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An unofficial backport of the JDK Classfile API to Java 17
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/*
 * Copyright (c) 2023, 2024, 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.CodeBuilder;
import io.github.dmlloyd.classfile.CodeElement;
import io.github.dmlloyd.classfile.Label;
import io.github.dmlloyd.classfile.components.CodeRelabeler;
import io.github.dmlloyd.classfile.instruction.*;
import java.util.function.BiFunction;

public record CodeRelabelerImpl(BiFunction mapFunction) implements CodeRelabeler {

    public Label relabel(Label label, CodeBuilder cob) {
        return mapFunction.apply(label, cob);
    }

    @Override
    public void accept(CodeBuilder cob, CodeElement coe) {
        if (coe instanceof BranchInstruction bi)
            cob.branch(
                    bi.opcode(),
                    relabel(bi.target(), cob));
        else if (coe instanceof LookupSwitchInstruction lsi)
            cob.lookupswitch(
                    relabel(lsi.defaultTarget(), cob),
                    lsi.cases().stream().map(c ->
                            SwitchCase.of(
                                    c.caseValue(),
                                    relabel(c.target(), cob))).toList());
        else if (coe instanceof TableSwitchInstruction tsi)
            cob.tableswitch(
                    tsi.lowValue(),
                    tsi.highValue(),
                    relabel(tsi.defaultTarget(), cob),
                    tsi.cases().stream().map(c ->
                            SwitchCase.of(
                                    c.caseValue(),
                                    relabel(c.target(), cob))).toList());
        else if (coe instanceof LabelTarget lt)
            cob.labelBinding(
                    relabel(lt.label(), cob));
        else if (coe instanceof ExceptionCatch ec)
            cob.exceptionCatch(
                    relabel(ec.tryStart(), cob),
                    relabel(ec.tryEnd(), cob),
                    relabel(ec.handler(), cob),
                    ec.catchType());
        else if (coe instanceof LocalVariable lv)
            cob.localVariable(
                    lv.slot(),
                    lv.name().stringValue(),
                    lv.typeSymbol(),
                    relabel(lv.startScope(), cob),
                    relabel(lv.endScope(), cob));
        else if (coe instanceof LocalVariableType lvt)
            cob.localVariableType(
                    lvt.slot(),
                    lvt.name().stringValue(),
                    lvt.signatureSymbol(),
                    relabel(lvt.startScope(), cob),
                    relabel(lvt.endScope(), cob));
        else if (coe instanceof CharacterRange chr)
            cob.characterRange(
                    relabel(chr.startScope(), cob),
                    relabel(chr.endScope(), cob),
                    chr.characterRangeStart(),
                    chr.characterRangeEnd(),
                    chr.flags());
        else
            cob.with(coe);
    }

}