001    /*
002      Copyright (C) 2003 Laurent Martelli <laurent@aopsys.com>
003    
004      This program is free software; you can redistribute it and/or modify
005      it under the terms of the GNU Lesser General Public License as
006      published by the Free Software Foundation; either version 2 of the
007      License, or (at your option) any later version.
008    
009      This program is distributed in the hope that it will be useful,
010      but WITHOUT ANY WARRANTY; without even the implied warranty of
011      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
012      GNU Lesser General Public License for more details.
013    
014      You should have received a copy of the GNU Lesser General Public
015      License along with this program; if not, write to the Free Software
016      Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
017      USA */
018    
019    package org.objectweb.jac.core.parsers.acc;
020    
021    import java.io.Reader;
022    import java.util.Collection;
023    import java.util.HashSet;
024    import java.util.Set;
025    import java.util.Vector;
026    import java_cup.runtime.Symbol;
027    import org.apache.log4j.Logger;
028    import org.objectweb.jac.core.parsers.acc.ToolParser;
029    
030    public class ToolParserWrapper extends ToolParser
031    {
032        static Logger logger = Logger.getLogger("acc.parser");
033    
034        public ToolParserWrapper() {
035            this.blockKeywords = new HashSet();
036        }
037    
038        public ToolParserWrapper(Set blockKeywords) {
039            this.blockKeywords = blockKeywords;
040        }
041    
042        Set blockKeywords;
043        public void addBlockKeywords(Collection keywords) {
044            blockKeywords.addAll(blockKeywords);
045        }
046        public void setBlockKeywords(Set keywords) {
047            blockKeywords.addAll(keywords);
048        }
049    
050        /**
051         * Parses some input from a reader.
052         * @param input reader to parse from
053         * @param streamName name of the stream to read from
054         * @return a List of SyntaxElement
055         */
056        public NonTerminal parse(Reader input, String streamName) 
057        {
058            AccScanner lexer = new AccScanner(input,streamName, blockKeywords);
059            setScanner(lexer);
060            // Parse the input expression
061            logger.debug("Parsing "+streamName+" keywords="+blockKeywords+"...");
062            Vector methods = null;
063            try {
064                syntaxElements = (NonTerminal)parse().value;
065                //          System.out.println(methods);
066                logger.debug(streamName+" parsed");
067            } catch (Exception e) {
068                //lexer.printState();
069                logger.warn("Parser error in "+streamName+" : "+e);
070                //         e.printStackTrace();
071            }
072            return syntaxElements;
073        }
074    
075        NonTerminal syntaxElements;
076        public NonTerminal getSyntaxElements() {
077            return syntaxElements;
078        }
079    
080        public void report_error(String message, Object info) {
081            logger.debug(message+" at character "+((Symbol)info).left+
082                         "("+((AccScanner)getScanner()).getLine()+")");
083        }   
084    
085        /**
086         * Returns the Terminal at a given position, or null
087         * @param position the position of the requested Terminal
088         */
089        public Terminal getTerminalAt(int position) {
090            if (syntaxElements!=null)
091                return syntaxElements.getTerminalAt(position);
092            else 
093                return null;
094        }
095    
096        /**
097         * Gets the "deepest" element at a given position, or null
098         * @param position the position of the requested SyntaxElement
099         */
100        public SyntaxElement getSyntaxElementAt(int position) {
101            if (syntaxElements!=null)
102                return syntaxElements.getSyntaxElementAt(position);
103            else 
104                return null;
105        }
106    
107        /**
108         * Gets the "deepest" element at a given position with a given
109         * name, or null
110         * @param position the position of the requested SyntaxElement 
111         * @param name searched name
112         */
113        public SyntaxElement getSyntaxElementAt(int position, String name) {
114            if (syntaxElements!=null) {
115                SyntaxElement element = syntaxElements.getSyntaxElementAt(position);
116                if (element!=null)
117                    return element.findParent(name);
118                else 
119                    return null;
120            } else 
121                return null;
122        }
123    }