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annotate piecrust/rendering.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 os.path
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3 import codecs
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4 import logging
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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.environment import PHASE_PAGE_FORMATTING, PHASE_PAGE_RENDERING
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8
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9
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10 logger = logging.getLogger(__name__)
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11
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12
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13 content_abstract_re = re.compile(r'^<!--\s*(more|(page)?break)\s*-->\s*$',
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14 re.MULTILINE)
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15
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16
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17 class PageRenderingError(Exception):
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18 pass
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19
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20
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21 class RenderedPage(object):
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22 def __init__(self, page, uri, num=1):
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23 self.page = page
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24 self.uri = uri
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25 self.num = num
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26 self.data = None
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27 self.content = None
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28 self.execution_info = None
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29
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30 @property
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31 def app(self):
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32 return self.page.app
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33
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34
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35 class PageRenderingContext(object):
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36 def __init__(self, page, uri, page_num=1):
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37 self.page = page
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38 self.uri = uri
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39 self.page_num = page_num
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40 self.pagination_source = None
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41 self.pagination_filter = None
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42 self.custom_data = None
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43 self.use_cache = False
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44 self.used_pagination = None
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45 self.used_source_names = set()
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46 self.used_taxonomy_terms = set()
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47
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48 @property
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49 def app(self):
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50 return self.page.app
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51
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52 @property
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53 def source_metadata(self):
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54 return self.page.source_metadata
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55
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56 def reset(self):
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57 self.used_pagination = None
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58
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59 def setPagination(self, paginator):
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60 if self.used_pagination is not None:
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61 raise Exception("Pagination has already been used.")
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62 self.used_pagination = paginator
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63
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64
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65 def render_page(ctx):
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66 eis = ctx.app.env.exec_info_stack
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67 eis.pushPage(ctx.page, PHASE_PAGE_RENDERING, ctx)
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68 try:
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69 page = ctx.page
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70
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71 # Build the data for both segment and layout rendering.
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72 data_ctx = DataBuildingContext(page, ctx.uri, ctx.page_num)
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73 data_ctx.pagination_source = ctx.pagination_source
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74 data_ctx.pagination_filter = ctx.pagination_filter
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75 page_data = build_page_data(data_ctx)
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76 if ctx.custom_data:
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77 page_data.update(ctx.custom_data)
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78
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79 # Render content segments.
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80 repo = ctx.app.env.rendered_segments_repository
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81 if repo:
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82 cache_key = '%s:%s' % (ctx.uri, ctx.page_num)
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83 contents = repo.get(cache_key,
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84 lambda: _do_render_page_segments(page, page_data))
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85 else:
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86 contents = _do_render_page_segments(page, page_data)
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87
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88 # Render layout.
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89 layout_name = page.config.get('layout')
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90 if layout_name is None:
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91 layout_name = page.source.config.get('default_layout', 'default')
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92 null_names = ['', 'none', 'nil']
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93 if layout_name not in null_names:
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94 layout_data = build_layout_data(page, page_data, contents)
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95 output = render_layout(layout_name, page, layout_data)
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96 else:
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97 output = contents['content']
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98
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99 rp = RenderedPage(page, ctx.uri, ctx.page_num)
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100 rp.data = page_data
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101 rp.content = codecs.encode(output, 'utf8')
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102 rp.execution_info = eis.current_page_info
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103 return rp
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104 finally:
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105 eis.popPage()
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106
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107
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108 def render_page_segments(ctx):
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109 repo = ctx.app.env.rendered_segments_repository
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110 if repo:
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111 cache_key = '%s:%s' % (ctx.uri, ctx.page_num)
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112 return repo.get(cache_key,
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113 lambda: _do_render_page_segments_from_ctx(ctx))
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114
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115 return _do_render_page_segments_from_ctx(ctx)
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116
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117
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118 def _do_render_page_segments_from_ctx(ctx):
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119 eis = ctx.app.env.exec_info_stack
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120 eis.pushPage(ctx.page, PHASE_PAGE_FORMATTING, ctx)
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121 try:
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122 data_ctx = DataBuildingContext(ctx.page, ctx.uri, ctx.page_num)
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123 page_data = build_page_data(data_ctx)
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124 return _do_render_page_segments(ctx.page, page_data)
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125 finally:
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126 eis.popPage()
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127
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128
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129 def _do_render_page_segments(page, page_data):
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130 app = page.app
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131 engine_name = page.config.get('template_engine')
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132 format_name = page.config.get('format')
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133
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134 engine = get_template_engine(app, engine_name)
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135 if engine is None:
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136 raise PageRenderingError("Can't find template engine '%s'." % engine_name)
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137
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138 formatted_content = {}
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139 for seg_name, seg in page.raw_content.iteritems():
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140 seg_text = u''
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141 for seg_part in seg.parts:
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142 part_format = seg_part.fmt or format_name
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143 part_text = engine.renderString(seg_part.content, page_data,
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144 filename=page.path, line_offset=seg_part.line)
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145 part_text = format_text(app, part_format, part_text)
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146 seg_text += part_text
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147 formatted_content[seg_name] = seg_text
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148
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149 if seg_name == 'content':
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150 m = content_abstract_re.search(seg_text)
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151 if m:
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152 offset = m.start()
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153 content_abstract = seg_text[:offset]
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154 formatted_content['content.abstract'] = content_abstract
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155
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156 return formatted_content
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157
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158
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159 def render_layout(layout_name, page, layout_data):
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160 names = layout_name.split(',')
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161 default_template_engine = get_template_engine(page.app, None)
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162 default_exts = ['.' + e.lstrip('.') for e in default_template_engine.EXTENSIONS]
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163 full_names = []
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164 for name in names:
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165 if '.' not in name:
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166 full_names.append(name + '.html')
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167 for ext in default_exts:
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168 full_names.append(name + ext)
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169 else:
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170 full_names.append(name)
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171
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172 _, engine_name = os.path.splitext(full_names[0])
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173 engine_name = engine_name.lstrip('.')
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174 engine = get_template_engine(page.app, engine_name)
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175 if engine is None:
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176 raise PageRenderingError("No such template engine: %s" % engine_name)
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177 output = engine.renderFile(full_names, layout_data)
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178 return output
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179
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180
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181 def get_template_engine(app, engine_name):
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182 if engine_name == 'html':
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183 engine_name = None
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184 engine_name = engine_name or app.config.get('site/default_template_engine')
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185 for engine in app.plugin_loader.getTemplateEngines():
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186 if engine_name in engine.ENGINE_NAMES:
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187 return engine
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188 return None
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189
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190 def format_text(app, format_name, txt):
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191 format_name = format_name or app.config.get('site/default_format')
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192 for fmt in app.plugin_loader.getFormatters():
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193 if fmt.FORMAT_NAMES is None or format_name in fmt.FORMAT_NAMES:
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194 txt = fmt.render(format_name, txt)
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195 if fmt.OUTPUT_FORMAT is not None:
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196 format_name = fmt.OUTPUT_FORMAT
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197 return txt
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198