/*
* SK's Minecraft Launcher
* Copyright (C) 2010-2014 Albert Pham <http://www.sk89q.com> and contributors
* Please see LICENSE.txt for license information.
*/
/* $OpenBSD: fnmatch.c,v 1.13 2006/03/31 05:34:14 deraadt Exp $ */
package com.skcraft.launcher.builder;
import java.util.EnumSet;
/*
* Function fnmatch() as specified in POSIX 1003.2-1992, section B.6.
* Compares a filename or pathname to a pattern.
*/
public class FnMatch {
public static enum Flag {
/** Disable backslash escaping. */
NOESCAPE,
/** Slash must be matched by slash. */
PATHNAME,
/** Period must be matched by period. */
PERIOD,
/** Ignore /<tail> after Imatch. */
LEADING_DIR,
/** Case insensitive search. */
CASEFOLD
}
private static final int RANGE_ERROR = -1;
private static final int RANGE_NOMATCH = 0;
public static boolean fnmatch(String pattern, String string, EnumSet<Flag> flags) {
return match(pattern, 0, string, 0, flags);
}
public static boolean fnmatch(String pattern, String string, int stringPos, Flag flag) {
return match(pattern, 0, string, stringPos, EnumSet.of(flag));
}
public static boolean fnmatch(String pattern, String string, int stringPos) {
return match(pattern, 0, string, stringPos, EnumSet.noneOf(Flag.class));
}
public static boolean fnmatch(String pattern, String string) {
return fnmatch(pattern, string, 0);
}
private static boolean match(String pattern, int patternPos,
String string, int stringPos, EnumSet<Flag> flags) {
char c;
while (true) {
if (patternPos >= pattern.length()) {
if (flags.contains(Flag.LEADING_DIR) && string.charAt(stringPos) == '/') {
return true;
}
return stringPos == string.length();
}
c = pattern.charAt(patternPos++);
switch (c) {
case '?':
if (stringPos >= string.length()) {
return false;
}
if (string.charAt(stringPos) == '/' && flags.contains(Flag.PATHNAME)) {
return false;
}
if (hasLeadingPeriod(string, stringPos, flags)) {
return false;
}
++stringPos;
continue;
case '*':
/* Collapse multiple stars. */
while (patternPos < pattern.length() &&
(c = pattern.charAt(patternPos)) == '*') {
patternPos++;
}
if (hasLeadingPeriod(string, stringPos, flags)) {
return false;
}
/* Optimize for pattern with * at end or before /. */
if (patternPos == pattern.length()) {
if (flags.contains(Flag.PATHNAME)) {
return flags.contains(Flag.LEADING_DIR) ||
string.indexOf('/', stringPos) == -1;
}
return true;
} else if (c == '/' && flags.contains(Flag.PATHNAME)) {
stringPos = string.indexOf('/', stringPos);
if (stringPos == -1) {
return false;
}
continue;
}
/* General case, use recursion. */
while (stringPos < string.length()) {
if (flags.contains(Flag.PERIOD)) {
flags = EnumSet.copyOf(flags);
flags.remove(Flag.PERIOD);
}
if (match(pattern, patternPos, string, stringPos, flags)) {
return true;
}
if (string.charAt(stringPos) == '/' && flags.contains(Flag.PATHNAME)) {
break;
}
++stringPos;
}
return false;
case '[':
if (stringPos >= string.length()) {
return false;
}
if (string.charAt(stringPos) == '/' && flags.contains(Flag.PATHNAME)) {
return false;
}
if (hasLeadingPeriod(string, stringPos, flags)) {
return false;
}
int result = matchRange(pattern, patternPos, string.charAt(stringPos), flags);
if (result == RANGE_ERROR) /* not a good range, treat as normal text */ {
break;
}
if (result == RANGE_NOMATCH) {
return false;
}
patternPos = result;
++stringPos;
continue;
case '\\':
if (!flags.contains(Flag.NOESCAPE)) {
if (patternPos >= pattern.length()) {
c = '\\';
} else {
c = pattern.charAt(patternPos++);
}
}
break;
}
if (stringPos >= string.length()) {
return false;
}
if (c != string.charAt(stringPos) &&
!(flags.contains(Flag.CASEFOLD) &&
Character.toLowerCase(c) == Character.toLowerCase(string.charAt(stringPos)))) {
return false;
}
++stringPos;
}
/* NOTREACHED */
}
private static boolean hasLeadingPeriod(String string, int stringPos, EnumSet<Flag> flags) {
if (stringPos > string.length() - 1)
return false;
return (stringPos == 0
|| (flags.contains(Flag.PATHNAME) && string.charAt(stringPos - 1) == '/'))
&& string.charAt(stringPos) == '.' && flags.contains(Flag.PERIOD);
}
private static int matchRange(String pattern, int patternPos, char test, EnumSet<Flag> flags) {
boolean negate, ok;
char c, c2;
if (patternPos >= pattern.length()) {
return RANGE_ERROR;
}
/*
* A bracket expression starting with an unquoted circumflex
* character produces unspecified results (IEEE 1003.2-1992,
* 3.13.2). This implementation treats it like '!', for
* consistency with the regular expression syntax.
* J.T. Conklin (conklin@ngai.kaleida.com)
*/
c = pattern.charAt(patternPos);
negate = c == '!' || c == '^';
if (negate) {
++patternPos;
}
if (flags.contains(Flag.CASEFOLD)) {
test = Character.toLowerCase(test);
}
/*
* A right bracket shall lose its special meaning and represent
* itself in a bracket expression if it occurs first in the list.
* -- POSIX.2 2.8.3.2
*/
ok = false;
while (true) {
if (patternPos >= pattern.length()) {
return RANGE_ERROR;
}
c = pattern.charAt(patternPos++);
if (c == ']') {
break;
}
if (c == '\\' && !flags.contains(Flag.NOESCAPE)) {
c = pattern.charAt(patternPos++);
}
if (c == '/' && flags.contains(Flag.PATHNAME)) {
return RANGE_NOMATCH;
}
if (flags.contains(Flag.CASEFOLD)) {
c = Character.toLowerCase(c);
}
if (pattern.charAt(patternPos) == '-' &&
patternPos + 1 < pattern.length() &&
(c2 = pattern.charAt(patternPos + 1)) != ']') {
patternPos += 2;
if (c2 == '\\' && !flags.contains(Flag.NOESCAPE)) {
if (patternPos >= pattern.length()) {
return RANGE_ERROR;
}
c = pattern.charAt(patternPos++);
}
if (flags.contains(Flag.CASEFOLD)) {
c2 = Character.toLowerCase(c2);
}
if (c <= test && test <= c2) {
ok = true;
}
} else if (c == test) {
ok = true;
}
}
return ok == negate ? RANGE_NOMATCH : patternPos;
}
}