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An unofficial backport of the JDK Classfile API to Java 17

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/*
 * Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package io.github.dmlloyd.classfile.impl;

import io.github.dmlloyd.classfile.Label;
import io.github.dmlloyd.classfile.instruction.CharacterRange;

public final class BoundCharacterRange
        extends AbstractElement
        implements CharacterRange {

    private final CodeImpl code;
    private final int offset;

    public BoundCharacterRange(CodeImpl code, int offset) {
        this.code = code;
        this.offset = offset;
    }

    int startPc() {
        return code.classReader.readU2(offset);
    }

    int endPc() {
        return code.classReader.readU2(offset + 2);
    }

    @Override
    public int characterRangeStart() {
        return code.classReader.readInt(offset + 4);
    }

    @Override
    public int characterRangeEnd() {
        return code.classReader.readInt(offset + 8);
    }

    @Override
    public int flags() {
        return code.classReader.readU2(offset + 12);
    }

    @Override
    public Label startScope() {
        return code.getLabel(startPc());
    }

    @Override
    public Label endScope() {
        return code.getLabel(endPc() + 1);
    }

    @Override
    public void writeTo(DirectCodeBuilder builder) {
        builder.addCharacterRange(this);
    }

    @Override
    public String toString() {
        return String.format("CharacterRange[startScope=%s, endScope=%s, characterRangeStart=%s, characterRangeEnd=%s, flags=%d]",
                startScope(), endScope(), characterRangeStart(), characterRangeEnd(), flags());
    }
}