Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/docutils/utils/code_analyzer.py @ 4:79f47841a781 draft

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
"planemo upload commit 2a0fe2cc28b09e101d37293e53e82f61762262ec"
author shellac
date Thu, 14 May 2020 16:47:39 -0400
parents 26e78fe6e8c4
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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: 2019-08-26 18:46:50 +0200 (Mo, 26. Aug 2019) $
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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 from pkg_resources import DistributionNotFound as ResourceError
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13 except (ImportError, RuntimeError):
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14 class ResourceError(ApplicationError):
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15 pass # stub
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16 try:
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17 import pygments
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18 from pygments.lexers import get_lexer_by_name
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19 from pygments.formatters.html import _get_ttype_class
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20 with_pygments = True
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21 except ImportError:
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22 with_pygments = False
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23
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24 # Filter the following token types from the list of class arguments:
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25 unstyled_tokens = ['token', # Token (base token type)
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26 'text', # Token.Text
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27 ''] # short name for Token and Text
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28 # (Add, e.g., Token.Punctuation with ``unstyled_tokens += 'punctuation'``.)
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29
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30 class LexerError(ApplicationError):
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31 pass
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32
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33 class Lexer(object):
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34 """Parse `code` lines and yield "classified" tokens.
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35
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36 Arguments
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37
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38 code -- string of source code to parse,
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39 language -- formal language the code is written in,
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40 tokennames -- either 'long', 'short', or '' (see below).
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41
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42 Merge subsequent tokens of the same token-type.
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43
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44 Iterating over an instance yields the tokens as ``(tokentype, value)``
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45 tuples. The value of `tokennames` configures the naming of the tokentype:
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46
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47 'long': downcased full token type name,
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48 'short': short name defined by pygments.token.STANDARD_TYPES
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49 (= class argument used in pygments html output),
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50 'none': skip lexical analysis.
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51 """
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52
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53 def __init__(self, code, language, tokennames='short'):
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54 """
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55 Set up a lexical analyzer for `code` in `language`.
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56 """
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57 self.code = code
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58 self.language = language
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59 self.tokennames = tokennames
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60 self.lexer = None
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61 # get lexical analyzer for `language`:
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62 if language in ('', 'text') or tokennames == 'none':
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63 return
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64 if not with_pygments:
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65 raise LexerError('Cannot analyze code. '
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66 'Pygments package not found.')
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67 try:
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68 self.lexer = get_lexer_by_name(self.language)
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69 except (pygments.util.ClassNotFound, ResourceError):
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70 raise LexerError('Cannot analyze code. '
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71 'No Pygments lexer found for "%s".' % language)
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72 # self.lexer.add_filter('tokenmerge')
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73 # Since version 1.2. (released Jan 01, 2010) Pygments has a
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74 # TokenMergeFilter. # ``self.merge(tokens)`` in __iter__ could
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75 # be replaced by ``self.lexer.add_filter('tokenmerge')`` in __init__.
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76 # However, `merge` below also strips a final newline added by pygments.
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77 #
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78 # self.lexer.add_filter('tokenmerge')
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79
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80 def merge(self, tokens):
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81 """Merge subsequent tokens of same token-type.
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82
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83 Also strip the final newline (added by pygments).
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84 """
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85 tokens = iter(tokens)
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86 (lasttype, lastval) = next(tokens)
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87 for ttype, value in tokens:
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88 if ttype is lasttype:
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89 lastval += value
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90 else:
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91 yield(lasttype, lastval)
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92 (lasttype, lastval) = (ttype, value)
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93 if lastval.endswith('\n'):
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94 lastval = lastval[:-1]
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95 if lastval:
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96 yield(lasttype, lastval)
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97
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98 def __iter__(self):
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99 """Parse self.code and yield "classified" tokens.
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100 """
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101 if self.lexer is None:
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102 yield ([], self.code)
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103 return
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104 tokens = pygments.lex(self.code, self.lexer)
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105 for tokentype, value in self.merge(tokens):
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106 if self.tokennames == 'long': # long CSS class args
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107 classes = str(tokentype).lower().split('.')
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108 else: # short CSS class args
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109 classes = [_get_ttype_class(tokentype)]
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110 classes = [cls for cls in classes if cls not in unstyled_tokens]
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111 yield (classes, value)
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112
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113
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114 class NumberLines(object):
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115 """Insert linenumber-tokens at the start of every code line.
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116
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117 Arguments
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118
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119 tokens -- iterable of ``(classes, value)`` tuples
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120 startline -- first line number
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121 endline -- last line number
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122
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123 Iterating over an instance yields the tokens with a
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124 ``(['ln'], '<the line number>')`` token added for every code line.
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125 Multi-line tokens are splitted."""
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126
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127 def __init__(self, tokens, startline, endline):
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128 self.tokens = tokens
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129 self.startline = startline
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130 # pad linenumbers, e.g. endline == 100 -> fmt_str = '%3d '
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131 self.fmt_str = '%%%dd ' % len(str(endline))
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132
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133 def __iter__(self):
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134 lineno = self.startline
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135 yield (['ln'], self.fmt_str % lineno)
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136 for ttype, value in self.tokens:
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137 lines = value.split('\n')
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138 for line in lines[:-1]:
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139 yield (ttype, line + '\n')
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140 lineno += 1
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141 yield (['ln'], self.fmt_str % lineno)
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142 yield (ttype, lines[-1])