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- /*
- * Copyright (c) 2006-2017 DMDirc Developers
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
- * documentation files (the "Software"), to deal in the Software without restriction, including without limitation the
- * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
- * permit persons to whom the Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the
- * Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
- * WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
- * OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
- * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
-
- package com.dmdirc.util.text;
-
- import java.util.ArrayList;
- import java.util.List;
- import java.util.regex.Matcher;
- import java.util.regex.Pattern;
-
- /**
- * Finds links within a body of text.
- */
- public class LinkExtractor {
-
- /** Defines all characters treated as trailing punctuation that are illegal in URLs. */
- private static final String URL_PUNCT_ILLEGAL = "\"";
- /** Defines all characters treated as trailing punctuation that're legal in URLs. */
- private static final String URL_PUNCT_LEGAL = "';:!,\\.\\?";
- /** Defines all trailing punctuation. */
- private static final String URL_PUNCT = URL_PUNCT_ILLEGAL + URL_PUNCT_LEGAL;
- /** Defines all characters allowed in URLs that aren't treated as trailing punct. */
- private static final String URL_NOPUNCT = "a-z0-9$\\-_@&\\+\\*\\(\\)=/#%~\\|";
- /** Defines all characters allowed in URLs per W3C specs. */
- private static final String URL_CHARS = '[' + URL_PUNCT_LEGAL + URL_NOPUNCT
- + "]*[" + URL_NOPUNCT + "]+[" + URL_PUNCT_LEGAL + URL_NOPUNCT + "]*";
- /** The regular expression to use for marking up URLs. */
- private static final String URL_REGEXP = "(?i)((?>(?<!" + "[a-f0-9]{5})[a-f]|[g-z+])+://" +
- URL_CHARS + "|(?<![a-z0-9:/])www\\." + URL_CHARS + ')';
- /** The pattern to use to match URLs. */
- private static final Pattern URL_PATTERN = Pattern.compile(URL_REGEXP);
-
- /**
- * Finds all available links within the given text.
- *
- * @param text The text to search for links.
- * @return A list of found links, ordered according to their position in the text.
- */
- public List<Link> findLinks(final CharSequence text) {
- final List<Link> res = new ArrayList<>();
- final Matcher matcher = URL_PATTERN.matcher(text);
-
- while (matcher.find()) {
- res.add(new Link(matcher.start(), matcher.end(), matcher.group()));
- }
-
- return res;
- }
-
- }
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