JSON lib support for double values

lib/json.cpp

@@ -451,9 +451,27 @@ JSON::Value::Value(std::istream & fromstream) {
       case '8':
       case '9':
         c = fromstream.get();
+        if (myType != INTEGER && myType != DOUBLE){
           myType = INTEGER;
+        }
+        if (myType == INTEGER){
           intVal *= 10;
           intVal += c - '0';
+        }else{
+          dblDivider *= 10;
+          dblVal += ((double)((c - '0')) / dblDivider);
+        }
+        break;
+      case '.':
+        c = fromstream.get();
+        myType = DOUBLE;
+        if (negative){
+          dblVal = -intVal;
+          dblDivider = -1;
+        }else{
+          dblVal = intVal;
+          dblDivider = 1;
+        }
         break;
       case ',':
         if (!reading_object && !reading_array) {
@@ -528,6 +546,12 @@ JSON::Value::Value(long long int val) {
   intVal = val;
 }
 
+/// Sets this JSON::Value to the given double.
+JSON::Value::Value(double val) {
+  myType = DOUBLE;
+  dblVal = val;
+}
+
 /// Sets this JSON::Value to the given integer.
 JSON::Value::Value(bool val) {
   myType = BOOL;
@@ -546,6 +570,9 @@ bool JSON::Value::operator==(const JSON::Value & rhs) const {
   if (myType == INTEGER || myType == BOOL) {
     return intVal == rhs.intVal;
   }
+  if (myType == DOUBLE) {
+    return dblVal == rhs.dblVal;
+  }
   if (myType == STRING) {
     return strVal == rhs.strVal;
   }
@@ -619,6 +646,8 @@ void JSON::Value::null() {
   shrink(0);
   strVal.clear();
   intVal = 0;
+  dblVal = 0;
+  dblDivider = 1;
   myType = EMPTY;
 }
 
@@ -632,6 +661,9 @@ JSON::Value & JSON::Value::assignFrom(const Value & rhs, const std::set<std::str
   if (myType == BOOL || myType == INTEGER){
     intVal = rhs.intVal;
   }
+  if (myType == DOUBLE){
+    dblVal = rhs.dblVal;
+  }
   if (myType == OBJECT){
     jsonForEachConst(rhs, i){
       if (!skip.count(i.key())){
@@ -661,6 +693,9 @@ JSON::Value & JSON::Value::operator=(const JSON::Value & rhs) {
   if (myType == BOOL || myType == INTEGER){
     intVal = rhs.intVal;
   }
+  if (myType == DOUBLE){
+    dblVal = rhs.dblVal;
+  }
   if (myType == OBJECT){
     jsonForEachConst(rhs, i){
       (*this)[i.key()] = *i;
@@ -708,6 +743,14 @@ JSON::Value & JSON::Value::operator=(const int & rhs) {
   return ((*this) = (long long int)rhs);
 }
 
+/// Sets this JSON::Value to the given double.
+JSON::Value & JSON::Value::operator=(const double & rhs) {
+  null();
+  myType = DOUBLE;
+  dblVal = rhs;
+  return *this;
+}
+
 /// Sets this JSON::Value to the given integer.
 JSON::Value & JSON::Value::operator=(const unsigned int & rhs) {
   return ((*this) = (long long int)rhs);
@@ -718,12 +761,29 @@ JSON::Value::operator long long int() const {
   if (myType == INTEGER) {
     return intVal;
   }
+  if (myType == DOUBLE) {
+    return (long long int)dblVal;
+  }
   if (myType == STRING) {
     return atoll(strVal.c_str());
   }
   return 0;
 }
 
+/// Automatic conversion to double - returns 0 if not convertable.
+JSON::Value::operator double() const {
+  if (myType == INTEGER) {
+    return (double)intVal;
+  }
+  if (myType == DOUBLE) {
+    return dblVal;
+  }
+  if (myType == STRING) {
+    return atof(strVal.c_str());
+  }
+  return 0;
+}
+
 /// Automatic conversion to std::string.
 /// Returns the raw string value if available, otherwise calls toString().
 JSON::Value::operator std::string() const {
@@ -747,6 +807,9 @@ JSON::Value::operator bool() const {
   if (myType == INTEGER) {
     return intVal != 0;
   }
+  if (myType == DOUBLE) {
+    return dblVal != 0;
+  }
   if (myType == BOOL) {
     return intVal != 0;
   }
@@ -770,6 +833,10 @@ const std::string JSON::Value::asString() const {
 const long long int JSON::Value::asInt() const {
   return (long long int) * this;
 }
+/// Explicit conversion to double.
+const double JSON::Value::asDouble() const {
+  return (double) * this;
+}
 /// Explicit conversion to bool.
 const bool JSON::Value::asBool() const {
   return (bool) * this;
@@ -1127,6 +1194,12 @@ std::string JSON::Value::toString() const {
         return st.str();
         break;
       }
+    case DOUBLE: {
+        std::stringstream st;
+        st << dblVal;
+        return st.str();
+        break;
+      }
     case BOOL: {
         if (intVal != 0){
           return "true";
@@ -1185,6 +1258,12 @@ std::string JSON::Value::toPrettyString(int indentation) const {
         return st.str();
         break;
       }
+    case DOUBLE: {
+        std::stringstream st;
+        st << dblVal;
+        return st.str();
+        break;
+      }
     case STRING: {
         for (unsigned int i = 0; i < 201 && i < strVal.size(); ++i) {
           if (strVal[i] < 32 || strVal[i] > 126 || strVal.size() > 200) {
@@ -1319,6 +1398,11 @@ bool JSON::Value::isInt() const {
   return (myType == INTEGER);
 }
 
+/// Returns true if this object is a double.
+bool JSON::Value::isDouble() const {
+  return (myType == DOUBLE);
+}
+
 /// Returns true if this object is a string.
 bool JSON::Value::isString() const {
   return (myType == STRING);

lib/json.h

@@ -14,7 +14,7 @@ namespace JSON {
 
   /// Lists all types of JSON::Value.
   enum ValueType {
-    EMPTY, BOOL, INTEGER, STRING, ARRAY, OBJECT
+    EMPTY, BOOL, INTEGER, DOUBLE, STRING, ARRAY, OBJECT
   };
 
   /// JSON-string-escapes a value
@@ -28,6 +28,8 @@ namespace JSON {
       ValueType myType;
       long long int intVal;
       std::string strVal;
+      double dblVal;
+      double dblDivider;
       std::deque<Value*> arrVal;
       std::map<std::string, Value*> objVal;
     public:
@@ -39,6 +41,7 @@ namespace JSON {
       Value(const std::string & val);
       Value(const char * val);
       Value(long long int val);
+      Value(double val);
       Value(bool val);
       //comparison operators
       bool operator==(const Value & rhs) const;
@@ -52,14 +55,17 @@ namespace JSON {
       Value & operator=(const char * rhs);
       Value & operator=(const long long int & rhs);
       Value & operator=(const int & rhs);
+      Value & operator=(const double & rhs);
       Value & operator=(const unsigned int & rhs);
       Value & operator=(const bool & rhs);
       //converts to basic types
       operator long long int() const;
       operator std::string() const;
       operator bool() const;
+      operator double() const;
       const std::string asString() const;
       const long long int asInt() const;
+      const double asDouble() const;
       const bool asBool() const;
       const std::string & asStringRef() const;
       const char * c_str() const;
@@ -87,6 +93,7 @@ namespace JSON {
       void removeNullMembers();
       bool isMember(const std::string & name) const;
       bool isInt() const;
+      bool isDouble() const;
       bool isString() const;
       bool isBool() const;
       bool isObject() const;