Mercurial > genshi > genshi-test

annotate genshi/template/text.py @ 902:09cc3627654c experimental-inline

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Sync `experimental/inline` branch with [source:trunk@1126].
author cmlenz
date Fri, 23 Apr 2010 21:08:26 +0000
parents 1837f39efd6f
children
rev   line source
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1 # -*- coding: utf-8 -*-
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2 #
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3 # Copyright (C) 2006-2009 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 """Plain text templating engine.
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15
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16 This module implements two template language syntaxes, at least for a certain
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17 transitional period. `OldTextTemplate` (aliased to just `TextTemplate`) defines
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18 a syntax that was inspired by Cheetah/Velocity. `NewTextTemplate` on the other
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19 hand is inspired by the syntax of the Django template language, which has more
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20 explicit delimiting of directives, and is more flexible with regards to
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21 white space and line breaks.
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22
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23 In a future release, `OldTextTemplate` will be phased out in favor of
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24 `NewTextTemplate`, as the names imply. Therefore the new syntax is strongly
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25 recommended for new projects, and existing projects may want to migrate to the
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26 new syntax to remain compatible with future Genshi releases.
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27 """
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28
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29 import re
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30
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31 from genshi.core import TEXT
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32 from genshi.template.base import BadDirectiveError, Template, \
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33 TemplateSyntaxError, EXEC, INCLUDE, SUB
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34 from genshi.template.eval import Suite
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35 from genshi.template.directives import *
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36 from genshi.template.directives import Directive
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37 from genshi.template.interpolation import interpolate
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38
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39 __all__ = ['NewTextTemplate', 'OldTextTemplate', 'TextTemplate']
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40 __docformat__ = 'restructuredtext en'
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41
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42
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43 class NewTextTemplate(Template):
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44 r"""Implementation of a simple text-based template engine. This class will
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45 replace `OldTextTemplate` in a future release.
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46
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47 It uses a more explicit delimiting style for directives: instead of the old
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48 style which required putting directives on separate lines that were prefixed
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49 with a ``#`` sign, directives and commenbtsr are enclosed in delimiter pairs
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50 (by default ``{% ... %}`` and ``{# ... #}``, respectively).
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51
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52 Variable substitution uses the same interpolation syntax as for markup
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53 languages: simple references are prefixed with a dollar sign, more complex
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54 expression enclosed in curly braces.
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55
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56 >>> tmpl = NewTextTemplate('''Dear $name,
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57 ...
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58 ... {# This is a comment #}
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59 ... We have the following items for you:
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60 ... {% for item in items %}
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61 ... * ${'Item %d' % item}
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62 ... {% end %}
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63 ... ''')
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64 >>> print(tmpl.generate(name='Joe', items=[1, 2, 3]).render(encoding=None))
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65 Dear Joe,
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66 <BLANKLINE>
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67 <BLANKLINE>
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68 We have the following items for you:
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69 <BLANKLINE>
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70 * Item 1
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71 <BLANKLINE>
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72 * Item 2
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73 <BLANKLINE>
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74 * Item 3
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75 <BLANKLINE>
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76 <BLANKLINE>
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77
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78 By default, no spaces or line breaks are removed. If a line break should
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79 not be included in the output, prefix it with a backslash:
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80
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81 >>> tmpl = NewTextTemplate('''Dear $name,
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82 ...
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83 ... {# This is a comment #}\
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84 ... We have the following items for you:
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85 ... {% for item in items %}\
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86 ... * $item
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87 ... {% end %}\
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88 ... ''')
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89 >>> print(tmpl.generate(name='Joe', items=[1, 2, 3]).render(encoding=None))
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90 Dear Joe,
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91 <BLANKLINE>
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92 We have the following items for you:
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93 * 1
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94 * 2
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95 * 3
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96 <BLANKLINE>
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97
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98 Backslashes are also used to escape the start delimiter of directives and
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99 comments:
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100
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101 >>> tmpl = NewTextTemplate('''Dear $name,
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102 ...
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103 ... \{# This is a comment #}
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104 ... We have the following items for you:
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105 ... {% for item in items %}\
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106 ... * $item
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107 ... {% end %}\
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108 ... ''')
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109 >>> print(tmpl.generate(name='Joe', items=[1, 2, 3]).render(encoding=None))
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110 Dear Joe,
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111 <BLANKLINE>
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112 {# This is a comment #}
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113 We have the following items for you:
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114 * 1
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115 * 2
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116 * 3
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117 <BLANKLINE>
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118
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119 :since: version 0.5
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120 """
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121 directives = [('def', DefDirective),
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122 ('when', WhenDirective),
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123 ('otherwise', OtherwiseDirective),
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124 ('for', ForDirective),
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125 ('if', IfDirective),
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126 ('choose', ChooseDirective),
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127 ('with', WithDirective)]
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128 serializer = 'text'
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129
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130 _DIRECTIVE_RE = r'((?<!\\)%s\s*(\w+)\s*(.*?)\s*%s|(?<!\\)%s.*?%s)'
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131 _ESCAPE_RE = r'\\\n|\\(\\)|\\(%s)|\\(%s)'
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132
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133 def __init__(self, source, filepath=None, filename=None, loader=None,
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134 encoding=None, lookup='strict', allow_exec=False,
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135 delims=('{%', '%}', '{#', '#}')):
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136 self.delimiters = delims
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137 Template.__init__(self, source, filepath=filepath, filename=filename,
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138 loader=loader, encoding=encoding, lookup=lookup)
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139
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140 def _get_delims(self):
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141 return self._delims
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142 def _set_delims(self, delims):
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143 if len(delims) != 4:
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144 raise ValueError('delimiers tuple must have exactly four elements')
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145 self._delims = delims
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146 self._directive_re = re.compile(self._DIRECTIVE_RE % tuple(
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147 [re.escape(d) for d in delims]
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148 ), re.DOTALL)
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149 self._escape_re = re.compile(self._ESCAPE_RE % tuple(
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150 [re.escape(d) for d in delims[::2]]
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151 ))
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152 delimiters = property(_get_delims, _set_delims, """\
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153 The delimiters for directives and comments. This should be a four item tuple
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154 of the form ``(directive_start, directive_end, comment_start,
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155 comment_end)``, where each item is a string.
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156 """)
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157
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158 def _parse(self, source, encoding):
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159 """Parse the template from text input."""
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160 stream = [] # list of events of the "compiled" template
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161 dirmap = {} # temporary mapping of directives to elements
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162 depth = 0
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163
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164 source = source.read()
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165 if isinstance(source, str):
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166 source = source.decode(encoding or 'utf-8', 'replace')
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167 offset = 0
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168 lineno = 1
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169
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170 _escape_sub = self._escape_re.sub
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171 def _escape_repl(mo):
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172 groups = [g for g in mo.groups() if g]
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173 if not groups:
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174 return ''
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175 return groups[0]
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176
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177 for idx, mo in enumerate(self._directive_re.finditer(source)):
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178 start, end = mo.span(1)
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179 if start > offset:
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180 text = _escape_sub(_escape_repl, source[offset:start])
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181 for kind, data, pos in interpolate(text, self.filepath, lineno,
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182 lookup=self.lookup):
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183 stream.append((kind, data, pos))
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184 lineno += len(text.splitlines())
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185
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186 lineno += len(source[start:end].splitlines())
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187 command, value = mo.group(2, 3)
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188
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189 if command == 'include':
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190 pos = (self.filename, lineno, 0)
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191 value = list(interpolate(value, self.filepath, lineno, 0,
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192 lookup=self.lookup))
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193 if len(value) == 1 and value[0][0] is TEXT:
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194 value = value[0][1]
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195 stream.append((INCLUDE, (value, None, []), pos))
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196
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197 elif command == 'python':
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198 if not self.allow_exec:
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199 raise TemplateSyntaxError('Python code blocks not allowed',
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200 self.filepath, lineno)
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201 try:
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202 suite = Suite(value, self.filepath, lineno,
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203 lookup=self.lookup)
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204 except SyntaxError, err:
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205 raise TemplateSyntaxError(err, self.filepath,
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206 lineno + (err.lineno or 1) - 1)
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207 pos = (self.filename, lineno, 0)
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208 stream.append((EXEC, suite, pos))
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209
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210 elif command == 'end':
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211 depth -= 1
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212 if depth in dirmap:
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213 directive, start_offset = dirmap.pop(depth)
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214 substream = stream[start_offset:]
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215 stream[start_offset:] = [(SUB, ([directive], substream),
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216 (self.filepath, lineno, 0))]
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217
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218 elif command:
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219 cls = self.get_directive(command)
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220 if cls is None:
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221 raise BadDirectiveError(command)
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222 directive = 0, cls, value, None, (self.filepath, lineno, 0)
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223 dirmap[depth] = (directive, len(stream))
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224 depth += 1
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225
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226 offset = end
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227
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228 if offset < len(source):
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229 text = _escape_sub(_escape_repl, source[offset:])
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230 for kind, data, pos in interpolate(text, self.filepath, lineno,
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231 lookup=self.lookup):
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232 stream.append((kind, data, pos))
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233
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234 return stream
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235
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236
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237 class OldTextTemplate(Template):
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238 """Legacy implementation of the old syntax text-based templates. This class
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239 is provided in a transition phase for backwards compatibility. New code
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240 should use the `NewTextTemplate` class and the improved syntax it provides.
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241
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242 >>> tmpl = OldTextTemplate('''Dear $name,
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243 ...
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244 ... We have the following items for you:
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245 ... #for item in items
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246 ... * $item
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247 ... #end
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248 ...
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249 ... All the best,
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250 ... Foobar''')
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251 >>> print(tmpl.generate(name='Joe', items=[1, 2, 3]).render(encoding=None))
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252 Dear Joe,
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253 <BLANKLINE>
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254 We have the following items for you:
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255 * 1
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256 * 2
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257 * 3
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258 <BLANKLINE>
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259 All the best,
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260 Foobar
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261 """
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262 directives = [('def', DefDirective),
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263 ('when', WhenDirective),
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264 ('otherwise', OtherwiseDirective),
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265 ('for', ForDirective),
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266 ('if', IfDirective),
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267 ('choose', ChooseDirective),
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268 ('with', WithDirective)]
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269 serializer = 'text'
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270
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271 _DIRECTIVE_RE = re.compile(r'(?:^[ \t]*(?<!\\)#(end).*\n?)|'
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272 r'(?:^[ \t]*(?<!\\)#((?:\w+|#).*)\n?)',
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273 re.MULTILINE)
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274
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275 def _parse(self, source, encoding):
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276 """Parse the template from text input."""
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277 stream = [] # list of events of the "compiled" template
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278 dirmap = {} # temporary mapping of directives to elements
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279 depth = 0
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280
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281 source = source.read()
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282 if isinstance(source, str):
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283 source = source.decode(encoding or 'utf-8', 'replace')
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284 offset = 0
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285 lineno = 1
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286
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287 for idx, mo in enumerate(self._DIRECTIVE_RE.finditer(source)):
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288 start, end = mo.span()
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289 if start > offset:
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290 text = source[offset:start]
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291 for kind, data, pos in interpolate(text, self.filepath, lineno,
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0742f421caba Merged revisions 487-603 via svnmerge from
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diff changeset
292 lookup=self.lookup):
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293 stream.append((kind, data, pos))
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294 lineno += len(text.splitlines())
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295
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296 text = source[start:end].lstrip()[1:]
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297 lineno += len(text.splitlines())
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298 directive = text.split(None, 1)
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299 if len(directive) > 1:
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300 command, value = directive
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301 else:
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302 command, value = directive[0], None
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303
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304 if command == 'end':
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305 depth -= 1
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306 if depth in dirmap:
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307 directive, start_offset = dirmap.pop(depth)
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308 substream = stream[start_offset:]
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309 stream[start_offset:] = [(SUB, ([directive], substream),
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310 (self.filepath, lineno, 0))]
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311 elif command == 'include':
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312 pos = (self.filename, lineno, 0)
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313 stream.append((INCLUDE, (value.strip(), None, []), pos))
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314 elif command != '#':
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315 cls = self.get_directive(command)
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316 if cls is None:
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317 raise BadDirectiveError(command)
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318 directive = 0, cls, value, None, (self.filepath, lineno, 0)
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319 dirmap[depth] = (directive, len(stream))
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320 depth += 1
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321
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322 offset = end
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323
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324 if offset < len(source):
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325 text = source[offset:].replace('\\#', '#')
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326 for kind, data, pos in interpolate(text, self.filepath, lineno,
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327 lookup=self.lookup):
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328 stream.append((kind, data, pos))
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329
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330 return stream
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331
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332
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333 TextTemplate = OldTextTemplate
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