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assembler.py
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assembler.py
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import re
from parser import AssemblyParser
from translator import AsmTranslator
from symbol_table import SymbolTable
class HackAssembler:
def __init__(self, input_file: str) -> None:
self.machine_code: list[str] = []
self.current_symbol_idx: int = 0
self.symbol_table = SymbolTable()
self.translator = AsmTranslator()
self.parser = AssemblyParser(input_file)
def generate_symbol_table(self):
while self.parser.has_more_instr():
self.parser.next_instr()
if self.parser.curr_instr_type() != "L":
self.current_symbol_idx += 1
continue
self.symbol_table.add_symbol(self.parser.get_symbol_value(), self.current_symbol_idx)
self.parser.current_instr_idx = -1
def generate_machine_code(self):
while self.parser.has_more_instr():
self.parser.next_instr()
if self.parser.curr_instr_type() == "A":
symbol = self.parser.get_symbol_value()
if len(re.findall("\\d", symbol[0])) > 0:
val = int(symbol)
else:
if not self.symbol_table.contains(symbol):
self.symbol_table.add_symbol(symbol, self.symbol_table.free_address)
print("Appending", symbol, " to ", self.symbol_table.free_address)
self.symbol_table.free_address += 1
val = self.symbol_table.get_address(symbol)
val_string = "0{0:015b}".format(val)
self.machine_code.append(val_string)
continue
if self.parser.curr_instr_type() == "L":
continue
comp = "111{0:07b}".format(self.translator.comp(self.parser.get_comp()))
dest = "{0:03b}".format(self.translator.dest(self.parser.get_dest()))
jump = "{0:03b}".format(self.translator.jump(self.parser.get_jump()))
self.machine_code.append(comp + dest + jump)
def write_machine_code(self, output_file: str|None = None) -> None:
code_str = "\n".join(self.machine_code)
if output_file == None:
print(code_str)
return
with open(output_file, "w") as out:
out.write(code_str)