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annotate venv/lib/python2.7/re.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 #
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2 # Secret Labs' Regular Expression Engine
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3 #
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4 # re-compatible interface for the sre matching engine
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5 #
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6 # Copyright (c) 1998-2001 by Secret Labs AB. All rights reserved.
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7 #
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8 # This version of the SRE library can be redistributed under CNRI's
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9 # Python 1.6 license. For any other use, please contact Secret Labs
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10 # AB (info@pythonware.com).
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11 #
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12 # Portions of this engine have been developed in cooperation with
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13 # CNRI. Hewlett-Packard provided funding for 1.6 integration and
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14 # other compatibility work.
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15 #
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16
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17 r"""Support for regular expressions (RE).
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18
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19 This module provides regular expression matching operations similar to
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20 those found in Perl. It supports both 8-bit and Unicode strings; both
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21 the pattern and the strings being processed can contain null bytes and
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22 characters outside the US ASCII range.
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23
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24 Regular expressions can contain both special and ordinary characters.
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25 Most ordinary characters, like "A", "a", or "0", are the simplest
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26 regular expressions; they simply match themselves. You can
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27 concatenate ordinary characters, so last matches the string 'last'.
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28
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29 The special characters are:
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30 "." Matches any character except a newline.
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31 "^" Matches the start of the string.
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32 "$" Matches the end of the string or just before the newline at
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33 the end of the string.
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34 "*" Matches 0 or more (greedy) repetitions of the preceding RE.
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35 Greedy means that it will match as many repetitions as possible.
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36 "+" Matches 1 or more (greedy) repetitions of the preceding RE.
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37 "?" Matches 0 or 1 (greedy) of the preceding RE.
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38 *?,+?,?? Non-greedy versions of the previous three special characters.
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39 {m,n} Matches from m to n repetitions of the preceding RE.
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40 {m,n}? Non-greedy version of the above.
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41 "\\" Either escapes special characters or signals a special sequence.
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42 [] Indicates a set of characters.
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43 A "^" as the first character indicates a complementing set.
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44 "|" A|B, creates an RE that will match either A or B.
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45 (...) Matches the RE inside the parentheses.
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46 The contents can be retrieved or matched later in the string.
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47 (?iLmsux) Set the I, L, M, S, U, or X flag for the RE (see below).
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48 (?:...) Non-grouping version of regular parentheses.
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49 (?P<name>...) The substring matched by the group is accessible by name.
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50 (?P=name) Matches the text matched earlier by the group named name.
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51 (?#...) A comment; ignored.
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52 (?=...) Matches if ... matches next, but doesn't consume the string.
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53 (?!...) Matches if ... doesn't match next.
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54 (?<=...) Matches if preceded by ... (must be fixed length).
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55 (?<!...) Matches if not preceded by ... (must be fixed length).
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56 (?(id/name)yes|no) Matches yes pattern if the group with id/name matched,
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57 the (optional) no pattern otherwise.
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58
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59 The special sequences consist of "\\" and a character from the list
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60 below. If the ordinary character is not on the list, then the
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61 resulting RE will match the second character.
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62 \number Matches the contents of the group of the same number.
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63 \A Matches only at the start of the string.
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64 \Z Matches only at the end of the string.
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65 \b Matches the empty string, but only at the start or end of a word.
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66 \B Matches the empty string, but not at the start or end of a word.
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67 \d Matches any decimal digit; equivalent to the set [0-9].
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68 \D Matches any non-digit character; equivalent to the set [^0-9].
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69 \s Matches any whitespace character; equivalent to [ \t\n\r\f\v].
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70 \S Matches any non-whitespace character; equiv. to [^ \t\n\r\f\v].
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71 \w Matches any alphanumeric character; equivalent to [a-zA-Z0-9_].
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72 With LOCALE, it will match the set [0-9_] plus characters defined
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73 as letters for the current locale.
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74 \W Matches the complement of \w.
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75 \\ Matches a literal backslash.
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76
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77 This module exports the following functions:
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78 match Match a regular expression pattern to the beginning of a string.
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79 search Search a string for the presence of a pattern.
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80 sub Substitute occurrences of a pattern found in a string.
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81 subn Same as sub, but also return the number of substitutions made.
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82 split Split a string by the occurrences of a pattern.
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83 findall Find all occurrences of a pattern in a string.
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84 finditer Return an iterator yielding a match object for each match.
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85 compile Compile a pattern into a RegexObject.
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86 purge Clear the regular expression cache.
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87 escape Backslash all non-alphanumerics in a string.
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88
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89 Some of the functions in this module takes flags as optional parameters:
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90 I IGNORECASE Perform case-insensitive matching.
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91 L LOCALE Make \w, \W, \b, \B, dependent on the current locale.
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92 M MULTILINE "^" matches the beginning of lines (after a newline)
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93 as well as the string.
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94 "$" matches the end of lines (before a newline) as well
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95 as the end of the string.
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96 S DOTALL "." matches any character at all, including the newline.
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97 X VERBOSE Ignore whitespace and comments for nicer looking RE's.
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98 U UNICODE Make \w, \W, \b, \B, dependent on the Unicode locale.
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99
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100 This module also defines an exception 'error'.
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101
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102 """
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103
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104 import sys
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105 import sre_compile
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106 import sre_parse
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107 try:
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108 import _locale
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109 except ImportError:
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110 _locale = None
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111
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112 # public symbols
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113 __all__ = [ "match", "search", "sub", "subn", "split", "findall",
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114 "compile", "purge", "template", "escape", "I", "L", "M", "S", "X",
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115 "U", "IGNORECASE", "LOCALE", "MULTILINE", "DOTALL", "VERBOSE",
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116 "UNICODE", "error" ]
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117
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118 __version__ = "2.2.1"
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119
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120 # flags
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121 I = IGNORECASE = sre_compile.SRE_FLAG_IGNORECASE # ignore case
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122 L = LOCALE = sre_compile.SRE_FLAG_LOCALE # assume current 8-bit locale
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123 U = UNICODE = sre_compile.SRE_FLAG_UNICODE # assume unicode locale
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124 M = MULTILINE = sre_compile.SRE_FLAG_MULTILINE # make anchors look for newline
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125 S = DOTALL = sre_compile.SRE_FLAG_DOTALL # make dot match newline
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126 X = VERBOSE = sre_compile.SRE_FLAG_VERBOSE # ignore whitespace and comments
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127
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128 # sre extensions (experimental, don't rely on these)
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129 T = TEMPLATE = sre_compile.SRE_FLAG_TEMPLATE # disable backtracking
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130 DEBUG = sre_compile.SRE_FLAG_DEBUG # dump pattern after compilation
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131
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132 # sre exception
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133 error = sre_compile.error
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134
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135 # --------------------------------------------------------------------
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136 # public interface
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137
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138 def match(pattern, string, flags=0):
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139 """Try to apply the pattern at the start of the string, returning
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140 a match object, or None if no match was found."""
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141 return _compile(pattern, flags).match(string)
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142
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143 def search(pattern, string, flags=0):
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144 """Scan through string looking for a match to the pattern, returning
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145 a match object, or None if no match was found."""
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146 return _compile(pattern, flags).search(string)
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147
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148 def sub(pattern, repl, string, count=0, flags=0):
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149 """Return the string obtained by replacing the leftmost
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150 non-overlapping occurrences of the pattern in string by the
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151 replacement repl. repl can be either a string or a callable;
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152 if a string, backslash escapes in it are processed. If it is
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153 a callable, it's passed the match object and must return
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154 a replacement string to be used."""
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155 return _compile(pattern, flags).sub(repl, string, count)
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156
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157 def subn(pattern, repl, string, count=0, flags=0):
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158 """Return a 2-tuple containing (new_string, number).
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159 new_string is the string obtained by replacing the leftmost
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160 non-overlapping occurrences of the pattern in the source
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161 string by the replacement repl. number is the number of
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162 substitutions that were made. repl can be either a string or a
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163 callable; if a string, backslash escapes in it are processed.
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164 If it is a callable, it's passed the match object and must
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165 return a replacement string to be used."""
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166 return _compile(pattern, flags).subn(repl, string, count)
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167
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168 def split(pattern, string, maxsplit=0, flags=0):
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169 """Split the source string by the occurrences of the pattern,
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170 returning a list containing the resulting substrings."""
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171 return _compile(pattern, flags).split(string, maxsplit)
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172
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173 def findall(pattern, string, flags=0):
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174 """Return a list of all non-overlapping matches in the string.
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175
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176 If one or more groups are present in the pattern, return a
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177 list of groups; this will be a list of tuples if the pattern
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178 has more than one group.
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179
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180 Empty matches are included in the result."""
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181 return _compile(pattern, flags).findall(string)
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182
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183 if sys.hexversion >= 0x02020000:
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184 __all__.append("finditer")
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185 def finditer(pattern, string, flags=0):
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186 """Return an iterator over all non-overlapping matches in the
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187 string. For each match, the iterator returns a match object.
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188
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189 Empty matches are included in the result."""
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190 return _compile(pattern, flags).finditer(string)
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191
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192 def compile(pattern, flags=0):
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193 "Compile a regular expression pattern, returning a pattern object."
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194 return _compile(pattern, flags)
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195
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196 def purge():
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197 "Clear the regular expression cache"
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198 _cache.clear()
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199 _cache_repl.clear()
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200
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201 def template(pattern, flags=0):
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202 "Compile a template pattern, returning a pattern object"
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203 return _compile(pattern, flags|T)
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204
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205 _alphanum = frozenset(
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206 "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
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207
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208 def escape(pattern):
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209 "Escape all non-alphanumeric characters in pattern."
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210 s = list(pattern)
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211 alphanum = _alphanum
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212 for i, c in enumerate(pattern):
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213 if c not in alphanum:
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214 if c == "\000":
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215 s[i] = "\\000"
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216 else:
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217 s[i] = "\\" + c
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218 return pattern[:0].join(s)
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219
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220 # --------------------------------------------------------------------
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221 # internals
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222
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223 _cache = {}
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224 _cache_repl = {}
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225
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226 _pattern_type = type(sre_compile.compile("", 0))
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227
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228 _MAXCACHE = 100
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229
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230 def _compile(*key):
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231 # internal: compile pattern
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232 pattern, flags = key
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233 bypass_cache = flags & DEBUG
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234 if not bypass_cache:
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235 cachekey = (type(key[0]),) + key
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236 try:
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237 p, loc = _cache[cachekey]
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238 if loc is None or loc == _locale.setlocale(_locale.LC_CTYPE):
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239 return p
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240 except KeyError:
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241 pass
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242 if isinstance(pattern, _pattern_type):
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243 if flags:
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244 raise ValueError('Cannot process flags argument with a compiled pattern')
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245 return pattern
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246 if not sre_compile.isstring(pattern):
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247 raise TypeError, "first argument must be string or compiled pattern"
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248 try:
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249 p = sre_compile.compile(pattern, flags)
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250 except error, v:
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251 raise error, v # invalid expression
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252 if not bypass_cache:
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253 if len(_cache) >= _MAXCACHE:
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254 _cache.clear()
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255 if p.flags & LOCALE:
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256 if not _locale:
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257 return p
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258 loc = _locale.setlocale(_locale.LC_CTYPE)
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259 else:
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260 loc = None
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261 _cache[cachekey] = p, loc
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262 return p
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263
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264 def _compile_repl(*key):
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265 # internal: compile replacement pattern
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266 p = _cache_repl.get(key)
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267 if p is not None:
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268 return p
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269 repl, pattern = key
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270 try:
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271 p = sre_parse.parse_template(repl, pattern)
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272 except error, v:
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273 raise error, v # invalid expression
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274 if len(_cache_repl) >= _MAXCACHE:
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275 _cache_repl.clear()
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276 _cache_repl[key] = p
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277 return p
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278
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279 def _expand(pattern, match, template):
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280 # internal: match.expand implementation hook
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281 template = sre_parse.parse_template(template, pattern)
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282 return sre_parse.expand_template(template, match)
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283
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284 def _subx(pattern, template):
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285 # internal: pattern.sub/subn implementation helper
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286 template = _compile_repl(template, pattern)
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287 if not template[0] and len(template[1]) == 1:
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288 # literal replacement
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289 return template[1][0]
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290 def filter(match, template=template):
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291 return sre_parse.expand_template(template, match)
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292 return filter
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293
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294 # register myself for pickling
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295
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296 import copy_reg
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297
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298 def _pickle(p):
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299 return _compile, (p.pattern, p.flags)
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300
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301 copy_reg.pickle(_pattern_type, _pickle, _compile)
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302
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303 # --------------------------------------------------------------------
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304 # experimental stuff (see python-dev discussions for details)
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305
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306 class Scanner:
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307 def __init__(self, lexicon, flags=0):
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308 from sre_constants import BRANCH, SUBPATTERN
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309 self.lexicon = lexicon
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310 # combine phrases into a compound pattern
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311 p = []
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312 s = sre_parse.Pattern()
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313 s.flags = flags
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314 for phrase, action in lexicon:
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315 p.append(sre_parse.SubPattern(s, [
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316 (SUBPATTERN, (len(p)+1, sre_parse.parse(phrase, flags))),
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317 ]))
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318 s.groups = len(p)+1
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319 p = sre_parse.SubPattern(s, [(BRANCH, (None, p))])
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320 self.scanner = sre_compile.compile(p)
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321 def scan(self, string):
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322 result = []
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323 append = result.append
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324 match = self.scanner.scanner(string).match
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325 i = 0
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326 while 1:
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327 m = match()
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328 if not m:
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329 break
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330 j = m.end()
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331 if i == j:
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332 break
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333 action = self.lexicon[m.lastindex-1][1]
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334 if hasattr(action, '__call__'):
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335 self.match = m
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336 action = action(self, m.group())
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337 if action is not None:
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338 append(action)
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339 i = j
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340 return result, string[i:]