X-Git-Url: http://secure.phpeclipse.com

diff --git a/net.sourceforge.phpeclipse.ui/src/net/sourceforge/phpdt/internal/ui/text/SequenceCharacterIterator.java b/net.sourceforge.phpeclipse.ui/src/net/sourceforge/phpdt/internal/ui/text/SequenceCharacterIterator.java
new file mode 100644
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--- /dev/null
+++ b/net.sourceforge.phpeclipse.ui/src/net/sourceforge/phpdt/internal/ui/text/SequenceCharacterIterator.java
@@ -0,0 +1,179 @@
+/*******************************************************************************
+ * 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;
+
+import java.text.CharacterIterator;
+
+import org.eclipse.jface.text.Assert;
+
+/**
+ * A <code>CharSequence</code> based implementation of
+ * <code>CharacterIterator</code>.
+ * 
+ * @since 3.0
+ */
+public class SequenceCharacterIterator implements CharacterIterator {
+
+	private int fIndex = -1;
+
+	private final CharSequence fSequence;
+
+	private final int fFirst;
+
+	private final int fLast;
+
+	private void invariant() {
+		Assert.isTrue(fIndex >= fFirst);
+		Assert.isTrue(fIndex <= fLast);
+	}
+
+	/**
+	 * Creates an iterator for the entire sequence.
+	 * 
+	 * @param sequence
+	 *            the sequence backing this iterator
+	 */
+	public SequenceCharacterIterator(CharSequence sequence) {
+		this(sequence, 0);
+	}
+
+	/**
+	 * Creates an iterator.
+	 * 
+	 * @param sequence
+	 *            the sequence backing this iterator
+	 * @param first
+	 *            the first character to consider
+	 * @throws IllegalArgumentException
+	 *             if the indices are out of bounds
+	 */
+	public SequenceCharacterIterator(CharSequence sequence, int first)
+			throws IllegalArgumentException {
+		this(sequence, first, sequence.length());
+	}
+
+	/**
+	 * Creates an iterator.
+	 * 
+	 * @param sequence
+	 *            the sequence backing this iterator
+	 * @param first
+	 *            the first character to consider
+	 * @param last
+	 *            the last character index to consider
+	 * @throws IllegalArgumentException
+	 *             if the indices are out of bounds
+	 */
+	public SequenceCharacterIterator(CharSequence sequence, int first, int last)
+			throws IllegalArgumentException {
+		if (sequence == null)
+			throw new NullPointerException();
+		if (first < 0 || first > last)
+			throw new IllegalArgumentException();
+		if (last > sequence.length())
+			throw new IllegalArgumentException();
+		fSequence = sequence;
+		fFirst = first;
+		fLast = last;
+		fIndex = first;
+		invariant();
+	}
+
+	/*
+	 * @see java.text.CharacterIterator#first()
+	 */
+	public char first() {
+		return setIndex(getBeginIndex());
+	}
+
+	/*
+	 * @see java.text.CharacterIterator#last()
+	 */
+	public char last() {
+		if (fFirst == fLast)
+			return setIndex(getEndIndex());
+		else
+			return setIndex(getEndIndex() - 1);
+	}
+
+	/*
+	 * @see java.text.CharacterIterator#current()
+	 */
+	public char current() {
+		if (fIndex >= fFirst && fIndex < fLast)
+			return fSequence.charAt(fIndex);
+		else
+			return DONE;
+	}
+
+	/*
+	 * @see java.text.CharacterIterator#next()
+	 */
+	public char next() {
+		return setIndex(Math.min(fIndex + 1, getEndIndex()));
+	}
+
+	/*
+	 * @see java.text.CharacterIterator#previous()
+	 */
+	public char previous() {
+		if (fIndex > getBeginIndex()) {
+			return setIndex(fIndex - 1);
+		} else {
+			return DONE;
+		}
+	}
+
+	/*
+	 * @see java.text.CharacterIterator#setIndex(int)
+	 */
+	public char setIndex(int position) {
+		if (position >= getBeginIndex() && position <= getEndIndex())
+			fIndex = position;
+		else
+			throw new IllegalArgumentException();
+
+		invariant();
+		return current();
+	}
+
+	/*
+	 * @see java.text.CharacterIterator#getBeginIndex()
+	 */
+	public int getBeginIndex() {
+		return fFirst;
+	}
+
+	/*
+	 * @see java.text.CharacterIterator#getEndIndex()
+	 */
+	public int getEndIndex() {
+		return fLast;
+	}
+
+	/*
+	 * @see java.text.CharacterIterator#getIndex()
+	 */
+	public int getIndex() {
+		return fIndex;
+	}
+
+	/*
+	 * @see java.text.CharacterIterator#clone()
+	 */
+	public Object clone() {
+		try {
+			return super.clone();
+		} catch (CloneNotSupportedException e) {
+			throw new InternalError();
+		}
+	}
+}