annotate piecrust/templating/jinjaengine.py @ 65:071cc99b1779

Jinja templating now has `spaceless`, `|keys` and `|values`.
author Ludovic Chabant <ludovic@chabant.com>
date Fri, 29 Aug 2014 08:06:43 -0700
parents e3e3de44377c
children e771c202583a
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1 import re
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2 import time
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3 import logging
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4 import strict_rfc3339
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5 from jinja2 import Environment, FileSystemLoader, TemplateNotFound
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6 from jinja2.exceptions import TemplateSyntaxError
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7 from jinja2.ext import Extension, Markup
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071cc99b1779 Jinja templating now has `spaceless`, `|keys` and `|values`.
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8 from jinja2.lexer import Token, describe_token
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9 from jinja2.nodes import CallBlock, Const
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10 from compressinja.html import HtmlCompressor, StreamProcessContext
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11 from pygments import highlight
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12 from pygments.formatters import HtmlFormatter
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13 from pygments.lexers import get_lexer_by_name, guess_lexer
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dc72a288921f Add the `paginate` filter to Jinja, activate `auto_reload`.
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14 from piecrust.data.paginator import Paginator
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15 from piecrust.rendering import format_text
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16 from piecrust.routing import CompositeRouteFunction
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17 from piecrust.templating.base import TemplateEngine, TemplateNotFoundError
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002fa58f54dc Give the proper URL to `Paginator` in the `paginate` filter.
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18 from piecrust.uriutil import multi_replace, get_first_sub_uri
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21 logger = logging.getLogger(__name__)
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23
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24 class JinjaTemplateEngine(TemplateEngine):
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25 # Name `twig` is for backwards compatibility with PieCrust 1.x.
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26 ENGINE_NAMES = ['jinja', 'jinja2', 'twig']
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27 EXTENSIONS = ['jinja', 'jinja2', 'twig']
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28
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29 def __init__(self):
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30 self.env = None
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31
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32 def renderString(self, txt, data, filename=None, line_offset=0):
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33 self._ensureLoaded()
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34 tpl = self.env.from_string(txt)
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35 try:
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36 return tpl.render(data)
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37 except TemplateSyntaxError as tse:
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38 tse.lineno += line_offset
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39 if filename:
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40 tse.filename = filename
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41 import sys
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42 _, __, traceback = sys.exc_info()
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43 raise tse.with_traceback(traceback)
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44
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45 def renderFile(self, paths, data):
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46 self._ensureLoaded()
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47 tpl = None
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48 logger.debug("Looking for template: %s" % paths)
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49 for p in paths:
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50 try:
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51 tpl = self.env.get_template(p)
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52 break
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53 except TemplateNotFound:
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54 pass
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55 if tpl is None:
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56 raise TemplateNotFoundError()
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57 return tpl.render(data)
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58
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59 def _ensureLoaded(self):
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60 if self.env:
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61 return
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62
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63 autoescape = self.app.config.get('jinja/auto_escape')
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64 if autoescape is None:
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65 autoescape = self.app.config.get('twig/auto_escape')
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66 if autoescape is None:
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67 autoescape = True
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68
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69 logger.debug("Creating Jinja environment with folders: %s" %
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70 self.app.templates_dirs)
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71 loader = FileSystemLoader(self.app.templates_dirs)
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72 extensions = [
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73 PieCrustHighlightExtension,
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74 PieCrustCacheExtension,
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75 PieCrustSpacelessExtension]
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76 if autoescape:
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77 extensions.append('jinja2.ext.autoescape')
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78 self.env = PieCrustEnvironment(
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79 self.app,
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80 loader=loader,
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81 extensions=extensions)
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82
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83
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84 class PieCrustEnvironment(Environment):
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85 def __init__(self, app, *args, **kwargs):
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86 super(PieCrustEnvironment, self).__init__(*args, **kwargs)
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87 self.app = app
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88 self.auto_reload = True
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89 self.globals.update({
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90 'fail': raise_exception})
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91 self.filters.update({
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92 'keys': get_dict_keys,
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93 'values': get_dict_values,
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94 'paginate': self._paginate,
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95 'formatwith': self._formatWith,
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96 'markdown': lambda v: self._formatWith(v, 'markdown'),
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97 'textile': lambda v: self._formatWith(v, 'textile'),
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98 'nocache': add_no_cache_parameter,
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99 'wordcount': get_word_count,
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100 'stripoutertag': strip_outer_tag,
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101 'stripslash': strip_slash,
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102 'titlecase': title_case,
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103 'atomdate': get_atom_date,
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104 'date': get_date})
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105 # Backwards compatibility with PieCrust 1.x.
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106 self.globals.update({
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107 'pcfail': raise_exception})
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108
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109 # Backwards compatibility with Twig.
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110 twig_compatibility_mode = app.config.get('jinja/twig_compatibility')
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111 if twig_compatibility_mode is None or twig_compatibility_mode is True:
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112 self.trim_blocks = True
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113 self.filters['raw'] = self.filters['safe']
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114
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115 # Add route functions.
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116 for route in app.routes:
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117 name = route.template_func_name
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118 func = self.globals.get(name)
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119 if func is None:
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120 func = CompositeRouteFunction()
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121 func.addFunc(route)
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122 self.globals[name] = func
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123 elif isinstance(func, CompositeRouteFunction):
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124 self.globals[name].addFunc(route)
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125 else:
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126 raise Exception("Route function '%s' collides with an "
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127 "existing function or template data." %
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128 name)
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129
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130 def _paginate(self, value, items_per_page=5):
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131 cpi = self.app.env.exec_info_stack.current_page_info
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132 if cpi is None or cpi.page is None or cpi.render_ctx is None:
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133 raise Exception("Can't paginate when no page has been pushed "
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134 "on the execution stack.")
48
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135 first_uri = get_first_sub_uri(self.app, cpi.render_ctx.uri)
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diff changeset
136 return Paginator(cpi.page, value, first_uri,
19
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137 page_num=cpi.render_ctx.page_num,
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138 items_per_page=items_per_page)
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139
3
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140 def _formatWith(self, value, format_name):
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141 return format_text(self.app, format_name, value)
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142
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143
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144 def raise_exception(msg):
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145 raise Exception(msg)
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146
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147
65
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148 def get_dict_keys(value):
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149 if isinstance(value, list):
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150 return [i[0] for i in value]
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151 return value.keys()
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152
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153
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154 def get_dict_values(value):
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155 if isinstance(value, list):
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156 return [i[1] for i in value]
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157 return value.values()
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158
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159
3
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160 def add_no_cache_parameter(value, param_name='t', param_value=None):
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161 if not param_value:
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162 param_value = time.time()
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163 if '?' in value:
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164 value += '&'
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165 else:
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166 value += '?'
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167 value += '%s=%s' % (param_name, param_value)
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168 return value
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169
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170
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171 def get_word_count(value):
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172 return len(value.split())
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173
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174
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175 def strip_outer_tag(value, tag=None):
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176 tag_pattern = '[a-z]+[a-z0-9]*'
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177 if tag is not None:
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178 tag_pattern = re.escape(tag)
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179 pat = r'^\<' + tag_pattern + r'\>(.*)\</' + tag_pattern + '>$'
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180 m = re.match(pat, value)
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181 if m:
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182 return m.group(1)
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183 return value
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184
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185
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186 def strip_slash(value):
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187 return value.rstrip('/')
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188
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189
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190 def title_case(value):
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191 return value.title()
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192
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193
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194 def get_atom_date(value):
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195 return strict_rfc3339.timestamp_to_rfc3339_localoffset(int(value))
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196
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197
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198 def get_date(value, fmt):
28
19f3ac27c3d5 The `date` filter now supports passing `"now"` as in Twig.
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parents: 19
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199 if value == 'now':
19f3ac27c3d5 The `date` filter now supports passing `"now"` as in Twig.
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diff changeset
200 value = time.time()
41
1a30e3d7ee47 Error out if `date` filter is used with PHP date formats.
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diff changeset
201 if '%' not in fmt:
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diff changeset
202 suggest = php_format_to_strftime_format(fmt)
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203 raise Exception("PieCrust 1 date formats won't work in PieCrust 2. "
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204 "You probably want a format that look like '%s'. "
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205 "Please check the `strftime` formatting page here: "
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parents: 28
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206 "https://docs.python.org/3/library/datetime.html"
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diff changeset
207 "#strftime-and-strptime-behavior" %
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diff changeset
208 suggest)
3
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209 return time.strftime(fmt, time.localtime(value))
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210
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211
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212 class PieCrustHighlightExtension(Extension):
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213 tags = set(['highlight', 'geshi'])
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214
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215 def __init__(self, environment):
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216 super(PieCrustHighlightExtension, self).__init__(environment)
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217
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218 def parse(self, parser):
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219 lineno = next(parser.stream).lineno
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diff changeset
220
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diff changeset
221 # Extract the language name.
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222 args = [parser.parse_expression()]
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223
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224 # Extract optional arguments.
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225 kwarg_names = {'line_numbers': 0, 'use_classes': 0, 'class': 1, 'id': 1}
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226 kwargs = {}
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diff changeset
227 while not parser.stream.current.test('block_end'):
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228 name = parser.stream.expect('name')
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229 if name.value not in kwarg_names:
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230 raise Exception("'%s' is not a valid argument for the code "
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diff changeset
231 "highlighting tag." % name.value)
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diff changeset
232 if kwarg_names[name.value] == 0:
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233 kwargs[name.value] = Const(True)
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234 elif parser.stream.skip_if('assign'):
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diff changeset
235 kwargs[name.value] = parser.parse_expression()
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236
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diff changeset
237 # body of the block
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238 body = parser.parse_statements(['name:endhighlight', 'name:endgeshi'],
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diff changeset
239 drop_needle=True)
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240
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241 return CallBlock(self.call_method('_highlight', args, kwargs),
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diff changeset
242 [], [], body).set_lineno(lineno)
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243
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244 def _highlight(self, lang, line_numbers=False, use_classes=False,
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diff changeset
245 css_class=None, css_id=None, caller=None):
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diff changeset
246 # Try to be mostly compatible with Jinja2-highlight's settings.
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diff changeset
247 body = caller()
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diff changeset
248
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diff changeset
249 if lang is None:
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250 lexer = guess_lexer(body)
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diff changeset
251 else:
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252 lexer = get_lexer_by_name(lang, stripall=False)
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diff changeset
253
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254 if css_class is None:
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diff changeset
255 try:
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diff changeset
256 css_class = self.environment.jinja2_highlight_cssclass
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diff changeset
257 except AttributeError:
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258 pass
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259
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260 if css_class is not None:
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diff changeset
261 formatter = HtmlFormatter(cssclass=css_class,
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diff changeset
262 linenos=line_numbers)
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diff changeset
263 else:
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264 formatter = HtmlFormatter(linenos=line_numbers)
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265
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266 code = highlight(Markup(body.rstrip()).unescape(), lexer, formatter)
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267 return code
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268
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269
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270 class PieCrustCacheExtension(Extension):
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271 tags = set(['pccache', 'cache'])
3
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272
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273 def __init__(self, environment):
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274 super(PieCrustCacheExtension, self).__init__(environment)
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275
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276 environment.extend(
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277 piecrust_cache_prefix='',
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278 piecrust_cache={}
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279 )
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280
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281 def parse(self, parser):
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282 # the first token is the token that started the tag. In our case
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283 # we only listen to ``'pccache'`` so this will be a name token with
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284 # `pccache` as value. We get the line number so that we can give
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285 # that line number to the nodes we create by hand.
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286 lineno = next(parser.stream).lineno
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287
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288 # now we parse a single expression that is used as cache key.
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289 args = [parser.parse_expression()]
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290
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291 # now we parse the body of the cache block up to `endpccache` and
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292 # drop the needle (which would always be `endpccache` in that case)
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293 body = parser.parse_statements(['name:endpccache', 'name:endcache'],
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294 drop_needle=True)
3
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295
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296 # now return a `CallBlock` node that calls our _cache_support
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297 # helper method on this extension.
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298 return CallBlock(self.call_method('_cache_support', args),
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299 [], [], body).set_lineno(lineno)
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300
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301 def _cache_support(self, name, caller):
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302 key = self.environment.piecrust_cache_prefix + name
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303
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304 # try to load the block from the cache
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305 # if there is no fragment in the cache, render it and store
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306 # it in the cache.
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307 rv = self.environment.piecrust_cache.get(key)
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308 if rv is not None:
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309 return rv
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310 rv = caller()
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311 self.environment.piecrust_cache[key] = rv
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312 return rv
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313
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314
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315 class PieCrustSpacelessExtension(HtmlCompressor):
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316 """ A re-implementation of `SelectiveHtmlCompressor` so that we can
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317 both use `strip` or `spaceless` in templates.
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318 """
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319 def filter_stream(self, stream):
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320 ctx = StreamProcessContext(stream)
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321 strip_depth = 0
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322 while 1:
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323 if stream.current.type == 'block_begin':
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324 for tk in ['strip', 'spaceless']:
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325 change = self._processToken(ctx, stream, tk)
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326 if change != 0:
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327 strip_depth += change
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328 if strip_depth < 0:
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329 ctx.fail('Unexpected tag end%s' % tk)
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330 break
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331 if strip_depth > 0 and stream.current.type == 'data':
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332 ctx.token = stream.current
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333 value = self.normalize(ctx)
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334 yield Token(stream.current.lineno, 'data', value)
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335 else:
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336 yield stream.current
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337 next(stream)
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338
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339 def _processToken(self, ctx, stream, test_token):
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340 change = 0
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341 if (stream.look().test('name:%s' % test_token) or
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342 stream.look().test('name:end%s' % test_token)):
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343 stream.skip()
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344 if stream.current.value == test_token:
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345 change = 1
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346 else:
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347 change = -1
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348 stream.skip()
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349 if stream.current.type != 'block_end':
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350 ctx.fail('expected end of block, got %s' %
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351 describe_token(stream.current))
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352 stream.skip()
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353 return change
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354
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355
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356 def php_format_to_strftime_format(fmt):
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357 replacements = {
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358 'd': '%d',
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359 'D': '%a',
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360 'j': '%d',
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361 'l': '%A',
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362 'w': '%w',
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363 'z': '%j',
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364 'W': '%W',
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365 'F': '%B',
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366 'm': '%m',
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367 'M': '%b',
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368 'n': '%m',
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369 'y': '%Y',
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370 'Y': '%y',
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371 'g': '%I',
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372 'G': '%H',
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373 'h': '%I',
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374 'H': '%H',
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375 'i': '%M',
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376 's': '%S',
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377 'e': '%Z',
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378 'O': '%z',
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379 'c': '%Y-%m-%dT%H:%M:%SZ'}
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380 return multi_replace(fmt, replacements)
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diff changeset
381