Mercurial > piecrust2

annotate piecrust/page.py @ 91:e88e330eb8dc

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Improvements to incremental baking and cache invalidating.
author Ludovic Chabant <ludovic@chabant.com>
date Fri, 05 Sep 2014 00:42:13 -0700
parents e293f08d954e
children 0445a2232de7
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1 import re
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2 import sys
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3 import json
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4 import codecs
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5 import os.path
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6 import hashlib
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7 import logging
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8 import datetime
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9 import dateutil.parser
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10 import collections
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11 from werkzeug.utils import cached_property
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12 from piecrust.configuration import (Configuration, ConfigurationError,
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13 parse_config_header)
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14 from piecrust.environment import PHASE_PAGE_PARSING
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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 PageConfiguration(Configuration):
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21 def __init__(self, values=None, validate=True):
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22 super(PageConfiguration, self).__init__(values, validate)
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23
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24 def _validateAll(self, values):
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25 values.setdefault('title', 'Untitled Page')
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26 values.setdefault('content_type', 'html')
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27 ppp = values.get('posts_per_page')
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28 if ppp is not None:
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29 values.setdefault('items_per_page', ppp)
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30 pf = values.get('posts_filters')
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31 if pf is not None:
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32 values.setdefault('items_filters', pf)
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33 return values
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34
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35
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36 class Page(object):
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37 def __init__(self, source, source_metadata, rel_path):
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38 self.source = source
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39 self.source_metadata = source_metadata
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40 self.rel_path = rel_path
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41 self._config = None
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42 self._raw_content = None
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43 self._datetime = None
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44
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45 @property
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46 def app(self):
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47 return self.source.app
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48
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49 @property
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50 def ref_spec(self):
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51 return '%s:%s' % (self.source.name, self.rel_path)
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52
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53 @cached_property
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54 def path(self):
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55 return self.source.resolveRef(self.rel_path)
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56
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57 @cached_property
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58 def path_mtime(self):
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59 return os.path.getmtime(self.path)
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60
3
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61 @property
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62 def config(self):
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63 self._load()
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64 return self._config
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65
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66 @property
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67 def raw_content(self):
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68 self._load()
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69 return self._raw_content
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70
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71 @property
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72 def datetime(self):
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73 if self._datetime is None:
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74 if 'datetime' in self.source_metadata:
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75 self._datetime = self.source_metadata['datetime']
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76 elif 'date' in self.source_metadata:
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77 page_date = self.source_metadata['date']
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78 page_time = self.config.get('time')
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79 if page_time is not None:
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80 if isinstance(page_time, str):
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81 # Need to parse it...
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82 try:
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83 parsed_t = dateutil.parser.parse(page_time)
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84 except Exception as ex:
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85 raise ConfigurationError(
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86 "Invalid time '%s' in page: %s" %
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87 (page_time, self.path)) from ex
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88 page_time = datetime.time(parsed_t.hour,
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89 parsed_t.minute, parsed_t.second)
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90
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91 elif isinstance(page_time, int):
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92 # Total seconds... convert to a time struct.
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93 delta = datetime.timedelta(seconds=page_time)
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94 dummy = datetime.datetime(1970, 1, 1)
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95 dummy += delta
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96 page_time = dummy.time()
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97
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98 try:
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99 self._datetime = datetime.datetime.combine(
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100 page_date, page_time)
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101 except Exception as ex:
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102 raise ConfigurationError(
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103 "Invalid page time '%s' for: %s" % (
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104 page_time, self.path)) from ex
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105 else:
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106 self._datetime = datetime.datetime(
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107 page_date.year, page_date.month, page_date.day)
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108 else:
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109 self._datetime = datetime.datetime.fromtimestamp(
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110 self.path_mtime)
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111 if self._datetime is None:
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112 raise Exception("Got null datetime from path! %s" % self.path)
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113 return self._datetime
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114
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115 @datetime.setter
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116 def datetime(self, value):
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117 self._datetime = value
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118
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119 def getSegment(self, name='content'):
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120 return self.raw_content[name]
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121
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122 def _load(self):
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123 if self._config is not None:
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124 return
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125
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126 eis = self.app.env.exec_info_stack
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127 eis.pushPage(self, PHASE_PAGE_PARSING, None)
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128 try:
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129 config, content = load_page(self.app, self.path, self.path_mtime)
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130 self._config = config
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131 self._raw_content = content
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132 finally:
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133 eis.popPage()
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134
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135
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136 class PageLoadingError(Exception):
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137 def __init__(self, path, inner=None):
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138 super(PageLoadingError, self).__init__(
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139 "Error loading page: %s" % path,
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140 inner)
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141
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142
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143 class ContentSegment(object):
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144 debug_render_func = 'debug_render'
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145
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146 def __init__(self, content=None, fmt=None):
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147 self.parts = []
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148 if content is not None:
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149 self.parts.append(ContentSegmentPart(content, fmt))
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150
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151 def debug_render(self):
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152 return '\n'.join([p.content for p in self.parts])
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153
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154
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155 class ContentSegmentPart(object):
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156 def __init__(self, content, fmt=None, line=-1):
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157 self.content = content
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158 self.fmt = fmt
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159 self.line = line
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160
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161 def __str__(self):
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162 return '%s [%s]' % (self.content, self.fmt or '<default>')
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163
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164
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165 def json_load_segments(data):
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166 segments = {}
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167 for key, seg_data in data.items():
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168 seg = ContentSegment()
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169 for p_data in seg_data:
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170 part = ContentSegmentPart(p_data['c'], p_data['f'], p_data['l'])
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171 seg.parts.append(part)
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172 segments[key] = seg
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173 return segments
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174
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175
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176 def json_save_segments(segments):
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177 data = {}
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178 for key, seg in segments.items():
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179 seg_data = []
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180 for part in seg.parts:
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181 p_data = {'c': part.content, 'f': part.fmt, 'l': part.line}
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182 seg_data.append(p_data)
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183 data[key] = seg_data
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184 return data
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185
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186
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187 def load_page(app, path, path_mtime=None):
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188 try:
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189 return _do_load_page(app, path, path_mtime)
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190 except Exception as e:
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191 logger.exception("Error loading page: %s" %
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192 os.path.relpath(path, app.root_dir))
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193 _, __, traceback = sys.exc_info()
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194 raise PageLoadingError(path, e).with_traceback(traceback)
3
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195
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196
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197 def _do_load_page(app, path, path_mtime):
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198 exec_info = app.env.exec_info_stack.current_page_info
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199 if exec_info is None:
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200 raise Exception("Loading page '%s' but not execution context has "
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201 "been created for it." % path)
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202
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203 # Check the cache first.
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204 cache = app.cache.getCache('pages')
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205 cache_path = "%s.json" % hashlib.md5(path.encode('utf8')).hexdigest()
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206 page_time = path_mtime or os.path.getmtime(path)
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207 if cache.isValid(cache_path, page_time):
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208 exec_info.was_cache_valid = True
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563ce5dd02af I don't care what the YAML spec says, ordered maps are the only sane way.
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209 cache_data = json.loads(cache.read(cache_path),
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210 object_pairs_hook=collections.OrderedDict)
3
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211 config = PageConfiguration(values=cache_data['config'],
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212 validate=False)
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213 content = json_load_segments(cache_data['content'])
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214 return config, content
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215
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216 # Nope, load the page from the source file.
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217 exec_info.was_cache_valid = False
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218 logger.debug("Loading page configuration from: %s" % path)
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219 with codecs.open(path, 'r', 'utf-8') as fp:
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220 raw = fp.read()
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221 header, offset = parse_config_header(raw)
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222
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223 if not 'format' in header:
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224 auto_formats = app.config.get('site/auto_formats')
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225 name, ext = os.path.splitext(path)
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226 header['format'] = auto_formats.get(ext, None)
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227
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228 config = PageConfiguration(header)
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229 content = parse_segments(raw, offset)
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230 config.set('segments', list(content.keys()))
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231
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232 # Save to the cache.
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233 cache_data = {
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234 'config': config.get(),
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235 'content': json_save_segments(content)}
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236 cache.write(cache_path, json.dumps(cache_data))
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237
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238 return config, content
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239
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240
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241 segment_pattern = re.compile(
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242 r"""^\-\-\-\s*(?P<name>\w+)(\:(?P<fmt>\w+))?\s*\-\-\-\s*$""",
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243 re.M)
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244 part_pattern = re.compile(
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245 r"""^<\-\-\s*(?P<fmt>\w+)\s*\-\->\s*$""",
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246 re.M)
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247
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248
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249 def parse_segments(raw, offset=0):
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250 matches = list(segment_pattern.finditer(raw, offset))
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251 num_matches = len(matches)
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252 if num_matches > 0:
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253 contents = {}
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254
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255 first_offset = matches[0].start()
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256 if first_offset > 0:
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257 # There's some default content segment at the beginning.
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258 seg = ContentSegment()
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259 seg.parts = parse_segment_parts(raw, offset, first_offset)
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260 contents['content'] = seg
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261
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262 for i in range(1, num_matches):
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263 m1 = matches[i - 1]
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264 m2 = matches[i]
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265 seg = ContentSegment()
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266 seg.parts = parse_segment_parts(raw, m1.end() + 1,
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267 m2.start(), m1.group('fmt'))
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268 contents[m1.group('name')] = seg
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269
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270 # Handle text past the last match.
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271 lastm = matches[-1]
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272 seg = ContentSegment()
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273 seg.parts = parse_segment_parts(raw, lastm.end() + 1,
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274 len(raw), lastm.group('fmt'))
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275 contents[lastm.group('name')] = seg
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276
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277 return contents
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278 else:
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279 # No segments, just content.
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280 seg = ContentSegment()
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281 seg.parts = parse_segment_parts(raw, offset, len(raw))
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282 return {'content': seg}
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283
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284
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285 def parse_segment_parts(raw, start, end, first_part_fmt=None):
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286 matches = list(part_pattern.finditer(raw, start, end))
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287 num_matches = len(matches)
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288 if num_matches > 0:
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289 parts = []
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290
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291 # First part, before the first format change.
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292 parts.append(
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293 ContentSegmentPart(raw[start:matches[0].start()],
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294 first_part_fmt,
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295 start))
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296
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297 for i in range(1, num_matches):
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298 m1 = matches[i - 1]
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299 m2 = matches[i]
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300 parts.append(
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301 ContentSegmentPart(
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302 raw[m1.end() + 1:m2.start()],
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303 m1.group('fmt'),
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304 m1.end() + 1))
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305
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306 lastm = matches[-1]
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307 parts.append(ContentSegmentPart(raw[lastm.end() + 1:end],
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308 lastm.group('fmt'),
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309 lastm.end() + 1))
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310
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311 return parts
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312 else:
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313 return [ContentSegmentPart(raw[start:end], first_part_fmt)]
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314