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jlechner |
/* gnu/regexp/RETokenStart.java
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Copyright (C) 1998-2001, 2004 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.regexp;
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class RETokenStart extends REToken {
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private String newline; // matches after a newline
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RETokenStart(int subIndex, String newline) {
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super(subIndex);
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this.newline = newline;
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}
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int getMaximumLength() {
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return 0;
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}
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boolean match(CharIndexed input, REMatch mymatch) {
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// charAt(index-n) may be unknown on a Reader/InputStream. FIXME
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// Match after a newline if in multiline mode
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if (newline != null) {
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int len = newline.length();
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if (mymatch.offset >= len) {
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boolean found = true;
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char z;
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int i = 0; // position in REToken.newline
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char ch = input.charAt(mymatch.index - len);
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do {
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z = newline.charAt(i);
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if (ch != z) {
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found = false;
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break;
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}
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++i;
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ch = input.charAt(mymatch.index - len + i);
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} while (i < len);
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if (found) return next(input, mymatch);
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}
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}
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// Don't match at all if REG_NOTBOL is set.
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if ((mymatch.eflags & RE.REG_NOTBOL) > 0) return false;
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if ((mymatch.eflags & RE.REG_ANCHORINDEX) > 0)
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return (mymatch.anchor == mymatch.offset) ?
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next(input, mymatch) : false;
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else
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return ((mymatch.index == 0) && (mymatch.offset == 0)) ?
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next(input, mymatch) : false;
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}
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void dump(StringBuffer os) {
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os.append('^');
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}
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}
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