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annotate piecrust/templating/jinjaengine.py @ 59:e3e3de44377c

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Better handling of Jinja configuration.
author Ludovic Chabant <ludovic@chabant.com>
date Tue, 26 Aug 2014 23:20:19 -0700
parents 002fa58f54dc
children 071cc99b1779
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1 import re
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2 import time
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3 import logging
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4 import strict_rfc3339
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5 from jinja2 import Environment, FileSystemLoader, TemplateNotFound
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6 from jinja2.exceptions import TemplateSyntaxError
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7 from jinja2.ext import Extension, Markup
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8 from jinja2.nodes import CallBlock, Const
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9 from pygments import highlight
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10 from pygments.formatters import HtmlFormatter
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11 from pygments.lexers import get_lexer_by_name, guess_lexer
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12 from piecrust.data.paginator import Paginator
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13 from piecrust.rendering import format_text
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14 from piecrust.routing import CompositeRouteFunction
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15 from piecrust.templating.base import TemplateEngine, TemplateNotFoundError
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16 from piecrust.uriutil import multi_replace, get_first_sub_uri
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17
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18
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19 logger = logging.getLogger(__name__)
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21
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22 class JinjaTemplateEngine(TemplateEngine):
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23 # Name `twig` is for backwards compatibility with PieCrust 1.x.
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24 ENGINE_NAMES = ['jinja', 'jinja2', 'twig']
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25 EXTENSIONS = ['jinja', 'jinja2', 'twig']
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26
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27 def __init__(self):
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28 self.env = None
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29
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30 def renderString(self, txt, data, filename=None, line_offset=0):
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31 self._ensureLoaded()
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32 tpl = self.env.from_string(txt)
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33 try:
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34 return tpl.render(data)
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35 except TemplateSyntaxError as tse:
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36 tse.lineno += line_offset
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37 if filename:
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38 tse.filename = filename
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39 import sys
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40 _, __, traceback = sys.exc_info()
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41 raise tse.with_traceback(traceback)
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42
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43 def renderFile(self, paths, data):
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44 self._ensureLoaded()
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45 tpl = None
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46 logger.debug("Looking for template: %s" % paths)
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47 for p in paths:
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48 try:
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49 tpl = self.env.get_template(p)
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50 break
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51 except TemplateNotFound:
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52 pass
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53 if tpl is None:
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54 raise TemplateNotFoundError()
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55 return tpl.render(data)
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56
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57 def _ensureLoaded(self):
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58 if self.env:
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59 return
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60
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61 autoescape = self.app.config.get('jinja/auto_escape')
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62 if autoescape is None:
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63 autoescape = self.app.config.get('twig/auto_escape')
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64 if autoescape is None:
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65 autoescape = True
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66
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67 logger.debug("Creating Jinja environment with folders: %s" %
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68 self.app.templates_dirs)
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69 loader = FileSystemLoader(self.app.templates_dirs)
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70 extensions = [
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71 PieCrustHighlightExtension,
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72 PieCrustCacheExtension]
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73 if autoescape:
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74 extensions.append('jinja2.ext.autoescape')
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75 self.env = PieCrustEnvironment(
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76 self.app,
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77 loader=loader,
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78 extensions=extensions)
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79
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80
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81 class PieCrustEnvironment(Environment):
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82 def __init__(self, app, *args, **kwargs):
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83 super(PieCrustEnvironment, self).__init__(*args, **kwargs)
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84 self.app = app
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85 self.auto_reload = True
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86 self.globals.update({
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87 'fail': raise_exception})
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88 self.filters.update({
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89 'paginate': self._paginate,
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90 'formatwith': self._formatWith,
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91 'markdown': lambda v: self._formatWith(v, 'markdown'),
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92 'textile': lambda v: self._formatWith(v, 'textile'),
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93 'nocache': add_no_cache_parameter,
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94 'wordcount': get_word_count,
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95 'stripoutertag': strip_outer_tag,
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96 'stripslash': strip_slash,
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97 'titlecase': title_case,
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98 'atomdate': get_atom_date,
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99 'date': get_date})
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100 # Backwards compatibility with PieCrust 1.x.
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101 self.globals.update({
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102 'pcfail': raise_exception})
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103
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104 # Backwards compatibility with Twig.
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105 twig_compatibility_mode = app.config.get('jinja/twig_compatibility')
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106 if twig_compatibility_mode is None or twig_compatibility_mode is True:
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107 self.trim_blocks = True
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108 self.filters['raw'] = self.filters['safe']
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109
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110 # Add route functions.
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111 for route in app.routes:
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112 name = route.template_func_name
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113 func = self.globals.get(name)
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114 if func is None:
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115 func = CompositeRouteFunction()
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116 func.addFunc(route)
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117 self.globals[name] = func
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118 elif isinstance(func, CompositeRouteFunction):
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119 self.globals[name].addFunc(route)
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120 else:
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121 raise Exception("Route function '%s' collides with an "
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122 "existing function or template data." %
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123 name)
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124
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125 def _paginate(self, value, items_per_page=5):
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126 cpi = self.app.env.exec_info_stack.current_page_info
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127 if cpi is None or cpi.page is None or cpi.render_ctx is None:
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128 raise Exception("Can't paginate when no page has been pushed "
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129 "on the execution stack.")
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130 first_uri = get_first_sub_uri(self.app, cpi.render_ctx.uri)
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131 return Paginator(cpi.page, value, first_uri,
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132 page_num=cpi.render_ctx.page_num,
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133 items_per_page=items_per_page)
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134
3
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135 def _formatWith(self, value, format_name):
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136 return format_text(self.app, format_name, value)
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137
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138
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139 def raise_exception(msg):
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140 raise Exception(msg)
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141
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142
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143 def add_no_cache_parameter(value, param_name='t', param_value=None):
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144 if not param_value:
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145 param_value = time.time()
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146 if '?' in value:
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147 value += '&'
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148 else:
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149 value += '?'
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150 value += '%s=%s' % (param_name, param_value)
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151 return value
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152
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153
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154 def get_word_count(value):
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155 return len(value.split())
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156
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157
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158 def strip_outer_tag(value, tag=None):
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159 tag_pattern = '[a-z]+[a-z0-9]*'
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160 if tag is not None:
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161 tag_pattern = re.escape(tag)
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162 pat = r'^\<' + tag_pattern + r'\>(.*)\</' + tag_pattern + '>$'
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163 m = re.match(pat, value)
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164 if m:
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165 return m.group(1)
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166 return value
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167
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168
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169 def strip_slash(value):
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170 return value.rstrip('/')
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171
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172
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173 def title_case(value):
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174 return value.title()
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175
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176
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177 def get_atom_date(value):
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178 return strict_rfc3339.timestamp_to_rfc3339_localoffset(int(value))
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179
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180
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181 def get_date(value, fmt):
28
19f3ac27c3d5 The `date` filter now supports passing `"now"` as in Twig.
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182 if value == 'now':
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183 value = time.time()
41
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184 if '%' not in fmt:
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185 suggest = php_format_to_strftime_format(fmt)
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186 raise Exception("PieCrust 1 date formats won't work in PieCrust 2. "
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187 "You probably want a format that look like '%s'. "
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188 "Please check the `strftime` formatting page here: "
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189 "https://docs.python.org/3/library/datetime.html"
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190 "#strftime-and-strptime-behavior" %
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191 suggest)
3
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192 return time.strftime(fmt, time.localtime(value))
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193
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194
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195 class PieCrustHighlightExtension(Extension):
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196 tags = set(['highlight', 'geshi'])
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197
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198 def __init__(self, environment):
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199 super(PieCrustHighlightExtension, self).__init__(environment)
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200
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201 def parse(self, parser):
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202 lineno = next(parser.stream).lineno
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203
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204 # Extract the language name.
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205 args = [parser.parse_expression()]
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206
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207 # Extract optional arguments.
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208 kwarg_names = {'line_numbers': 0, 'use_classes': 0, 'class': 1, 'id': 1}
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209 kwargs = {}
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210 while not parser.stream.current.test('block_end'):
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211 name = parser.stream.expect('name')
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212 if name.value not in kwarg_names:
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213 raise Exception("'%s' is not a valid argument for the code "
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214 "highlighting tag." % name.value)
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215 if kwarg_names[name.value] == 0:
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216 kwargs[name.value] = Const(True)
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217 elif parser.stream.skip_if('assign'):
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218 kwargs[name.value] = parser.parse_expression()
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219
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220 # body of the block
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221 body = parser.parse_statements(['name:endhighlight', 'name:endgeshi'],
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222 drop_needle=True)
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223
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224 return CallBlock(self.call_method('_highlight', args, kwargs),
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225 [], [], body).set_lineno(lineno)
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226
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227 def _highlight(self, lang, line_numbers=False, use_classes=False,
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228 css_class=None, css_id=None, caller=None):
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229 # Try to be mostly compatible with Jinja2-highlight's settings.
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230 body = caller()
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231
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232 if lang is None:
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233 lexer = guess_lexer(body)
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234 else:
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235 lexer = get_lexer_by_name(lang, stripall=False)
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236
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237 if css_class is None:
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238 try:
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239 css_class = self.environment.jinja2_highlight_cssclass
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240 except AttributeError:
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241 pass
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242
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243 if css_class is not None:
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244 formatter = HtmlFormatter(cssclass=css_class,
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245 linenos=line_numbers)
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246 else:
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247 formatter = HtmlFormatter(linenos=line_numbers)
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248
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249 code = highlight(Markup(body.rstrip()).unescape(), lexer, formatter)
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250 return code
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251
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252
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253 class PieCrustCacheExtension(Extension):
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254 tags = set(['pccache'])
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255
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256 def __init__(self, environment):
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257 super(PieCrustCacheExtension, self).__init__(environment)
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258
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259 environment.extend(
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260 piecrust_cache_prefix='',
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261 piecrust_cache={}
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262 )
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263
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264 def parse(self, parser):
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265 # the first token is the token that started the tag. In our case
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266 # we only listen to ``'pccache'`` so this will be a name token with
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267 # `pccache` as value. We get the line number so that we can give
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268 # that line number to the nodes we create by hand.
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269 lineno = next(parser.stream).lineno
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270
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271 # now we parse a single expression that is used as cache key.
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272 args = [parser.parse_expression()]
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273
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274 # now we parse the body of the cache block up to `endpccache` and
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275 # drop the needle (which would always be `endpccache` in that case)
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276 body = parser.parse_statements(['name:endpccache'], drop_needle=True)
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277
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278 # now return a `CallBlock` node that calls our _cache_support
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279 # helper method on this extension.
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280 return CallBlock(self.call_method('_cache_support', args),
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281 [], [], body).set_lineno(lineno)
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282
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283 def _cache_support(self, name, caller):
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284 key = self.environment.piecrust_cache_prefix + name
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285
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286 # try to load the block from the cache
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287 # if there is no fragment in the cache, render it and store
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288 # it in the cache.
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289 rv = self.environment.piecrust_cache.get(key)
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290 if rv is not None:
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291 return rv
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292 rv = caller()
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293 self.environment.piecrust_cache[key] = rv
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294 return rv
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295
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296
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297 def php_format_to_strftime_format(fmt):
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298 replacements = {
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299 'd': '%d',
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300 'D': '%a',
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301 'j': '%d',
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302 'l': '%A',
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303 'w': '%w',
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304 'z': '%j',
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305 'W': '%W',
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306 'F': '%B',
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307 'm': '%m',
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308 'M': '%b',
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309 'n': '%m',
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310 'y': '%Y',
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311 'Y': '%y',
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312 'g': '%I',
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313 'G': '%H',
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314 'h': '%I',
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315 'H': '%H',
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316 'i': '%M',
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317 's': '%S',
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318 'e': '%Z',
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319 'O': '%z',
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320 'c': '%Y-%m-%dT%H:%M:%SZ'}
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321 return multi_replace(fmt, replacements)
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322