class VMTranslator:
def vm_push(segment, offset):
”’Generate Hack Assembly code for a VM push operation”’
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def vm_pop(segment, offset):
”’Generate Hack Assembly code for a VM pop operation”’
def vm_add():
”’Generate Hack Assembly code for a VM add operation”’
def vm_sub():
”’Generate Hack Assembly code for a VM sub operation”’
def vm_neg():
”’Generate Hack Assembly code for a VM neg operation”’
def vm_eq():
”’Generate Hack Assembly code for a VM eq operation”’
def vm_gt():
”’Generate Hack Assembly code for a VM gt operation”’
def vm_lt():
”’Generate Hack Assembly code for a VM lt operation”’
def vm_and():
”’Generate Hack Assembly code for a VM and operation”’
def vm_or():
”’Generate Hack Assembly code for a VM or operation”’
def vm_not():
”’Generate Hack Assembly code for a VM not operation”’
def vm_label(label):
”’Generate Hack Assembly code for a VM label operation”’
def vm_goto(label):
”’Generate Hack Assembly code for a VM goto operation”’
def vm_if(label):
”’Generate Hack Assembly code for a VM if-goto operation”’
def vm_function(function_name, n_vars):
”’Generate Hack Assembly code for a VM function operation”’
def vm_call(function_name, n_args):
”’Generate Hack Assembly code for a VM call operation”’
def vm_return():
”’Generate Hack Assembly code for a VM return operation”’
# A quick-and-dirty parser when run as a standalone script.
if __name__ == “__main__”:
import sys
if(len(sys.argv) > 1):
with open(sys.argv[1], “r”) as a_file:
for line in a_file:
tokens = line.strip().lower().split()
if(len(tokens)==1):
if(tokens[0]==’add’):
print(VMTranslator.vm_add())
elif(tokens[0]==’sub’):
print(VMTranslator.vm_sub())
elif(tokens[0]==’neg’):
print(VMTranslator.vm_neg())
elif(tokens[0]==’eq’):
print(VMTranslator.vm_eq())
elif(tokens[0]==’gt’):
print(VMTranslator.vm_gt())
elif(tokens[0]==’lt’):
print(VMTranslator.vm_lt())
elif(tokens[0]==’and’):
print(VMTranslator.vm_and())
elif(tokens[0]==’or’):
print(VMTranslator.vm_or())
elif(tokens[0]==’not’):
print(VMTranslator.vm_not())
elif(tokens[0]==’return’):
print(VMTranslator.vm_return())
elif(len(tokens)==2):
if(tokens[0]==’label’):
print(VMTranslator.vm_label(tokens[1]))
elif(tokens[0]==’goto’):
print(VMTranslator.vm_goto(tokens[1]))
elif(tokens[0]==’if-goto’):
print(VMTranslator.vm_if(tokens[1]))
elif(len(tokens)==3):
if(tokens[0]==’push’):
print(VMTranslator.vm_push(tokens[1],int(tokens[2])))
elif(tokens[0]==’pop’):
print(VMTranslator.vm_pop(tokens[1],int(tokens[2])))
elif(tokens[0]==’function’):
print(VMTranslator.vm_function(tokens[1],int(tokens[2])))
elif(tokens[0]==’call’):
print(VMTranslator.vm_call(tokens[1],int(tokens[2])))
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