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annotate piecrust/rendering.py @ 383:44cf6ce62467

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docs: Add lame bit of documentation on publishing your website.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 10 May 2015 23:34:50 -0700
parents 4b1019bb2533
children e7b865f8f335
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1 import re
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2 import os.path
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3 import logging
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4 from werkzeug.utils import cached_property
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5 from piecrust.data.builder import (DataBuildingContext, build_page_data,
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6 build_layout_data)
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7 from piecrust.data.filters import (
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8 PaginationFilter, HasFilterClause, IsFilterClause, AndBooleanClause,
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9 page_value_accessor)
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10 from piecrust.sources.base import PageSource
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11 from piecrust.templating.base import TemplateNotFoundError, TemplatingError
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14 logger = logging.getLogger(__name__)
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15
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16
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17 content_abstract_re = re.compile(r'^<!--\s*(more|(page)?break)\s*-->\s*$',
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18 re.MULTILINE)
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20
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21 class PageRenderingError(Exception):
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22 pass
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24
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25 class TemplateEngineNotFound(Exception):
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26 pass
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28
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29 class QualifiedPage(object):
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30 def __init__(self, page, route, route_metadata):
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31 self.page = page
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32 self.route = route
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33 self.route_metadata = route_metadata
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34
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35 def getUri(self, sub_num=1):
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36 return self.route.getUri(self.route_metadata, provider=self.page,
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37 sub_num=sub_num)
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38
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39 def __getattr__(self, name):
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40 return getattr(self.page, name)
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42
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43 class RenderedPage(object):
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44 def __init__(self, page, uri, num=1):
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45 self.page = page
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46 self.uri = uri
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47 self.num = num
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48 self.data = None
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49 self.content = None
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50
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51 @property
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52 def app(self):
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53 return self.page.app
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55
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56 PASS_NONE = 0
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57 PASS_FORMATTING = 1
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58 PASS_RENDERING = 2
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61 RENDER_PASSES = [PASS_FORMATTING, PASS_RENDERING]
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62
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63
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64 class RenderPassInfo(object):
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65 def __init__(self):
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66 self.used_source_names = set()
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67 self.used_taxonomy_terms = set()
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69
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70 class PageRenderingContext(object):
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71 def __init__(self, qualified_page, page_num=1, force_render=False):
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72 self.page = qualified_page
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73 self.page_num = page_num
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74 self.force_render = force_render
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75 self.pagination_source = None
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76 self.pagination_filter = None
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77 self.custom_data = None
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78 self._current_pass = PASS_NONE
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79
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80 self.render_passes = {}
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81 self.used_pagination = None
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82 self.used_assets = None
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83
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84 @property
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85 def app(self):
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86 return self.page.app
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87
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88 @property
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89 def source_metadata(self):
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90 return self.page.source_metadata
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91
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92 @cached_property
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93 def uri(self):
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94 return self.page.getUri(self.page_num)
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95
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96 @property
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97 def current_pass_info(self):
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98 return self.render_passes.get(self._current_pass)
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99
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100 def setCurrentPass(self, rdr_pass):
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101 if rdr_pass != PASS_NONE:
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102 self.render_passes.setdefault(rdr_pass, RenderPassInfo())
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103 self._current_pass = rdr_pass
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104
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105 def setPagination(self, paginator):
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106 self._raiseIfNoCurrentPass()
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107 if self.used_pagination is not None:
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108 raise Exception("Pagination has already been used.")
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109 self.used_pagination = paginator
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110 self.addUsedSource(paginator._source)
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111
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112 def addUsedSource(self, source):
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113 self._raiseIfNoCurrentPass()
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114 if isinstance(source, PageSource):
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115 pass_info = self.render_passes[self._current_pass]
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116 pass_info.used_source_names.add(source.name)
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117
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118 def setTaxonomyFilter(self, taxonomy, term_value):
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119 is_combination = isinstance(term_value, tuple)
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120 flt = PaginationFilter(value_accessor=page_value_accessor)
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121 if taxonomy.is_multiple:
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122 if is_combination:
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123 abc = AndBooleanClause()
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124 for t in term_value:
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125 abc.addClause(HasFilterClause(taxonomy.setting_name, t))
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126 flt.addClause(abc)
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127 else:
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128 flt.addClause(
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129 HasFilterClause(taxonomy.setting_name, term_value))
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130 else:
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131 flt.addClause(IsFilterClause(taxonomy.setting_name, term_value))
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132 self.pagination_filter = flt
334
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diff changeset
133
324
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diff changeset
134 self.custom_data = {
334
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135 taxonomy.term_name: term_value,
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136 'is_multiple_%s' % taxonomy.term_name: is_combination}
324
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diff changeset
137
338
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diff changeset
138 def _raiseIfNoCurrentPass(self):
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139 if self._current_pass == PASS_NONE:
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140 raise Exception("No rendering pass is currently active.")
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141
3
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142
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143 def render_page(ctx):
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144 eis = ctx.app.env.exec_info_stack
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145 eis.pushPage(ctx.page, ctx)
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146 try:
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147 page = ctx.page
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148
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149 # Build the data for both segment and layout rendering.
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150 data_ctx = DataBuildingContext(page, page_num=ctx.page_num)
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151 data_ctx.pagination_source = ctx.pagination_source
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152 data_ctx.pagination_filter = ctx.pagination_filter
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153 page_data = build_page_data(data_ctx)
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154 if ctx.custom_data:
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155 page_data.update(ctx.custom_data)
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156
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157 # Render content segments.
338
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158 ctx.setCurrentPass(PASS_FORMATTING)
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159 repo = ctx.app.env.rendered_segments_repository
174
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160 if repo and not ctx.force_render:
334
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161 cache_key = ctx.uri
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162 page_time = page.path_mtime
158
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163 contents = repo.get(
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164 cache_key,
49
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165 lambda: _do_render_page_segments(page, page_data),
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166 fs_cache_time=page_time)
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167 else:
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168 contents = _do_render_page_segments(page, page_data)
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169
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170 # Render layout.
338
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171 ctx.setCurrentPass(PASS_RENDERING)
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172 layout_name = page.config.get('layout')
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173 if layout_name is None:
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174 layout_name = page.source.config.get('default_layout', 'default')
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175 null_names = ['', 'none', 'nil']
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176 if layout_name not in null_names:
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177 build_layout_data(page, page_data, contents)
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178 output = render_layout(layout_name, page, page_data)
3
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179 else:
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180 output = contents['content']
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181
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182 rp = RenderedPage(page, ctx.uri, ctx.page_num)
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183 rp.data = page_data
7
343d08ef5668 More PieCrust 3 fixes, and a couple of miscellaneous bug fixes.
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184 rp.content = output
3
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185 return rp
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186 finally:
338
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187 ctx.setCurrentPass(PASS_NONE)
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188 eis.popPage()
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189
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190
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191 def render_page_segments(ctx):
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192 repo = ctx.app.env.rendered_segments_repository
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193 if repo:
369
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194 cache_key = ctx.uri
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195 return repo.get(
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196 cache_key,
50
2fec3ee1298f Properly override pages between realms.
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diff changeset
197 lambda: _do_render_page_segments_from_ctx(ctx),
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198 fs_cache_time=ctx.page.path_mtime)
3
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199
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200 return _do_render_page_segments_from_ctx(ctx)
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201
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202
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203 def _do_render_page_segments_from_ctx(ctx):
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204 eis = ctx.app.env.exec_info_stack
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0445a2232de7 Improvements and fixes to incremental baking.
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diff changeset
205 eis.pushPage(ctx.page, ctx)
338
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diff changeset
206 ctx.setCurrentPass(PASS_FORMATTING)
3
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diff changeset
207 try:
369
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diff changeset
208 data_ctx = DataBuildingContext(ctx.page, page_num=ctx.page_num)
3
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209 page_data = build_page_data(data_ctx)
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210 return _do_render_page_segments(ctx.page, page_data)
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211 finally:
338
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diff changeset
212 ctx.setCurrentPass(PASS_NONE)
3
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213 eis.popPage()
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214
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215
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216 def _do_render_page_segments(page, page_data):
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217 app = page.app
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218 engine_name = page.config.get('template_engine')
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219 format_name = page.config.get('format')
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220
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221 engine = get_template_engine(app, engine_name)
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222
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223 formatted_content = {}
5
474c9882decf Upgrade to Python 3.
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diff changeset
224 for seg_name, seg in page.raw_content.items():
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diff changeset
225 seg_text = ''
3
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226 for seg_part in seg.parts:
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227 part_format = seg_part.fmt or format_name
128
28444014ce7d Fix error reporting and counting of lines.
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diff changeset
228 try:
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diff changeset
229 part_text = engine.renderString(
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diff changeset
230 seg_part.content, page_data,
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diff changeset
231 filename=page.path)
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diff changeset
232 except TemplatingError as err:
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diff changeset
233 err.lineno += seg_part.line
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diff changeset
234 raise err
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diff changeset
235
3
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236 part_text = format_text(app, part_format, part_text)
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237 seg_text += part_text
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238 formatted_content[seg_name] = seg_text
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239
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240 if seg_name == 'content':
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241 m = content_abstract_re.search(seg_text)
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242 if m:
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243 offset = m.start()
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244 content_abstract = seg_text[:offset]
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245 formatted_content['content.abstract'] = content_abstract
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246
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247 return formatted_content
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248
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249
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250 def render_layout(layout_name, page, layout_data):
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251 names = layout_name.split(',')
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252 default_template_engine = get_template_engine(page.app, None)
183
fff195335d0a render: When a template engine can't be found, show the correct name in the error.
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diff changeset
253 default_exts = ['.' + e.lstrip('.')
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diff changeset
254 for e in default_template_engine.EXTENSIONS]
3
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255 full_names = []
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256 for name in names:
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257 if '.' not in name:
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258 for ext in default_exts:
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259 full_names.append(name + ext)
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260 else:
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261 full_names.append(name)
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262
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263 _, engine_name = os.path.splitext(full_names[0])
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264 engine_name = engine_name.lstrip('.')
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265 engine = get_template_engine(page.app, engine_name)
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266
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267 try:
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268 output = engine.renderFile(full_names, layout_data)
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269 except TemplateNotFoundError as ex:
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270 msg = "Can't find template for page: %s\n" % page.path
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271 msg += "Looked for: %s" % ', '.join(full_names)
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272 raise Exception(msg) from ex
3
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273 return output
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274
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275
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276 def get_template_engine(app, engine_name):
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277 if engine_name == 'html':
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278 engine_name = None
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279 engine_name = engine_name or app.config.get('site/default_template_engine')
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280 for engine in app.plugin_loader.getTemplateEngines():
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281 if engine_name in engine.ENGINE_NAMES:
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282 return engine
183
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283 raise TemplateEngineNotFound("No such template engine: %s" % engine_name)
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284
3
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285
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286 def format_text(app, format_name, txt, exact_format=False):
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287 if exact_format and not format_name:
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288 raise Exception("You need to specify a format name.")
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289
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290 format_count = 0
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291 format_name = format_name or app.config.get('site/default_format')
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292 for fmt in app.plugin_loader.getFormatters():
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293 if fmt.FORMAT_NAMES is None or format_name in fmt.FORMAT_NAMES:
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294 txt = fmt.render(format_name, txt)
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295 format_count += 1
3
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296 if fmt.OUTPUT_FORMAT is not None:
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297 format_name = fmt.OUTPUT_FORMAT
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298 if exact_format and format_count == 0:
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299 raise Exception("No such format: %s" % format_name)
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300 return txt
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301