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logging/filter: Use std::string_view in ParseFilterString()
Allows avoiding constructing std::string instances, since this only reads an arbitrary sequence of characters. We can also make ParseFilterRule() internal, since it doesn't depend on any private instance state of Filter
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@ -8,39 +8,9 @@
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#include "common/string_util.h"
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namespace Log {
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Filter::Filter(Level default_level) {
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ResetAll(default_level);
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}
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void Filter::ResetAll(Level level) {
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class_levels.fill(level);
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}
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void Filter::SetClassLevel(Class log_class, Level level) {
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class_levels[static_cast<size_t>(log_class)] = level;
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}
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void Filter::ParseFilterString(const std::string& filter_str) {
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auto clause_begin = filter_str.cbegin();
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while (clause_begin != filter_str.cend()) {
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auto clause_end = std::find(clause_begin, filter_str.cend(), ' ');
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// If clause isn't empty
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if (clause_end != clause_begin) {
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ParseFilterRule(clause_begin, clause_end);
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}
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if (clause_end != filter_str.cend()) {
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// Skip over the whitespace
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++clause_end;
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}
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clause_begin = clause_end;
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}
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}
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namespace {
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template <typename It>
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static Level GetLevelByName(const It begin, const It end) {
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Level GetLevelByName(const It begin, const It end) {
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for (u8 i = 0; i < static_cast<u8>(Level::Count); ++i) {
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const char* level_name = GetLevelName(static_cast<Level>(i));
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if (Common::ComparePartialString(begin, end, level_name)) {
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@ -51,7 +21,7 @@ static Level GetLevelByName(const It begin, const It end) {
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}
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template <typename It>
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static Class GetClassByName(const It begin, const It end) {
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Class GetClassByName(const It begin, const It end) {
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for (ClassType i = 0; i < static_cast<ClassType>(Class::Count); ++i) {
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const char* level_name = GetLogClassName(static_cast<Class>(i));
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if (Common::ComparePartialString(begin, end, level_name)) {
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@ -61,8 +31,8 @@ static Class GetClassByName(const It begin, const It end) {
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return Class::Count;
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}
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bool Filter::ParseFilterRule(const std::string::const_iterator begin,
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const std::string::const_iterator end) {
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template <typename Iterator>
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bool ParseFilterRule(Filter& instance, Iterator begin, Iterator end) {
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auto level_separator = std::find(begin, end, ':');
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if (level_separator == end) {
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LOG_ERROR(Log, "Invalid log filter. Must specify a log level after `:`: {}",
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@ -77,7 +47,7 @@ bool Filter::ParseFilterRule(const std::string::const_iterator begin,
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}
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if (Common::ComparePartialString(begin, level_separator, "*")) {
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ResetAll(level);
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instance.ResetAll(level);
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return true;
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}
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@ -87,9 +57,40 @@ bool Filter::ParseFilterRule(const std::string::const_iterator begin,
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return false;
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}
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SetClassLevel(log_class, level);
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instance.SetClassLevel(log_class, level);
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return true;
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}
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} // Anonymous namespace
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Filter::Filter(Level default_level) {
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ResetAll(default_level);
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}
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void Filter::ResetAll(Level level) {
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class_levels.fill(level);
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}
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void Filter::SetClassLevel(Class log_class, Level level) {
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class_levels[static_cast<size_t>(log_class)] = level;
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}
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void Filter::ParseFilterString(std::string_view filter_view) {
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auto clause_begin = filter_view.cbegin();
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while (clause_begin != filter_view.cend()) {
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auto clause_end = std::find(clause_begin, filter_view.cend(), ' ');
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// If clause isn't empty
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if (clause_end != clause_begin) {
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ParseFilterRule(*this, clause_begin, clause_end);
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}
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if (clause_end != filter_view.cend()) {
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// Skip over the whitespace
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++clause_end;
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}
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clause_begin = clause_end;
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}
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}
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bool Filter::CheckMessage(Class log_class, Level level) const {
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return static_cast<u8>(level) >= static_cast<u8>(class_levels[static_cast<size_t>(log_class)]);
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@ -6,7 +6,7 @@
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#include <array>
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#include <cstddef>
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#include <string>
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#include <string_view>
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#include "common/logging/log.h"
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namespace Log {
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@ -40,9 +40,7 @@ public:
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* - `Service:Info` -- Sets the level of Service to Info.
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* - `Service.FS:Trace` -- Sets the level of the Service.FS class to Trace.
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*/
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void ParseFilterString(const std::string& filter_str);
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bool ParseFilterRule(const std::string::const_iterator start,
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const std::string::const_iterator end);
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void ParseFilterString(std::string_view filter_view);
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/// Matches class/level combination against the filter, returning true if it passed.
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bool CheckMessage(Class log_class, Level level) const;
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