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.Collections;
  29 import java.util.HashSet;
  30 import java.util.Set;
  31 import java.util.function.Consumer;
  32 import jdk.nashorn.api.scripting.AbstractJSObject;
  33 import jdk.nashorn.internal.runtime.JSType;
  34 import static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED;
  35 
  36 /*
  37  * "edit" top level script function which shows an external Window
  38  * for editing and evaluating scripts from it.
  39  */
  40 final class EditObject extends AbstractJSObject {
  41     private static final Set<String> props;
  42     static {
  43         final HashSet<String> s = new HashSet<>();
  44         s.add("editor");
  45         props = Collections.unmodifiableSet(s);
  46     }
  47 
  48     private final Consumer<String> errorHandler;
  49     private final Consumer<String> evaluator;
  50     private final Console console;
  51     private String editor;
  52 
  53     EditObject(final Consumer<String> errorHandler, final Consumer<String> evaluator,
  54             final Console console) {
  55         this.errorHandler = errorHandler;
  56         this.evaluator = evaluator;
  57         this.console = console;
  58     }
  59 
  60     @Override
  61     public Object getDefaultValue(final Class<?> hint) {
  62         if (hint == String.class) {
  63             return toString();
  64         }
  65         return UNDEFINED;
  66     }
  67 
  68     @Override
  69     public String toString() {
  70         return "function edit() { [native code] }";
  71     }
  72 
  73     @Override
  74     public Set<String> keySet() {
  75         return props;
  76     }
  77 
  78     @Override
  79     public Object getMember(final String name) {
  80         if (name.equals("editor")) {
  81             return editor;
  82         }
  83         return UNDEFINED;
  84     }
  85 
  86     @Override
  87     public void setMember(final String name, final Object value) {
  88         if (name.equals("editor")) {
  89             this.editor = JSType.toString(value);
  90         }
  91     }
  92 
  93     // called whenever user 'saves' script in editor
  94     class SaveHandler implements Consumer<String> {
  95          private String lastStr; // last seen code
  96 
  97          SaveHandler(final String str) {
  98              this.lastStr = str;
  99          }
 100 
 101          @Override
 102          public void accept(final String str) {
 103              // ignore repeated save of the same code!
 104              if (! str.equals(lastStr)) {
 105                  this.lastStr = str;
 106                  // evaluate the new code
 107                  evaluator.accept(str);
 108              }
 109          }
 110     }
 111 
 112     @Override
 113     public Object call(final Object thiz, final Object... args) {
 114         final String initText = args.length > 0? JSType.toString(args[0]) : "";
 115         final SaveHandler saveHandler = new SaveHandler(initText);
 116         if (editor != null && !editor.isEmpty()) {
 117             ExternalEditor.edit(editor, errorHandler, initText, saveHandler, console);
 118         } else {
 119             EditPad.edit(errorHandler, initText, saveHandler);
 120         }
 121         return UNDEFINED;
 122     }
 123 
 124     @Override
 125     public boolean isFunction() {
 126         return true;
 127     }
 128 }