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annotate libervia/pages/_browser/template.py @ 1306:c07112ef01cd

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browser (template): adapted filters/global/extensions to manage SàT templates: `template` module has been update so most SàT template can be run from browser: - `profile` and `csrf_token` are set as globals - an implementation of `xmlattr` filter has been added - `date_fmt` filter has been implemented using `moment.js` - i18n method `_` has been added to globals, and `{% trans %}` statement has been implemented using an extension. For now they are not actually translating but just returning the unmodified string. - new `get_args` helper method to handle `nunjucks` convention for arguments. - fixed `get_elt` to only return the first child element (avoiding any text child) + added a defaut value for `context`
author Goffi <goffi@goffi.org>
date Thu, 16 Jul 2020 09:08:50 +0200
parents 8aba2a2078ca
children 3411ec23c389
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1 """Integrate templating system using nunjucks"""
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2
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3 from js_modules.nunjucks import nunjucks
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4 from browser import window, document
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5 import javascript
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6
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7
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8 safe = nunjucks.runtime.SafeString.new
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9 env = nunjucks.configure(
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10 window.templates_root_url,
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11 {
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12 'autoescape': True,
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13 'trimBlocks': True,
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14 'lstripBlocks': True,
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15 })
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16
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17 nunjucks.installJinjaCompat()
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18 env.addGlobal("profile", window.profile)
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19 env.addGlobal("csrf_token", window.csrf_token)
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20 # FIXME: integrate gettext or equivalent here
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21 env.addGlobal("_", lambda txt: txt)
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22
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23
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24 class Indexer:
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25 """Index global to a page"""
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26
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27 def __init__(self):
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28 self._indexes = {}
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29
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30 def next(self, value):
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31 if value not in self._indexes:
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32 self._indexes[value] = 0
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33 return 0
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34 self._indexes[value] += 1
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35 return self._indexes[value]
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36
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37 def current(self, value):
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38 return self._indexes.get(value)
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39
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40
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41 gidx = Indexer()
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42 # suffix use to avoid collision with IDs generated in static page
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43 SCRIPT_SUFF = "__script__"
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44
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45 def escape_html(txt):
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46 return (
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47 txt
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48 .replace('&', '&amp;')
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49 .replace('<', '&lt;')
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50 .replace('>', '&gt;')
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51 .replace('"', '&quot;')
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52 )
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53
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54
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55 def get_args(n_args, *sig_args, **sig_kwargs):
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56 """Retrieve function args when they are transmitted using nunjucks convention
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57
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58 cf. https://mozilla.github.io/nunjucks/templating.html#keyword-arguments
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59 @param n_args: argument from nunjucks call
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60 @param sig_args: expected positional arguments
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61 @param sig_kwargs: expected keyword arguments
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62 @return: all expected arguments, with default value if not specified in nunjucks
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63 """
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64 # nunjucks set kwargs in last argument
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65 given_args = list(n_args)
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66 try:
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67 given_kwargs = given_args.pop().to_dict()
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68 except (AttributeError, IndexError):
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69 # we don't have a dict as last argument
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70 # that happens when there is no keyword argument
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71 given_args = list(n_args)
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72 given_kwargs = {}
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73 ret = given_args[:len(sig_args)]
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74 # we check if we have remaining positional arguments
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75 # in which case they may be specified in keyword arguments
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76 for name in sig_args[len(given_args):]:
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77 try:
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78 value = given_kwargs.pop(name)
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79 except KeyError:
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80 raise ValueError(f"missing positional arguments {name!r}")
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81 ret.append(value)
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82
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83 extra_pos_args = given_args[len(sig_args):]
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84 # and now the keyword arguments
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85 for name, default in sig_kwargs.items():
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86 if extra_pos_args:
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87 # kw args has been specified with a positional argument
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88 ret.append(extra_pos_args.pop(0))
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89 continue
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90 value = given_kwargs.get(name, default)
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91 ret.append(value)
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92
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93 return ret
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94
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95
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96 def _next_gidx(value):
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97 """Use next current global index as suffix"""
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98 next_ = gidx.next(value)
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99 return f"{value}{SCRIPT_SUFF}" if next_ == 0 else f"{value}_{SCRIPT_SUFF}{next_}"
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100
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101 env.addFilter("next_gidx", _next_gidx)
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102
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103
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104 def _cur_gidx(value):
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105 """Use current current global index as suffix"""
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106 current = gidx.current(value)
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107 return f"{value}{SCRIPT_SUFF}" if not current else f"{value}_{SCRIPT_SUFF}{current}"
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108
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109 env.addFilter("cur_gidx", _cur_gidx)
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110
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111
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112 def _xmlattr(d, autospace=True):
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113 if not d:
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114 return
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115 d = d.to_dict()
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116 ret = [''] if autospace else []
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117 for key, value in d.items():
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118 if value is not None:
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119 ret.append(f'{escape_html(key)}="{escape_html(str(value))}"')
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120
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121 return safe(' '.join(ret))
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122
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123 env.addFilter("xmlattr", _xmlattr)
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124
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125
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126 def _tojson(value):
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127 return safe(escape_html(window.JSON.stringify(value)))
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128
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129 env.addFilter("tojson", _tojson)
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130
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131
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132 def _icon_use(name, cls=""):
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133 kwargs = cls.to_dict()
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134 cls = kwargs.get('cls')
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135 return safe(
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136 '<svg class="svg-icon{cls}" xmlns="http://www.w3.org/2000/svg" '
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137 'viewBox="0 0 100 100">\n'
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138 ' <use href="#{name}"/>'
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139 '</svg>\n'.format(name=name, cls=(" " + cls) if cls else "")
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140 )
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141
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142 env.addGlobal("icon", _icon_use)
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143
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144
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145 def _date_fmt(
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146 timestamp, *args
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147 ):
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148 """Date formatting
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149
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150 cf. sat.tools.common.date_utils for arguments details
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151 """
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152 fmt, date_only, auto_limit, auto_old_fmt, auto_new_fmt = get_args(
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153 args, fmt="short", date_only=False, auto_limit=7, auto_old_fmt="short",
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154 auto_new_fmt="relative",
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155 )
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156 from js_modules.moment import moment
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157 date = moment.unix(timestamp)
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158
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159 if fmt == "auto_day":
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160 fmt, auto_limit, auto_old_fmt, auto_new_fmt = "auto", 0, "short", "HH:mm"
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161 if fmt == "auto":
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162 limit = moment().startOf('day').subtract(auto_limit, 'days')
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163 m_fmt = auto_old_fmt if date < limit else auto_new_fmt
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164
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165 if fmt == "short":
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166 m_fmt = "DD/MM/YY" if date_only else "DD/MM/YY HH:mm"
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167 elif fmt == "medium":
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168 m_fmt = "ll" if date_only else "lll"
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169 elif fmt == "long":
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170 m_fmt = "LL" if date_only else "LLL"
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171 elif fmt == "full":
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172 m_fmt = "dddd, LL" if date_only else "LLLL"
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173 elif fmt == "relative":
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174 return date.fromNow()
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175 elif fmt == "iso":
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176 if date_only:
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177 m_fmt == "YYYY-MM-DD"
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178 else:
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179 return date.toISOString()
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180 else:
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181 raise NotImplementedError("free format is not implemented yet")
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182
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183 return date.format(m_fmt)
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184
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185 env.addFilter("date_fmt", _date_fmt)
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186
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187
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188 class I18nExtension:
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189 """Extension to handle the {% trans %}{% endtrans %} statement"""
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190 # FIXME: for now there is no translation, this extension only returns the string
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191 # unmodified
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192 tags = ['trans']
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193
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194 def parse(self, parser, nodes, lexer):
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195 tok = parser.nextToken()
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196 args = parser.parseSignature(None, True)
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197 parser.advanceAfterBlockEnd(tok.value)
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198 body = parser.parseUntilBlocks('endtrans')
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199 parser.advanceAfterBlockEnd()
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200 return nodes.CallExtension.new(self._js_ext, 'run', args, [body])
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201
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202 def run(self, context, *args):
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203 body = args[-1]
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204 return body()
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205
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206 @classmethod
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207 def install(cls, env):
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208 ext = cls()
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209 ext_dict = {
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210 "tags": ext.tags,
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211 "parse": ext.parse,
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212 "run": ext.run
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213 }
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214 ext._js_ext = javascript.pyobj2jsobj(ext_dict)
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215 env.addExtension(cls.__name__, ext._js_ext)
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216
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217 I18nExtension.install(env)
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218
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219
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220 class Template:
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221
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222 def __init__(self, tpl_name):
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223 self._tpl = env.getTemplate(tpl_name, True)
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224
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225 def render(self, context):
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226 return self._tpl.render(context)
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227
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228 def get_elt(self, context=None):
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229 if context is None:
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230 context = {}
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231 raw_html = self.render(context)
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232 template_elt = document.createElement('template')
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233 template_elt.innerHTML = raw_html
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234 return template_elt.content.firstElementChild