Поддержка Redis

src/myx/redis/lexer.cpp

@@ -0,0 +1,115 @@
+#include "lexer.hpp"
+
+using namespace qxredis;
+
+Lexer::Lexer( QIODevice* device, QObject* parent ) :
+	QObject ( parent ),
+	m_device( device ),
+	m_state ( DoingNothing ),
+	m_crlf  ( 0 ),
+	m_length( 0 )
+{
+	connect( device, &QIODevice::readyRead, this, &Lexer::readData );
+}
+
+
+void Lexer::readData()
+{
+	m_buffer.append( m_device->readAll() );
+
+	while ( true )
+	{
+		if ( ( m_state == DoingNothing ) && !readCharacter() )
+		{
+			break;
+		}
+
+		switch ( m_state )
+		{
+		case ReadingLength:
+		case ReadingUnsafeString:
+			if ( !readUnsafeString() ) { return; }
+			break;
+		case ReadingSafeString:
+			if ( !readSafeString() ) { return; }
+			break;
+		case DoingNothing:
+			break;
+		}
+
+		if ( m_state != ReadingSafeString )
+		{
+			m_state = DoingNothing;
+		}
+	}
+} // Lexer::readData
+
+
+bool Lexer::readCharacter()
+{
+	if ( m_buffer.isEmpty() )
+	{
+		return( false );
+	}
+
+	char c = m_buffer.at( 0 );
+	m_buffer.remove( 0, 1 );
+
+	switch ( c )
+	{
+	case '+':
+	case '-':
+	case ':':
+	case '*':
+		m_state = ReadingUnsafeString; break;
+	case '$':
+		m_state = ReadingLength;       break;
+	}
+
+	Q_EMIT character( c );
+	return( true );
+} // Lexer::readCharacter
+
+
+bool Lexer::readUnsafeString()
+{
+	m_crlf = m_buffer.indexOf( "\r\n", m_crlf );
+	if ( m_crlf == -1 )
+	{
+		m_crlf = m_buffer.size();
+		return( false );
+	}
+
+	QString s = m_buffer.mid( 0, m_crlf );
+	m_buffer.remove( 0, m_crlf + 2 );
+
+	if ( m_state == ReadingLength )
+	{
+		m_length = s.toInt();
+		m_state  = ReadingSafeString;
+	}
+	else
+	{
+		Q_EMIT unsafeString( s );
+	}
+
+	m_crlf = 0;
+	return( true );
+} // Lexer::readUnsafeString
+
+
+bool Lexer::readSafeString()
+{
+	if ( m_buffer.size() < m_length + 2 )
+	{
+		return( false );
+	}
+
+	QByteArray d = m_buffer.mid( 0, m_length );
+	m_buffer.remove( 0, m_length + 2 );
+
+	Q_EMIT safeString( d );
+
+	m_state = DoingNothing;
+	return( true );
+}