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[phpeclipse.git] / net.sourceforge.phpeclipse / src / net / sourceforge / phpdt / internal / ui / text / template / preferences / TemplateVariableProcessor.java

diff --git a/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/text/template/preferences/TemplateVariableProcessor.java b/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/text/template/preferences/TemplateVariableProcessor.java
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+++ b/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/text/template/preferences/TemplateVariableProcessor.java
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+/*******************************************************************************
+ * Copyright (c) 2000, 2004 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials 
+ * are made available under the terms of the Common Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ * 
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+package net.sourceforge.phpdt.internal.ui.text.template.preferences;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.Iterator;
+import java.util.List;
+
+import org.eclipse.jface.text.ITextViewer;
+import org.eclipse.jface.text.contentassist.ICompletionProposal;
+import org.eclipse.jface.text.contentassist.IContentAssistProcessor;
+import org.eclipse.jface.text.contentassist.IContextInformation;
+import org.eclipse.jface.text.contentassist.IContextInformationValidator;
+import org.eclipse.jface.text.templates.TemplateContextType;
+import org.eclipse.jface.text.templates.TemplateVariableResolver;
+
+
+
+public class TemplateVariableProcessor implements IContentAssistProcessor {    
+
+       private static Comparator fgTemplateVariableProposalComparator= new Comparator() {
+               public int compare(Object arg0, Object arg1) {
+                       TemplateVariableProposal proposal0= (TemplateVariableProposal) arg0;
+                       TemplateVariableProposal proposal1= (TemplateVariableProposal) arg1;
+                       
+                       return proposal0.getDisplayString().compareTo(proposal1.getDisplayString());
+               }
+
+               public boolean equals(Object arg0) {
+                       return false;
+               }
+       };
+
+       
+       /** the context type */
+       private TemplateContextType fContextType;
+       
+       /**
+        * Sets the context type.
+        */
+       public void setContextType(TemplateContextType contextType) {
+               fContextType= contextType;      
+       }
+       
+       /**
+        * Gets the context type.
+        */
+       public TemplateContextType getContextType() {
+               return fContextType;    
+       }       
+       
+       /*
+        * @see IContentAssistProcessor#computeCompletionProposals(ITextViewer, int)
+        */
+       public ICompletionProposal[] computeCompletionProposals(ITextViewer viewer,     int documentOffset) {
+
+               if (fContextType == null)
+                       return null;
+
+               List proposals= new ArrayList();                
+               
+               String text= viewer.getDocument().get();
+               int start= getStart(text, documentOffset);
+               int end= documentOffset;
+
+               String string= text.substring(start, end);
+               String prefix= (string.length() >= 2)
+                       ? string.substring(2)
+                       : null;
+
+               int offset= start;
+               int length= end - start;
+
+               for (Iterator iterator= fContextType.resolvers(); iterator.hasNext(); ) {
+                       TemplateVariableResolver variable= (TemplateVariableResolver) iterator.next();
+
+                       if (prefix == null || variable.getType().startsWith(prefix))
+                               proposals.add(new TemplateVariableProposal(variable, offset, length, viewer));
+               }
+
+               Collections.sort(proposals, fgTemplateVariableProposalComparator);
+               return (ICompletionProposal[]) proposals.toArray(new ICompletionProposal[proposals.size()]);
+       }
+
+       /* Guesses the start position of the completion */
+       private int getStart(String string, int end) {
+               int start= end;
+
+               if (start >= 1 && string.charAt(start - 1) == '$')
+                       return start - 1;
+                               
+               while ((start != 0) && Character.isUnicodeIdentifierPart(string.charAt(start - 1)))
+                       start--;
+
+               if (start >= 2 && string.charAt(start - 1) == '{' && string.charAt(start - 2) == '$')
+                       return start - 2;
+                       
+               return end;
+       }
+
+       /*
+        * @see IContentAssistProcessor#computeContextInformation(ITextViewer, int)
+        */
+       public IContextInformation[] computeContextInformation(ITextViewer viewer, int documentOffset) {
+               return null;
+       }
+
+       /*
+        * @see IContentAssistProcessor#getCompletionProposalAutoActivationCharacters()
+        */
+       public char[] getCompletionProposalAutoActivationCharacters() {
+               return new char[] {'$'};
+       }
+
+       /*
+        * @see IContentAssistProcessor#getContextInformationAutoActivationCharacters()
+        */
+       public char[] getContextInformationAutoActivationCharacters() {
+               return null;
+       }
+
+       /*
+        * @see IContentAssistProcessor#getErrorMessage()
+        */
+       public String getErrorMessage() {
+               return null;
+       }
+
+       /*
+        * @see IContentAssistProcessor#getContextInformationValidator()
+        */
+       public IContextInformationValidator getContextInformationValidator() {
+               return null;
+       }
+
+}
+