package io.gitlab.jfronny.muscript.ast;

import io.gitlab.jfronny.muscript.compiler.*;
import io.gitlab.jfronny.muscript.data.Scope;
import io.gitlab.jfronny.muscript.data.dynamic.DNull;
import io.gitlab.jfronny.muscript.annotations.CanThrow;
import io.gitlab.jfronny.muscript.ast.literal.DynamicLiteral;
import io.gitlab.jfronny.muscript.error.LocationalException;

import java.io.IOException;

@CanThrow
public final class NullLiteral extends Expr<Object> {
    public NullLiteral(int chStart, int chEnd) {
        super(Order.Primary, chStart, chEnd);
    }

    @Override
    public Type getResultType() {
        return Type.Dynamic;
    }

    @Override
    public Object get(Scope dataRoot) {
        return null;
    }

    @Override
    public NullLiteral optimize() {
        return this;
    }

    @Override
    public void decompile(ExprWriter writer) throws IOException {
        writer.append("null");
    }

    @Override
    public DynamicExpr asDynamicExpr() {
        return new DynamicLiteral<>(chStart, chEnd, new DNull());
    }

    @Override
    public NumberExpr asNumberExpr() {
        throw new LocationalException(chStart, chEnd, "Attempted to convert null to a number");
    }

    @Override
    public StringExpr asStringExpr() {
        return literal(chStart, chEnd, "null");
    }

    @Override
    public BoolExpr asBoolExpr() {
        throw new LocationalException(chStart, chEnd, "Attempted to convert null to a boolean");
    }

    @Override
    public boolean equals(Object obj) {
        return obj instanceof NullLiteral;
    }
}