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UnicodePreprocessor.java

package edu.ksu.cis.bandera.jjjc.unicodepreprocessor;

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Bandera, a Java(TM) analysis and transformation toolkit           *
 * Copyright (C) 1998-2001 SAnToS Laboratories (santos@cis.ksu.edu)  *

 * All rights reserved.                                              *
 *                                                                   *
 * This work was done as a project in the SAnToS Laboratory,         *
 * Department of Computing and Information Sciences, Kansas State    *
 * University, USA (http://www.cis.ksu.edu/santos).                  *
 * It is understood that any modification not identified as such is  *
 * not covered by the preceding statement.                           *
 *                                                                   *
 * This work is free software; you can redistribute it and/or        *
 * modify it under the terms of the GNU Library General Public       *
 * License as published by the Free Software Foundation; either      *
 * version 2 of the License, or (at your option) any later version.  *
 *                                                                   *
 * This work 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 *
 * Library General Public License for more details.                  *
 *                                                                   *
 * You should have received a copy of the GNU Library General Public *
 * License along with this toolkit; if not, write to the             *
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,      *
 * Boston, MA  02111-1307, USA.                                      *
 *                                                                   *
 * Java is a trademark of Sun Microsystems, Inc.                     *
 *                                                                   *
 * To submit a bug report, send a comment, or get the latest news on *
 * this project and other SAnToS projects, please visit the web-site *
 *                http://www.cis.ksu.edu/santos                      *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
import java.io.*;

import edu.ksu.cis.bandera.jjjc.unicodepreprocessor.lexer.*;
import edu.ksu.cis.bandera.jjjc.unicodepreprocessor.node.*;
import edu.ksu.cis.bandera.jjjc.unicodepreprocessor.analysis.*;

public class UnicodePreprocessor extends Reader {
    private UnicodeLexer lexer;
    private ProcessToken processor = new ProcessToken();

    int available;
    char[] buffer = new char[2];

    private class ProcessToken extends AnalysisAdapter {
        public void caseTEvenBackslash(TEvenBackslash node) {
            buffer[0] = '\\';
            buffer[1] = '\\';
            available = 2;
        }

        public void caseTUnicodeEscape(TUnicodeEscape node) {
            String text = node.getText();
            buffer[0] = (char) Integer.parseInt(
                    text.substring(text.length() - 4), 16);
            available = 1;
        }

        public void caseTErroneousEscape(TErroneousEscape node) {
            throw new RuntimeException("Erroneous escape: " + node);
        }

        public void caseTSub(TSub node) {
            buffer[0] = node.getText().charAt(0);
            available = 1;
        }

        public void caseTRawInputCharacter(TRawInputCharacter node) {
            buffer[0] = node.getText().charAt(0);
            available = 1;
        }

        public void caseEOF(EOF node) {
            available = 0;
        }
    }

    public UnicodePreprocessor(PushbackReader in) {
        lexer = new UnicodeLexer(in);
    }
    public void close() {
    }
    public int read() throws IOException {
        if (available == 0) {
            try {
                lexer.next().apply(processor);
            } catch (LexerException e) {
                throw new RuntimeException(e.toString());
            }
        }

        if (available == 0) {
            return -1;
        }

        char c = buffer[0];
        buffer[0] = buffer[1];
        available--;

        return c;
    }
    public int read(char cbuf[], int off, int len) throws IOException {
        for (int i = 0; i < len; i++) {
            int c = read();

            if (c == -1) {
                if (i == 0) {
                    return -1;
                } else {
                    return i;
                }
            }

            cbuf[off + i] = (char) c;
        }

        return len;
    }
}

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