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annotate src/tools/common/template.py @ 2297:ad2a8e8b52da

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core (tools/common/regex): new ansiRemove method to remove ANSI escape codes from a string
author Goffi <goffi@goffi.org>
date Sun, 02 Jul 2017 19:53:44 +0200
parents 084a75b8aa7a
children 2dae79990122
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #!/usr/bin/env python2
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2 # -*- coding: utf-8 -*-
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3
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4 # SAT: a jabber client
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5 # Copyright (C) 2009-2016 Jérôme Poisson (goffi@goffi.org)
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6
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7 # This program is free software: you can redistribute it and/or modify
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8 # it under the terms of the GNU Affero General Public License as published by
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9 # the Free Software Foundation, either version 3 of the License, or
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10 # (at your option) any later version.
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11
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12 # This program is distributed in the hope that it will be useful,
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 # GNU Affero General Public License for more details.
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16
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17 # You should have received a copy of the GNU Affero General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20 """ template generation """
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21
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22 from sat.core.constants import Const as C
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23 from sat.core.i18n import _
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24 from sat.core import exceptions
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25 from sat.core.log import getLogger
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26 log = getLogger(__name__)
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27 import os.path
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28 from xml.sax.saxutils import quoteattr
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29 import time
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30 from babel import support
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31 from babel import Locale
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32 from babel.core import UnknownLocaleError
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33 try:
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34 import sat_templates
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35 except ImportError:
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36 raise exceptions.MissingModule(u'sat_templates module is not available, please install it or check your path to use template engine')
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37 else:
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38 sat_templates # to avoid pyflakes warning
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39
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40 try:
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41 import jinja2
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42 except:
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43 raise exceptions.MissingModule(u'Missing module jinja2, please install it from http://jinja.pocoo.org or with pip install jinja2')
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44
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45 from jinja2 import Markup as safe
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46
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47 HTML_EXT = ('html', 'xhtml')
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48 DEFAULT_LOCALE = u'en'
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49 # TODO: handle external path (an additional search path for templates should be settable by user
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50 # TODO: handle absolute URL (should be used for trusted use cases) only (e.g. jp) for security reason
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51
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52
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53 class TemplateLoader(jinja2.FileSystemLoader):
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54
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55 def __init__(self):
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56 searchpath = os.path.dirname(sat_templates.__file__)
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57 super(TemplateLoader, self).__init__(searchpath, followlinks=True)
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58
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59 def parse_template(self, template):
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60 """parse template path and return theme and relative URL
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61
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62 @param template_path(unicode): path to template with parenthesis syntax
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63 @return (tuple[(unicode,None),unicode]): theme and template_path
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64 theme can be None if relative path is used
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65 relative path is the path from search path with theme specified
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66 e.g. default/blog/articles.html
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67 """
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68 if template.startswith(u'('):
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69 try:
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70 theme_end = template.index(u')')
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71 except IndexError:
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72 raise ValueError(u"incorrect theme in template")
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73 theme = template[1:theme_end]
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74 template = template[theme_end+1:]
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75 if not template or template.startswith(u'/'):
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76 raise ValueError(u"incorrect path after template name")
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77 template = os.path.join(theme, template)
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78 elif template.startswith(u'/'):
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79 # absolute path means no template
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80 theme = None
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81 raise NotImplementedError(u'absolute path is not implemented yet')
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82 else:
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83 theme = C.TEMPLATE_THEME_DEFAULT
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84 template = os.path.join(theme, template)
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85 return theme, template
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86
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87 def get_default_template(self, theme, template_path):
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88 """return default template path
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89
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90 @param theme(unicode): theme used
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91 @param template_path(unicode): path to the not found template
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92 @return (unicode, None): default path or None if there is not
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93 """
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94 ext = os.path.splitext(template_path)[1][1:]
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95 path_elems = template_path.split(u'/')
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96 if ext in HTML_EXT:
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97 if path_elems[1] == u'error':
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98 # if an inexisting error page is requested, we return base page
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99 default_path = os.path.join(theme, u'error/base.html')
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100 return default_path
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101 if theme != C.TEMPLATE_THEME_DEFAULT:
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102 # if template doesn't exists for this theme, we try with default
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103 return os.path.join(C.TEMPLATE_THEME_DEFAULT, path_elems[1:])
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104
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105 def get_source(self, environment, template):
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106 """relative path to template dir, with special theme handling
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107
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108 if the path is just relative, "default" theme is used.
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109 The theme can be specified in parenthesis just before the path
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110 e.g.: (some_theme)path/to/template.html
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111 """
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112 theme, template_path = self.parse_template(template)
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113 try:
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114 return super(TemplateLoader, self).get_source(environment, template_path)
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115 except jinja2.exceptions.TemplateNotFound as e:
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116 # in some special cases, a defaut template is returned if nothing is found
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117 if theme is not None:
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118 default_path = self.get_default_template(theme, template_path)
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119 if default_path is not None:
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120 return super(TemplateLoader, self).get_source(environment, default_path)
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121 # if no default template is found, we re-raise the error
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122 raise e
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123
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124
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125 class Indexer(object):
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126 """Index global to a page"""
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127
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128 def __init__(self):
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129 self._idx = 0
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130
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131 def next(self):
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132 self._idx+=1
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133 return self._idx
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134
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135 def current(self):
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136 return self._idx
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137
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138
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139 class ScriptsHandler(object):
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140
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141 def __init__(self, renderer, template_path, template_root_dir, root_path):
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142 self.renderer = renderer
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143 self.template_root_dir = template_root_dir
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144 self.root_path = root_path
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145 self.scripts = [] # we don't use a set because order may be important
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146 dummy, self.theme, self.is_default_theme = renderer.getThemeData(template_path)
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147
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148 def include(self, library_name):
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149 """Mark that a script need to be imported.
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150
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151 Must be used before base.html is extended, as <script> are generated there.
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152 If called several time with the same library, it will be imported once.
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153 @param library_name(unicode): name of the library to import
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154 """
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155 if library_name.endswith('.js'):
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156 library_name = library_name[:-3]
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157 if library_name not in self.scripts:
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158 self.scripts.append(library_name)
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159 return u''
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160
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161 def generate_scripts(self):
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162 """Generate the <script> elements
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163
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164 @return (unicode): <scripts> HTML tags
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165 """
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166 scripts = []
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167 tpl = u'<script src={src}></script>'
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168 for library in self.scripts:
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169 path = self.renderer.getStaticPath(library, self.template_root_dir, self.theme, self.is_default_theme, '.js')
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170 if path is None:
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171 log.warning(_(u"Can't find {}.js javascript library").format(library))
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172 continue
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173 path = os.path.join(self.root_path, path)
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174 scripts.append(tpl.format(src=quoteattr(path)))
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175 return safe(u'\n'.join(scripts))
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176
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177
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178 class Renderer(object):
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179
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180 def __init__(self, host):
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181 self.host = host
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182 self.base_dir = os.path.dirname(sat_templates.__file__) # FIXME: should be modified if we handle use extra dirs
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183 self.env = jinja2.Environment(
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184 loader=TemplateLoader(),
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185 autoescape=jinja2.select_autoescape(['html', 'xhtml', 'xml']),
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186 trim_blocks=True,
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187 lstrip_blocks=True,
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188 extensions=['jinja2.ext.i18n'],
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189 )
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190 self._locale_str = DEFAULT_LOCALE
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191 self._locale = Locale.parse(self._locale_str)
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192 self.installTranslations()
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193 # we want to have access to SàT constants in templates
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194 self.env.globals[u'C'] = C
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195 # custom filters
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196 self.env.filters['next_gidx'] = self._next_gidx
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197 self.env.filters['cur_gidx'] = self._cur_gidx
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198 self.env.filters['date_days'] = self._date_days
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199
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200 def installTranslations(self):
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201 i18n_dir = os.path.join(self.base_dir, 'i18n')
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202 self.translations = {}
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203 for lang_dir in os.listdir(i18n_dir):
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204 lang_path = os.path.join(i18n_dir, lang_dir)
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205 if not os.path.isdir(lang_path):
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206 continue
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207 po_path = os.path.join(lang_path, 'LC_MESSAGES/sat.mo')
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208 try:
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209 with open(po_path, 'rb') as f:
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210 self.translations[Locale.parse(lang_dir)] = support.Translations(f, 'sat')
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211 except EnvironmentError:
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212 log.error(_(u"Can't find template translation at {path}").format(path = po_path))
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213 except UnknownLocaleError as e:
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214 log.error(_(u"Invalid locale name: {msg}").format(msg=e))
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215 else:
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216 log.info(_(u'loaded {lang} templates translations').format(lang=lang_dir))
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217 self.env.install_null_translations(True)
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218
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219 def setLocale(self, locale_str):
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220 if locale_str == self._locale_str:
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221 return
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222 locale = Locale.parse(locale_str)
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223 locale_str = unicode(locale)
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224 if locale_str != DEFAULT_LOCALE:
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225 try:
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226 translations = self.translations[locale]
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227 except KeyError:
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228 log.warning(_(u"Can't find locale {locale}".format(locale=locale)))
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229 locale_str = DEFAULT_LOCALE
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230 locale = Locale.parse(self._locale_str)
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231 else:
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232 self.env.install_gettext_translations(translations, True)
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233 log.debug(_(u'Switched to {lang}').format(lang=locale.english_name))
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234
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235 if locale_str == DEFAULT_LOCALE:
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236 self.env.install_null_translations(True)
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237
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238 self._locale = locale
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239 self._locale_str = locale_str
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240
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241 def getThemeAndRoot(self, template):
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242 """retrieve theme and root dir of a given tempalte
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243
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244 @param template(unicode): template to parse
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245 @return (tuple[unicode, unicode]): theme and absolute path to theme's root dir
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246 """
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247 theme, dummy = self.env.loader.parse_template(template)
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248 return theme, os.path.join(self.base_dir, theme)
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249
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250 def getStaticPath(self, name, template_root_dir, theme, is_default, ext='.css'):
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251 """retrieve path of a static file if it exists with current theme or default
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252
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253 File will be looked at [theme]/static/[name][ext], and then default
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254 if not found.
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255 @param name(unicode): name of the file to look for
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256 @param template_root_dir(unicode): absolute path to template root used
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257 @param theme(unicode): name of the template theme used
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258 @param is_default(bool): True if theme is the default theme
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259 @return (unicode, None): relative path if found, else None
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260 """
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261 file_ = None
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262 path = os.path.join(theme, C.TEMPLATE_STATIC_DIR, name + ext)
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263 if os.path.exists(os.path.join(template_root_dir, path)):
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264 file_ = path
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265 elif not is_default:
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266 path = os.path.join(C.TEMPLATE_THEME_DEFAULT, C.TEMPLATE_STATIC_DIR, name + ext)
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267 if os.path.exists(os.path.join(template_root_dir, path)):
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diff changeset
268 file_.append(path)
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269 return file_
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270
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271 def getThemeData(self, template_path):
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272 """return template data got from template_path
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273
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274 @return tuple(unicde, unicode, bool):
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275 path_elems: elements of the path
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276 theme: theme of the page
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277 is_default: True if the theme is the default theme
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278 """
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279 path_elems = template_path.split(u'/')
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280 theme = path_elems.pop(0)
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281 is_default = theme == C.TEMPLATE_THEME_DEFAULT
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282 return (path_elems, theme, is_default)
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283
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284 def getCSSFiles(self, template_path, template_root_dir):
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285 """retrieve CSS files to use according to theme and template path
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286
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287 for each element of the path, a .css file is looked for in /static, and returned if it exists.
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288 previous element are kept by replacing '/' with '_', and styles.css is always returned.
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289 For instance, if template_path is some_theme/blog/articles.html:
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290 some_theme/static/styles.css is returned if it exists else default/static/styles.css
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291 some_theme/static/blog.css is returned if it exists else default/static/blog.css (if it exists too)
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292 some_theme/static/blog_articles.css is returned if it exists else default/static/blog_articles.css (if it exists too)
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293 @param template_path(unicode): relative path to template file (e.g. some_theme/blog/articles.html)
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294 @param template_root_dir(unicode): absolute path of the theme root dir used
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295 @return list[unicode]: relative path to CSS files to use
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296 """
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297 # TODO: some caching would be nice
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298 css_files = []
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299 path_elems, theme, is_default = self.getThemeData(template_path)
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300 for css in (u'fonts', u'styles'):
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301 css_path = self.getStaticPath(css, template_root_dir, theme, is_default)
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302 if css_path is not None:
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303 css_files.append(css_path)
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304
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305 for idx, path in enumerate(path_elems):
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306 css_path = self.getStaticPath(u'_'.join(path_elems[:idx+1]), template_root_dir, theme, is_default)
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307 if css_path is not None:
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308 css_files.append(css_path)
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309
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310 return css_files
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311
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312 @jinja2.contextfilter
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313 def _next_gidx(self, ctx, value):
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314 """Use next current global index as suffix"""
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315 return u"{}_{}".format(value, ctx['gidx'].next())
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316
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317 @jinja2.contextfilter
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318 def _cur_gidx(self, ctx, value):
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319 """Use current current global index as suffix"""
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320 return u"{}_{}".format(value, ctx['gidx'].current())
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321
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322 def _date_days(self, timestamp):
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323 return int(time.time() - int(timestamp))/(3600*24)
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324
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325 def render(self, template, theme=None, locale=DEFAULT_LOCALE, root_path=u'', css_files=None, css_inline=False, **kwargs):
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326 """render a template
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327
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328 @param template(unicode): template to render (e.g. blog/articles.html)
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329 @param theme(unicode): template theme
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330 @param root_path(unicode): prefix of the path/URL to use for template root
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331 must end with a u'/'
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332 @param css_files(list[unicode],None): CSS files to used
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333 CSS files must be in static dir of the template
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334 use None for automatic selection of CSS files based on template category
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335 None is recommended. General static/style.css and theme file name will be used.
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336 @param css_inline(bool): if True, CSS will be embedded in the HTML page
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337 @param **kwargs: variable to transmit to the template
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338 """
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339 if not template:
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340 raise ValueError(u"template can't be empty")
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341 if theme is not None:
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342 # use want to set a theme, we add it to the template path
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343 if template[0] == u'(':
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344 raise ValueError(u"you can't specify theme in template path and in argument at the same time")
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345 elif template[0] == u'/':
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346 raise ValueError(u"you can't specify theme with absolute paths")
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347 template= u'(' + theme + u')' + template
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348 else:
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349 theme, dummy = self.env.loader.parse_template(template)
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350
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351 template_source = self.env.get_template(template)
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352 template_root_dir = os.path.normpath(self.base_dir) # FIXME: should be modified if we handle use extra dirs
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353 # XXX: template_path may have a different theme as first element than theme if a default page is used
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354 template_path = template_source.filename[len(template_root_dir)+1:]
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355
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356 if css_files is None:
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357 css_files = self.getCSSFiles(template_path, template_root_dir)
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358
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359 if css_inline:
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360 css_contents = []
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361 for css_file in css_files:
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362 css_file_path = os.path.join(template_root_dir, css_file)
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363 with open(css_file_path) as f:
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364 css_contents.append(f.read())
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365 if css_contents:
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366 kwargs['css_content'] = '\n'.join(css_contents)
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367
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368 scripts_handler = ScriptsHandler(self, template_path, template_root_dir, root_path)
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369 self.setLocale(locale)
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370 # XXX: theme used in template arguments is the requested theme, which may differ from actual theme
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371 # if the template doesn't exist in the requested theme.
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372 return template_source.render(theme=theme, root_path=root_path, css_files=css_files, locale=self._locale, gidx=Indexer(), script=scripts_handler, **kwargs)