| /* |
| * Copyright (c) 2008, 2009, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.nio.fs; |
| |
| import java.util.regex.PatternSyntaxException; |
| |
| public class Globs { |
| private Globs() { } |
| |
| private static final String regexMetaChars = ".^$+{[]|()"; |
| private static final String globMetaChars = "\\*?[{"; |
| |
| private static boolean isRegexMeta(char c) { |
| return regexMetaChars.indexOf(c) != -1; |
| } |
| |
| private static boolean isGlobMeta(char c) { |
| return globMetaChars.indexOf(c) != -1; |
| } |
| private static char EOL = 0; //TBD |
| |
| private static char next(String glob, int i) { |
| if (i < glob.length()) { |
| return glob.charAt(i); |
| } |
| return EOL; |
| } |
| |
| /** |
| * Creates a regex pattern from the given glob expression. |
| * |
| * @throws PatternSyntaxException |
| */ |
| private static String toRegexPattern(String globPattern, boolean isDos) { |
| boolean inGroup = false; |
| StringBuilder regex = new StringBuilder("^"); |
| |
| int i = 0; |
| while (i < globPattern.length()) { |
| char c = globPattern.charAt(i++); |
| switch (c) { |
| case '\\': |
| // escape special characters |
| if (i == globPattern.length()) { |
| throw new PatternSyntaxException("No character to escape", |
| globPattern, i - 1); |
| } |
| char next = globPattern.charAt(i++); |
| if (isGlobMeta(next) || isRegexMeta(next)) { |
| regex.append('\\'); |
| } |
| regex.append(next); |
| break; |
| case '/': |
| if (isDos) { |
| regex.append("\\\\"); |
| } else { |
| regex.append(c); |
| } |
| break; |
| case '[': |
| // don't match name separator in class |
| if (isDos) { |
| regex.append("[[^\\\\]&&["); |
| } else { |
| regex.append("[[^/]&&["); |
| } |
| if (next(globPattern, i) == '^') { |
| // escape the regex negation char if it appears |
| regex.append("\\^"); |
| i++; |
| } else { |
| // negation |
| if (next(globPattern, i) == '!') { |
| regex.append('^'); |
| i++; |
| } |
| // hyphen allowed at start |
| if (next(globPattern, i) == '-') { |
| regex.append('-'); |
| i++; |
| } |
| } |
| boolean hasRangeStart = false; |
| char last = 0; |
| while (i < globPattern.length()) { |
| c = globPattern.charAt(i++); |
| if (c == ']') { |
| break; |
| } |
| if (c == '/' || (isDos && c == '\\')) { |
| throw new PatternSyntaxException("Explicit 'name separator' in class", |
| globPattern, i - 1); |
| } |
| // TBD: how to specify ']' in a class? |
| if (c == '\\' || c == '[' || |
| c == '&' && next(globPattern, i) == '&') { |
| // escape '\', '[' or "&&" for regex class |
| regex.append('\\'); |
| } |
| regex.append(c); |
| |
| if (c == '-') { |
| if (!hasRangeStart) { |
| throw new PatternSyntaxException("Invalid range", |
| globPattern, i - 1); |
| } |
| if ((c = next(globPattern, i++)) == EOL || c == ']') { |
| break; |
| } |
| if (c < last) { |
| throw new PatternSyntaxException("Invalid range", |
| globPattern, i - 3); |
| } |
| regex.append(c); |
| hasRangeStart = false; |
| } else { |
| hasRangeStart = true; |
| last = c; |
| } |
| } |
| if (c != ']') { |
| throw new PatternSyntaxException("Missing ']", globPattern, i - 1); |
| } |
| regex.append("]]"); |
| break; |
| case '{': |
| if (inGroup) { |
| throw new PatternSyntaxException("Cannot nest groups", |
| globPattern, i - 1); |
| } |
| regex.append("(?:(?:"); |
| inGroup = true; |
| break; |
| case '}': |
| if (inGroup) { |
| regex.append("))"); |
| inGroup = false; |
| } else { |
| regex.append('}'); |
| } |
| break; |
| case ',': |
| if (inGroup) { |
| regex.append(")|(?:"); |
| } else { |
| regex.append(','); |
| } |
| break; |
| case '*': |
| if (next(globPattern, i) == '*') { |
| // crosses directory boundaries |
| regex.append(".*"); |
| i++; |
| } else { |
| // within directory boundary |
| if (isDos) { |
| regex.append("[^\\\\]*"); |
| } else { |
| regex.append("[^/]*"); |
| } |
| } |
| break; |
| case '?': |
| if (isDos) { |
| regex.append("[^\\\\]"); |
| } else { |
| regex.append("[^/]"); |
| } |
| break; |
| |
| default: |
| if (isRegexMeta(c)) { |
| regex.append('\\'); |
| } |
| regex.append(c); |
| } |
| } |
| |
| if (inGroup) { |
| throw new PatternSyntaxException("Missing '}", globPattern, i - 1); |
| } |
| |
| return regex.append('$').toString(); |
| } |
| |
| static String toUnixRegexPattern(String globPattern) { |
| return toRegexPattern(globPattern, false); |
| } |
| |
| static String toWindowsRegexPattern(String globPattern) { |
| return toRegexPattern(globPattern, true); |
| } |
| } |