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//opt/alt/python37/lib/python3.7/site-packages/jinja2/optimizer.py

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"""The optimizer tries to constant fold expressions and modify the AST
in place so that it should be faster to evaluate.

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 scope. The solution would be a second syntax tree
that stored the scoping rules.
"""
import typing as t

from . import nodes
from .visitor import NodeTransformer

if t.TYPE_CHECKING:
    from .environment import Environment

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

class Optimizer(NodeTransformer):
    def __init__(self, environment: "t.Optional[Environment]") -> None:
        self.environment = environment

def generic_visit(
        self, node: nodes.Node, *args: t.Any, **kwargs: t.Any
    ) -> nodes.Node:
        node = super().generic_visit(node, *args, **kwargs)

# Do constant folding. Some other nodes besides Expr have
        # as_const, but folding them causes errors later on.
        if isinstance(node, nodes.Expr):
            try:
                return nodes.Const.from_untrusted(
                    node.as_const(args[0] if args else None),
                    lineno=node.lineno,
                    environment=self.environment,
                )
            except nodes.Impossible:
                pass

return node

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__pycache__ DIR	-	drwxr-xr-x	2024-03-03 23:11:10	Edit Download recursive recursive
async_utils.py	1.90 KB	lrw-r--r--	2021-11-09 17:17:58	Edit Download recursive recursive
bccache.py	12.37 KB	lrw-r--r--	2021-10-04 20:41:58	Edit Download recursive recursive
compiler.py	70.52 KB	lrw-r--r--	2021-11-09 16:37:43	Edit Download recursive recursive
constants.py	1.40 KB	lrw-r--r--	2021-04-05 17:47:37	Edit Download recursive recursive
debug.py	8.29 KB	lrw-r--r--	2021-11-09 17:17:58	Edit Download recursive recursive
defaults.py	1.24 KB	lrw-r--r--	2021-05-10 13:52:40	Edit Download recursive recursive
environment.py	59.55 KB	lrw-r--r--	2021-11-09 18:10:36	Edit Download recursive recursive
exceptions.py	4.95 KB	lrw-r--r--	2021-05-10 13:52:40	Edit Download recursive recursive
ext.py	31.37 KB	lrw-r--r--	2021-05-14 01:01:18	Edit Download recursive recursive
filters.py	51.38 KB	lrw-r--r--	2021-10-04 20:41:58	Edit Download recursive recursive
idtracking.py	10.47 KB	lrw-r--r--	2021-08-10 13:34:22	Edit Download recursive recursive
lexer.py	29.23 KB	lrw-r--r--	2021-10-04 20:41:58	Edit Download recursive recursive
loaders.py	22.22 KB	lrw-r--r--	2021-11-09 20:21:27	Edit Download recursive recursive
meta.py	4.29 KB	lrw-r--r--	2021-05-10 13:52:40	Edit Download recursive recursive
nativetypes.py	3.88 KB	lrw-r--r--	2021-11-09 17:17:58	Edit Download recursive recursive
nodes.py	33.74 KB	lrw-r--r--	2021-11-09 17:18:01	Edit Download recursive recursive
optimizer.py	1.61 KB	lrw-r--r--	2021-05-10 13:52:40	Edit Download recursive recursive
parser.py	38.83 KB	lrw-r--r--	2021-05-14 01:01:13	Edit Download recursive recursive
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sandbox.py	14.26 KB	lrw-r--r--	2021-05-10 13:52:40	Edit Download recursive recursive
tests.py	5.77 KB	lrw-r--r--	2021-04-10 17:20:38	Edit Download recursive recursive
utils.py	26.34 KB	lrw-r--r--	2021-10-04 20:41:58	Edit Download recursive recursive
visitor.py	3.49 KB	lrw-r--r--	2021-05-10 13:52:40	Edit Download recursive recursive
_identifier.py	1.73 KB	lrw-r--r--	2020-02-17 17:14:56	Edit Download recursive recursive
__init__.py	2.15 KB	lrw-r--r--	2021-11-09 20:25:25	Edit Download recursive recursive

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