net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/text/template/IdentifierEngine.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 java.util.ArrayList;
   8
   9 import net.sourceforge.phpdt.core.ICompilationUnit;
  10 import net.sourceforge.phpdt.internal.corext.template.php.CompilationUnitContextType;
  11 import net.sourceforge.phpdt.internal.corext.template.php.JavaContext;
  12 import net.sourceforge.phpdt.internal.corext.template.php.JavaContextType;
  13 import net.sourceforge.phpdt.internal.ui.PHPUiImages;
  14 import net.sourceforge.phpdt.internal.ui.text.java.IPHPCompletionProposal;
  15 import net.sourceforge.phpeclipse.PHPeclipsePlugin;
  16
  17 import org.eclipse.jface.text.BadLocationException;
  18 import org.eclipse.jface.text.IDocument;
  19 import org.eclipse.jface.text.IRegion;
  20 import org.eclipse.jface.text.ITextViewer;
  21 import org.eclipse.jface.text.Region;
  22 import org.eclipse.swt.graphics.Point;
  23
  24 public class IdentifierEngine {
  25
  26         /** The context type. */
  27         private JavaContextType fContextType;
  28
  29         /** The result proposals. */
  30         private ArrayList fProposals = new ArrayList();
  31
  32         /**
  33          * Creates the template engine for a particular context type. See
  34          * <code>TemplateContext</code> for supported context types.
  35          */
  36         public IdentifierEngine(JavaContextType contextType) {
  37                 // Assert.isNotNull(contextType);
  38                 fContextType = contextType;
  39         }
  40
  41         /**
  42          * Empties the collector.
  43          *
  44          * @param viewer
  45          *            the text viewer
  46          * @param unit
  47          *            the compilation unit (may be <code>null</code>)
  48          */
  49         public void reset() {
  50                 fProposals.clear();
  51         }
  52
  53         /**
  54          * Returns the array of matching templates.
  55          */
  56         public IPHPCompletionProposal[] getResults() {
  57                 return (IPHPCompletionProposal[]) fProposals
  58                                 .toArray(new IPHPCompletionProposal[fProposals.size()]);
  59         }
  60
  61         /**
  62          * Inspects the context of the compilation unit around
  63          * <code>completionPosition</code> and feeds the collector with proposals.
  64          *
  65          * @param viewer
  66          *            the text viewer
  67          * @param completionPosition
  68          *            the context position in the document of the text viewer
  69          * @param compilationUnit
  70          *            the compilation unit (may be <code>null</code>)
  71          */
  72         public void complete(ITextViewer viewer, int completionPosition,
  73                         Object[] identifiers, ICompilationUnit compilationUnit)
  74         // hrows JavaModelException
  75         {
  76                 IDocument document = viewer.getDocument();
  77
  78                 if (!(fContextType instanceof CompilationUnitContextType))
  79                         return;
  80
  81                 Point selection = viewer.getSelectedRange();
  82                 // remember selected text
  83                 String selectedText = null;
  84                 if (selection.y != 0) {
  85                         try {
  86                                 selectedText = document.get(selection.x, selection.y);
  87                         } catch (BadLocationException e) {
  88                         }
  89                 }
  90
  91                 // ((CompilationUnitContextType)
  92                 // fContextType).setContextParameters(document, completionPosition,
  93                 // selection.y); //mpilationUnit);
  94
  95                 // JavaContext context = (JavaContext) fContextType.createContext();
  96                 JavaContext context = (JavaContext) fContextType.createContext(
  97                                 document, completionPosition, selection.y, compilationUnit);
  98                 context.setVariable("selection", selectedText); //$NON-NLS-1$
  99
 100                 int start = context.getStart();
 101                 int end = context.getEnd();
 102                 IRegion region = new Region(start, end - start);
 103
 104                 // Template[] templates= Templates.getInstance().getTemplates();
 105                 String identifier = null;
 106                 int maxProposals = PHPeclipsePlugin.MAX_PROPOSALS;
 107
 108                 for (int i = 0; i != identifiers.length; i++) {
 109                         identifier = (String) identifiers[i];
 110                         if (context.canEvaluate(identifier)) {
 111                                 if (maxProposals-- < 0) {
 112                                         return;
 113                                 }
 114                                 fProposals.add(new IdentifierProposal(identifier, context,
 115                                                 region, viewer, PHPUiImages.get(PHPUiImages.IMG_FUN),
 116                                                 PHPUiImages.get(PHPUiImages.IMG_VAR)));
 117                         }
 118                 }
 119         }
 120
 121 }