/Users/parrt/antlr/code/antlr/main/runtime/Java/src/org/antlr/runtime/RecognitionException.java

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/*
 [The "BSD licence"]
 Copyright (c) 2005-2008 Terence Parr
 All rights reserved.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions
 are met:
 1. Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.
 2. Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in the
    documentation and/or other materials provided with the distribution.
 3. The name of the author may not be used to endorse or promote products
    derived from this software without specific prior written permission.

 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.antlr.runtime;

import org.antlr.runtime.tree.*;

public class RecognitionException extends Exception {
        public transient IntStream input;

        public int index;

        public Token token;

        public Object node;

        public int c;

        public int line;

        public int charPositionInLine;

        public boolean approximateLineInfo;

        public RecognitionException() {
        }

        public RecognitionException(IntStream input) {
                this.input = input;
                this.index = input.index();
                if ( input instanceof TokenStream ) {
                        this.token = ((TokenStream)input).LT(1);
                        this.line = token.getLine();
                        this.charPositionInLine = token.getCharPositionInLine();
                }
                if ( input instanceof TreeNodeStream ) {
                        extractInformationFromTreeNodeStream(input);
                }
                else if ( input instanceof CharStream ) {
                        this.c = input.LA(1);
                        this.line = ((CharStream)input).getLine();
                        this.charPositionInLine = ((CharStream)input).getCharPositionInLine();
                }
                else {
                        this.c = input.LA(1);
                }
        }

        protected void extractInformationFromTreeNodeStream(IntStream input) {
                TreeNodeStream nodes = (TreeNodeStream)input;
                this.node = nodes.LT(1);
                TreeAdaptor adaptor = nodes.getTreeAdaptor();
                Token payload = adaptor.getToken(node);
                if ( payload!=null ) {
                        this.token = payload;
                        if ( payload.getLine()<= 0 ) {
                                // imaginary node; no line/pos info; scan backwards
                                int i = -1;
                                Object priorNode = nodes.LT(i);
                                while ( priorNode!=null ) {
                                        Token priorPayload = adaptor.getToken(priorNode);
                                        if ( priorPayload!=null && priorPayload.getLine()>0 ) {
                                                // we found the most recent real line / pos info
                                                this.line = priorPayload.getLine();
                                                this.charPositionInLine = priorPayload.getCharPositionInLine();
                                                this.approximateLineInfo = true;
                                                break;
                                        }
                                        --i;
                                        priorNode = nodes.LT(i);
                                }
                        }
                        else { // node created from real token
                                this.line = payload.getLine();
                                this.charPositionInLine = payload.getCharPositionInLine();
                        }
                }
                else if ( this.node instanceof Tree) {
                        this.line = ((Tree)this.node).getLine();
                        this.charPositionInLine = ((Tree)this.node).getCharPositionInLine();
                        if ( this.node instanceof CommonTree) {
                                this.token = ((CommonTree)this.node).token;
                        }
                }
                else {
                        int type = adaptor.getType(this.node);
                        String text = adaptor.getText(this.node);
                        this.token = new CommonToken(type, text);
                }
        }

        public int getUnexpectedType() {
                if ( input instanceof TokenStream ) {
                        return token.getType();
                }
                else if ( input instanceof TreeNodeStream ) {
                        TreeNodeStream nodes = (TreeNodeStream)input;
                        TreeAdaptor adaptor = nodes.getTreeAdaptor();
                        return adaptor.getType(node);
                }
                else {
                        return c;
                }
        }
}

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