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annotate piecrust/templating/base.py @ 440:32c7c2d219d2

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performance: Refactor how data is managed to reduce copying. * Make use of `collections.abc.Mapping` to better identify things that are supposed to look like dictionaries. * Instead of handling "overlay" of data in a dict tree in each different data object, make all objects `Mapping`s and handle merging at a higher level with the new `MergedMapping` object. * Since this new object is read-only, remove the need for deep-copying of app and page configurations. * Split data classes into separate modules.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 28 Jun 2015 08:22:39 -0700
parents 28444014ce7d
children 96d363e2da4b
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3 class TemplateNotFoundError(Exception):
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4 pass
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7 class TemplatingError(Exception):
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8 def __init__(self, message, filename=None, lineno=-1):
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9 super(TemplatingError, self).__init__()
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10 self.message = message
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11 self.filename = filename
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12 self.lineno = lineno
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13
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14 def __str__(self):
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15 msg = ''
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16 if self.filename:
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17 msg += self.filename
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18 if self.lineno >= 0:
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19 msg += ', line %d' % self.lineno
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20 msg += ': ' + self.message
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21 return msg
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24 class TemplateEngine(object):
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25 EXTENSIONS = []
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27 def initialize(self, app):
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28 self.app = app
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30 def renderString(self, txt, data, filename=None, line_offset=0):
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31 raise NotImplementedError()
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33 def renderFile(self, paths, data):
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34 raise NotImplementedError()