_offset = line_offset - self.input_offset
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345 self.line = self.input_lines[self.line_offset]
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346 except IndexError:
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347 self.line = None
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348 raise EOFError
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349 return self.line
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350 finally:
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351 self.notify_observers()
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352
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353 def get_source(self, line_offset):
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354 """Return source of line at absolute line offset `line_offset`."""
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355 return self.input_lines.source(line_offset - self.input_offset)
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356
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357 def abs_line_offset(self):
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358 """Return line offset of current line, from beginning of file."""
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359 return self.line_offset + self.input_offset
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360
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361 def abs_line_number(self):
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362 """Return line number of current line (counting from 1)."""
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363 return self.line_offset + self.input_offset + 1
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364
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365 def get_source_and_line(self, lineno=None):
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366 """Return (source, line) tuple for current or given line number.
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367
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368 Looks up the source and line number in the `self.input_lines`
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369 StringList instance to count for included source files.
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370
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371 If the optional argument `lineno` is given, convert it from an
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372 absolute line number to the corresponding (source, line) pair.
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373 """
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374 if lineno is None:
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375 offset = self.line_offset
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376 else:
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377 offset = lineno - self.input_offset - 1
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378 try:
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379 src, srcoffset = self.input_lines.info(offset)
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380 srcline = srcoffset + 1
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381 except (TypeError):
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382 # line is None if index is "Just past the end"
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383 src, srcline = self.get_source_and_line(offset + self.input_offset)
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384 return src, srcline + 1
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385 except (IndexError): # `offset` is off the list
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386 src, srcline = None, None
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387 # raise AssertionError('cannot find line %d in %s lines' %
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388 # (offset, len(self.input_lines)))
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389 # # list(self.input_lines.lines())))
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390 # assert offset == srcoffset, str(self.input_lines)
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391 # print "get_source_and_line(%s):" % lineno,
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392 # print offset + 1, '->', src, srcline
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393 # print self.input_lines
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394 return (src, srcline)
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395
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396 def insert_input(self, input_lines, source):
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397 self.input_lines.insert(self.line_offset + 1, '',
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398 source='internal padding after '+source,
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399 offset=len(input_lines))
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400 self.input_lines.insert(self.line_offset + 1, '',
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401 source='internal padding before '+source,
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402 offset=-1)
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403 self.input_lines.insert(self.line_offset + 2,
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404 StringList(input_lines, source))
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405
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406 def get_text_block(self, flush_left=False):
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407 """
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408 Return a contiguous block of text.
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409
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410 If `flush_left` is true, raise `UnexpectedIndentationError` if an
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411 indented line is encountered before the text block ends (with a blank
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412 line).
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413 """
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414 try:
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415 block = self.input_lines.get_text_block(self.line_offset,
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416 flush_left)
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417 self.next_line(len(block) - 1)
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418 return block
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419 except UnexpectedIndentationError, err:
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420 block = err.args[0]
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421 self.next_line(len(block) - 1) # advance to last line of block
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422 raise
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423
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424 def check_line(self, context, state, transitions=None):
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425 """
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426 Examine one line of input for a transition match & execute its method.
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427
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428 Parameters:
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429
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430 - `context`: application-dependent storage.
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431 - `state`: a `State` object, the current state.
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432 - `transitions`: an optional ordered list of transition names to try,
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433 instead of ``state.transition_order``.
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434
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435 Return the values returned by the transition method:
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436
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437 - context: possibly modified from the parameter `context`;
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438 - next state name (`State` subclass name);
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439 - the result output of the transition, a list.
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440
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441 When there is no match, ``state.no_match()`` is called and its return
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442 value is returned.
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443 """
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444 if transitions is None:
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445 transitions = state.transition_order
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446 state_correction = None
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447 if self.debug:
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448 print >>self._stderr, (
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449 '\nStateMachine.check_line: state="%s", transitions=%r.'
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450 % (state.__class__.__name__, transitions))
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451 for name in transitions:
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452 pattern, method, next_state = state.transitions[name]
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453 match = pattern.match(self.line)
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454 if match:
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455 if self.debug:
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456 print >>self._stderr, (
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457 '\nStateMachine.check_line: Matched transition '
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458 '"%s" in state "%s".'
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459 % (name, state.__class__.__name__))
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460 return method(match, context, next_state)
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461 else:
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462 if self.debug:
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463 print >>self._stderr, (
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464 '\nStateMachine.check_line: No match in state "%s".'
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465 % state.__class__.__name__)
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466 return state.no_match(context, transitions)
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467
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468 def add_state(self, state_class):
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469 """
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470 Initialize & add a `state_class` (`State` subclass) object.
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471
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472 Exception: `DuplicateStateError` raised if `state_class` was already
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473 added.
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474 """
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475 statename = state_class.__name__
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476 if statename in self.states:
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477 raise DuplicateStateError(statename)
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478 self.states[statename] = state_class(self, self.debug)
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479
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480 def add_states(self, state_classes):
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481 """
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482 Add `state_classes` (a list of `State` subclasses).
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483 """
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484 for state_class in state_classes:
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485 self.add_state(state_class)
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486
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487 def runtime_init(self):
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488 """
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489 Initialize `self.states`.
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490 """
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491 for state in self.states.values():
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492 state.runtime_init()
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493
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494 def error(self):
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495 """Report error details."""
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496 type, value, module, line, function = _exception_data()
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497 print >>self._stderr, u'%s: %s' % (type, value)
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498 print >>self._stderr, 'input line %s' % (self.abs_line_number())
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499 print >>self._stderr, (u'module %s, line %s, function %s' %
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500 (module, line, function))
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501
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502 def attach_observer(self, observer):
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503 """
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504 The `observer` parameter is a function or bound method which takes two
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505 arguments, the source and offset of the current line.
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506 """
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507 self.observers.append(observer)
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508
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509 def detach_observer(self, observer):
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510 self.observers.remove(observer)
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511
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512 def notify_observers(self):
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513 for observer in self.observers:
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514 try:
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515 info = self.input_lines.info(self.line_offset)
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516 except IndexError:
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517 info = (None, None)
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518 observer(*info)
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519
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520
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521 class State:
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522
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523 """
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524 State superclass. Contains a list of transitions, and transition methods.
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525
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526 Transition methods all have the same signature. They take 3 parameters:
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527
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528 - An `re` match object. ``match.string`` contains the matched input line,
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529 ``match.start()`` gives the start index of the match, and
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530 ``match.end()`` gives the end index.
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531 - A context object, whose meaning is application-defined (initial value
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532 ``None``). It can be used to store any information required by the state
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533 machine, and the retured context is passed on to the next transition
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534 method unchanged.
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535 - The name of the next state, a string, taken from the transitions list;
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536 normally it is returned unchanged, but it may be altered by the
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537 transition method if necessary.
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538
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539 Transition methods all return a 3-tuple:
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540
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541 - A context object, as (potentially) modified by the transition method.
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542 - The next state name (a return value of ``None`` means no state change).
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543 - The processing result, a list, which is accumulated by the state
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544 machine.
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545
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546 Transition methods may raise an `EOFError` to cut processing short.
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547
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548 There are two implicit transitions, and corresponding transition methods
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549 are defined: `bof()` handles the beginning-of-file, and `eof()` handles
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550 the end-of-file. These methods have non-standard signatures and return
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551 values. `bof()` returns the initial context and results, and may be used
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552 to return a header string, or do any other processing needed. `eof()`
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553 should handle any remaining context and wrap things up; it returns the
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554 final processing result.
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555
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556 Typical applications need only subclass `State` (or a subclass), set the
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557 `patterns` and `initial_transitions` class attributes, and provide
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558 corresponding transition methods. The default object initialization will
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559 take care of constructing the list of transitions.
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560 """
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561
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562 patterns = None
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563 """
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564 {Name: pattern} mapping, used by `make_transition()`. Each pattern may
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565 be a string or a compiled `re` pattern. Override in subclasses.
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566 """
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567
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568 initial_transitions = None
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569 """
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570 A list of transitions to initialize when a `State` is instantiated.
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571 Each entry is either a transition name string, or a (transition name, next
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572 state name) pair. See `make_transitions()`. Override in subclasses.
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573 """
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574
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575 nested_sm = None
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576 """
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577 The `StateMachine` class for handling nested processing.
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578
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579 If left as ``None``, `nested_sm` defaults to the class of the state's
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580 controlling state machine. Override it in subclasses to avoid the default.
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581 """
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582
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583 nested_sm_kwargs = None
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584 """
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585 Keyword arguments dictionary, passed to the `nested_sm` constructor.
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586
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587 Two keys must have entries in the dictionary:
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588
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589 - Key 'state_classes' must be set to a list of `State` classes.
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590 - Key 'initial_state' must be set to the name of the initial state class.
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591
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592 If `nested_sm_kwargs` is left as ``None``, 'state_classes' defaults to the
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593 class of the current state, and 'initial_state' defaults to the name of
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594 the class of the current state. Override in subclasses to avoid the
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595 defaults.
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596 """
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597
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598 def __init__(self, state_machine, debug=False):
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599 """
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600 Initialize a `State` object; make & add initial transitions.
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601
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602 Parameters:
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603
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604 - `statemachine`: the controlling `StateMachine` object.
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605 - `debug`: a boolean; produce verbose output if true.
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606 """
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607
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608 self.transition_order = []
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609 """A list of transition names in search order."""
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610
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611 self.transitions = {}
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612 """
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613 A mapping of transition names to 3-tuples containing
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614 (compiled_pattern, transition_method, next_state_name). Initialized as
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615 an instance attribute dynamically (instead of as a class attribute)
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616 because it may make forward references to patterns and methods in this
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617 or other classes.
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618 """
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619
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620 self.add_initial_transitions()
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621
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622 self.state_machine = state_machine
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623 """A reference to the controlling `StateMachine` object."""
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624
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625 self.debug = debug
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626 """Debugging mode on/off."""
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627
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628 if self.nested_sm is None:
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629 self.nested_sm = self.state_machine.__class__
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630 if self.nested_sm_kwargs is None:
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631 self.nested_sm_kwargs = {'state_classes': [self.__class__],
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632 'initial_state': self.__class__.__name__}
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633
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634 def runtime_init(self):
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635 """
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636 Initialize this `State` before running the state machine; called from
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637 `self.state_machine.run()`.
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638 """
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639 pass
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640
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641 def unlink(self):
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642 """Remove circular references to objects no longer required."""
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643 self.state_machine = None
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644
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645 def add_initial_transitions(self):
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646 """Make and add transitions listed in `self.initial_transitions`."""
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647 if self.initial_transitions:
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648 names, transitions = self.make_transitions(
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649 self.initial_transitions)
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650 self.add_transitions(names, transitions)
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651
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652 def add_transitions(self, names, transitions):
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653 """
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654 Add a list of transitions to the start of the transition list.
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655
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656 Parameters:
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657
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658 - `names`: a list of transition names.
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659 - `transitions`: a mapping of names to transition tuples.
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660
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661 Exceptions: `DuplicateTransitionError`, `UnknownTransitionError`.
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662 """
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663 for name in names:
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664 if name in self.transitions:
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665 raise DuplicateTransitionError(name)
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666 if name not in transitions:
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667 raise UnknownTransitionError(name)
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668 self.transition_order[:0] = names
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669 self.transitions.update(transitions)
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670
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671 def add_transition(self, name, transition):
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672 """
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673 Add a transition to the start of the transition list.
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674
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675 Parameter `transition`: a ready-made transition 3-tuple.
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676
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677 Exception: `DuplicateTransitionError`.
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678 """
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679 if name in self.transitions:
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680 raise DuplicateTransitionError(name)
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681 self.transition_order[:0] = [name]
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682 self.transitions[name] = transition
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683
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684 def remove_transition(self, name):
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685 """
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686 Remove a transition by `name`.
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687
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688 Exception: `UnknownTransitionError`.
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689 """
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690 try:
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691 del self.transitions[name]
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692 self.transition_order.remove(name)
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693 except:
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694 raise UnknownTransitionError(name)
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695
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696 def make_transition(self, name, next_state=None):
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697 """
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698 Make & return a transition tuple based on `name`.
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699
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700 This is a convenience function to simplify transition creation.
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701
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702 Parameters:
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703
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704 - `name`: a string, the name of the transition pattern & method. This
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705 `State` object must have a method called '`name`', and a dictionary
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706 `self.patterns` containing a key '`name`'.
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707 - `next_state`: a string, the name of the next `State` object for this
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708 transition. A value of ``None`` (or absent) implies no state change
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709 (i.e., continue with the same state).
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710
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711 Exceptions: `TransitionPatternNotFound`, `TransitionMethodNotFound`.
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712 """
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713 if next_state is None:
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714 next_state = self.__class__.__name__
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715 try:
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716 pattern = self.patterns[name]
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717 if not hasattr(pattern, 'match'):
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718 pattern = re.compile(pattern)
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719 except KeyError:
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720 raise TransitionPatternNotFound(
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721 '%s.patterns[%r]' % (self.__class__.__name__, name))
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722 try:
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723 method = getattr(self, name)
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724 except AttributeError:
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725 raise TransitionMethodNotFound(
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726 '%s.%s' % (self.__class__.__name__, name))
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727 return (pattern, method, next_state)
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728
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729 def make_transitions(self, name_list):
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730 """
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731 Return a list of transition names and a transition mapping.
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732
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733 Parameter `name_list`: a list, where each entry is either a transition
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734 name string, or a 1- or 2-tuple (transition name, optional next state
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735 name).
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736 """
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737 stringtype = type('')
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738 names = []
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739 transitions = {}
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740 for namestate in name_list:
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741 if type(namestate) is stringtype:
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742 transitions[namestate] = self.make_transition(namestate)
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743 names.append(namestate)
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744 else:
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745 transitions[namestate[0]] = self.make_transition(*namestate)
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746 names.append(namestate[0])
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747 return names, transitions
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748
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749 def no_match(self, context, transitions):
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750 """
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751 Called when there is no match from `StateMachine.check_line()`.
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752
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753 Return the same values returned by transition methods:
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754
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755 - context: unchanged;
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756 - next state name: ``None``;
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parents:
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757 - empty result list.
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758
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759 Override in subclasses to catch this event.
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760 """
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761 return context, None, []
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762
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763 def bof(self, context):
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764 """
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765 Handle beginning-of-file. Return unchanged `context`, empty result.
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766
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767 Override in subclasses.
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768
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769 Parameter `context`: application-defined storage.
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770 """
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771 return context, []
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772
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773 def eof(self, context):
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774 """
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775 Handle end-of-file. Return empty result.
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776
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777 Override in subclasses.
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778
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779 Parameter `context`: application-defined storage.
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780 """
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781 return []
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782
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783 def nop(self, match, context, next_state):
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784 """
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785 A "do nothing" transition method.
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786
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787 Return unchanged `context` & `next_state`, empty result. Useful for
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788 simple state changes (actionless transitions).
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789 """
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790 return context, next_state, []
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791
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792
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793 class StateMachineWS(StateMachine):
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794
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795 """
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796 `StateMachine` subclass specialized for whitespace recognition.
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797
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798 There are three methods provided for extracting indented text blocks:
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799
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800 - `get_indented()`: use when the indent is unknown.
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801 - `get_known_indented()`: use when the indent is known for all lines.
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802 - `get_first_known_indented()`: use when only the first line's indent is
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803 known.
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804 """
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805
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806 def get_indented(self, until_blank=False, strip_indent=True):
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807 """
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808 Return a block of indented lines of text, and info.
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809
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810 Extract an indented block where the indent is unknown for all lines.
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811
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812 :Parameters:
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813 - `until_blank`: Stop collecting at the first blank line if true.
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814 - `strip_indent`: Strip common leading indent if true (default).
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815
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816 :Return:
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817 - the indented block (a list of lines of text),
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818 - its indent,
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819 - its first line offset from BOF, and
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820 - whether or not it finished with a blank line.
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821 """
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822 offset = self.abs_line_offset()
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823 indented, indent, blank_finish = self.input_lines.get_indented(
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824 self.line_offset, until_blank, strip_indent)
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825 if indented:
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826 self.next_line(len(indented) - 1) # advance to last indented line
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827 while indented and not indented[0].strip():
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828 indented.trim_start()
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829 offset += 1
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830 return indented, indent, offset, blank_finish
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831
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832 def get_known_indented(self, indent, until_blank=False, strip_indent=True):
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833 """
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834 Return an indented block and info.
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835
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836 Extract an indented block where the indent is known for all lines.
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837 Starting with the current line, extract the entire text block with at
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838 least `indent` indentation (which must be whitespace, except for the
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839 first line).
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840
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841 :Parameters:
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842 - `indent`: The number of indent columns/characters.
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843 - `until_blank`: Stop collecting at the first blank line if true.
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844 - `strip_indent`: Strip `indent` characters of indentation if true
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845 (default).
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846
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847 :Return:
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848 - the indented block,
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849 - its first line offset from BOF, and
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850 - whether or not it finished with a blank line.
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851 """
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852 offset = self.abs_line_offset()
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853 indented, indent, blank_finish = self.input_lines.get_indented(
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854 self.line_offset, until_blank, strip_indent,
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855 block_indent=indent)
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856 self.next_line(len(indented) - 1) # advance to last indented line
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857 while indented and not indented[0].strip():
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858 indented.trim_start()
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859 offset += 1
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860 return indented, offset, blank_finish
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861
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862 def get_first_known_indented(self, indent, until_blank=False,
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863 strip_indent=True, strip_top=True):
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864 """
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865 Return an indented block and info.
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866
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867 Extract an indented block where the indent is known for the first line
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868 and unknown for all other lines.
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869
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870 :Parameters:
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871 - `indent`: The first line's indent (# of columns/characters).
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872 - `until_blank`: Stop collecting at the first blank line if true
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873 (1).
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874 - `strip_indent`: Strip `indent` characters of indentation if true
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875 (1, default).
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876 - `strip_top`: Strip blank lines from the beginning of the block.
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877
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878 :Return:
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879 - the indented block,
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880 - its indent,
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881 - its first line offset from BOF, and
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882 - whether or not it finished with a blank line.
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883 """
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884 offset = self.abs_line_offset()
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885 indented, indent, blank_finish = self.input_lines.get_indented(
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886 self.line_offset, until_blank, strip_indent,
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887 first_indent=indent)
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888 self.next_line(len(indented) - 1) # advance to last indented line
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889 if strip_top:
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890 while indented and not indented[0].strip():
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891 indented.trim_start()
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892 offset += 1
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893 return indented, indent, offset, blank_finish
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894
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895
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896 class StateWS(State):
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897
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898 """
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899 State superclass specialized for whitespace (blank lines & indents).
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900
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901 Use this class with `StateMachineWS`. The transitions 'blank' (for blank
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902 lines) and 'indent' (for indented text blocks) are added automatically,
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903 before any other transitions. The transition method `blank()` handles
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904 blank lines and `indent()` handles nested indented blocks. Indented
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905 blocks trigger a new state machine to be created by `indent()` and run.
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906 The class of the state machine to be created is in `indent_sm`, and the
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907 constructor keyword arguments are in the dictionary `indent_sm_kwargs`.
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908
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909 The methods `known_indent()` and `firstknown_indent()` are provided for
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910 indented blocks where the indent (all lines' and first line's only,
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911 respectively) is known to the transition method, along with the attributes
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912 `known_indent_sm` and `known_indent_sm_kwargs`. Neither transition method
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913 is triggered automatically.
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914 """
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915
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916 indent_sm = None
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917 """
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918 The `StateMachine` class handling indented text blocks.
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919
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920 If left as ``None``, `indent_sm` defaults to the value of
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921 `State.nested_sm`. Override it in subclasses to avoid the default.
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922 """
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923
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924 indent_sm_kwargs = None
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925 """
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926 Keyword arguments dictionary, passed to the `indent_sm` constructor.
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927
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928 If left as ``None``, `indent_sm_kwargs` defaults to the value of
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929 `State.nested_sm_kwargs`. Override it in subclasses to avoid the default.
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930 """
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931
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932 known_indent_sm = None
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933 """
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934 The `StateMachine` class handling known-indented text blocks.
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935
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936 If left as ``None``, `known_indent_sm` defaults to the value of
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937 `indent_sm`. Override it in subclasses to avoid the default.
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938 """
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939
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940 known_indent_sm_kwargs = None
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941 """
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942 Keyword arguments dictionary, passed to the `known_indent_sm` constructor.
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943
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944 If left as ``None``, `known_indent_sm_kwargs` defaults to the value of
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945 `indent_sm_kwargs`. Override it in subclasses to avoid the default.
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946 """
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947
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948 ws_patterns = {'blank': ' *$',
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949 'indent': ' +'}
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950 """Patterns for default whitespace transitions. May be overridden in
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951 subclasses."""
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952
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953 ws_initial_transitions = ('blank', 'indent')
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954 """Default initial whitespace transitions, added before those listed in
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955 `State.initial_transitions`. May be overridden in subclasses."""
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956
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957 def __init__(self, state_machine, debug=False):
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958 """
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959 Initialize a `StateSM` object; extends `State.__init__()`.
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960
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961 Check for indent state machine attributes, set defaults if not set.
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962 """
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963 State.__init__(self, state_machine, debug)
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964 if self.indent_sm is None:
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965 self.indent_sm = self.nested_sm
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966 if self.indent_sm_kwargs is None:
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967 self.indent_sm_kwargs = self.nested_sm_kwargs
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968 if self.known_indent_sm is None:
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969 self.known_indent_sm = self.indent_sm
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970 if self.known_indent_sm_kwargs is None:
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971 self.known_indent_sm_kwargs = self.indent_sm_kwargs
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972
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973 def add_initial_transitions(self):
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974 """
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975 Add whitespace-specific transitions before those defined in subclass.
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976
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977 Extends `State.add_initial_transitions()`.
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978 """
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979 State.add_initial_transitions(self)
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980 if self.patterns is None:
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981 self.patterns = {}
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982 self.patterns.update(self.ws_patterns)
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983 names, transitions = self.make_transitions(
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984 self.ws_initial_transitions)
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985 self.add_transitions(names, transitions)
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986
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987 def blank(self, match, context, next_state):
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988 """Handle blank lines. Does nothing. Override in subclasses."""
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989 return self.nop(match, context, next_state)
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990
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991 def indent(self, match, context, next_state):
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992 """
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993 Handle an indented text block. Extend or override in subclasses.
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994
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995 Recursively run the registered state machine for indented blocks
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996 (`self.indent_sm`).
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997 """
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998 indented, indent, line_offset, blank_finish = \
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999 self.state_machine.get_indented()
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1000 sm = self.indent_sm(debug=self.debug, **self.indent_sm_kwargs)
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1001 results = sm.run(indented, input_offset=line_offset)
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1002 return context, next_state, results
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1003
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1004 def known_indent(self, match, context, next_state):
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1005 """
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1006 Handle a known-indent text block. Extend or override in subclasses.
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1007
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1008 Recursively run the registered state machine for known-indent indented
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1009 blocks (`self.known_indent_sm`). The indent is the length of the
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1010 match, ``match.end()``.
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1011 """
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1012 indented, line_offset, blank_finish = \
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1013 self.state_machine.get_known_indented(match.end())
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1014 sm = self.known_indent_sm(debug=self.debug,
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1015 **self.known_indent_sm_kwargs)
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1016 results = sm.run(indented, input_offset=line_offset)
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1017 return context, next_state, results
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1018
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1019 def first_known_indent(self, match, context, next_state):
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1020 """
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1021 Handle an indented text block (first line's indent known).
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1022
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1023 Extend or override in subclasses.
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1024
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1025 Recursively run the registered state machine for known-indent indented
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1026 blocks (`self.known_indent_sm`). The indent is the length of the
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1027 match, ``match.end()``.
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1028 """
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1029 indented, line_offset, blank_finish = \
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1030 self.state_machine.get_first_known_indented(match.end())
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1031 sm = self.known_indent_sm(debug=self.debug,
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1032 **self.known_indent_sm_kwargs)
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1033 results = sm.run(indented, input_offset=line_offset)
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1034 return context, next_state, results
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1035
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1036
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1037 class _SearchOverride:
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1038
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1039 """
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1040 Mix-in class to override `StateMachine` regular expression behavior.
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1041
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1042 Changes regular expression matching, from the default `re.match()`
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1043 (succeeds only if the pattern matches at the start of `self.line`) to
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1044 `re.search()` (succeeds if the pattern matches anywhere in `self.line`).
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1045 When subclassing a `StateMachine`, list this class **first** in the
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1046 inheritance list of the class definition.
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1047 """
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1048
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1049 def match(self, pattern):
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1050 """
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1051 Return the result of a regular expression search.
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1052
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1053 Overrides `StateMachine.match()`.
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1054
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1055 Parameter `pattern`: `re` compiled regular expression.
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1056 """
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1057 return pattern.search(self.line)
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1058
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1059
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1060 class SearchStateMachine(_SearchOverride, StateMachine):
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1061 """`StateMachine` which uses `re.search()` instead of `re.match()`."""
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1062 pass
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1063
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1064
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1065 class SearchStateMachineWS(_SearchOverride, StateMachineWS):
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1066 """`StateMachineWS` which uses `re.search()` instead of `re.match()`."""
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1067 pass
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1068
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1069
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1070 class ViewList:
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1071
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1072 """
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1073 List with extended functionality: slices of ViewList objects are child
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1074 lists, linked to their parents. Changes made to a child list also affect
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1075 the parent list. A child list is effectively a "view" (in the SQL sense)
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1076 of the parent list. Changes to parent lists, however, do *not* affect
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1077 active child lists. If a parent list is changed, any active child lists
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1078 should be recreated.
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1079
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1080 The start and end of the slice can be trimmed using the `trim_start()` and
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1081 `trim_end()` methods, without affecting the parent list. The link between
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1082 child and parent lists can be broken by calling `disconnect()` on the
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1083 child list.
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1084
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1085 Also, ViewList objects keep track of the source & offset of each item.
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1086 This information is accessible via the `source()`, `offset()`, and
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1087 `info()` methods.
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1088 """
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1089
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1090 def __init__(self, initlist=None, source=None, items=None,
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1091 parent=None, parent_offset=None):
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1092 self.data = []
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1093 """The actual list of data, flattened from various sources."""
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1094
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1095 self.items = []
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1096 """A list of (source, offset) pairs, same length as `self.data`: the
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1097 source of each line and the offset of each line from the beginning of
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1098 its source."""
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1099
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1100 self.parent = parent
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1101 """The parent list."""
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1102
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1103 self.parent_offset = parent_offset
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1104 """Offset of this list from the beginning of the parent list."""
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1105
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1106 if isinstance(initlist, ViewList):
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1107 self.data = initlist.data[:]
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1108 self.items = initlist.items[:]
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1109 elif initlist is not None:
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1110 self.data = list(initlist)
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1111 if items:
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1112 self.items = items
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1113 else:
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1114 self.items = [(source, i) for i in range(len(initlist))]
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1115 assert len(self.data) == len(self.items), 'data mismatch'
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1116
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1117 def __str__(self):
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1118 return str(self.data)
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1119
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1120 def __repr__(self):
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1121 return '%s(%s, items=%s)' % (self.__class__.__name__,
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1122 self.data, self.items)
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1123
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1124 def __lt__(self, other): return self.data < self.__cast(other)
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1125 def __le__(self, other): return self.data <= self.__cast(other)
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1126 def __eq__(self, other): return self.data == self.__cast(other)
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1127 def __ne__(self, other): return self.data != self.__cast(other)
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1128 def __gt__(self, other): return self.data > self.__cast(other)
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1129 def __ge__(self, other): return self.data >= self.__cast(other)
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1130 def __cmp__(self, other): return cmp(self.data, self.__cast(other))
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1131
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1132 def __cast(self, other):
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1133 if isinstance(other, ViewList):
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1134 return other.data
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1135 else:
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1136 return other
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1137
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1138 def __contains__(self, item): return item in self.data
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1139 def __len__(self): return len(self.data)
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1140
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1141 # The __getitem__()/__setitem__() methods check whether the index
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1142 # is a slice first, since indexing a native list with a slice object
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1143 # just works.
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1144
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diff changeset
1145 def __getitem__(self, i):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1146 if isinstance(i, types.SliceType):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1147 assert i.step in (None, 1), 'cannot handle slice with stride'
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1148 return self.__class__(self.data[i.start:i.stop],
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1149 items=self.items[i.start:i.stop],
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1150 parent=self, parent_offset=i.start or 0)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1151 else:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1152 return self.data[i]
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1153
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1154 def __setitem__(self, i, item):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1155 if isinstance(i, types.SliceType):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1156 assert i.step in (None, 1), 'cannot handle slice with stride'
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1157 if not isinstance(item, ViewList):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1158 raise TypeError('assigning non-ViewList to ViewList slice')
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1159 self.data[i.start:i.stop] = item.data
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1160 self.items[i.start:i.stop] = item.items
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1161 assert len(self.data) == len(self.items), 'data mismatch'
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1162 if self.parent:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1163 self.parent[(i.start or 0) + self.parent_offset
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1164 : (i.stop or len(self)) + self.parent_offset] = item
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1165 else:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1166 self.data[i] = item
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1167 if self.parent:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1168 self.parent[i + self.parent_offset] = item
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1169
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1170 def __delitem__(self, i):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1171 try:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1172 del self.data[i]
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1173 del self.items[i]
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1174 if self.parent:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1175 del self.parent[i + self.parent_offset]
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1176 except TypeError:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1177 assert i.step is None, 'cannot handle slice with stride'
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1178 del self.data[i.start:i.stop]
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1179 del self.items[i.start:i.stop]
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1180 if self.parent:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1181 del self.parent[(i.start or 0) + self.parent_offset
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1182 : (i.stop or len(self)) + self.parent_offset]
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1183
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1184 def __add__(self, other):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1185 if isinstance(other, ViewList):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1186 return self.__class__(self.data + other.data,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1187 items=(self.items + other.items))
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1188 else:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1189 raise TypeError('adding non-ViewList to a ViewList')
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1190
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1191 def __radd__(self, other):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1192 if isinstance(other, ViewList):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1193 return self.__class__(other.data + self.data,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1194 items=(other.items + self.items))
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1195 else:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1196 raise TypeError('adding ViewList to a non-ViewList')
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1197
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1198 def __iadd__(self, other):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1199 if isinstance(other, ViewList):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1200 self.data += other.data
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1201 else:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1202 raise TypeError('argument to += must be a ViewList')
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1203 return self
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1204
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1205 def __mul__(self, n):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1206 return self.__class__(self.data * n, items=(self.items * n))
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1207
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1208 __rmul__ = __mul__
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1209
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1210 def __imul__(self, n):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1211 self.data *= n
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1212 self.items *= n
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1213 return self
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1214
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1215 def extend(self, other):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1216 if not isinstance(other, ViewList):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1217 raise TypeError('extending a ViewList with a non-ViewList')
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1218 if self.parent:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1219 self.parent.insert(len(self.data) + self.parent_offset, other)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1220 self.data.extend(other.data)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1221 self.items.extend(other.items)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1222
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1223 def append(self, item, source=None, offset=0):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1224 if source is None:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1225 self.extend(item)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1226 else:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1227 if self.parent:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1228 self.parent.insert(len(self.data) + self.parent_offset, item,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1229 source, offset)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1230 self.data.append(item)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1231 self.items.append((source, offset))
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1232
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1233 def insert(self, i, item, source=None, offset=0):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1234 if source is None:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1235 if not isinstance(item, ViewList):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1236 raise TypeError('inserting non-ViewList with no source given')
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1237 self.data[i:i] = item.data
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1238 self.items[i:i] = item.items
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1239 if self.parent:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1240 index = (len(self.data) + i) % len(self.data)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1241 self.parent.insert(index + self.parent_offset, item)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1242 else:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1243 self.data.insert(i, item)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1244 self.items.insert(i, (source, offset))
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1245 if self.parent:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1246 index = (len(self.data) + i) % len(self.data)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1247 self.parent.insert(index + self.parent_offset, item,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1248 source, offset)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1249
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1250 def pop(self, i=-1):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1251 if self.parent:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1252 index = (len(self.data) + i) % len(self.data)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1253 self.parent.pop(index + self.parent_offset)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1254 self.items.pop(i)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1255 return self.data.pop(i)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1256
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1257 def trim_start(self, n=1):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1258 """
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1259 Remove items from the start of the list, without touching the parent.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1260 """
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1261 if n > len(self.data):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1262 raise IndexError("Size of trim too large; can't trim %s items "
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1263 "from a list of size %s." % (n, len(self.data)))
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1264 elif n < 0:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1265 raise IndexError('Trim size must be >= 0.')
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1266 del self.data[:n]
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1267 del self.items[:n]
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1268 if self.parent:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1269 self.parent_offset += n
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bcclaywell
parents:
diff changeset
1270
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1271 def trim_end(self, n=1):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1272 """
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1273 Remove items from the end of the list, without touching the parent.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1274 """
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1275 if n > len(self.data):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1276 raise IndexError("Size of trim too large; can't trim %s items "
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1277 "from a list of size %s." % (n, len(self.data)))
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1278 elif n < 0:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1279 raise IndexError('Trim size must be >= 0.')
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1280 del self.data[-n:]
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1281 del self.items[-n:]
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1282
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1283 def remove(self, item):
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bcclaywell
parents:
diff changeset
1284 index = self.index(item)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1285 del self[index]
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bcclaywell
parents:
diff changeset
1286
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bcclaywell
parents:
diff changeset
1287 def count(self, item): return self.data.count(item)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1288 def index(self, item): return self.data.index(item)
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bcclaywell
parents:
diff changeset
1289
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bcclaywell
parents:
diff changeset
1290 def reverse(self):
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bcclaywell
parents:
diff changeset
1291 self.data.reverse()
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bcclaywell
parents:
diff changeset
1292 self.items.reverse()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1293 self.parent = None
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bcclaywell
parents:
diff changeset
1294
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bcclaywell
parents:
diff changeset
1295 def sort(self, *args):
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bcclaywell
parents:
diff changeset
1296 tmp = zip(self.data, self.items)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1297 tmp.sort(*args)
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bcclaywell
parents:
diff changeset
1298 self.data = [entry[0] for entry in tmp]
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1299 self.items = [entry[1] for entry in tmp]
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bcclaywell
parents:
diff changeset
1300 self.parent = None
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bcclaywell
parents:
diff changeset
1301
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1302 def info(self, i):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1303 """Return source & offset for index `i`."""
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1304 try:
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bcclaywell
parents:
diff changeset
1305 return self.items[i]
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1306 except IndexError:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1307 if i == len(self.data): # Just past the end
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1308 return self.items[i - 1][0], None
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1309 else:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1310 raise
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1311
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1312 def source(self, i):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1313 """Return source for index `i`."""
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1314 return self.info(i)[0]
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1315
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bcclaywell
parents:
diff changeset
1316 def offset(self, i):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1317 """Return offset for index `i`."""
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1318 return self.info(i)[1]
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1319
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1320 def disconnect(self):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1321 """Break link between this list and parent list."""
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1322 self.parent = None
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1323
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1324 def xitems(self):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1325 """Return iterator yielding (source, offset, value) tuples."""
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1326 for (value, (source, offset)) in zip(self.data, self.items):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1327 yield (source, offset, value)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1328
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1329 def pprint(self):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1330 """Print the list in `grep` format (`source:offset:value` lines)"""
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1331 for line in self.xitems():
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1332 print "%s:%d:%s" % line
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1333
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1334
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1335 class StringList(ViewList):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1336
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1337 """A `ViewList` with string-specific methods."""
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1338
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1339 def trim_left(self, length, start=0, end=sys.maxint):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1340 """
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1341 Trim `length` characters off the beginning of each item, in-place,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1342 from index `start` to `end`. No whitespace-checking is done on the
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1343 trimmed text. Does not affect slice parent.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1344 """
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1345 self.data[start:end] = [line[length:]
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1346 for line in self.data[start:end]]
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1347
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1348 def get_text_block(self, start, flush_left=False):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1349 """
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1350 Return a contiguous block of text.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1351
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1352 If `flush_left` is true, raise `UnexpectedIndentationError` if an
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1353 indented line is encountered before the text block ends (with a blank
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1354 line).
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1355 """
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1356 end = start
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1357 last = len(self.data)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1358 while end < last:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1359 line = self.data[end]
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1360 if not line.strip():
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1361 break
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1362 if flush_left and (line[0] == ' '):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1363 source, offset = self.info(end)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1364 raise UnexpectedIndentationError(self[start:end], source,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1365 offset + 1)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1366 end += 1
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1367 return self[start:end]
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1368
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1369 def get_indented(self, start=0, until_blank=False, strip_indent=True,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1370 block_indent=None, first_indent=None):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1371 """
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1372 Extract and return a StringList of indented lines of text.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1373
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1374 Collect all lines with indentation, determine the minimum indentation,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1375 remove the minimum indentation from all indented lines (unless
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1376 `strip_indent` is false), and return them. All lines up to but not
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1377 including the first unindented line will be returned.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1378
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1379 :Parameters:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1380 - `start`: The index of the first line to examine.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1381 - `until_blank`: Stop collecting at the first blank line if true.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1382 - `strip_indent`: Strip common leading indent if true (default).
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1383 - `block_indent`: The indent of the entire block, if known.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1384 - `first_indent`: The indent of the first line, if known.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1385
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1386 :Return:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1387 - a StringList of indented lines with mininum indent removed;
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1388 - the amount of the indent;
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1389 - a boolean: did the indented block finish with a blank line or EOF?
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1390 """
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1391 indent = block_indent # start with None if unknown
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1392 end = start
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1393 if block_indent is not None and first_indent is None:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1394 first_indent = block_indent
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1395 if first_indent is not None:
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bcclaywell
parents:
diff changeset
1396 end += 1
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1397 last = len(self.data)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1398 while end < last:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1399 line = self.data[end]
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1400 if line and (line[0] != ' '
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bcclaywell
parents:
diff changeset
1401 or (block_indent is not None
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1402 and line[:block_indent].strip())):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1403 # Line not indented or insufficiently indented.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1404 # Block finished properly iff the last indented line blank:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1405 blank_finish = ((end > start)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1406 and not self.data[end - 1].strip())
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bcclaywell
parents:
diff changeset
1407 break
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bcclaywell
parents:
diff changeset
1408 stripped = line.lstrip()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1409 if not stripped: # blank line
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bcclaywell
parents:
diff changeset
1410 if until_blank:
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bcclaywell
parents:
diff changeset
1411 blank_finish = 1
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1412 break
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bcclaywell
parents:
diff changeset
1413 elif block_indent is None:
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bcclaywell
parents:
diff changeset
1414 line_indent = len(line) - len(stripped)
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bcclaywell
parents:
diff changeset
1415 if indent is None:
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bcclaywell
parents:
diff changeset
1416 indent = line_indent
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bcclaywell
parents:
diff changeset
1417 else:
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bcclaywell
parents:
diff changeset
1418 indent = min(indent, line_indent)
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bcclaywell
parents:
diff changeset
1419 end += 1
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bcclaywell
parents:
diff changeset
1420 else:
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bcclaywell
parents:
diff changeset
1421 blank_finish = 1 # block ends at end of lines
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bcclaywell
parents:
diff changeset
1422 block = self[start:end]
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1423 if first_indent is not None and block:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1424 block.data[0] = block.data[0][first_indent:]
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1425 if indent and strip_indent:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1426 block.trim_left(indent, start=(first_indent is not None))
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1427 return block, indent or 0, blank_finish
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bcclaywell
parents:
diff changeset
1428
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bcclaywell
parents:
diff changeset
1429 def get_2D_block(self, top, left, bottom, right, strip_indent=True):
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bcclaywell
parents:
diff changeset
1430 block = self[top:bottom]
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bcclaywell
parents:
diff changeset
1431 indent = right
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bcclaywell
parents:
diff changeset
1432 for i in range(len(block.data)):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1433 # get slice from line, care for combining characters
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1434 ci = utils.column_indices(block.data[i])
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1435 try:
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bcclaywell
parents:
diff changeset
1436 left = ci[left]
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1437 except IndexError:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1438 left += len(block.data[i]) - len(ci)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1439 try:
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bcclaywell
parents:
diff changeset
1440 right = ci[right]
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1441 except IndexError:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1442 right += len(block.data[i]) - len(ci)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1443 block.data[i] = line = block.data[i][left:right].rstrip()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1444 if line:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1445 indent = min(indent, len(line) - len(line.lstrip()))
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1446 if strip_indent and 0 < indent < right:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1447 block.data = [line[indent:] for line in block.data]
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1448 return block
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1449
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1450 def pad_double_width(self, pad_char):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1451 """
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1452 Pad all double-width characters in self by appending `pad_char` to each.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1453 For East Asian language support.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1454 """
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1455 if hasattr(unicodedata, 'east_asian_width'):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1456 east_asian_width = unicodedata.east_asian_width
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1457 else:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1458 return # new in Python 2.4
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1459 for i in range(len(self.data)):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1460 line = self.data[i]
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1461 if isinstance(line, unicode):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1462 new = []
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1463 for char in line:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1464 new.append(char)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1465 if east_asian_width(char) in 'WF': # 'W'ide & 'F'ull-width
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1466 new.append(pad_char)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1467 self.data[i] = ''.join(new)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1468
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1469 def replace(self, old, new):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1470 """Replace all occurrences of substring `old` with `new`."""
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1471 for i in range(len(self.data)):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1472 self.data[i] = self.data[i].replace(old, new)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1473
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1474
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1475 class StateMachineError(Exception): pass
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1476 class UnknownStateError(StateMachineError): pass
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1477 class DuplicateStateError(StateMachineError): pass
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1478 class UnknownTransitionError(StateMachineError): pass
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1479 class DuplicateTransitionError(StateMachineError): pass
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1480 class TransitionPatternNotFound(StateMachineError): pass
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1481 class TransitionMethodNotFound(StateMachineError): pass
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1482 class UnexpectedIndentationError(StateMachineError): pass
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1483
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1484
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1485 class TransitionCorrection(Exception):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1486
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1487 """
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1488 Raise from within a transition method to switch to another transition.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1489
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1490 Raise with one argument, the new transition name.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1491 """
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1492
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1493
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1494 class StateCorrection(Exception):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1495
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1496 """
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1497 Raise from within a transition method to switch to another state.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1498
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1499 Raise with one or two arguments: new state name, and an optional new
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1500 transition name.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1501 """
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1502
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1503
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1504 def string2lines(astring, tab_width=8, convert_whitespace=False,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1505 whitespace=re.compile('[\v\f]')):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1506 """
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1507 Return a list of one-line strings with tabs expanded, no newlines, and
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1508 trailing whitespace stripped.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1509
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1510 Each tab is expanded with between 1 and `tab_width` spaces, so that the
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1511 next character's index becomes a multiple of `tab_width` (8 by default).
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1512
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1513 Parameters:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1514
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1515 - `astring`: a multi-line string.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1516 - `tab_width`: the number of columns between tab stops.
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1517 - `convert_whitespace`: convert form feeds and vertical tabs to spaces?
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1518 """
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1519 if convert_whitespace:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
1520 astring = whitespace.sub(' ', astring)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
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1521 return [s.expandtabs(tab_width).rstrip() for s in astring.splitlines()]
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1522
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1523 def _exception_data():
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1524 """
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1525 Return exception information:
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1526
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1527 - the exception's class name;
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1528 - the exception object;
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1529 - the name of the file containing the offending code;
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1530 - the line number of the offending code;
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1531 - the function name of the offending code.
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1532 """
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1533 type, value, traceback = sys.exc_info()
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1534 while traceback.tb_next:
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1535 traceback = traceback.tb_next
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1536 code = traceback.tb_frame.f_code
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1537 return (type.__name__, value, code.co_filename, traceback.tb_lineno,
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1538 code.co_name)