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