Mercurial > piecrust2

annotate piecrust/rendering.py @ 12:30a42341cfa8

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Define page slugs properly, avoid recursions with debug data.
author Ludovic Chabant <ludovic@chabant.com>
date Mon, 18 Aug 2014 16:49:54 -0700
parents 343d08ef5668
children 923699e816d0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
3
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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
12
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7 from piecrust.uriutil import get_slug
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8
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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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16
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17 class PageRenderingError(Exception):
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18 pass
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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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30a42341cfa8 Define page slugs properly, avoid recursions with debug data.
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53 def slug(self):
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54 return get_slug(self.page.app, self.uri)
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55
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56 @property
3
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57 def source_metadata(self):
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58 return self.page.source_metadata
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59
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60 def reset(self):
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61 self.used_pagination = None
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62
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63 def setPagination(self, paginator):
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64 if self.used_pagination is not None:
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65 raise Exception("Pagination has already been used.")
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66 self.used_pagination = paginator
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67
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68
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69 def render_page(ctx):
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70 eis = ctx.app.env.exec_info_stack
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71 eis.pushPage(ctx.page, PHASE_PAGE_RENDERING, ctx)
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72 try:
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73 page = ctx.page
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74
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75 # Build the data for both segment and layout rendering.
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76 data_ctx = DataBuildingContext(page, ctx.uri, ctx.page_num)
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77 data_ctx.pagination_source = ctx.pagination_source
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78 data_ctx.pagination_filter = ctx.pagination_filter
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79 page_data = build_page_data(data_ctx)
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80 if ctx.custom_data:
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81 page_data.update(ctx.custom_data)
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82
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83 # Render content segments.
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84 repo = ctx.app.env.rendered_segments_repository
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85 if repo:
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86 cache_key = '%s:%s' % (ctx.uri, ctx.page_num)
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87 contents = repo.get(cache_key,
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88 lambda: _do_render_page_segments(page, page_data))
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89 else:
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90 contents = _do_render_page_segments(page, page_data)
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91
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92 # Render layout.
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93 layout_name = page.config.get('layout')
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94 if layout_name is None:
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95 layout_name = page.source.config.get('default_layout', 'default')
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96 null_names = ['', 'none', 'nil']
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97 if layout_name not in null_names:
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98 layout_data = build_layout_data(page, page_data, contents)
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99 output = render_layout(layout_name, page, layout_data)
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100 else:
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101 output = contents['content']
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102
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103 rp = RenderedPage(page, ctx.uri, ctx.page_num)
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104 rp.data = page_data
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105 rp.content = output
3
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106 rp.execution_info = eis.current_page_info
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107 return rp
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108 finally:
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109 eis.popPage()
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110
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111
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112 def render_page_segments(ctx):
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113 repo = ctx.app.env.rendered_segments_repository
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114 if repo:
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115 cache_key = '%s:%s' % (ctx.uri, ctx.page_num)
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116 return repo.get(cache_key,
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117 lambda: _do_render_page_segments_from_ctx(ctx))
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118
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119 return _do_render_page_segments_from_ctx(ctx)
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120
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121
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122 def _do_render_page_segments_from_ctx(ctx):
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123 eis = ctx.app.env.exec_info_stack
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124 eis.pushPage(ctx.page, PHASE_PAGE_FORMATTING, ctx)
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125 try:
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126 data_ctx = DataBuildingContext(ctx.page, ctx.uri, ctx.page_num)
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127 page_data = build_page_data(data_ctx)
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128 return _do_render_page_segments(ctx.page, page_data)
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129 finally:
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130 eis.popPage()
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131
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132
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133 def _do_render_page_segments(page, page_data):
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134 app = page.app
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135 engine_name = page.config.get('template_engine')
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136 format_name = page.config.get('format')
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137
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138 engine = get_template_engine(app, engine_name)
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139 if engine is None:
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140 raise PageRenderingError("Can't find template engine '%s'." % engine_name)
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141
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142 formatted_content = {}
5
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143 for seg_name, seg in page.raw_content.items():
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144 seg_text = ''
3
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145 for seg_part in seg.parts:
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146 part_format = seg_part.fmt or format_name
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147 part_text = engine.renderString(seg_part.content, page_data,
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148 filename=page.path, line_offset=seg_part.line)
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149 part_text = format_text(app, part_format, part_text)
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150 seg_text += part_text
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151 formatted_content[seg_name] = seg_text
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152
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153 if seg_name == 'content':
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154 m = content_abstract_re.search(seg_text)
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155 if m:
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156 offset = m.start()
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157 content_abstract = seg_text[:offset]
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158 formatted_content['content.abstract'] = content_abstract
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159
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160 return formatted_content
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161
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162
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163 def render_layout(layout_name, page, layout_data):
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164 names = layout_name.split(',')
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165 default_template_engine = get_template_engine(page.app, None)
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166 default_exts = ['.' + e.lstrip('.') for e in default_template_engine.EXTENSIONS]
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167 full_names = []
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168 for name in names:
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169 if '.' not in name:
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170 full_names.append(name + '.html')
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171 for ext in default_exts:
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172 full_names.append(name + ext)
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173 else:
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174 full_names.append(name)
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175
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176 _, engine_name = os.path.splitext(full_names[0])
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177 engine_name = engine_name.lstrip('.')
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178 engine = get_template_engine(page.app, engine_name)
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179 if engine is None:
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180 raise PageRenderingError("No such template engine: %s" % engine_name)
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181 output = engine.renderFile(full_names, layout_data)
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182 return output
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183
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184
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185 def get_template_engine(app, engine_name):
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186 if engine_name == 'html':
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187 engine_name = None
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188 engine_name = engine_name or app.config.get('site/default_template_engine')
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189 for engine in app.plugin_loader.getTemplateEngines():
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190 if engine_name in engine.ENGINE_NAMES:
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191 return engine
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192 return None
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193
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194 def format_text(app, format_name, txt):
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195 format_name = format_name or app.config.get('site/default_format')
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196 for fmt in app.plugin_loader.getFormatters():
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197 if fmt.FORMAT_NAMES is None or format_name in fmt.FORMAT_NAMES:
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198 txt = fmt.render(format_name, txt)
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199 if fmt.OUTPUT_FORMAT is not None:
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200 format_name = fmt.OUTPUT_FORMAT
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201 return txt
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202