mirror of git://gcc.gnu.org/git/gcc.git
131 lines
4.1 KiB
Java
131 lines
4.1 KiB
Java
/* gnu/regexp/RETokenOneOf.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., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 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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import java.util.Vector;
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final class RETokenOneOf extends REToken {
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private Vector options;
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private boolean negative;
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// This constructor is used for convenience when we know the set beforehand,
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// e.g. \d --> new RETokenOneOf("0123456789",false, ..)
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// \D --> new RETokenOneOf("0123456789",true, ..)
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RETokenOneOf(int subIndex, String optionsStr, boolean negative, boolean insens) {
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super(subIndex);
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options = new Vector();
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this.negative = negative;
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for (int i = 0; i < optionsStr.length(); i++)
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options.addElement(new RETokenChar(subIndex,optionsStr.charAt(i),insens));
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}
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RETokenOneOf(int subIndex, Vector options, boolean negative) {
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super(subIndex);
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this.options = options;
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this.negative = negative;
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}
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int getMinimumLength() {
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int min = Integer.MAX_VALUE;
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int x;
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for (int i=0; i < options.size(); i++) {
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if ((x = ((REToken) options.elementAt(i)).getMinimumLength()) < min)
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min = x;
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}
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return min;
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}
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boolean match(CharIndexed input, REMatch mymatch) {
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if (negative && (input.charAt(mymatch.index) == CharIndexed.OUT_OF_BOUNDS))
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return false;
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REMatch newMatch = null;
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REMatch last = null;
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REToken tk;
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boolean isMatch;
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for (int i=0; i < options.size(); i++) {
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tk = (REToken) options.elementAt(i);
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REMatch tryMatch = (REMatch) mymatch.clone();
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if (tk.match(input, tryMatch)) { // match was successful
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if (negative) return false;
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if (next(input, tryMatch)) {
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// Add tryMatch to list of possibilities.
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if (last == null) {
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newMatch = tryMatch;
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last = tryMatch;
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} else {
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last.next = tryMatch;
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last = tryMatch;
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}
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} // next succeeds
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} // is a match
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} // try next option
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if (newMatch != null) {
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if (negative) {
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return false;
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} else {
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// set contents of mymatch equal to newMatch
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// try each one that matched
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mymatch.assignFrom(newMatch);
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return true;
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}
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} else {
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if (negative) {
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++mymatch.index;
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return next(input, mymatch);
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} else {
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return false;
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}
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}
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// index+1 works for [^abc] lists, not for generic lookahead (--> index)
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}
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void dump(StringBuffer os) {
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os.append(negative ? "[^" : "(?:");
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for (int i = 0; i < options.size(); i++) {
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if (!negative && (i > 0)) os.append('|');
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((REToken) options.elementAt(i)).dumpAll(os);
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}
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os.append(negative ? ']' : ')');
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}
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}
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