Mercurial > piecrust2

annotate piecrust/rendering.py @ 180:ede1a59f481d

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Added tag 2.0.0a5 for changeset acc718ab56da
author Ludovic Chabant <ludovic@chabant.com>
date Sat, 03 Jan 2015 23:14:01 -0800
parents e9a3d405e18f
children fff195335d0a
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rev   line source
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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.sources.base import PageSource
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7 from piecrust.templating.base import TemplateNotFoundError, TemplatingError
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8 from piecrust.uriutil import get_slug
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11 logger = logging.getLogger(__name__)
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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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36 PASS_NONE = 0
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37 PASS_FORMATTING = 1
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38 PASS_RENDERING = 2
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40
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41 class PageRenderingContext(object):
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42 def __init__(self, page, uri, page_num=1, force_render=False):
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43 self.page = page
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44 self.uri = uri
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45 self.page_num = page_num
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46 self.force_render = force_render
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47 self.pagination_source = None
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48 self.pagination_filter = None
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49 self.custom_data = None
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50 self.use_cache = False
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51 self.used_assets = None
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52 self.used_pagination = None
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53 self.used_source_names = set()
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54 self.used_taxonomy_terms = set()
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55 self.current_pass = PASS_NONE
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56
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57 @property
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58 def app(self):
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59 return self.page.app
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60
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61 @property
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62 def slug(self):
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63 return get_slug(self.page.app, self.uri)
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64
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65 @property
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66 def source_metadata(self):
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67 return self.page.source_metadata
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68
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69 def reset(self):
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70 self.used_pagination = None
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71
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72 def setPagination(self, paginator):
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73 if self.used_pagination is not None:
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74 raise Exception("Pagination has already been used.")
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75 self.used_pagination = paginator
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76 self.addUsedSource(paginator._source)
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78 def addUsedSource(self, source):
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79 if isinstance(source, PageSource):
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80 self.used_source_names.add((source.name, self.current_pass))
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81
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82
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83 def render_page(ctx):
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84 eis = ctx.app.env.exec_info_stack
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85 eis.pushPage(ctx.page, ctx)
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86 try:
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87 page = ctx.page
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88
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89 # Build the data for both segment and layout rendering.
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90 data_ctx = DataBuildingContext(page, ctx.uri, ctx.page_num)
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91 data_ctx.pagination_source = ctx.pagination_source
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92 data_ctx.pagination_filter = ctx.pagination_filter
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93 page_data = build_page_data(data_ctx)
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94 if ctx.custom_data:
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95 page_data.update(ctx.custom_data)
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96
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97 # Render content segments.
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98 ctx.current_pass = PASS_FORMATTING
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99 repo = ctx.app.env.rendered_segments_repository
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100 if repo and not ctx.force_render:
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101 cache_key = '%s:%s' % (ctx.uri, ctx.page_num)
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102 page_time = page.path_mtime
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103 contents = repo.get(
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104 cache_key,
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105 lambda: _do_render_page_segments(page, page_data),
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106 fs_cache_time=page_time)
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107 else:
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108 contents = _do_render_page_segments(page, page_data)
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109
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110 # Render layout.
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111 ctx.current_pass = PASS_RENDERING
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112 layout_name = page.config.get('layout')
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113 if layout_name is None:
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114 layout_name = page.source.config.get('default_layout', 'default')
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115 null_names = ['', 'none', 'nil']
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116 if layout_name not in null_names:
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117 layout_data = build_layout_data(page, page_data, contents)
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118 output = render_layout(layout_name, page, layout_data)
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119 else:
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120 output = contents['content']
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121
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122 rp = RenderedPage(page, ctx.uri, ctx.page_num)
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123 rp.data = page_data
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124 rp.content = output
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125 rp.execution_info = eis.current_page_info
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126 return rp
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127 finally:
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128 ctx.current_pass = PASS_NONE
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129 eis.popPage()
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130
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131
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132 def render_page_segments(ctx):
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133 repo = ctx.app.env.rendered_segments_repository
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134 if repo:
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135 cache_key = '%s:%s' % (ctx.uri, ctx.page_num)
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136 return repo.get(cache_key,
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137 lambda: _do_render_page_segments_from_ctx(ctx),
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138 fs_cache_time=ctx.page.path_mtime)
3
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139
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140 return _do_render_page_segments_from_ctx(ctx)
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141
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142
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143 def _do_render_page_segments_from_ctx(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 ctx.current_pass = PASS_FORMATTING
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147 try:
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148 data_ctx = DataBuildingContext(ctx.page, ctx.uri, ctx.page_num)
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149 page_data = build_page_data(data_ctx)
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150 return _do_render_page_segments(ctx.page, page_data)
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151 finally:
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152 ctx.current_pass = PASS_NONE
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153 eis.popPage()
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154
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155
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156 def _do_render_page_segments(page, page_data):
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157 app = page.app
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158 engine_name = page.config.get('template_engine')
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159 format_name = page.config.get('format')
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160
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161 engine = get_template_engine(app, engine_name)
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162 if engine is None:
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163 raise PageRenderingError("Can't find template engine '%s'." % engine_name)
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164
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165 formatted_content = {}
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166 for seg_name, seg in page.raw_content.items():
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167 seg_text = ''
3
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168 for seg_part in seg.parts:
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169 part_format = seg_part.fmt or format_name
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170 try:
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171 part_text = engine.renderString(
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172 seg_part.content, page_data,
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173 filename=page.path)
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174 except TemplatingError as err:
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175 err.lineno += seg_part.line
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176 raise err
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177
3
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178 part_text = format_text(app, part_format, part_text)
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179 seg_text += part_text
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180 formatted_content[seg_name] = seg_text
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181
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182 if seg_name == 'content':
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183 m = content_abstract_re.search(seg_text)
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184 if m:
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185 offset = m.start()
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186 content_abstract = seg_text[:offset]
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187 formatted_content['content.abstract'] = content_abstract
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188
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189 return formatted_content
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190
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191
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192 def render_layout(layout_name, page, layout_data):
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193 names = layout_name.split(',')
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194 default_template_engine = get_template_engine(page.app, None)
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195 default_exts = ['.' + e.lstrip('.') for e in default_template_engine.EXTENSIONS]
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196 full_names = []
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197 for name in names:
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198 if '.' not in name:
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199 full_names.append(name + '.html')
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200 for ext in default_exts:
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201 full_names.append(name + ext)
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202 else:
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203 full_names.append(name)
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204
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205 _, engine_name = os.path.splitext(full_names[0])
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206 engine_name = engine_name.lstrip('.')
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207 engine = get_template_engine(page.app, engine_name)
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208 if engine is None:
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209 raise PageRenderingError("No such template engine: %s" % engine_name)
153
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diff changeset
210 try:
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diff changeset
211 output = engine.renderFile(full_names, layout_data)
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diff changeset
212 except TemplateNotFoundError as ex:
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diff changeset
213 msg = "Can't find template for page: %s\n" % page.path
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214 msg += "Looked for: %s" % ', '.join(full_names)
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diff changeset
215 raise Exception(msg) from ex
3
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216 return output
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217
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218
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219 def get_template_engine(app, engine_name):
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220 if engine_name == 'html':
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221 engine_name = None
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222 engine_name = engine_name or app.config.get('site/default_template_engine')
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223 for engine in app.plugin_loader.getTemplateEngines():
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224 if engine_name in engine.ENGINE_NAMES:
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225 return engine
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226 return None
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227
128
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228 def format_text(app, format_name, txt, exact_format=False):
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diff changeset
229 if exact_format and not format_name:
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230 raise Exception("You need to specify a format name.")
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diff changeset
231
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diff changeset
232 format_count = 0
3
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233 format_name = format_name or app.config.get('site/default_format')
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234 for fmt in app.plugin_loader.getFormatters():
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235 if fmt.FORMAT_NAMES is None or format_name in fmt.FORMAT_NAMES:
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236 txt = fmt.render(format_name, txt)
128
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diff changeset
237 format_count += 1
3
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238 if fmt.OUTPUT_FORMAT is not None:
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239 format_name = fmt.OUTPUT_FORMAT
128
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diff changeset
240 if exact_format and format_count == 0:
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diff changeset
241 raise Exception("No such format: %s" % format_name)
3
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242 return txt
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243