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BEGIN LICENSE BLOCK ***** Version: CPL 1.0/GPL 2.0/LGPL 2.1 The contents of this file are subject to the Common Public License Version 1.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at Software distributed under the License is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the specific language governing rights and limitations under the License. Copyright (C) 2005 Thomas E Enebo <> Alternatively, the contents of this file may be used under the terms of either of the GNU General Public License Version 2 or later (the "GPL"), or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), in which case the provisions of the GPL or the LGPL are applicable instead of those above. If you wish to allow use of your version of this file only under the terms of either the GPL or the LGPL, and not to allow others to use your version of this file under the terms of the CPL, indicate your decision by deleting the provisions above and replace them with the notice and other provisions required by the GPL or the LGPL. If you do not delete the provisions above, a recipient may use your version of this file under the terms of any one of the CPL, the GPL or the LGPL. END LICENSE BLOCK ***
package org.jruby.lexer.yacc;
This interface is the combination of two needs: 1) A Ruby interpreter position (for warnings and errors). The interpreter only cares about filename and endLine. 2) A IDE position (offsets for showing ranges of grammatical elements). The offsets represent positions 'between' characters. So a variable 'abc' has a startOffset of 0 and an endOffset of 3 ( 0a1b2c3 ).
public interface ISourcePosition extends PositionAware {
Which file does this source position live in?

name of the source file.
	public String getFile();
Which is the first(start) line that this source position occurs on (zero-based)

	public int getStartLine();

For nodes which are added to the AST which are not proper syntactical elements.
    public static final ISourcePosition INVALID_POSITION = new ISourcePosition() {
        public String getFile() {
            return "dummy";
        public int getStartLine() {
            return -1;
        public int getLine() {
            return -1;
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