package luan.impl;

import java.util.Map;
import java.lang.reflect.InvocationTargetException;
import luan.LuanFunction;
import luan.LuanState;
import luan.LuanException;
import luan.LuanTable;
import luan.LuanJava;
import luan.modules.JavaLuan;
import luan.modules.PackageLuan;


public final class LuanCompiler {
	private LuanCompiler() {}  // never

	public static LuanFunction compile(LuanState luan,String sourceName,String sourceText,LuanTable env,boolean allowExpr) throws LuanException {
		LuanParser parser = new LuanParser(sourceName,sourceText);
		parser.addVar( "java" );
		parser.addVar( "require" );
		if( env != null )  parser.addVar( "_ENV" );
		Class fnClass = parse(parser,allowExpr);
		LuanJava java;
		if( env == null ) {
			java = new LuanJava();
		} else {
			java = env.java;
			if( java == null ) {
				java = new LuanJava();
				env.java = java;
			}
		}
		Closure closure;
		try {
			closure = (Closure)fnClass.getConstructor(LuanState.class,LuanJava.class).newInstance(luan,java);
		} catch(NoSuchMethodException e) {
			throw new RuntimeException(e);
		} catch(InstantiationException e) {
			throw new RuntimeException(e);
		} catch(IllegalAccessException e) {
			throw new RuntimeException(e);
		} catch(InvocationTargetException e) {
			throw new RuntimeException(e);
		}
		closure.upValues[0].o = JavaLuan.javaFn;
		closure.upValues[1].o = PackageLuan.requireFn;
		if( env != null )  closure.upValues[2].o = env;
		return closure;
	}

	private static Class parse(LuanParser parser,boolean allowExpr) throws LuanException {
		try {
			if( allowExpr ) {
				Class fnClass = parser.Expression();
				if( fnClass != null )
					return fnClass;
			}
			return parser.RequiredModule();
		} catch(ParseException e) {
e.printStackTrace();
			throw new LuanException( e.getFancyMessage() );
		}
	}
}