Class TestSpecParser

tests/catch.h:3250–3334

namespace Catch {

    class TestSpecParser {
        enum Mode{ None, Name, QuotedName, Tag };
        Mode m_mode;
        bool m_exclusion;
        std::size_t m_start, m_pos;
        std::string m_arg;
        TestSpec::Filter m_currentFilter;
        TestSpec m_testSpec;
        ITagAliasRegistry const* m_tagAliases;

    public:
        TestSpecParser( ITagAliasRegistry const& tagAliases ) : m_tagAliases( &tagAliases ) {}

        TestSpecParser& parse( std::string const& arg ) {
            m_mode = None;
            m_exclusion = false;
            m_start = std::string::npos;
            m_arg = m_tagAliases->expandAliases( arg );
            for( m_pos = 0; m_pos < m_arg.size(); ++m_pos )
                visitChar( m_arg[m_pos] );
            if( m_mode == Name )
                addPattern<TestSpec::NamePattern>();
            return *this;
        }
        TestSpec testSpec() {
            addFilter();
            return m_testSpec;
        }
    private:
        void visitChar( char c ) {
            if( m_mode == None ) {
                switch( c ) {
                case ' ': return;
                case '~': m_exclusion = true; return;
                case '[': return startNewMode( Tag, ++m_pos );
                case '"': return startNewMode( QuotedName, ++m_pos );
                default: startNewMode( Name, m_pos ); break;
                }
            }
            if( m_mode == Name ) {
                if( c == ',' ) {
                    addPattern<TestSpec::NamePattern>();
                    addFilter();
                }
                else if( c == '[' ) {
                    if( subString() == "exclude:" )
                        m_exclusion = true;
                    else
                        addPattern<TestSpec::NamePattern>();
                    startNewMode( Tag, ++m_pos );
                }
            }
            else if( m_mode == QuotedName && c == '"' )
                addPattern<TestSpec::NamePattern>();
            else if( m_mode == Tag && c == ']' )
                addPattern<TestSpec::TagPattern>();
        }
        void startNewMode( Mode mode, std::size_t start ) {