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annotate genshi/template/plugin.py @ 417:359451249ce0 trunk

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filter empty values from the plugin search path
author mgood
date Mon, 12 Mar 2007 21:35:18 +0000
parents afd4a51442fa
children 073640758a42
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 Context, 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', 'MarkupTemplateEnginePlugin',
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29 'TextTemplateEnginePlugin']
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30
336
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31
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32 class ConfigurationError(Exception):
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33 """Exception raised when invalid plugin options are encountered."""
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34
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35
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36 class AbstractTemplateEnginePlugin(object):
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37 """Implementation of the plugin API."""
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38
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39 template_class = None
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40 extension = None
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41
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42 def __init__(self, extra_vars_func=None, options=None):
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43 self.get_extra_vars = extra_vars_func
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44 if options is None:
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45 options = {}
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46 self.options = options
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47
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48 self.default_encoding = options.get('genshi.default_encoding', 'utf-8')
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49 auto_reload = options.get('genshi.auto_reload', '1')
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50 if isinstance(auto_reload, basestring):
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51 auto_reload = auto_reload.lower() in ('1', 'on', 'yes', 'true')
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52 search_path = filter(None, options.get('genshi.search_path', '').split(':'))
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53 self.use_package_naming = not search_path
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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 if self.use_package_naming:
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73 divider = templatename.rfind('.')
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74 if divider >= 0:
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75 package = templatename[:divider]
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76 basename = templatename[divider + 1:] + self.extension
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77 templatename = resource_filename(package, basename)
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78
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79 return self.loader.load(templatename)
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80
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81 def _get_render_options(self, format=None):
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82 if format is None:
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83 format = self.default_format
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84 kwargs = {'method': format}
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85 if self.default_encoding:
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86 kwargs['encoding'] = self.default_encoding
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87 return kwargs
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88
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89 def render(self, info, format=None, fragment=False, template=None):
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90 """Render the template to a string using the provided info."""
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91 kwargs = self._get_render_options(format=format)
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92 return self.transform(info, template).render(**kwargs)
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93
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94 def transform(self, info, template):
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95 """Render the output to an event stream."""
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96 if not isinstance(template, Template):
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97 template = self.load_template(template)
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98 ctxt = Context(**info)
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99
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100 # Some functions for Kid compatibility
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101 def defined(name):
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102 return name in ctxt
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103 ctxt['defined'] = defined
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104 def value_of(name, default=None):
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105 return ctxt.get(name, default)
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106 ctxt['value_of'] = value_of
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107
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108 return template.generate(ctxt)
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109
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110
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111 class MarkupTemplateEnginePlugin(AbstractTemplateEnginePlugin):
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112 """Implementation of the plugin API for markup templates."""
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113
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114 template_class = MarkupTemplate
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115 extension = '.html'
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116
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117 doctypes = {'html': DocType.HTML, 'html-strict': DocType.HTML_STRICT,
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118 'html-transitional': DocType.HTML_TRANSITIONAL,
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119 'xhtml': DocType.XHTML, 'xhtml-strict': DocType.XHTML_STRICT,
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120 'xhtml-transitional': DocType.XHTML_TRANSITIONAL}
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121
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122 def __init__(self, extra_vars_func=None, options=None):
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123 AbstractTemplateEnginePlugin.__init__(self, extra_vars_func, options)
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124
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125 doctype = self.options.get('genshi.default_doctype')
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126 if doctype and doctype not in self.doctypes:
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127 raise ConfigurationError('Unknown doctype "%s"' % doctype)
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128 self.default_doctype = self.doctypes.get(doctype)
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129
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130 format = self.options.get('genshi.default_format', 'html')
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131 if format not in ('html', 'xhtml', 'xml', 'text'):
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132 raise ConfigurationError('Unknown output format "%s"' % format)
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133 self.default_format = format
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134
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135 def _get_render_options(self, format=None):
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136 kwargs = super(MarkupTemplateEnginePlugin,
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137 self)._get_render_options(format)
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138 if self.default_doctype:
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139 kwargs['doctype'] = self.default_doctype
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140 return kwargs
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141
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142 def transform(self, info, template):
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143 """Render the output to an event stream."""
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144 data = {'ET': ET, 'HTML': HTML, 'XML': XML}
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145 if self.get_extra_vars:
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146 data.update(self.get_extra_vars())
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147 data.update(info)
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148 return super(MarkupTemplateEnginePlugin, self).transform(data, template)
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149
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150
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151 class TextTemplateEnginePlugin(AbstractTemplateEnginePlugin):
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152 """Implementation of the plugin API for text templates."""
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153
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154 template_class = TextTemplate
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155 extension = '.txt'
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156 default_format = 'text'
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