ThirdParty/Pygments/pygments/util.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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child 884
901cf274435c
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.util
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4 ~~~~~~~~~~~~~
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5
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6 Utility functions.
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7
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8 :copyright: Copyright 2006-2009 by the Pygments team, see AUTHORS.
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9 :license: BSD, see LICENSE for details.
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10 """
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11 import re
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12 import sys
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13
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14
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15 split_path_re = re.compile(r'[/\\ ]')
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16 doctype_lookup_re = re.compile(r'''(?smx)
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17 (<\?.*?\?>)?\s*
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18 <!DOCTYPE\s+(
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19 [a-zA-Z_][a-zA-Z0-9]*\s+
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20 [a-zA-Z_][a-zA-Z0-9]*\s+
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21 "[^"]*")
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22 [^>]*>
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23 ''')
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24 tag_re = re.compile(r'<(.+?)(\s.*?)?>.*?</.+?>(?uism)')
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25
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26
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27 class ClassNotFound(ValueError):
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28 """
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29 If one of the get_*_by_* functions didn't find a matching class.
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30 """
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31
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32
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33 class OptionError(Exception):
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34 pass
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35
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36
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37 def get_choice_opt(options, optname, allowed, default=None, normcase=False):
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38 string = options.get(optname, default)
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39 if normcase:
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40 string = string.lower()
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41 if string not in allowed:
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42 raise OptionError('Value for option %s must be one of %s' %
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43 (optname, ', '.join(map(str, allowed))))
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44 return string
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45
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46
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47 def get_bool_opt(options, optname, default=None):
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48 string = options.get(optname, default)
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49 if isinstance(string, bool):
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50 return string
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51 elif isinstance(string, int):
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52 return bool(string)
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53 elif not isinstance(string, str):
0
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54 raise OptionError('Invalid type %r for option %s; use '
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55 '1/0, yes/no, true/false, on/off' % (
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56 string, optname))
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57 elif string.lower() in ('1', 'yes', 'true', 'on'):
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58 return True
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59 elif string.lower() in ('0', 'no', 'false', 'off'):
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60 return False
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61 else:
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62 raise OptionError('Invalid value %r for option %s; use '
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63 '1/0, yes/no, true/false, on/off' % (
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64 string, optname))
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65
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66
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67 def get_int_opt(options, optname, default=None):
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68 string = options.get(optname, default)
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69 try:
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70 return int(string)
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71 except TypeError:
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72 raise OptionError('Invalid type %r for option %s; you '
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73 'must give an integer value' % (
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74 string, optname))
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75 except ValueError:
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76 raise OptionError('Invalid value %r for option %s; you '
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77 'must give an integer value' % (
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78 string, optname))
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79
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80
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81 def get_list_opt(options, optname, default=None):
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82 val = options.get(optname, default)
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83 if isinstance(val, str):
0
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84 return val.split()
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85 elif isinstance(val, (list, tuple)):
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86 return list(val)
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87 else:
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88 raise OptionError('Invalid type %r for option %s; you '
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89 'must give a list value' % (
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90 val, optname))
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91
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92
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93 def docstring_headline(obj):
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94 if not obj.__doc__:
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95 return ''
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96 res = []
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97 for line in obj.__doc__.strip().splitlines():
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98 if line.strip():
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99 res.append(" " + line.strip())
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100 else:
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101 break
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102 return ''.join(res).lstrip()
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103
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104
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105 def make_analysator(f):
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106 """
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107 Return a static text analysation function that
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108 returns float values.
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109 """
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110 def text_analyse(text):
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111 rv = f(text)
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112 if not rv:
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113 return 0.0
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114 return min(1.0, max(0.0, float(rv)))
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115 text_analyse.__doc__ = f.__doc__
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116 return staticmethod(text_analyse)
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117
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118
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119 def shebang_matches(text, regex):
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120 """
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121 Check if the given regular expression matches the last part of the
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122 shebang if one exists.
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123
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124 >>> from pygments.util import shebang_matches
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125 >>> shebang_matches('#!/usr/bin/env python', r'python(2\.\d)?')
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126 True
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127 >>> shebang_matches('#!/usr/bin/python2.4', r'python(2\.\d)?')
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128 True
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129 >>> shebang_matches('#!/usr/bin/python-ruby', r'python(2\.\d)?')
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130 False
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131 >>> shebang_matches('#!/usr/bin/python/ruby', r'python(2\.\d)?')
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132 False
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133 >>> shebang_matches('#!/usr/bin/startsomethingwith python',
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134 ... r'python(2\.\d)?')
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135 True
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136
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137 It also checks for common windows executable file extensions::
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138
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139 >>> shebang_matches('#!C:\\Python2.4\\Python.exe', r'python(2\.\d)?')
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140 True
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141
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142 Parameters (``'-f'`` or ``'--foo'`` are ignored so ``'perl'`` does
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143 the same as ``'perl -e'``)
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144
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145 Note that this method automatically searches the whole string (eg:
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146 the regular expression is wrapped in ``'^$'``)
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147 """
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148 index = text.find('\n')
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parents:
diff changeset
149 if index >= 0:
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150 first_line = text[:index].lower()
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151 else:
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152 first_line = text.lower()
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153 if first_line.startswith('#!'):
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diff changeset
154 try:
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155 found = [x for x in split_path_re.split(first_line[2:].strip())
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156 if x and not x.startswith('-')][-1]
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157 except IndexError:
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158 return False
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159 regex = re.compile('^%s(\.(exe|cmd|bat|bin))?$' % regex, re.IGNORECASE)
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160 if regex.search(found) is not None:
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161 return True
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162 return False
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163
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164
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165 def doctype_matches(text, regex):
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166 """
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parents:
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167 Check if the doctype matches a regular expression (if present).
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168 Note that this method only checks the first part of a DOCTYPE.
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169 eg: 'html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"'
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170 """
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171 m = doctype_lookup_re.match(text)
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diff changeset
172 if m is None:
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173 return False
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174 doctype = m.group(2)
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175 return re.compile(regex).match(doctype.strip()) is not None
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176
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177
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178 def html_doctype_matches(text):
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179 """
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180 Check if the file looks like it has a html doctype.
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181 """
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182 return doctype_matches(text, r'html\s+PUBLIC\s+"-//W3C//DTD X?HTML.*')
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parents:
diff changeset
183
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parents:
diff changeset
184
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diff changeset
185 _looks_like_xml_cache = {}
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parents:
diff changeset
186 def looks_like_xml(text):
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parents:
diff changeset
187 """
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
188 Check if a doctype exists or if we have some tags.
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parents:
diff changeset
189 """
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
190 key = hash(text)
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
191 try:
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parents:
diff changeset
192 return _looks_like_xml_cache[key]
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parents:
diff changeset
193 except KeyError:
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parents:
diff changeset
194 m = doctype_lookup_re.match(text)
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parents:
diff changeset
195 if m is not None:
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parents:
diff changeset
196 return True
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
197 rv = tag_re.search(text[:1000]) is not None
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parents:
diff changeset
198 _looks_like_xml_cache[key] = rv
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diff changeset
199 return rv
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
200
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
201 # Python 2/3 compatibility
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parents:
diff changeset
202
de9c2efb9d02 Started porting eric4 to Python3
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parents:
diff changeset
203 if sys.version_info < (3,0):
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parents:
diff changeset
204 b = bytes = str
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
205 u_prefix = 'u'
12
1d8dd9706f46 First commit after changing to Python 3.1.
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parents: 0
diff changeset
206 import io, io
1d8dd9706f46 First commit after changing to Python 3.1.
Detlev Offenbach <detlev@die-offenbachs.de>
parents: 0
diff changeset
207 BytesIO = io.StringIO
1d8dd9706f46 First commit after changing to Python 3.1.
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parents: 0
diff changeset
208 StringIO = io.StringIO
0
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
209 else:
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
210 import builtins
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
211 bytes = builtins.bytes
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
212 u_prefix = ''
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
213 def b(s):
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
214 if isinstance(s, str):
12
1d8dd9706f46 First commit after changing to Python 3.1.
Detlev Offenbach <detlev@die-offenbachs.de>
parents: 0
diff changeset
215 return bytes(list(map(ord, s)))
0
de9c2efb9d02 Started porting eric4 to Python3
Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
216 elif isinstance(s, bytes):
de9c2efb9d02 Started porting eric4 to Python3
Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
217 return s
de9c2efb9d02 Started porting eric4 to Python3
Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
218 else:
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
219 raise TypeError("Invalid argument %r for b()" % (s,))
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
220 import io
de9c2efb9d02 Started porting eric4 to Python3
Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
221 BytesIO = io.BytesIO
de9c2efb9d02 Started porting eric4 to Python3
Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
222 StringIO = io.StringIO

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