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annotate genshi/template/interpolation.py @ 991:0d4e1bafad8f stable-0.6.x

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Merge r1213 from trunk (fix infinite loop in interpolation brace matching caused by a change in 2.7).
author hodgestar
date Sat, 26 Jan 2013 11:59:30 +0000
parents f3d998cc941e
children
rev   line source
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f37d8e6acdf2 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) 2007-2009 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
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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
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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)' % (
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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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39
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fc6d9d2a3527 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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40 def interpolate(text, filepath=None, lineno=-1, offset=0, lookup='strict'):
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41 """Parse the given string and extract expressions.
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42
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43 This function is a generator that yields `TEXT` events for literal strings,
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44 and `EXPR` events for expressions, depending on the results of parsing the
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45 string.
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46
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47 >>> for kind, data, pos in interpolate("hey ${foo}bar"):
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48 ... print('%s %r' % (kind, data))
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49 TEXT 'hey '
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50 EXPR Expression('foo')
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51 TEXT 'bar'
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52
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53 :param text: the text to parse
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54 :param filepath: absolute path to the file in which the text was found
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55 (optional)
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56 :param lineno: the line number at which the text was found (optional)
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57 :param offset: the column number at which the text starts in the source
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58 (optional)
442
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59 :param lookup: the variable lookup mechanism; either "lenient" (the
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60 default), "strict", or a custom lookup class
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61 :return: a list of `TEXT` and `EXPR` events
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62 :raise TemplateSyntaxError: when a syntax error in an expression is
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63 encountered
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64 """
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65 pos = [filepath, lineno, offset]
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66
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67 textbuf = []
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68 textpos = None
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69 for is_expr, chunk in chain(lex(text, pos, filepath), [(True, '')]):
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70 if is_expr:
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71 if textbuf:
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72 yield TEXT, ''.join(textbuf), textpos
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73 del textbuf[:]
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74 textpos = None
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75 if chunk:
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76 try:
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77 expr = Expression(chunk.strip(), pos[0], pos[1],
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59fbd7586454 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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78 lookup=lookup)
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79 yield EXPR, expr, tuple(pos)
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80 except SyntaxError, err:
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81 raise TemplateSyntaxError(err, filepath, pos[1],
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82 pos[2] + (err.offset or 0))
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83 else:
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84 textbuf.append(chunk)
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85 if textpos is None:
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86 textpos = tuple(pos)
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87
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88 if '\n' in chunk:
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89 lines = chunk.splitlines()
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90 pos[1] += len(lines) - 1
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91 pos[2] += len(lines[-1])
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92 else:
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93 pos[2] += len(chunk)
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94
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95
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96 def lex(text, textpos, filepath):
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97 offset = pos = 0
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98 end = len(text)
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99 escaped = False
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100
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101 while 1:
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102 if escaped:
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103 offset = text.find(PREFIX, offset + 2)
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104 escaped = False
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105 else:
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106 offset = text.find(PREFIX, pos)
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107 if offset < 0 or offset == end - 1:
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108 break
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109 next = text[offset + 1]
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110
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111 if next == '{':
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112 if offset > pos:
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113 yield False, text[pos:offset]
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114 pos = offset + 2
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115 level = 1
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116 while level:
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117 match = token_re.match(text, pos)
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118 if match is None or not match.group():
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119 # if there isn't a match or the match is the empty
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120 # string, we're not going to match up braces ever
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121 raise TemplateSyntaxError('invalid syntax', filepath,
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122 *textpos[1:])
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123 pos = match.end()
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124 tstart, tend = match.regs[3]
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125 token = text[tstart:tend]
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126 if token == '{':
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127 level += 1
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128 elif token == '}':
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129 level -= 1
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130 yield True, text[offset + 2:pos - 1]
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131
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132 elif next in NAMESTART:
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133 if offset > pos:
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134 yield False, text[pos:offset]
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135 pos = offset
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136 pos += 1
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137 while pos < end:
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138 char = text[pos]
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139 if char not in NAMECHARS:
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140 break
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141 pos += 1
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142 yield True, text[offset + 1:pos].strip()
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143
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144 elif not escaped and next == PREFIX:
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145 if offset > pos:
8779b2a775d9 Fix interpolation of short-form expressions that include literal text before the expression. Thanks to Alec for reporting the issue.
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146 yield False, text[pos:offset]
407
f37d8e6acdf2 Move string interpolation code into separate module (`genshi.template.interpolation`).
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147 escaped = True
f37d8e6acdf2 Move string interpolation code into separate module (`genshi.template.interpolation`).
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148 pos = offset + 1
f37d8e6acdf2 Move string interpolation code into separate module (`genshi.template.interpolation`).
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149
f37d8e6acdf2 Move string interpolation code into separate module (`genshi.template.interpolation`).
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150 else:
f37d8e6acdf2 Move string interpolation code into separate module (`genshi.template.interpolation`).
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151 yield False, text[pos:offset + 1]
f37d8e6acdf2 Move string interpolation code into separate module (`genshi.template.interpolation`).
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152 pos = offset + 1
f37d8e6acdf2 Move string interpolation code into separate module (`genshi.template.interpolation`).
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153
f37d8e6acdf2 Move string interpolation code into separate module (`genshi.template.interpolation`).
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154 if pos < end:
f37d8e6acdf2 Move string interpolation code into separate module (`genshi.template.interpolation`).
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155 yield False, text[pos:]
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