Mercurial > genshi > genshi-test

annotate genshi/template/plugin.py @ 538:19c7dc1e4dd5

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Add `loader_callback` option to plugin interface as requested in #130.
author cmlenz
date Thu, 28 Jun 2007 17:04:54 +0000
parents dafc6f4c20fb
children 6e21c89d9255
rev   line source
336
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1 # -*- coding: utf-8 -*-
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2 #
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3 # Copyright (C) 2006-2007 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.base import Template
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24 from genshi.template.loader import TemplateLoader
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25 from genshi.template.markup import MarkupTemplate
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26 from genshi.template.text import TextTemplate
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27
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28 __all__ = ['ConfigurationError', 'AbstractTemplateEnginePlugin',
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29 'MarkupTemplateEnginePlugin', 'TextTemplateEnginePlugin']
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30 __docformat__ = 'restructuredtext en'
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31
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32
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33 class ConfigurationError(ValueError):
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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 = filter(None, options.get('genshi.search_path', '').split(':'))
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54 self.use_package_naming = not search_path
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55 try:
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56 max_cache_size = int(options.get('genshi.max_cache_size', 25))
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57 except ValueError:
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58 raise ConfigurationError('Invalid value for max_cache_size: "%s"' %
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59 options.get('genshi.max_cache_size'))
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60
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61 loader_callback = options.get('genshi.loader_callback', None)
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62 if loader_callback and not callable(loader_callback):
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63 raise ConfigurationError('loader callback must be a function')
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64
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65 lookup_errors = options.get('genshi.lookup_errors', 'lenient')
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66 if lookup_errors not in ('lenient', 'strict'):
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67 raise ConfigurationError('Unknown lookup errors mode "%s"' %
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68 lookup_errors)
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69
336
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70 self.loader = TemplateLoader(filter(None, search_path),
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71 auto_reload=auto_reload,
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72 max_cache_size=max_cache_size,
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73 default_class=self.template_class,
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74 variable_lookup=lookup_errors,
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75 callback=loader_callback)
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76
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77 def load_template(self, templatename, template_string=None):
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78 """Find a template specified in python 'dot' notation, or load one from
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79 a string.
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80 """
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81 if template_string is not None:
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82 return self.template_class(template_string)
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83
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84 if self.use_package_naming:
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85 divider = templatename.rfind('.')
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86 if divider >= 0:
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87 package = templatename[:divider]
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88 basename = templatename[divider + 1:] + self.extension
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89 templatename = resource_filename(package, basename)
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90
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91 return self.loader.load(templatename)
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92
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93 def _get_render_options(self, format=None):
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94 if format is None:
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95 format = self.default_format
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96 kwargs = {'method': format}
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97 if self.default_encoding:
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98 kwargs['encoding'] = self.default_encoding
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99 return kwargs
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100
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101 def render(self, info, format=None, fragment=False, template=None):
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102 """Render the template to a string using the provided info."""
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103 kwargs = self._get_render_options(format=format)
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104 return self.transform(info, template).render(**kwargs)
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105
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106 def transform(self, info, template):
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107 """Render the output to an event stream."""
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108 if not isinstance(template, Template):
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109 template = self.load_template(template)
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110 return template.generate(**info)
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111
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112
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113 class MarkupTemplateEnginePlugin(AbstractTemplateEnginePlugin):
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114 """Implementation of the plugin API for markup templates."""
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115
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116 template_class = MarkupTemplate
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117 extension = '.html'
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118
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119 def __init__(self, extra_vars_func=None, options=None):
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120 AbstractTemplateEnginePlugin.__init__(self, extra_vars_func, options)
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121
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122 default_doctype = self.options.get('genshi.default_doctype')
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123 if default_doctype:
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124 doctype = DocType.get(default_doctype)
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125 if doctype is None:
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126 raise ConfigurationError('Unknown doctype %r' % default_doctype)
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127 self.default_doctype = doctype
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128 else:
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129 self.default_doctype = None
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130
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131 format = self.options.get('genshi.default_format', 'html').lower()
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132 if format not in ('html', 'xhtml', 'xml', 'text'):
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133 raise ConfigurationError('Unknown output format %r' % format)
336
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134 self.default_format = format
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135
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136 def _get_render_options(self, format=None):
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137 kwargs = super(MarkupTemplateEnginePlugin,
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138 self)._get_render_options(format)
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139 if self.default_doctype:
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140 kwargs['doctype'] = self.default_doctype
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141 return kwargs
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142
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143 def transform(self, info, template):
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144 """Render the output to an event stream."""
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145 data = {'ET': ET, 'HTML': HTML, 'XML': XML}
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146 if self.get_extra_vars:
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147 data.update(self.get_extra_vars())
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148 data.update(info)
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149 return super(MarkupTemplateEnginePlugin, self).transform(data, template)
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150
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151
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152 class TextTemplateEnginePlugin(AbstractTemplateEnginePlugin):
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153 """Implementation of the plugin API for text templates."""
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154
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155 template_class = TextTemplate
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156 extension = '.txt'
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157 default_format = 'text'
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