1 /*
   2  * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package jdk.nashorn.tools.jjs;
  27 
  28 import java.io.IOException;
  29 import java.util.function.Function;
  30 import jdk.internal.jline.console.history.FileHistory;
  31 import jdk.internal.jline.console.history.History;
  32 import jdk.nashorn.api.scripting.AbstractJSObject;
  33 import jdk.nashorn.api.scripting.JSObject;
  34 import jdk.nashorn.internal.runtime.JSType;
  35 import static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED;
  36 
  37 /*
  38  * A script friendly object that exposes history of commands to scripts.
  39  */
  40 final class HistoryObject extends AbstractJSObject {
  41     private final FileHistory hist;
  42 
  43     HistoryObject(final FileHistory hist) {
  44         this.hist = hist;
  45     }
  46 
  47     @Override
  48     public Object getMember(final String name) {
  49         switch (name) {
  50             case "clear":
  51                 return (Runnable)hist::clear;
  52             case "forEach":
  53                 return (Function<JSObject, Object>)this::iterate;
  54             case "print":
  55                 return (Runnable)this::print;
  56             case "size":
  57                 return hist.size();
  58         }
  59         return UNDEFINED;
  60     }
  61 
  62     @Override
  63     public Object getDefaultValue(final Class<?> hint) {
  64         if (hint == String.class) {
  65             return toString();
  66         }
  67         return UNDEFINED;
  68     }
  69 
  70     @Override
  71     public String toString() {
  72         return "[object history]";
  73     }
  74 
  75     private void print() {
  76         for (History.Entry e : hist) {
  77             System.out.println(e.value());
  78         }
  79     }
  80 
  81     private Object iterate(final JSObject func) {
  82         for (History.Entry e : hist) {
  83             if (JSType.toBoolean(func.call(this, e.value().toString()))) {
  84                 break; // return true from callback to skip iteration
  85             }
  86         }
  87         return UNDEFINED;
  88     }
  89 }