class Assembler():
NewSymbolAdd = 16
def __init__(self, readfile):
self.readfile = readfile
self.writefile = readfile.replace(
'.asm', '.hack'
) #creates new output file named the same as input file but with .hack extension
self.symboltable = SymbolTable() #populates symbol table
def FirstPass(
self
): #grabs (xxx) symbols and notes them in symbol tables with the correct address
firstPassParser = Parser(self.readfile)
firstPassAddress = 0
while firstPassParser.hasMoreCommands():
firstPassParser.advance()
if (firstPassParser.commandType() == 'A_COMMAND'
or firstPassParser.commandType() == 'C_COMMAND'):
firstPassAddress += 1
elif firstPassParser.commandType() == 'L_COMMAND':
print(firstPassParser.command)
self.symboltable.addEntry(firstPassParser.symbol(),
firstPassAddress)
def SecondPass(self):
secondPassParser = Parser(self.readfile)
outfile = open(self.writefile, 'w+')
code = Code()
while secondPassParser.hasMoreCommands():
secondPassParser.advance()
if secondPassParser.commandType() == 'A_COMMAND':
if secondPassParser.symbol().isdigit():
writeline = '0' + ('{0:b}'.format(
int(secondPassParser.symbol())).zfill(15))
outfile.write(writeline + '\n')
elif self.symboltable.contains(secondPassParser.symbol(
)): # if symbol is in table write binary to file
writeline = '0' + '{0:b}'.format(
self.symboltable.GetAddress(secondPassParser.symbol())
).zfill(
15
) #makes writeline with 0 (a instruction)+15 bit address of symbol
outfile.write(writeline + '\n')
else: #if symbol is not in table add to table then write to file in binary
self.symboltable.addEntry(secondPassParser.symbol(),
self.NewSymbolAdd)
self.NewSymbolAdd += 1
writeline2 = '0' + '{0:b}'.format(
self.symboltable.GetAddress(
secondPassParser.symbol())).zfill(15)
outfile.write(writeline2 + '\n')
if secondPassParser.commandType() == 'C_COMMAND':
writelineC = '111' + code.comp_conv(
secondPassParser.comp()) + code.dest_conv(
secondPassParser.dest()) + code.jump_conv(
secondPassParser.jump())
outfile.write(writelineC + '\n')
'''
if secondPassParser.commandType()=='L_COMMAND':
if self.symboltable.contains(secondPassParser.symbol()):
writeline=writeline='0'+('{0:b}'.format(self.symboltable.GetAddress(secondPassParser.symbol())).zfill(15))
else:
continue
'''
outfile.close()
