Mercurial > piecrust2

annotate piecrust/rendering.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 2fec3ee1298f
children 0445a2232de7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 piecrust.data.builder import (DataBuildingContext, build_page_data,
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5 build_layout_data)
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6 from piecrust.environment import PHASE_PAGE_FORMATTING, PHASE_PAGE_RENDERING
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7 from piecrust.sources.base import PageSource
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8 from piecrust.uriutil import get_slug
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10
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11 logger = logging.getLogger(__name__)
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12
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14 content_abstract_re = re.compile(r'^<!--\s*(more|(page)?break)\s*-->\s*$',
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15 re.MULTILINE)
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17
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18 class PageRenderingError(Exception):
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19 pass
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21
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22 class RenderedPage(object):
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23 def __init__(self, page, uri, num=1):
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24 self.page = page
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25 self.uri = uri
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26 self.num = num
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27 self.data = None
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28 self.content = None
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29 self.execution_info = None
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31 @property
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32 def app(self):
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33 return self.page.app
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35
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36 class PageRenderingContext(object):
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37 def __init__(self, page, uri, page_num=1):
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38 self.page = page
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39 self.uri = uri
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40 self.page_num = page_num
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41 self.pagination_source = None
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42 self.pagination_filter = None
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43 self.custom_data = None
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44 self.use_cache = False
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45 self.used_assets = None
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46 self.used_pagination = None
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47 self.used_source_names = set()
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48 self.used_taxonomy_terms = set()
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49
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50 @property
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51 def app(self):
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52 return self.page.app
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53
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54 @property
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55 def slug(self):
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56 return get_slug(self.page.app, self.uri)
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57
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58 @property
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59 def source_metadata(self):
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60 return self.page.source_metadata
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61
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62 def reset(self):
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63 self.used_pagination = None
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64
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65 def setPagination(self, paginator):
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66 if self.used_pagination is not None:
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67 raise Exception("Pagination has already been used.")
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68 self.used_pagination = paginator
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69
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70 def addUsedSource(self, source):
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71 if isinstance(source, PageSource):
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72 self.used_source_names.add(source.name)
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73
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74
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75 def render_page(ctx):
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76 eis = ctx.app.env.exec_info_stack
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77 eis.pushPage(ctx.page, PHASE_PAGE_RENDERING, ctx)
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78 try:
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79 page = ctx.page
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80
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81 # Build the data for both segment and layout rendering.
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82 data_ctx = DataBuildingContext(page, ctx.uri, ctx.page_num)
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83 data_ctx.pagination_source = ctx.pagination_source
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84 data_ctx.pagination_filter = ctx.pagination_filter
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85 page_data = build_page_data(data_ctx)
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86 if ctx.custom_data:
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87 page_data.update(ctx.custom_data)
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88
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89 # Render content segments.
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90 repo = ctx.app.env.rendered_segments_repository
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91 if repo:
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92 cache_key = '%s:%s' % (ctx.uri, ctx.page_num)
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93 page_time = page.path_mtime
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94 contents = repo.get(cache_key,
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95 lambda: _do_render_page_segments(page, page_data),
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96 fs_cache_time=page_time)
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97 else:
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98 contents = _do_render_page_segments(page, page_data)
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99
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100 # Render layout.
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101 layout_name = page.config.get('layout')
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102 if layout_name is None:
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103 layout_name = page.source.config.get('default_layout', 'default')
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104 null_names = ['', 'none', 'nil']
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105 if layout_name not in null_names:
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106 layout_data = build_layout_data(page, page_data, contents)
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107 output = render_layout(layout_name, page, layout_data)
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108 else:
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109 output = contents['content']
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110
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111 rp = RenderedPage(page, ctx.uri, ctx.page_num)
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112 rp.data = page_data
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113 rp.content = output
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114 rp.execution_info = eis.current_page_info
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115 return rp
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116 finally:
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117 eis.popPage()
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118
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119
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120 def render_page_segments(ctx):
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121 repo = ctx.app.env.rendered_segments_repository
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122 if repo:
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123 cache_key = '%s:%s' % (ctx.uri, ctx.page_num)
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124 return repo.get(cache_key,
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125 lambda: _do_render_page_segments_from_ctx(ctx),
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126 fs_cache_time=ctx.page.path_mtime)
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127
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128 return _do_render_page_segments_from_ctx(ctx)
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129
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130
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131 def _do_render_page_segments_from_ctx(ctx):
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132 eis = ctx.app.env.exec_info_stack
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133 eis.pushPage(ctx.page, PHASE_PAGE_FORMATTING, ctx)
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134 try:
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135 data_ctx = DataBuildingContext(ctx.page, ctx.uri, ctx.page_num)
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136 page_data = build_page_data(data_ctx)
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137 return _do_render_page_segments(ctx.page, page_data)
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138 finally:
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139 eis.popPage()
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140
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141
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142 def _do_render_page_segments(page, page_data):
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143 app = page.app
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144 engine_name = page.config.get('template_engine')
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145 format_name = page.config.get('format')
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146
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147 engine = get_template_engine(app, engine_name)
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148 if engine is None:
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149 raise PageRenderingError("Can't find template engine '%s'." % engine_name)
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150
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151 formatted_content = {}
5
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152 for seg_name, seg in page.raw_content.items():
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153 seg_text = ''
3
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154 for seg_part in seg.parts:
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155 part_format = seg_part.fmt or format_name
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156 part_text = engine.renderString(seg_part.content, page_data,
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157 filename=page.path, line_offset=seg_part.line)
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158 part_text = format_text(app, part_format, part_text)
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159 seg_text += part_text
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160 formatted_content[seg_name] = seg_text
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161
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162 if seg_name == 'content':
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163 m = content_abstract_re.search(seg_text)
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164 if m:
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165 offset = m.start()
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166 content_abstract = seg_text[:offset]
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167 formatted_content['content.abstract'] = content_abstract
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168
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169 return formatted_content
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170
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171
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172 def render_layout(layout_name, page, layout_data):
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173 names = layout_name.split(',')
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174 default_template_engine = get_template_engine(page.app, None)
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175 default_exts = ['.' + e.lstrip('.') for e in default_template_engine.EXTENSIONS]
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176 full_names = []
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177 for name in names:
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178 if '.' not in name:
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179 full_names.append(name + '.html')
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180 for ext in default_exts:
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181 full_names.append(name + ext)
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182 else:
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183 full_names.append(name)
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184
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185 _, engine_name = os.path.splitext(full_names[0])
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186 engine_name = engine_name.lstrip('.')
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187 engine = get_template_engine(page.app, engine_name)
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188 if engine is None:
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189 raise PageRenderingError("No such template engine: %s" % engine_name)
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190 output = engine.renderFile(full_names, layout_data)
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191 return output
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192
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193
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194 def get_template_engine(app, engine_name):
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195 if engine_name == 'html':
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196 engine_name = None
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197 engine_name = engine_name or app.config.get('site/default_template_engine')
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198 for engine in app.plugin_loader.getTemplateEngines():
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199 if engine_name in engine.ENGINE_NAMES:
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200 return engine
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201 return None
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202
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203 def format_text(app, format_name, txt):
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204 format_name = format_name or app.config.get('site/default_format')
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205 for fmt in app.plugin_loader.getFormatters():
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206 if fmt.FORMAT_NAMES is None or format_name in fmt.FORMAT_NAMES:
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207 txt = fmt.render(format_name, txt)
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208 if fmt.OUTPUT_FORMAT is not None:
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209 format_name = fmt.OUTPUT_FORMAT
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210 return txt
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211