lib-python.2.7.test.test_parser.py Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of jython Show documentation
Show all versions of jython Show documentation
Jython is an implementation of the high-level, dynamic, object-oriented
language Python written in 100% Pure Java, and seamlessly integrated with
the Java platform. It thus allows you to run Python on any Java platform.
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), "")
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()