/*
 * Copyright 2014, Google Inc.
 * All rights reserved.
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 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 */

package org.jf.smalidea.psi.impl;

import org.jetbrains.annotations.NotNull;
import org.jf.smalidea.psi.SmaliCompositeElementFactory;
import org.jf.smalidea.psi.SmaliElementTypes;

public class SmaliRegisterReference extends SmaliCompositeElement {
    public static final SmaliCompositeElementFactory FACTORY = new SmaliCompositeElementFactory() {
        @Override public SmaliCompositeElement createElement() {
            return new SmaliRegisterReference();
        }
    };

    public SmaliRegisterReference() {
        super(SmaliElementTypes.REGISTER_REFERENCE);
    }

    @NotNull
    public SmaliMethod getParentMethod() {
        SmaliMethod parentMethod = findAncestorByClass(SmaliMethod.class);
        assert parentMethod != null;
        return parentMethod;
    }

    public int getRegisterNumber() {
        int registerNumber = Integer.parseInt(getText().substring(1));

        if (isParameterRegister()) {
            SmaliMethod method = getParentMethod();
            registerNumber += method.getRegisterCount() - method.getParameterRegisterCount();
        }

        return registerNumber;
    }

    public boolean isParameterRegister() {
        return getText().charAt(0) == 'p';
    }
}