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AdBlock: Improved string performance when parsing rules

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- using QLatin1String and QLatin1Char
This commit is contained in:
nowrep 2012-09-04 11:24:41 +02:00
parent 7b21bf61f1
commit 40a335bc1f
2 changed files with 40 additions and 37 deletions
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75
src/lib/adblock/adblockrule.cpp
View File

@ -70,24 +70,24 @@ QString toSecondLevelDomain(const QUrl &url)
QString domain = urlHost.left(urlHost.size() - topLevelDomain.size());
if (domain.count('.') == 0) {
if (domain.count(QLatin1Char('.')) == 0) {
return urlHost;
}
while (domain.count('.') != 0) {
domain = domain.mid(domain.indexOf('.') + 1);
while (domain.count(QLatin1Char('.')) != 0) {
domain = domain.mid(domain.indexOf(QLatin1Char('.')) + 1);
}
return domain + topLevelDomain;
#else
QString domain = url.host();
if (domain.count('.') == 0) {
if (domain.count(QLatin1Char('.')) == 0) {
return QString();
}
while (domain.count('.') != 1) {
domain = domain.mid(domain.indexOf('.') + 1);
while (domain.count(QLatin1Char('.')) != 1) {
domain = domain.mid(domain.indexOf(QLatin1Char('.')) + 1);
}
return domain;
@ -319,7 +319,7 @@ bool AdBlockRule::matchThirdParty(const QNetworkRequest &request) const
bool AdBlockRule::matchObject(const QNetworkRequest &request) const
{
bool match = request.attribute(QNetworkRequest::Attribute(QNetworkRequest::User + 150)).toString() == QString("object");
bool match = request.attribute(QNetworkRequest::Attribute(QNetworkRequest::User + 150)).toString() == QLatin1String("object");
return m_objectException ? !match : match;
}
@ -353,20 +353,20 @@ void AdBlockRule::parseFilter()
QString parsedLine = m_filter;
// Empty rule or just comment
if (m_filter.trimmed().isEmpty() || m_filter.startsWith('!')) {
if (m_filter.trimmed().isEmpty() || m_filter.startsWith(QLatin1Char('!'))) {
m_enabled = false;
return;
}
// CSS Element hiding rule
if (parsedLine.contains("##")) {
if (parsedLine.contains(QLatin1String("##"))) {
m_cssRule = true;
int pos = parsedLine.indexOf("##");
int pos = parsedLine.indexOf(QLatin1String("##"));
// Domain restricted rule
if (!parsedLine.startsWith("##")) {
if (!parsedLine.startsWith(QLatin1String("##"))) {
QString domains = parsedLine.left(pos);
parseDomains(domains, ',');
parseDomains(domains, QLatin1Char(','));
}
m_cssSelector = parsedLine.mid(pos + 2);
@ -375,55 +375,55 @@ void AdBlockRule::parseFilter()
}
// Exception always starts with @@
if (parsedLine.startsWith("@@")) {
if (parsedLine.startsWith(QLatin1String("@@"))) {
m_exception = true;
parsedLine = parsedLine.mid(2);
}
// Parse all options following $ char
int optionsIndex = parsedLine.indexOf('$');
int optionsIndex = parsedLine.indexOf(QLatin1Char('$'));
if (optionsIndex >= 0) {
QStringList options = parsedLine.mid(optionsIndex + 1).split(',');
QStringList options = parsedLine.mid(optionsIndex + 1).split(QLatin1Char(','));
int handledOptions = 0;
foreach(const QString & option, options) {
if (option.startsWith("domain=")) {
parseDomains(option.mid(7), '|');
if (option.startsWith(QLatin1String("domain="))) {
parseDomains(option.mid(7), QLatin1Char('|'));
++handledOptions;
}
else if (option == "match-case") {
else if (option == QLatin1String("match-case")) {
m_caseSensitivity = Qt::CaseSensitive;
++handledOptions;
}
else if (option.endsWith("third-party")) {
else if (option.endsWith(QLatin1String("third-party"))) {
m_thirdParty = true;
m_thirdPartyException = option.startsWith('~');
m_thirdPartyException = option.startsWith(QLatin1Char('~'));
++handledOptions;
}
else if (option.endsWith("object")) {
else if (option.endsWith(QLatin1String("object"))) {
m_object = true;
m_objectException = option.startsWith('~');
m_objectException = option.startsWith(QLatin1Char('~'));
++handledOptions;
}
else if (option.endsWith("subdocument")) {
else if (option.endsWith(QLatin1String("subdocument"))) {
m_subdocument = true;
m_subdocumentException = option.startsWith('~');
++handledOptions;
}
else if (option.endsWith("xmlhttprequest")) {
else if (option.endsWith(QLatin1String("xmlhttprequest"))) {
m_xmlhttprequest = true;
m_xmlhttprequestException = option.startsWith('~');
m_xmlhttprequestException = option.startsWith(QLatin1Char('~'));
++handledOptions;
}
else if (option == "document" && m_exception) {
else if (option == QLatin1String("document") && m_exception) {
m_document = true;
++handledOptions;
}
else if (option == "elemhide" && m_exception) {
else if (option == QLatin1String("elemhide") && m_exception) {
m_elemhide = true;
++handledOptions;
}
else if (option == "collapse") {
else if (option == QLatin1String("collapse")) {
// Hiding placeholders of blocked elements
++handledOptions;
}
@ -439,7 +439,7 @@ void AdBlockRule::parseFilter()
}
// Rule is classic regexp
if (parsedLine.startsWith('/') && parsedLine.endsWith('/')) {
if (parsedLine.startsWith(QLatin1Char('/')) && parsedLine.endsWith(QLatin1Char('/'))) {
parsedLine = parsedLine.mid(1);
parsedLine = parsedLine.left(parsedLine.size() - 1);
@ -449,16 +449,17 @@ void AdBlockRule::parseFilter()
}
// Remove starting and ending wildcards (*)
if (parsedLine.startsWith('*')) {
if (parsedLine.startsWith(QLatin1Char('*'))) {
parsedLine = parsedLine.mid(1);
}
if (parsedLine.endsWith('*')) {
if (parsedLine.endsWith(QLatin1Char('*'))) {
parsedLine = parsedLine.left(parsedLine.size() - 1);
}
// We can use fast string matching for domain here
if (parsedLine.startsWith("||") && parsedLine.endsWith('^') && !parsedLine.contains(QRegExp("[/:?=&\\*]"))) {
if (parsedLine.startsWith(QLatin1String("||")) && parsedLine.endsWith(QLatin1Char('^'))
&& !parsedLine.contains(QRegExp("[/:?=&\\*]"))) {
parsedLine = parsedLine.mid(2);
parsedLine = parsedLine.left(parsedLine.size() - 1);
@ -468,7 +469,8 @@ void AdBlockRule::parseFilter()
}
// If rule contains only | at end, we can also use string matching
if (parsedLine.endsWith('|') && !parsedLine.contains(QRegExp("[\\^\\*]")) && parsedLine.count('|') == 1) {
if (parsedLine.endsWith(QLatin1Char('|')) && !parsedLine.contains(QRegExp("[\\^\\*]"))
&& parsedLine.count(QLatin1Char('|')) == 1) {
parsedLine = parsedLine.left(parsedLine.size() - 1);
m_useEndsMatch = true;
@ -478,7 +480,8 @@ void AdBlockRule::parseFilter()
// If we still find a wildcard (*) or separator (^) or (|)
// we must modify parsedLine to comply with QRegExp
if (parsedLine.contains('*') || parsedLine.contains('^') || parsedLine.contains('|')) {
if (parsedLine.contains(QLatin1Char('*')) || parsedLine.contains(QLatin1Char('^'))
|| parsedLine.contains(QLatin1Char('|'))) {
parsedLine.replace(QRegExp(QLatin1String("\\*+")), QLatin1String("*")) // remove multiple wildcards
.replace(QRegExp(QLatin1String("\\^\\|$")), QLatin1String("^")) // remove anchors following separator placeholder
.replace(QRegExp(QLatin1String("^(\\*)")), QString()) // remove leading wildcards
@ -529,9 +532,9 @@ bool AdBlockRule::_matchDomain(const QString &domain, const QString &filter) con
int index = domain.indexOf(filter);
if (index == 0 || filter[0] == '.') {
if (index == 0 || filter[0] == QLatin1Char('.')) {
return true;
}
return domain[index - 1] == '.';
return domain[index - 1] == QLatin1Char('.');
}

2
src/lib/adblock/adblocksubscription.cpp
View File

@ -248,7 +248,7 @@ QString AdBlockSubscription::elementHidingRulesForDomain(const QString &domain)
for (int i = 0; i < count; ++i) {
const AdBlockRule* rule = m_domainRestrictedCssRules.at(i);
if (rule->matchDomain(domain)) {
rules.append(rule->cssSelector() + ",");
rules.append(rule->cssSelector() + QLatin1Char(','));
}
}