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A lightweight,high performance expression evaluator for java

There is a newer version: 5.4.3

package com.googlecode.aviator;

import com.googlecode.aviator.runtime.JavaMethodReflectionFunctionMissing;

/**
 * AviatorScript bootstrap
 *
 * @author dernnis([email protected])
 *
 */
public class Main {

  public static void main(final String[] args) throws Exception {
    if (args == null || args.length < 1) {
      System.err.println("Usage: java com.googlecode.aviator.Main [file] [args]");
      System.err.println("     : java com.googlecode.aviator.Main -e [script]");
      System.err.println("     : java com.googlecode.aviator.Main -v");
      System.exit(1);
    }

    AviatorEvaluator.getInstance().setOption(Options.FEATURE_SET, Feature.getFullFeatures());
    AviatorEvaluator.getInstance()
        .setFunctionMissing(JavaMethodReflectionFunctionMissing.getInstance());

    final String cmdOrPath = args[0];
    if (cmdOrPath.equals("-v") || cmdOrPath.equals("--version")) {
      System.out.println("AviatorScript " + AviatorEvaluator.VERSION);
      System.exit(0);
    } else if (cmdOrPath.equals("-e") || cmdOrPath.equals("--execute")) {
      if (args.length < 2) {
        System.err.println("Usage: java com.googlecode.aviator.Main -e [script]");
        System.exit(1);
      }
      String script = args[1];
      String[] remainArgs = getRemainArgs(args, 2);
      Expression exp = AviatorEvaluator.getInstance().compile(script);
      System.out.println(exp.execute(exp.newEnv("ARGV", remainArgs)));
    } else {
      String[] remainArgs = getRemainArgs(args, 1);
      Expression exp = AviatorEvaluator.getInstance().compileScript(cmdOrPath);

      exp.execute(exp.newEnv("ARGV", remainArgs));
    }

  }

  private static String[] getRemainArgs(final String[] args, final int startPos) {
    String[] remainArgs = new String[args.length - startPos];
    System.arraycopy(args, startPos, remainArgs, 0, remainArgs.length);
    return remainArgs;
  }
}