--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwtx/jface/text/ListLineTracker.d	Sat Aug 23 19:10:48 2008 +0200
@@ -0,0 +1,365 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2006 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ * Port to the D programming language:
+ *     Frank Benoit <benoit@tionex.de>
+ *******************************************************************************/
+module dwtx.jface.text.ListLineTracker;
+
+import dwt.dwthelper.utils;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import dwtx.jface.text.AbstractLineTracker.DelimiterInfo;
+
+/**
+ * Abstract, read-only implementation of <code>ILineTracker</code>. It lets the definition of
+ * line delimiters to subclasses. Assuming that '\n' is the only line delimiter, this abstract
+ * implementation defines the following line scheme:
+ * <ul>
+ * <li> "" -> [0,0]
+ * <li> "a" -> [0,1]
+ * <li> "\n" -> [0,1], [1,0]
+ * <li> "a\n" -> [0,2], [2,0]
+ * <li> "a\nb" -> [0,2], [2,1]
+ * <li> "a\nbc\n" -> [0,2], [2,3], [5,0]
+ * </ul>
+ * This class must be subclassed.
+ * 
+ * @since 3.2
+ */
+abstract class ListLineTracker : ILineTracker {
+
+    /** The line information */
+    private final List fLines= new ArrayList();
+    /** The length of the tracked text */
+    private int fTextLength;
+
+    /**
+     * Creates a new line tracker.
+     */
+    protected ListLineTracker() {
+    }
+
+    /**
+     * Binary search for the line at a given offset.
+     * 
+     * @param offset the offset whose line should be found
+     * @return the line of the offset
+     */
+    private int findLine(int offset) {
+
+        if (fLines.size() is 0)
+            return -1;
+
+        int left= 0;
+        int right= fLines.size() - 1;
+        int mid= 0;
+        Line line= null;
+
+        while (left < right) {
+
+            mid= (left + right) / 2;
+
+            line= (Line) fLines.get(mid);
+            if (offset < line.offset) {
+                if (left is mid)
+                    right= left;
+                else
+                    right= mid - 1;
+            } else if (offset > line.offset) {
+                if (right is mid)
+                    left= right;
+                else
+                    left= mid + 1;
+            } else if (offset is line.offset) {
+                left= right= mid;
+            }
+        }
+
+        line= (Line) fLines.get(left);
+        if (line.offset > offset)
+            --left;
+        return left;
+    }
+
+    /**
+     * Returns the number of lines covered by the specified text range.
+     * 
+     * @param startLine the line where the text range starts
+     * @param offset the start offset of the text range
+     * @param length the length of the text range
+     * @return the number of lines covered by this text range
+     * @exception BadLocationException if range is undefined in this tracker
+     */
+    private int getNumberOfLines(int startLine, int offset, int length) throws BadLocationException {
+
+        if (length is 0)
+            return 1;
+
+        int target= offset + length;
+
+        Line l= (Line) fLines.get(startLine);
+
+        if (l.delimiter is null)
+            return 1;
+
+        if (l.offset + l.length > target)
+            return 1;
+
+        if (l.offset + l.length is target)
+            return 2;
+
+        return getLineNumberOfOffset(target) - startLine + 1;
+    }
+
+    /*
+     * @see dwtx.jface.text.ILineTracker#getLineLength(int)
+     */
+    public final int getLineLength(int line) throws BadLocationException {
+        int lines= fLines.size();
+
+        if (line < 0 || line > lines)
+            throw new BadLocationException();
+
+        if (lines is 0 || lines is line)
+            return 0;
+
+        Line l= (Line) fLines.get(line);
+        return l.length;
+    }
+
+    /*
+     * @see dwtx.jface.text.ILineTracker#getLineNumberOfOffset(int)
+     */
+    public final int getLineNumberOfOffset(int position) throws BadLocationException {
+        if (position < 0 || position > fTextLength)
+            throw new BadLocationException();
+
+        if (position is fTextLength) {
+
+            int lastLine= fLines.size() - 1;
+            if (lastLine < 0)
+                return 0;
+
+            Line l= (Line) fLines.get(lastLine);
+            return (l.delimiter !is null ? lastLine + 1 : lastLine);
+        }
+
+        return findLine(position);
+    }
+
+    /*
+     * @see dwtx.jface.text.ILineTracker#getLineInformationOfOffset(int)
+     */
+    public final IRegion getLineInformationOfOffset(int position) throws BadLocationException {
+        if (position > fTextLength)
+            throw new BadLocationException();
+
+        if (position is fTextLength) {
+            int size= fLines.size();
+            if (size is 0)
+                return new Region(0, 0);
+            Line l= (Line) fLines.get(size - 1);
+            return (l.delimiter !is null ? new Line(fTextLength, 0) : new Line(fTextLength - l.length, l.length));
+        }
+
+        return getLineInformation(findLine(position));
+    }
+
+    /*
+     * @see dwtx.jface.text.ILineTracker#getLineInformation(int)
+     */
+    public final IRegion getLineInformation(int line) throws BadLocationException {
+        int lines= fLines.size();
+
+        if (line < 0 || line > lines)
+            throw new BadLocationException();
+
+        if (lines is 0)
+            return new Line(0, 0);
+
+        if (line is lines) {
+            Line l= (Line) fLines.get(line - 1);
+            return new Line(l.offset + l.length, 0);
+        }
+
+        Line l= (Line) fLines.get(line);
+        return (l.delimiter !is null ? new Line(l.offset, l.length - l.delimiter.length()) : l);
+    }
+
+    /*
+     * @see dwtx.jface.text.ILineTracker#getLineOffset(int)
+     */
+    public final int getLineOffset(int line) throws BadLocationException {
+        int lines= fLines.size();
+
+        if (line < 0 || line > lines)
+            throw new BadLocationException();
+
+        if (lines is 0)
+            return 0;
+
+        if (line is lines) {
+            Line l= (Line) fLines.get(line - 1);
+            if (l.delimiter !is null)
+                return l.offset + l.length;
+            throw new BadLocationException();
+        }
+
+        Line l= (Line) fLines.get(line);
+        return l.offset;
+    }
+
+    /*
+     * @see dwtx.jface.text.ILineTracker#getNumberOfLines()
+     */
+    public final int getNumberOfLines() {
+        int lines= fLines.size();
+
+        if (lines is 0)
+            return 1;
+
+        Line l= (Line) fLines.get(lines - 1);
+        return (l.delimiter !is null ? lines + 1 : lines);
+    }
+
+    /*
+     * @see dwtx.jface.text.ILineTracker#getNumberOfLines(int, int)
+     */
+    public final int getNumberOfLines(int position, int length) throws BadLocationException {
+
+        if (position < 0 || position + length > fTextLength)
+            throw new BadLocationException();
+
+        if (length is 0) // optimization
+            return 1;
+
+        return getNumberOfLines(getLineNumberOfOffset(position), position, length);
+    }
+
+    /*
+     * @see dwtx.jface.text.ILineTracker#computeNumberOfLines(java.lang.String)
+     */
+    public final int computeNumberOfLines(String text) {
+        int count= 0;
+        int start= 0;
+        DelimiterInfo delimiterInfo= nextDelimiterInfo(text, start);
+        while (delimiterInfo !is null && delimiterInfo.delimiterIndex > -1) {
+            ++count;
+            start= delimiterInfo.delimiterIndex + delimiterInfo.delimiterLength;
+            delimiterInfo= nextDelimiterInfo(text, start);
+        }
+        return count;
+    }
+
+    /*
+     * @see dwtx.jface.text.ILineTracker#getLineDelimiter(int)
+     */
+    public final String getLineDelimiter(int line) throws BadLocationException {
+        int lines= fLines.size();
+
+        if (line < 0 || line > lines)
+            throw new BadLocationException();
+
+        if (lines is 0)
+            return null;
+
+        if (line is lines)
+            return null;
+
+        Line l= (Line) fLines.get(line);
+        return l.delimiter;
+    }
+
+    /**
+     * Returns the information about the first delimiter found in the given text starting at the
+     * given offset.
+     * 
+     * @param text the text to be searched
+     * @param offset the offset in the given text
+     * @return the information of the first found delimiter or <code>null</code>
+     */
+    protected abstract DelimiterInfo nextDelimiterInfo(String text, int offset);
+
+    /**
+     * Creates the line structure for the given text. Newly created lines are inserted into the line
+     * structure starting at the given position. Returns the number of newly created lines.
+     * 
+     * @param text the text for which to create a line structure
+     * @param insertPosition the position at which the newly created lines are inserted into the
+     *        tracker's line structure
+     * @param offset the offset of all newly created lines
+     * @return the number of newly created lines
+     */
+    private int createLines(String text, int insertPosition, int offset) {
+
+        int count= 0;
+        int start= 0;
+        DelimiterInfo delimiterInfo= nextDelimiterInfo(text, 0);
+
+        while (delimiterInfo !is null && delimiterInfo.delimiterIndex > -1) {
+
+            int index= delimiterInfo.delimiterIndex + (delimiterInfo.delimiterLength - 1);
+
+            if (insertPosition + count >= fLines.size())
+                fLines.add(new Line(offset + start, offset + index, delimiterInfo.delimiter));
+            else
+                fLines.add(insertPosition + count, new Line(offset + start, offset + index, delimiterInfo.delimiter));
+
+            ++count;
+            start= index + 1;
+            delimiterInfo= nextDelimiterInfo(text, start);
+        }
+
+        if (start < text.length()) {
+            if (insertPosition + count < fLines.size()) {
+                // there is a line below the current
+                Line l= (Line) fLines.get(insertPosition + count);
+                int delta= text.length() - start;
+                l.offset-= delta;
+                l.length+= delta;
+            } else {
+                fLines.add(new Line(offset + start, offset + text.length() - 1, null));
+                ++count;
+            }
+        }
+
+        return count;
+    }
+
+    /*
+     * @see dwtx.jface.text.ILineTracker#replace(int, int, java.lang.String)
+     */
+    public final void replace(int position, int length, String text) throws BadLocationException {
+        throw new UnsupportedOperationException();
+    }
+
+    /*
+     * @see dwtx.jface.text.ILineTracker#set(java.lang.String)
+     */
+    public final void set(String text) {
+        fLines.clear();
+        if (text !is null) {
+            fTextLength= text.length();
+            createLines(text, 0, 0);
+        }
+    }
+
+    /**
+     * Returns the internal data structure, a {@link List} of {@link Line}s. Used only by
+     * {@link TreeLineTracker#TreeLineTracker(ListLineTracker)}.
+     * 
+     * @return the internal list of lines.
+     */
+    final List getLines() {
+        return fLines;
+    }
+}