Mercurial > genshi > genshi-test

annotate genshi/template/interpolation.py @ 798:c690de5abafd stable-0.5.x

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Ported [914], [970], and [971] to 0.5.x branch.
author cmlenz
date Thu, 15 Jan 2009 23:50:09 +0000
parents df6a09d69d5c
children 4376010bb97e
rev   line source
407
ea71a51e0258 Move string interpolation code into separate module (`genshi.template.interpolation`).
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1 # -*- coding: utf-8 -*-
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2 #
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3 # Copyright (C) 2007-2008 Edgewall Software
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4 # All rights reserved.
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5 #
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6 # This software is licensed as described in the file COPYING, which
ea71a51e0258 Move string interpolation code into separate module (`genshi.template.interpolation`).
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7 # you should have received as part of this distribution. The terms
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8 # are also available at http://genshi.edgewall.org/wiki/License.
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9 #
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10 # This software consists of voluntary contributions made by many
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11 # individuals. For the exact contribution history, see the revision
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12 # history and logs, available at http://genshi.edgewall.org/log/.
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13
ea71a51e0258 Move string interpolation code into separate module (`genshi.template.interpolation`).
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14 """String interpolation routines, i.e. the splitting up a given text into some
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15 parts that are literal strings, and others that are Python expressions.
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16 """
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17
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18 from itertools import chain
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19 import os
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20 import re
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21 from tokenize import PseudoToken
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22
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23 from genshi.core import TEXT
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24 from genshi.template.base import TemplateSyntaxError, EXPR
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25 from genshi.template.eval import Expression
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26
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27 __all__ = ['interpolate']
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28 __docformat__ = 'restructuredtext en'
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29
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30 NAMESTART = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_'
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31 NAMECHARS = NAMESTART + '.0123456789'
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32 PREFIX = '$'
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33
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34 token_re = re.compile('%s|%s(?s)' % (
df6a09d69d5c Fix expression interpolation for expression containing triple-quoted multiline strings. Thanks to Armin Ronacher for reporting the issue and providing a patch.
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35 r'[uU]?[rR]?("""|\'\'\')((?<!\\)\\\1|.)*?\1',
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36 PseudoToken
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37 ))
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38
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7e6496bde18a The `Template` class and its subclasses, as well as the interpolation API, now take an `filepath` parameter instead of `basedir`. Closes #207. Thanks to Waldemar Kornewald for the patch.
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39 def interpolate(text, filepath=None, lineno=-1, offset=0, lookup='strict'):
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40 """Parse the given string and extract expressions.
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41
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42 This function is a generator that yields `TEXT` events for literal strings,
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43 and `EXPR` events for expressions, depending on the results of parsing the
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44 string.
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45
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46 >>> for kind, data, pos in interpolate("hey ${foo}bar"):
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c690de5abafd Ported [914], [970], and [971] to 0.5.x branch.
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47 ... print kind, repr(data)
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48 TEXT u'hey '
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49 EXPR Expression('foo')
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50 TEXT u'bar'
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51
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52 :param text: the text to parse
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53 :param filepath: absolute path to the file in which the text was found
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54 (optional)
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55 :param lineno: the line number at which the text was found (optional)
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56 :param offset: the column number at which the text starts in the source
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57 (optional)
442
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58 :param lookup: the variable lookup mechanism; either "lenient" (the
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59 default), "strict", or a custom lookup class
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60 :return: a list of `TEXT` and `EXPR` events
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61 :raise TemplateSyntaxError: when a syntax error in an expression is
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62 encountered
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63 """
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64 pos = [filepath, lineno, offset]
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65
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66 textbuf = []
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67 textpos = None
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68 for is_expr, chunk in chain(lex(text, pos, filepath), [(True, '')]):
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69 if is_expr:
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70 if textbuf:
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71 yield TEXT, u''.join(textbuf), textpos
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72 del textbuf[:]
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73 textpos = None
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74 if chunk:
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75 try:
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76 expr = Expression(chunk.strip(), pos[0], pos[1],
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9ae986bcba9a Simplify implementation of `py:with` directive by compiling to a `Suite`, instead of manually breaking up the statement and compiling each part to an `Expression`. Also, the first line of code in a `Suite` is now stored as the "function name" of the bytecode, so that it shows up in tracebacks.
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77 lookup=lookup)
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78 yield EXPR, expr, tuple(pos)
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79 except SyntaxError, err:
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80 raise TemplateSyntaxError(err, filepath, pos[1],
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81 pos[2] + (err.offset or 0))
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82 else:
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83 textbuf.append(chunk)
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84 if textpos is None:
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85 textpos = tuple(pos)
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86
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87 if '\n' in chunk:
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88 lines = chunk.splitlines()
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89 pos[1] += len(lines) - 1
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90 pos[2] += len(lines[-1])
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91 else:
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92 pos[2] += len(chunk)
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93
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94 def lex(text, textpos, filepath):
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95 offset = pos = 0
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96 end = len(text)
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97 escaped = False
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98
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99 while 1:
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100 if escaped:
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101 offset = text.find(PREFIX, offset + 2)
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102 escaped = False
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103 else:
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104 offset = text.find(PREFIX, pos)
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105 if offset < 0 or offset == end - 1:
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106 break
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107 next = text[offset + 1]
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108
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109 if next == '{':
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110 if offset > pos:
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111 yield False, text[pos:offset]
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112 pos = offset + 2
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113 level = 1
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114 while level:
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115 match = token_re.match(text, pos)
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116 if match is None:
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117 raise TemplateSyntaxError('invalid syntax', filepath,
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118 *textpos[1:])
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119 pos = match.end()
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120 tstart, tend = match.regs[3]
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121 token = text[tstart:tend]
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122 if token == '{':
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123 level += 1
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124 elif token == '}':
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125 level -= 1
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126 yield True, text[offset + 2:pos - 1]
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127
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128 elif next in NAMESTART:
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129 if offset > pos:
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130 yield False, text[pos:offset]
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131 pos = offset
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132 pos += 1
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133 while pos < end:
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134 char = text[pos]
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135 if char not in NAMECHARS:
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136 break
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137 pos += 1
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138 yield True, text[offset + 1:pos].strip()
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139
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140 elif not escaped and next == PREFIX:
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141 if offset > pos:
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142 yield False, text[pos:offset]
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143 escaped = True
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144 pos = offset + 1
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145
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146 else:
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147 yield False, text[pos:offset + 1]
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148 pos = offset + 1
ea71a51e0258 Move string interpolation code into separate module (`genshi.template.interpolation`).
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parents:
diff changeset
149
ea71a51e0258 Move string interpolation code into separate module (`genshi.template.interpolation`).
cmlenz
parents:
diff changeset
150 if pos < end:
ea71a51e0258 Move string interpolation code into separate module (`genshi.template.interpolation`).
cmlenz
parents:
diff changeset
151 yield False, text[pos:]
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