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package com.dragome.compiler.ast;

import com.dragome.compiler.generators.AbstractVisitor;

public class InfixExpression extends Expression
{

	static public class Operator
	{
		static public Operator CONDITIONAL_AND= new Operator("&&");

		static public Operator CONDITIONAL_OR= new Operator("||");

		static public Operator PLUS= new Operator("+");

		static public Operator MINUS= new Operator("-");

		static public Operator TIMES= new Operator("*");

		static public Operator DIVIDE= new Operator("/");

		static public Operator REMAINDER= new Operator("%");

		static public Operator XOR= new Operator("^");

		static public Operator AND= new Operator("&");

		static public Operator OR= new Operator("|");

		static public Operator EQUALS= new Operator("==");

		static public Operator NOT_EQUALS= new Operator("!=");

		static public Operator GREATER_EQUALS= new Operator(">=");

		static public Operator GREATER= new Operator(">");

		static public Operator LESS_EQUALS= new Operator("<=");

		static public Operator LESS= new Operator("<");

		static public Operator RIGHT_SHIFT_SIGNED= new Operator(">>");

		static public Operator LEFT_SHIFT= new Operator("<<");

		static public Operator RIGHT_SHIFT_UNSIGNED= new Operator(">>>");

		static
		{
			EQUALS.complement= NOT_EQUALS;
			NOT_EQUALS.complement= EQUALS;
			GREATER_EQUALS.complement= LESS;
			GREATER.complement= LESS_EQUALS;
			LESS_EQUALS.complement= GREATER;
			LESS.complement= GREATER_EQUALS;
			CONDITIONAL_AND.complement= CONDITIONAL_OR;
			CONDITIONAL_OR.complement= CONDITIONAL_AND;
		}

		private String token;

		private Operator complement;

		Operator(String theToken)
		{
			token= theToken;
		}

		public String toString()
		{
			return token;
		}

		public Operator getComplement()
		{
			return complement;
		}
	}

	private Operator operator;

	public InfixExpression(Operator op)
	{
		super();
		operator= op;
		if (operator.getComplement() != null)
			type= org.apache.bcel.generic.Type.BOOLEAN;
	}

	public void visit(AbstractVisitor visitor)
	{
		visitor.visit(this);
	}

	public Expression getLeftOperand()
	{
		return (Expression) getChildAt(0);
	}

	public void setOperands(Expression leftOperand, Expression rightOperand)
	{
		widen(leftOperand);
		widen(rightOperand);
		removeChildren();
		appendChild(leftOperand);
		appendChild(rightOperand);
	}

	public Expression getRightOperand()
	{
		return (Expression) getChildAt(1);
	}

	public Operator getOperator()
	{
		return operator;
	}

	public void setOperator(Operator theOperator)
	{
		operator= theOperator;
	}
}