Mercurial > piecrust2
annotate piecrust/templating/jinjaengine.py @ 293:d013cc191922
jinja: Add a global function to render Pygments' CSS styles.
author | Ludovic Chabant <ludovic@chabant.com> |
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date | Sun, 08 Mar 2015 22:58:28 -0700 |
parents | 078e64dba77d |
children | b7ab1b503510 |
rev | line source |
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3
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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 strict_rfc3339 |
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7 from jinja2 import Environment, FileSystemLoader, TemplateNotFound |
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8 from jinja2.exceptions import TemplateSyntaxError |
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9 from jinja2.ext import Extension, Markup |
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10 from jinja2.lexer import Token, describe_token |
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11 from jinja2.nodes import CallBlock, Const |
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12 from compressinja.html import HtmlCompressor, StreamProcessContext |
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13 from pygments import highlight |
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14 from pygments.formatters import HtmlFormatter |
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15 from pygments.lexers import get_lexer_by_name, guess_lexer |
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Add the `paginate` filter to Jinja, activate `auto_reload`.
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16 from piecrust.data.paginator import Paginator |
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17 from piecrust.rendering import format_text |
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18 from piecrust.routing import CompositeRouteFunction |
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19 from piecrust.templating.base import (TemplateEngine, TemplateNotFoundError, |
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20 TemplatingError) |
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21 from piecrust.uriutil import multi_replace, get_first_sub_uri |
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22 |
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23 |
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24 logger = logging.getLogger(__name__) |
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25 |
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26 |
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27 class JinjaTemplateEngine(TemplateEngine): |
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28 # Name `twig` is for backwards compatibility with PieCrust 1.x. |
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29 ENGINE_NAMES = ['jinja', 'jinja2', 'twig'] |
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30 EXTENSIONS = ['jinja', 'jinja2', 'twig', 'html'] |
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31 |
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32 def __init__(self): |
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33 self.env = None |
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34 |
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35 def renderString(self, txt, data, filename=None): |
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36 self._ensureLoaded() |
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37 |
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38 try: |
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39 tpl = self.env.from_string(txt) |
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40 except TemplateSyntaxError as tse: |
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41 raise self._getTemplatingError(tse, filename=filename) |
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42 except TemplateNotFound: |
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43 raise TemplateNotFoundError() |
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44 |
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45 try: |
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46 return tpl.render(data) |
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47 except TemplateSyntaxError as tse: |
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48 raise self._getTemplatingError(tse) |
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49 |
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50 def renderFile(self, paths, data): |
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51 self._ensureLoaded() |
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52 tpl = None |
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53 logger.debug("Looking for template: %s" % paths) |
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54 for p in paths: |
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55 try: |
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56 tpl = self.env.get_template(p) |
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57 break |
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58 except TemplateSyntaxError as tse: |
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59 raise self._getTemplatingError(tse) |
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60 except TemplateNotFound: |
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61 pass |
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62 |
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63 if tpl is None: |
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64 raise TemplateNotFoundError() |
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65 |
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66 try: |
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67 return tpl.render(data) |
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68 except TemplateSyntaxError as tse: |
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69 raise self._getTemplatingError(tse) |
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70 |
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71 def _getTemplatingError(self, tse, filename=None): |
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72 filename = tse.filename or filename |
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73 if filename and os.path.isabs(filename): |
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74 filename = os.path.relpath(filename, self.env.app.root_dir) |
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75 err = TemplatingError(str(tse), filename, tse.lineno) |
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76 raise err from tse |
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77 |
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78 def _ensureLoaded(self): |
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79 if self.env: |
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80 return |
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81 |
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82 autoescape = self.app.config.get('jinja/auto_escape') |
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83 if autoescape is None: |
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84 autoescape = self.app.config.get('twig/auto_escape') |
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85 if autoescape is None: |
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86 autoescape = True |
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87 |
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88 logger.debug("Creating Jinja environment with folders: %s" % |
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89 self.app.templates_dirs) |
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90 loader = FileSystemLoader(self.app.templates_dirs) |
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91 extensions = [ |
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92 PieCrustHighlightExtension, |
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93 PieCrustCacheExtension, |
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94 PieCrustSpacelessExtension, |
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95 PieCrustFormatExtension] |
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96 if autoescape: |
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97 extensions.append('jinja2.ext.autoescape') |
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98 self.env = PieCrustEnvironment( |
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99 self.app, |
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100 loader=loader, |
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101 extensions=extensions) |
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102 |
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103 |
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104 class PieCrustEnvironment(Environment): |
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105 def __init__(self, app, *args, **kwargs): |
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106 self.app = app |
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107 |
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108 # Before we create the base Environement, let's figure out the options |
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109 # we want to pass to it. |
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110 twig_compatibility_mode = app.config.get('jinja/twig_compatibility') |
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111 |
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112 # Disable auto-reload when we're baking. |
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113 if app.config.get('baker/is_baking'): |
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114 kwargs.setdefault('auto_reload', False) |
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115 |
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116 # Let the user override most Jinja options via the site config. |
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117 for name in ['block_start_string', 'block_end_string', |
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118 'variable_start_string', 'variable_end_string', |
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119 'comment_start_string', 'comment_end_string', |
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120 'line_statement_prefix', 'line_comment_prefix', |
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121 'trim_blocks', 'lstrip_blocks', |
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122 'newline_sequence', 'keep_trailing_newline']: |
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123 val = app.config.get('jinja/' + name) |
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124 if val is not None: |
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125 kwargs.setdefault(name, val) |
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126 |
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127 # Twig trims blocks. |
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128 if twig_compatibility_mode is True: |
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129 kwargs['trim_blocks'] = True |
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130 |
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131 # All good! Create the Environment. |
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132 super(PieCrustEnvironment, self).__init__(*args, **kwargs) |
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133 |
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134 # Now add globals and filters. |
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135 self.globals.update({ |
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136 'fail': raise_exception, |
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137 'highlight_css': get_highlight_css}) |
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138 |
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139 self.filters.update({ |
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140 'keys': get_dict_keys, |
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141 'values': get_dict_values, |
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142 'paginate': self._paginate, |
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143 'formatwith': self._formatWith, |
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144 'markdown': lambda v: self._formatWith(v, 'markdown'), |
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145 'textile': lambda v: self._formatWith(v, 'textile'), |
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146 'nocache': add_no_cache_parameter, |
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147 'wordcount': get_word_count, |
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148 'stripoutertag': strip_outer_tag, |
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149 'stripslash': strip_slash, |
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150 'titlecase': title_case, |
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151 'atomdate': get_atom_date, |
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152 'date': get_date}) |
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153 |
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154 # Backwards compatibility with Twig. |
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155 if twig_compatibility_mode is True: |
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156 self.filters['raw'] = self.filters['safe'] |
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157 self.globals['pcfail'] = raise_exception |
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158 |
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159 # Add route functions. |
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160 for route in app.routes: |
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161 name = route.template_func_name |
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162 func = self.globals.get(name) |
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163 if func is None: |
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164 func = CompositeRouteFunction() |
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165 func.addFunc(route) |
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166 self.globals[name] = func |
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167 elif isinstance(func, CompositeRouteFunction): |
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168 self.globals[name].addFunc(route) |
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169 else: |
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170 raise Exception("Route function '%s' collides with an " |
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171 "existing function or template data." % |
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172 name) |
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173 |
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174 def _paginate(self, value, items_per_page=5): |
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175 cpi = self.app.env.exec_info_stack.current_page_info |
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176 if cpi is None or cpi.page is None or cpi.render_ctx is None: |
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177 raise Exception("Can't paginate when no page has been pushed " |
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178 "on the execution stack.") |
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179 first_uri = get_first_sub_uri(self.app, cpi.render_ctx.uri) |
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180 return Paginator(cpi.page, value, first_uri, |
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181 page_num=cpi.render_ctx.page_num, |
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182 items_per_page=items_per_page) |
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183 |
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184 def _formatWith(self, value, format_name): |
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185 return format_text(self.app, format_name, value) |
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186 |
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187 |
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188 def raise_exception(msg): |
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189 raise Exception(msg) |
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190 |
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191 |
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192 def get_dict_keys(value): |
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193 if isinstance(value, list): |
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194 return [i[0] for i in value] |
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195 return value.keys() |
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196 |
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197 |
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198 def get_dict_values(value): |
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199 if isinstance(value, list): |
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200 return [i[1] for i in value] |
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201 return value.values() |
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202 |
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203 |
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204 def add_no_cache_parameter(value, param_name='t', param_value=None): |
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205 if not param_value: |
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206 param_value = time.time() |
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207 if '?' in value: |
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208 value += '&' |
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209 else: |
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210 value += '?' |
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211 value += '%s=%s' % (param_name, param_value) |
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212 return value |
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213 |
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214 |
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215 def get_word_count(value): |
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216 return len(value.split()) |
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217 |
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218 |
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219 def strip_outer_tag(value, tag=None): |
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220 tag_pattern = '[a-z]+[a-z0-9]*' |
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221 if tag is not None: |
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222 tag_pattern = re.escape(tag) |
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223 pat = r'^\<' + tag_pattern + r'\>(.*)\</' + tag_pattern + '>$' |
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224 m = re.match(pat, value) |
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225 if m: |
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226 return m.group(1) |
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227 return value |
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228 |
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229 |
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230 def strip_slash(value): |
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231 return value.rstrip('/') |
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232 |
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233 |
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234 def title_case(value): |
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235 return value.title() |
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236 |
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237 |
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238 def get_atom_date(value): |
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239 return strict_rfc3339.timestamp_to_rfc3339_localoffset(int(value)) |
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240 |
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241 |
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242 def get_date(value, fmt): |
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243 if value == 'now': |
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244 value = time.time() |
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245 if '%' not in fmt: |
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246 suggest = php_format_to_strftime_format(fmt) |
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247 raise Exception("PieCrust 1 date formats won't work in PieCrust 2. " |
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248 "You probably want a format that look like '%s'. " |
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249 "Please check the `strftime` formatting page here: " |
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250 "https://docs.python.org/3/library/datetime.html" |
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251 "#strftime-and-strptime-behavior" % |
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252 suggest) |
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253 return time.strftime(fmt, time.localtime(value)) |
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254 |
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255 |
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256 class PieCrustFormatExtension(Extension): |
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257 tags = set(['pcformat']) |
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258 |
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259 def __init__(self, environment): |
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260 super(PieCrustFormatExtension, self).__init__(environment) |
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261 |
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262 def parse(self, parser): |
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263 lineno = next(parser.stream).lineno |
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264 args = [parser.parse_expression()] |
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265 body = parser.parse_statements(['name:endpcformat'], drop_needle=True) |
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266 return CallBlock(self.call_method('_format', args), |
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267 [], [], body).set_lineno(lineno) |
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268 |
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269 def _format(self, format_name, caller=None): |
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270 body = caller() |
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271 text = format_text(self.environment.app, |
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272 format_name, |
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273 Markup(body.rstrip()).unescape(), |
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274 exact_format=True) |
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275 return text |
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276 |
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277 |
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278 class PieCrustHighlightExtension(Extension): |
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279 tags = set(['highlight', 'geshi']) |
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280 |
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281 def __init__(self, environment): |
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282 super(PieCrustHighlightExtension, self).__init__(environment) |
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283 |
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284 def parse(self, parser): |
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285 lineno = next(parser.stream).lineno |
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286 |
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287 # Extract the language name. |
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288 args = [parser.parse_expression()] |
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289 |
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290 # Extract optional arguments. |
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291 kwarg_names = {'line_numbers': 0, 'use_classes': 0, 'class': 1, 'id': 1} |
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292 kwargs = {} |
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293 while not parser.stream.current.test('block_end'): |
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294 name = parser.stream.expect('name') |
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295 if name.value not in kwarg_names: |
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296 raise Exception("'%s' is not a valid argument for the code " |
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297 "highlighting tag." % name.value) |
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298 if kwarg_names[name.value] == 0: |
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299 kwargs[name.value] = Const(True) |
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300 elif parser.stream.skip_if('assign'): |
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301 kwargs[name.value] = parser.parse_expression() |
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302 |
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303 # body of the block |
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304 body = parser.parse_statements(['name:endhighlight', 'name:endgeshi'], |
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305 drop_needle=True) |
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306 |
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307 return CallBlock(self.call_method('_highlight', args, kwargs), |
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308 [], [], body).set_lineno(lineno) |
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309 |
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310 def _highlight(self, lang, line_numbers=False, use_classes=False, |
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311 css_class=None, css_id=None, caller=None): |
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312 # Try to be mostly compatible with Jinja2-highlight's settings. |
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313 body = caller() |
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314 |
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315 if lang is None: |
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316 lexer = guess_lexer(body) |
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317 else: |
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318 lexer = get_lexer_by_name(lang, stripall=False) |
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319 |
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320 if css_class is None: |
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321 try: |
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322 css_class = self.environment.jinja2_highlight_cssclass |
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323 except AttributeError: |
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324 pass |
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325 |
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326 if css_class is not None: |
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327 formatter = HtmlFormatter(cssclass=css_class, |
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328 linenos=line_numbers) |
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329 else: |
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330 formatter = HtmlFormatter(linenos=line_numbers) |
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331 |
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332 code = highlight(Markup(body.rstrip()).unescape(), lexer, formatter) |
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333 return code |
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334 |
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335 |
293
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336 def get_highlight_css(class_name='.highlight'): |
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337 return HtmlFormatter().get_style_defs(class_name) |
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338 |
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339 |
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340 class PieCrustCacheExtension(Extension): |
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341 tags = set(['pccache', 'cache']) |
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342 |
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343 def __init__(self, environment): |
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344 super(PieCrustCacheExtension, self).__init__(environment) |
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345 self._lock = threading.RLock() |
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346 |
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347 environment.extend( |
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348 piecrust_cache_prefix='', |
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349 piecrust_cache={} |
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350 ) |
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351 |
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352 def parse(self, parser): |
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353 # the first token is the token that started the tag. In our case |
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354 # we only listen to ``'pccache'`` so this will be a name token with |
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355 # `pccache` as value. We get the line number so that we can give |
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356 # that line number to the nodes we create by hand. |
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357 lineno = next(parser.stream).lineno |
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358 |
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359 # now we parse a single expression that is used as cache key. |
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360 args = [parser.parse_expression()] |
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361 |
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362 # now we parse the body of the cache block up to `endpccache` and |
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363 # drop the needle (which would always be `endpccache` in that case) |
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364 body = parser.parse_statements(['name:endpccache', 'name:endcache'], |
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365 drop_needle=True) |
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366 |
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367 # now return a `CallBlock` node that calls our _cache_support |
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368 # helper method on this extension. |
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369 return CallBlock(self.call_method('_cache_support', args), |
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370 [], [], body).set_lineno(lineno) |
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371 |
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372 def _cache_support(self, name, caller): |
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373 key = self.environment.piecrust_cache_prefix + name |
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374 |
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375 exc_stack = self.environment.app.env.exec_info_stack |
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376 render_ctx = exc_stack.current_page_info.render_ctx |
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377 |
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378 # try to load the block from the cache |
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379 # if there is no fragment in the cache, render it and store |
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380 # it in the cache. |
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381 pair = self.environment.piecrust_cache.get(key) |
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382 if pair is not None: |
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383 render_ctx.used_source_names.update(pair[1]) |
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384 return pair[0] |
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385 |
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386 with self._lock: |
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387 pair = self.environment.piecrust_cache.get(key) |
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388 if pair is not None: |
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389 render_ctx.used_source_names.update(pair[1]) |
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390 return pair[0] |
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391 |
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392 prev_used = render_ctx.used_source_names.copy() |
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393 rv = caller() |
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394 after_used = render_ctx.used_source_names.copy() |
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395 used_delta = after_used.difference(prev_used) |
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396 self.environment.piecrust_cache[key] = (rv, used_delta) |
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397 return rv |
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398 |
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399 |
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400 class PieCrustSpacelessExtension(HtmlCompressor): |
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401 """ A re-implementation of `SelectiveHtmlCompressor` so that we can |
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402 both use `strip` or `spaceless` in templates. |
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403 """ |
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404 def filter_stream(self, stream): |
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405 ctx = StreamProcessContext(stream) |
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406 strip_depth = 0 |
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407 while 1: |
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408 if stream.current.type == 'block_begin': |
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409 for tk in ['strip', 'spaceless']: |
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410 change = self._processToken(ctx, stream, tk) |
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411 if change != 0: |
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412 strip_depth += change |
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413 if strip_depth < 0: |
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414 ctx.fail('Unexpected tag end%s' % tk) |
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415 break |
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416 if strip_depth > 0 and stream.current.type == 'data': |
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417 ctx.token = stream.current |
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418 value = self.normalize(ctx) |
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419 yield Token(stream.current.lineno, 'data', value) |
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420 else: |
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421 yield stream.current |
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422 next(stream) |
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423 |
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424 def _processToken(self, ctx, stream, test_token): |
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425 change = 0 |
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426 if (stream.look().test('name:%s' % test_token) or |
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427 stream.look().test('name:end%s' % test_token)): |
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428 stream.skip() |
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429 if stream.current.value == test_token: |
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430 change = 1 |
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431 else: |
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432 change = -1 |
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433 stream.skip() |
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434 if stream.current.type != 'block_end': |
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435 ctx.fail('expected end of block, got %s' % |
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436 describe_token(stream.current)) |
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437 stream.skip() |
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438 return change |
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439 |
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440 |
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441 def php_format_to_strftime_format(fmt): |
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442 replacements = { |
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443 'd': '%d', |
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444 'D': '%a', |
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445 'j': '%d', |
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446 'l': '%A', |
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447 'w': '%w', |
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448 'z': '%j', |
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449 'W': '%W', |
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450 'F': '%B', |
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451 'm': '%m', |
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452 'M': '%b', |
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453 'n': '%m', |
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454 'y': '%Y', |
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455 'Y': '%y', |
1a30e3d7ee47
Error out if `date` filter is used with PHP date formats.
Ludovic Chabant <ludovic@chabant.com>
parents:
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456 'g': '%I', |
1a30e3d7ee47
Error out if `date` filter is used with PHP date formats.
Ludovic Chabant <ludovic@chabant.com>
parents:
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457 'G': '%H', |
1a30e3d7ee47
Error out if `date` filter is used with PHP date formats.
Ludovic Chabant <ludovic@chabant.com>
parents:
28
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458 'h': '%I', |
1a30e3d7ee47
Error out if `date` filter is used with PHP date formats.
Ludovic Chabant <ludovic@chabant.com>
parents:
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459 'H': '%H', |
1a30e3d7ee47
Error out if `date` filter is used with PHP date formats.
Ludovic Chabant <ludovic@chabant.com>
parents:
28
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460 'i': '%M', |
1a30e3d7ee47
Error out if `date` filter is used with PHP date formats.
Ludovic Chabant <ludovic@chabant.com>
parents:
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461 's': '%S', |
1a30e3d7ee47
Error out if `date` filter is used with PHP date formats.
Ludovic Chabant <ludovic@chabant.com>
parents:
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462 'e': '%Z', |
1a30e3d7ee47
Error out if `date` filter is used with PHP date formats.
Ludovic Chabant <ludovic@chabant.com>
parents:
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463 'O': '%z', |
1a30e3d7ee47
Error out if `date` filter is used with PHP date formats.
Ludovic Chabant <ludovic@chabant.com>
parents:
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464 'c': '%Y-%m-%dT%H:%M:%SZ'} |
1a30e3d7ee47
Error out if `date` filter is used with PHP date formats.
Ludovic Chabant <ludovic@chabant.com>
parents:
28
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465 return multi_replace(fmt, replacements) |
1a30e3d7ee47
Error out if `date` filter is used with PHP date formats.
Ludovic Chabant <ludovic@chabant.com>
parents:
28
diff
changeset
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466 |