//
// letStatement: 'let' varName ('[' expression ']')? '=' expression ';'
public void CompileLetStatement(int depth)
{
bool isLeftArray = false;
// compile: 'let'
var letToken = Eat("let");
// compile: varName
var varNameToken = EatIdentifier();
var sbVarName = SymbolTableManager.Find(varNameToken.Value);
// compile: ('[' expression ']')?
if (_tokenizer.CurrentToken.Value == "[")
{
isLeftArray = true;
// compile: '['
var leftBracketToken = Eat("[");
// compile: expression
CompileExpression(depth + 1, AssignmentType.LEFT);
// write array
_vmWriter.WritePush(sbVarName.KindDisplay, sbVarName.Number);
_vmWriter.WriteOp(new Token {
Value = "+"
});
// compile: ']'
var rightBracketToken = Eat("]");
}
// compile: '='
var assignmentToken = Eat("=");
// compile: expression
CompileExpression(depth + 1, AssignmentType.RIGHT);
// pop varAssigned
if (isLeftArray)
{
_vmWriter.WritePop("temp", 0);
_vmWriter.WritePop("pointer", 1);
_vmWriter.WritePush("temp", 0);
_vmWriter.WritePop("that", 0);
}
else
{
_vmWriter.WritePop(sbVarName.KindDisplay, sbVarName.Number);
}
// compile: ';'
var semiColonToken = Eat(";");
}
