annotate piecrust/templating/jinjaengine.py @ 445:d8d86debea81

performance: Only use Jinja2 for rendering text if necessary.
author Ludovic Chabant <ludovic@chabant.com>
date Tue, 30 Jun 2015 21:39:20 -0700
parents 9e25852f058b
children 4cdf6c2157a0
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1 import re
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2 import time
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3 import os.path
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4 import logging
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5 import threading
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6 import email.utils
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7 import strict_rfc3339
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8 from jinja2 import Environment, FileSystemLoader, TemplateNotFound
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9 from jinja2.exceptions import TemplateSyntaxError
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10 from jinja2.ext import Extension, Markup
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11 from jinja2.lexer import Token, describe_token
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12 from jinja2.nodes import CallBlock, Const
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13 from compressinja.html import HtmlCompressor, StreamProcessContext
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14 from pygments import highlight
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15 from pygments.formatters import HtmlFormatter
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16 from pygments.lexers import get_lexer_by_name, guess_lexer
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17 from piecrust.data.paginator import Paginator
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18 from piecrust.rendering import format_text
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19 from piecrust.routing import CompositeRouteFunction
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20 from piecrust.templating.base import (TemplateEngine, TemplateNotFoundError,
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21 TemplatingError)
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22 from piecrust.uriutil import multi_replace, split_sub_uri
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25 logger = logging.getLogger(__name__)
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28 class JinjaTemplateEngine(TemplateEngine):
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29 # Name `twig` is for backwards compatibility with PieCrust 1.x.
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30 ENGINE_NAMES = ['jinja', 'jinja2', 'twig']
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31 EXTENSIONS = ['html', 'jinja', 'jinja2', 'twig']
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33 def __init__(self):
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34 self.env = None
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35
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36 def renderString(self, txt, data, filename=None):
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37 self._ensureLoaded()
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38
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39 offset = 0
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40 do_render = False
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41 index = txt.find('{')
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42 while index >= 0:
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43 ch = txt[index + 1]
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44 if ch == '{' or ch == '%':
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45 do_render = True
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46 break
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47 index = txt.find('{', offset + 1)
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48
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49 if not do_render:
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50 return txt
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51
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52 try:
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53 tpl = self.env.from_string(txt)
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54 except TemplateSyntaxError as tse:
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55 raise self._getTemplatingError(tse, filename=filename)
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56 except TemplateNotFound:
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57 raise TemplateNotFoundError()
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58
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59 try:
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60 return tpl.render(data)
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61 except TemplateSyntaxError as tse:
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62 raise self._getTemplatingError(tse)
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64 def renderFile(self, paths, data):
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65 self._ensureLoaded()
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66 tpl = None
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67 logger.debug("Looking for template: %s" % paths)
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68 for p in paths:
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69 try:
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70 tpl = self.env.get_template(p)
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71 break
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72 except TemplateSyntaxError as tse:
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73 raise self._getTemplatingError(tse)
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74 except TemplateNotFound:
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75 pass
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77 if tpl is None:
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78 raise TemplateNotFoundError()
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80 try:
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81 return tpl.render(data)
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82 except TemplateSyntaxError as tse:
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83 raise self._getTemplatingError(tse)
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84
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85 def _getTemplatingError(self, tse, filename=None):
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86 filename = tse.filename or filename
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87 if filename and os.path.isabs(filename):
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88 filename = os.path.relpath(filename, self.env.app.root_dir)
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89 err = TemplatingError(str(tse), filename, tse.lineno)
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90 raise err from tse
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91
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92 def _ensureLoaded(self):
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93 if self.env:
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94 return
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96 autoescape = self.app.config.get('jinja/auto_escape')
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97 if autoescape is None:
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98 autoescape = self.app.config.get('twig/auto_escape')
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99 if autoescape is None:
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100 autoescape = True
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101
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102 logger.debug("Creating Jinja environment with folders: %s" %
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103 self.app.templates_dirs)
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104 loader = FileSystemLoader(self.app.templates_dirs)
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105 extensions = [
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106 PieCrustHighlightExtension,
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107 PieCrustCacheExtension,
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108 PieCrustSpacelessExtension,
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109 PieCrustFormatExtension]
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110 if autoescape:
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111 extensions.append('jinja2.ext.autoescape')
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112 self.env = PieCrustEnvironment(
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113 self.app,
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114 loader=loader,
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115 extensions=extensions)
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116
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117
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118 class PieCrustEnvironment(Environment):
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119 def __init__(self, app, *args, **kwargs):
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120 self.app = app
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121
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122 # Before we create the base Environement, let's figure out the options
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123 # we want to pass to it.
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124 twig_compatibility_mode = app.config.get('jinja/twig_compatibility')
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125
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126 # Disable auto-reload when we're baking.
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127 if app.config.get('baker/is_baking'):
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128 kwargs.setdefault('auto_reload', False)
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129
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130 # Let the user override most Jinja options via the site config.
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131 for name in ['block_start_string', 'block_end_string',
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132 'variable_start_string', 'variable_end_string',
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133 'comment_start_string', 'comment_end_string',
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134 'line_statement_prefix', 'line_comment_prefix',
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135 'trim_blocks', 'lstrip_blocks',
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136 'newline_sequence', 'keep_trailing_newline']:
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137 val = app.config.get('jinja/' + name)
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138 if val is not None:
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139 kwargs.setdefault(name, val)
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140
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141 # Twig trims blocks.
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142 if twig_compatibility_mode is True:
288
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143 kwargs['trim_blocks'] = True
274
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144
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145 # All good! Create the Environment.
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146 super(PieCrustEnvironment, self).__init__(*args, **kwargs)
274
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147
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148 # Now add globals and filters.
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149 self.globals.update({
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150 'fail': raise_exception,
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151 'highlight_css': get_highlight_css})
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152
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153 self.filters.update({
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154 'keys': get_dict_keys,
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155 'values': get_dict_values,
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156 'paginate': self._paginate,
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157 'formatwith': self._formatWith,
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158 'markdown': lambda v: self._formatWith(v, 'markdown'),
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159 'textile': lambda v: self._formatWith(v, 'textile'),
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160 'nocache': add_no_cache_parameter,
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161 'wordcount': get_word_count,
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162 'stripoutertag': strip_outer_tag,
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163 'stripslash': strip_slash,
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164 'titlecase': title_case,
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165 'atomdate': get_xml_date,
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166 'xmldate': get_xml_date,
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167 'emaildate': get_email_date,
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168 'date': get_date})
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169
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170 # Backwards compatibility with Twig.
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171 if twig_compatibility_mode is True:
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172 self.filters['raw'] = self.filters['safe']
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173 self.globals['pcfail'] = raise_exception
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174
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175 # Add route functions.
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176 for route in app.routes:
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177 name = route.template_func_name
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178 func = self.globals.get(name)
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179 if func is None:
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180 func = CompositeRouteFunction()
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181 func.addFunc(route)
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182 self.globals[name] = func
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183 elif isinstance(func, CompositeRouteFunction):
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184 self.globals[name].addFunc(route)
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185 else:
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186 raise Exception("Route function '%s' collides with an "
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187 "existing function or template data." %
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188 name)
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189
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190 def _paginate(self, value, items_per_page=5):
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191 cpi = self.app.env.exec_info_stack.current_page_info
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192 if cpi is None or cpi.page is None or cpi.render_ctx is None:
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193 raise Exception("Can't paginate when no page has been pushed "
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194 "on the execution stack.")
298
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195 first_uri, _ = split_sub_uri(self.app, cpi.render_ctx.uri)
352
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196 return Paginator(cpi.page, value,
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197 page_num=cpi.render_ctx.page_num,
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198 items_per_page=items_per_page)
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199
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200 def _formatWith(self, value, format_name):
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201 return format_text(self.app, format_name, value)
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202
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203
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204 def raise_exception(msg):
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205 raise Exception(msg)
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206
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207
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208 def get_dict_keys(value):
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209 if isinstance(value, list):
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210 return [i[0] for i in value]
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211 return value.keys()
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212
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213
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214 def get_dict_values(value):
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215 if isinstance(value, list):
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216 return [i[1] for i in value]
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217 return value.values()
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218
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219
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220 def add_no_cache_parameter(value, param_name='t', param_value=None):
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221 if not param_value:
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222 param_value = time.time()
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223 if '?' in value:
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224 value += '&'
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225 else:
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226 value += '?'
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227 value += '%s=%s' % (param_name, param_value)
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228 return value
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229
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230
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231 def get_word_count(value):
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232 return len(value.split())
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233
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234
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235 def strip_outer_tag(value, tag=None):
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236 tag_pattern = '[a-z]+[a-z0-9]*'
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237 if tag is not None:
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238 tag_pattern = re.escape(tag)
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239 pat = r'^\<' + tag_pattern + r'\>(.*)\</' + tag_pattern + '>$'
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240 m = re.match(pat, value)
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241 if m:
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242 return m.group(1)
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243 return value
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244
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245
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246 def strip_slash(value):
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247 return value.rstrip('/')
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248
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249
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250 def title_case(value):
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251 return value.title()
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252
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253
356
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254 def get_xml_date(value):
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255 return strict_rfc3339.timestamp_to_rfc3339_localoffset(int(value))
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256
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257
326
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258 def get_email_date(value, localtime=False):
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259 return email.utils.formatdate(value, localtime=localtime)
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260
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261
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262 def get_date(value, fmt):
28
19f3ac27c3d5 The `date` filter now supports passing `"now"` as in Twig.
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diff changeset
263 if value == 'now':
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264 value = time.time()
41
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265 if '%' not in fmt:
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266 suggest = php_format_to_strftime_format(fmt)
326
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267 if suggest != fmt:
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268 suggest_message = ("You probably want a format that looks "
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269 "like: '%s'." % suggest)
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270 else:
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271 suggest_message = ("We can't suggest a proper date format "
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272 "for you right now, though.")
41
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273 raise Exception("PieCrust 1 date formats won't work in PieCrust 2. "
326
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274 "%s\n"
41
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275 "Please check the `strftime` formatting page here: "
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276 "https://docs.python.org/3/library/datetime.html"
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277 "#strftime-and-strptime-behavior" %
326
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278 suggest_message)
3
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279 return time.strftime(fmt, time.localtime(value))
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280
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281
128
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282 class PieCrustFormatExtension(Extension):
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283 tags = set(['pcformat'])
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284
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285 def __init__(self, environment):
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286 super(PieCrustFormatExtension, self).__init__(environment)
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287
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288 def parse(self, parser):
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289 lineno = next(parser.stream).lineno
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290 args = [parser.parse_expression()]
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291 body = parser.parse_statements(['name:endpcformat'], drop_needle=True)
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292 return CallBlock(self.call_method('_format', args),
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293 [], [], body).set_lineno(lineno)
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294
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295 def _format(self, format_name, caller=None):
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296 body = caller()
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297 text = format_text(self.environment.app,
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298 format_name,
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299 Markup(body.rstrip()).unescape(),
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300 exact_format=True)
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301 return text
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302
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303
3
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304 class PieCrustHighlightExtension(Extension):
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305 tags = set(['highlight', 'geshi'])
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306
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307 def __init__(self, environment):
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308 super(PieCrustHighlightExtension, self).__init__(environment)
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309
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310 def parse(self, parser):
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311 lineno = next(parser.stream).lineno
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312
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313 # Extract the language name.
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314 args = [parser.parse_expression()]
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315
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316 # Extract optional arguments.
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317 kwarg_names = {'line_numbers': 0, 'use_classes': 0, 'class': 1, 'id': 1}
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318 kwargs = {}
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319 while not parser.stream.current.test('block_end'):
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320 name = parser.stream.expect('name')
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321 if name.value not in kwarg_names:
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322 raise Exception("'%s' is not a valid argument for the code "
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323 "highlighting tag." % name.value)
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324 if kwarg_names[name.value] == 0:
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325 kwargs[name.value] = Const(True)
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326 elif parser.stream.skip_if('assign'):
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327 kwargs[name.value] = parser.parse_expression()
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328
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329 # body of the block
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330 body = parser.parse_statements(['name:endhighlight', 'name:endgeshi'],
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331 drop_needle=True)
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332
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333 return CallBlock(self.call_method('_highlight', args, kwargs),
128
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334 [], [], body).set_lineno(lineno)
3
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335
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336 def _highlight(self, lang, line_numbers=False, use_classes=False,
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337 css_class=None, css_id=None, caller=None):
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338 # Try to be mostly compatible with Jinja2-highlight's settings.
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339 body = caller()
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340
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341 if lang is None:
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342 lexer = guess_lexer(body)
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343 else:
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344 lexer = get_lexer_by_name(lang, stripall=False)
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345
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346 if css_class is None:
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347 try:
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348 css_class = self.environment.jinja2_highlight_cssclass
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349 except AttributeError:
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350 pass
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351
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352 if css_class is not None:
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353 formatter = HtmlFormatter(cssclass=css_class,
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354 linenos=line_numbers)
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355 else:
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356 formatter = HtmlFormatter(linenos=line_numbers)
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357
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358 code = highlight(Markup(body.rstrip()).unescape(), lexer, formatter)
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359 return code
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360
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361
293
d013cc191922 jinja: Add a global function to render Pygments' CSS styles.
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diff changeset
362 def get_highlight_css(class_name='.highlight'):
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diff changeset
363 return HtmlFormatter().get_style_defs(class_name)
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diff changeset
364
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diff changeset
365
3
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366 class PieCrustCacheExtension(Extension):
65
071cc99b1779 Jinja templating now has `spaceless`, `|keys` and `|values`.
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diff changeset
367 tags = set(['pccache', 'cache'])
3
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368
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369 def __init__(self, environment):
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370 super(PieCrustCacheExtension, self).__init__(environment)
89
e771c202583a Fixes to the `cache` Jinja tag.
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diff changeset
371 self._lock = threading.RLock()
3
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372
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373 environment.extend(
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374 piecrust_cache_prefix='',
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375 piecrust_cache={}
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376 )
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377
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378 def parse(self, parser):
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379 # the first token is the token that started the tag. In our case
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380 # we only listen to ``'pccache'`` so this will be a name token with
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381 # `pccache` as value. We get the line number so that we can give
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382 # that line number to the nodes we create by hand.
7
343d08ef5668 More PieCrust 3 fixes, and a couple of miscellaneous bug fixes.
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diff changeset
383 lineno = next(parser.stream).lineno
3
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diff changeset
384
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385 # now we parse a single expression that is used as cache key.
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386 args = [parser.parse_expression()]
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387
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388 # now we parse the body of the cache block up to `endpccache` and
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389 # drop the needle (which would always be `endpccache` in that case)
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diff changeset
390 body = parser.parse_statements(['name:endpccache', 'name:endcache'],
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diff changeset
391 drop_needle=True)
3
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392
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393 # now return a `CallBlock` node that calls our _cache_support
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394 # helper method on this extension.
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395 return CallBlock(self.call_method('_cache_support', args),
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diff changeset
396 [], [], body).set_lineno(lineno)
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parents:
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397
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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398 def _cache_support(self, name, caller):
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399 key = self.environment.piecrust_cache_prefix + name
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400
89
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401 exc_stack = self.environment.app.env.exec_info_stack
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402 render_ctx = exc_stack.current_page_info.render_ctx
338
938be93215cb bake: Improve render context and bake record, fix incremental bake bugs.
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403 rdr_pass = render_ctx.current_pass_info
89
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404
3
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405 # try to load the block from the cache
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406 # if there is no fragment in the cache, render it and store
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407 # it in the cache.
89
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408 pair = self.environment.piecrust_cache.get(key)
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409 if pair is not None:
338
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410 rdr_pass.used_source_names.update(pair[1])
89
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411 return pair[0]
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412
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413 with self._lock:
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414 pair = self.environment.piecrust_cache.get(key)
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415 if pair is not None:
338
938be93215cb bake: Improve render context and bake record, fix incremental bake bugs.
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416 rdr_pass.used_source_names.update(pair[1])
89
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417 return pair[0]
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418
338
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419 prev_used = rdr_pass.used_source_names.copy()
89
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420 rv = caller()
338
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421 after_used = rdr_pass.used_source_names.copy()
89
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422 used_delta = after_used.difference(prev_used)
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423 self.environment.piecrust_cache[key] = (rv, used_delta)
3
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424 return rv
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425
41
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426
65
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427 class PieCrustSpacelessExtension(HtmlCompressor):
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428 """ A re-implementation of `SelectiveHtmlCompressor` so that we can
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429 both use `strip` or `spaceless` in templates.
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430 """
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431 def filter_stream(self, stream):
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432 ctx = StreamProcessContext(stream)
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433 strip_depth = 0
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434 while 1:
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435 if stream.current.type == 'block_begin':
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436 for tk in ['strip', 'spaceless']:
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437 change = self._processToken(ctx, stream, tk)
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diff changeset
438 if change != 0:
071cc99b1779 Jinja templating now has `spaceless`, `|keys` and `|values`.
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439 strip_depth += change
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440 if strip_depth < 0:
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441 ctx.fail('Unexpected tag end%s' % tk)
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diff changeset
442 break
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443 if strip_depth > 0 and stream.current.type == 'data':
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diff changeset
444 ctx.token = stream.current
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445 value = self.normalize(ctx)
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446 yield Token(stream.current.lineno, 'data', value)
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diff changeset
447 else:
071cc99b1779 Jinja templating now has `spaceless`, `|keys` and `|values`.
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diff changeset
448 yield stream.current
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diff changeset
449 next(stream)
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diff changeset
450
071cc99b1779 Jinja templating now has `spaceless`, `|keys` and `|values`.
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451 def _processToken(self, ctx, stream, test_token):
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452 change = 0
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453 if (stream.look().test('name:%s' % test_token) or
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diff changeset
454 stream.look().test('name:end%s' % test_token)):
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diff changeset
455 stream.skip()
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diff changeset
456 if stream.current.value == test_token:
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diff changeset
457 change = 1
071cc99b1779 Jinja templating now has `spaceless`, `|keys` and `|values`.
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diff changeset
458 else:
071cc99b1779 Jinja templating now has `spaceless`, `|keys` and `|values`.
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diff changeset
459 change = -1
071cc99b1779 Jinja templating now has `spaceless`, `|keys` and `|values`.
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diff changeset
460 stream.skip()
071cc99b1779 Jinja templating now has `spaceless`, `|keys` and `|values`.
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diff changeset
461 if stream.current.type != 'block_end':
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diff changeset
462 ctx.fail('expected end of block, got %s' %
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diff changeset
463 describe_token(stream.current))
071cc99b1779 Jinja templating now has `spaceless`, `|keys` and `|values`.
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diff changeset
464 stream.skip()
071cc99b1779 Jinja templating now has `spaceless`, `|keys` and `|values`.
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diff changeset
465 return change
071cc99b1779 Jinja templating now has `spaceless`, `|keys` and `|values`.
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diff changeset
466
071cc99b1779 Jinja templating now has `spaceless`, `|keys` and `|values`.
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diff changeset
467
41
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diff changeset
468 def php_format_to_strftime_format(fmt):
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diff changeset
469 replacements = {
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470 'd': '%d',
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diff changeset
471 'D': '%a',
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diff changeset
472 'j': '%d',
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diff changeset
473 'l': '%A',
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diff changeset
474 'w': '%w',
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diff changeset
475 'z': '%j',
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diff changeset
476 'W': '%W',
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diff changeset
477 'F': '%B',
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diff changeset
478 'm': '%m',
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diff changeset
479 'M': '%b',
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diff changeset
480 'n': '%m',
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diff changeset
481 'y': '%Y',
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diff changeset
482 'Y': '%y',
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diff changeset
483 'g': '%I',
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diff changeset
484 'G': '%H',
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parents: 28
diff changeset
485 'h': '%I',
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parents: 28
diff changeset
486 'H': '%H',
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diff changeset
487 'i': '%M',
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diff changeset
488 's': '%S',
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diff changeset
489 'e': '%Z',
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diff changeset
490 'O': '%z',
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diff changeset
491 'c': '%Y-%m-%dT%H:%M:%SZ'}
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diff changeset
492 return multi_replace(fmt, replacements)
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parents: 28
diff changeset
493