Mercurial > genshi > genshi-test
annotate genshi/template/plugin.py @ 935:705727288d7e
Merge r1143 from py3k:
add support for python 3 to remaining genshi.template components:
* minor changes to track encoding=None API change in core genshi modules.
* genshi/template/directives:
* slightly odd syntax changes to make the 2to3 .next() fixer pick up *stream.next()
* minor test fix for change in behaviour of division (/) in Python 3.
* genshi/template/loader:
* add 'b' to file modes to ensure it's loaded as bytes in Python 3.
* use not isinstance(s, unicode) instead of isinstance(s, str) since the former is correctly converted by 2to3.
author | hodgestar |
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date | Fri, 18 Mar 2011 09:17:52 +0000 |
parents | fbe34d12acde |
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 # 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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Add a new syntax for text templates, which is available alongside the old syntax for now. The new syntax is more poweful and flexible, using Django-style directive notation.
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24 from genshi.template.text import TextTemplate, NewTextTemplate |
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25 |
435 | 26 __all__ = ['ConfigurationError', 'AbstractTemplateEnginePlugin', |
27 'MarkupTemplateEnginePlugin', 'TextTemplateEnginePlugin'] | |
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28 __docformat__ = 'restructuredtext en' |
353 | 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 |
935 | 47 self.default_encoding = options.get('genshi.default_encoding', None) |
353 | 48 auto_reload = options.get('genshi.auto_reload', '1') |
49 if isinstance(auto_reload, basestring): | |
50 auto_reload = auto_reload.lower() in ('1', 'on', 'yes', 'true') | |
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51 search_path = [p for p in |
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52 options.get('genshi.search_path', '').split(':') if p] |
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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"' % |
353 | 58 options.get('genshi.max_cache_size')) |
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59 |
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60 loader_callback = options.get('genshi.loader_callback', None) |
793 | 61 if loader_callback and not hasattr(loader_callback, '__call__'): |
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62 raise ConfigurationError('loader callback must be a function') |
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63 |
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64 lookup_errors = options.get('genshi.lookup_errors', 'strict') |
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65 if lookup_errors not in ('lenient', 'strict'): |
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66 raise ConfigurationError('Unknown lookup errors mode "%s"' % |
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67 lookup_errors) |
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68 |
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69 try: |
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70 allow_exec = bool(options.get('genshi.allow_exec', True)) |
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71 except ValueError: |
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72 raise ConfigurationError('Invalid value for allow_exec "%s"' % |
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73 options.get('genshi.allow_exec')) |
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74 |
859 | 75 self.loader = TemplateLoader([p for p in search_path if p], |
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76 auto_reload=auto_reload, |
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77 max_cache_size=max_cache_size, |
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78 default_class=self.template_class, |
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79 variable_lookup=lookup_errors, |
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80 allow_exec=allow_exec, |
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81 callback=loader_callback) |
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82 |
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83 def load_template(self, templatename, template_string=None): |
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84 """Find a template specified in python 'dot' notation, or load one from |
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85 a string. |
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86 """ |
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87 if template_string is not None: |
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88 return self.template_class(template_string) |
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89 |
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90 if self.use_package_naming: |
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91 divider = templatename.rfind('.') |
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92 if divider >= 0: |
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93 from pkg_resources import resource_filename |
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94 package = templatename[:divider] |
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95 basename = templatename[divider + 1:] + self.extension |
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96 templatename = resource_filename(package, basename) |
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97 |
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98 return self.loader.load(templatename) |
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99 |
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100 def _get_render_options(self, format=None, fragment=False): |
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101 if format is None: |
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102 format = self.default_format |
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103 kwargs = {'method': format} |
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104 if self.default_encoding: |
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105 kwargs['encoding'] = self.default_encoding |
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106 return kwargs |
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107 |
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108 def render(self, info, format=None, fragment=False, template=None): |
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109 """Render the template to a string using the provided info.""" |
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110 kwargs = self._get_render_options(format=format, fragment=fragment) |
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111 return self.transform(info, template).render(**kwargs) |
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112 |
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113 def transform(self, info, template): |
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114 """Render the output to an event stream.""" |
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115 if not isinstance(template, Template): |
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116 template = self.load_template(template) |
428 | 117 return template.generate(**info) |
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118 |
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119 |
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120 class MarkupTemplateEnginePlugin(AbstractTemplateEnginePlugin): |
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121 """Implementation of the plugin API for markup templates.""" |
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122 |
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123 template_class = MarkupTemplate |
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124 extension = '.html' |
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125 |
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126 def __init__(self, extra_vars_func=None, options=None): |
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127 AbstractTemplateEnginePlugin.__init__(self, extra_vars_func, options) |
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128 |
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129 default_doctype = self.options.get('genshi.default_doctype') |
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130 if default_doctype: |
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131 doctype = DocType.get(default_doctype) |
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132 if doctype is None: |
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133 raise ConfigurationError('Unknown doctype %r' % default_doctype) |
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134 self.default_doctype = doctype |
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135 else: |
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136 self.default_doctype = None |
336
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137 |
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138 format = self.options.get('genshi.default_format', 'html').lower() |
336
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139 if format not in ('html', 'xhtml', 'xml', 'text'): |
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140 raise ConfigurationError('Unknown output format %r' % format) |
336
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141 self.default_format = format |
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142 |
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143 def _get_render_options(self, format=None, fragment=False): |
336
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144 kwargs = super(MarkupTemplateEnginePlugin, |
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145 self)._get_render_options(format, fragment) |
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146 if self.default_doctype and not fragment: |
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147 kwargs['doctype'] = self.default_doctype |
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148 return kwargs |
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149 |
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150 def transform(self, info, template): |
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151 """Render the output to an event stream.""" |
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152 data = {'ET': ET, 'HTML': HTML, 'XML': XML} |
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153 if self.get_extra_vars: |
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154 data.update(self.get_extra_vars()) |
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155 data.update(info) |
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156 return super(MarkupTemplateEnginePlugin, self).transform(data, template) |
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157 |
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158 |
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159 class TextTemplateEnginePlugin(AbstractTemplateEnginePlugin): |
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160 """Implementation of the plugin API for text templates.""" |
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161 |
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162 template_class = TextTemplate |
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163 extension = '.txt' |
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164 default_format = 'text' |
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165 |
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166 def __init__(self, extra_vars_func=None, options=None): |
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167 if options is None: |
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168 options = {} |
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169 |
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170 new_syntax = options.get('genshi.new_text_syntax') |
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171 if isinstance(new_syntax, basestring): |
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172 new_syntax = new_syntax.lower() in ('1', 'on', 'yes', 'true') |
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173 if new_syntax: |
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174 self.template_class = NewTextTemplate |
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175 |
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176 AbstractTemplateEnginePlugin.__init__(self, extra_vars_func, options) |