Mercurial > piecrust2

annotate piecrust/templating/jinjaengine.py @ 1188:a7c43131d871

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bake: Fix file write flushing problem with Python 3.8+ Writing the cache files fails in Python 3.8 because it looks like flushing behaviour has changed. We need to explicitly flush. And even then, in very rare occurrences, it looks like it can still run into racing conditions, so we do a very hacky and ugly "retry" loop when fetching cached data :(
author Ludovic Chabant <ludovic@chabant.com>
date Tue, 15 Jun 2021 22:36:23 -0700
parents 8adc27285d93
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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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8 logger = logging.getLogger(__name__)
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11 class JinjaTemplateEngine(TemplateEngine):
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12 ENGINE_NAMES = ['jinja', 'jinja2', 'j2']
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13 EXTENSIONS = ['html', 'jinja', 'jinja2', 'j2']
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14
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15 def __init__(self):
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16 self.env = None
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17 self._jinja_syntax_error = None
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18 self._jinja_not_found = None
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19
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20 def renderSegment(self, path, segment, data):
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21 if not _string_needs_render(segment.content):
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22 return segment.content, False
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23
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24 self._ensureLoaded()
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25
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26 seg_path = _make_segment_path(path, segment.offset)
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27 self.env.loader.segments_cache[seg_path] = (
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28 path, segment.content)
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29 try:
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30 tpl = self.env.get_template(seg_path)
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31 except self._jinja_syntax_error as tse:
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32 raise self._getTemplatingError(tse, filename=path)
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33 except self._jinja_not_found:
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34 raise TemplateNotFoundError()
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35
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36 try:
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37 return tpl.render(data), True
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38 except self._jinja_syntax_error as tse:
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39 raise self._getTemplatingError(tse)
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40 except AbortedSourceUseError:
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41 raise
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42 except Exception as ex:
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43 if self.app.debug:
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44 raise
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45 msg = "Error rendering Jinja markup"
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46 rel_path = os.path.relpath(path, self.app.root_dir)
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47 raise TemplatingError(msg, rel_path) from ex
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48
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49 def renderFile(self, paths, data):
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50 self._ensureLoaded()
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51
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52 try:
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53 tpl = self.env.select_template(paths)
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54 except self._jinja_syntax_error as tse:
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55 raise self._getTemplatingError(tse)
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56 except self._jinja_not_found:
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57 raise TemplateNotFoundError()
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59 try:
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60 return tpl.render(data)
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61 except self._jinja_syntax_error as tse:
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62 raise self._getTemplatingError(tse)
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63 except AbortedSourceUseError:
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64 raise
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65 except Exception as ex:
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66 if self.app.debug:
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67 raise
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68 msg = "Error rendering Jinja markup"
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69 name = getattr(tpl, 'name', '<unknown template>')
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70 raise TemplatingError(msg, name) from ex
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71
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72 def _getTemplatingError(self, tse, filename=None):
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73 filename = tse.filename or filename
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74 if filename and os.path.isabs(filename):
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75 filename = os.path.relpath(filename, self.env.app.root_dir)
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76 err = TemplatingError(str(tse), filename, tse.lineno)
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77 raise err from tse
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79 def _ensureLoaded(self):
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80 if self.env is not None:
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81 return
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82
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83 stats = self.app.env.stats
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84 stats.registerTimer('JinjaTemplateEngine_setup',
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85 raise_if_registered=False)
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86 stats.registerTimer('JinjaTemplateEngine_extensions',
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87 raise_if_registered=False)
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88 with stats.timerScope('JinjaTemplateEngine_setup'):
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89 self._load()
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90
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91 def _load(self):
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92 get_config = self.app.config.get
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93
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94 # Get the list of extensions to load.
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95 ext_names = get_config('jinja/extensions', [])
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96 if not isinstance(ext_names, list):
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97 ext_names = [ext_names]
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98
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99 # Turn on autoescape by default.
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100 autoescape = get_config('jinja/auto_escape', True)
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101 if autoescape:
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102 ext_names.append('autoescape')
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103
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104 # Create the final list of extensions.
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105 from piecrust.templating.jinja.extensions import (
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106 PieCrustHighlightExtension, PieCrustCacheExtension,
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107 PieCrustSpacelessExtension, PieCrustFormatExtension)
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108 extensions = [
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109 PieCrustHighlightExtension,
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110 PieCrustCacheExtension,
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111 PieCrustSpacelessExtension,
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112 PieCrustFormatExtension]
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113 for n in ext_names:
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114 if '.' not in n:
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115 n = 'jinja2.ext.' + n
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116 extensions.append(n)
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117 for je in self.app.plugin_loader.getTemplateEngineExtensions('jinja'):
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118 extensions.append(je)
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119
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120 # Create the Jinja environment.
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121 logger.debug("Creating Jinja environment with folders: %s" %
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122 self.app.templates_dirs)
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123 from piecrust.templating.jinja.loader import PieCrustLoader
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124 loader = PieCrustLoader(self.app.templates_dirs)
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125 from piecrust.templating.jinja.environment import PieCrustEnvironment
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126 self.env = PieCrustEnvironment(
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127 self.app,
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128 loader=loader,
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129 extensions=extensions)
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130
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131 # Get types we need later.
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132 from jinja2 import TemplateNotFound
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133 from jinja2.exceptions import TemplateSyntaxError
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134 self._jinja_syntax_error = TemplateSyntaxError
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135 self._jinja_not_found = TemplateNotFound
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f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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parents:
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136
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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137
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138 def _string_needs_render(txt):
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139 index = txt.find('{')
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140 while index >= 0:
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141 ch = txt[index + 1]
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142 if ch == '{' or ch == '%':
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143 return True
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144 index = txt.find('{', index + 1)
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145 return False
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146
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147
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148 def _make_segment_path(path, start):
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149 return '$seg=%s:%d' % (path, start)
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150