diff options
Diffstat (limited to 'libjava/classpath/gnu/java/util/regex/RETokenLookBehind.java')
-rw-r--r-- | libjava/classpath/gnu/java/util/regex/RETokenLookBehind.java | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/util/regex/RETokenLookBehind.java b/libjava/classpath/gnu/java/util/regex/RETokenLookBehind.java new file mode 100644 index 00000000000..a01a15bc90f --- /dev/null +++ b/libjava/classpath/gnu/java/util/regex/RETokenLookBehind.java @@ -0,0 +1,118 @@ +/* gnu/regexp/RETokenLookBehind.java + Copyright (C) 2006 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath 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 +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + +package gnu.java.util.regex; + +/** + * @author Ito Kazumitsu + */ +final class RETokenLookBehind extends REToken +{ + REToken re; + boolean negative; + + RETokenLookBehind(REToken re, boolean negative) throws REException { + super(0); + this.re = re; + this.negative = negative; + } + + int getMaximumLength() { + return 0; + } + + REMatch matchThis(CharIndexed input, REMatch mymatch) + { + int max = re.getMaximumLength(); + CharIndexed behind = input.lookBehind(mymatch.index, max); + REMatch trymatch = (REMatch)mymatch.clone(); + REMatch trymatch1 = (REMatch)mymatch.clone(); + REMatch newMatch = null; + int diff = behind.length() - input.length(); + int curIndex = trymatch.index + diff; + trymatch.index = 0; + trymatch.offset = 0; + RETokenMatchHereOnly stopper = new RETokenMatchHereOnly(curIndex); + REToken re1 = (REToken) re.clone(); + re1.chain(stopper); + if (re1.match(behind, trymatch)) { + if (negative) return null; + for (int i = 0; i < trymatch.start.length; i++) { + if (trymatch.start[i] != -1 && trymatch.end[i] != -1) { + trymatch.start[i] -= diff; + if (trymatch.start[i] < 0) trymatch.start[i] -= 1; + trymatch.end[i] -= diff; + if (trymatch.end[i] < 0) trymatch.end[i] -= 1; + } + } + trymatch.index = mymatch.index; + trymatch.offset = mymatch.offset; + return trymatch; + } + else { + if (negative) return mymatch; + return null; + } + } + + void dump(StringBuffer os) { + os.append("(?<"); + os.append(negative ? '!' : '='); + re.dumpAll(os); + os.append(')'); + } + + private static class RETokenMatchHereOnly extends REToken { + + int getMaximumLength() { return 0; } + + private int index; + + RETokenMatchHereOnly(int index) { + super(0); + this.index = index; + } + + REMatch matchThis(CharIndexed input, REMatch mymatch) { + return (index == mymatch.index ? mymatch : null); + } + + void dump(StringBuffer os) {} + + } +} + |