ojman101.walkspeed.WalkspeedPlugin.java Source code

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Here is the source code for ojman101.walkspeed.WalkspeedPlugin.java

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/* Copyright (C) 2015 maaatts
    
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 3 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, see <http://www.gnu.org/licenses/>. */

package ojman101.walkspeed;

import org.objectweb.asm.Opcodes;
import org.objectweb.asm.tree.ClassNode;
import org.objectweb.asm.tree.LdcInsnNode;
import org.objectweb.asm.tree.MethodInsnNode;
import org.objectweb.asm.tree.MethodNode;

import me.themallard.bitmmo.api.analysis.util.pattern.Pattern;
import me.themallard.bitmmo.api.analysis.util.pattern.PatternBuilder;
import me.themallard.bitmmo.api.analysis.util.pattern.element.InstructionElement;
import me.themallard.bitmmo.api.analysis.util.pattern.element.LdcElement;
import me.themallard.bitmmo.api.util.Filter;
import me.themallard.bitmmo.impl.plugin.Plugin;
import me.themallard.bitmmo.impl.plugin.SimplePlugin;

@Plugin
public class WalkspeedPlugin extends SimplePlugin implements Opcodes {

    public WalkspeedPlugin() {
        super("Walkspeed");
        registerDependency(WalkspeedInject.class);
        registerInstanceCreation("ojman101/walkspeed/WalkspeedInject");

        addFilter(new Filter<ClassNode>() {
            @Override
            public boolean accept(ClassNode cn) {
                String refactored = getRefactoredName(cn.name);
                return refactored != null && refactored.equals("Player");
            }
        });
    }

    @Override
    public void run(ClassNode cn) {
        masterWalkSpeed(cn);
        roadWalkSpeed(cn);
        sandWalkSpeed(cn);
    }

    public void masterWalkSpeed(ClassNode cn) {
        Pattern p = new PatternBuilder().add(new LdcElement(new LdcInsnNode(0.08D))).build();

        for (MethodNode mn : cn.methods) {
            int offset = p.getOffset(mn.instructions);

            if (offset != -1) {
                LdcInsnNode ldc = (LdcInsnNode) mn.instructions.get(offset);
                mn.instructions.insert(ldc, new MethodInsnNode(INVOKESTATIC, "ojman101/walkspeed/WalkspeedInject",
                        "getWalkSpeed", "()D", false));
                mn.instructions.remove(ldc);
                break;
            }
        }
    }

    public void roadWalkSpeed(ClassNode cn) {
        Pattern p = new PatternBuilder().add(new LdcElement(new LdcInsnNode(2.0D)), new InstructionElement(DMUL),
                new InstructionElement(DSTORE)).build();

        for (MethodNode mn : cn.methods) {
            int offset = p.getOffset(mn.instructions);

            if (offset != -1) {
                LdcInsnNode ldc = (LdcInsnNode) mn.instructions.get(offset);
                mn.instructions.insert(ldc, new MethodInsnNode(INVOKESTATIC, "ojman101/walkspeed/WalkspeedInject",
                        "getRoadWalkSpeed", "()D", false));
                mn.instructions.remove(ldc);
                break;
            }
        }
    }

    public void sandWalkSpeed(ClassNode cn) {
        Pattern p = new PatternBuilder().add(new LdcElement(new LdcInsnNode(2.0D)), new InstructionElement(DDIV),
                new InstructionElement(DSTORE)).build();

        for (MethodNode mn : cn.methods) {
            int offset = p.getOffset(mn.instructions);

            if (offset != -1) {
                LdcInsnNode ldc = (LdcInsnNode) mn.instructions.get(offset);
                mn.instructions.insert(ldc, new MethodInsnNode(INVOKESTATIC, "ojman101/walkspeed/WalkspeedInject",
                        "getSandWalkSpeed", "()D", false));
                mn.instructions.remove(ldc);
                mn.instructions.get(offset + 1).setOpcode(DMUL);
                break;
            }
        }
    }
}