net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/text/template/TemplateProposal.java

   1 /*
   2  * (c) Copyright IBM Corp. 2000, 2001.
   3  * All Rights Reserved.
   4  */
   5 package net.sourceforge.phpdt.internal.ui.text.template;
   6
   7 import net.sourceforge.phpdt.internal.corext.template.Template;
   8 import net.sourceforge.phpdt.internal.corext.template.TemplateBuffer;
   9 import net.sourceforge.phpdt.internal.corext.template.TemplateContext;
  10 import net.sourceforge.phpdt.internal.corext.template.TemplateMessages;
  11 import net.sourceforge.phpdt.internal.corext.template.TemplatePosition;
  12 import net.sourceforge.phpdt.internal.corext.template.java.CompilationUnitContext;
  13 import net.sourceforge.phpdt.internal.corext.template.java.JavaTemplateMessages;
  14 import net.sourceforge.phpdt.internal.ui.text.java.IJavaCompletionProposal;
  15 import net.sourceforge.phpeclipse.PHPeclipsePlugin;
  16 import org.eclipse.core.runtime.CoreException;
  17 import net.sourceforge.phpdt.internal.ui.text.link.LinkedPositionManager;
  18 import net.sourceforge.phpdt.internal.ui.text.link.LinkedPositionUI;
  19 import org.eclipse.jface.dialogs.MessageDialog;
  20 import org.eclipse.jface.text.BadLocationException;
  21 import org.eclipse.jface.text.IDocument;
  22 import org.eclipse.jface.text.IRegion;
  23 import org.eclipse.jface.text.ITextViewer;
  24 import org.eclipse.jface.text.contentassist.IContextInformation;
  25 import org.eclipse.swt.graphics.Image;
  26 import org.eclipse.swt.graphics.Point;
  27 import org.eclipse.swt.widgets.Shell;
  28 //import org.eclipse.jdt.internal.ui.text.link.LinkedPositionManager;
  29 //import org.eclipse.jdt.internal.ui.text.link.LinkedPositionUI;
  30 //import org.eclipse.jdt.internal.ui.util.ExceptionHandler;
  31
  32 /**
  33  * A template proposal.
  34  */
  35 public class TemplateProposal implements IJavaCompletionProposal {
  36
  37         private final Template fTemplate;
  38         private final TemplateContext fContext;
  39         private final ITextViewer fViewer;
  40 //      private final Image fImage;
  41         private final IRegion fRegion;
  42
  43         private TemplateBuffer fTemplateBuffer;
  44         private String fOldText;
  45         private IRegion fSelectedRegion; // initialized by apply()
  46
  47         /**
  48          * Creates a template proposal with a template and its context.
  49          * @param template  the template
  50          * @param context   the context in which the template was requested.
  51          * @param image     the icon of the proposal.
  52          */
  53         public TemplateProposal(Template template, TemplateContext context, IRegion region, ITextViewer viewer){ //, Image image) {
  54 //              Assert.isNotNull(template);
  55 //              Assert.isNotNull(context);
  56 //              Assert.isNotNull(region);
  57 //              Assert.isNotNull(viewer);
  58
  59                 fTemplate= template;
  60                 fContext= context;
  61                 fViewer= viewer;
  62 //              fImage= image;
  63                 fRegion= region;
  64         }
  65
  66         /*
  67          * @see ICompletionProposal#apply(IDocument)
  68          */
  69         public void apply(IDocument document) {
  70             try {
  71                     if (fTemplateBuffer == null)
  72                                 fTemplateBuffer= fContext.evaluate(fTemplate);
  73
  74                         int start= fRegion.getOffset();
  75                         int end= fRegion.getOffset() + fRegion.getLength();
  76
  77                         // insert template string
  78                         String templateString= fTemplateBuffer.getString();
  79                         document.replace(start, end - start, templateString);
  80
  81                         // translate positions
  82                         LinkedPositionManager manager= new LinkedPositionManager(document);
  83                         TemplatePosition[] variables= fTemplateBuffer.getVariables();
  84                         for (int i= 0; i != variables.length; i++) {
  85                                 TemplatePosition variable= variables[i];
  86
  87                                 if (variable.isResolved())
  88                                         continue;
  89
  90                                 int[] offsets= variable.getOffsets();
  91                                 int length= variable.getLength();
  92
  93                                 for (int j= 0; j != offsets.length; j++)
  94                                         manager.addPosition(offsets[j] + start, length);
  95                         }
  96
  97                         LinkedPositionUI editor= new LinkedPositionUI(fViewer, manager);
  98                         editor.setFinalCaretOffset(getCaretOffset(fTemplateBuffer) + start);
  99                         editor.enter();
 100
 101                         fSelectedRegion= editor.getSelectedRegion();
 102
 103                 } catch (BadLocationException e) {
 104                         PHPeclipsePlugin.log(e);
 105                         openErrorDialog(e);
 106
 107             } catch (CoreException e) {
 108                         handleException(e);
 109             }
 110         }
 111
 112         private static int getCaretOffset(TemplateBuffer buffer) {
 113             TemplatePosition[] variables= buffer.getVariables();
 114                 for (int i= 0; i != variables.length; i++) {
 115                         TemplatePosition variable= variables[i];
 116
 117                         if (variable.getName().equals(JavaTemplateMessages.getString("GlobalVariables.variable.name.cursor"))) //$NON-NLS-1$
 118                                 return variable.getOffsets()[0];
 119                 }
 120
 121                 return buffer.getString().length();
 122         }
 123
 124         /*
 125          * @see ICompletionProposal#getSelection(IDocument)
 126          */
 127         public Point getSelection(IDocument document) {
 128                 return new Point(fSelectedRegion.getOffset(), fSelectedRegion.getLength());
 129 //        return null;
 130   }
 131
 132         /*
 133          * @see ICompletionProposal#getAdditionalProposalInfo()
 134          */
 135         public String getAdditionalProposalInfo() {
 136             try {
 137                         if (fTemplateBuffer == null)
 138                                 fTemplateBuffer= fContext.evaluate(fTemplate);
 139
 140                         return textToHTML(fTemplateBuffer.getString());
 141
 142             } catch (CoreException e) {
 143                         handleException(e);
 144                         return null;
 145             }
 146         }
 147
 148         /*
 149          * @see ICompletionProposal#getDisplayString()
 150          */
 151         public String getDisplayString() {
 152                 return fTemplate.getName() + TemplateMessages.getString("TemplateProposal.delimiter") + fTemplate.getDescription(); // $NON-NLS-1$ //$NON-NLS-1$
 153         }
 154
 155         /*
 156          * @see ICompletionProposal#getImage()
 157          */
 158         public Image getImage() {
 159 //              return fImage;
 160      return null;
 161         }
 162
 163         /*
 164          * @see ICompletionProposal#getContextInformation()
 165          */
 166         public IContextInformation getContextInformation() {
 167                 return null;
 168         }
 169
 170         private static String textToHTML(String string) {
 171                 StringBuffer buffer= new StringBuffer(string.length());
 172                 buffer.append("<pre>"); //$NON-NLS-1$
 173
 174                 for (int i= 0; i != string.length(); i++) {
 175                         char ch= string.charAt(i);
 176
 177                         switch (ch) {
 178                                 case '&':
 179                                         buffer.append("&amp;"); //$NON-NLS-1$
 180                                         break;
 181
 182                                 case '<':
 183                                         buffer.append("&lt;"); //$NON-NLS-1$
 184                                         break;
 185
 186                                 case '>':
 187                                         buffer.append("&gt;"); //$NON-NLS-1$
 188                                         break;
 189
 190                                 case '\t':
 191                                         buffer.append("    "); //$NON-NLS-1$
 192                                         break;
 193
 194                                 case '\n':
 195                                         buffer.append("<br>"); //$NON-NLS-1$
 196                                         break;
 197
 198                                 default:
 199                                         buffer.append(ch);
 200                                         break;
 201                         }
 202                 }
 203
 204                 buffer.append("</pre>"); //$NON-NLS-1$
 205                 return buffer.toString();
 206         }
 207
 208         private void openErrorDialog(BadLocationException e) {
 209                 Shell shell= fViewer.getTextWidget().getShell();
 210                 MessageDialog.openError(shell, TemplateMessages.getString("TemplateEvaluator.error.title"), e.getMessage()); //$NON-NLS-1$
 211         }
 212
 213         private void handleException(CoreException e) {
 214                 Shell shell= fViewer.getTextWidget().getShell();
 215     PHPeclipsePlugin.log(e);
 216 //              ExceptionHandler.handle(e, shell, TemplateMessages.getString("TemplateEvaluator.error.title"), null); //$NON-NLS-1$
 217         }
 218
 219         /*
 220          * @see IJavaCompletionProposal#getRelevance()
 221          */
 222         public int getRelevance() {
 223
 224                 if (fContext instanceof CompilationUnitContext) {
 225                         CompilationUnitContext context= (CompilationUnitContext) fContext;
 226                         switch (context.getCharacterBeforeStart()) {
 227                         // high relevance after whitespace
 228                         case ' ':
 229                         case '\r':
 230                         case '\n':
 231                         case '\t':
 232                                 return 90;
 233
 234                         default:
 235                                 return 0;
 236                         }
 237                 } else {
 238                         return 90;
 239                 }
 240         }
 241
 242 }