def test_parse_line():
a = Assembler()
lines = iter(src.splitlines())
assert a.parse_line(next(lines)) == (None, '.set', (
'const',
'123',
))
assert a.parse_line(next(lines)) == (None, '.set', (
'const_left',
'976',
))
assert a.parse_line(next(lines)) == None
assert a.parse_line(next(lines)) == ('start', 'wait', ('42', ))
assert a.parse_line(next(lines)) == (None, 'ld', (
'r0',
'r1',
'0',
))
assert a.parse_line(next(lines)) == (None, 'st', (
'r0',
'r1',
'0',
))
assert a.parse_line(next(lines)) == (None, 'halt', ())
assert a.parse_line(next(lines)) == ('end', None, ())
assert a.parse_line(next(lines)) == (
None, '.data', ()
) # test left-aligned directive is not treated as label
def test_parse_line():
a = Assembler()
lines = src.splitlines()
# note: line number = index + 1
assert a.parse_line(lines[0]) == None
assert a.parse_line(lines[1]) == ('start', 'wait', ('42', ))
assert a.parse_line(lines[2]) == (None, 'ld', (
'r0',
'r1',
'0',
))
assert a.parse_line(lines[3]) == (None, 'st', (
'r0',
'r1',
'0',
))
assert a.parse_line(lines[4]) == (None, 'halt', ())
assert a.parse_line(lines[5]) == ('end', None, ())
def test_parse_labels_correctly():
"""
description of what defines a label
https://sourceware.org/binutils/docs/as/Statements.html
https://sourceware.org/binutils/docs/as/Labels.html
"""
a = Assembler()
assert a.parse_line('') is None
assert a.parse_line('label: .set const, 42') == ('label', '.set', (
'const',
'42',
))
assert a.parse_line('label:.set const, 42') == ('label', '.set', (
'const',
'42',
))
assert a.parse_line('label:') == ('label', None, ())
assert a.parse_line(' label:') == ('label', None, ())
assert a.parse_line(' label: ') == ('label', None, ())
assert a.parse_line('nop ') == (None, 'nop', ())
assert a.parse_line('.set c, 1 ') == (None, '.set', (
'c',
'1',
))
assert a.parse_line('invalid : nop') == (
None, 'invalid', (': nop', )) # no whitespace between label and colon
assert a.parse_line('.string "hello world"') == (None, '.string',
('"hello world"', ))
assert a.parse_line('.string "hello : world"') == (None, '.string',
('"hello : world"', )
) # colon in string
assert a.parse_line('label::') == ('label', ':', ())
assert a.parse_line('label: :') == ('label', ':', ())
assert a.parse_line('a_label:') == ('a_label', None, ())
assert a.parse_line('$label:') == ('$label', None, ())
assert a.parse_line('.label:') == ('.label', None, ())
assert a.parse_line('&label:') == (None, '&label:', ()
) # & not a valid char in a label