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annotate piecrust/templating/jinjaengine.py @ 3:f485ba500df3

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Gigantic change to basically make PieCrust 2 vaguely functional. - Serving works, with debug window. - Baking works, multi-threading, with dependency handling. - Various things not implemented yet.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 10 Aug 2014 23:43:16 -0700
parents
children 474c9882decf
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rev   line source
3
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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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.rendering import format_text
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13 from piecrust.routing import CompositeRouteFunction
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14 from piecrust.templating.base import TemplateEngine, TemplateNotFoundError
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15
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16
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17 logger = logging.getLogger(__name__)
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18
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19
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20 class JinjaTemplateEngine(TemplateEngine):
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21 # Name `twig` is for backwards compatibility with PieCrust 1.x.
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22 ENGINE_NAMES = ['jinja', 'jinja2', 'twig']
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23 EXTENSIONS = ['jinja', 'jinja2', 'twig']
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24
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25 def __init__(self):
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26 self.env = None
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27
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28 def renderString(self, txt, data, filename=None, line_offset=0):
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29 self._ensureLoaded()
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30 tpl = self.env.from_string(txt)
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31 try:
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32 return tpl.render(data)
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33 except TemplateSyntaxError as tse:
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34 tse.lineno += line_offset
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35 if filename:
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36 tse.filename = filename
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37 import sys
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38 _, __, traceback = sys.exc_info()
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39 raise tse, None, traceback
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40
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41 def renderFile(self, paths, data):
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42 self._ensureLoaded()
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43 tpl = None
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44 logger.debug("Looking for template: %s" % paths)
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45 for p in paths:
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46 try:
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47 tpl = self.env.get_template(p)
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48 break
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49 except TemplateNotFound:
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50 pass
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51 if tpl is None:
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52 raise TemplateNotFoundError()
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53 return tpl.render(data)
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54
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55
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56 def _ensureLoaded(self):
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57 if self.env:
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58 return
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59 loader = FileSystemLoader(self.app.templates_dirs)
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60 self.env = PieCrustEnvironment(
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61 self.app,
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62 loader=loader,
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63 extensions=['jinja2.ext.autoescape',
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64 PieCrustHighlightExtension,
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65 PieCrustCacheExtension])
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66
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67
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68 class PieCrustEnvironment(Environment):
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69 def __init__(self, app, *args, **kwargs):
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70 super(PieCrustEnvironment, self).__init__(*args, **kwargs)
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71 self.app = app
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72 self.globals.update({
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73 'fail': raise_exception})
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74 self.filters.update({
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75 'formatwith': self._formatWith,
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76 'markdown': lambda v: self._formatWith(v, 'markdown'),
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77 'textile': lambda v: self._formatWith(v, 'textile'),
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78 'nocache': add_no_cache_parameter,
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79 'wordcount': get_word_count,
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80 'stripoutertag': strip_outer_tag,
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81 'stripslash': strip_slash,
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82 'titlecase': title_case,
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83 'atomdate': get_atom_date,
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84 'date': get_date})
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85 # Backwards compatibility with PieCrust 1.x.
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86 self.globals.update({
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87 'pcfail': raise_exception})
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88
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89 # Backwards compatibility with Twig.
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90 twig_compatibility_mode = app.config.get('jinja/twig_compatibility')
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91 if twig_compatibility_mode is None or twig_compatibility_mode is True:
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92 self.trim_blocks = True
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93 self.filters['raw'] = self.filters['safe']
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94
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95 # Add route functions.
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96 for route in app.routes:
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97 name = route.template_func_name
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98 func = self.globals.get(name)
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99 if func is None:
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100 func = CompositeRouteFunction()
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101 func.addFunc(route)
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102 self.globals[name] = func
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103 elif isinstance(func, CompositeRouteFunction):
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104 self.globals[name].addFunc(route)
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105 else:
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106 raise Exception("Route function '%s' collides with an "
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107 "existing function or template data." %
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108 name)
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109
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110 def _formatWith(self, value, format_name):
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111 return format_text(self.app, format_name, value)
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112
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113
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114 def raise_exception(msg):
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115 raise Exception(msg)
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116
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117
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118 def add_no_cache_parameter(value, param_name='t', param_value=None):
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119 if not param_value:
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120 param_value = time.time()
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121 if '?' in value:
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122 value += '&'
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123 else:
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124 value += '?'
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125 value += '%s=%s' % (param_name, param_value)
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126 return value
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127
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128
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129 def get_word_count(value):
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130 return len(value.split())
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131
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132
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133 def strip_outer_tag(value, tag=None):
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134 tag_pattern = '[a-z]+[a-z0-9]*'
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135 if tag is not None:
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136 tag_pattern = re.escape(tag)
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137 pat = r'^\<' + tag_pattern + r'\>(.*)\</' + tag_pattern + '>$'
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138 m = re.match(pat, value)
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139 if m:
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140 return m.group(1)
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141 return value
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142
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143
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144 def strip_slash(value):
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145 return value.rstrip('/')
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146
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147
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148 def title_case(value):
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149 return value.title()
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150
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151
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152 def get_atom_date(value):
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153 return strict_rfc3339.timestamp_to_rfc3339_localoffset(int(value))
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154
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155
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156 def get_date(value, fmt):
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157 return time.strftime(fmt, time.localtime(value))
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158
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159
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160 class PieCrustHighlightExtension(Extension):
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161 tags = set(['highlight', 'geshi'])
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162
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163 def __init__(self, environment):
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164 super(PieCrustHighlightExtension, self).__init__(environment)
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165
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166 def parse(self, parser):
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167 lineno = next(parser.stream).lineno
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168
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169 # Extract the language name.
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170 args = [parser.parse_expression()]
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171
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172 # Extract optional arguments.
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173 kwarg_names = {'line_numbers': 0, 'use_classes': 0, 'class': 1, 'id': 1}
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174 kwargs = {}
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175 while not parser.stream.current.test('block_end'):
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176 name = parser.stream.expect('name')
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177 if name.value not in kwarg_names:
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178 raise Exception("'%s' is not a valid argument for the code "
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179 "highlighting tag." % name.value)
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180 if kwarg_names[name.value] == 0:
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181 kwargs[name.value] = Const(True)
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182 elif parser.stream.skip_if('assign'):
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183 kwargs[name.value] = parser.parse_expression()
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184
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185 # body of the block
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186 body = parser.parse_statements(['name:endhighlight', 'name:endgeshi'],
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187 drop_needle=True)
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188
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189 return CallBlock(self.call_method('_highlight', args, kwargs),
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190 [], [], body).set_lineno(lineno)
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191
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192 def _highlight(self, lang, line_numbers=False, use_classes=False,
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193 css_class=None, css_id=None, caller=None):
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194 # Try to be mostly compatible with Jinja2-highlight's settings.
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195 body = caller()
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196
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197 if lang is None:
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198 lexer = guess_lexer(body)
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199 else:
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200 lexer = get_lexer_by_name(lang, stripall=False)
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201
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202 if css_class is None:
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203 try:
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204 css_class = self.environment.jinja2_highlight_cssclass
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205 except AttributeError:
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206 pass
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207
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208 if css_class is not None:
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209 formatter = HtmlFormatter(cssclass=css_class,
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210 linenos=line_numbers)
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211 else:
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212 formatter = HtmlFormatter(linenos=line_numbers)
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213
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214 code = highlight(Markup(body.rstrip()).unescape(), lexer, formatter)
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215 return code
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216
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217
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218 class PieCrustCacheExtension(Extension):
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219 tags = set(['pccache'])
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220
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221 def __init__(self, environment):
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222 super(PieCrustCacheExtension, self).__init__(environment)
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223
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224 environment.extend(
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225 piecrust_cache_prefix='',
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226 piecrust_cache={}
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227 )
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228
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229 def parse(self, parser):
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230 # the first token is the token that started the tag. In our case
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231 # we only listen to ``'pccache'`` so this will be a name token with
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232 # `pccache` as value. We get the line number so that we can give
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233 # that line number to the nodes we create by hand.
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234 lineno = parser.stream.next().lineno
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235
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236 # now we parse a single expression that is used as cache key.
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237 args = [parser.parse_expression()]
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238
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239 # now we parse the body of the cache block up to `endpccache` and
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240 # drop the needle (which would always be `endpccache` in that case)
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241 body = parser.parse_statements(['name:endpccache'], drop_needle=True)
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242
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243 # now return a `CallBlock` node that calls our _cache_support
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244 # helper method on this extension.
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245 return CallBlock(self.call_method('_cache_support', args),
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246 [], [], body).set_lineno(lineno)
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247
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248 def _cache_support(self, name, caller):
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249 key = self.environment.piecrust_cache_prefix + name
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250
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251 # try to load the block from the cache
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252 # if there is no fragment in the cache, render it and store
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253 # it in the cache.
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254 rv = self.environment.piecrust_cache.get(key)
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255 if rv is not None:
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256 return rv
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257 rv = caller()
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258 self.environment.piecrust_cache[key] = rv
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259 return rv
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260