public void compileLetStatement()
{
bool array = false;
string currentInstruction;
finalInstructions.Add("<letStatement>");
currentInstruction = printAndAdvance("XML");
finalInstructions.Add(currentInstruction); // let
currentInstruction = printAndAdvance("XML");
finalInstructions.Add(currentInstruction); // count
string valtoPop = currentInstruction;
if (nextChar() == "[")
{
array = true;
currentInstruction = printAndAdvance("XML");
finalInstructions.Add(currentInstruction); // [
finalInstructions.Add("<expression>");
compileExpression();
finalInstructions.Add("</expression>");
currentInstruction = printAndAdvance("XML");
finalInstructions.Add(currentInstruction); // ]
currentVMWriter.WritePushValue(valtoPop);
currentVMWriter.WriteArithmetic("+");
}
currentInstruction = printAndAdvance("XML");
finalInstructions.Add(currentInstruction); // =
finalInstructions.Add("<expression>");
compileExpression();
finalInstructions.Add("</expression>");
currentInstruction = printAndAdvance("XML");
if (array == true)
{
currentVMWriter.WritePop("temp", 0);
currentVMWriter.WritePop("pointer", 1);
currentVMWriter.WritePush("temp", "0");
currentVMWriter.WritePop("that", 0);
}
else
{
currentVMWriter.WritePopValue(valtoPop);
}
finalInstructions.Add(currentInstruction); // ;
finalInstructions.Add("</letStatement>");
}
public void CompileLet()
{
jtoken.Advance();
string strVariableName = jtoken.Identifier();
jtoken.Advance();
bool array = false;
if ((jtoken.TokenType().Equals("SYMBOL")) && (jtoken.Symbol() == '['))
{
array = true;
vmWriter.WritePush(symbolTable.KindOf(strVariableName), symbolTable.IndexOf(strVariableName));
CompileExpressionList();
jtoken.Advance();
if ((jtoken.TokenType().Equals("SYMBOL")) && (jtoken.Symbol() == ']'))
{
vmWriter.WriteArithmetic("add");
jtoken.Advance();
}
}
CompileExpressionList();
jtoken.Advance();
if (array)
{
vmWriter.WritePop("temp", 0);
vmWriter.WritePop("pointer", 1);
vmWriter.WritePush("temp", 0);
vmWriter.WritePop("that", 0);
}
else
{
vmWriter.WritePop(symbolTable.KindOf(strVariableName), symbolTable.IndexOf(strVariableName));
}
}
