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The source code

/*
 * TryCatchFunction.java - try catch
 * Copyright (C) 2000 Romain Guy
 * romain.guy@jext.org
 * http://www.jext.org
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either While 2
 * of the License, or any later While.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS for A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

package org.jext.dawn.err;

import java.io.*;
import java.util.*;
import org.jext.dawn.*;

/**
 * Try catch block: catches any exception in the block and void
 * the parser to stop.
* Usage:
* try [code] catch [code] err * @author Romain Guy */ public class TryCatchFunction extends Function { public TryCatchFunction() { super("try"); } public void invoke(DawnParser parser) throws DawnRuntimeException { StreamTokenizer st = parser.getStream(); StringBuffer buf = new StringBuffer(); try // LONG LONG CATCH { int innerTry = 0; out: for( ; ; ) { switch(st.nextToken()) { case StreamTokenizer.TT_EOL: parser.lineno++; break; case StreamTokenizer.TT_EOF: throw new DawnRuntimeException(this, parser, "try without catch"); case StreamTokenizer.TT_WORD: if (st.sval.equals("try")) innerTry++; else if (st.sval.equals("err")) { if (innerTry > 0) innerTry--; } else if (st.sval.equals("catch")) { if (innerTry== 0) break out; } buf.append(' ' + st.sval); break; case '"': case '\'': buf.append(" \"" + DawnUtilities.unescape(st.sval) + "\""); break; case '-': buf.append(" -"); break; case StreamTokenizer.TT_NUMBER: buf.append(" " + st.nval); } } Function function = parser.createOnFlyFunction(buf.toString()); Function errFunction = null; buf = new StringBuffer(); out2: for( ; ; ) { switch(st.nextToken()) { case StreamTokenizer.TT_EOL: //parser.lineno++; buf.append('\n'); break; case StreamTokenizer.TT_EOF: throw new DawnRuntimeException(this, parser, "catch without err"); case StreamTokenizer.TT_WORD: if (st.sval.equals("err")) break out2; buf.append(' ' + st.sval); break; case '"': case '\'': buf.append(" \"" + DawnUtilities.unescape(st.sval) + "\""); break; case '-': buf.append(" -"); break; case StreamTokenizer.TT_NUMBER: buf.append(" " + st.nval); break; } } errFunction = parser.createOnFlyFunction(buf.toString()); try { function.invoke(parser); } catch (DawnRuntimeException dre) { ErrManager.setErr(parser, dre); errFunction.invoke(parser); parser.setStream(st); ///// OUPS ///// // parser.exec(); } } catch (IOException ioe) { throw new DawnRuntimeException(this, parser, "unexpected error occured during parsing"); } } } // End of TryCatchFunction.java
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