File indexing completed on 2024-05-12 04:57:50

 /* ============================================================
 * Falkon - Qt web browser
 * Copyright (C) 2010-2017 David Rosca <nowrep@gmail.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * ============================================================ */
 /**
  * Copyright (c) 2009, Zsombor Gegesy <gzsombor@gmail.com>
  * Copyright (c) 2009, Benjamin C. Meyer <ben@meyerhome.net>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. 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.
  * 3. Neither the name of the Benjamin Meyer 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 REGENTS 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 REGENTS 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.
  */
 
 #include "adblockrule.h"
 #include "adblocksubscription.h"
 #include "qztools.h"
 
 #include <QUrl>
 #include <QString>
 #include <QWebEnginePage>
 #include <QWebEngineUrlRequestInfo>
 
 /* TODO Qt6 Replace with PUBLIC API */
 #include <QtCore/private/qurl_p.h>
 #include <QtNetwork/private/qtldurl_p.h>
 
 static QString getTopLevelDomain(const QUrl &url)
 {
     // QUrl::topLevelDomain() was removed in Qt6.
     // The following is copied from the old "qTopLevelDomain" code in Qt6::Network.
     // It was removed in this commit: https://github.com/qt/qtbase/commit/50b30976837be0969efdccced68cfb584d99981a
     const QString domainLower = url.host().toLower();
     QVector<QStringView> sections = QStringView{domainLower}.split(QLatin1Char('.'), Qt::SkipEmptyParts);
     if (sections.isEmpty())
         return QString();
 
     QString level, tld;
     for (int j = sections.count() - 1; j >= 0; --j) {
         level.prepend(QLatin1Char('.') + sections.at(j));
         if (qIsEffectiveTLD(QStringView{level}.right(level.size() - 1)))
             tld = level;
     }
 
     //return qt_ACE_do(tld, ToAceOnly, AllowLeadingDot, {});
     // TODO QT6 - QUrl::toAce() uses ForbidLeadingDot, while the old QUrl::topLevelDomain() used AllowLeadingDot. Does this matter?
     return QString(QString::fromUtf8(QUrl::toAce(tld)));
 }
 
 static QString toSecondLevelDomain(const QUrl &url)
 {
     const QString topLevelDomain = getTopLevelDomain(url);
     const QString urlHost = url.host();
 
     if (topLevelDomain.isEmpty() || urlHost.isEmpty()) {
         return {};
     }
 
     QString domain = urlHost.left(urlHost.size() - topLevelDomain.size());
 
     if (domain.count(QL1C('.')) == 0) {
         return urlHost;
     }
 
     while (domain.count(QL1C('.')) != 0) {
         domain = domain.mid(domain.indexOf(QL1C('.')) + 1);
     }
 
     return domain + topLevelDomain;
 }
 
 AdBlockRule::AdBlockRule(const QString &filter, AdBlockSubscription* subscription)
     : m_subscription(subscription)
     , m_type(StringContainsMatchRule)
     , m_caseSensitivity(Qt::CaseInsensitive)
     , m_isEnabled(true)
     , m_isException(false)
     , m_isInternalDisabled(false)
     , m_regExp(nullptr)
 {
     setFilter(filter);
 }
 
 AdBlockRule::~AdBlockRule()
 {
     delete m_regExp;
 }
 
 AdBlockRule* AdBlockRule::copy() const
 {
     auto* rule = new AdBlockRule();
     rule->m_subscription = m_subscription;
     rule->m_type = m_type;
     rule->m_options = m_options;
     rule->m_exceptions = m_exceptions;
     rule->m_filter = m_filter;
     rule->m_matchString = m_matchString;
     rule->m_caseSensitivity = m_caseSensitivity;
     rule->m_isEnabled = m_isEnabled;
     rule->m_isException = m_isException;
     rule->m_isInternalDisabled = m_isInternalDisabled;
     rule->m_allowedDomains = m_allowedDomains;
     rule->m_blockedDomains = m_blockedDomains;
 
     if (m_regExp) {
         rule->m_regExp = new RegExp;
         rule->m_regExp->regExp = m_regExp->regExp;
         rule->m_regExp->matchers = m_regExp->matchers;
     }
 
     return rule;
 }
 
 AdBlockSubscription* AdBlockRule::subscription() const
 {
     return m_subscription;
 }
 
 void AdBlockRule::setSubscription(AdBlockSubscription* subscription)
 {
     m_subscription = subscription;
 }
 
 QString AdBlockRule::filter() const
 {
     return m_filter;
 }
 
 void AdBlockRule::setFilter(const QString &filter)
 {
     m_filter = filter;
     parseFilter();
 }
 
 bool AdBlockRule::isCssRule() const
 {
     return m_type == CssRule;
 }
 
 QString AdBlockRule::cssSelector() const
 {
     return m_matchString;
 }
 
 bool AdBlockRule::isUnsupportedRule() const
 {
     return m_type == ExtendedCssRule || m_type == SnippetRule || m_isInternalDisabled;
 }
 
 bool AdBlockRule::isDocument() const
 {
     return hasOption(DocumentOption);
 }
 
 bool AdBlockRule::isElemhide() const
 {
     return hasOption(ElementHideOption);
 }
 
 bool AdBlockRule::isGenerichide() const
 {
     return hasOption(GenericHideOption);
 }
 
 bool AdBlockRule::isDomainRestricted() const
 {
     return hasOption(DomainRestrictedOption);
 }
 
 bool AdBlockRule::isException() const
 {
     return m_isException;
 }
 
 bool AdBlockRule::isComment() const
 {
     return m_filter.startsWith(QL1C('!'));
 }
 
 bool AdBlockRule::isEnabled() const
 {
     return m_isEnabled;
 }
 
 void AdBlockRule::setEnabled(bool enabled)
 {
     m_isEnabled = enabled;
 }
 
 bool AdBlockRule::isSlow() const
 {
     return m_regExp != nullptr;
 }
 
 bool AdBlockRule::isInternalDisabled() const
 {
     return m_isInternalDisabled;
 }
 
 bool AdBlockRule::urlMatch(const QUrl &url) const
 {
     if (!hasOption(DocumentOption) && !hasOption(ElementHideOption) && !hasOption(GenericHideOption) && !hasOption(GenericBlockOption)) {
         return false;
     }
 
     const QString encodedUrl = QString::fromUtf8(url.toEncoded());
     const QString domain = url.host();
 
     return stringMatch(domain, encodedUrl);
 }
 
 bool AdBlockRule::networkMatch(const QWebEngineUrlRequestInfo &request, const QString &domain, const QString &encodedUrl) const
 {
     if (m_type == CssRule || !m_isEnabled || m_isInternalDisabled) {
         return false;
     }
 
     bool matched = stringMatch(domain, encodedUrl);
 
     if (matched) {
         // Check domain restrictions
         if (hasOption(DomainRestrictedOption) && !matchDomain(request.firstPartyUrl().host())) {
             return false;
         }
 
         // Check third-party restriction
         if (hasOption(ThirdPartyOption) && !matchThirdParty(request)) {
             return false;
         }
 
         // Check type restrictions
         if (((m_exceptions | m_options) & TypeOptions) && !matchType(request))
             return false;
     }
 
     return matched;
 }
 
 bool AdBlockRule::matchDomain(const QString &domain) const
 {
     if (!m_isEnabled) {
         return false;
     }
 
     if (!hasOption(DomainRestrictedOption)) {
         return true;
     }
 
     if (m_blockedDomains.isEmpty()) {
         for (const QString &d : std::as_const(m_allowedDomains)) {
             if (isMatchingDomain(domain, d)) {
                 return true;
             }
         }
     }
     else if (m_allowedDomains.isEmpty()) {
         for (const QString &d : std::as_const(m_blockedDomains)) {
             if (isMatchingDomain(domain, d)) {
                 return false;
             }
         }
         return true;
     }
     else {
         for (const QString &d : std::as_const(m_blockedDomains)) {
             if (isMatchingDomain(domain, d)) {
                 return false;
             }
         }
 
         for (const QString &d : std::as_const(m_allowedDomains)) {
             if (isMatchingDomain(domain, d)) {
                 return true;
             }
         }
     }
 
     return false;
 }
 
 bool AdBlockRule::matchThirdParty(const QWebEngineUrlRequestInfo &request) const
 {
     // Third-party matching should be performed on second-level domains
     const QString firstPartyHost = toSecondLevelDomain(request.firstPartyUrl());
     const QString host = toSecondLevelDomain(request.requestUrl());
 
     bool match = firstPartyHost != host;
 
     return hasException(ThirdPartyOption) ? !match : match;
 }
 
 bool AdBlockRule::matchType(const QWebEngineUrlRequestInfo &request) const
 {
     RuleOption type;
     switch (request.resourceType()) {
     case QWebEngineUrlRequestInfo::ResourceTypeMainFrame:
         type = DocumentOption;
         break;
     case QWebEngineUrlRequestInfo::ResourceTypeSubFrame:
         type = SubdocumentOption;
         break;
     case QWebEngineUrlRequestInfo::ResourceTypeStylesheet:
         type = StyleSheetOption;
         break;
     case QWebEngineUrlRequestInfo::ResourceTypeScript:
         type = ScriptOption;
         break;
     case QWebEngineUrlRequestInfo::ResourceTypeImage:
         type = ImageOption;
         break;
     case QWebEngineUrlRequestInfo::ResourceTypeFontResource:
         type = FontOption;
         break;
     case QWebEngineUrlRequestInfo::ResourceTypeObject:
         type = ObjectOption;
         break;
     case QWebEngineUrlRequestInfo::ResourceTypeMedia:
         type = MediaOption;
         break;
     case QWebEngineUrlRequestInfo::ResourceTypeXhr:
         type = XMLHttpRequestOption;
         break;
     case QWebEngineUrlRequestInfo::ResourceTypePing:
         type = PingOption;
         break;
     case QWebEngineUrlRequestInfo::ResourceTypePluginResource:
         type = ObjectSubrequestOption;
         break;
     case QWebEngineUrlRequestInfo::ResourceTypeSubResource:
     case QWebEngineUrlRequestInfo::ResourceTypeWorker:
     case QWebEngineUrlRequestInfo::ResourceTypeSharedWorker:
     case QWebEngineUrlRequestInfo::ResourceTypePrefetch:
     case QWebEngineUrlRequestInfo::ResourceTypeFavicon:
     case QWebEngineUrlRequestInfo::ResourceTypeServiceWorker:
     case QWebEngineUrlRequestInfo::ResourceTypeCspReport:
     case QWebEngineUrlRequestInfo::ResourceTypeNavigationPreloadMainFrame:
     case QWebEngineUrlRequestInfo::ResourceTypeNavigationPreloadSubFrame:
     case QWebEngineUrlRequestInfo::ResourceTypeUnknown:
     default:
         type = OtherOption;
         break;
     }
     if (!m_exceptions)
         return m_options.testFlag(type);
     return !m_exceptions.testFlag(type);
 }
 
 void AdBlockRule::parseFilter()
 {
     QString parsedLine = m_filter;
 
     // Empty rule or just comment
     if (m_filter.trimmed().isEmpty() || m_filter.startsWith(QL1C('!'))) {
         // We want to differentiate rule disabled by user and rule disabled in subscription file
         // m_isInternalDisabled is also used when rule is disabled due to all options not being supported
         m_isEnabled = false;
         m_isInternalDisabled = true;
         m_type = Invalid;
         return;
     }
 
     // Exception always starts with @@
     if (parsedLine.startsWith(QL1S("@@"))) {
         m_isException = true;
         parsedLine.remove(0, 2);
     }
 
     // Extended CSS element hiding
     if (parsedLine.contains(QL1S("#?#"))) {
         m_type = ExtendedCssRule;
         int pos = parsedLine.indexOf(QL1C('#'));
         if (!parsedLine.startsWith(QL1S("#"))) {
             QString domains = parsedLine.left(pos);
             parseDomains(domains, QL1C(','));
         }
         m_matchString = parsedLine.mid(pos + 3);
         // CSS rule cannot have more options -> stop parsing
         return;
     }
 
     // Snippet rule
     if (parsedLine.contains(QL1S("#$#"))) {
         m_type = SnippetRule;
         int pos = parsedLine.indexOf(QL1C('#'));
         if (!parsedLine.startsWith(QL1S("#"))) {
             QString domains = parsedLine.left(pos);
             parseDomains(domains, QL1C(','));
         }
         m_matchString = parsedLine.mid(pos + 3);
         return;
     }
 
     // CSS Element hiding rule
     if (parsedLine.contains(QL1S("##")) || parsedLine.contains(QL1S("#@#"))) {
         m_type = CssRule;
         int pos = parsedLine.indexOf(QL1C('#'));
 
         // Domain restricted rule
         if (!parsedLine.startsWith(QL1S("#"))) {
             QString domains = parsedLine.left(pos);
             parseDomains(domains, QL1C(','));
         }
 
         m_isException = parsedLine.at(pos + 1) == QL1C('@');
         m_matchString = parsedLine.mid(m_isException ? pos + 3 : pos + 2);
 
         // CSS rule cannot have more options -> stop parsing
         return;
     }
 
     // Parse all options following $ char
     int optionsIndex = parsedLine.indexOf(QL1C('$'));
     if (optionsIndex >= 0) {
         const QStringList options = parsedLine.mid(optionsIndex + 1).split(QL1C(','), Qt::SkipEmptyParts);
 
         int handledOptions = 0;
         for (const QString &option : options) {
             if (option.startsWith(QL1S("domain="))) {
                 parseDomains(option.mid(7), QL1C('|'));
                 ++handledOptions;
             }
             else if (option == QL1S("match-case")) {
                 m_caseSensitivity = Qt::CaseSensitive;
                 ++handledOptions;
             }
             else if (option.endsWith(QL1S("third-party"))) {
                 setOption(ThirdPartyOption);
                 setException(ThirdPartyOption, option.startsWith(QL1C('~')));
                 ++handledOptions;
             }
             else if (option.endsWith(QL1S("object"))) {
                 setOption(ObjectOption);
                 setException(ObjectOption, option.startsWith(QL1C('~')));
                 ++handledOptions;
             }
             else if (option.endsWith(QL1S("subdocument"))) {
                 setOption(SubdocumentOption);
                 setException(SubdocumentOption, option.startsWith(QL1C('~')));
                 ++handledOptions;
             }
             else if (option.endsWith(QL1S("xmlhttprequest"))) {
                 setOption(XMLHttpRequestOption);
                 setException(XMLHttpRequestOption, option.startsWith(QL1C('~')));
                 ++handledOptions;
             }
             else if (option.endsWith(QL1S("image"))) {
                 setOption(ImageOption);
                 setException(ImageOption, option.startsWith(QL1C('~')));
                 ++handledOptions;
             }
             else if (option.endsWith(QL1S("script"))) {
                 setOption(ScriptOption);
                 setException(ScriptOption, option.startsWith(QL1C('~')));
                 ++handledOptions;
             }
             else if (option.endsWith(QL1S("stylesheet"))) {
                 setOption(StyleSheetOption);
                 setException(StyleSheetOption, option.startsWith(QL1C('~')));
                 ++handledOptions;
             }
             else if (option.endsWith(QL1S("object-subrequest"))) {
                 setOption(ObjectSubrequestOption);
                 setException(ObjectSubrequestOption, option.startsWith(QL1C('~')));
                 ++handledOptions;
             }
             else if (option.endsWith(QL1S("ping"))) {
                 setOption(PingOption);
                 setException(PingOption, option.startsWith(QL1C('~')));
                 ++handledOptions;
             }
             else if (option.endsWith(QL1S("media"))) {
                 setOption(MediaOption);
                 setException(MediaOption, option.startsWith(QL1C('~')));
                 ++handledOptions;
             }
             else if (option.endsWith(QL1S("font"))) {
                 setOption(FontOption);
                 setException(FontOption, option.startsWith(QL1C('~')));
                 ++handledOptions;
             }
             else if (option.endsWith(QL1S("other"))) {
                 setOption(OtherOption);
                 setException(OtherOption, option.startsWith(QL1C('~')));
                 ++handledOptions;
             }
             else if (option == QL1S("collapse")) {
                 // Hiding placeholders of blocked elements is enabled by default
                 ++handledOptions;
             }
             else if (option == QL1S("popup")) {
                 // doesn't do anything yet
                 setOption(PopupOption);
                 ++handledOptions;
             }
             else if (option == QL1S("document") && m_isException) {
                 setOption(DocumentOption);
                 ++handledOptions;
             }
             else if (option == QL1S("elemhide") && m_isException) {
                 setOption(ElementHideOption);
                 ++handledOptions;
             }
             else if (option == QL1S("generichide") && m_isException) {
                 setOption(GenericHideOption);
                 ++handledOptions;
             }
             else if (option == QL1S("genericblock") && m_isException) {
                 // doesn't do anything yet
                 setOption(GenericBlockOption);
 //                 ++handledOptions;
             }
         }
 
         // If we don't handle all options, it's safer to just disable this rule
         if (handledOptions != options.count()) {
             m_isInternalDisabled = true;
             m_type = Invalid;
             return;
         }
 
         parsedLine.truncate(optionsIndex);
     }
 
     // Rule is classic regexp
     if (parsedLine.startsWith(QL1C('/')) && parsedLine.endsWith(QL1C('/'))) {
         parsedLine.remove(0, 1);
         parsedLine = parsedLine.left(parsedLine.size() - 1);
 
         m_type = RegExpMatchRule;
         m_regExp = new RegExp;
         m_regExp->regExp = QRegularExpression(parsedLine, QRegularExpression::InvertedGreedinessOption);
         if (m_caseSensitivity == Qt::CaseInsensitive) {
             m_regExp->regExp.setPatternOptions(m_regExp->regExp.patternOptions() | QRegularExpression::CaseInsensitiveOption);
         }
         m_regExp->matchers = createStringMatchers(parseRegExpFilter(parsedLine));
         return;
     }
 
     // Remove starting and ending wildcards (*)
     if (parsedLine.startsWith(QL1C('*'))) {
         parsedLine.remove(0, 1);
     }
 
     if (parsedLine.endsWith(QL1C('*'))) {
         parsedLine = parsedLine.left(parsedLine.size() - 1);
     }
 
     // We can use fast string matching for domain here
     if (filterIsOnlyDomain(parsedLine)) {
         parsedLine.remove(0, 2);
         parsedLine = parsedLine.left(parsedLine.size() - 1);
 
         m_type = DomainMatchRule;
         m_matchString = parsedLine;
         return;
     }
 
     // If rule contains only | at end, we can also use string matching
     if (filterIsOnlyEndsMatch(parsedLine)) {
         parsedLine = parsedLine.left(parsedLine.size() - 1);
 
         m_type = StringEndsMatchRule;
         m_matchString = parsedLine;
         return;
     }
 
     // If we still find a wildcard (*) or separator (^) or (|)
     // we must modify parsedLine to comply with QRegularExpression
     if (parsedLine.contains(QL1C('*')) ||
         parsedLine.contains(QL1C('^')) ||
         parsedLine.contains(QL1C('|'))
        ) {
         m_type = RegExpMatchRule;
         m_regExp = new RegExp;
         m_regExp->regExp = QRegularExpression(createRegExpFromFilter(parsedLine), QRegularExpression::InvertedGreedinessOption);
         if (m_caseSensitivity == Qt::CaseInsensitive) {
             m_regExp->regExp.setPatternOptions(m_regExp->regExp.patternOptions() | QRegularExpression::CaseInsensitiveOption);
         }
         m_regExp->matchers = createStringMatchers(parseRegExpFilter(parsedLine));
         return;
     }
 
     // This rule matches all urls
     if (parsedLine.isEmpty()) {
         if (m_options == NoOption) {
             qWarning() << "Disabling unrestricted rule that would block all requests" << m_filter;
             m_isInternalDisabled = true;
             m_type = Invalid;
             return;
         }
         m_type = MatchAllUrlsRule;
         return;
     }
 
     // We haven't found anything that needs use of regexp, yay!
     m_type = StringContainsMatchRule;
     m_matchString = parsedLine;
 }
 
 void AdBlockRule::parseDomains(const QString &domains, const QChar &separator)
 {
     const QStringList domainsList = domains.split(separator, Qt::SkipEmptyParts);
 
     for (const QString &domain : domainsList) {
         if (domain.isEmpty()) {
             continue;
         }
         if (domain.startsWith(QL1C('~'))) {
             m_blockedDomains.append(domain.mid(1));
         }
         else {
             m_allowedDomains.append(domain);
         }
     }
 
     if (!m_blockedDomains.isEmpty() || !m_allowedDomains.isEmpty()) {
         setOption(DomainRestrictedOption);
     }
 }
 
 bool AdBlockRule::filterIsOnlyDomain(const QString &filter) const
 {
     if (!filter.endsWith(QL1C('^')) || !filter.startsWith(QL1S("||")))
         return false;
 
     for (int i = 0; i < filter.size(); ++i) {
         switch (filter.at(i).toLatin1()) {
         case '/':
         case ':':
         case '?':
         case '=':
         case '&':
         case '*':
             return false;
         default:
             break;
         }
     }
 
     return true;
 }
 
 bool AdBlockRule::filterIsOnlyEndsMatch(const QString &filter) const
 {
     for (int i = 0; i < filter.size(); ++i) {
         switch (filter.at(i).toLatin1()) {
         case '^':
         case '*':
             return false;
         case '|':
             return i == filter.size() - 1;
         default:
             break;
         }
     }
 
     return false;
 }
 
 static bool wordCharacter(const QChar &c)
 {
     return c.isLetterOrNumber() || c.isMark() || c == QL1C('_');
 }
 
 QString AdBlockRule::createRegExpFromFilter(const QString &filter) const
 {
     QString parsed;
     parsed.reserve(filter.size());
 
     bool hadWildcard = false; // Filter multiple wildcards
 
     for (int i = 0; i < filter.size(); ++i) {
         const QChar c = filter.at(i);
         switch (c.toLatin1()) {
         case '^':
             parsed.append(QL1S("(?:[^\\w\\d\\-.%]|$)"));
             break;
 
         case '*':
             if (!hadWildcard)
                 parsed.append(QL1S(".*"));
             break;
 
         case '|':
             if (i == 0) {
                 if (filter.size() > 1 && filter.at(1) == QL1C('|')) {
                     parsed.append(QL1S("^[\\w\\-]+:\\/+(?!\\/)(?:[^\\/]+\\.)?"));
                     i++;
                 }
                 else {
                     parsed.append(QL1C('^'));
                 }
                 break;
             }
             else if (i == filter.size() - 1) {
                 parsed.append(QL1C('$'));
                 break;
             }
             // fallthrough
 
         default:
             if (!wordCharacter(c))
                 parsed.append(QL1C('\\') + c);
             else
                 parsed.append(c);
         }
 
         hadWildcard = c == QL1C('*');
     }
 
     return parsed;
 }
 
 QList<QStringMatcher> AdBlockRule::createStringMatchers(const QStringList &filters) const
 {
     QList<QStringMatcher> matchers;
     matchers.reserve(filters.size());
 
     for (const QString &filter : filters) {
         matchers.append(QStringMatcher(filter, m_caseSensitivity));
     }
 
     return matchers;
 }
 
 bool AdBlockRule::stringMatch(const QString &domain, const QString &encodedUrl) const
 {
     switch (m_type) {
     case StringContainsMatchRule:
         return encodedUrl.contains(m_matchString, m_caseSensitivity);
 
     case DomainMatchRule:
         return isMatchingDomain(domain, m_matchString);
 
     case StringEndsMatchRule:
         return encodedUrl.endsWith(m_matchString, m_caseSensitivity);
 
     case RegExpMatchRule:
         if (!isMatchingRegExpStrings(encodedUrl)) {
             return false;
         }
         return m_regExp->regExp.match(encodedUrl).hasMatch();
 
     case MatchAllUrlsRule:
         return true;
 
     default:
         return false;
     }
 }
 
 bool AdBlockRule::isMatchingDomain(const QString &domain, const QString &filter) const
 {
     return QzTools::matchDomain(filter, domain);
 }
 
 bool AdBlockRule::isMatchingRegExpStrings(const QString &url) const
 {
     Q_ASSERT(m_regExp);
 
     const auto matchers = m_regExp->matchers;
     for (const QStringMatcher &matcher : matchers) {
         if (matcher.indexIn(url) == -1)
             return false;
     }
 
     return true;
 }
 
 // Split regexp filter into strings that can be used with QString::contains
 // Don't use parts that contains only 1 char and duplicated parts
 QStringList AdBlockRule::parseRegExpFilter(const QString &filter) const
 {
     QStringList list;
     int startPos = -1;
 
     for (int i = 0; i < filter.size(); ++i) {
         const QChar c = filter.at(i);
         // Meta characters in AdBlock rules are | * ^
         if (c == QL1C('|') || c == QL1C('*') || c == QL1C('^')) {
             const QString sub = filter.mid(startPos, i - startPos);
             if (sub.size() > 1)
                 list.append(sub);
             startPos = i + 1;
         }
     }
 
     const QString sub = filter.mid(startPos);
     if (sub.size() > 1)
         list.append(sub);
 
     list.removeDuplicates();
 
     return list;
 }
 
 bool AdBlockRule::hasOption(const AdBlockRule::RuleOption &opt) const
 {
     return (m_options & opt);
 }
 
 bool AdBlockRule::hasException(const AdBlockRule::RuleOption &opt) const
 {
     return (m_exceptions & opt);
 }
 
 void AdBlockRule::setOption(const AdBlockRule::RuleOption &opt)
 {
     m_options |= opt;
 }
 
 void AdBlockRule::setException(const AdBlockRule::RuleOption &opt, bool on)
 {
     if (on) {
         m_exceptions |= opt;
     }
 }