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The Protelis language interpreter

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/*
 * Copyright (C) 2021, Danilo Pianini and contributors listed in the project's build.gradle.kts or pom.xml file.
 *
 * This file is part of Protelis, and is distributed under the terms of the GNU General Public License,
 * with a linking exception, as described in the file LICENSE.txt in this project's top directory.
 */
package org.protelis.lang.interpreter.impl;

import java.util.List;

import org.protelis.lang.interpreter.ProtelisAST;
import org.protelis.lang.interpreter.util.Bytecode;
import org.protelis.lang.loading.Metadata;
import org.protelis.vm.ExecutionContext;

/**
 * Evaluate a sequence of statements, returning the value of the last statement.
 */
public final class All extends AbstractProtelisAST {

    private static final long serialVersionUID = -210610136469863525L;
    private final int last;

    /**
     * Block of statements.
     * 
     * @param metadata
     *            A {@link Metadata} object containing information about the code that generated this AST node.
     * @param statements
     *            the statements
     */
    public All(final Metadata metadata, final List> statements) {
        super(metadata, statements);
        last = statements.size() - 1;
    }

    @Override
    public Object evaluate(final ExecutionContext context) {
        for (int b = 0; b < getBranchesNumber() - 1; b++) {
            getBranch(b).eval(context);
            context.newCallStackFrame(b);
        }
        final Object result = getBranch(last).eval(context);
        for (int b = 0; b < getBranchesNumber() - 1; b++) {
            context.returnFromCallFrame();
        }
        return result;
    }

    @Override
    public String getName() {
        switch (getBranchesNumber()) {
        case 1:
            return getBranch(last).getName();
        case 2:
            return getBranch(0).getName() + "; " + getBranch(last).getName();
        default:
            return getBranch(0).getName() + "; ...; " + getBranch(last).getName();
        }
    }

    @Override
    public String toString() {
        return getName();
    }

    @Override
    public Bytecode getBytecode() {
        return Bytecode.ALL;
    }

}
    

    

    

            

    

            



    
    






    
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