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/lib/python3.6/site-packages/jinja2/optimizer.py

# -*- coding: utf-8 -*-
"""
    jinja2.optimizer
    ~~~~~~~~~~~~~~~~

    The jinja optimizer is currently trying to constant fold a few expressions
    and modify the AST in place so that it should be easier to evaluate it.

    Because the AST does not contain all the scoping information and the
    compiler has to find that out, we cannot do all the optimizations we
    want.  For example loop unrolling doesn't work because unrolled loops would
    have a different scoping.

    The solution would be a second syntax tree that has the scoping rules stored.

    :copyright: (c) 2017 by the Jinja Team.
    :license: BSD.
"""
from jinja2 import nodes
from jinja2.visitor import NodeTransformer


def optimize(node, environment):
    """The context hint can be used to perform an static optimization
    based on the context given."""
    optimizer = Optimizer(environment)
    return optimizer.visit(node)


class Optimizer(NodeTransformer):

    def __init__(self, environment):
        self.environment = environment

    def fold(self, node, eval_ctx=None):
        """Do constant folding."""
        node = self.generic_visit(node)
        try:
            return nodes.Const.from_untrusted(node.as_const(eval_ctx),
                                              lineno=node.lineno,
                                              environment=self.environment)
        except nodes.Impossible:
            return node

    visit_Add = visit_Sub = visit_Mul = visit_Div = visit_FloorDiv = \
    visit_Pow = visit_Mod = visit_And = visit_Or = visit_Pos = visit_Neg = \
    visit_Not = visit_Compare = visit_Getitem = visit_Getattr = visit_Call = \
    visit_Filter = visit_Test = visit_CondExpr = fold
    del fold

Name	Size	Perms	Modified	Actions
__pycache__ DIR	-	drwxr-xr-x	2025-04-06 18:04:22	Edit Download recursive recursive
asyncfilters.py	4.05 KB	lrw-r--r--	2019-04-06 17:10:11	Edit Download recursive recursive
asyncsupport.py	7.69 KB	lrw-r--r--	2019-04-06 17:10:11	Edit Download recursive recursive
bccache.py	12.49 KB	lrw-r--r--	2019-03-19 19:49:57	Edit Download recursive recursive
compiler.py	63.85 KB	lrw-r--r--	2019-04-06 17:10:11	Edit Download recursive recursive
constants.py	1.59 KB	lrw-r--r--	2019-03-19 19:47:45	Edit Download recursive recursive
debug.py	11.76 KB	lrw-r--r--	2019-03-19 19:47:45	Edit Download recursive recursive
defaults.py	1.37 KB	lrw-r--r--	2019-03-19 19:49:57	Edit Download recursive recursive
environment.py	49.66 KB	lrw-r--r--	2019-04-06 17:10:11	Edit Download recursive recursive
exceptions.py	4.32 KB	lrw-r--r--	2019-03-19 19:47:45	Edit Download recursive recursive
ext.py	23.93 KB	lrw-r--r--	2019-04-06 17:10:11	Edit Download recursive recursive
filters.py	36.27 KB	lrw-r--r--	2025-03-31 07:43:47	Edit Download recursive recursive
idtracking.py	8.98 KB	lrw-r--r--	2019-03-19 19:49:57	Edit Download recursive recursive
lexer.py	27.89 KB	lrw-r--r--	2019-03-19 19:49:57	Edit Download recursive recursive
loaders.py	16.97 KB	lrw-r--r--	2019-03-19 19:47:45	Edit Download recursive recursive
meta.py	4.24 KB	lrw-r--r--	2019-03-19 19:47:45	Edit Download recursive recursive
nativetypes.py	7.14 KB	lrw-r--r--	2019-04-06 17:10:11	Edit Download recursive recursive
nodes.py	30.13 KB	lrw-r--r--	2019-04-06 17:10:11	Edit Download recursive recursive
optimizer.py	1.68 KB	lrw-r--r--	2019-03-19 19:47:45	Edit Download recursive recursive
parser.py	35.03 KB	lrw-r--r--	2019-04-06 17:10:11	Edit Download recursive recursive
runtime.py	27.10 KB	lrw-r--r--	2019-04-06 17:10:11	Edit Download recursive recursive
sandbox.py	17.08 KB	lrw-r--r--	2025-03-31 07:43:47	Edit Download recursive recursive
tests.py	4.14 KB	lrw-r--r--	2019-04-06 17:10:11	Edit Download recursive recursive
utils.py	20.29 KB	lrw-r--r--	2025-03-31 07:43:47	Edit Download recursive recursive
visitor.py	3.24 KB	lrw-r--r--	2019-03-19 19:47:45	Edit Download recursive recursive
_compat.py	2.54 KB	lrw-r--r--	2019-04-06 17:10:11	Edit Download recursive recursive
_identifier.py	1.69 KB	lrw-r--r--	2019-03-19 19:49:57	Edit Download recursive recursive
__init__.py	2.55 KB	lrw-r--r--	2019-04-06 17:50:57	Edit Download recursive recursive

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