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annotate libervia/pages/_browser/template.py @ 1333:3411ec23c389

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browser (template): use nunjucks cache
author Goffi <goffi@goffi.org>
date Fri, 14 Aug 2020 09:31:32 +0200
parents c07112ef01cd
children 106bae41f5c8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 'web': {'useCache': True},
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16 })
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17
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18 nunjucks.installJinjaCompat()
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19 env.addGlobal("profile", window.profile)
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20 env.addGlobal("csrf_token", window.csrf_token)
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21 # FIXME: integrate gettext or equivalent here
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22 env.addGlobal("_", lambda txt: txt)
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23
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24
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25 class Indexer:
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26 """Index global to a page"""
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27
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28 def __init__(self):
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29 self._indexes = {}
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30
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31 def next(self, value):
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32 if value not in self._indexes:
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33 self._indexes[value] = 0
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34 return 0
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35 self._indexes[value] += 1
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36 return self._indexes[value]
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37
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38 def current(self, value):
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39 return self._indexes.get(value)
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40
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41
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42 gidx = Indexer()
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43 # suffix use to avoid collision with IDs generated in static page
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44 SCRIPT_SUFF = "__script__"
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45
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46 def escape_html(txt):
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47 return (
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48 txt
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49 .replace('&', '&amp;')
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50 .replace('<', '&lt;')
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51 .replace('>', '&gt;')
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52 .replace('"', '&quot;')
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53 )
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54
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55
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56 def get_args(n_args, *sig_args, **sig_kwargs):
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57 """Retrieve function args when they are transmitted using nunjucks convention
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58
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59 cf. https://mozilla.github.io/nunjucks/templating.html#keyword-arguments
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60 @param n_args: argument from nunjucks call
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61 @param sig_args: expected positional arguments
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62 @param sig_kwargs: expected keyword arguments
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63 @return: all expected arguments, with default value if not specified in nunjucks
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64 """
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65 # nunjucks set kwargs in last argument
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66 given_args = list(n_args)
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67 try:
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68 given_kwargs = given_args.pop().to_dict()
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69 except (AttributeError, IndexError):
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70 # we don't have a dict as last argument
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71 # that happens when there is no keyword argument
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72 given_args = list(n_args)
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73 given_kwargs = {}
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74 ret = given_args[:len(sig_args)]
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75 # we check if we have remaining positional arguments
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76 # in which case they may be specified in keyword arguments
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77 for name in sig_args[len(given_args):]:
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78 try:
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79 value = given_kwargs.pop(name)
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80 except KeyError:
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81 raise ValueError(f"missing positional arguments {name!r}")
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82 ret.append(value)
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83
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84 extra_pos_args = given_args[len(sig_args):]
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85 # and now the keyword arguments
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86 for name, default in sig_kwargs.items():
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87 if extra_pos_args:
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88 # kw args has been specified with a positional argument
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89 ret.append(extra_pos_args.pop(0))
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90 continue
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91 value = given_kwargs.get(name, default)
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92 ret.append(value)
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93
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94 return ret
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95
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96
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97 def _next_gidx(value):
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98 """Use next current global index as suffix"""
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99 next_ = gidx.next(value)
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100 return f"{value}{SCRIPT_SUFF}" if next_ == 0 else f"{value}_{SCRIPT_SUFF}{next_}"
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101
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102 env.addFilter("next_gidx", _next_gidx)
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103
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104
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105 def _cur_gidx(value):
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106 """Use current current global index as suffix"""
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107 current = gidx.current(value)
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108 return f"{value}{SCRIPT_SUFF}" if not current else f"{value}_{SCRIPT_SUFF}{current}"
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109
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110 env.addFilter("cur_gidx", _cur_gidx)
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111
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112
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113 def _xmlattr(d, autospace=True):
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114 if not d:
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115 return
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116 d = d.to_dict()
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117 ret = [''] if autospace else []
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118 for key, value in d.items():
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119 if value is not None:
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120 ret.append(f'{escape_html(key)}="{escape_html(str(value))}"')
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121
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122 return safe(' '.join(ret))
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123
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124 env.addFilter("xmlattr", _xmlattr)
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125
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126
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127 def _tojson(value):
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128 return safe(escape_html(window.JSON.stringify(value)))
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129
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130 env.addFilter("tojson", _tojson)
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131
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132
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133 def _icon_use(name, cls=""):
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134 kwargs = cls.to_dict()
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135 cls = kwargs.get('cls')
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136 return safe(
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137 '<svg class="svg-icon{cls}" xmlns="http://www.w3.org/2000/svg" '
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138 'viewBox="0 0 100 100">\n'
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139 ' <use href="#{name}"/>'
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140 '</svg>\n'.format(name=name, cls=(" " + cls) if cls else "")
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141 )
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142
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143 env.addGlobal("icon", _icon_use)
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144
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145
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146 def _date_fmt(
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147 timestamp, *args
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148 ):
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149 """Date formatting
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150
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151 cf. sat.tools.common.date_utils for arguments details
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152 """
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153 fmt, date_only, auto_limit, auto_old_fmt, auto_new_fmt = get_args(
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154 args, fmt="short", date_only=False, auto_limit=7, auto_old_fmt="short",
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155 auto_new_fmt="relative",
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156 )
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157 from js_modules.moment import moment
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158 date = moment.unix(timestamp)
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159
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160 if fmt == "auto_day":
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161 fmt, auto_limit, auto_old_fmt, auto_new_fmt = "auto", 0, "short", "HH:mm"
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162 if fmt == "auto":
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163 limit = moment().startOf('day').subtract(auto_limit, 'days')
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164 m_fmt = auto_old_fmt if date < limit else auto_new_fmt
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165
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166 if fmt == "short":
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167 m_fmt = "DD/MM/YY" if date_only else "DD/MM/YY HH:mm"
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168 elif fmt == "medium":
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169 m_fmt = "ll" if date_only else "lll"
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170 elif fmt == "long":
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171 m_fmt = "LL" if date_only else "LLL"
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172 elif fmt == "full":
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173 m_fmt = "dddd, LL" if date_only else "LLLL"
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174 elif fmt == "relative":
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175 return date.fromNow()
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176 elif fmt == "iso":
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177 if date_only:
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178 m_fmt == "YYYY-MM-DD"
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179 else:
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180 return date.toISOString()
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181 else:
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182 raise NotImplementedError("free format is not implemented yet")
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183
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184 return date.format(m_fmt)
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185
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186 env.addFilter("date_fmt", _date_fmt)
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187
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188
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189 class I18nExtension:
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190 """Extension to handle the {% trans %}{% endtrans %} statement"""
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191 # FIXME: for now there is no translation, this extension only returns the string
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192 # unmodified
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193 tags = ['trans']
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194
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195 def parse(self, parser, nodes, lexer):
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196 tok = parser.nextToken()
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197 args = parser.parseSignature(None, True)
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198 parser.advanceAfterBlockEnd(tok.value)
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199 body = parser.parseUntilBlocks('endtrans')
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200 parser.advanceAfterBlockEnd()
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201 return nodes.CallExtension.new(self._js_ext, 'run', args, [body])
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202
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203 def run(self, context, *args):
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204 body = args[-1]
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205 return body()
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206
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207 @classmethod
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208 def install(cls, env):
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209 ext = cls()
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210 ext_dict = {
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211 "tags": ext.tags,
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212 "parse": ext.parse,
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213 "run": ext.run
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214 }
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215 ext._js_ext = javascript.pyobj2jsobj(ext_dict)
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216 env.addExtension(cls.__name__, ext._js_ext)
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217
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218 I18nExtension.install(env)
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219
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220
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221 class Template:
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222
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223 def __init__(self, tpl_name):
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224 self._tpl = env.getTemplate(tpl_name, True)
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225
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226 def render(self, context):
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227 return self._tpl.render(context)
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228
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229 def get_elt(self, context=None):
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230 if context is None:
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231 context = {}
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232 raw_html = self.render(context)
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233 template_elt = document.createElement('template')
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234 template_elt.innerHTML = raw_html
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235 return template_elt.content.firstElementChild