cpython/Lib/lib2to3/tests/test_parser.py

250 lines
7.0 KiB
Python

"""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