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# mode: run
# tag: syntax
"""
Uses TreeFragment to test invalid syntax.
"""
from __future__ import absolute_import
import ast
import textwrap
from ...TestUtils import CythonTest
from .. import ExprNodes
from ..Errors import CompileError
# Copied from CPython's test_grammar.py
VALID_UNDERSCORE_LITERALS = [
'0_0_0',
'4_2',
'1_0000_0000',
'0b1001_0100',
'0xffff_ffff',
'0o5_7_7',
'1_00_00.5',
'1_00_00.5j',
'1_00_00.5e5',
'1_00_00j',
'1_00_00e5_1',
'1e1_0',
'.1_4',
'.1_4e1',
'0b_0',
'0x_f',
'0o_5',
'1_00_00j',
'1_00_00.5j',
'1_00_00e5_1j',
'.1_4j',
'(1_2.5+3_3j)',
'(.5_6j)',
]
# Copied from CPython's test_grammar.py
INVALID_UNDERSCORE_LITERALS = [
# Trailing underscores:
'0_',
'42_',
'1.4j_',
'0x_',
'0b1_',
'0xf_',
'0o5_',
'0 if 1_Else 1',
# Underscores in the base selector:
'0_b0',
'0_xf',
'0_o5',
# Old-style octal, still disallowed:
# FIXME: still need to support PY_VERSION_HEX < 3
'0_7',
'09_99',
# Multiple consecutive underscores:
'4_______2',
'0.1__4',
'0.1__4j',
'0b1001__0100',
'0xffff__ffff',
'0x___',
'0o5__77',
'1e1__0',
'1e1__0j',
# Underscore right before a dot:
'1_.4',
'1_.4j',
# Underscore right after a dot:
'1._4',
'1._4j',
'._5',
'._5j',
# Underscore right after a sign:
'1.0e+_1',
'1.0e+_1j',
# Underscore right before j:
'1.4_j',
'1.4e5_j',
# Underscore right before e:
'1_e1',
'1.4_e1',
'1.4_e1j',
# Underscore right after e:
'1e_1',
'1.4e_1',
'1.4e_1j',
# Complex cases with parens:
'(1+1.5_j_)',
'(1+1.5_j)',
# Whitespace in literals
'1_ 2',
'1 _2',
'1_2.2_ 1',
'1_2.2 _1',
'1_2e _1',
'1_2e2 _1',
'1_2e 2_1',
]
INVALID_ELLIPSIS = [
(". . .", 2, 0),
(". ..", 2, 0),
(".. .", 2, 0),
(". ...", 2, 0),
(". ... .", 2, 0),
(".. ... .", 2, 0),
(". ... ..", 2, 0),
("""
(
.
..
)
""", 3, 4),
("""
[
..
.,
None
]
""", 3, 4),
("""
{
None,
.
.
.
}
""", 4, 4)
]
class TestGrammar(CythonTest):
def test_invalid_number_literals(self):
for literal in INVALID_UNDERSCORE_LITERALS:
for expression in ['%s', '1 + %s', '%s + 1', '2 * %s', '%s * 2']:
code = 'x = ' + expression % literal
try:
self.fragment(u'''\
# cython: language_level=3
''' + code)
except CompileError as exc:
assert code in [s.strip() for s in str(exc).splitlines()], str(exc)
else:
assert False, "Invalid Cython code '%s' failed to raise an exception" % code
def test_valid_number_literals(self):
for literal in VALID_UNDERSCORE_LITERALS:
for i, expression in enumerate(['%s', '1 + %s', '%s + 1', '2 * %s', '%s * 2']):
code = 'x = ' + expression % literal
node = self.fragment(u'''\
# cython: language_level=3
''' + code).root
assert node is not None
literal_node = node.stats[0].rhs # StatListNode([SingleAssignmentNode('x', expr)])
if i > 0:
# Add/MulNode() -> literal is first or second operand
literal_node = literal_node.operand2 if i % 2 else literal_node.operand1
if 'j' in literal or 'J' in literal:
if '+' in literal:
# FIXME: tighten this test
assert isinstance(literal_node, ExprNodes.AddNode), (literal, literal_node)
else:
assert isinstance(literal_node, ExprNodes.ImagNode), (literal, literal_node)
elif '.' in literal or 'e' in literal or 'E' in literal and not ('0x' in literal or '0X' in literal):
assert isinstance(literal_node, ExprNodes.FloatNode), (literal, literal_node)
else:
assert isinstance(literal_node, ExprNodes.IntNode), (literal, literal_node)
def test_invalid_ellipsis(self):
ERR = ":{0}:{1}: Expected an identifier or literal"
for code, line, col in INVALID_ELLIPSIS:
try:
ast.parse(textwrap.dedent(code))
except SyntaxError as exc:
assert True
else:
assert False, "Invalid Python code '%s' failed to raise an exception" % code
try:
self.fragment(u'''\
# cython: language_level=3
''' + code)
except CompileError as exc:
assert ERR.format(line, col) in str(exc), str(exc)
else:
assert False, "Invalid Cython code '%s' failed to raise an exception" % code
if __name__ == "__main__":
import unittest
unittest.main()
|
