org.vesalainen.grammar.math.SimpleMathStateMachine Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of javalpg Show documentation

Syntactically extended parsers for regex, bnf, ...grammars

The newest version!

/*
 * Copyright (C) 2016 tkv
 *
 * 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 .
 */
package org.vesalainen.grammar.math;

import java.time.Clock;
import java.util.Set;
import java.util.function.Supplier;
import org.vesalainen.util.DoubleMap;

/**
 * SimpleMathStateMachine implements variables by using DoubleMap.
 * @author tkv
 * @see org.vesalainen.util.DoubleMap
 */
public class SimpleMathStateMachine extends AbstractMathStateMachine
{
    private DoubleMap map = new DoubleMap<>();

    public SimpleMathStateMachine(String start)
    {
        super(start);
    }

    public SimpleMathStateMachine(String start, boolean useDegrees)
    {
        super(start, useDegrees);
    }

    public SimpleMathStateMachine(String start, Supplier clockSupplier, boolean useDegrees)
    {
        super(start, clockSupplier, useDegrees);
    }
    /**
     * Assign value to named variable.
     * @param identifier
     * @param value 
     */
    public void setVariable(String identifier, double value)
    {
        map.put(identifier, value);
    }
    
    @Override
    protected double getVariable(String identifier)
    {
        return map.getDouble(identifier);
    }

    @Override
    protected void register(Set variables)
    {
        for (String v : variables)
        {
            if (!map.containsKey(v) && !v.startsWith("$"))
            {
                throw new IllegalArgumentException("variable "+v+" not set");
            }
        }
    }

    @Override
    protected void unregister(Set variables)
    {
    }
    
}