1 /*
   2  * Copyright (c) 2015, 2017, 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 java.util.ServiceLoader;
  33 import jdk.nashorn.api.scripting.AbstractJSObject;
  34 import jdk.internal.editor.spi.BuildInEditorProvider;
  35 import jdk.nashorn.internal.runtime.JSType;
  36 import static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED;
  37 
  38 /*
  39  * "edit" top level script function which shows an external Window
  40  * for editing and evaluating scripts from it.
  41  */
  42 final class EditObject extends AbstractJSObject {
  43     private static final Set<String> props;
  44     static {
  45         final HashSet<String> s = new HashSet<>();
  46         s.add("editor");
  47         props = Collections.unmodifiableSet(s);
  48     }
  49 
  50     private final Console console;
  51     private final Consumer<String> errorHandler;
  52     private final Consumer<String> evaluator;
  53     private String editor;
  54 
  55     EditObject(final Console console, final Consumer<String> errorHandler,
  56             final Consumer<String> evaluator) {
  57         this.console = console;
  58         this.errorHandler = errorHandler;
  59         this.evaluator = evaluator;
  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 "function edit() { [native code] }";
  73     }
  74 
  75     @Override
  76     public Set<String> keySet() {
  77         return props;
  78     }
  79 
  80     @Override
  81     public Object getMember(final String name) {
  82         if (name.equals("editor")) {
  83             return editor;
  84         }
  85         return UNDEFINED;
  86     }
  87 
  88     @Override
  89     public void setMember(final String name, final Object value) {
  90         if (name.equals("editor")) {
  91             this.editor = value != null && value != UNDEFINED? JSType.toString(value) : "";
  92         }
  93     }
  94 
  95     // called whenever user 'saves' script in editor
  96     class SaveHandler implements Consumer<String> {
  97          private String lastStr; // last seen code
  98 
  99          SaveHandler(final String str) {
 100              this.lastStr = str;
 101          }
 102 
 103          @Override
 104          public void accept(final String str) {
 105              // ignore repeated save of the same code!
 106              if (! str.equals(lastStr)) {
 107                  this.lastStr = str;
 108                  // evaluate the new code
 109                  evaluator.accept(str);
 110              }
 111          }
 112     }
 113 
 114     @Override
 115     public Object call(final Object thiz, final Object... args) {
 116         final String initText = args.length > 0? JSType.toString(args[0]) : "";
 117         final SaveHandler saveHandler = new SaveHandler(initText);
 118         if (editor != null && !editor.isEmpty()) {
 119             ExternalEditor.edit(editor, errorHandler, initText, saveHandler, console);
 120         } else if (! Main.HEADLESS) {
 121             try {
 122                 ServiceLoader<BuildInEditorProvider> sl
 123                         = ServiceLoader.load(BuildInEditorProvider.class);
 124                 //find the highest ranking provider
 125                 BuildInEditorProvider provider = null;
 126                 for (BuildInEditorProvider p : sl){
 127                     if (provider == null || p.rank() > provider.rank()) {
 128                         provider = p;
 129                     }
 130                 }
 131                 if (provider != null) {
 132                     provider.edit(null, initText, saveHandler, errorHandler);
 133                 } else {
 134                     errorHandler.accept(Main.getMessage("jjs.err.no.builtin.editor"));
 135                 }
 136             } catch (RuntimeException ex) {
 137                 errorHandler.accept(Main.getMessage("jjs.err.cant.launch.editor"));
 138             }
 139         } else {
 140             errorHandler.accept(Main.getMessage("no.editor"));
 141         }
 142         return UNDEFINED;
 143     }
 144 
 145     @Override
 146     public boolean isFunction() {
 147         return true;
 148     }
 149 }