/jEdit/tags/jedit-4-0-pre3/gnu/regexp/RETokenOneOf.java
Java | 112 lines | 74 code | 13 blank | 25 comment | 23 complexity | 4def0c64def72d1b929b86a0a7a9b127 MD5 | raw file
Possible License(s): BSD-3-Clause, AGPL-1.0, Apache-2.0, LGPL-2.0, LGPL-3.0, GPL-2.0, CC-BY-SA-3.0, LGPL-2.1, GPL-3.0, MPL-2.0-no-copyleft-exception, IPL-1.0
- /*
- * gnu/regexp/RETokenOneOf.java
- * Copyright (C) 1998-2001 Wes Biggs
- *
- * This library is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License as published
- * by the Free Software Foundation; either version 2.1 of the License, or
- * (at your option) any later version.
- *
- * This library 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 Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
- package gnu.regexp;
- import java.util.Vector;
- final class RETokenOneOf extends REToken {
- private Vector options;
- private boolean negative;
- // This constructor is used for convenience when we know the set beforehand,
- // e.g. \d --> new RETokenOneOf("0123456789",false, ..)
- // \D --> new RETokenOneOf("0123456789",true, ..)
- RETokenOneOf(int subIndex, String optionsStr, boolean negative, boolean insens) {
- super(subIndex);
- options = new Vector();
- this.negative = negative;
- for (int i = 0; i < optionsStr.length(); i++)
- options.addElement(new RETokenChar(subIndex,optionsStr.charAt(i),insens));
- }
- RETokenOneOf(int subIndex, Vector options, boolean negative) {
- super(subIndex);
- this.options = options;
- this.negative = negative;
- }
- int getMinimumLength() {
- int min = Integer.MAX_VALUE;
- int x;
- for (int i=0; i < options.size(); i++) {
- if ((x = ((REToken) options.elementAt(i)).getMinimumLength()) < min)
- min = x;
- }
- return min;
- }
- boolean match(CharIndexed input, REMatch mymatch) {
- if (negative && (input.charAt(mymatch.index) == CharIndexed.OUT_OF_BOUNDS))
- return false;
- REMatch newMatch = null;
- REMatch last = null;
- REToken tk;
- boolean isMatch;
- for (int i=0; i < options.size(); i++) {
- tk = (REToken) options.elementAt(i);
- REMatch tryMatch = (REMatch) mymatch.clone();
- if (tk.match(input, tryMatch)) { // match was successful
- if (negative) return false;
- if (next(input, tryMatch)) {
- // Add tryMatch to list of possibilities.
- if (last == null) {
- newMatch = tryMatch;
- last = tryMatch;
- } else {
- last.next = tryMatch;
- last = tryMatch;
- }
- } // next succeeds
- } // is a match
- } // try next option
- if (newMatch != null) {
- if (negative) {
- return false;
- } else {
- // set contents of mymatch equal to newMatch
- // try each one that matched
- mymatch.assignFrom(newMatch);
- return true;
- }
- } else {
- if (negative) {
- ++mymatch.index;
- return next(input, mymatch);
- } else {
- return false;
- }
- }
- // index+1 works for [^abc] lists, not for generic lookahead (--> index)
- }
- void dump(StringBuffer os) {
- os.append(negative ? "[^" : "(?:");
- for (int i = 0; i < options.size(); i++) {
- if (!negative && (i > 0)) os.append('|');
- ((REToken) options.elementAt(i)).dumpAll(os);
- }
- os.append(negative ? ']' : ')');
- }
- }