package frontend.ast.exp;

import frontend.ast.Node;
import frontend.ast.NodeStack;
import frontend.ast.SyntaxType;
import frontend.lexer.TokenStream;
import frontend.lexer.TokenType;
import frontend.ast.token.TokenNode;
import error.Errors;

public class LOrExp extends Node {
    public LOrExp(TokenStream ts) {
        super(SyntaxType.LOR_EXP, ts);
    }

    public void parse(Errors errors) {
        NodeStack stack = new NodeStack();
        while (true) {
            LAndExp andexp = new LAndExp(this.ts);
            andexp.parse(errors);
            stack.push(andexp);
            if (getCurrToken().getType() == TokenType.OR) {
                stack.push(new TokenNode(ts)); // lorop
            } else {
                break;
            }
        }
        if (stack.size() == 1) {
            this.addChild((LAndExp)stack.pop());
        } else {
            LOrExp temp = this;
            while(stack.size() > 1) {
                LOrExp loe = new LOrExp(this.ts);
                LAndExp lae = (LAndExp)stack.pop();
                TokenNode lorop = (TokenNode)stack.pop();
                temp.addChild(loe);
                temp.addChild(lorop);
                temp.addChild(lae);
                temp = loe;
            }
            temp.addChild((LAndExp)stack.pop());
        }
    }
}