Mercurial > genshi > mirror
annotate genshi/template/interpolation.py @ 719:4bc6741b2811 trunk
Fix copyright years.
author | cmlenz |
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date | Thu, 10 Apr 2008 19:47:27 +0000 |
parents | fc6d9d2a3527 |
children | 8825ac5014b1 |
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1 # -*- coding: utf-8 -*- |
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2 # |
719 | 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 |
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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 from tokenize import tokenprog |
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21 |
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22 from genshi.core import TEXT |
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23 from genshi.template.base import TemplateSyntaxError, EXPR |
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24 from genshi.template.eval import Expression |
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25 |
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26 __all__ = ['interpolate'] |
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27 __docformat__ = 'restructuredtext en' |
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28 |
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29 NAMESTART = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_' |
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30 NAMECHARS = NAMESTART + '.0123456789' |
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31 PREFIX = '$' |
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32 |
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33 def interpolate(text, filepath=None, lineno=-1, offset=0, lookup='strict'): |
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34 """Parse the given string and extract expressions. |
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35 |
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36 This function is a generator that yields `TEXT` events for literal strings, |
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37 and `EXPR` events for expressions, depending on the results of parsing the |
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38 string. |
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39 |
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40 >>> for kind, data, pos in interpolate("hey ${foo}bar"): |
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41 ... print kind, `data` |
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42 TEXT u'hey ' |
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43 EXPR Expression('foo') |
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44 TEXT u'bar' |
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45 |
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46 :param text: the text to parse |
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47 :param filepath: absolute path to the file in which the text was found |
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48 (optional) |
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49 :param lineno: the line number at which the text was found (optional) |
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50 :param offset: the column number at which the text starts in the source |
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51 (optional) |
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52 :param lookup: the variable lookup mechanism; either "lenient" (the |
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53 default), "strict", or a custom lookup class |
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54 :return: a list of `TEXT` and `EXPR` events |
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55 :raise TemplateSyntaxError: when a syntax error in an expression is |
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56 encountered |
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57 """ |
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58 pos = [filepath, lineno, offset] |
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59 |
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60 textbuf = [] |
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61 textpos = None |
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62 for is_expr, chunk in chain(lex(text, pos, filepath), [(True, '')]): |
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63 if is_expr: |
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64 if textbuf: |
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65 yield TEXT, u''.join(textbuf), textpos |
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66 del textbuf[:] |
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67 textpos = None |
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68 if chunk: |
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69 try: |
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70 expr = Expression(chunk.strip(), pos[0], pos[1], |
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71 lookup=lookup) |
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72 yield EXPR, expr, tuple(pos) |
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73 except SyntaxError, err: |
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74 raise TemplateSyntaxError(err, filepath, pos[1], |
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75 pos[2] + (err.offset or 0)) |
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76 else: |
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77 textbuf.append(chunk) |
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78 if textpos is None: |
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79 textpos = tuple(pos) |
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80 |
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81 if '\n' in chunk: |
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82 lines = chunk.splitlines() |
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83 pos[1] += len(lines) - 1 |
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84 pos[2] += len(lines[-1]) |
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85 else: |
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86 pos[2] += len(chunk) |
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87 |
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88 def lex(text, textpos, filepath): |
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89 offset = pos = 0 |
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90 end = len(text) |
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91 escaped = False |
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92 |
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93 while 1: |
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94 if escaped: |
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95 offset = text.find(PREFIX, offset + 2) |
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96 escaped = False |
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97 else: |
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98 offset = text.find(PREFIX, pos) |
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99 if offset < 0 or offset == end - 1: |
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100 break |
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101 next = text[offset + 1] |
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102 |
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103 if next == '{': |
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104 if offset > pos: |
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105 yield False, text[pos:offset] |
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106 pos = offset + 2 |
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107 level = 1 |
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108 while level: |
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109 match = tokenprog.match(text, pos) |
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110 if match is None: |
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111 raise TemplateSyntaxError('invalid syntax', filepath, |
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112 *textpos[1:]) |
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113 pos = match.end() |
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114 tstart, tend = match.regs[3] |
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115 token = text[tstart:tend] |
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116 if token == '{': |
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117 level += 1 |
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118 elif token == '}': |
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119 level -= 1 |
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120 yield True, text[offset + 2:pos - 1] |
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121 |
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122 elif next in NAMESTART: |
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123 if offset > pos: |
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124 yield False, text[pos:offset] |
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125 pos = offset |
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126 pos += 1 |
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127 while pos < end: |
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128 char = text[pos] |
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129 if char not in NAMECHARS: |
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130 break |
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131 pos += 1 |
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132 yield True, text[offset + 1:pos].strip() |
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133 |
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134 elif not escaped and next == PREFIX: |
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135 if offset > pos: |
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136 yield False, text[pos:offset] |
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137 escaped = True |
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138 pos = offset + 1 |
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139 |
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140 else: |
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141 yield False, text[pos:offset + 1] |
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142 pos = offset + 1 |
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143 |
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144 if pos < end: |
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145 yield False, text[pos:] |