ThirdParty/Pygments/pygments/filters/__init__.py

Sat, 02 Jan 2010 15:11:35 +0000

author
Detlev Offenbach <detlev@die-offenbachs.de>
date
Sat, 02 Jan 2010 15:11:35 +0000
changeset 12
1d8dd9706f46
parent 0
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child 684
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permissions
-rw-r--r--

First commit after changing to Python 3.1.

0
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1 # -*- coding: utf-8 -*-
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2 """
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3 pygments.filters
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4 ~~~~~~~~~~~~~~~~
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5
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6 Module containing filter lookup functions and default
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7 filters.
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8
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9 :copyright: Copyright 2006-2009 by the Pygments team, see AUTHORS.
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10 :license: BSD, see LICENSE for details.
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11 """
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12 try:
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13 set
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14 except NameError:
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15 from sets import Set as set
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16
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17 import re
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18 from pygments.token import String, Comment, Keyword, Name, Error, Whitespace, \
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19 string_to_tokentype
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20 from pygments.filter import Filter
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21 from pygments.util import get_list_opt, get_int_opt, get_bool_opt, get_choice_opt, \
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22 ClassNotFound, OptionError
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23 from pygments.plugin import find_plugin_filters
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24
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25
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26 def find_filter_class(filtername):
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27 """
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28 Lookup a filter by name. Return None if not found.
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29 """
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30 if filtername in FILTERS:
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31 return FILTERS[filtername]
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32 for name, cls in find_plugin_filters():
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33 if name == filtername:
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34 return cls
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35 return None
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36
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37
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38 def get_filter_by_name(filtername, **options):
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39 """
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40 Return an instantiated filter. Options are passed to the filter
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41 initializer if wanted. Raise a ClassNotFound if not found.
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42 """
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43 cls = find_filter_class(filtername)
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44 if cls:
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45 return cls(**options)
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46 else:
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47 raise ClassNotFound('filter %r not found' % filtername)
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48
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49
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50 def get_all_filters():
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51 """
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52 Return a generator of all filter names.
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53 """
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54 for name in FILTERS:
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55 yield name
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56 for name, _ in find_plugin_filters():
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57 yield name
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58
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59
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60 def _replace_special(ttype, value, regex, specialttype,
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61 replacefunc=lambda x: x):
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62 last = 0
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63 for match in regex.finditer(value):
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64 start, end = match.start(), match.end()
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65 if start != last:
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66 yield ttype, value[last:start]
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67 yield specialttype, replacefunc(value[start:end])
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68 last = end
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69 if last != len(value):
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70 yield ttype, value[last:]
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71
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72
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73 class CodeTagFilter(Filter):
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74 """
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75 Highlight special code tags in comments and docstrings.
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76
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77 Options accepted:
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78
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79 `codetags` : list of strings
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80 A list of strings that are flagged as code tags. The default is to
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81 highlight ``XXX``, ``TODO``, ``BUG`` and ``NOTE``.
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82 """
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83
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84 def __init__(self, **options):
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85 Filter.__init__(self, **options)
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86 tags = get_list_opt(options, 'codetags',
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87 ['XXX', 'TODO', 'BUG', 'NOTE'])
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88 self.tag_re = re.compile(r'\b(%s)\b' % '|'.join([
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89 re.escape(tag) for tag in tags if tag
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90 ]))
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91
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92 def filter(self, lexer, stream):
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93 regex = self.tag_re
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94 for ttype, value in stream:
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95 if ttype in String.Doc or \
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96 ttype in Comment and \
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97 ttype not in Comment.Preproc:
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98 for sttype, svalue in _replace_special(ttype, value, regex,
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99 Comment.Special):
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100 yield sttype, svalue
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101 else:
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102 yield ttype, value
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103
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104
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105 class KeywordCaseFilter(Filter):
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106 """
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107 Convert keywords to lowercase or uppercase or capitalize them, which
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108 means first letter uppercase, rest lowercase.
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109
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110 This can be useful e.g. if you highlight Pascal code and want to adapt the
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111 code to your styleguide.
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112
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113 Options accepted:
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114
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115 `case` : string
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116 The casing to convert keywords to. Must be one of ``'lower'``,
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117 ``'upper'`` or ``'capitalize'``. The default is ``'lower'``.
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118 """
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119
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120 def __init__(self, **options):
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121 Filter.__init__(self, **options)
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122 case = get_choice_opt(options, 'case', ['lower', 'upper', 'capitalize'], 'lower')
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123 self.convert = getattr(str, case)
0
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124
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125 def filter(self, lexer, stream):
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126 for ttype, value in stream:
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127 if ttype in Keyword:
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128 yield ttype, self.convert(value)
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129 else:
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130 yield ttype, value
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131
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132
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133 class NameHighlightFilter(Filter):
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134 """
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diff changeset
135 Highlight a normal Name token with a different token type.
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parents:
diff changeset
136
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parents:
diff changeset
137 Example::
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diff changeset
138
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parents:
diff changeset
139 filter = NameHighlightFilter(
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parents:
diff changeset
140 names=['foo', 'bar', 'baz'],
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parents:
diff changeset
141 tokentype=Name.Function,
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parents:
diff changeset
142 )
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143
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parents:
diff changeset
144 This would highlight the names "foo", "bar" and "baz"
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parents:
diff changeset
145 as functions. `Name.Function` is the default token type.
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146
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diff changeset
147 Options accepted:
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148
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parents:
diff changeset
149 `names` : list of strings
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parents:
diff changeset
150 A list of names that should be given the different token type.
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parents:
diff changeset
151 There is no default.
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parents:
diff changeset
152 `tokentype` : TokenType or string
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parents:
diff changeset
153 A token type or a string containing a token type name that is
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diff changeset
154 used for highlighting the strings in `names`. The default is
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diff changeset
155 `Name.Function`.
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parents:
diff changeset
156 """
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parents:
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157
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parents:
diff changeset
158 def __init__(self, **options):
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parents:
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159 Filter.__init__(self, **options)
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parents:
diff changeset
160 self.names = set(get_list_opt(options, 'names', []))
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parents:
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161 tokentype = options.get('tokentype')
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parents:
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162 if tokentype:
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parents:
diff changeset
163 self.tokentype = string_to_tokentype(tokentype)
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164 else:
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165 self.tokentype = Name.Function
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166
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167 def filter(self, lexer, stream):
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168 for ttype, value in stream:
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169 if ttype is Name and value in self.names:
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170 yield self.tokentype, value
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parents:
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171 else:
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parents:
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172 yield ttype, value
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173
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174
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parents:
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175 class ErrorToken(Exception):
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176 pass
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177
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parents:
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178 class RaiseOnErrorTokenFilter(Filter):
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parents:
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179 """
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parents:
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180 Raise an exception when the lexer generates an error token.
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181
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182 Options accepted:
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parents:
diff changeset
183
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parents:
diff changeset
184 `excclass` : Exception class
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parents:
diff changeset
185 The exception class to raise.
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parents:
diff changeset
186 The default is `pygments.filters.ErrorToken`.
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187
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188 *New in Pygments 0.8.*
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parents:
diff changeset
189 """
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parents:
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190
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parents:
diff changeset
191 def __init__(self, **options):
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parents:
diff changeset
192 Filter.__init__(self, **options)
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parents:
diff changeset
193 self.exception = options.get('excclass', ErrorToken)
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parents:
diff changeset
194 try:
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parents:
diff changeset
195 # issubclass() will raise TypeError if first argument is not a class
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parents:
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196 if not issubclass(self.exception, Exception):
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parents:
diff changeset
197 raise TypeError
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parents:
diff changeset
198 except TypeError:
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parents:
diff changeset
199 raise OptionError('excclass option is not an exception class')
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diff changeset
200
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parents:
diff changeset
201 def filter(self, lexer, stream):
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parents:
diff changeset
202 for ttype, value in stream:
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
203 if ttype is Error:
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
204 raise self.exception(value)
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parents:
diff changeset
205 yield ttype, value
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parents:
diff changeset
206
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parents:
diff changeset
207
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parents:
diff changeset
208 class VisibleWhitespaceFilter(Filter):
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parents:
diff changeset
209 """
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parents:
diff changeset
210 Convert tabs, newlines and/or spaces to visible characters.
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parents:
diff changeset
211
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parents:
diff changeset
212 Options accepted:
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parents:
diff changeset
213
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parents:
diff changeset
214 `spaces` : string or bool
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parents:
diff changeset
215 If this is a one-character string, spaces will be replaces by this string.
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parents:
diff changeset
216 If it is another true value, spaces will be replaced by ``·`` (unicode
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parents:
diff changeset
217 MIDDLE DOT). If it is a false value, spaces will not be replaced. The
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parents:
diff changeset
218 default is ``False``.
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parents:
diff changeset
219 `tabs` : string or bool
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parents:
diff changeset
220 The same as for `spaces`, but the default replacement character is ``»``
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parents:
diff changeset
221 (unicode RIGHT-POINTING DOUBLE ANGLE QUOTATION MARK). The default value
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parents:
diff changeset
222 is ``False``. Note: this will not work if the `tabsize` option for the
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parents:
diff changeset
223 lexer is nonzero, as tabs will already have been expanded then.
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parents:
diff changeset
224 `tabsize` : int
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parents:
diff changeset
225 If tabs are to be replaced by this filter (see the `tabs` option), this
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parents:
diff changeset
226 is the total number of characters that a tab should be expanded to.
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parents:
diff changeset
227 The default is ``8``.
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parents:
diff changeset
228 `newlines` : string or bool
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parents:
diff changeset
229 The same as for `spaces`, but the default replacement character is ``¶``
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parents:
diff changeset
230 (unicode PILCROW SIGN). The default value is ``False``.
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parents:
diff changeset
231 `wstokentype` : bool
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
232 If true, give whitespace the special `Whitespace` token type. This allows
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
233 styling the visible whitespace differently (e.g. greyed out), but it can
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parents:
diff changeset
234 disrupt background colors. The default is ``True``.
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parents:
diff changeset
235
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parents:
diff changeset
236 *New in Pygments 0.8.*
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parents:
diff changeset
237 """
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parents:
diff changeset
238
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parents:
diff changeset
239 def __init__(self, **options):
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parents:
diff changeset
240 Filter.__init__(self, **options)
12
1d8dd9706f46 First commit after changing to Python 3.1.
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parents: 0
diff changeset
241 for name, default in list({'spaces': '·', 'tabs': '»', 'newlines': '¶'}.items()):
0
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parents:
diff changeset
242 opt = options.get(name, False)
12
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parents: 0
diff changeset
243 if isinstance(opt, str) and len(opt) == 1:
0
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parents:
diff changeset
244 setattr(self, name, opt)
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parents:
diff changeset
245 else:
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parents:
diff changeset
246 setattr(self, name, (opt and default or ''))
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parents:
diff changeset
247 tabsize = get_int_opt(options, 'tabsize', 8)
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parents:
diff changeset
248 if self.tabs:
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
249 self.tabs += ' '*(tabsize-1)
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parents:
diff changeset
250 if self.newlines:
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
251 self.newlines += '\n'
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
252 self.wstt = get_bool_opt(options, 'wstokentype', True)
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parents:
diff changeset
253
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parents:
diff changeset
254 def filter(self, lexer, stream):
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
255 if self.wstt:
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
256 spaces = self.spaces or ' '
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parents:
diff changeset
257 tabs = self.tabs or '\t'
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parents:
diff changeset
258 newlines = self.newlines or '\n'
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parents:
diff changeset
259 regex = re.compile(r'\s')
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
260 def replacefunc(wschar):
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
261 if wschar == ' ':
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
262 return spaces
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
263 elif wschar == '\t':
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
264 return tabs
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
265 elif wschar == '\n':
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parents:
diff changeset
266 return newlines
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parents:
diff changeset
267 return wschar
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parents:
diff changeset
268
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parents:
diff changeset
269 for ttype, value in stream:
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270 for sttype, svalue in _replace_special(ttype, value, regex,
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271 Whitespace, replacefunc):
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272 yield sttype, svalue
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273 else:
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274 spaces, tabs, newlines = self.spaces, self.tabs, self.newlines
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275 # simpler processing
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276 for ttype, value in stream:
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277 if spaces:
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278 value = value.replace(' ', spaces)
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279 if tabs:
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280 value = value.replace('\t', tabs)
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281 if newlines:
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282 value = value.replace('\n', newlines)
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283 yield ttype, value
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284
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285
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286 FILTERS = {
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287 'codetagify': CodeTagFilter,
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288 'keywordcase': KeywordCaseFilter,
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289 'highlight': NameHighlightFilter,
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290 'raiseonerror': RaiseOnErrorTokenFilter,
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parents:
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291 'whitespace': VisibleWhitespaceFilter,
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292 }

eric ide

mercurial