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.util.function.Consumer;
  29 import jdk.nashorn.api.scripting.AbstractJSObject;
  30 import jdk.nashorn.internal.runtime.JSType;
  31 import static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED;
  32 
  33 /*
  34  * "edit" top level script function which shows an external Window
  35  * for editing and evaluating scripts from it.
  36  */
  37 final class EditObject extends AbstractJSObject {
  38     private final Consumer<String> errorHandler;
  39     private final Consumer<String> evaluator;
  40     private final Console console;
  41     private String editor;
  42 
  43     EditObject(final Consumer<String> errorHandler, final Consumer<String> evaluator,
  44             final Console console) {
  45         this.errorHandler = errorHandler;
  46         this.evaluator = evaluator;
  47         this.console = console;
  48     }
  49 
  50     @Override
  51     public Object getDefaultValue(final Class<?> hint) {
  52         if (hint == String.class) {
  53             return toString();
  54         }
  55         return UNDEFINED;
  56     }
  57 
  58     @Override
  59     public String toString() {
  60         return "function edit() { [native code] }";
  61     }
  62 
  63     @Override
  64     public Object getMember(final String name) {
  65         if (name.equals("editor")) {
  66             return editor;
  67         }
  68         return UNDEFINED;
  69     }
  70 
  71     @Override
  72     public void setMember(final String name, final Object value) {
  73         if (name.equals("editor")) {
  74             this.editor = JSType.toString(value);
  75         }
  76     }
  77 
  78     // called whenever user 'saves' script in editor
  79     class SaveHandler implements Consumer<String> {
  80          private String lastStr; // last seen code
  81 
  82          SaveHandler(final String str) {
  83              this.lastStr = str;
  84          }
  85 
  86          @Override
  87          public void accept(final String str) {
  88              // ignore repeated save of the same code!
  89              if (! str.equals(lastStr)) {
  90                  this.lastStr = str;
  91                  // evaluate the new code
  92                  evaluator.accept(str);
  93              }
  94          }
  95     }
  96 
  97     @Override
  98     public Object call(final Object thiz, final Object... args) {
  99         final String initText = args.length > 0? JSType.toString(args[0]) : "";
 100         final SaveHandler saveHandler = new SaveHandler(initText);
 101         if (editor != null && !editor.isEmpty()) {
 102             ExternalEditor.edit(editor, errorHandler, initText, saveHandler, console);
 103         } else {
 104             EditPad.edit(errorHandler, initText, saveHandler);
 105         }
 106         return UNDEFINED;
 107     }
 108 
 109     @Override
 110     public boolean isFunction() {
 111         return true;
 112     }
 113 }