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354433a59d
(Code contributed by Jiwon Seo.) The documentation portion of the patch is being re-worked and will be checked-in soon. Likewise, PEP 289 will be updated to reflect Guido's rationale for the design decisions on binding behavior (as described in in his patch comments and in discussions on python-dev). The test file, test_genexps.py, is written in doctest format and is meant to exercise all aspects of the the patch. Further additions are welcome from everyone. Please stress test this new feature as much as possible before the alpha release.
386 lines
12 KiB
Python
386 lines
12 KiB
Python
import parser
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import unittest
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from test import test_support
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#
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# First, we test that we can generate trees from valid source fragments,
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# and that these valid trees are indeed allowed by the tree-loading side
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# of the parser module.
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#
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class RoundtripLegalSyntaxTestCase(unittest.TestCase):
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def roundtrip(self, f, s):
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st1 = f(s)
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t = st1.totuple()
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try:
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st2 = parser.sequence2st(t)
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except parser.ParserError:
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self.fail("could not roundtrip %r" % s)
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self.assertEquals(t, st2.totuple(),
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"could not re-generate syntax tree")
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def check_expr(self, s):
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self.roundtrip(parser.expr, s)
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def check_suite(self, s):
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self.roundtrip(parser.suite, s)
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def test_yield_statement(self):
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self.check_suite("def f(): yield 1")
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self.check_suite("def f(): return; yield 1")
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self.check_suite("def f(): yield 1; return")
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self.check_suite("def f():\n"
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" for x in range(30):\n"
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" yield x\n")
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def test_expressions(self):
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self.check_expr("foo(1)")
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self.check_expr("[1, 2, 3]")
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self.check_expr("[x**3 for x in range(20)]")
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self.check_expr("[x**3 for x in range(20) if x % 3]")
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self.check_expr("foo(*args)")
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self.check_expr("foo(*args, **kw)")
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self.check_expr("foo(**kw)")
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self.check_expr("foo(key=value)")
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self.check_expr("foo(key=value, *args)")
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self.check_expr("foo(key=value, *args, **kw)")
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self.check_expr("foo(key=value, **kw)")
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self.check_expr("foo(a, b, c, *args)")
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self.check_expr("foo(a, b, c, *args, **kw)")
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self.check_expr("foo(a, b, c, **kw)")
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self.check_expr("foo + bar")
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self.check_expr("foo - bar")
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self.check_expr("foo * bar")
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self.check_expr("foo / bar")
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self.check_expr("foo // bar")
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self.check_expr("lambda: 0")
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self.check_expr("lambda x: 0")
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self.check_expr("lambda *y: 0")
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self.check_expr("lambda *y, **z: 0")
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self.check_expr("lambda **z: 0")
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self.check_expr("lambda x, y: 0")
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self.check_expr("lambda foo=bar: 0")
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self.check_expr("lambda foo=bar, spaz=nifty+spit: 0")
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self.check_expr("lambda foo=bar, **z: 0")
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self.check_expr("lambda foo=bar, blaz=blat+2, **z: 0")
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self.check_expr("lambda foo=bar, blaz=blat+2, *y, **z: 0")
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self.check_expr("lambda x, *y, **z: 0")
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self.check_expr("(x for x in range(10))")
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self.check_expr("foo(x for x in range(10))")
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def test_print(self):
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self.check_suite("print")
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self.check_suite("print 1")
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self.check_suite("print 1,")
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self.check_suite("print >>fp")
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self.check_suite("print >>fp, 1")
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self.check_suite("print >>fp, 1,")
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def test_simple_expression(self):
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# expr_stmt
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self.check_suite("a")
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def test_simple_assignments(self):
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self.check_suite("a = b")
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self.check_suite("a = b = c = d = e")
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def test_simple_augmented_assignments(self):
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self.check_suite("a += b")
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self.check_suite("a -= b")
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self.check_suite("a *= b")
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self.check_suite("a /= b")
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self.check_suite("a //= b")
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self.check_suite("a %= b")
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self.check_suite("a &= b")
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self.check_suite("a |= b")
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self.check_suite("a ^= b")
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self.check_suite("a <<= b")
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self.check_suite("a >>= b")
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self.check_suite("a **= b")
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def test_function_defs(self):
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self.check_suite("def f(): pass")
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self.check_suite("def f(*args): pass")
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self.check_suite("def f(*args, **kw): pass")
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self.check_suite("def f(**kw): pass")
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self.check_suite("def f(foo=bar): pass")
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self.check_suite("def f(foo=bar, *args): pass")
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self.check_suite("def f(foo=bar, *args, **kw): pass")
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self.check_suite("def f(foo=bar, **kw): pass")
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self.check_suite("def f(a, b): pass")
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self.check_suite("def f(a, b, *args): pass")
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self.check_suite("def f(a, b, *args, **kw): pass")
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self.check_suite("def f(a, b, **kw): pass")
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self.check_suite("def f(a, b, foo=bar): pass")
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self.check_suite("def f(a, b, foo=bar, *args): pass")
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self.check_suite("def f(a, b, foo=bar, *args, **kw): pass")
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self.check_suite("def f(a, b, foo=bar, **kw): pass")
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def test_import_from_statement(self):
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self.check_suite("from sys.path import *")
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self.check_suite("from sys.path import dirname")
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self.check_suite("from sys.path import dirname as my_dirname")
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self.check_suite("from sys.path import dirname, basename")
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self.check_suite(
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"from sys.path import dirname as my_dirname, basename")
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self.check_suite(
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"from sys.path import dirname, basename as my_basename")
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def test_basic_import_statement(self):
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self.check_suite("import sys")
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self.check_suite("import sys as system")
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self.check_suite("import sys, math")
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self.check_suite("import sys as system, math")
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self.check_suite("import sys, math as my_math")
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def test_pep263(self):
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self.check_suite("# -*- coding: iso-8859-1 -*-\n"
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"pass\n")
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def test_assert(self):
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self.check_suite("assert alo < ahi and blo < bhi\n")
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#
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# Second, we take *invalid* trees and make sure we get ParserError
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# rejections for them.
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#
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class IllegalSyntaxTestCase(unittest.TestCase):
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def check_bad_tree(self, tree, label):
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try:
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parser.sequence2st(tree)
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except parser.ParserError:
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pass
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else:
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self.fail("did not detect invalid tree for %r" % label)
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def test_junk(self):
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# not even remotely valid:
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self.check_bad_tree((1, 2, 3), "<junk>")
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def test_illegal_yield_1(self):
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# Illegal yield statement: def f(): return 1; yield 1
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tree = \
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(257,
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(264,
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(285,
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(259,
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(1, 'def'),
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(1, 'f'),
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(260, (7, '('), (8, ')')),
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(11, ':'),
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(291,
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(4, ''),
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(5, ''),
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(264,
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(265,
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(266,
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(272,
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(275,
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(1, 'return'),
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(313,
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(292,
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(293,
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(294,
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(295,
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(297,
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(298,
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(299,
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(300,
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(301,
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(302, (303, (304, (305, (2, '1')))))))))))))))))),
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(264,
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(265,
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(266,
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(272,
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(276,
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(1, 'yield'),
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(313,
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(292,
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(293,
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(294,
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(295,
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(297,
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(298,
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(299,
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(300,
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(301,
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(302,
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(303, (304, (305, (2, '1')))))))))))))))))),
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(4, ''))),
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(6, ''))))),
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(4, ''),
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(0, ''))))
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self.check_bad_tree(tree, "def f():\n return 1\n yield 1")
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def test_illegal_yield_2(self):
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# Illegal return in generator: def f(): return 1; yield 1
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tree = \
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(257,
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(264,
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(265,
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(266,
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(278,
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(1, 'from'),
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(281, (1, '__future__')),
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(1, 'import'),
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(279, (1, 'generators')))),
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(4, ''))),
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(264,
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(285,
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(259,
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(1, 'def'),
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(1, 'f'),
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(260, (7, '('), (8, ')')),
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(11, ':'),
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(291,
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(4, ''),
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(5, ''),
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(264,
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(265,
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(266,
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(272,
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(275,
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(1, 'return'),
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(313,
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(292,
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(293,
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(294,
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(295,
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(297,
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(298,
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(299,
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(300,
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(301,
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(302, (303, (304, (305, (2, '1')))))))))))))))))),
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(264,
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(265,
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(266,
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(272,
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(276,
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(1, 'yield'),
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(313,
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(292,
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(293,
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(294,
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(295,
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(297,
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(298,
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(299,
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(300,
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(301,
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(302,
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(303, (304, (305, (2, '1')))))))))))))))))),
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(4, ''))),
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(6, ''))))),
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(4, ''),
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(0, ''))))
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self.check_bad_tree(tree, "def f():\n return 1\n yield 1")
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def test_print_chevron_comma(self):
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# Illegal input: print >>fp,
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tree = \
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(257,
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(264,
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(265,
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(266,
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(268,
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(1, 'print'),
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(35, '>>'),
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(290,
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(291,
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(292,
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(293,
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(295,
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(296,
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(297,
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(298, (299, (300, (301, (302, (303, (1, 'fp')))))))))))))),
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(12, ','))),
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(4, ''))),
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(0, ''))
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self.check_bad_tree(tree, "print >>fp,")
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def test_a_comma_comma_c(self):
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# Illegal input: a,,c
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tree = \
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(258,
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(311,
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(290,
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(291,
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(292,
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(293,
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(295,
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(296,
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(297,
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(298, (299, (300, (301, (302, (303, (1, 'a')))))))))))))),
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(12, ','),
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(12, ','),
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(290,
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(291,
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(292,
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(293,
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(295,
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(296,
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(297,
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(298, (299, (300, (301, (302, (303, (1, 'c'))))))))))))))),
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(4, ''),
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(0, ''))
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self.check_bad_tree(tree, "a,,c")
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def test_illegal_operator(self):
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# Illegal input: a $= b
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tree = \
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(257,
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(264,
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(265,
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(266,
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(267,
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(312,
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(291,
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(292,
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(293,
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(294,
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(296,
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(297,
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(298,
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(299,
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(300, (301, (302, (303, (304, (1, 'a'))))))))))))))),
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(268, (37, '$=')),
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(312,
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(291,
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(292,
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(293,
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(294,
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(296,
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(297,
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(298,
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(299,
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(300, (301, (302, (303, (304, (1, 'b'))))))))))))))))),
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(4, ''))),
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(0, ''))
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self.check_bad_tree(tree, "a $= b")
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def test_malformed_global(self):
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#doesn't have global keyword in ast
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tree = (257,
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(264,
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(265,
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(266,
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(282, (1, 'foo'))), (4, ''))),
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(4, ''),
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(0, ''))
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self.check_bad_tree(tree, "malformed global ast")
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def test_main():
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test_support.run_unittest(
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RoundtripLegalSyntaxTestCase,
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IllegalSyntaxTestCase
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)
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if __name__ == "__main__":
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test_main()
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