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annotate src/tools/common/template.py @ 2394:7bfcc431f66d

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template: added media_path to template data
author Goffi <goffi@goffi.org>
date Fri, 27 Oct 2017 08:36:24 +0200
parents 07e1543d6992
children 221478058d8a
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._indexes = {}
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130
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131 def next(self, value):
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132 if value not in self._indexes:
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133 self._indexes[value] = 0
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134 return 0
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135 self._indexes[value] += 1
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136 return self._indexes[value]
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137
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138 def current(self, value):
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139 return self._indexes.get(value)
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140
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141
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142 class ScriptsHandler(object):
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143
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144 def __init__(self, renderer, template_path, template_root_dir, root_path):
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145 self.renderer = renderer
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146 self.template_root_dir = template_root_dir
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147 self.root_path = root_path
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148 self.scripts = [] # we don't use a set because order may be important
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149 dummy, self.theme, self.is_default_theme = renderer.getThemeData(template_path)
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150
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151 def include(self, library_name):
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152 """Mark that a script need to be imported.
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153
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154 Must be used before base.html is extended, as <script> are generated there.
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155 If called several time with the same library, it will be imported once.
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156 @param library_name(unicode): name of the library to import
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157 """
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158 if library_name.endswith('.js'):
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159 library_name = library_name[:-3]
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160 if library_name not in self.scripts:
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161 self.scripts.append(library_name)
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162 return u''
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163
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164 def generate_scripts(self):
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165 """Generate the <script> elements
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166
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167 @return (unicode): <scripts> HTML tags
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168 """
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169 scripts = []
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170 tpl = u'<script src={src}></script>'
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171 for library in self.scripts:
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172 path = self.renderer.getStaticPath(library, self.template_root_dir, self.theme, self.is_default_theme, '.js')
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173 if path is None:
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174 log.warning(_(u"Can't find {}.js javascript library").format(library))
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175 continue
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176 path = os.path.join(self.root_path, path)
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177 scripts.append(tpl.format(src=quoteattr(path)))
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178 return safe(u'\n'.join(scripts))
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179
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180
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181 class Renderer(object):
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182
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183 def __init__(self, host):
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184 self.host = host
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185 self.base_dir = os.path.dirname(sat_templates.__file__) # FIXME: should be modified if we handle use extra dirs
2159
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186 self.env = jinja2.Environment(
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187 loader=TemplateLoader(),
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188 autoescape=jinja2.select_autoescape(['html', 'xhtml', 'xml']),
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189 trim_blocks=True,
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190 lstrip_blocks=True,
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191 extensions=['jinja2.ext.i18n'],
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192 )
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193 self._locale_str = DEFAULT_LOCALE
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194 self._locale = Locale.parse(self._locale_str)
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195 self.installTranslations()
2159
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196 # we want to have access to SàT constants in templates
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197 self.env.globals[u'C'] = C
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198 # custom filters
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199 self.env.filters['next_gidx'] = self._next_gidx
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200 self.env.filters['cur_gidx'] = self._cur_gidx
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084a75b8aa7a tools (common/template): changed blog_date filter to date_days
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diff changeset
201 self.env.filters['date_days'] = self._date_days
2384
d14c1a3e3244 template: new "xmlui_class" filter compute class names from name/values of requested fields.
Goffi <goffi@goffi.org>
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diff changeset
202 self.env.filters['xmlui_class'] = self._xmlui_class
2391
07e1543d6992 template: new "adv_format" filter which use Python's format and return whole value if template is None
Goffi <goffi@goffi.org>
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diff changeset
203 self.env.filters['adv_format'] = self._adv_format
2159
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diff changeset
204
2249
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diff changeset
205 def installTranslations(self):
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diff changeset
206 i18n_dir = os.path.join(self.base_dir, 'i18n')
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diff changeset
207 self.translations = {}
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diff changeset
208 for lang_dir in os.listdir(i18n_dir):
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diff changeset
209 lang_path = os.path.join(i18n_dir, lang_dir)
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diff changeset
210 if not os.path.isdir(lang_path):
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diff changeset
211 continue
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diff changeset
212 po_path = os.path.join(lang_path, 'LC_MESSAGES/sat.mo')
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diff changeset
213 try:
e572482f6cbd core (tools/common/template): i18n support
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diff changeset
214 with open(po_path, 'rb') as f:
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diff changeset
215 self.translations[Locale.parse(lang_dir)] = support.Translations(f, 'sat')
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diff changeset
216 except EnvironmentError:
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diff changeset
217 log.error(_(u"Can't find template translation at {path}").format(path = po_path))
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diff changeset
218 except UnknownLocaleError as e:
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diff changeset
219 log.error(_(u"Invalid locale name: {msg}").format(msg=e))
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diff changeset
220 else:
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diff changeset
221 log.info(_(u'loaded {lang} templates translations').format(lang=lang_dir))
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diff changeset
222 self.env.install_null_translations(True)
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diff changeset
223
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diff changeset
224 def setLocale(self, locale_str):
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diff changeset
225 if locale_str == self._locale_str:
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diff changeset
226 return
2323
2dae79990122 template: print warning message and use DEFAULT_LOCALE on bad locale
Goffi <goffi@goffi.org>
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diff changeset
227 try:
2dae79990122 template: print warning message and use DEFAULT_LOCALE on bad locale
Goffi <goffi@goffi.org>
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diff changeset
228 locale = Locale.parse(locale_str)
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diff changeset
229 except ValueError as e:
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diff changeset
230 log.warning(_(u"invalid locale value: {msg}").format(msg=e))
2dae79990122 template: print warning message and use DEFAULT_LOCALE on bad locale
Goffi <goffi@goffi.org>
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diff changeset
231 locale_str = self._locale_str = DEFAULT_LOCALE
2dae79990122 template: print warning message and use DEFAULT_LOCALE on bad locale
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diff changeset
232 locale = Locale.parse(locale_str)
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Goffi <goffi@goffi.org>
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diff changeset
233
2249
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diff changeset
234 locale_str = unicode(locale)
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diff changeset
235 if locale_str != DEFAULT_LOCALE:
e572482f6cbd core (tools/common/template): i18n support
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diff changeset
236 try:
e572482f6cbd core (tools/common/template): i18n support
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diff changeset
237 translations = self.translations[locale]
e572482f6cbd core (tools/common/template): i18n support
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diff changeset
238 except KeyError:
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diff changeset
239 log.warning(_(u"Can't find locale {locale}".format(locale=locale)))
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diff changeset
240 locale_str = DEFAULT_LOCALE
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diff changeset
241 locale = Locale.parse(self._locale_str)
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diff changeset
242 else:
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diff changeset
243 self.env.install_gettext_translations(translations, True)
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diff changeset
244 log.debug(_(u'Switched to {lang}').format(lang=locale.english_name))
e572482f6cbd core (tools/common/template): i18n support
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parents: 2245
diff changeset
245
e572482f6cbd core (tools/common/template): i18n support
Goffi <goffi@goffi.org>
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diff changeset
246 if locale_str == DEFAULT_LOCALE:
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diff changeset
247 self.env.install_null_translations(True)
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diff changeset
248
e572482f6cbd core (tools/common/template): i18n support
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diff changeset
249 self._locale = locale
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diff changeset
250 self._locale_str = locale_str
e572482f6cbd core (tools/common/template): i18n support
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diff changeset
251
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diff changeset
252 def getThemeAndRoot(self, template):
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253 """retrieve theme and root dir of a given tempalte
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diff changeset
254
f472179305a1 tools(templates): workflow improvments:
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diff changeset
255 @param template(unicode): template to parse
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diff changeset
256 @return (tuple[unicode, unicode]): theme and absolute path to theme's root dir
f472179305a1 tools(templates): workflow improvments:
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diff changeset
257 """
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diff changeset
258 theme, dummy = self.env.loader.parse_template(template)
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diff changeset
259 return theme, os.path.join(self.base_dir, theme)
f472179305a1 tools(templates): workflow improvments:
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diff changeset
260
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diff changeset
261 def getStaticPath(self, name, template_root_dir, theme, is_default, ext='.css'):
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diff changeset
262 """retrieve path of a static file if it exists with current theme or default
2169
f472179305a1 tools(templates): workflow improvments:
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diff changeset
263
2245
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diff changeset
264 File will be looked at [theme]/static/[name][ext], and then default
2169
f472179305a1 tools(templates): workflow improvments:
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diff changeset
265 if not found.
2245
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diff changeset
266 @param name(unicode): name of the file to look for
2169
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diff changeset
267 @param template_root_dir(unicode): absolute path to template root used
f472179305a1 tools(templates): workflow improvments:
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diff changeset
268 @param theme(unicode): name of the template theme used
f472179305a1 tools(templates): workflow improvments:
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diff changeset
269 @param is_default(bool): True if theme is the default theme
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270 @return (unicode, None): relative path if found, else None
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271 """
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272 file_ = None
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273 path = os.path.join(theme, C.TEMPLATE_STATIC_DIR, name + ext)
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274 if os.path.exists(os.path.join(template_root_dir, path)):
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275 file_ = path
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276 elif not is_default:
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277 path = os.path.join(C.TEMPLATE_THEME_DEFAULT, C.TEMPLATE_STATIC_DIR, name + ext)
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278 if os.path.exists(os.path.join(template_root_dir, path)):
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279 file_.append(path)
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280 return file_
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281
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282 def getThemeData(self, template_path):
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283 """return template data got from template_path
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284
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285 @return tuple(unicde, unicode, bool):
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286 path_elems: elements of the path
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287 theme: theme of the page
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288 is_default: True if the theme is the default theme
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289 """
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290 path_elems = template_path.split(u'/')
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291 theme = path_elems.pop(0)
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292 is_default = theme == C.TEMPLATE_THEME_DEFAULT
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293 return (path_elems, theme, is_default)
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294
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295 def getCSSFiles(self, template_path, template_root_dir):
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296 """retrieve CSS files to use according to theme and template path
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297
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298 for each element of the path, a .css file is looked for in /static, and returned if it exists.
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299 previous element are kept by replacing '/' with '_', and styles.css is always returned.
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300 For instance, if template_path is some_theme/blog/articles.html:
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301 some_theme/static/styles.css is returned if it exists else default/static/styles.css
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302 some_theme/static/blog.css is returned if it exists else default/static/blog.css (if it exists too)
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303 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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304 @param template_path(unicode): relative path to template file (e.g. some_theme/blog/articles.html)
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305 @param template_root_dir(unicode): absolute path of the theme root dir used
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306 @return list[unicode]: relative path to CSS files to use
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307 """
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308 # TODO: some caching would be nice
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309 css_files = []
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310 path_elems, theme, is_default = self.getThemeData(template_path)
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311 for css in (u'fonts', u'styles'):
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312 css_path = self.getStaticPath(css, template_root_dir, theme, is_default)
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313 if css_path is not None:
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314 css_files.append(css_path)
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315
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316 for idx, path in enumerate(path_elems):
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317 css_path = self.getStaticPath(u'_'.join(path_elems[:idx+1]), template_root_dir, theme, is_default)
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318 if css_path is not None:
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319 css_files.append(css_path)
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320
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321 return css_files
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322
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323 @jinja2.contextfilter
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324 def _next_gidx(self, ctx, value):
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325 """Use next current global index as suffix"""
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326 next_ = ctx['gidx'].next(value)
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327 return value if next_ == 0 else u"{}_{}".format(value, next_)
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328
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329 @jinja2.contextfilter
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330 def _cur_gidx(self, ctx, value):
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331 """Use current current global index as suffix"""
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332 current = ctx['gidx'].current(value)
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333 return value if not current else u"{}_{}".format(value, current)
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334
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335 def _date_days(self, timestamp):
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336 return int(time.time() - int(timestamp))/(3600*24)
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337
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338 def attr_escape(self, text):
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339 """escape a text to a value usable as an attribute
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340
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341 remove spaces, and put in lower case
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342 """
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343 return text.strip().lower().replace(' ', '_')
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344
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345 def _xmlui_class(self, xmlui_item, fields):
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346 """return classes computed from XMLUI fields name
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347
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348 will return a string with a series of escaped {name}_{value} separated by spaces.
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349 @param xmlui_item(xmlui.XMLUIPanel): XMLUI containing the widgets to use
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350 @param fields(iterable(unicode)): names of the widgets to use
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351 @return (unicode, None): computer string to use as class attribute value
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352 None if no field was specified
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353 """
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354 classes = []
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355 for name in fields:
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356 escaped_name = self.attr_escape(name)
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357 try:
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358 for value in xmlui_item.widgets[name].values:
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359 classes.append(escaped_name + '_' + self.attr_escape(value))
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360 except KeyError:
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361 log.debug(_(u"ignoring field \"{name}\": it doesn't exists").format(name=name))
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362 continue
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363 return u' '.join(classes) or None
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364
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365 def _adv_format(self, value, template, **kwargs):
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366 """Advancer formatter
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367
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368 like format() method, but take care or special values like None
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369 @param value(unicode): value to format
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370 @param template(None, unicode): template to use with format() method.
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371 It will be formatted using value=value and **kwargs
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372 None to return value unchanged
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373 @return (unicode): formatted value
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374 """
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375 if template is None:
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376 return value
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377 # jinja use string when no special char is used, so we have to convert to unicode
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378 return unicode(template).format(value=value, **kwargs)
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379
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380 def render(self, template, theme=None, locale=DEFAULT_LOCALE, root_path=u'', media_path=u'', css_files=None, css_inline=False, **kwargs):
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381 """render a template
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382
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383 @param template(unicode): template to render (e.g. blog/articles.html)
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384 @param theme(unicode): template theme
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385 @param root_path(unicode): prefix of the path/URL to use for template root
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386 must end with a u'/'
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387 @param media_path(unicode): prefix of the SàT media path/URL to use for template root
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388 must end with a u'/'
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389 @param css_files(list[unicode],None): CSS files to used
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390 CSS files must be in static dir of the template
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391 use None for automatic selection of CSS files based on template category
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392 None is recommended. General static/style.css and theme file name will be used.
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393 @param css_inline(bool): if True, CSS will be embedded in the HTML page
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394 @param **kwargs: variable to transmit to the template
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395 """
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396 if not template:
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397 raise ValueError(u"template can't be empty")
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398 if theme is not None:
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399 # use want to set a theme, we add it to the template path
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400 if template[0] == u'(':
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401 raise ValueError(u"you can't specify theme in template path and in argument at the same time")
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402 elif template[0] == u'/':
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403 raise ValueError(u"you can't specify theme with absolute paths")
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404 template= u'(' + theme + u')' + template
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405 else:
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406 theme, dummy = self.env.loader.parse_template(template)
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407
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408 template_source = self.env.get_template(template)
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409 template_root_dir = os.path.normpath(self.base_dir) # FIXME: should be modified if we handle use extra dirs
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410 # XXX: template_path may have a different theme as first element than theme if a default page is used
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411 template_path = template_source.filename[len(template_root_dir)+1:]
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412
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413 if css_files is None:
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414 css_files = self.getCSSFiles(template_path, template_root_dir)
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415
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416 if css_inline:
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417 css_contents = []
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418 for css_file in css_files:
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419 css_file_path = os.path.join(template_root_dir, css_file)
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420 with open(css_file_path) as f:
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421 css_contents.append(f.read())
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422 if css_contents:
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423 kwargs['css_content'] = '\n'.join(css_contents)
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424
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425 scripts_handler = ScriptsHandler(self, template_path, template_root_dir, root_path)
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426 self.setLocale(locale)
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427 # XXX: theme used in template arguments is the requested theme, which may differ from actual theme
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428 # if the template doesn't exist in the requested theme.
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429 return template_source.render(theme=theme, root_path=root_path, media_path=media_path, css_files=css_files, locale=self._locale, gidx=Indexer(), script=scripts_handler, **kwargs)