/*
* Copyright (C) 2008, Florian Köberle <florianskarten@web.de>
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* - Neither the name of the Git Development Community nor the
* names of its contributors may be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.spearce_voltpatches.jgit.fnmatch;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.spearce_voltpatches.jgit.errors.InvalidPatternException;
final class GroupHead extends AbstractHead {
private final List<CharacterPattern> characterClasses;
private static final Pattern REGEX_PATTERN = Pattern
.compile("([^-][-][^-]|\\[[.:=].*?[.:=]\\])");
private final boolean inverse;
GroupHead(String pattern, final String wholePattern)
throws InvalidPatternException {
super(false);
this.characterClasses = new ArrayList<CharacterPattern>();
this.inverse = pattern.startsWith("!");
if(inverse) {
pattern = pattern.substring(1);
}
final Matcher matcher = REGEX_PATTERN.matcher(pattern);
while(matcher.find()) {
final String characterClass = matcher.group(0);
if(characterClass.length() == 3 && characterClass.charAt(1) == '-') {
final char start = characterClass.charAt(0);
final char end = characterClass.charAt(2);
characterClasses.add(new CharacterRange(start, end));
}
else if(characterClass.equals("[:alnum:]")) {
characterClasses.add(LetterPattern.INSTANCE);
characterClasses.add(DigitPattern.INSTANCE);
}
else if(characterClass.equals("[:alpha:]")) {
characterClasses.add(LetterPattern.INSTANCE);
}
else if(characterClass.equals("[:blank:]")) {
characterClasses.add(new OneCharacterPattern(' '));
characterClasses.add(new OneCharacterPattern('\t'));
}
else if(characterClass.equals("[:cntrl:]")) {
characterClasses.add(new CharacterRange('\u0000', '\u001F'));
characterClasses.add(new OneCharacterPattern('\u007F'));
}
else if(characterClass.equals("[:digit:]")) {
characterClasses.add(DigitPattern.INSTANCE);
}
else if(characterClass.equals("[:graph:]")) {
characterClasses.add(new CharacterRange('\u0021', '\u007E'));
characterClasses.add(LetterPattern.INSTANCE);
characterClasses.add(DigitPattern.INSTANCE);
}
else if(characterClass.equals("[:lower:]")) {
characterClasses.add(LowerPattern.INSTANCE);
}
else if(characterClass.equals("[:print:]")) {
characterClasses.add(new CharacterRange('\u0020', '\u007E'));
characterClasses.add(LetterPattern.INSTANCE);
characterClasses.add(DigitPattern.INSTANCE);
}
else if(characterClass.equals("[:punct:]")) {
characterClasses.add(PunctPattern.INSTANCE);
}
else if(characterClass.equals("[:space:]")) {
characterClasses.add(WhitespacePattern.INSTANCE);
}
else if(characterClass.equals("[:upper:]")) {
characterClasses.add(UpperPattern.INSTANCE);
}
else if(characterClass.equals("[:xdigit:]")) {
characterClasses.add(new CharacterRange('0', '9'));
characterClasses.add(new CharacterRange('a', 'f'));
characterClasses.add(new CharacterRange('A', 'F'));
}
else if(characterClass.equals("[:word:]")) {
characterClasses.add(new OneCharacterPattern('_'));
characterClasses.add(LetterPattern.INSTANCE);
characterClasses.add(DigitPattern.INSTANCE);
}
else {
final String message = String.format(
"The character class %s is not supported.",
characterClass);
throw new InvalidPatternException(message, wholePattern);
}
pattern = matcher.replaceFirst("");
matcher.reset(pattern);
}
// pattern contains now no ranges
for(int i = 0; i < pattern.length(); i++) {
final char c = pattern.charAt(i);
characterClasses.add(new OneCharacterPattern(c));
}
}
@Override
protected final boolean matches(final char c) {
for(CharacterPattern pattern : characterClasses) {
if(pattern.matches(c)) {
return !inverse;
}
}
return inverse;
}
private interface CharacterPattern {
/**
* @param c the character to test
* @return returns true if the character matches a pattern.
*/
boolean matches(char c);
}
private static final class CharacterRange implements CharacterPattern {
private final char start;
private final char end;
CharacterRange(char start, char end) {
this.start = start;
this.end = end;
}
@Override
public final boolean matches(char c) {
return start <= c && c <= end;
}
}
private static final class DigitPattern implements CharacterPattern {
static final GroupHead.DigitPattern INSTANCE = new DigitPattern();
@Override
public final boolean matches(char c) {
return Character.isDigit(c);
}
}
private static final class LetterPattern implements CharacterPattern {
static final GroupHead.LetterPattern INSTANCE = new LetterPattern();
@Override
public final boolean matches(char c) {
return Character.isLetter(c);
}
}
private static final class LowerPattern implements CharacterPattern {
static final GroupHead.LowerPattern INSTANCE = new LowerPattern();
@Override
public final boolean matches(char c) {
return Character.isLowerCase(c);
}
}
private static final class UpperPattern implements CharacterPattern {
static final GroupHead.UpperPattern INSTANCE = new UpperPattern();
@Override
public final boolean matches(char c) {
return Character.isUpperCase(c);
}
}
private static final class WhitespacePattern implements CharacterPattern {
static final GroupHead.WhitespacePattern INSTANCE = new WhitespacePattern();
@Override
public final boolean matches(char c) {
return Character.isWhitespace(c);
}
}
private static final class OneCharacterPattern implements CharacterPattern {
private char expectedCharacter;
OneCharacterPattern(final char c) {
this.expectedCharacter = c;
}
@Override
public final boolean matches(char c) {
return this.expectedCharacter == c;
}
}
private static final class PunctPattern implements CharacterPattern {
static final GroupHead.PunctPattern INSTANCE = new PunctPattern();
private static String punctCharacters = "-!\"#$%&'()*+,./:;<=>?@[\\]_`{|}~";
@Override
public boolean matches(char c) {
return punctCharacters.indexOf(c) != -1;
}
}
}