Implemented parser, although it does not support NULL replies nor is it integrated into the Client class.

CMakeLists.txt

@@ -23,6 +23,7 @@ include_directories(include)
 set(QREDIS_SRC
     src/client.cpp
     src/lexer.cpp
+    src/parser.cpp
     src/request.cpp)
 
 # QRedis header files requiring MOC.
@@ -31,6 +32,7 @@ qt5_wrap_cpp(QREDIS_MOC
     include/qredis/request.h
     src/client_p.h
     src/lexer.h
+    src/parser.h
     src/request_p.h)
 
 # Create the client library.

src/lexer.cpp

@@ -25,6 +25,9 @@ void Lexer::readData()
             case ReadingUnsafeString: if(!readUnsafeString()) return; break;
             case ReadingSafeString:   if(!readSafeString())   return; break;
         }
+
+        if(state != ReadingSafeString)
+            state = DoingNothing;
     }
 }
 
@@ -41,12 +44,9 @@ bool Lexer::readCharacter()
     {
         case '+':
         case '-':
-        case '*':
-        case ':': state = ReadingUnsafeString; break;
+        case ':':
+        case '*': state = ReadingUnsafeString; break;
         case '$': state = ReadingLength;       break;
-        default:
-            emit warning(tr("Unexpected character '%1' encountered").arg(static_cast<int>(c), 0, 16));
-            return true;
     }
 
     emit character(c);

src/lexer.h

@@ -19,8 +19,6 @@ class Lexer : public QObject
         void unsafeString(const QString &);
         void safeString(const QByteArray &);
 
-        void warning(const QString &);
-
     private Q_SLOTS:
 
         void readData();

src/parser.cpp

@@ -0,0 +1,85 @@
+#include "parser.h"
+
+Parser::Parser(Lexer * lexer, QObject * parent)
+    : QObject(parent)
+{
+    connect(lexer, SIGNAL(character(char)),        SLOT(readCharacter(char)));
+    connect(lexer, SIGNAL(unsafeString(QString)),  SLOT(readUnsafeString(QString)));
+    connect(lexer, SIGNAL(safeString(QByteArray)), SLOT(readSafeString(QByteArray)));
+}
+
+Parser::~Parser()
+{
+}
+
+void Parser::readCharacter(char c)
+{
+    switch(c)
+    {
+        case '+': stack.append(Task(Task::ReadStatus));    break;
+        case '-': stack.append(Task(Task::ReadError));     break;
+        case ':': stack.append(Task(Task::ReadInteger));   break;
+        case '$': stack.append(Task(Task::ReadBulk));      break;
+        case '*': stack.append(Task(Task::ReadMultiBulk)); break;
+        default:
+            emit warning(tr("Skipping unexpected character '%1'").arg(static_cast<int>(c), 0, 16));
+            break;
+    }
+}
+
+void Parser::readUnsafeString(const QString & value)
+{
+    if(tos().action == Task::ReadMultiBulk)
+        tos().count = value.toInt();
+    else
+    {
+        stack.removeLast();
+
+        if(tos().action == Task::ReadStatus)
+            emit status(value);
+        else if(tos().action == Task::ReadError)
+        {
+            int pos = value.indexOf(' ');
+            emit error(value.left(pos), value.right(pos + 1));
+        }
+        else if(!stack.count())
+            emit integer(value.toLongLong());
+        else
+        {
+            tos().value.toList().append(value);
+            descend();
+        }
+    }
+}
+
+void Parser::readSafeString(const QByteArray & value)
+{
+    stack.removeLast();
+
+    if(!stack.count())
+        emit bulk(value);
+    else
+    {
+        tos().value.toList().append(value);
+        descend();
+    }
+}
+
+void Parser::descend()
+{
+    while(true)
+    {
+        if(tos().value.toList().count() < tos().count)
+            break;
+
+        if(stack.count() == 1)
+        {
+            emit multiBulk(tos().value.toList());
+            stack.removeLast();
+            break;
+        }
+
+        Task task = stack.takeLast();
+        tos().value.toList().append(task.value);
+    }
+}

src/parser.h

@@ -0,0 +1,66 @@
+#ifndef PARSER_H
+#define PARSER_H
+
+#include <QList>
+#include <QObject>
+#include <QVariant>
+#include <QVariantList>
+
+#include "lexer.h"
+
+class Parser : public QObject
+{
+    Q_OBJECT
+
+    public:
+
+        Parser(Lexer *, QObject * = 0);
+        virtual ~Parser();
+
+    Q_SIGNALS:
+
+        void status(const QString &);
+        void error(const QString &, const QString &);
+        void integer(qlonglong);
+        void bulk(const QByteArray &);
+        void multiBulk(const QVariantList &);
+
+        void warning(const QString &);
+
+    private Q_SLOTS:
+
+        void readCharacter(char);
+        void readUnsafeString(const QString &);
+        void readSafeString(const QByteArray &);
+
+    private:
+
+        void descend();
+
+        class Task
+        {
+            public:
+
+                enum Action {
+                    ReadStatus,
+                    ReadError,
+                    ReadInteger,
+                    ReadBulk,
+                    ReadMultiBulk
+                };
+
+                enum { Unknown = -2 };
+
+                Task(Action action) : action(action), count(Unknown) {}
+
+                Action action;
+                int count;
+                QVariant value;
+        };
+
+        QList<Task> stack;
+
+        inline Task & tos() { return stack.last(); }
+};
+
+#endif // PARSER_H