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Jython is an implementation of the high-level, dynamic, object-oriented language Python written in 100% Pure Java, and seamlessly integrated with the Java platform. It thus allows you to run Python on any Java platform.

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/*
 * Copyright 2000 Finn Bock
 *
 * This program contains material copyrighted by:
 * Copyright (c) 1997-2000 by Secret Labs AB.  All rights reserved.
 *
 * This version of the SRE library can be redistributed under CNRI's
 * Python 1.6 license.  For any other use, please contact Secret Labs
 * AB ([email protected]).
 *
 * Portions of this engine have been developed in cooperation with
 * CNRI.  Hewlett-Packard provided funding for 1.6 integration and
 * other compatibility work.
 */

package org.python.modules.sre;

import org.python.core.*;

public class ScannerObject extends PyObject implements Traverseproc {
    public PatternObject pattern;
    PyString string;
    SRE_STATE state;

    public MatchObject match() {
        state.state_reset();
        state.ptr = state.start;

        int status = state.SRE_MATCH(pattern.code, 0, 1);
        MatchObject match = pattern._pattern_new_match(state, string, status);

        if (status == 0 || state.ptr == state.start)
            state.start = state.ptr + 1;
        else
            state.start = state.ptr;

        return match;
    }


    public MatchObject search() {
        state.state_reset();
        state.ptr = state.start;

        int status = state.SRE_SEARCH(pattern.code, 0);
        MatchObject match = pattern._pattern_new_match(state, string, status);

        if (status == 0 || state.ptr == state.start)
            state.start = state.ptr + 1;
        else
            state.start = state.ptr;

        return match;
    }


    /* Traverseproc implementation */
    @Override
    public int traverse(Visitproc visit, Object arg) {
        if (pattern != null) {
            int retVal = visit.visit(pattern, arg);
            if (retVal != 0) {
                return retVal;
            }
        }
        return string != null ? visit.visit(string, arg) : 0;
    }

    @Override
    public boolean refersDirectlyTo(PyObject ob) {
        return ob != null && (ob == pattern || ob == string);
    }
}