com.gargoylesoftware.css.parser.ParserUtils Maven / Gradle / Ivy
/*
* Copyright (c) 2018 Ronald Brill.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.gargoylesoftware.css.parser;
/**
* Util methods used by the parser and lexer.
*
* @author Ronald Brill
*/
public final class ParserUtils {
private ParserUtils() {
}
/**
* Remove the given number of chars from start and end.
* There is no parameter checking, the caller has to take care of this.
*
* @param s the StringBuilder
* @param left no of chars to be removed from start
* @param right no of chars to be removed from end
* @return the trimmed string
*/
public static String trimBy(final StringBuilder s, final int left, final int right) {
return s.substring(left, s.length() - right);
}
/**
* Helper that removes the leading "url(", the trailing ")"
* and surrounding quotes from the given string builder.
* @param s the StringBuilder
* @return the trimmed string
*/
public static String trimUrl(final StringBuilder s) {
final String s1 = trimBy(s, 4, 1).trim();
if (s1.length() == 0) {
return s1;
}
final int end = s1.length() - 1;
final char c0 = s1.charAt(0);
if ((c0 == '"' && s1.charAt(end) == '"')
|| (c0 == '\'' && s1.charAt(end) == '\'')) {
return s1.substring(1, end);
}
return s1;
}
}