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"""Test suite for 2to3's parser and grammar files.
This is the place to add tests for changes to 2to3's grammar, such as those
merging the grammars for Python 2 and 3. In addition to specific tests for
parts of the grammar we've changed, we also make sure we can parse the
test_grammar.py files from both Python 2 and Python 3.
"""
from __future__ import with_statement
# Testing imports
from . import support
from .support import driver, test_dir
from test.support import verbose
# Python imports
import os
import sys
import unittest
import warnings
import subprocess
# Local imports
from lib2to3.pgen2 import tokenize
from ..pgen2.parse import ParseError
from lib2to3.pygram import python_symbols as syms
class TestDriver(support.TestCase):
def test_formfeed(self):
s = """print 1\n\x0Cprint 2\n"""
t = driver.parse_string(s)
self.assertEqual(t.children[0].children[0].type, syms.print_stmt)
self.assertEqual(t.children[1].children[0].type, syms.print_stmt)
class GrammarTest(support.TestCase):
def validate(self, code):
support.parse_string(code)
def invalid_syntax(self, code):
try:
self.validate(code)
except ParseError:
pass
else:
raise AssertionError("Syntax shouldn't have been valid")
class TestMatrixMultiplication(GrammarTest):
def test_matrix_multiplication_operator(self):
self.validate("a @ b")
self.validate("a @= b")
class TestYieldFrom(GrammarTest):
def test_matrix_multiplication_operator(self):
self.validate("yield from x")
self.validate("(yield from x) + y")
self.invalid_syntax("yield from")
class TestRaiseChanges(GrammarTest):
def test_2x_style_1(self):
self.validate("raise")
def test_2x_style_2(self):
self.validate("raise E, V")
def test_2x_style_3(self):
self.validate("raise E, V, T")
def test_2x_style_invalid_1(self):
self.invalid_syntax("raise E, V, T, Z")
def test_3x_style(self):
self.validate("raise E1 from E2")
def test_3x_style_invalid_1(self):
self.invalid_syntax("raise E, V from E1")
def test_3x_style_invalid_2(self):
self.invalid_syntax("raise E from E1, E2")
def test_3x_style_invalid_3(self):
self.invalid_syntax("raise from E1, E2")
def test_3x_style_invalid_4(self):
self.invalid_syntax("raise E from")
# Adapted from Python 3's Lib/test/test_grammar.py:GrammarTests.testFuncdef
class TestFunctionAnnotations(GrammarTest):
def test_1(self):
self.validate("""def f(x) -> list: pass""")
def test_2(self):
self.validate("""def f(x:int): pass""")
def test_3(self):
self.validate("""def f(*x:str): pass""")
def test_4(self):
self.validate("""def f(**x:float): pass""")
def test_5(self):
self.validate("""def f(x, y:1+2): pass""")
def test_6(self):
self.validate("""def f(a, (b:1, c:2, d)): pass""")
def test_7(self):
self.validate("""def f(a, (b:1, c:2, d), e:3=4, f=5, *g:6): pass""")
def test_8(self):
s = """def f(a, (b:1, c:2, d), e:3=4, f=5,
*g:6, h:7, i=8, j:9=10, **k:11) -> 12: pass"""
self.validate(s)
class TestExcept(GrammarTest):
def test_new(self):
s = """
try:
x
except E as N:
y"""
self.validate(s)
def test_old(self):
s = """
try:
x
except E, N:
y"""
self.validate(s)
# Adapted from Python 3's Lib/test/test_grammar.py:GrammarTests.testAtoms
class TestSetLiteral(GrammarTest):
def test_1(self):
self.validate("""x = {'one'}""")
def test_2(self):
self.validate("""x = {'one', 1,}""")
def test_3(self):
self.validate("""x = {'one', 'two', 'three'}""")
def test_4(self):
self.validate("""x = {2, 3, 4,}""")
class TestNumericLiterals(GrammarTest):
def test_new_octal_notation(self):
self.validate("""0o7777777777777""")
self.invalid_syntax("""0o7324528887""")
def test_new_binary_notation(self):
self.validate("""0b101010""")
self.invalid_syntax("""0b0101021""")
class TestClassDef(GrammarTest):
def test_new_syntax(self):
self.validate("class B(t=7): pass")
self.validate("class B(t, *args): pass")
self.validate("class B(t, **kwargs): pass")
self.validate("class B(t, *args, **kwargs): pass")
self.validate("class B(t, y=9, *args, **kwargs): pass")
class TestParserIdempotency(support.TestCase):
"""A cut-down version of pytree_idempotency.py."""
# Issue 13125
@unittest.expectedFailure
def test_all_project_files(self):
for filepath in support.all_project_files():
with open(filepath, "rb") as fp:
encoding = tokenize.detect_encoding(fp.readline)[0]
self.assertIsNotNone(encoding,
"can't detect encoding for %s" % filepath)
with open(filepath, "r", encoding=encoding) as fp:
source = fp.read()
try:
tree = driver.parse_string(source)
except ParseError as err:
if verbose > 0:
warnings.warn('ParseError on file %s (%s)' % (filepath, err))
continue
new = str(tree)
x = diff(filepath, new)
if x:
self.fail("Idempotency failed: %s" % filepath)
def test_extended_unpacking(self):
driver.parse_string("a, *b, c = x\n")
driver.parse_string("[*a, b] = x\n")
driver.parse_string("(z, *y, w) = m\n")
driver.parse_string("for *z, m in d: pass\n")
class TestLiterals(GrammarTest):
def validate(self, s):
driver.parse_string(support.dedent(s) + "\n\n")
def test_multiline_bytes_literals(self):
s = """
md5test(b"\xaa" * 80,
(b"Test Using Larger Than Block-Size Key "
b"and Larger Than One Block-Size Data"),
"6f630fad67cda0ee1fb1f562db3aa53e")
"""
self.validate(s)
def test_multiline_bytes_tripquote_literals(self):
s = '''
b"""
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN">
"""
'''
self.validate(s)
def test_multiline_str_literals(self):
s = """
md5test("\xaa" * 80,
("Test Using Larger Than Block-Size Key "
"and Larger Than One Block-Size Data"),
"6f630fad67cda0ee1fb1f562db3aa53e")
"""
self.validate(s)
def diff(fn, result):
try:
with open('@', 'w') as f:
f.write(str(result))
fn = fn.replace('"', '\\"')
return subprocess.call(['diff', '-u', fn, '@'], stdout=(subprocess.DEVNULL if verbose < 1 else None))
finally:
try:
os.remove("@")
except OSError:
pass
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