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/*******************************************************************************
* Copyright (c) 2000, 2009 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
*******************************************************************************/
package org.eclipse.jface.text;
/**
* A line tracker maps character positions to line numbers and vice versa.
* Initially the line tracker is informed about its underlying text in order to
* initialize the mapping information. After that, the line tracker is informed
* about all changes of the underlying text allowing for incremental updates of
* the mapping information. It is the client's responsibility to actively inform
* the line tacker about text changes. For example, when using a line tracker in
* combination with a document the document controls the line tracker.
* <p>
* In order to provide backward compatibility for clients of <code>ILineTracker</code>, extension
* interfaces are used to provide a means of evolution. The following extension interfaces
* exist:
* <ul>
* <li> {@link org.eclipse.jface.text.ILineTrackerExtension} since version 3.1 introducing the concept
* of rewrite sessions.</li>
* </ul>
* <p>
* Clients may implement this interface or use the standard implementation
* </p>
* {@link org.eclipse.jface.text.DefaultLineTracker}or
* {@link org.eclipse.jface.text.ConfigurableLineTracker}.
*/
public interface ILineTracker {
/**
* Returns the strings this tracker considers as legal line delimiters.
*
* @return the legal line delimiters
*/
String[] getLegalLineDelimiters();
/**
* Returns the line delimiter of the specified line. Returns <code>null</code> if the
* line is not closed with a line delimiter.
*
* @param line the line whose line delimiter is queried
* @return the line's delimiter or <code>null</code> if line does not have a delimiter
* @exception BadLocationException if the line number is invalid in this tracker's line structure
*/
String getLineDelimiter(int line) throws BadLocationException;
/**
* Computes the number of lines in the given text.
*
* @param text the text whose number of lines should be computed
* @return the number of lines in the given text
*/
int computeNumberOfLines(String text);
/**
* Returns the number of lines.
* <p>
* Note that a document always has at least one line.
* </p>
*
* @return the number of lines in this tracker's line structure
*/
int getNumberOfLines();
/**
* Returns the number of lines which are occupied by a given text range.
*
* @param offset the offset of the specified text range
* @param length the length of the specified text range
* @return the number of lines occupied by the specified range
* @exception BadLocationException if specified range is unknown to this tracker
*/
int getNumberOfLines(int offset, int length) throws BadLocationException;
/**
* Returns the position of the first character of the specified line.
*
* @param line the line of interest
* @return offset of the first character of the line
* @exception BadLocationException if the line is unknown to this tracker
*/
int getLineOffset(int line) throws BadLocationException;
/**
* Returns length of the specified line including the line's delimiter.
*
* @param line the line of interest
* @return the length of the line
* @exception BadLocationException if line is unknown to this tracker
*/
int getLineLength(int line) throws BadLocationException;
/**
* Returns the line number the character at the given offset belongs to.
*
* @param offset the offset whose line number to be determined
* @return the number of the line the offset is on
* @exception BadLocationException if the offset is invalid in this tracker
*/
int getLineNumberOfOffset(int offset) throws BadLocationException;
/**
* Returns a line description of the line at the given offset.
* The description contains the start offset and the length of the line
* excluding the line's delimiter.
*
* @param offset the offset whose line should be described
* @return a region describing the line
* @exception BadLocationException if offset is invalid in this tracker
*/
IRegion getLineInformationOfOffset(int offset) throws BadLocationException;
/**
* Returns a line description of the given line. The description
* contains the start offset and the length of the line excluding the line's
* delimiter.
*
* @param line the line that should be described
* @return a region describing the line
* @exception BadLocationException if line is unknown to this tracker
*/
IRegion getLineInformation(int line) throws BadLocationException;
/**
* Informs the line tracker about the specified change in the tracked text.
*
* @param offset the offset of the replaced text
* @param length the length of the replaced text
* @param text the substitution text
* @exception BadLocationException if specified range is unknown to this tracker
*/
void replace(int offset, int length, String text) throws BadLocationException;
/**
* Sets the tracked text to the specified text.
*
* @param text the new tracked text
*/
void set(String text);
}
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