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annotate piecrust/sources/base.py @ 852:4850f8c21b6e

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core: Start of the big refactor for PieCrust 3.0. * Everything is a `ContentSource`, including assets directories. * Most content sources are subclasses of the base file-system source. * A source is processed by a "pipeline", and there are 2 built-in pipelines, one for assets and one for pages. The asset pipeline is vaguely functional, but the page pipeline is completely broken right now. * Rewrite the baking process as just running appropriate pipelines on each content item. This should allow for better parallelization.
author Ludovic Chabant <ludovic@chabant.com>
date Wed, 17 May 2017 00:11:48 -0700
parents 7f3043f9f26f
children f070a4fc033c
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1 import logging
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2 import collections
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4
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5 # Source realms, to differentiate sources in the site itself ('User')
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6 # and sources in the site's theme ('Theme').
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7 REALM_USER = 0
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8 REALM_THEME = 1
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9 REALM_NAMES = {
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10 REALM_USER: 'User',
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11 REALM_THEME: 'Theme'}
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13
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14 # Types of relationships a content source can be asked for.
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15 REL_ASSETS = 1
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18 logger = logging.getLogger(__name__)
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21 class SourceNotFoundError(Exception):
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22 pass
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24
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25 class InsufficientRouteParameters(Exception):
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26 pass
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29 class AbortedSourceUseError(Exception):
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30 pass
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33 class GeneratedContentException(Exception):
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34 pass
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37 CONTENT_TYPE_PAGE = 0
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38 CONTENT_TYPE_ASSET = 1
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40
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41 class ContentItem:
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42 """ Describes a piece of content.
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43 """
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44 def __init__(self, spec, metadata):
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45 self.spec = spec
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46 self.metadata = metadata
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47
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48 @property
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49 def is_group(self):
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50 return False
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52
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53 class ContentGroup:
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54 """ Describes a group of `ContentItem`s.
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55 """
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56 def __init__(self, spec, metadata):
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57 self.spec = spec
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58 self.metadata = metadata
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59
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60 @property
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61 def is_group(self):
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62 return True
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64
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65 class ContentSource:
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66 """ A source for content.
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67 """
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68 def __init__(self, app, name, config):
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69 self.app = app
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70 self.name = name
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71 self.config = config or {}
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73 @property
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74 def is_theme_source(self):
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75 return self.config['realm'] == REALM_THEME
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77 @property
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78 def root_dir(self):
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79 if self.is_theme_source:
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80 return self.app.theme_dir
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81 return self.app.root_dir
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82
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83 def openItem(self, item, mode='r'):
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84 raise NotImplementedError()
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85
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86 def getItemMtime(self, item):
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87 raise NotImplementedError()
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88
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89 def getAllContents(self):
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90 stack = collections.deque()
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91 stack.append(None)
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92 while len(stack) > 0:
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93 cur = stack.popleft()
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94 try:
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95 contents = self.getContents(cur)
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96 except GeneratedContentException:
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97 continue
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98 if contents is not None:
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99 for c in contents:
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100 if c.is_group:
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101 stack.append(c)
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102 else:
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103 yield c
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104
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105 def getContents(self, group):
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106 raise NotImplementedError("'%s' doesn't implement 'getContents'." %
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107 self.__class__)
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108
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109 def getRelatedContents(self, item, relationship):
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110 raise NotImplementedError()
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111
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112 def findContent(self, route_params):
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113 raise NotImplementedError()
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114
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115 def getSupportedRouteParameters(self):
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116 raise NotImplementedError()
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117
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118 def prepareRenderContext(self, ctx):
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119 pass
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120
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121 def onRouteFunctionUsed(self, route_params):
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122 pass
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123
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124 def describe(self):
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125 return None
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126