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annotate piecrust/templating/jinjaengine.py @ 856:9bb22bbe093c

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refactor: Make the blog archives functional again. The blog archives are using the same pattern as the taxonomy support.
author Ludovic Chabant <ludovic@chabant.com>
date Tue, 06 Jun 2017 01:23:25 -0700
parents 448710d84121
children 5c5b85d4f17d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 import os.path
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2 import logging
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3 from piecrust.sources.base import AbortedSourceUseError
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4 from piecrust.templating.base import (TemplateEngine, TemplateNotFoundError,
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5 TemplatingError)
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7
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8 logger = logging.getLogger(__name__)
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9
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10
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11 class JinjaTemplateEngine(TemplateEngine):
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12 # Name `twig` is for backwards compatibility with PieCrust 1.x.
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13 ENGINE_NAMES = ['jinja', 'jinja2', 'j2', 'twig']
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14 EXTENSIONS = ['html', 'jinja', 'jinja2', 'j2', 'twig']
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15
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16 def __init__(self):
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17 self.env = None
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18 self._jinja_syntax_error = None
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19 self._jinja_not_found = None
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20
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21 def renderSegmentPart(self, path, seg_part, data):
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22 self._ensureLoaded()
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23
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24 if not _string_needs_render(seg_part.content):
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25 return seg_part.content
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26
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27 part_path = _make_segment_part_path(path, seg_part.offset)
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28 self.env.loader.segment_parts_cache[part_path] = (
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29 path, seg_part.content)
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30 try:
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31 tpl = self.env.get_template(part_path)
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32 except self._jinja_syntax_error as tse:
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33 raise self._getTemplatingError(tse, filename=path)
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34 except self._jinja_not_found:
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35 raise TemplateNotFoundError()
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36
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37 try:
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38 return tpl.render(data)
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39 except self._jinja_syntax_error as tse:
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40 raise self._getTemplatingError(tse)
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41 except AbortedSourceUseError:
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42 raise
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43 except Exception as ex:
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44 if self.app.debug:
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45 raise
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46 msg = "Error rendering Jinja markup"
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47 rel_path = os.path.relpath(path, self.app.root_dir)
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48 raise TemplatingError(msg, rel_path) from ex
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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 rendered_path = None
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55 for p in paths:
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56 try:
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57 tpl = self.env.get_template(p)
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58 rendered_path = p
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59 break
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60 except self._jinja_syntax_error as tse:
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61 raise self._getTemplatingError(tse)
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62 except self._jinja_not_found:
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63 pass
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64
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65 if tpl is None:
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66 raise TemplateNotFoundError()
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68 try:
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69 return tpl.render(data)
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70 except self._jinja_syntax_error as tse:
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71 raise self._getTemplatingError(tse)
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72 except AbortedSourceUseError:
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73 raise
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74 except Exception as ex:
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75 msg = "Error rendering Jinja markup"
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76 rel_path = os.path.relpath(rendered_path, self.app.root_dir)
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77 raise TemplatingError(msg, rel_path) from ex
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78
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79 def _getTemplatingError(self, tse, filename=None):
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80 filename = tse.filename or filename
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81 if filename and os.path.isabs(filename):
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82 filename = os.path.relpath(filename, self.env.app.root_dir)
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83 err = TemplatingError(str(tse), filename, tse.lineno)
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84 raise err from tse
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85
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86 def _ensureLoaded(self):
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87 if self.env is not None:
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88 return
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89
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90 stats = self.app.env.stats
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91 stats.registerTimer('JinjaTemplateEngineEnvironmentSetup',
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92 raise_if_registered=False)
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93 with stats.timerScope('JinjaTemplateEngineEnvironmentSetup'):
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94 self._load()
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95
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96 def _load(self):
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97 get_config = self.app.config.get
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98
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99 # Get the list of extensions to load.
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100 ext_names = get_config('jinja/extensions', [])
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101 if not isinstance(ext_names, list):
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102 ext_names = [ext_names]
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103
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104 # Turn on autoescape by default.
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105 autoescape = get_config('twig/auto_escape')
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106 if autoescape is not None:
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107 logger.warning("The `twig/auto_escape` setting is now called "
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108 "`jinja/auto_escape`.")
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109 else:
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110 autoescape = get_config('jinja/auto_escape', True)
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111 if autoescape:
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112 ext_names.append('autoescape')
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113
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114 # Create the final list of extensions.
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115 from piecrust.templating.jinja.extensions import (
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116 PieCrustHighlightExtension, PieCrustCacheExtension,
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117 PieCrustSpacelessExtension, PieCrustFormatExtension)
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118 extensions = [
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119 PieCrustHighlightExtension,
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120 PieCrustCacheExtension,
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121 PieCrustSpacelessExtension,
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122 PieCrustFormatExtension]
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123 for n in ext_names:
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124 if '.' not in n:
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125 n = 'jinja2.ext.' + n
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126 extensions.append(n)
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127 for je in self.app.plugin_loader.getTemplateEngineExtensions('jinja'):
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128 extensions.append(je)
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129
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130 # Create the Jinja environment.
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131 logger.debug("Creating Jinja environment with folders: %s" %
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132 self.app.templates_dirs)
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133 from piecrust.templating.jinja.loader import PieCrustLoader
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134 loader = PieCrustLoader(self.app.templates_dirs)
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135 from piecrust.templating.jinja.environment import PieCrustEnvironment
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136 self.env = PieCrustEnvironment(
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137 self.app,
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138 loader=loader,
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139 extensions=extensions)
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140
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141 # Get types we need later.
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142 from jinja2 import TemplateNotFound
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143 from jinja2.exceptions import TemplateSyntaxError
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144 self._jinja_syntax_error = TemplateSyntaxError
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145 self._jinja_not_found = TemplateNotFound
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146
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147
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148 def _string_needs_render(txt):
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149 index = txt.find('{')
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150 while index >= 0:
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151 ch = txt[index + 1]
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152 if ch == '{' or ch == '%':
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153 return True
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154 index = txt.find('{', index + 1)
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155 return False
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156
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157
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158 def _make_segment_part_path(path, start):
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159 return '$part=%s:%d' % (path, start)
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160
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161