Mercurial > piecrust2

annotate piecrust/rendering.py @ 111:208c652551a3

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Quick fix for making the server correctly update referenced pages. Disable the file-system cache for rendered segments when in server mode. We can bring this optimization back when we're actually using the baking record in the server too in order to know dependencies.
author Ludovic Chabant <ludovic@chabant.com>
date Thu, 16 Oct 2014 17:03:42 -0700
parents 0445a2232de7
children 28444014ce7d
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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.uriutil import get_slug
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9
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10 logger = logging.getLogger(__name__)
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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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17 class PageRenderingError(Exception):
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18 pass
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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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30 @property
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31 def app(self):
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32 return self.page.app
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34
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35 PASS_NONE = 0
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36 PASS_FORMATTING = 1
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37 PASS_RENDERING = 2
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39
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40 class PageRenderingContext(object):
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41 def __init__(self, page, uri, page_num=1):
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42 self.page = page
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43 self.uri = uri
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44 self.page_num = page_num
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45 self.pagination_source = None
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46 self.pagination_filter = None
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47 self.custom_data = None
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48 self.use_cache = False
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49 self.used_assets = None
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50 self.used_pagination = None
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51 self.used_source_names = set()
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52 self.used_taxonomy_terms = set()
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53 self.current_pass = PASS_NONE
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54
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55 @property
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56 def app(self):
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57 return self.page.app
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58
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59 @property
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60 def slug(self):
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61 return get_slug(self.page.app, self.uri)
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62
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63 @property
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64 def source_metadata(self):
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65 return self.page.source_metadata
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66
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67 def reset(self):
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68 self.used_pagination = None
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69
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70 def setPagination(self, paginator):
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71 if self.used_pagination is not None:
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72 raise Exception("Pagination has already been used.")
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73 self.used_pagination = paginator
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74 self.addUsedSource(paginator._source)
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75
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76 def addUsedSource(self, source):
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77 if isinstance(source, PageSource):
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78 self.used_source_names.add((source.name, self.current_pass))
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79
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80
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81 def render_page(ctx):
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82 eis = ctx.app.env.exec_info_stack
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83 eis.pushPage(ctx.page, ctx)
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84 try:
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85 page = ctx.page
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86
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87 # Build the data for both segment and layout rendering.
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88 data_ctx = DataBuildingContext(page, ctx.uri, ctx.page_num)
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89 data_ctx.pagination_source = ctx.pagination_source
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90 data_ctx.pagination_filter = ctx.pagination_filter
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91 page_data = build_page_data(data_ctx)
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92 if ctx.custom_data:
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93 page_data.update(ctx.custom_data)
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94
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95 # Render content segments.
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96 ctx.current_pass = PASS_FORMATTING
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97 repo = ctx.app.env.rendered_segments_repository
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98 if repo:
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99 cache_key = '%s:%s' % (ctx.uri, ctx.page_num)
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100 page_time = page.path_mtime
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101 contents = repo.get(cache_key,
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102 lambda: _do_render_page_segments(page, page_data),
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103 fs_cache_time=page_time)
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104 else:
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105 contents = _do_render_page_segments(page, page_data)
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106
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107 # Render layout.
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108 ctx.current_pass = PASS_RENDERING
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109 layout_name = page.config.get('layout')
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110 if layout_name is None:
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111 layout_name = page.source.config.get('default_layout', 'default')
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112 null_names = ['', 'none', 'nil']
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113 if layout_name not in null_names:
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114 layout_data = build_layout_data(page, page_data, contents)
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115 output = render_layout(layout_name, page, layout_data)
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116 else:
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117 output = contents['content']
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118
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119 rp = RenderedPage(page, ctx.uri, ctx.page_num)
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120 rp.data = page_data
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121 rp.content = output
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122 rp.execution_info = eis.current_page_info
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123 return rp
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124 finally:
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125 ctx.current_pass = PASS_NONE
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126 eis.popPage()
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127
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128
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129 def render_page_segments(ctx):
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130 repo = ctx.app.env.rendered_segments_repository
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131 if repo:
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132 cache_key = '%s:%s' % (ctx.uri, ctx.page_num)
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133 return repo.get(cache_key,
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134 lambda: _do_render_page_segments_from_ctx(ctx),
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135 fs_cache_time=ctx.page.path_mtime)
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136
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137 return _do_render_page_segments_from_ctx(ctx)
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138
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139
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140 def _do_render_page_segments_from_ctx(ctx):
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141 eis = ctx.app.env.exec_info_stack
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142 eis.pushPage(ctx.page, ctx)
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143 ctx.current_pass = PASS_FORMATTING
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144 try:
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145 data_ctx = DataBuildingContext(ctx.page, ctx.uri, ctx.page_num)
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146 page_data = build_page_data(data_ctx)
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147 return _do_render_page_segments(ctx.page, page_data)
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148 finally:
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149 ctx.current_pass = PASS_NONE
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150 eis.popPage()
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151
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152
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153 def _do_render_page_segments(page, page_data):
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154 app = page.app
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155 engine_name = page.config.get('template_engine')
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156 format_name = page.config.get('format')
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157
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158 engine = get_template_engine(app, engine_name)
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159 if engine is None:
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160 raise PageRenderingError("Can't find template engine '%s'." % engine_name)
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161
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162 formatted_content = {}
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163 for seg_name, seg in page.raw_content.items():
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164 seg_text = ''
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165 for seg_part in seg.parts:
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166 part_format = seg_part.fmt or format_name
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167 part_text = engine.renderString(seg_part.content, page_data,
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168 filename=page.path, line_offset=seg_part.line)
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169 part_text = format_text(app, part_format, part_text)
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170 seg_text += part_text
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171 formatted_content[seg_name] = seg_text
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172
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173 if seg_name == 'content':
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174 m = content_abstract_re.search(seg_text)
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175 if m:
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176 offset = m.start()
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177 content_abstract = seg_text[:offset]
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178 formatted_content['content.abstract'] = content_abstract
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179
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180 return formatted_content
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181
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182
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183 def render_layout(layout_name, page, layout_data):
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184 names = layout_name.split(',')
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185 default_template_engine = get_template_engine(page.app, None)
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186 default_exts = ['.' + e.lstrip('.') for e in default_template_engine.EXTENSIONS]
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187 full_names = []
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188 for name in names:
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189 if '.' not in name:
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190 full_names.append(name + '.html')
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191 for ext in default_exts:
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192 full_names.append(name + ext)
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193 else:
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194 full_names.append(name)
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195
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196 _, engine_name = os.path.splitext(full_names[0])
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197 engine_name = engine_name.lstrip('.')
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198 engine = get_template_engine(page.app, engine_name)
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199 if engine is None:
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200 raise PageRenderingError("No such template engine: %s" % engine_name)
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201 output = engine.renderFile(full_names, layout_data)
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202 return output
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203
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204
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205 def get_template_engine(app, engine_name):
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206 if engine_name == 'html':
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207 engine_name = None
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208 engine_name = engine_name or app.config.get('site/default_template_engine')
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209 for engine in app.plugin_loader.getTemplateEngines():
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210 if engine_name in engine.ENGINE_NAMES:
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211 return engine
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212 return None
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213
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214 def format_text(app, format_name, txt):
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215 format_name = format_name or app.config.get('site/default_format')
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216 for fmt in app.plugin_loader.getFormatters():
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217 if fmt.FORMAT_NAMES is None or format_name in fmt.FORMAT_NAMES:
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218 txt = fmt.render(format_name, txt)
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219 if fmt.OUTPUT_FORMAT is not None:
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220 format_name = fmt.OUTPUT_FORMAT
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221 return txt
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222