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# copyright 2003-2015 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This file is part of astroid.
#
# astroid is free software: you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by the
# Free Software Foundation, either version 2.1 of the License, or (at your
# option) any later version.
#
# astroid is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
# for more details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with astroid. If not, see <http://www.gnu.org/licenses/>.
"""Tests for the astroid AST peephole optimizer."""
import ast
import textwrap
import unittest
import astroid
from astroid import astpeephole
from astroid import builder
from astroid import manager
from astroid import test_utils
from astroid.tests import resources
MANAGER = manager.AstroidManager()
class PeepholeOptimizer(unittest.TestCase):
@classmethod
def setUpClass(cls):
MANAGER.optimize_ast = True
@classmethod
def tearDownClass(cls):
MANAGER.optimize_ast = False
def setUp(self):
self._optimizer = astpeephole.ASTPeepholeOptimizer()
@staticmethod
def _get_binops(code):
module = ast.parse(textwrap.dedent(code))
return [node.value for node in module.body
if isinstance(node, ast.Expr)]
@test_utils.require_version(maxver='3.0')
def test_optimize_binop_unicode(self):
nodes = self._get_binops("""
u"a" + u"b" + u"c"
u"a" + "c" + "b"
u"a" + b"c"
""")
result = self._optimizer.optimize_binop(nodes[0])
self.assertIsInstance(result, astroid.Const)
self.assertEqual(result.value, u"abc")
self.assertIsNone(self._optimizer.optimize_binop(nodes[1]))
self.assertIsNone(self._optimizer.optimize_binop(nodes[2]))
def test_optimize_binop(self):
nodes = self._get_binops("""
"a" + "b" + "c" + "d"
b"a" + b"b" + b"c" + b"d"
"a" + "b"
"a" + "b" + 1 + object
var = 4
"a" + "b" + var + "c"
"a" + "b" + "c" - "4"
"a" + "b" + "c" + "d".format()
"a" - "b"
"a"
1 + 4 + 5 + 6
""")
result = self._optimizer.optimize_binop(nodes[0])
self.assertIsInstance(result, astroid.Const)
self.assertEqual(result.value, "abcd")
result = self._optimizer.optimize_binop(nodes[1])
self.assertIsInstance(result, astroid.Const)
self.assertEqual(result.value, b"abcd")
for node in nodes[2:]:
self.assertIsNone(self._optimizer.optimize_binop(node))
def test_big_binop_crash(self):
# Test that we don't fail on a lot of joined strings
# through the addition operator.
module = resources.build_file('data/joined_strings.py')
element = next(module['x'].infer())
self.assertIsInstance(element, astroid.Const)
self.assertEqual(len(element.value), 61660)
def test_optimisation_disabled(self):
try:
MANAGER.optimize_ast = False
module = builder.parse("""
'1' + '2' + '3'
""")
self.assertIsInstance(module.body[0], astroid.Expr)
self.assertIsInstance(module.body[0].value, astroid.BinOp)
self.assertIsInstance(module.body[0].value.left, astroid.BinOp)
self.assertIsInstance(module.body[0].value.left.left,
astroid.Const)
finally:
MANAGER.optimize_ast = True
if __name__ == '__main__':
unittest.main()
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