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annotate piecrust/rendering.py @ 183:fff195335d0a

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render: When a template engine can't be found, show the correct name in the error. Raise the exception related to a template engine not being found when we still have the actual name we were looking for.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 04 Jan 2015 14:57:37 -0800
parents e9a3d405e18f
children 27d623a241c6
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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.templating.base import TemplateNotFoundError, TemplatingError
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8 from piecrust.uriutil import get_slug
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10
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11 logger = logging.getLogger(__name__)
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14 content_abstract_re = re.compile(r'^<!--\s*(more|(page)?break)\s*-->\s*$',
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15 re.MULTILINE)
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17
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18 class PageRenderingError(Exception):
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19 pass
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22 class TemplateEngineNotFound(Exception):
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23 pass
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26 class RenderedPage(object):
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27 def __init__(self, page, uri, num=1):
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28 self.page = page
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29 self.uri = uri
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30 self.num = num
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31 self.data = None
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32 self.content = None
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33 self.execution_info = None
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34
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35 @property
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36 def app(self):
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37 return self.page.app
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40 PASS_NONE = 0
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41 PASS_FORMATTING = 1
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42 PASS_RENDERING = 2
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44
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45 class PageRenderingContext(object):
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46 def __init__(self, page, uri, page_num=1, force_render=False):
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47 self.page = page
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48 self.uri = uri
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49 self.page_num = page_num
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50 self.force_render = force_render
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51 self.pagination_source = None
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52 self.pagination_filter = None
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53 self.custom_data = None
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54 self.use_cache = False
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55 self.used_assets = None
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56 self.used_pagination = None
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57 self.used_source_names = set()
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58 self.used_taxonomy_terms = set()
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59 self.current_pass = PASS_NONE
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60
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61 @property
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62 def app(self):
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63 return self.page.app
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64
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65 @property
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66 def slug(self):
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67 return get_slug(self.page.app, self.uri)
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68
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69 @property
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70 def source_metadata(self):
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71 return self.page.source_metadata
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72
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73 def reset(self):
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74 self.used_pagination = None
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75
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76 def setPagination(self, paginator):
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77 if self.used_pagination is not None:
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78 raise Exception("Pagination has already been used.")
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79 self.used_pagination = paginator
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80 self.addUsedSource(paginator._source)
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81
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82 def addUsedSource(self, source):
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83 if isinstance(source, PageSource):
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84 self.used_source_names.add((source.name, self.current_pass))
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85
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86
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87 def render_page(ctx):
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88 eis = ctx.app.env.exec_info_stack
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89 eis.pushPage(ctx.page, ctx)
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90 try:
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91 page = ctx.page
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92
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93 # Build the data for both segment and layout rendering.
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94 data_ctx = DataBuildingContext(page, ctx.uri, ctx.page_num)
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95 data_ctx.pagination_source = ctx.pagination_source
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96 data_ctx.pagination_filter = ctx.pagination_filter
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97 page_data = build_page_data(data_ctx)
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98 if ctx.custom_data:
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99 page_data.update(ctx.custom_data)
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100
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101 # Render content segments.
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102 ctx.current_pass = PASS_FORMATTING
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103 repo = ctx.app.env.rendered_segments_repository
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104 if repo and not ctx.force_render:
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105 cache_key = '%s:%s' % (ctx.uri, ctx.page_num)
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106 page_time = page.path_mtime
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107 contents = repo.get(
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108 cache_key,
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109 lambda: _do_render_page_segments(page, page_data),
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110 fs_cache_time=page_time)
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111 else:
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112 contents = _do_render_page_segments(page, page_data)
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113
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114 # Render layout.
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115 ctx.current_pass = PASS_RENDERING
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116 layout_name = page.config.get('layout')
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117 if layout_name is None:
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118 layout_name = page.source.config.get('default_layout', 'default')
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119 null_names = ['', 'none', 'nil']
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120 if layout_name not in null_names:
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121 layout_data = build_layout_data(page, page_data, contents)
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122 output = render_layout(layout_name, page, layout_data)
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123 else:
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124 output = contents['content']
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125
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126 rp = RenderedPage(page, ctx.uri, ctx.page_num)
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127 rp.data = page_data
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128 rp.content = output
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129 rp.execution_info = eis.current_page_info
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130 return rp
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131 finally:
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132 ctx.current_pass = PASS_NONE
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133 eis.popPage()
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134
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135
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136 def render_page_segments(ctx):
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137 repo = ctx.app.env.rendered_segments_repository
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138 if repo:
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139 cache_key = '%s:%s' % (ctx.uri, ctx.page_num)
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140 return repo.get(cache_key,
50
2fec3ee1298f Properly override pages between realms.
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diff changeset
141 lambda: _do_render_page_segments_from_ctx(ctx),
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142 fs_cache_time=ctx.page.path_mtime)
3
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143
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144 return _do_render_page_segments_from_ctx(ctx)
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145
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146
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147 def _do_render_page_segments_from_ctx(ctx):
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148 eis = ctx.app.env.exec_info_stack
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149 eis.pushPage(ctx.page, ctx)
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150 ctx.current_pass = PASS_FORMATTING
3
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151 try:
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152 data_ctx = DataBuildingContext(ctx.page, ctx.uri, ctx.page_num)
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153 page_data = build_page_data(data_ctx)
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154 return _do_render_page_segments(ctx.page, page_data)
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155 finally:
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156 ctx.current_pass = PASS_NONE
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157 eis.popPage()
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158
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159
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160 def _do_render_page_segments(page, page_data):
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161 app = page.app
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162 engine_name = page.config.get('template_engine')
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163 format_name = page.config.get('format')
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164
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165 engine = get_template_engine(app, engine_name)
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166
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167 formatted_content = {}
5
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168 for seg_name, seg in page.raw_content.items():
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169 seg_text = ''
3
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170 for seg_part in seg.parts:
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171 part_format = seg_part.fmt or format_name
128
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diff changeset
172 try:
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173 part_text = engine.renderString(
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174 seg_part.content, page_data,
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175 filename=page.path)
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176 except TemplatingError as err:
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177 err.lineno += seg_part.line
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178 raise err
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diff changeset
179
3
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180 part_text = format_text(app, part_format, part_text)
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181 seg_text += part_text
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182 formatted_content[seg_name] = seg_text
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183
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184 if seg_name == 'content':
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185 m = content_abstract_re.search(seg_text)
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186 if m:
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187 offset = m.start()
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188 content_abstract = seg_text[:offset]
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189 formatted_content['content.abstract'] = content_abstract
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190
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191 return formatted_content
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192
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193
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194 def render_layout(layout_name, page, layout_data):
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195 names = layout_name.split(',')
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196 default_template_engine = get_template_engine(page.app, None)
183
fff195335d0a render: When a template engine can't be found, show the correct name in the error.
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diff changeset
197 default_exts = ['.' + e.lstrip('.')
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diff changeset
198 for e in default_template_engine.EXTENSIONS]
3
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199 full_names = []
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200 for name in names:
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201 if '.' not in name:
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202 full_names.append(name + '.html')
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203 for ext in default_exts:
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204 full_names.append(name + ext)
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205 else:
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206 full_names.append(name)
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207
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208 _, engine_name = os.path.splitext(full_names[0])
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209 engine_name = engine_name.lstrip('.')
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210 engine = get_template_engine(page.app, engine_name)
183
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parents: 174
diff changeset
211
153
1c3d229158ba Make a nice error message when a layout hasn't been found.
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parents: 128
diff changeset
212 try:
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diff changeset
213 output = engine.renderFile(full_names, layout_data)
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diff changeset
214 except TemplateNotFoundError as ex:
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diff changeset
215 msg = "Can't find template for page: %s\n" % page.path
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diff changeset
216 msg += "Looked for: %s" % ', '.join(full_names)
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diff changeset
217 raise Exception(msg) from ex
3
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218 return output
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219
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220
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221 def get_template_engine(app, engine_name):
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222 if engine_name == 'html':
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223 engine_name = None
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224 engine_name = engine_name or app.config.get('site/default_template_engine')
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225 for engine in app.plugin_loader.getTemplateEngines():
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226 if engine_name in engine.ENGINE_NAMES:
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227 return engine
183
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diff changeset
228 raise TemplateEngineNotFound("No such template engine: %s" % engine_name)
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diff changeset
229
3
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230
128
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diff changeset
231 def format_text(app, format_name, txt, exact_format=False):
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diff changeset
232 if exact_format and not format_name:
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diff changeset
233 raise Exception("You need to specify a format name.")
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diff changeset
234
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diff changeset
235 format_count = 0
3
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236 format_name = format_name or app.config.get('site/default_format')
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237 for fmt in app.plugin_loader.getFormatters():
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238 if fmt.FORMAT_NAMES is None or format_name in fmt.FORMAT_NAMES:
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239 txt = fmt.render(format_name, txt)
128
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diff changeset
240 format_count += 1
3
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241 if fmt.OUTPUT_FORMAT is not None:
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242 format_name = fmt.OUTPUT_FORMAT
128
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diff changeset
243 if exact_format and format_count == 0:
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diff changeset
244 raise Exception("No such format: %s" % format_name)
3
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245 return txt
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246