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import sys
if len(sys.argv) != 2:
print("no source file")
sys.exit(1)
lines = []
with open(sys.argv[1], 'r') as file:
lines = file.readlines()
opcodes = {
"AND": 0, "ADD": 1, "LDA": 2, "STA": 3, "BUN": 4, "BSA": 5, "ISZ": 6,
"CLA": 0x7800, "CLE": 0x7400, "CMA": 0x7200, "CME": 0x7100, "CIR": 0x7080,
"CIL": 0x7040, "INC": 0x7020, "SPA": 0x7010, "SNA": 0x7008, "SZA": 0x7004,
"SZE": 0x7002, "HLT": 0x7001, "INP": 0xF800, "OUT": 0xF400, "SKI": 0xF200,
"SKO": 0xF100, "ION": 0xF080, "IOF": 0xF040
}
labels = {}
# collect all labels in the file
lc = 0
for i, line in enumerate(lines):
comment_index = line.find('/')
if (comment_index != -1):
line = line[:comment_index]
lines[i] = lines[i][:comment_index]
parts = line.split()
if (len(parts) == 0):
continue
if (parts[0][-1] == ','):
labels[parts[0][:-1]] = lc
k = line.find(',')
lines[i] = lines[i][k+1:]
lines[i] = lines[i].strip()
if (parts[0].upper() == "ORG"):
lc = int(parts[1], 16)
continue
lc += 1
print(labels)
# print hex equivalent line by line
lc = 0
for line in lines:
parts = line.split()
n = len(parts)
if (n == 0): continue
ins = -1
parts[0] = parts[0].upper()
match parts[0]:
case "ORG":
lc = int(parts[1], 16)
continue
case "HEX":
ins = int(parts[1], 16)
n = 0
case "DEC":
ins = int(parts[1])
n = 0
case "END":
break
if n > 0:
if parts[0] not in opcodes:
print(f"line {lines.index(line)}: {line}")
print("error: wrong mnemonic")
break;
ins = opcodes[parts[0]]
if n > 2:
parts[2] = parts[2].upper()
if parts[2] == 'I': ins += 8;
if n > 1:
if parts[1] not in labels:
print(f"line {lines.index(line)}: {line}")
print("error: label not found")
break;
ins = ins << 12
ins = ins | labels[parts[1]]
if ins != -1:
print(f"{lc:03x}: {ins & 0xffff:04x}")
lc += 1
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