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Add support for ASCII chars as immediate values

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This commit is contained in:
Mike Naberezny 2014-12-14 18:50:28 -08:00
parent 32a998abaf
commit 23bd9b9a39
2 changed files with 18 additions and 2 deletions
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12
py65/assembler.py
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@ -55,6 +55,7 @@ class Assembler:
match = pattern.match(operand)
if match:
# check if opcode supports this addressing mode
try:
bytes = [self._mpu.disassemble.index((opcode, mode))]
except ValueError:
@ -98,9 +99,16 @@ class Assembler:
if match:
before, target, after = match.groups()
# target is an immediate number
# target is an immediate value
if target.startswith('#'):
number = self._address_parser.number(target[1:])
if target[1] in ("'", '"'): # quoted ascii character
try:
number = ord(target[2])
except IndexError:
raise SyntaxError(statement)
else:
number = self._address_parser.number(target[1:])
if (number < 0x00) or (number > self._mpu.byteMask):
raise OverflowError
statement = before + '#$' + self._mpu.BYTE_FORMAT % number

8
py65/tests/test_assembler.py
View File

@ -22,6 +22,8 @@ class AssemblerTests(unittest.TestCase):
def test_assemble_bad_syntax_raises_syntaxerror(self):
self.assertRaises(SyntaxError,
self.assemble, 'foo')
self.assertRaises(SyntaxError,
self.assemble, 'lda #"')
def test_assemble_bad_label_raises_keyerror(self):
self.assertRaises(KeyError,
@ -820,6 +822,12 @@ class AssemblerTests(unittest.TestCase):
self.assertEqual([0xa9, 0x44],
self.assemble('LDA #$44'))
def test_assembles_a9_ascii(self):
self.assertEqual([0xa9, 0x48],
self.assemble("LDA #'H"))
self.assertEqual([0xa9, 0x49],
self.assemble('LDA #"I'))
def test_assembles_aa(self):
self.assertEqual([0xaa],
self.assemble('TAX'))