Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/jinja2/optimizer.py @ 0:4f3585e2f14b draft default tip
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 # -*- coding: utf-8 -*- |
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2 """The optimizer tries to constant fold expressions and modify the AST |
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3 in place so that it should be faster to evaluate. |
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4 |
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5 Because the AST does not contain all the scoping information and the |
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6 compiler has to find that out, we cannot do all the optimizations we |
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7 want. For example, loop unrolling doesn't work because unrolled loops |
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8 would have a different scope. The solution would be a second syntax tree |
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9 that stored the scoping rules. |
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10 """ |
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11 from . import nodes |
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12 from .visitor import NodeTransformer |
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13 |
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14 |
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15 def optimize(node, environment): |
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16 """The context hint can be used to perform an static optimization |
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17 based on the context given.""" |
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18 optimizer = Optimizer(environment) |
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19 return optimizer.visit(node) |
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20 |
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21 |
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22 class Optimizer(NodeTransformer): |
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23 def __init__(self, environment): |
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24 self.environment = environment |
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25 |
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26 def generic_visit(self, node, *args, **kwargs): |
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27 node = super(Optimizer, self).generic_visit(node, *args, **kwargs) |
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28 |
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29 # Do constant folding. Some other nodes besides Expr have |
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30 # as_const, but folding them causes errors later on. |
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31 if isinstance(node, nodes.Expr): |
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32 try: |
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33 return nodes.Const.from_untrusted( |
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34 node.as_const(args[0] if args else None), |
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35 lineno=node.lineno, |
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36 environment=self.environment, |
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37 ) |
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38 except nodes.Impossible: |
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39 pass |
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40 |
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41 return node |