Mercurial > genshi > genshi-test

annotate genshi/template/plugin.py @ 395:55cf81951686 experimental-inline

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inline branch: Merged [439:479/trunk].
author cmlenz
date Thu, 28 Dec 2006 18:17:10 +0000
parents 0fc758cb3a02
children 0742f421caba
rev   line source
336
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1 # -*- coding: utf-8 -*-
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2 #
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3 # Copyright (C) 2006 Edgewall Software
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4 # Copyright (C) 2006 Matthew Good
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5 # All rights reserved.
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6 #
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7 # This software is licensed as described in the file COPYING, which
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8 # you should have received as part of this distribution. The terms
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9 # are also available at http://genshi.edgewall.org/wiki/License.
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10 #
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11 # This software consists of voluntary contributions made by many
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12 # individuals. For the exact contribution history, see the revision
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13 # history and logs, available at http://genshi.edgewall.org/log/.
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14
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15 """Basic support for the template engine plugin API used by TurboGears and
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16 CherryPy/Buffet.
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17 """
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18
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19 from pkg_resources import resource_filename
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20
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21 from genshi.input import ET, HTML, XML
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22 from genshi.output import DocType
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23 from genshi.template.core import Context, Template
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24 from genshi.template.eval import Undefined
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25 from genshi.template.loader import TemplateLoader
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26 from genshi.template.markup import MarkupTemplate
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27 from genshi.template.text import TextTemplate
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28
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29 __all__ = ['ConfigurationError', 'MarkupTemplateEnginePlugin',
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30 'TextTemplateEnginePlugin']
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31
336
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32
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33 class ConfigurationError(Exception):
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34 """Exception raised when invalid plugin options are encountered."""
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35
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36
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37 class AbstractTemplateEnginePlugin(object):
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38 """Implementation of the plugin API."""
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39
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40 template_class = None
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41 extension = None
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42
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43 def __init__(self, extra_vars_func=None, options=None):
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44 self.get_extra_vars = extra_vars_func
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45 if options is None:
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46 options = {}
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47 self.options = options
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48
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49 self.default_encoding = options.get('genshi.default_encoding', 'utf-8')
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50 auto_reload = options.get('genshi.auto_reload', '1')
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51 if isinstance(auto_reload, basestring):
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52 auto_reload = auto_reload.lower() in ('1', 'on', 'yes', 'true')
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53 search_path = options.get('genshi.search_path', '').split(':')
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54 try:
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55 max_cache_size = int(options.get('genshi.max_cache_size', 25))
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56 except ValueError:
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57 raise ConfigurationError('Invalid value for max_cache_size: "%s"' %
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58 options.get('genshi.max_cache_size'))
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59
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60 self.loader = TemplateLoader(filter(None, search_path),
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61 auto_reload=auto_reload,
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62 max_cache_size=max_cache_size,
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63 default_class=self.template_class)
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64
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65 def load_template(self, templatename, template_string=None):
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66 """Find a template specified in python 'dot' notation, or load one from
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67 a string.
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68 """
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69 if template_string is not None:
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70 return self.template_class(template_string)
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71
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72 divider = templatename.rfind('.')
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73 if divider >= 0:
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74 package = templatename[:divider]
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75 basename = templatename[divider + 1:] + self.extension
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76 templatename = resource_filename(package, basename)
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77
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78 return self.loader.load(templatename)
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79
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80 def _get_render_options(self, format=None):
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81 if format is None:
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82 format = self.default_format
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83 kwargs = {'method': format}
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84 if self.default_encoding:
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85 kwargs['encoding'] = self.default_encoding
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86 return kwargs
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87
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88 def render(self, info, format=None, fragment=False, template=None):
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89 """Render the template to a string using the provided info."""
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90 kwargs = self._get_render_options(format=format)
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91 return self.transform(info, template).render(**kwargs)
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92
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93 def transform(self, info, template):
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94 """Render the output to an event stream."""
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95 if not isinstance(template, Template):
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96 template = self.load_template(template)
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97 ctxt = Context(**info)
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98
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99 # Some functions for Kid compatibility
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100 def defined(name):
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101 return ctxt.get(name, Undefined) is not Undefined
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102 ctxt['defined'] = defined
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103 def value_of(name, default=None):
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104 return ctxt.get(name, default)
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105 ctxt['value_of'] = value_of
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106
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107 return template.generate(ctxt)
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108
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109
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110 class MarkupTemplateEnginePlugin(AbstractTemplateEnginePlugin):
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111 """Implementation of the plugin API for markup templates."""
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112
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113 template_class = MarkupTemplate
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114 extension = '.html'
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115
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116 doctypes = {'html': DocType.HTML, 'html-strict': DocType.HTML_STRICT,
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117 'html-transitional': DocType.HTML_TRANSITIONAL,
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118 'xhtml': DocType.XHTML, 'xhtml-strict': DocType.XHTML_STRICT,
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119 'xhtml-transitional': DocType.XHTML_TRANSITIONAL}
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120
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121 def __init__(self, extra_vars_func=None, options=None):
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122 AbstractTemplateEnginePlugin.__init__(self, extra_vars_func, options)
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123
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124 doctype = self.options.get('genshi.default_doctype')
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125 if doctype and doctype not in self.doctypes:
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126 raise ConfigurationError('Unknown doctype "%s"' % doctype)
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127 self.default_doctype = self.doctypes.get(doctype)
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128
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129 format = self.options.get('genshi.default_format', 'html')
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130 if format not in ('html', 'xhtml', 'xml', 'text'):
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131 raise ConfigurationError('Unknown output format "%s"' % format)
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132 self.default_format = format
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133
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134 def _get_render_options(self, format=None):
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135 kwargs = super(MarkupTemplateEnginePlugin,
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136 self)._get_render_options(format)
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137 if self.default_doctype:
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138 kwargs['doctype'] = self.default_doctype
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139 return kwargs
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140
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141 def transform(self, info, template):
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142 """Render the output to an event stream."""
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143 data = {'ET': ET, 'HTML': HTML, 'XML': XML}
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144 if self.get_extra_vars:
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145 data.update(self.get_extra_vars())
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146 data.update(info)
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147 return super(MarkupTemplateEnginePlugin, self).transform(data, template)
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148
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149
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150 class TextTemplateEnginePlugin(AbstractTemplateEnginePlugin):
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151 """Implementation of the plugin API for text templates."""
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152
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153 template_class = TextTemplate
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154 extension = '.txt'
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155 default_format = 'text'
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