Mercurial > genshi > genshi-test

annotate genshi/template/plugin.py @ 820:1837f39efd6f experimental-inline

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Sync (old) experimental inline branch with trunk@1027.
author cmlenz
date Wed, 11 Mar 2009 17:51:06 +0000
parents 0742f421caba
children 09cc3627654c
rev   line source
336
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1 # -*- coding: utf-8 -*-
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2 #
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3 # Copyright (C) 2006-2008 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 genshi.input import ET, HTML, XML
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20 from genshi.output import DocType
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21 from genshi.template.base import Template
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22 from genshi.template.loader import TemplateLoader
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23 from genshi.template.markup import MarkupTemplate
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24 from genshi.template.text import TextTemplate, NewTextTemplate
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25
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26 __all__ = ['ConfigurationError', 'AbstractTemplateEnginePlugin',
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27 'MarkupTemplateEnginePlugin', 'TextTemplateEnginePlugin']
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28 __docformat__ = 'restructuredtext en'
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29
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30
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31 class ConfigurationError(ValueError):
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32 """Exception raised when invalid plugin options are encountered."""
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33
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34
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35 class AbstractTemplateEnginePlugin(object):
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36 """Implementation of the plugin API."""
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37
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38 template_class = None
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39 extension = None
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40
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41 def __init__(self, extra_vars_func=None, options=None):
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42 self.get_extra_vars = extra_vars_func
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43 if options is None:
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44 options = {}
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45 self.options = options
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46
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47 self.default_encoding = options.get('genshi.default_encoding', 'utf-8')
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48 auto_reload = options.get('genshi.auto_reload', '1')
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49 if isinstance(auto_reload, basestring):
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50 auto_reload = auto_reload.lower() in ('1', 'on', 'yes', 'true')
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51 search_path = filter(None, options.get('genshi.search_path', '').split(':'))
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52 self.use_package_naming = not search_path
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53 try:
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54 max_cache_size = int(options.get('genshi.max_cache_size', 25))
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55 except ValueError:
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56 raise ConfigurationError('Invalid value for max_cache_size: "%s"' %
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57 options.get('genshi.max_cache_size'))
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58
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59 loader_callback = options.get('genshi.loader_callback', None)
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60 if loader_callback and not hasattr(loader_callback, '__call__'):
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61 raise ConfigurationError('loader callback must be a function')
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62
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63 lookup_errors = options.get('genshi.lookup_errors', 'strict')
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64 if lookup_errors not in ('lenient', 'strict'):
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65 raise ConfigurationError('Unknown lookup errors mode "%s"' %
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66 lookup_errors)
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67
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68 try:
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69 allow_exec = bool(options.get('genshi.allow_exec', True))
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70 except ValueError:
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71 raise ConfigurationError('Invalid value for allow_exec "%s"' %
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72 options.get('genshi.allow_exec'))
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73
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74 self.loader = TemplateLoader(filter(None, search_path),
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75 auto_reload=auto_reload,
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76 max_cache_size=max_cache_size,
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77 default_class=self.template_class,
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78 variable_lookup=lookup_errors,
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79 allow_exec=allow_exec,
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80 callback=loader_callback)
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81
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82 def load_template(self, templatename, template_string=None):
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83 """Find a template specified in python 'dot' notation, or load one from
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84 a string.
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85 """
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86 if template_string is not None:
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87 return self.template_class(template_string)
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88
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89 if self.use_package_naming:
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90 divider = templatename.rfind('.')
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91 if divider >= 0:
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92 from pkg_resources import resource_filename
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93 package = templatename[:divider]
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94 basename = templatename[divider + 1:] + self.extension
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95 templatename = resource_filename(package, basename)
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96
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97 return self.loader.load(templatename)
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98
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99 def _get_render_options(self, format=None, fragment=False):
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100 if format is None:
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101 format = self.default_format
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102 kwargs = {'method': format}
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103 if self.default_encoding:
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104 kwargs['encoding'] = self.default_encoding
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105 return kwargs
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106
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107 def render(self, info, format=None, fragment=False, template=None):
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108 """Render the template to a string using the provided info."""
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109 kwargs = self._get_render_options(format=format, fragment=fragment)
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110 return self.transform(info, template).render(**kwargs)
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111
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112 def transform(self, info, template):
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113 """Render the output to an event stream."""
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114 if not isinstance(template, Template):
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115 template = self.load_template(template)
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116 return template.generate(**info)
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117
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118
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119 class MarkupTemplateEnginePlugin(AbstractTemplateEnginePlugin):
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120 """Implementation of the plugin API for markup templates."""
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121
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122 template_class = MarkupTemplate
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123 extension = '.html'
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124
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125 def __init__(self, extra_vars_func=None, options=None):
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126 AbstractTemplateEnginePlugin.__init__(self, extra_vars_func, options)
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127
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128 default_doctype = self.options.get('genshi.default_doctype')
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129 if default_doctype:
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130 doctype = DocType.get(default_doctype)
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131 if doctype is None:
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132 raise ConfigurationError('Unknown doctype %r' % default_doctype)
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133 self.default_doctype = doctype
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134 else:
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135 self.default_doctype = None
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136
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137 format = self.options.get('genshi.default_format', 'html').lower()
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138 if format not in ('html', 'xhtml', 'xml', 'text'):
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139 raise ConfigurationError('Unknown output format %r' % format)
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140 self.default_format = format
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141
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142 def _get_render_options(self, format=None, fragment=False):
336
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143 kwargs = super(MarkupTemplateEnginePlugin,
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144 self)._get_render_options(format, fragment)
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145 if self.default_doctype and not fragment:
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146 kwargs['doctype'] = self.default_doctype
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147 return kwargs
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148
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149 def transform(self, info, template):
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150 """Render the output to an event stream."""
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151 data = {'ET': ET, 'HTML': HTML, 'XML': XML}
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152 if self.get_extra_vars:
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153 data.update(self.get_extra_vars())
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154 data.update(info)
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155 return super(MarkupTemplateEnginePlugin, self).transform(data, template)
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156
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157
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158 class TextTemplateEnginePlugin(AbstractTemplateEnginePlugin):
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159 """Implementation of the plugin API for text templates."""
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160
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161 template_class = TextTemplate
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162 extension = '.txt'
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163 default_format = 'text'
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164
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165 def __init__(self, extra_vars_func=None, options=None):
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166 if options is None:
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167 options = {}
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168
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169 new_syntax = options.get('genshi.new_text_syntax')
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170 if isinstance(new_syntax, basestring):
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171 new_syntax = new_syntax.lower() in ('1', 'on', 'yes', 'true')
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172 if new_syntax:
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173 self.template_class = NewTextTemplate
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174
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175 AbstractTemplateEnginePlugin.__init__(self, extra_vars_func, options)
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