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#------------------------------------------------------------------------------
# Copyright (c) 2019-2024, Nucleic Development Team.
#
# Distributed under the terms of the Modified BSD License.
#
# The full license is in the file COPYING.txt, distributed with this software.
#------------------------------------------------------------------------------
import sys
from textwrap import dedent
import pytest
from enaml.core.alias import Alias
from utils import compile_source
SUBSCRIPTION_BLOCK_TESTS = {
# What should not work
'leftshift newline in func': (SyntaxError, """
enamldef Main(Window):
Container:
Label:
func test():
x = 1 <<
8
return str(x)
text = test()
"""),
'leftshfit newline in attr': (SyntaxError, """
enamldef Main(Window):
Container:
Label:
attr x = 1 <<
8
text = str(x)
"""),
'leftshift newline in if': (SyntaxError, """
enamldef Main(Window):
Container:
Label:
func test():
if 1 <<
8:
return 'this is bad'
text = str(test())
"""),
'yield in sub block': (SyntaxError, """
enamldef Main(Window):
Container:
Label:
text <<
for i in range(10):
yield i
"""),
# What should still work
'leftshift newline in parenthesis': (None, """
enamldef Main(Window):
Container:
Label:
text = str(1 <<
8)
"""),
'leftshift token in func': (None, """
enamldef Main(Window):
Container:
Label:
func test():
x = 1 << 8
return str(x)
text = test()
"""),
'leftshift token in attr': (None, """
enamldef Main(Window):
Container:
Label:
attr x = 1 << 8
text = str(x)
"""),
'leftshift newline update attr': (None, """
enamldef Main(Window):
Container:
Label:
text <<
return str(1 << 8)
"""),
'leftshift update attr': (None, """
enamldef Main(Window):
Container:
Label:
text << str(1 << 8)
"""),
'sub block var': (None, """
enamldef Main(Window):
Container:
Label:
text <<
x = 10
if x:
return 'ten'
return 'not ten'
"""),
}
@pytest.mark.parametrize('name', SUBSCRIPTION_BLOCK_TESTS.keys())
def test_subscription_block_syntax(name):
"""Test a subscription block operator does not interfere with the leftshift
operator.
"""
error, code = SUBSCRIPTION_BLOCK_TESTS[name]
source = dedent("""
from enaml.widgets.api import *
%s
""" % code.lstrip())
if error is not None:
with pytest.raises(error):
Main = compile_source(source, 'Main')
window = Main()
else:
Main = compile_source(source, 'Main')
window = Main()
# The following tests need to ensure that assignment in subscription block
# (either through a direct assignment or through the use of the walrus
# operator) do not cause issue with the tracer.
# Assignments can target the following scopes:
# - local to the block (only scope that the walrus operator target)
# - global module scope
# - widget and dynamic scope that can only be accessed qualified names (self.)
def test_subscription_block_observers1():
"""Test a subscription block operator.
"""
source = dedent("""\
from enaml.widgets.api import *
enamldef Main(Window):
alias label
attr a = 1
attr b = 2
Label: label:
text <<
if a & 1:
return 'a'
elif b & 1:
return 'b'
return 'none'
""")
Main = compile_source(source, 'Main')
window = Main()
label = window.label
assert label.text == 'a'
window.a = 2
assert label.text == 'none' # 2 and 2
window.b = 1
assert label.text == 'b'
window.a = 1
assert label.text == 'a'
def test_subscription_block_observers2():
"""Test that intermediate assignments (local) do not confuse the tracer.
"""
source = dedent("""\
from enaml.widgets.api import *
enamldef Main(Window):
alias label
attr a = 1
attr b = 2
Label: label:
text <<
b = a
if b & 1:
return 'a'
return 'none'
""")
Main = compile_source(source, 'Main')
window = Main()
label = window.label
assert label.text == 'a'
window.a = 2
assert label.text == 'none'
window.b = 1
assert label.text == 'none'
window.a = 1
assert label.text == 'a'
def test_subscription_block_observers3():
"""Test that handling recursive behavior works.
"""
source = dedent("""\
from enaml.widgets.api import *
enamldef Main(Window): main:
alias label
attr a = 1
attr b = 2
Label: label:
text <<
value = 'none'
if a & 1:
value = 'a'
elif b & 1:
value = 'b'
main.b = 2
return value
""")
Main = compile_source(source, 'Main')
window = Main()
label = window.label
assert label.text == 'a'
window.a = 2
assert label.text == 'none' # 2 and 2
window.b = 1
assert label.text == 'b'
assert window.b == 2
window.a = 1
assert label.text == 'a'
def test_subscription_block_observers4():
"""Test that global variable shadowed by local can be accessed.
"""
source = dedent("""\
from enaml.widgets.api import *
b = 2
enamldef Main(Window): main:
alias label
attr a = 1
attr b = 2
attr counter = 0
Label: label:
text <<
global b
main.counter += 1
if a & 1:
return 'a'
elif b & 1:
return 'b'
return 'none'
""")
Main = compile_source(source, 'Main')
window = Main()
label = window.label
assert label.text == 'a'
assert window.counter == 1
window.a = 2
assert label.text == 'none' # 2 and 2
assert window.counter == 2
window.b = 1
assert label.text == 'none'
assert window.counter == 2
window.a = 1
assert label.text == 'a'
assert window.counter == 3
def test_subscription_block_observers5():
"""Test that global variable shadowed by local do not block notification
on qualified name access.
"""
source = dedent("""\
from enaml.widgets.api import *
b = 2
enamldef Main(Window): main:
alias label
attr a = 1
attr b = 2
attr counter = 0
Label: label:
text <<
global b
main.counter += 1
if a & 1:
return 'a'
elif main.b & 1:
return 'b'
return 'none'
""")
Main = compile_source(source, 'Main')
window = Main()
label = window.label
assert label.text == 'a'
assert window.counter == 1
window.a = 2
assert label.text == 'none' # 2 and 2
assert window.counter == 2
window.b = 1
assert label.text == 'b'
assert window.counter == 3
window.a = 1
assert label.text == 'a'
assert window.counter == 4
@pytest.mark.skipif(sys.version_info < (3, 8), reason="Require Python 3.8+")
def test_subscription_operator_walrus():
"""Test handling the walrus operator inside a subscription.
"""
source = dedent("""\
from enaml.widgets.api import *
enamldef Main(Window):
alias label
alias label2
attr a = 1
attr b = 2
attr c = 5
Label: label:
text << f"{a + (c := b + 1)}"
Label: label2:
text << f"{c}"
""")
Main = compile_source(source, 'Main')
window = Main()
label = window.label
assert label.text == '4'
# This is the same behavior as everywhere else where access can use a bare name
# but assignment needs a qualified name.
assert window.label2.text == '5'
|
