proguard.obfuscate.kotlin.KotlinValueParameterNameShrinker Maven / Gradle / Ivy

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ProGuard is a free shrinker, optimizer, obfuscator, and preverifier for Java bytecode
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/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification
 *             of Java bytecode.
 *
 * Copyright (c) 2002-2021 Guardsquare NV
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * This program 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 for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.obfuscate.kotlin;

import proguard.classfile.Clazz;
import proguard.classfile.kotlin.*;
import proguard.classfile.kotlin.visitor.*;

/**
 * This KotlinValueParameterVisitor removes the name of ValueParameters that it visits, based on the markings of the
 * {@link KotlinValueParameterUsageMarker}.
 */
public class   KotlinValueParameterNameShrinker
    implements KotlinMetadataVisitor,
               KotlinConstructorVisitor,
               KotlinPropertyVisitor,
               KotlinFunctionVisitor
{

    // Implementations for KotlinMetadataVisitor.

    @Override
    public void visitAnyKotlinMetadata(Clazz clazz, KotlinMetadata kotlinMetadata) {}


    @Override
    public void visitKotlinDeclarationContainerMetadata(Clazz                              clazz,
                                                        KotlinDeclarationContainerMetadata kotlinDeclarationContainerMetadata)
    {
        kotlinDeclarationContainerMetadata.functionsAccept(clazz, this);
        kotlinDeclarationContainerMetadata.propertiesAccept(clazz,this);
    }


    @Override
    public void visitKotlinClassMetadata(Clazz clazz, KotlinClassKindMetadata kotlinClassKindMetadata)
    {
        kotlinClassKindMetadata.constructorsAccept(clazz, this);
        visitKotlinDeclarationContainerMetadata(clazz, kotlinClassKindMetadata);
    }


    @Override
    public void visitKotlinSyntheticClassMetadata(Clazz                            clazz,
                                                  KotlinSyntheticClassKindMetadata kotlinSyntheticClassKindMetadata)
    {
        kotlinSyntheticClassKindMetadata.functionsAccept(clazz, this);
    }


    // Implementations for KotlinConstructorVisitor.


    @Override
    public void visitConstructor(Clazz                     clazz,
                                 KotlinClassKindMetadata   kotlinClassKindMetadata,
                                 KotlinConstructorMetadata kotlinConstructorMetadata)
    {
        kotlinConstructorMetadata.valueParametersAccept(clazz,
                                                        kotlinClassKindMetadata,
                                                        new MyValueParameterShrinker());
    }


    // Implementations for KotlinPropertyVisitor.


    @Override
    public void visitAnyProperty(Clazz                              clazz,
                                 KotlinDeclarationContainerMetadata kotlinDeclarationContainerMetadata,
                                 KotlinPropertyMetadata             kotlinPropertyMetadata)
    {
        kotlinPropertyMetadata.setterParametersAccept(clazz,
                                                      kotlinDeclarationContainerMetadata,
                                                      new MyValueParameterShrinker());
    }


    // Implementations for KotlinFunctionVisitor.


    @Override
    public void visitAnyFunction(Clazz                  clazz,
                                 KotlinMetadata         kotlinMetadata,
                                 KotlinFunctionMetadata kotlinFunctionMetadata)
    {
        kotlinFunctionMetadata.valueParametersAccept(clazz,
                                                     kotlinMetadata,
                                                     new MyValueParameterShrinker());
    }


    private static class MyValueParameterShrinker implements KotlinValueParameterVisitor
    {
        private int parameterNumber = 0;

        @Override
        public void visitAnyValueParameter(Clazz clazz, KotlinValueParameterMetadata kotlinValueParameterMetadata)
        {
            if (!KotlinValueParameterUsageMarker.isUsed(kotlinValueParameterMetadata))
            {
                kotlinValueParameterMetadata.parameterName = "p" + parameterNumber++;
            }
        }
    }
}