Mercurial > repos > bcclaywell > argo_navis

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

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planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
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1 #!/usr/bin/python
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2 # coding: utf-8
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3
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4 """Lexical analysis of formal languages (i.e. code) using Pygments."""
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5
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6 # :Author: Georg Brandl; Felix Wiemann; Günter Milde
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7 # :Date: $Date: 2011-12-20 15:14:21 +0100 (Die, 20. Dez 2011) $
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8 # :Copyright: This module has been placed in the public domain.
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9
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10 from docutils import ApplicationError
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11 try:
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12 import pygments
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13 from pygments.lexers import get_lexer_by_name
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14 from pygments.formatters.html import _get_ttype_class
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15 with_pygments = True
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16 except ImportError:
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17 with_pygments = False
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18
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19 # Filter the following token types from the list of class arguments:
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20 unstyled_tokens = ['token', # Token (base token type)
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21 'text', # Token.Text
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22 ''] # short name for Token and Text
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23 # (Add, e.g., Token.Punctuation with ``unstyled_tokens += 'punctuation'``.)
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24
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25 class LexerError(ApplicationError):
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26 pass
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27
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28 class Lexer(object):
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29 """Parse `code` lines and yield "classified" tokens.
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30
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31 Arguments
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32
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33 code -- string of source code to parse,
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34 language -- formal language the code is written in,
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35 tokennames -- either 'long', 'short', or '' (see below).
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36
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37 Merge subsequent tokens of the same token-type.
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38
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39 Iterating over an instance yields the tokens as ``(tokentype, value)``
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40 tuples. The value of `tokennames` configures the naming of the tokentype:
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41
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42 'long': downcased full token type name,
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43 'short': short name defined by pygments.token.STANDARD_TYPES
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44 (= class argument used in pygments html output),
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45 'none': skip lexical analysis.
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46 """
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47
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48 def __init__(self, code, language, tokennames='short'):
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49 """
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50 Set up a lexical analyzer for `code` in `language`.
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51 """
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52 self.code = code
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53 self.language = language
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54 self.tokennames = tokennames
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55 self.lexer = None
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56 # get lexical analyzer for `language`:
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57 if language in ('', 'text') or tokennames == 'none':
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58 return
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59 if not with_pygments:
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60 raise LexerError('Cannot analyze code. '
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61 'Pygments package not found.')
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62 try:
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63 self.lexer = get_lexer_by_name(self.language)
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64 except pygments.util.ClassNotFound:
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65 raise LexerError('Cannot analyze code. '
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66 'No Pygments lexer found for "%s".' % language)
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67
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68 # Since version 1.2. (released Jan 01, 2010) Pygments has a
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69 # TokenMergeFilter. However, this requires Python >= 2.4. When Docutils
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70 # requires same minimal version, ``self.merge(tokens)`` in __iter__ can
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71 # be replaced by ``self.lexer.add_filter('tokenmerge')`` in __init__.
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72 def merge(self, tokens):
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73 """Merge subsequent tokens of same token-type.
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74
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75 Also strip the final newline (added by pygments).
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76 """
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77 tokens = iter(tokens)
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78 (lasttype, lastval) = tokens.next()
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79 for ttype, value in tokens:
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80 if ttype is lasttype:
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81 lastval += value
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82 else:
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83 yield(lasttype, lastval)
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84 (lasttype, lastval) = (ttype, value)
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85 if lastval.endswith('\n'):
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86 lastval = lastval[:-1]
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87 if lastval:
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88 yield(lasttype, lastval)
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89
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90 def __iter__(self):
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91 """Parse self.code and yield "classified" tokens.
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92 """
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93 if self.lexer is None:
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94 yield ([], self.code)
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95 return
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96 tokens = pygments.lex(self.code, self.lexer)
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97 for tokentype, value in self.merge(tokens):
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98 if self.tokennames == 'long': # long CSS class args
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99 classes = str(tokentype).lower().split('.')
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100 else: # short CSS class args
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101 classes = [_get_ttype_class(tokentype)]
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102 classes = [cls for cls in classes if cls not in unstyled_tokens]
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103 yield (classes, value)
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104
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105
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106 class NumberLines(object):
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107 """Insert linenumber-tokens at the start of every code line.
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108
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109 Arguments
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110
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111 tokens -- iterable of ``(classes, value)`` tuples
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112 startline -- first line number
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113 endline -- last line number
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114
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115 Iterating over an instance yields the tokens with a
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116 ``(['ln'], '<the line number>')`` token added for every code line.
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117 Multi-line tokens are splitted."""
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118
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119 def __init__(self, tokens, startline, endline):
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120 self.tokens = tokens
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121 self.startline = startline
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122 # pad linenumbers, e.g. endline == 100 -> fmt_str = '%3d '
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123 self.fmt_str = '%%%dd ' % len(str(endline))
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124
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125 def __iter__(self):
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126 lineno = self.startline
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127 yield (['ln'], self.fmt_str % lineno)
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128 for ttype, value in self.tokens:
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129 lines = value.split('\n')
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130 for line in lines[:-1]:
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131 yield (ttype, line + '\n')
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132 lineno += 1
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133 yield (['ln'], self.fmt_str % lineno)
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134 yield (ttype, lines[-1])