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annotate piecrust/rendering.py @ 7:343d08ef5668

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More PieCrust 3 fixes, and a couple of miscellaneous bug fixes.
author Ludovic Chabant <ludovic@chabant.com>
date Sat, 16 Aug 2014 15:07:22 -0700
parents 474c9882decf
children 30a42341cfa8
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
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7
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8
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9 logger = logging.getLogger(__name__)
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10
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11
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12 content_abstract_re = re.compile(r'^<!--\s*(more|(page)?break)\s*-->\s*$',
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13 re.MULTILINE)
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14
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15
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16 class PageRenderingError(Exception):
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17 pass
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18
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19
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20 class RenderedPage(object):
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21 def __init__(self, page, uri, num=1):
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22 self.page = page
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23 self.uri = uri
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24 self.num = num
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25 self.data = None
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26 self.content = None
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27 self.execution_info = None
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28
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29 @property
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30 def app(self):
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31 return self.page.app
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32
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33
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34 class PageRenderingContext(object):
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35 def __init__(self, page, uri, page_num=1):
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36 self.page = page
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37 self.uri = uri
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38 self.page_num = page_num
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39 self.pagination_source = None
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40 self.pagination_filter = None
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41 self.custom_data = None
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42 self.use_cache = False
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43 self.used_pagination = None
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44 self.used_source_names = set()
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45 self.used_taxonomy_terms = set()
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46
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47 @property
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48 def app(self):
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49 return self.page.app
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50
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51 @property
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52 def source_metadata(self):
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53 return self.page.source_metadata
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54
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55 def reset(self):
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56 self.used_pagination = None
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57
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58 def setPagination(self, paginator):
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59 if self.used_pagination is not None:
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60 raise Exception("Pagination has already been used.")
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61 self.used_pagination = paginator
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62
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63
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64 def render_page(ctx):
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65 eis = ctx.app.env.exec_info_stack
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66 eis.pushPage(ctx.page, PHASE_PAGE_RENDERING, ctx)
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67 try:
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68 page = ctx.page
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69
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70 # Build the data for both segment and layout rendering.
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71 data_ctx = DataBuildingContext(page, ctx.uri, ctx.page_num)
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72 data_ctx.pagination_source = ctx.pagination_source
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73 data_ctx.pagination_filter = ctx.pagination_filter
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74 page_data = build_page_data(data_ctx)
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75 if ctx.custom_data:
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76 page_data.update(ctx.custom_data)
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77
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78 # Render content segments.
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79 repo = ctx.app.env.rendered_segments_repository
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80 if repo:
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81 cache_key = '%s:%s' % (ctx.uri, ctx.page_num)
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82 contents = repo.get(cache_key,
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83 lambda: _do_render_page_segments(page, page_data))
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84 else:
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85 contents = _do_render_page_segments(page, page_data)
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86
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87 # Render layout.
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88 layout_name = page.config.get('layout')
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89 if layout_name is None:
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90 layout_name = page.source.config.get('default_layout', 'default')
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91 null_names = ['', 'none', 'nil']
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92 if layout_name not in null_names:
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93 layout_data = build_layout_data(page, page_data, contents)
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94 output = render_layout(layout_name, page, layout_data)
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95 else:
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96 output = contents['content']
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97
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98 rp = RenderedPage(page, ctx.uri, ctx.page_num)
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99 rp.data = page_data
7
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100 rp.content = output
3
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101 rp.execution_info = eis.current_page_info
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102 return rp
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103 finally:
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104 eis.popPage()
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105
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106
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107 def render_page_segments(ctx):
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108 repo = ctx.app.env.rendered_segments_repository
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109 if repo:
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110 cache_key = '%s:%s' % (ctx.uri, ctx.page_num)
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111 return repo.get(cache_key,
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112 lambda: _do_render_page_segments_from_ctx(ctx))
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113
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114 return _do_render_page_segments_from_ctx(ctx)
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115
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116
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117 def _do_render_page_segments_from_ctx(ctx):
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118 eis = ctx.app.env.exec_info_stack
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119 eis.pushPage(ctx.page, PHASE_PAGE_FORMATTING, ctx)
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120 try:
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121 data_ctx = DataBuildingContext(ctx.page, ctx.uri, ctx.page_num)
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122 page_data = build_page_data(data_ctx)
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123 return _do_render_page_segments(ctx.page, page_data)
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124 finally:
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125 eis.popPage()
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126
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127
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128 def _do_render_page_segments(page, page_data):
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129 app = page.app
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130 engine_name = page.config.get('template_engine')
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131 format_name = page.config.get('format')
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132
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133 engine = get_template_engine(app, engine_name)
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134 if engine is None:
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135 raise PageRenderingError("Can't find template engine '%s'." % engine_name)
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136
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137 formatted_content = {}
5
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138 for seg_name, seg in page.raw_content.items():
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139 seg_text = ''
3
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140 for seg_part in seg.parts:
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141 part_format = seg_part.fmt or format_name
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142 part_text = engine.renderString(seg_part.content, page_data,
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143 filename=page.path, line_offset=seg_part.line)
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144 part_text = format_text(app, part_format, part_text)
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145 seg_text += part_text
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146 formatted_content[seg_name] = seg_text
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147
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148 if seg_name == 'content':
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149 m = content_abstract_re.search(seg_text)
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150 if m:
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151 offset = m.start()
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152 content_abstract = seg_text[:offset]
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153 formatted_content['content.abstract'] = content_abstract
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154
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155 return formatted_content
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156
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157
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158 def render_layout(layout_name, page, layout_data):
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159 names = layout_name.split(',')
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160 default_template_engine = get_template_engine(page.app, None)
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161 default_exts = ['.' + e.lstrip('.') for e in default_template_engine.EXTENSIONS]
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162 full_names = []
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163 for name in names:
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164 if '.' not in name:
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165 full_names.append(name + '.html')
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166 for ext in default_exts:
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167 full_names.append(name + ext)
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168 else:
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169 full_names.append(name)
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170
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171 _, engine_name = os.path.splitext(full_names[0])
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172 engine_name = engine_name.lstrip('.')
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173 engine = get_template_engine(page.app, engine_name)
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174 if engine is None:
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175 raise PageRenderingError("No such template engine: %s" % engine_name)
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176 output = engine.renderFile(full_names, layout_data)
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177 return output
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178
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179
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180 def get_template_engine(app, engine_name):
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181 if engine_name == 'html':
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182 engine_name = None
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183 engine_name = engine_name or app.config.get('site/default_template_engine')
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184 for engine in app.plugin_loader.getTemplateEngines():
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185 if engine_name in engine.ENGINE_NAMES:
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186 return engine
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187 return None
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188
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189 def format_text(app, format_name, txt):
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190 format_name = format_name or app.config.get('site/default_format')
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191 for fmt in app.plugin_loader.getFormatters():
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192 if fmt.FORMAT_NAMES is None or format_name in fmt.FORMAT_NAMES:
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193 txt = fmt.render(format_name, txt)
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194 if fmt.OUTPUT_FORMAT is not None:
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195 format_name = fmt.OUTPUT_FORMAT
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196 return txt
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197