Imported GNU Classpath 0.90
[official-gcc.git] / libjava / classpath / gnu / regexp / RETokenChar.java
blob1b3a74855ece1b929c190bf7ad8cc88251a8e795
1 /* gnu/regexp/RETokenChar.java
2 Copyright (C) 2006 Free Software Foundation, Inc.
4 This file is part of GNU Classpath.
6 GNU Classpath is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
9 any later version.
11 GNU Classpath is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU Classpath; see the file COPYING. If not, write to the
18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19 02110-1301 USA.
21 Linking this library statically or dynamically with other modules is
22 making a combined work based on this library. Thus, the terms and
23 conditions of the GNU General Public License cover the whole
24 combination.
26 As a special exception, the copyright holders of this library give you
27 permission to link this library with independent modules to produce an
28 executable, regardless of the license terms of these independent
29 modules, and to copy and distribute the resulting executable under
30 terms of your choice, provided that you also meet, for each linked
31 independent module, the terms and conditions of the license of that
32 module. An independent module is a module which is not derived from
33 or based on this library. If you modify this library, you may extend
34 this exception to your version of the library, but you are not
35 obligated to do so. If you do not wish to do so, delete this
36 exception statement from your version. */
39 package gnu.regexp;
41 final class RETokenChar extends REToken {
42 private char[] ch;
43 private boolean insens;
45 RETokenChar(int subIndex, char c, boolean ins) {
46 super(subIndex);
47 insens = ins;
48 ch = new char [1];
49 ch[0] = c;
52 int getMinimumLength() {
53 return ch.length;
56 int getMaximumLength() {
57 return ch.length;
60 REMatch matchThis(CharIndexed input, REMatch mymatch) {
61 int z = ch.length;
62 if (matchOneString(input, mymatch.index)) {
63 mymatch.index += z;
64 return mymatch;
66 return null;
69 boolean matchOneString(CharIndexed input, int index) {
70 int z = ch.length;
71 char c;
72 for (int i=0; i<z; i++) {
73 c = input.charAt(index+i);
74 if (! charEquals(c, ch[i])) {
75 return false;
78 return true;
81 private boolean charEquals(char c1, char c2) {
82 if (c1 == c2) return true;
83 if (! insens) return false;
84 if (toLowerCase(c1, unicodeAware) == c2) return true;
85 if (toUpperCase(c1, unicodeAware) == c2) return true;
86 return false;
89 boolean returnsFixedLengthMatches() { return true; }
91 int findFixedLengthMatches(CharIndexed input, REMatch mymatch, int max) {
92 int index = mymatch.index;
93 int numRepeats = 0;
94 int z = ch.length;
95 while (true) {
96 if (numRepeats >= max) break;
97 if (matchOneString(input, index)) {
98 index += z;
99 numRepeats++;
101 else break;
103 return numRepeats;
106 // Overrides REToken.chain() to optimize for strings
107 boolean chain(REToken next) {
108 if (next instanceof RETokenChar && ((RETokenChar)next).insens == insens) {
109 RETokenChar cnext = (RETokenChar) next;
110 // assume for now that next can only be one character
111 int newsize = ch.length + cnext.ch.length;
113 char[] chTemp = new char [newsize];
115 System.arraycopy(ch,0,chTemp,0,ch.length);
116 System.arraycopy(cnext.ch,0,chTemp,ch.length,cnext.ch.length);
118 ch = chTemp;
119 return false;
120 } else return super.chain(next);
123 void dump(StringBuffer os) {
124 os.append(ch);