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Dynamic scripting for the JVM

There is a newer version: 1.4.6

package org.snapscript.parse;

import java.util.LinkedHashMap;
import java.util.Map;

public class SyntaxCompiler {
   
   private final Iterable definitions;
   private final Map grammars;
   private final GrammarCompiler compiler;
   private final GrammarResolver resolver;
   private final GrammarIndexer indexer;
   private final SyntaxParser parser;

   public SyntaxCompiler(String file) {
      this.grammars = new LinkedHashMap();      
      this.resolver = new GrammarResolver(grammars);
      this.indexer = new GrammarIndexer();
      this.parser = new SyntaxParser(resolver, indexer);      
      this.compiler = new GrammarCompiler(resolver, indexer);
      this.definitions = new GrammarReader(file);
   } 

   public synchronized SyntaxParser compile() {
      if(grammars.isEmpty()) { 
         for(GrammarDefinition definition : definitions) {
            String name = definition.getName();
            String value = definition.getDefinition();
            Grammar grammar = compiler.process(name, value);
            
            grammars.put(name, grammar);
         }
      }
      return parser;
   }
}