def main():
filename = sys.argv[1]
output = open(filename.split('.')[0] + '.hack', 'w')
firstPass = Parser(filename)
symbolTable = SymbolTable()
rom_address = 0
ramAddress = 16
# First pass adds L_COMMANDs and ROM addresses to symbol table
while firstPass.hasMoreCommands():
firstPass.advance()
command = firstPass.commandType()
if command == 'A_COMMAND' or command == 'C_COMMAND':
rom_address += 1
elif command == 'L_COMMAND':
symbolTable.addEntry(firstPass.symbol(), rom_address)
# When A_COMMAND is encountered:
# if symbol is a digit write it to file
# if symbol is not a digit, look it up in the symbol table. If it's there, write the address
# if symbol is not a digit, look it up in the symbol table. If it is not there, add it then write the address
secondPass = Parser(filename)
while secondPass.hasMoreCommands():
secondPass.advance()
command = secondPass.commandType()
symbol = secondPass.symbol()
if command == 'A_COMMAND' and symbol:
if symbol.isdigit():
output.write('0' + '{0:015b}'.format(int(symbol)) + '\n')
elif symbolTable.contains(symbol):
symbolAddress = symbolTable.getAddress(symbol)
output.write('0' + '{0:015b}'.format(int(symbolAddress)) +
'\n')
else:
symbolTable.addEntry(symbol, ramAddress)
ramAddress += 1
symbolAddress = symbolTable.getAddress(symbol)
output.write('0' + '{0:015b}'.format(int(symbolAddress)) +
'\n')
else:
dest = Code.dest(secondPass.dest())
jump = Code.jump(secondPass.jump())
comp = Code.comp(secondPass.comp())
if comp != None:
output.write('111' + comp + dest + jump + '\n')
output.close()
OUT=open(out_file,'w')
par2 = Parser(in_file,extended_op)
toWrite=''
output=''
#Keeps count for general error reporting
overall_line_num=0
#Builds the output
while par2.hasMoreCommands():
par2.advance()
if re.search('A_COMMAND',par2.commandType()) is not None:
toWrite+=symT.getAddress(par2.symbol())
elif re.search('C_COMMAND',par2.commandType()) is not None:
toWrite='111' #Begining of c instruction
#If m is involved in the computation sets a to 1
if re.search('.*M.*',par2.comp()) is None:
toWrite+='0'
else:
toWrite+='1'
toWrite+=code.comp(par2.comp(),overall_line_num)
toWrite+=code.dest(par2.dest(),overall_line_num,extended_op)
toWrite+=code.jump(par2.jump(),overall_line_num)
overall_line_num+=1
current_directory = os.path.dirname(os.path.abspath(__file__))
outfilename = os.path.join(current_directory, os.path.splitext(basename)[0] + '.hack')
outfile = open(outfilename, 'w')
next_available_ram_address = '16'
while parser.hasMoreCommands():
if parser.getLabel():
# if its a label, skip this line and go to next loop iteration
parser.advance()
continue
elif parser.getCommandType() == 'A':
value = parser.address()
if parser.isSymbol():
# add new symbol to the table if it's not already there
if not symbol_table.getAddress(value):
symbol_table.updateTable(value, next_available_ram_address)
next_available_ram_address = str(int(next_available_ram_address) + 1)
value = symbol_table.getAddress(value)
out = Code.toBinary(value, 16)
else:
d = parser.dest()
c = parser.comp()
j = parser.jump()
dd = Code.dest(d)
cc = Code.comp(c)
jj = Code.jump(j)
out = "111" + cc + dd + jj
outfile.write(out + '\n')
parser.advance()
