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import os
import pytest
import _ast3
# Lowest and highest supported Python 3 minor version (inclusive)
MIN_VER = 4
MAX_VER = 7
NEXT_VER = MAX_VER + 1
basics = """\
def foo():
# type: () -> int
pass
def bar(): # type: () -> None
pass
"""
def test_basics():
for version in range(MIN_VER, NEXT_VER):
tree = _ast3._parse(basics, "<basics>", "exec", version)
assert tree.body[0].type_comment == "() -> int"
assert tree.body[1].type_comment == "() -> None"
vardecl = """\
a = 0 # type: int
a # type: int
"""
def test_vardecl():
for version in range(MIN_VER, NEXT_VER):
tree = _ast3._parse(vardecl, "<vardecl>", "exec", version)
assert tree.body[0].type_comment == "int"
# Curious fact: an expression can have a type comment
# but it is lost in the AST.
forstmt = """\
for a in []: # type: int
pass
"""
def test_forstmt():
for version in range(MIN_VER, NEXT_VER):
tree = _ast3._parse(forstmt, "<forstmt>", "exec", version)
assert tree.body[0].type_comment == "int"
withstmt = """\
with context(): # type: int
pass
"""
def test_withstmt():
for version in range(MIN_VER, NEXT_VER):
tree = _ast3._parse(withstmt, "<withstmt>", "exec", version)
assert tree.body[0].type_comment == "int"
# A test function named 'fabvk' would have two positional args, a and b,
# plus a var-arg *v, plus a kw-arg **k. It is verified in test_longargs()
# that it has exactly these arguments, no more, no fewer.
longargs = """\
def fa(
a = 1, # type: A
):
pass
def fa(
a = 1 # type: A
):
pass
def fab(
a, # type: A
b, # type: B
):
pass
def fab(
a, # type: A
b # type: B
):
pass
def fv(
*v, # type: V
):
pass
def fv(
*v # type: V
):
pass
def fk(
**k, # type: K
):
pass
def fk(
**k # type: K
):
pass
def fvk(
*v, # type: V
**k, # type: K
):
pass
def fvk(
*v, # type: V
**k # type: K
):
pass
def fav(
a, # type: A
*v, # type: V
):
pass
def fav(
a, # type: A
*v # type: V
):
pass
def fak(
a, # type: A
**k, # type: K
):
pass
def fak(
a, # type: A
**k # type: K
):
pass
def favk(
a, # type: A
*v, # type: V
**k, # type: K
):
pass
def favk(
a, # type: A
*v, # type: V
**k # type: K
):
pass
"""
def test_longargs():
for version in range(MIN_VER, NEXT_VER):
tree = _ast3._parse(longargs, "<longargs>", "exec", version)
for t in tree.body:
# The expected args are encoded in the function name
todo = set(t.name[1:])
assert len(t.args.args) == len(todo) - bool(t.args.vararg) - bool(t.args.kwarg)
assert t.name.startswith('f')
for c in t.name[1:]:
todo.remove(c)
if c == 'v':
arg = t.args.vararg
elif c == 'k':
arg = t.args.kwarg
else:
assert 0 <= ord(c) - ord('a') < len(t.args.args)
arg = t.args.args[ord(c) - ord('a')]
assert arg.arg == c # That's the argument name
assert arg.type_comment == arg.arg.upper()
assert not todo
ignores = """\
def foo():
pass # type: ignore
def bar():
x = 1 # type: ignore
"""
def test_ignores():
for version in range(MIN_VER, NEXT_VER):
tree = _ast3._parse(ignores, "<ignores>", "exec", version)
assert [ti.lineno for ti in tree.type_ignores] == [2, 5]
# TODO: type comment on new line (currently fails)
asyncfunc = """\
async def foo(): # type: () -> int
return await bar()
"""
def test_asyncfunc():
for version in range(3, 5):
with pytest.raises(SyntaxError):
_ast3._parse(asyncfunc, "<asyncfunc>", "exec", version)
for version in range(5, NEXT_VER):
tree = _ast3._parse(asyncfunc, "<asyncfunc>", "exec", version)
assert tree.body[0].type_comment == "() -> int"
asyncvar = """\
async = 12
await = 13
"""
def test_asyncvar():
for version in range(3, 7):
tree = _ast3._parse(asyncvar, "<asyncvar>", "exec", version)
for version in range(7, NEXT_VER):
with pytest.raises(SyntaxError):
_ast3._parse(asyncvar, "<asyncvar>", "exec", version)
asynccomp = """\
async def foo(xs):
[x async for x in xs]
"""
def test_asynccomp():
for version in range(3, 6):
with pytest.raises(SyntaxError):
tree = _ast3._parse(asynccomp, "<asynccomp>", "exec", version)
for version in range(6, NEXT_VER):
_ast3._parse(asynccomp, "<asynccomp>", "exec", version)
matmul = """\
a = b @ c
"""
def test_matmul():
for version in range(3, 5):
with pytest.raises(SyntaxError):
tree = _ast3._parse(matmul, "<matmul>", "exec", version)
for version in range(5, NEXT_VER):
tree = _ast3._parse(matmul, "<matmul>", "exec", version)
strkind = """\
plain = 'abc'
raw = r'abc'
"""
def test_strkind():
# Test that Str() objects have a kind argument/attribute.
node = _ast3.Str("foo", "r")
assert node.s == "foo"
assert node.kind == "r"
for version in range(MIN_VER, NEXT_VER):
tree = _ast3._parse(strkind, "<strkind>", "exec", version)
assert tree.body[0].value.kind == ""
assert tree.body[1].value.kind == "r"
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