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   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2004 IBM Corporation and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v10.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  *******************************************************************************/
  11 package net.sourceforge.phpdt.internal.ui.text.template.contentassist;
  12
  13 import java.util.ArrayList;
  14 import java.util.Iterator;
  15 import java.util.List;
  16
  17 import org.eclipse.swt.graphics.Image;
  18 import org.eclipse.swt.graphics.Point;
  19
  20 import org.eclipse.jface.text.Assert;
  21 import org.eclipse.jface.text.BadLocationException;
  22 import org.eclipse.jface.text.DocumentEvent;
  23 import org.eclipse.jface.text.IDocument;
  24 import org.eclipse.jface.text.ITextViewer;
  25 import org.eclipse.jface.text.contentassist.ICompletionProposal;
  26 import org.eclipse.jface.text.contentassist.ICompletionProposalExtension2;
  27 import org.eclipse.jface.text.contentassist.IContextInformation;
  28
  29
  30 /**
  31  * Global state for templates. Selecting a proposal for the master template variable
  32  * will cause the value (and the proposals) for the slave variables to change.
  33  *
  34  * @see MultiVariable
  35  */
  36 public class MultiVariableGuess {
  37
  38         /**
  39          * Implementation of the <code>ICompletionProposal</code> interface and extension.
  40          */
  41         class Proposal implements ICompletionProposal, ICompletionProposalExtension2 {
  42
  43                 /** The string to be displayed in the completion proposal popup */
  44                 private String fDisplayString;
  45                 /** The replacement string */
  46                 String fReplacementString;
  47                 /** The replacement offset */
  48                 private int fReplacementOffset;
  49                 /** The replacement length */
  50                 private int fReplacementLength;
  51                 /** The cursor position after this proposal has been applied */
  52                 private int fCursorPosition;
  53                 /** The image to be displayed in the completion proposal popup */
  54                 private Image fImage;
  55                 /** The context information of this proposal */
  56                 private IContextInformation fContextInformation;
  57                 /** The additional info of this proposal */
  58                 private String fAdditionalProposalInfo;
  59
  60                 /**
  61                  * Creates a new completion proposal based on the provided information.  The replacement string is
  62                  * considered being the display string too. All remaining fields are set to <code>null</code>.
  63                  *
  64                  * @param replacementString the actual string to be inserted into the document
  65                  * @param replacementOffset the offset of the text to be replaced
  66                  * @param replacementLength the length of the text to be replaced
  67                  * @param cursorPosition the position of the cursor following the insert relative to replacementOffset
  68                  */
  69                 public Proposal(String replacementString, int replacementOffset, int replacementLength, int cursorPosition) {
  70                         this(replacementString, replacementOffset, replacementLength, cursorPosition, null, null, null, null);
  71                 }
  72
  73                 /**
  74                  * Creates a new completion proposal. All fields are initialized based on the provided information.
  75                  *
  76                  * @param replacementString the actual string to be inserted into the document
  77                  * @param replacementOffset the offset of the text to be replaced
  78                  * @param replacementLength the length of the text to be replaced
  79                  * @param cursorPosition the position of the cursor following the insert relative to replacementOffset
  80                  * @param image the image to display for this proposal
  81                  * @param displayString the string to be displayed for the proposal
  82                  * @param contextInformation the context information associated with this proposal
  83                  * @param additionalProposalInfo the additional information associated with this proposal
  84                  */
  85                 public Proposal(String replacementString, int replacementOffset, int replacementLength, int cursorPosition, Image image, String displayString, IContextInformation contextInformation, String additionalProposalInfo) {
  86                         Assert.isNotNull(replacementString);
  87                         Assert.isTrue(replacementOffset >= 0);
  88                         Assert.isTrue(replacementLength >= 0);
  89                         Assert.isTrue(cursorPosition >= 0);
  90
  91                         fReplacementString= replacementString;
  92                         fReplacementOffset= replacementOffset;
  93                         fReplacementLength= replacementLength;
  94                         fCursorPosition= cursorPosition;
  95                         fImage= image;
  96                         fDisplayString= displayString;
  97                         fContextInformation= contextInformation;
  98                         fAdditionalProposalInfo= additionalProposalInfo;
  99                 }
 100
 101                 /*
 102                  * @see ICompletionProposal#apply(IDocument)
 103                  */
 104                 public void apply(IDocument document) {
 105                         try {
 106                                 document.replace(fReplacementOffset, fReplacementLength, fReplacementString);
 107                         } catch (BadLocationException x) {
 108                                 // ignore
 109                         }
 110                 }
 111
 112                 /*
 113                  * @see ICompletionProposal#getSelection(IDocument)
 114                  */
 115                 public Point getSelection(IDocument document) {
 116                         return new Point(fReplacementOffset + fCursorPosition, 0);
 117                 }
 118
 119                 /*
 120                  * @see ICompletionProposal#getContextInformation()
 121                  */
 122                 public IContextInformation getContextInformation() {
 123                         return fContextInformation;
 124                 }
 125
 126                 /*
 127                  * @see ICompletionProposal#getImage()
 128                  */
 129                 public Image getImage() {
 130                         return fImage;
 131                 }
 132
 133                 /*
 134                  * @see ICompletionProposal#getDisplayString()
 135                  */
 136                 public String getDisplayString() {
 137                         if (fDisplayString != null)
 138                                 return fDisplayString;
 139                         return fReplacementString;
 140                 }
 141
 142                 /*
 143                  * @see ICompletionProposal#getAdditionalProposalInfo()
 144                  */
 145                 public String getAdditionalProposalInfo() {
 146                         return fAdditionalProposalInfo;
 147                 }
 148
 149                 /*
 150                  * @see org.eclipse.jface.text.contentassist.ICompletionProposalExtension2#apply(org.eclipse.jface.text.ITextViewer, char, int, int)
 151                  */
 152                 public void apply(ITextViewer viewer, char trigger, int stateMask, int offset) {
 153                         apply(viewer.getDocument());
 154                 }
 155
 156                 /*
 157                  * @see org.eclipse.jface.text.contentassist.ICompletionProposalExtension2#selected(org.eclipse.jface.text.ITextViewer, boolean)
 158                  */
 159                 public void selected(ITextViewer viewer, boolean smartToggle) {
 160                 }
 161
 162                 /*
 163                  * @see org.eclipse.jface.text.contentassist.ICompletionProposalExtension2#unselected(org.eclipse.jface.text.ITextViewer)
 164                  */
 165                 public void unselected(ITextViewer viewer) {
 166                 }
 167
 168                 /*
 169                  * @see org.eclipse.jface.text.contentassist.ICompletionProposalExtension2#validate(org.eclipse.jface.text.IDocument, int, org.eclipse.jface.text.DocumentEvent)
 170                  */
 171                 public boolean validate(IDocument document, int offset, DocumentEvent event) {
 172                         try {
 173                                 String content= document.get(fReplacementOffset, fReplacementLength);
 174                                 if (content.startsWith(fReplacementString))
 175                                         return true;
 176                         } catch (BadLocationException e) {
 177                                 // ignore concurrently modified document
 178                         }
 179                         return false;
 180                 }
 181         }
 182
 183         private final List fSlaves= new ArrayList();
 184
 185         private MultiVariable fMaster;
 186
 187         /**
 188          * @param mv
 189          */
 190         public MultiVariableGuess(MultiVariable mv) {
 191                 fMaster= mv;
 192         }
 193
 194         /**
 195          * @param variable
 196          * @return
 197          */
 198         public ICompletionProposal[] getProposals(MultiVariable variable, int offset, int length) {
 199                 if (variable.equals(fMaster)) {
 200                         String[] choices= variable.getValues();
 201
 202                         ICompletionProposal[] ret= new ICompletionProposal[choices.length];
 203                         for (int i= 0; i < ret.length; i++) {
 204                                 ret[i]= new Proposal(choices[i], offset, length, offset + length) {
 205
 206                                         /*
 207                                          * @see org.eclipse.jface.text.link.MultiVariableGuess.Proposal#apply(org.eclipse.jface.text.IDocument)
 208                                          */
 209                                         public void apply(IDocument document) {
 210                                                 super.apply(document);
 211
 212                                                 try {
 213                                                         Object old= fMaster.getSet();
 214                                                         fMaster.setSet(fReplacementString);
 215                                                         if (!fReplacementString.equals(old)) {
 216                                                                 for (Iterator it= fSlaves.iterator(); it.hasNext();) {
 217                                                                         VariablePosition pos= (VariablePosition) it.next();
 218                                                                         String[] values= pos.getVariable().getValues(fReplacementString);
 219                                                                         if (values != null)
 220                                                                                 document.replace(pos.getOffset(), pos.getLength(), values[0]);
 221                                                                 }
 222                                                         }
 223                                                 } catch (BadLocationException e) {
 224                                                         // ignore and continue
 225                                                 }
 226
 227                                         }
 228                                 };
 229                         }
 230
 231                         return ret;
 232
 233                 } else {
 234
 235                         String[] choices= variable.getValues(fMaster.getSet());
 236
 237                         if (choices == null || choices.length < 2)
 238                                 return null;
 239
 240                         ICompletionProposal[] ret= new ICompletionProposal[choices.length];
 241                         for (int i= 0; i < ret.length; i++) {
 242                                 ret[i]= new Proposal(choices[i], offset, length, offset + length);
 243                         }
 244
 245                         return ret;
 246                 }
 247         }
 248
 249         /**
 250          * @param position
 251          */
 252         public void addSlave(VariablePosition position) {
 253                 fSlaves.add(position);
 254         }
 255
 256 }