mirror of git://gcc.gnu.org/git/gcc.git
105 lines
3.6 KiB
Java
105 lines
3.6 KiB
Java
/* gnu/regexp/RETokenWordBoundary.java
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Copyright (C) 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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/**
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* Represents a combination lookahead/lookbehind for POSIX [:alnum:].
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*/
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final class RETokenWordBoundary extends REToken {
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private boolean negated;
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private int where;
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static final int BEGIN = 1;
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static final int END = 2;
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RETokenWordBoundary(int subIndex, int where, boolean negated) {
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super(subIndex);
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this.where = where;
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this.negated = negated;
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}
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boolean match(CharIndexed input, REMatch mymatch) {
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// Word boundary means input[index-1] was a word character
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// and input[index] is not, or input[index] is a word character
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// and input[index-1] was not
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// In the string "one two three", these positions match:
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// |o|n|e| |t|w|o| |t|h|r|e|e|
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// ^ ^ ^ ^ ^ ^
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boolean after = false; // is current character a letter or digit?
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boolean before = false; // is previous character a letter or digit?
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char ch;
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// TODO: Also check REG_ANCHORINDEX vs. anchor
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if (((mymatch.eflags & RE.REG_ANCHORINDEX) != RE.REG_ANCHORINDEX)
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|| (mymatch.offset + mymatch.index > mymatch.anchor)) {
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if ((ch = input.charAt(mymatch.index - 1)) != CharIndexed.OUT_OF_BOUNDS) {
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before = Character.isLetterOrDigit(ch) || (ch == '_');
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}
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}
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if ((ch = input.charAt(mymatch.index)) != CharIndexed.OUT_OF_BOUNDS) {
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after = Character.isLetterOrDigit(ch) || (ch == '_');
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}
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// if (before) and (!after), we're at end (\>)
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// if (after) and (!before), we're at beginning (\<)
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boolean doNext = false;
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if ((where & BEGIN) == BEGIN) {
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doNext = after && !before;
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}
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if ((where & END) == END) {
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doNext ^= before && !after;
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}
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if (negated) doNext = !doNext;
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return (doNext ? next(input, mymatch) : false);
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}
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void dump(StringBuffer os) {
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if (where == (BEGIN | END)) {
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os.append( negated ? "\\B" : "\\b" );
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} else if (where == BEGIN) {
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os.append("\\<");
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} else {
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os.append("\\>");
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}
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}
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}
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