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cpython/Lib/test/test_parser.py

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import parser
import unittest
import sys
from test import test_support
#
# First, we test that we can generate trees from valid source fragments,
# and that these valid trees are indeed allowed by the tree-loading side
# of the parser module.
#
class RoundtripLegalSyntaxTestCase(unittest.TestCase):
def roundtrip(self, f, s):
st1 = f(s)
t = st1.totuple()
try:
st2 = parser.sequence2st(t)
except parser.ParserError, why:
self.fail("could not roundtrip %r: %s" % (s, why))
self.assertEqual(t, st2.totuple(),
"could not re-generate syntax tree")
def check_expr(self, s):
self.roundtrip(parser.expr, s)
def test_flags_passed(self):
# The unicode literals flags has to be passed from the paser to AST
# generation.
suite = parser.suite("from __future__ import unicode_literals; x = ''")
code = suite.compile()
scope = {}
exec code in scope
self.assertIsInstance(scope["x"], unicode)
def check_suite(self, s):
self.roundtrip(parser.suite, s)
def test_yield_statement(self):
self.check_suite("def f(): yield 1")
self.check_suite("def f(): yield")
self.check_suite("def f(): x += yield")
self.check_suite("def f(): x = yield 1")
self.check_suite("def f(): x = y = yield 1")
self.check_suite("def f(): x = yield")
self.check_suite("def f(): x = y = yield")
self.check_suite("def f(): 1 + (yield)*2")
self.check_suite("def f(): (yield 1)*2")
self.check_suite("def f(): return; yield 1")
self.check_suite("def f(): yield 1; return")
self.check_suite("def f():\n"
" for x in range(30):\n"
" yield x\n")
self.check_suite("def f():\n"
" if (yield):\n"
" yield x\n")
def test_expressions(self):
self.check_expr("foo(1)")
self.check_expr("{1:1}")
self.check_expr("{1:1, 2:2, 3:3}")
self.check_expr("{1:1, 2:2, 3:3,}")
self.check_expr("{1}")
self.check_expr("{1, 2, 3}")
self.check_expr("{1, 2, 3,}")
self.check_expr("[]")
self.check_expr("[1]")
self.check_expr("[1, 2, 3]")
self.check_expr("[1, 2, 3,]")
self.check_expr("()")
self.check_expr("(1,)")
self.check_expr("(1, 2, 3)")
self.check_expr("(1, 2, 3,)")
self.check_expr("[x**3 for x in range(20)]")
self.check_expr("[x**3 for x in range(20) if x % 3]")
self.check_expr("[x**3 for x in range(20) if x % 2 if x % 3]")
self.check_expr("[x+y for x in range(30) for y in range(20) if x % 2 if y % 3]")
#self.check_expr("[x for x in lambda: True, lambda: False if x()]")
self.check_expr("list(x**3 for x in range(20))")
self.check_expr("list(x**3 for x in range(20) if x % 3)")
self.check_expr("list(x**3 for x in range(20) if x % 2 if x % 3)")
self.check_expr("list(x+y for x in range(30) for y in range(20) if x % 2 if y % 3)")
self.check_expr("{x**3 for x in range(30)}")
self.check_expr("{x**3 for x in range(30) if x % 3}")
self.check_expr("{x**3 for x in range(30) if x % 2 if x % 3}")
self.check_expr("{x+y for x in range(30) for y in range(20) if x % 2 if y % 3}")
self.check_expr("{x**3: y**2 for x, y in zip(range(30), range(30))}")
self.check_expr("{x**3: y**2 for x, y in zip(range(30), range(30)) if x % 3}")
self.check_expr("{x**3: y**2 for x, y in zip(range(30), range(30)) if x % 3 if y % 3}")
self.check_expr("{x:y for x in range(30) for y in range(20) if x % 2 if y % 3}")
self.check_expr("foo(*args)")
self.check_expr("foo(*args, **kw)")
self.check_expr("foo(**kw)")
self.check_expr("foo(key=value)")
self.check_expr("foo(key=value, *args)")
self.check_expr("foo(key=value, *args, **kw)")
self.check_expr("foo(key=value, **kw)")
self.check_expr("foo(a, b, c, *args)")
self.check_expr("foo(a, b, c, *args, **kw)")
self.check_expr("foo(a, b, c, **kw)")
self.check_expr("foo(a, *args, keyword=23)")
self.check_expr("foo + bar")
self.check_expr("foo - bar")
self.check_expr("foo * bar")
self.check_expr("foo / bar")
self.check_expr("foo // bar")
self.check_expr("lambda: 0")
self.check_expr("lambda x: 0")
self.check_expr("lambda *y: 0")
self.check_expr("lambda *y, **z: 0")
self.check_expr("lambda **z: 0")
self.check_expr("lambda x, y: 0")
self.check_expr("lambda foo=bar: 0")
self.check_expr("lambda foo=bar, spaz=nifty+spit: 0")
self.check_expr("lambda foo=bar, **z: 0")
self.check_expr("lambda foo=bar, blaz=blat+2, **z: 0")
self.check_expr("lambda foo=bar, blaz=blat+2, *y, **z: 0")
self.check_expr("lambda x, *y, **z: 0")
self.check_expr("lambda x: 5 if x else 2")
self.check_expr("(x for x in range(10))")
self.check_expr("foo(x for x in range(10))")
def test_print(self):
self.check_suite("print")
self.check_suite("print 1")
self.check_suite("print 1,")
self.check_suite("print >>fp")
self.check_suite("print >>fp, 1")
self.check_suite("print >>fp, 1,")
def test_simple_expression(self):
# expr_stmt
self.check_suite("a")
def test_simple_assignments(self):
self.check_suite("a = b")
self.check_suite("a = b = c = d = e")
def test_simple_augmented_assignments(self):
self.check_suite("a += b")
self.check_suite("a -= b")
self.check_suite("a *= b")
self.check_suite("a /= b")
self.check_suite("a //= b")
self.check_suite("a %= b")
self.check_suite("a &= b")
self.check_suite("a |= b")
self.check_suite("a ^= b")
self.check_suite("a <<= b")
self.check_suite("a >>= b")
self.check_suite("a **= b")
def test_function_defs(self):
self.check_suite("def f(): pass")
self.check_suite("def f(*args): pass")
self.check_suite("def f(*args, **kw): pass")
self.check_suite("def f(**kw): pass")
self.check_suite("def f(foo=bar): pass")
self.check_suite("def f(foo=bar, *args): pass")
self.check_suite("def f(foo=bar, *args, **kw): pass")
self.check_suite("def f(foo=bar, **kw): pass")
self.check_suite("def f(a, b): pass")
self.check_suite("def f(a, b, *args): pass")
self.check_suite("def f(a, b, *args, **kw): pass")
self.check_suite("def f(a, b, **kw): pass")
self.check_suite("def f(a, b, foo=bar): pass")
self.check_suite("def f(a, b, foo=bar, *args): pass")
self.check_suite("def f(a, b, foo=bar, *args, **kw): pass")
self.check_suite("def f(a, b, foo=bar, **kw): pass")
self.check_suite("@staticmethod\n"
"def f(): pass")
self.check_suite("@staticmethod\n"
"@funcattrs(x, y)\n"
"def f(): pass")
self.check_suite("@funcattrs()\n"
"def f(): pass")
def test_class_defs(self):
self.check_suite("class foo():pass")
self.check_suite("@class_decorator\n"
"class foo():pass")
self.check_suite("@class_decorator(arg)\n"
"class foo():pass")
self.check_suite("@decorator1\n"
"@decorator2\n"
"class foo():pass")
def test_import_from_statement(self):
self.check_suite("from sys.path import *")
self.check_suite("from sys.path import dirname")
self.check_suite("from sys.path import (dirname)")
self.check_suite("from sys.path import (dirname,)")
self.check_suite("from sys.path import dirname as my_dirname")
self.check_suite("from sys.path import (dirname as my_dirname)")
self.check_suite("from sys.path import (dirname as my_dirname,)")
self.check_suite("from sys.path import dirname, basename")
self.check_suite("from sys.path import (dirname, basename)")
self.check_suite("from sys.path import (dirname, basename,)")
self.check_suite(
"from sys.path import dirname as my_dirname, basename")
self.check_suite(
"from sys.path import (dirname as my_dirname, basename)")
self.check_suite(
"from sys.path import (dirname as my_dirname, basename,)")
self.check_suite(
"from sys.path import dirname, basename as my_basename")
self.check_suite(
"from sys.path import (dirname, basename as my_basename)")
self.check_suite(
"from sys.path import (dirname, basename as my_basename,)")
self.check_suite("from .bogus import x")
def test_basic_import_statement(self):
self.check_suite("import sys")
self.check_suite("import sys as system")
self.check_suite("import sys, math")
self.check_suite("import sys as system, math")
self.check_suite("import sys, math as my_math")
def test_relative_imports(self):
self.check_suite("from . import name")
self.check_suite("from .. import name")
self.check_suite("from .pkg import name")
self.check_suite("from ..pkg import name")
def test_pep263(self):
self.check_suite("# -*- coding: iso-8859-1 -*-\n"
"pass\n")
def test_assert(self):
self.check_suite("assert alo < ahi and blo < bhi\n")
def test_with(self):
self.check_suite("with open('x'): pass\n")
self.check_suite("with open('x') as f: pass\n")
self.check_suite("with open('x') as f, open('y') as g: pass\n")
def test_try_stmt(self):
self.check_suite("try: pass\nexcept: pass\n")
self.check_suite("try: pass\nfinally: pass\n")
self.check_suite("try: pass\nexcept A: pass\nfinally: pass\n")
self.check_suite("try: pass\nexcept A: pass\nexcept: pass\n"
"finally: pass\n")
self.check_suite("try: pass\nexcept: pass\nelse: pass\n")
self.check_suite("try: pass\nexcept: pass\nelse: pass\n"
"finally: pass\n")
def test_except_clause(self):
self.check_suite("try: pass\nexcept: pass\n")
self.check_suite("try: pass\nexcept A: pass\n")
self.check_suite("try: pass\nexcept A, e: pass\n")
self.check_suite("try: pass\nexcept A as e: pass\n")
def test_position(self):
# An absolutely minimal test of position information. Better
# tests would be a big project.
code = "def f(x):\n return x + 1"
st1 = parser.suite(code)
st2 = st1.totuple(line_info=1, col_info=1)
def walk(tree):
node_type = tree[0]
next = tree[1]
if isinstance(next, tuple):
for elt in tree[1:]:
for x in walk(elt):
yield x
else:
yield tree
terminals = list(walk(st2))
self.assertEqual([
(1, 'def', 1, 0),
(1, 'f', 1, 4),
(7, '(', 1, 5),
(1, 'x', 1, 6),
(8, ')', 1, 7),
(11, ':', 1, 8),
(4, '', 1, 9),
(5, '', 2, -1),
(1, 'return', 2, 4),
(1, 'x', 2, 11),
(14, '+', 2, 13),
(2, '1', 2, 15),
(4, '', 2, 16),
(6, '', 2, -1),
(4, '', 2, -1),
(0, '', 2, -1)],
terminals)
#
# Second, we take *invalid* trees and make sure we get ParserError
# rejections for them.
#
class IllegalSyntaxTestCase(unittest.TestCase):
def check_bad_tree(self, tree, label):
try:
parser.sequence2st(tree)
except parser.ParserError:
pass
else:
self.fail("did not detect invalid tree for %r" % label)
def test_junk(self):
# not even remotely valid:
self.check_bad_tree((1, 2, 3), "<junk>")
def test_illegal_yield_1(self):
# Illegal yield statement: def f(): return 1; yield 1
tree = \
(257,
(264,
(285,
(259,
(1, 'def'),
(1, 'f'),
(260, (7, '('), (8, ')')),
(11, ':'),
(291,
(4, ''),
(5, ''),
(264,
(265,
(266,
(272,
(275,
(1, 'return'),
(313,
(292,
(293,
(294,
(295,
(297,
(298,
(299,
(300,
(301,
(302, (303, (304, (305, (2, '1')))))))))))))))))),
(264,
(265,
(266,
(272,
(276,
(1, 'yield'),
(313,
(292,
(293,
(294,
(295,
(297,
(298,
(299,
(300,
(301,
(302,
(303, (304, (305, (2, '1')))))))))))))))))),
(4, ''))),
(6, ''))))),
(4, ''),
(0, ''))))
self.check_bad_tree(tree, "def f():\n return 1\n yield 1")
def test_illegal_yield_2(self):
# Illegal return in generator: def f(): return 1; yield 1
tree = \
(257,
(264,
(265,
(266,
(278,
(1, 'from'),
(281, (1, '__future__')),
(1, 'import'),
(279, (1, 'generators')))),
(4, ''))),
(264,
(285,
(259,
(1, 'def'),
(1, 'f'),
(260, (7, '('), (8, ')')),
(11, ':'),
(291,
(4, ''),
(5, ''),
(264,
(265,
(266,
(272,
(275,
(1, 'return'),
(313,
(292,
(293,
(294,
(295,
(297,
(298,
(299,
(300,
(301,
(302, (303, (304, (305, (2, '1')))))))))))))))))),
(264,
(265,
(266,
(272,
(276,
(1, 'yield'),
(313,
(292,
(293,
(294,
(295,
(297,
(298,
(299,
(300,
(301,
(302,
(303, (304, (305, (2, '1')))))))))))))))))),
(4, ''))),
(6, ''))))),
(4, ''),
(0, ''))))
self.check_bad_tree(tree, "def f():\n return 1\n yield 1")
def test_print_chevron_comma(self):
# Illegal input: print >>fp,
tree = \
(257,
(264,
(265,
(266,
(268,
(1, 'print'),
(35, '>>'),
(290,
(291,
(292,
(293,
(295,
(296,
(297,
(298, (299, (300, (301, (302, (303, (1, 'fp')))))))))))))),
(12, ','))),
(4, ''))),
(0, ''))
self.check_bad_tree(tree, "print >>fp,")
def test_a_comma_comma_c(self):
# Illegal input: a,,c
tree = \
(258,
(311,
(290,
(291,
(292,
(293,
(295,
(296,
(297,
(298, (299, (300, (301, (302, (303, (1, 'a')))))))))))))),
(12, ','),
(12, ','),
(290,
(291,
(292,
(293,
(295,
(296,
(297,
(298, (299, (300, (301, (302, (303, (1, 'c'))))))))))))))),
(4, ''),
(0, ''))
self.check_bad_tree(tree, "a,,c")
def test_illegal_operator(self):
# Illegal input: a $= b
tree = \
(257,
(264,
(265,
(266,
(267,
(312,
(291,
(292,
(293,
(294,
(296,
(297,
(298,
(299,
(300, (301, (302, (303, (304, (1, 'a'))))))))))))))),
(268, (37, '$=')),
(312,
(291,
(292,
(293,
(294,
(296,
(297,
(298,
(299,
(300, (301, (302, (303, (304, (1, 'b'))))))))))))))))),
(4, ''))),
(0, ''))
self.check_bad_tree(tree, "a $= b")
def test_malformed_global(self):
#doesn't have global keyword in ast
tree = (257,
(264,
(265,
(266,
(282, (1, 'foo'))), (4, ''))),
(4, ''),
(0, ''))
self.check_bad_tree(tree, "malformed global ast")
def test_missing_import_source(self):
# from import a
tree = \
(257,
(267,
(268,
(269,
(281,
(283, (1, 'from'), (1, 'import'),
(286, (284, (1, 'fred')))))),
(4, ''))),
(4, ''), (0, ''))
self.check_bad_tree(tree, "from import a")
class CompileTestCase(unittest.TestCase):
# These tests are very minimal. :-(
def test_compile_expr(self):
st = parser.expr('2 + 3')
code = parser.compilest(st)
self.assertEqual(eval(code), 5)
def test_compile_suite(self):
st = parser.suite('x = 2; y = x + 3')
code = parser.compilest(st)
globs = {}
exec code in globs
self.assertEqual(globs['y'], 5)
def test_compile_error(self):
st = parser.suite('1 = 3 + 4')
self.assertRaises(SyntaxError, parser.compilest, st)
def test_compile_badunicode(self):
st = parser.suite('a = u"\U12345678"')
self.assertRaises(SyntaxError, parser.compilest, st)
st = parser.suite('a = u"\u1"')
self.assertRaises(SyntaxError, parser.compilest, st)
class ParserStackLimitTestCase(unittest.TestCase):
"""try to push the parser to/over it's limits.
see http://bugs.python.org/issue1881 for a discussion
"""
def _nested_expression(self, level):
return "["*level+"]"*level
def test_deeply_nested_list(self):
e = self._nested_expression(99)
st = parser.expr(e)
st.compile()
def test_trigger_memory_error(self):
e = self._nested_expression(100)
print >>sys.stderr, "Expecting 's_push: parser stack overflow' in next line"
self.assertRaises(MemoryError, parser.expr, e)
def test_main():
test_support.run_unittest(
RoundtripLegalSyntaxTestCase,
IllegalSyntaxTestCase,
CompileTestCase,
ParserStackLimitTestCase,
)
if __name__ == "__main__":
test_main()
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