func newLoC(input string, sourceIndex int) *LoC {
input = translation.TrimBlanks(translation.TrimComment(input))
loc := new(LoC)
loc.input = input
loc.isLabel = strings.HasPrefix(input, "(") && strings.HasSuffix(input, ")")
loc.isAInstruction = strings.HasPrefix(input, "@")
loc.isCInstruction = !loc.isLabel && !loc.isAInstruction && input != ""
loc.isRedundant = !loc.isLabel && !loc.isAInstruction && !loc.isCInstruction
loc.sourceIndex = sourceIndex
if loc.isAInstruction || loc.isCInstruction {
loc.targetIndex = instructionCount
instructionCount++
} else {
loc.targetIndex = -1
}
return loc
}
func translateSingleFile(input string) (output string) {
lines := strings.Split(input, "\n")
for _, line := range lines {
trimmedLine := translation.TrimComment(line)
if trimmedLine == "" {
continue
} else {
tokens := tokenize(trimmedLine)
switch tokens[0] {
case "push":
output += "//push\n"
output += push(tokens[1], tokens[2])
case "pop":
output += "//pop\n"
output += pop(tokens[1], tokens[2])
case "neg":
output += "//neg\n"
output += unaryComputation("-")
case "not":
output += "//not\n"
output += unaryComputation("!")
case "add":
output += "//add\n"
output += generateBinaryComputation("+")
case "sub":
output += "//sub\n"
output += generateBinaryComputation("-")
case "and":
output += "//and\n"
output += generateBinaryComputation("&")
case "or":
output += "//or\n"
output += generateBinaryComputation("|")
case "eq":
output += "//eq\n"
output += comparison("JEQ")
case "lt":
output += "//lt\n"
output += comparison("JLT")
case "gt":
output += "//gt\n"
output += comparison("JGT")
case "label":
output += label(tokens[1])
case "goto":
output += "//goto\n"
output += unconditionalGoto(tokens[1])
case "if-goto":
output += "//if-goto\n"
output += ifGoto(tokens[1])
case "call":
output += "//call\n"
output += call(tokens[1], tokens[2])
case "return":
output += "//return\n"
output += returnStatment()
case "function":
output += "//function\n"
output += function(tokens[1], tokens[2])
default:
panic("unknown operation: " + tokens[0])
}
}
}
output += "(END)\n"
output += "@END\n"
output += "D;JMP\n"
return
}