/** * @file llurlregistry.cpp * @author Martin Reddy * @brief Contains a set of Url types that can be matched in a string * * $LicenseInfo:firstyear=2009&license=viewerlgpl$ * Second Life Viewer Source Code * Copyright (C) 2010, Linden Research, Inc. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; * version 2.1 of the License only. * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * * Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA * $/LicenseInfo$ */ #include "linden_common.h" #include "llurlregistry.h" #include <boost/regex.hpp> // default dummy callback that ignores any label updates from the server void LLUrlRegistryNullCallback(const std::string &url, const std::string &label) { } LLUrlRegistry::LLUrlRegistry() { // Urls are matched in the order that they were registered registerUrl(new LLUrlEntryNoLink()); registerUrl(new LLUrlEntryIcon()); registerUrl(new LLUrlEntrySLURL()); registerUrl(new LLUrlEntryHTTP()); registerUrl(new LLUrlEntryHTTPLabel()); registerUrl(new LLUrlEntryAgent()); registerUrl(new LLUrlEntryGroup()); registerUrl(new LLUrlEntryParcel()); registerUrl(new LLUrlEntryTeleport()); registerUrl(new LLUrlEntryWorldMap()); registerUrl(new LLUrlEntryObjectIM()); registerUrl(new LLUrlEntryPlace()); registerUrl(new LLUrlEntryInventory()); registerUrl(new LLUrlEntryObjectIM()); //LLUrlEntrySL and LLUrlEntrySLLabel have more common pattern, //so it should be registered in the end of list registerUrl(new LLUrlEntrySL()); registerUrl(new LLUrlEntrySLLabel()); // most common pattern is a URL without any protocol, // e.g., "secondlife.com" registerUrl(new LLUrlEntryHTTPNoProtocol()); } LLUrlRegistry::~LLUrlRegistry() { // free all of the LLUrlEntryBase objects we are holding std::vector<LLUrlEntryBase *>::iterator it; for (it = mUrlEntry.begin(); it != mUrlEntry.end(); ++it) { delete *it; } } void LLUrlRegistry::registerUrl(LLUrlEntryBase *url) { if (url) { mUrlEntry.push_back(url); } } static bool matchRegex(const char *text, boost::regex regex, U32 &start, U32 &end) { boost::cmatch result; bool found; // regex_search can potentially throw an exception, so check for it try { found = boost::regex_search(text, result, regex); } catch (std::runtime_error &) { return false; } if (! found) { return false; } // return the first/last character offset for the matched substring start = static_cast<U32>(result[0].first - text); end = static_cast<U32>(result[0].second - text) - 1; // we allow certain punctuation to terminate a Url but not match it, // e.g., "http://foo.com/." should just match "http://foo.com/" if (text[end] == '.' || text[end] == ',') { end--; } // ignore a terminating ')' when Url contains no matching '(' // see DEV-19842 for details else if (text[end] == ')' && std::string(text+start, end-start).find('(') == std::string::npos) { end--; } return true; } static bool stringHasUrl(const std::string &text) { // fast heuristic test for a URL in a string. This is used // to avoid lots of costly regex calls, BUT it needs to be // kept in sync with the LLUrlEntry regexes we support. return (text.find("://") != std::string::npos || text.find("www.") != std::string::npos || text.find(".com") != std::string::npos || text.find(".net") != std::string::npos || text.find(".edu") != std::string::npos || text.find(".org") != std::string::npos || text.find("<nolink>") != std::string::npos || text.find("<icon") != std::string::npos); } bool LLUrlRegistry::findUrl(const std::string &text, LLUrlMatch &match, const LLUrlLabelCallback &cb) { // avoid costly regexes if there is clearly no URL in the text if (! stringHasUrl(text)) { return false; } // find the first matching regex from all url entries in the registry U32 match_start = 0, match_end = 0; LLUrlEntryBase *match_entry = NULL; std::vector<LLUrlEntryBase *>::iterator it; for (it = mUrlEntry.begin(); it != mUrlEntry.end(); ++it) { LLUrlEntryBase *url_entry = *it; U32 start = 0, end = 0; if (matchRegex(text.c_str(), url_entry->getPattern(), start, end)) { // does this match occur in the string before any other match if (start < match_start || match_entry == NULL) { match_start = start; match_end = end; match_entry = url_entry; } } } // did we find a match? if so, return its details in the match object if (match_entry) { // fill in the LLUrlMatch object and return it std::string url = text.substr(match_start, match_end - match_start + 1); match.setValues(match_start, match_end, match_entry->getUrl(url), match_entry->getLabel(url, cb), match_entry->getTooltip(url), match_entry->getIcon(url), match_entry->getColor(), match_entry->getMenuName(), match_entry->getLocation(url), match_entry->isLinkDisabled(), match_entry->getID(url), match_entry->underlineOnHoverOnly(url)); return true; } return false; } bool LLUrlRegistry::findUrl(const LLWString &text, LLUrlMatch &match, const LLUrlLabelCallback &cb) { // boost::regex_search() only works on char or wchar_t // types, but wchar_t is only 2-bytes on Win32 (not 4). // So we use UTF-8 to make this work the same everywhere. std::string utf8_text = wstring_to_utf8str(text); if (findUrl(utf8_text, match, cb)) { // we cannot blindly return the start/end offsets from // the UTF-8 string because it is a variable-length // character encoding, so we need to update the start // and end values to be correct for the wide string. LLWString wurl = utf8str_to_wstring(match.getUrl()); S32 start = text.find(wurl); if (start == std::string::npos) { return false; } S32 end = start + wurl.size() - 1; match.setValues(start, end, match.getUrl(), match.getLabel(), match.getTooltip(), match.getIcon(), match.getColor(), match.getMenuName(), match.getLocation(), match.isLinkDisabled(), match.getID(), match.underlineOnHoverOnly()); return true; } return false; } bool LLUrlRegistry::hasUrl(const std::string &text) { LLUrlMatch match; return findUrl(text, match); } bool LLUrlRegistry::hasUrl(const LLWString &text) { LLUrlMatch match; return findUrl(text, match); } bool LLUrlRegistry::isUrl(const std::string &text) { LLUrlMatch match; if (findUrl(text, match)) { return (match.getStart() == 0 && match.getEnd() >= text.size()-1); } return false; } bool LLUrlRegistry::isUrl(const LLWString &text) { LLUrlMatch match; if (findUrl(text, match)) { return (match.getStart() == 0 && match.getEnd() >= text.size()-1); } return false; }