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// * distributed with this work for additional information regarding copyright ownership.  The ASF licenses this file        *
// * to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance            *
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// *                                                                                                                         *
// *  http://www.apache.org/licenses/LICENSE-2.0                                                                             *
// *                                                                                                                         *
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package org.apache.juneau.examples.core.svl;

import org.apache.juneau.svl.*;

/**
 * TODO.
 *
 * <ul class='seealso'>
 *    <li class='extlink'>{@source}
 * </ul>
 */
public class SvlExample {

   /**
    * Main method.
    *
    * @param args Unused.
    */
   public static void main(String[] args) {

      VarResolver vr = VarResolver.DEFAULT;

      // $E{key[,default]} for getting environment variables
      System.out.println(vr.resolve("JAVA_HOME=$E{JAVA_HOME, not defined}"));

      // $S{key[,default]} for getting system properties (uses System.getProperty() )
      System.out.println(vr.resolve("os.name=$S{os.name, not defined}"));

      // $IF{key[,default]} general if or if-else condition
      // $NE{arg} will return true if not empty
      System.out.println(vr.resolve("TEST_VAR is $IF{$NE{$E{TEST_VAR}}, not empty, empty}"));

      // $SW{arg,pattern1:then1[,pattern2:then2...]} switch-case
      System.out.println(vr.resolve("$SW{Carrot, *Ap*:Fruit, *Car*:Veg, *:N/A}"));

      // $PR{arg,pattern,replace} pattern replace
      System.out.println(vr.resolve("Java version=$PR{$S{java.version}, (_([0-9]+)), \\ build=\\$2}"));

      // $UC{arg} uppercase $LC{arg} lowecase
      System.out.println(vr.resolve("$LC{JAVA_HOME} $UC{$E{JAVA_HOME}}"));

      // $LN{arg[,delimiter]} length var example
      System.out.println(vr.resolve("parts = $LN{$S{os.version},.}, charcount = $LN{$S{os.version}}"));

      // $ST{arg,start[,end]} substring var example
      System.out.println(vr.resolve("version = $ST{$S{java.version}, 0, 3}"));

      // $PE{arg,start[,end]} pattern extractor var example
      System.out.println(vr.resolve("update = $PE{$S{java.version},_([0-9]+),1}"));

      /*
       *  See all supported variable types at,
       *  http://juneau.apache.org/site/apidocs-8.0.0/overview-summary.html#juneau-marshall.SimpleVariableLanguage
       *  NOTE - juneau-marshall.SimpleVariableLanguage supports nested variables well
       * */
   }

}