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build.{dsl,res}: allow removing attributes from subsignals.

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This is useful when most attributes in a large composite resource
are the same, but a few signals are different, and also when building
abstractions around resources.

Fixes #128.
This commit is contained in:
whitequark 2019-07-08 10:41:45 +00:00
parent f0c1c2cfeb
commit 0b844da4cf
3 changed files with 17 additions and 6 deletions
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7
nmigen/test/test_build_dsl.py
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@ -113,9 +113,14 @@ class AttrsTestCase(FHDLTestCase):
self.assertEqual(a["IO_STANDARD"], "LVCMOS33")
self.assertEqual(repr(a), "(attrs IO_STANDARD=LVCMOS33 PULLUP=1)")
def test_remove(self):
a = Attrs(FOO=None)
self.assertEqual(a["FOO"], None)
self.assertEqual(repr(a), "(attrs !FOO)")
def test_wrong_value(self):
with self.assertRaises(TypeError,
msg="Attribute value must be a string, not 1"):
msg="Attribute value must be None or str, not 1"):
a = Attrs(FOO=1)