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ModelCC is a model-based parser generator (a.k.a. compiler compiler) that decouples language specification from language processing, avoiding some of the problems caused by grammar-driven parser generators. ModelCC receives a conceptual model as input, along with constraints that annotate it. It is then able to create a parser for the desired textual language and the generated parser fully automates the instantiation of the language conceptual model. ModelCC also includes a built-in reference resolution mechanism that results in abstract syntax graphs, rather than mere abstract syntax trees.

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/*
 * ModelCC, distributed under ModelCC Shared Software License, www.modelcc.org
 */

package org.modelcc.parser.fence;

import java.io.Serializable;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

import org.modelcc.language.syntax.Symbol;

/**
 * Syntax graph.
 * 
 * @author Luis Quesada ([email protected])
 */
public final class SyntaxGraph implements Serializable {

    /**
     * Set of symbols used in this graph.
     */
    private Set symbols;

    /**
     * Set of root symbols in this graph.
     */
    private Set roots;

    
    /**
     * Default constructor.
     */
    public SyntaxGraph() 
    {
        this.symbols = new HashSet(256);
        this.roots = new HashSet();
    }

    /**
     * @return the roots symbols of this graph.
     */
    public Set getRoots() 
    {
        return Collections.unmodifiableSet(roots);
    }
    
    public void addStart (Symbol s)
    {
    	roots.add(s);
    }

    /**
     * @return the symbols used in this graph.
     */
    public Set getSymbols() 
    {
        return Collections.unmodifiableSet(symbols);
    }
    
    public void add (Symbol s)
    {
    	symbols.add(s);
    }
    
    public void remove (Symbol s)
    {
    	symbols.remove(s);
    	roots.remove(s);
    }

}