Mercurial > piecrust2

annotate piecrust/rendering.py @ 103:028df35a690e 2.0.0-alpha4

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Fix using `chef` outside of a website.
author Ludovic Chabant <ludovic@chabant.com>
date Mon, 15 Sep 2014 08:11:56 -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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16
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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)
3
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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