Added PHPUnitEditor and corresponding PHPPreferencePage

[phpeclipse.git] / net.sourceforge.phpeclipse / src / net / sourceforge / phpdt / internal / ui / text / BufferedDocumentScanner.java

diff --git a/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/text/BufferedDocumentScanner.java b/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/text/BufferedDocumentScanner.java
new file mode 100644 (file)
index 0000000..26116e0
--- /dev/null
+++ b/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/text/BufferedDocumentScanner.java
@@ -0,0 +1,151 @@
+package net.sourceforge.phpdt.internal.ui.text;
+
+/*
+ * (c) Copyright IBM Corp. 2000, 2001.
+ * All Rights Reserved.
+ */
+
+import org.eclipse.jface.text.BadLocationException;
+import org.eclipse.jface.text.IDocument;
+import org.eclipse.jface.text.rules.ICharacterScanner;
+import org.eclipse.jface.util.Assert;
+
+
+
+/**
+ * A buffered document scanner. The buffer always contains a section 
+ * of a fixed size of the document to be scanned.
+ */
+
+public final class BufferedDocumentScanner implements ICharacterScanner {
+
+       /** The document being scanned. */
+       private IDocument fDocument;
+       /** The offset of the document range to scan. */
+       private int fRangeOffset;
+       /** The length of the document range to scan. */
+       private int fRangeLength;
+       /** The delimiters of the document. */
+       private char[][] fDelimiters;
+
+       /** The buffer. */
+       private final char[] fBuffer;
+       /** The offset of the buffer within the document. */
+       private int fBufferOffset;
+       /** The valid length of the buffer for access. */
+       private int fBufferLength;
+       /** The offset of the scanner within the buffer. */
+       private int fOffset;
+
+       
+       /**
+        * Creates a new buffered document scanner.
+        * The buffer size is set to the given number of characters.
+        * 
+        * @param size the buffer size
+        */
+       public BufferedDocumentScanner(int size) {
+               Assert.isTrue(size >= 1);
+               fBuffer= new char[size];
+       }
+
+       /**
+        * Fills the buffer with the contens of the document starting at the given offset.
+        *
+        * @param offset the document offset at which the buffer starts
+        */
+       private final void updateBuffer(int offset) {
+
+               fBufferOffset= offset;
+               
+               if (fBufferOffset + fBuffer.length > fRangeOffset + fRangeLength)
+                       fBufferLength= fRangeLength - (fBufferOffset - fRangeOffset);
+               else
+                       fBufferLength= fBuffer.length;
+
+               try {
+                       final String content= fDocument.get(fBufferOffset, fBufferLength);
+                       content.getChars(0, fBufferLength, fBuffer, 0);
+               } catch (BadLocationException e) {
+               }
+       }
+
+       /**
+        * Configures the scanner by providing access to the document range over which to scan.
+        *
+        * @param document the document to scan
+        * @param offset the offset of the document range to scan
+        * @param length the length of the document range to scan
+        */
+       public final void setRange(IDocument document, int offset, int length) {
+
+               fDocument= document;
+               fRangeOffset= offset;
+               fRangeLength= length;
+
+               String[] delimiters= document.getLegalLineDelimiters();
+               fDelimiters= new char[delimiters.length][];
+               for (int i= 0; i < delimiters.length; i++)
+                       fDelimiters[i]= delimiters[i].toCharArray();
+
+               updateBuffer(offset);
+               fOffset= 0;
+       }
+
+       /*
+        * @see ICharacterScanner#read()
+        */
+       public final int read() {
+
+               if (fOffset == fBufferLength) {
+                       if (fBufferOffset + fBufferLength == fDocument.getLength())
+                               return EOF;
+                       else {
+                               updateBuffer(fBufferOffset + fBufferLength);
+                               fOffset= 0;
+                       }
+               }
+
+               return fBuffer[fOffset++];
+       }
+
+       /*
+        * @see ICharacterScanner#unread
+        */
+       public final void unread() {
+
+               if (fOffset == 0) {
+                       if (fBufferOffset == fRangeOffset) {
+                               // error: BOF
+                       } else {
+                               updateBuffer(fBufferOffset - fBuffer.length);
+                               fOffset= fBuffer.length - 1;
+                       }
+               } else {                        
+                       --fOffset;
+               }
+       }
+
+       /*
+        * @see ICharacterScanner#getColumn()
+        */
+       public final int getColumn() {
+
+               try {
+                       final int offset= fBufferOffset + fOffset;
+                       final int line= fDocument.getLineOfOffset(offset);
+                       final int start= fDocument.getLineOffset(line);
+                       return offset - start;
+               } catch (BadLocationException e) {
+               }
+
+               return -1;
+       }
+
+       /*
+        * @see ICharacterScanner#getLegalLineDelimiters()
+        */
+       public final char[][] getLegalLineDelimiters() {
+               return fDelimiters;
+       }
+}
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