Expressions

- Filter processing short-circuits if there is no filter.
- Variant code was not only incomplete, but very broken.  It should not have
  been used.  It still doesn't handle dates and durations.
- Converted all logical and relational Variant operators to return Boolean
  values.
- Stack size is now checked for every operator.
- All operators implemented (without any advanced special case handling) except
  %, ~ and !~.
- Added lazy DOM expansion at the last possible moment.
- Implemented Expression::create_variant to create appropriate Variant instances
  based on categorized and inferred type.
- Removed Variant math functions.  No point.
- Debug code left in place for now.

src/Expression.cpp

@@ -44,17 +44,20 @@ extern Context context;
 Expression::Expression (Arguments& arguments)
 : _args (arguments)
 {
-  _args.dump ("Expression::Expression");
+  if (_args.size ())
+  {
+    _args.dump ("Expression::Expression");
 
-  expand_sequence ();
-  implicit_and ();
-  expand_tag ();
-  expand_pattern ();
-  expand_attr ();
-  expand_attmod ();
-  expand_word ();
-  expand_tokens ();
-  postfix ();
+    expand_sequence ();
+    implicit_and ();
+    expand_tag ();
+    expand_pattern ();
+    expand_attr ();
+    expand_attmod ();
+    expand_word ();
+    expand_tokens ();
+    postfix ();
+  }
 }
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -71,123 +74,204 @@ bool Expression::eval (Task& task)
 
   // There are elements in the filter, so the expression must be evaluated
   // against each task.
-  std::vector <std::pair <Variant, std::string> > value_stack;
+  std::vector <Variant> value_stack;
 
   // TODO Build an on-demand regex cache.
 
-  std::vector <std::pair <std::string, std::string> >::iterator arg;
+  std::vector <std::pair <std::string, std::string> >::const_iterator arg;
   for (arg = _args.begin (); arg != _args.end (); ++arg)
   {
     if (arg->second == "op")
     {
+      std::cout << "# operator " << arg->first << "\n";
+
       // Handle the unary operator first.
       if (arg->first == "!")
       {
+        // Are there sufficient arguments?
         if (value_stack.size () < 1)
           throw std::string ("Error: Insufficient operands for '!' operator.");
 
-        std::string right_type = value_stack.back ().second;
-        Variant right (value_stack.back ().first);
+        Variant right (value_stack.back ());
+        if (right.raw_type () == "lvalue")
+        {
+          right = Variant (context.dom.get (right.raw (), task));
+          right.raw (value_stack.back ().raw ());
+          right.raw_type (value_stack.back ().raw_type ());
+        }
         value_stack.pop_back ();
 
-        right = ! right;
-        value_stack.push_back (std::make_pair (right, ""));
-        continue;  // This only occurs here.
+        std::cout << "#   " << " ! " << right.dump () << "\n";
+        bool result = !right;
+        right = Variant (result);
+        right.raw_type ("bool");
+
+        std::cout << "#     --> " << right.dump () << "\n";
+        value_stack.push_back (right);
+
+        // This only occurs here, because the unary operators are handled, and
+        // now the binary operators will be processed.
+        continue;
       }
 
+      // Are there sufficient arguments?
       if (value_stack.size () < 2)
         throw std::string ("Error: Insufficient operands for '") + arg->first + "' operator.";
 
-      // Pop the binary operands first.
-      std::string right_type = value_stack.back ().second;
-      Variant right (value_stack.back ().first);
+      // rvalue (string, rx, int, number, dom ...).
+      Variant right (value_stack.back ());
+      if (right.raw_type () == "lvalue")
+      {
+        right = Variant (context.dom.get (right.raw (), task));
+        right.raw (value_stack.back ().raw ());
+        right.raw_type (value_stack.back ().raw_type ());
+      }
       value_stack.pop_back ();
 
-      std::string left_type = value_stack.back ().second;
-      Variant left (value_stack.back ().first);
+      // lvalue (dom).
+      Variant left (value_stack.back ());
+      if (left.raw_type () == "lvalue")
+      {
+        left = Variant (context.dom.get (left.raw (), task));
+        left.raw (value_stack.back ().raw ());
+        left.raw_type (value_stack.back ().raw_type ());
+      }
       value_stack.pop_back ();
 
-      // Now hte binary operators.
+      // Now the binary operators.
       if (arg->first == "and")
       {
-        left = left && right;
-        value_stack.push_back (std::make_pair (left, ""));
+        std::cout << "#   " << left.dump () << " and " << right.dump () << "\n";
+        bool result = (left && right);
+        left = Variant (result);
+        left.raw_type ("bool");
+
+        std::cout << "#     --> " << left.dump () << "\n";
+        value_stack.push_back (left);
       }
 
       else if (arg->first == "xor")
       {
-        left = (left && !right) || (!left && right);
-        value_stack.push_back (std::make_pair (left, ""));
+        std::cout << "#   " << left.dump () << " xor " << right.dump () << "\n";
+        bool left_bool  = left.boolean ();
+        bool right_bool = right.boolean ();
+        bool result = (left_bool && !right_bool) || (!left_bool && right_bool);
+        left = Variant (result);
+        left.raw_type ("bool");
+
+        std::cout << "#     --> " << left.dump () << "\n";
+        value_stack.push_back (left);
       }
 
       else if (arg->first == "or")
       {
-        left = left || right;
-        value_stack.push_back (std::make_pair (left, ""));
+        std::cout << "#   " << left.dump () << " or " << right.dump () << "\n";
+        bool result = (left || right);
+        left = Variant (result);
+        left.raw_type ("bool");
+
+        std::cout << "#     --> " << left.dump () << "\n";
+        value_stack.push_back (left);
       }
 
       else if (arg->first == "<=")
       {
-        left = left <= right;
-        value_stack.push_back (std::make_pair (left, ""));
+        std::cout << "#   " << left.dump () << " <= " << right.dump () << "\n";
+        bool result = (left <= right);
+        left = Variant (result);
+        left.raw_type ("bool");
+
+        std::cout << "#     --> " << left.dump () << "\n";
+        value_stack.push_back (left);
       }
 
       else if (arg->first == ">=")
       {
-        left = left >= right;
-        value_stack.push_back (std::make_pair (left, ""));
+        std::cout << "#   " << left.dump () << " >= " << right.dump () << "\n";
+        bool result = (left >= right);
+        left = Variant (result);
+        left.raw_type ("bool");
+
+        std::cout << "#     --> " << left.dump () << "\n";
+        value_stack.push_back (left);
       }
 
       else if (arg->first == "!~")
       {
-        // TODO
-/*
-  if left == "description" then it really means description or annotations or project.
-  if left == "tags" then it just means tags.
-*/
+        // TODO Copy "~".
       }
 
       else if (arg->first == "!=")
       {
-        left = left != right;
-        value_stack.push_back (std::make_pair (left, ""));
+        std::cout << "#   " << left.dump () << " != " << right.dump () << "\n";
+        bool result = (left != right);
+        left = Variant (result);
+        left.raw_type ("bool");
+
+        std::cout << "#     --> " << left.dump () << "\n";
+        value_stack.push_back (left);
       }
 
       else if (arg->first == "=")
       {
-context.debug ("eval left=" + left.format ());
-context.debug ("eval right=" + right.format ());
+        std::cout << "#   " << left.dump () << " = " << right.dump () << "\n";
+        bool result = (left == right);
+        left = Variant (result);
+        left.raw_type ("bool");
 
-        left = left == right;
-        value_stack.push_back (std::make_pair (left, ""));
+        std::cout << "#     --> " << left.dump () << "\n";
+        value_stack.push_back (left);
       }
 
       else if (arg->first == ">")
       {
-        left = left > right;
-        value_stack.push_back (std::make_pair (left, ""));
+        std::cout << "#   " << left.dump () << " > " << right.dump () << "\n";
+        bool result = (left > right);
+        left = Variant (result);
+        left.raw_type ("bool");
+
+        std::cout << "#     --> " << left.dump () << "\n";
+        value_stack.push_back (left);
       }
 
       else if (arg->first == "~")
       {
-        // TODO We need to compare right against description, all annotations and project.
-        // TODO Does that mean we need the original lvalue intact, and not a DOM subst?
-/*
-  if left == "description" then it really means description or annotations or project.
-  if left == "tags" then it just means tags.
-*/
+        // Matches against description are really against either description,
+        // annotations or project.
+        if (left.raw () == "description")
+        {
+          if (right.raw_type () == "rx")
+          {
+            throw std::string ("rx not supported");
+          }
+          else
+          {
+          }
+        }
+
+        // Matches against non-description fields are treated as-is.
+        else
+        {
+          if (right.raw_type () == "rx")
+          {
+            throw std::string ("rx not supported");
+          }
+          else
+          {
+          }
+        }
       }
 
       else if (arg->first == "*")
       {
         left = left * right;
-        value_stack.push_back (std::make_pair (left, ""));
+        value_stack.push_back (left);
       }
 
       else if (arg->first == "/")
       {
         left = left / right;
-        value_stack.push_back (std::make_pair (left, ""));
+        value_stack.push_back (left);
       }
 
       else if (arg->first == "%")
@@ -198,19 +282,24 @@ context.debug ("eval right=" + right.format ());
       else if (arg->first == "+")
       {
         left = left + right;
-        value_stack.push_back (std::make_pair (left, ""));
+        value_stack.push_back (left);
       }
 
       else if (arg->first == "-")
       {
         left = left - right;
-        value_stack.push_back (std::make_pair (left, ""));
+        value_stack.push_back (left);
       }
 
       else if (arg->first == "<")
       {
-        left = left < right;
-        value_stack.push_back (std::make_pair (left, ""));
+        std::cout << "#   " << left.dump () << " < " << right.dump () << "\n";
+        bool result = (left < right);
+        left = Variant (result);
+        left.raw_type ("bool");
+
+        std::cout << "#     --> " << left.dump () << "\n";
+        value_stack.push_back (left);
       }
 
       else
@@ -220,28 +309,14 @@ context.debug ("eval right=" + right.format ());
     // It's not an operator, it's either and lvalue or some form of rvalue.
     else
     {
-      if (arg->second == "lvalue")
-        value_stack.push_back (std::make_pair (Variant (context.dom.get (arg->first, task)), ""));
-
-      else if (arg->second == "int")
-        value_stack.push_back (std::make_pair (Variant ((int) strtol (arg->first.c_str (), NULL, 10)), ""));
-
-      else if (arg->second == "number")
-        value_stack.push_back (std::make_pair (Variant (strtod (arg->first.c_str (), NULL)), ""));
-
-      else if (arg->second == "rvalue" ||
-               arg->second == "string" ||
-               arg->second == "rx")
-        value_stack.push_back (std::make_pair (Variant (unquoteText (arg->first)), ""));
-
-      else
-        throw std::string ("Error: Expression::eval unrecognized operand '") +   + "'.";
+      Variant operand;
+      create_variant (operand, arg->first, arg->second);
+      value_stack.push_back (operand);
     }
   }
 
   // Coerce stack element to boolean.
-  Variant result (value_stack.back ().first);
-  //context.debug ("eval result=" + result.format ());
+  Variant result (value_stack.back ());
   value_stack.pop_back ();
   bool pass_fail = result.boolean ();
 
@@ -252,6 +327,38 @@ context.debug ("eval right=" + right.format ());
   return pass_fail;
 }
 
+////////////////////////////////////////////////////////////////////////////////
+void Expression::create_variant (
+  Variant& variant,
+  const std::string& value,
+  const std::string& type)
+{
+  std::cout << "# operand '" << value << "' as " << type << "\n";
+
+  // DOM references are not resolved until the operator is processed.  This
+  // preserves the original name, which helps determine how to apply the
+  // operator.
+  if (type == "lvalue")
+    variant = Variant (value);
+
+  else if (type == "int")
+    variant = Variant ((int) strtol (value.c_str (), NULL, 10));
+
+  else if (type == "number")
+    variant = Variant (strtod (value.c_str (), NULL));
+
+  else if (type == "rvalue" ||
+           type == "string" ||
+           type == "rx")
+    variant = Variant (unquoteText (value));
+
+  else
+    throw std::string ("Unrecognized operand '") +   + "'.";
+
+  variant.raw (value);
+  variant.raw_type (type);
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // Convert:  1,3-5,00000000-0000-0000-0000-000000000000
 //

src/Expression.h

@@ -32,6 +32,7 @@
 #include <stack>
 #include <Arguments.h>
 #include <Task.h>
+#include <Variant.h>
 
 class Expression
 {
@@ -51,6 +52,7 @@ private:
   void expand_tokens ();
   void postfix ();
 
+  void create_variant (Variant&, const std::string&, const std::string&);
   bool is_new_style ();
 
 private:

src/Variant.cpp

@@ -32,15 +32,19 @@
 #include <Variant.h>
 
 ////////////////////////////////////////////////////////////////////////////////
-Variant::Variant () :
-  mType (v_unknown)
+Variant::Variant ()
+: mType (v_unknown)
+, mRaw ("")
+, mRawType ("")
 {
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 Variant::Variant (const Variant& other)
 {
-  mType = other.mType;
+  mType    = other.mType;
+  mRaw     = other.mRaw;
+  mRawType = other.mRawType;
 
   // Explicitly copy only the relevant type.  This saves memory.
   switch (mType)
@@ -98,188 +102,217 @@ Variant::Variant (const Duration& input)
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-Variant& Variant::operator&& (const Variant& other)
+// For copying.
+Variant& Variant::operator= (const Variant& other)
+{
+  if (this != &other)
+  {
+    mType     = other.mType;
+    mBool     = other.mBool;
+    mInteger  = other.mInteger;
+    mDouble   = other.mDouble;
+    mString   = other.mString;
+    mDate     = other.mDate;
+    mDuration = other.mDuration;
+    mRaw      = other.mRaw;
+    mRawType  = other.mRawType;
+  }
+
+  return *this;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+bool Variant::operator&& (Variant& other)
 {
   cast (v_boolean);
-  Variant copy (other);
-  copy.cast (v_boolean);
-  mBool = (mBool && copy.mBool) ? true : false;
-  return *this;
+  other.cast (v_boolean);
+  return mBool && other.mBool;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-Variant& Variant::operator|| (const Variant& other)
+bool Variant::operator|| (Variant& other)
 {
   cast (v_boolean);
-  Variant copy (other);
-  copy.cast (v_boolean);
-  mBool = (mBool || copy.mBool) ? true : false;
-  return *this;
+  other.cast (v_boolean);
+  return mBool || other.mBool;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-Variant& Variant::operator<= (const Variant& other)
+bool Variant::operator<= (Variant& other)
 {
+  promote (*this, other);
+  bool result;
+
   switch (mType)
   {
   case v_boolean:
-    mBool = false;  // TODO Makes no sense.
+    throw std::string ("Cannot perform relative comparison on bool types");
     break;
 
   case v_integer:
-    mBool = mInteger <= other.mInteger ? true : false;
+    result = mInteger <= other.mInteger ? true : false;
     break;
 
   case v_double:
-    mBool = mDouble <= other.mDouble ? true : false;
+    result = mDouble <= other.mDouble ? true : false;
     break;
 
   case v_string:
     {
       int collating = strcmp (mString.c_str (), other.mString.c_str ());
-      mBool = collating <= 0 ? true : false;
+      result = collating <= 0 ? true : false;
     }
     break;
 
   case v_date:
-    mBool = mDate <= other.mDate ? true : false;
+    result = mDate <= other.mDate ? true : false;
     break;
 
   case v_duration:
-    mBool = (time_t)mDuration <= (time_t)other.mDuration ? true : false;
+    result = (time_t)mDuration <= (time_t)other.mDuration ? true : false;
     break;
 
   case v_unknown:
+    throw std::string ("Cannot perform relative comparison on unknown types");
     break;
   }
 
-  mType = v_boolean;
-  return *this;
+  return result;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-Variant& Variant::operator>= (const Variant& other)
+bool Variant::operator>= (Variant& other)
 {
+  promote (*this, other);
+  bool result;
+
   switch (mType)
   {
   case v_boolean:
-    mBool = false;  // TODO Makes no sense.
+    throw std::string ("Cannot perform relative comparison on bool types");
     break;
 
   case v_integer:
-    mBool = mInteger >= other.mInteger ? true : false;
+    result = mInteger >= other.mInteger ? true : false;
     break;
 
   case v_double:
-    mBool = mDouble >= other.mDouble ? true : false;
+    result = mDouble >= other.mDouble ? true : false;
     break;
 
   case v_string:
     {
       int collating = strcmp (mString.c_str (), other.mString.c_str ());
-      mBool = collating >= 0 ? true : false;
+      result = collating >= 0 ? true : false;
     }
     break;
 
   case v_date:
-    mBool = mDate >= other.mDate ? true : false;
+    result = mDate >= other.mDate ? true : false;
     break;
 
   case v_duration:
-    mBool = (time_t)mDuration >= (time_t)other.mDuration ? true : false;
+    result = (time_t)mDuration >= (time_t)other.mDuration ? true : false;
     break;
 
   case v_unknown:
+    throw std::string ("Cannot perform relative comparison on unknown types");
     break;
   }
 
-  mType = v_boolean;
-  return *this;
+  return result;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-Variant& Variant::operator== (const Variant& other)
+bool Variant::operator== (Variant& other)
 {
+  promote (*this, other);
+  bool result;
+
   switch (mType)
   {
   case v_boolean:
-    mBool = mBool == other.mBool ? true : false;
+    result = mBool == other.mBool ? true : false;
     break;
 
   case v_integer:
-    mBool = mInteger == other.mInteger ? true : false;
+    result = mInteger == other.mInteger ? true : false;
     break;
 
   case v_double:
-    mBool = mDouble == other.mDouble ? true : false;
+    result = mDouble == other.mDouble ? true : false;
     break;
 
   case v_string:
     {
       int collating = strcmp (mString.c_str (), other.mString.c_str ());
-      mBool = collating == 0 ? true : false;
+      result = collating == 0 ? true : false;
     }
     break;
 
   case v_date:
-    mBool = mDate == other.mDate ? true : false;
+    result = mDate == other.mDate ? true : false;
     break;
 
   case v_duration:
-    mBool = mDuration == other.mDuration ? true : false;
+    result = mDuration == other.mDuration ? true : false;
     break;
 
   case v_unknown:
+    throw std::string ("Cannot perform relative comparison on unknown types");
     break;
   }
 
-  mType = v_boolean;
-  return *this;
+  return result;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-Variant& Variant::operator!= (const Variant& other)
+bool Variant::operator!= (Variant& other)
 {
+  promote (*this, other);
+  bool result;
+
   switch (mType)
   {
   case v_boolean:
-    mBool = mBool != other.mBool ? true : false;
+    result = mBool != other.mBool ? true : false;
     break;
 
   case v_integer:
-    mBool = mInteger != other.mInteger ? true : false;
+    result = mInteger != other.mInteger ? true : false;
     break;
 
   case v_double:
-    mBool = mDouble != other.mDouble ? true : false;
+    result = mDouble != other.mDouble ? true : false;
     break;
 
   case v_string:
     {
       int collating = strcmp (mString.c_str (), other.mString.c_str ());
-      mBool = collating != 0 ? true : false;
+      result = collating != 0 ? true : false;
     }
     break;
 
   case v_date:
-    mBool = mDate != other.mDate ? true : false;
+    result = mDate != other.mDate ? true : false;
     break;
 
   case v_duration:
-    mBool = mDuration != other.mDuration ? true : false;
+    result = mDuration != other.mDuration ? true : false;
     break;
 
   case v_unknown:
+    throw std::string ("Cannot perform relative comparison on unknown types");
     break;
   }
 
-  mType = v_boolean;
-  return *this;
+  return result;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-Variant& Variant::operator^ (const Variant& other)
+Variant& Variant::operator^ (Variant& other)
 {
+  // TODO This is all wrong!
   switch (mType)
   {
   case v_boolean:
@@ -307,6 +340,7 @@ Variant& Variant::operator^ (const Variant& other)
     break;
 
   case v_unknown:
+    throw std::string ("Cannot perform exponentiation on unknown types");
     break;
   }
 
@@ -314,16 +348,18 @@ Variant& Variant::operator^ (const Variant& other)
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-Variant& Variant::operator! ()
+bool Variant::operator! ()
 {
   cast (v_boolean);
   mBool = ! mBool;
-  return *this;
+  return mBool;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-Variant& Variant::operator- (const Variant& other)
+Variant& Variant::operator- (Variant& other)
 {
+  promote (*this, other);
+
   switch (mType)
   {
   case v_boolean:
@@ -352,6 +388,7 @@ Variant& Variant::operator- (const Variant& other)
     break;
 
   case v_unknown:
+    throw std::string ("Cannot perform subtraction on unknown types");
     break;
   }
 
@@ -359,8 +396,10 @@ Variant& Variant::operator- (const Variant& other)
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-Variant& Variant::operator+ (const Variant& other)
+Variant& Variant::operator+ (Variant& other)
 {
+  promote (*this, other);
+
   switch (mType)
   {
   case v_boolean:
@@ -390,6 +429,7 @@ Variant& Variant::operator+ (const Variant& other)
     break;
 
   case v_unknown:
+    throw std::string ("Cannot perform addition on unknown types");
     break;
   }
 
@@ -397,8 +437,10 @@ Variant& Variant::operator+ (const Variant& other)
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-Variant& Variant::operator* (const Variant& other)
+Variant& Variant::operator* (Variant& other)
 {
+  promote (*this, other);
+
   switch (mType)
   {
   case v_boolean:
@@ -426,6 +468,7 @@ Variant& Variant::operator* (const Variant& other)
     break;
 
   case v_unknown:
+    throw std::string ("Cannot perform multiplication on unknown types");
     break;
   }
 
@@ -433,8 +476,10 @@ Variant& Variant::operator* (const Variant& other)
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-Variant& Variant::operator/ (const Variant& other)
+Variant& Variant::operator/ (Variant& other)
 {
+  promote (*this, other);
+
   switch (mType)
   {
   case v_boolean:
@@ -462,6 +507,7 @@ Variant& Variant::operator/ (const Variant& other)
     break;
 
   case v_unknown:
+    throw std::string ("Cannot perform division on unknown types");
     break;
   }
 
@@ -469,8 +515,11 @@ Variant& Variant::operator/ (const Variant& other)
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-Variant& Variant::operator< (const Variant& other)
+bool Variant::operator< (Variant& other)
 {
+  promote (*this, other);
+  bool result;
+
   switch (mType)
   {
   case v_boolean:
@@ -478,39 +527,42 @@ Variant& Variant::operator< (const Variant& other)
     break;
 
   case v_integer:
-    mBool = mInteger < other.mInteger ? true : false;
+    result = mInteger < other.mInteger ? true : false;
     break;
 
   case v_double:
-    mBool = mDouble < other.mDouble ? true : false;
+    result = mDouble < other.mDouble ? true : false;
     break;
 
   case v_string:
     {
       int collating = strcmp (mString.c_str (), other.mString.c_str ());
-      mBool = collating < 0 ? true : false;
+      result = collating < 0 ? true : false;
     }
     break;
 
   case v_date:
-    mBool = mDate < other.mDate ? true : false;
+    result = mDate < other.mDate ? true : false;
     break;
 
   case v_duration:
-    mBool = mDuration < other.mDuration ? true : false;
+    result = mDuration < other.mDuration ? true : false;
     break;
 
   case v_unknown:
+    throw std::string ("Cannot perform relative comparisons on unknown types");
     break;
   }
 
-  mType = v_boolean;
-  return *this;
+  return result;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-Variant& Variant::operator> (const Variant& other)
+bool Variant::operator> (Variant& other)
 {
+  promote (*this, other);
+  bool result;
+
   switch (mType)
   {
   case v_boolean:
@@ -518,129 +570,34 @@ Variant& Variant::operator> (const Variant& other)
     break;
 
   case v_integer:
-    mBool = mInteger > other.mInteger ? true : false;
+    result = mInteger > other.mInteger ? true : false;
     break;
 
   case v_double:
-    mBool = mDouble > other.mDouble ? true : false;
+    result = mDouble > other.mDouble ? true : false;
     break;
 
   case v_string:
     {
       int collating = strcmp (mString.c_str (), other.mString.c_str ());
-      mBool = collating > 0 ? true : false;
+      result = collating > 0 ? true : false;
     }
     break;
 
   case v_date:
-    mBool = mDate > other.mDate ? true : false;
+    result = mDate > other.mDate ? true : false;
     break;
 
   case v_duration:
-    mBool = mDuration > other.mDuration ? true : false;
+    result = mDuration > other.mDuration ? true : false;
     break;
 
   case v_unknown:
+    throw std::string ("Cannot perform relative comparisons on unknown types");
     break;
   }
 
-  mType = v_boolean;
-  return *this;
-}
-
-////////////////////////////////////////////////////////////////////////////////
-void Variant::sqrt ()
-{
-  cast (v_double);
-  if (mDouble < 0.0)
-    throw std::string ("Cannot take the square root of a negative number.");
-  mDouble = ::sqrt (mDouble);
-}
-
-////////////////////////////////////////////////////////////////////////////////
-void Variant::sin ()
-{
-  cast (v_double);
-  mDouble = ::sin (mDouble);
-}
-
-////////////////////////////////////////////////////////////////////////////////
-void Variant::cos ()
-{
-  cast (v_double);
-  mDouble = ::cos (mDouble);
-}
-
-////////////////////////////////////////////////////////////////////////////////
-void Variant::tan ()
-{
-  cast (v_double);
-  mDouble = ::tan (mDouble);
-}
-
-////////////////////////////////////////////////////////////////////////////////
-void Variant::asin ()
-{
-  cast (v_double);
-  mDouble = ::asin (mDouble);
-}
-
-////////////////////////////////////////////////////////////////////////////////
-void Variant::acos ()
-{
-  cast (v_double);
-  mDouble = ::acos (mDouble);
-}
-
-////////////////////////////////////////////////////////////////////////////////
-void Variant::atan ()
-{
-  cast (v_double);
-  mDouble = ::atan (mDouble);
-}
-
-////////////////////////////////////////////////////////////////////////////////
-void Variant::log ()
-{
-  cast (v_double);
-  mDouble = ::log10 (mDouble);
-}
-
-////////////////////////////////////////////////////////////////////////////////
-void Variant::exp ()
-{
-  cast (v_double);
-  mDouble = ::exp (mDouble);
-}
-
-////////////////////////////////////////////////////////////////////////////////
-void Variant::exp10 ()
-{
-  cast (v_double);
-  mDouble = ::pow (10.0, mDouble);
-}
-
-////////////////////////////////////////////////////////////////////////////////
-void Variant::ln ()
-{
-  cast (v_double);
-  mDouble = ::sqrt (mDouble);
-}
-
-////////////////////////////////////////////////////////////////////////////////
-void Variant::sign ()
-{
-  cast (v_double);
-  if (mDouble == 0.0)
-    throw std::string ("Divide by zero.");
-  mDouble /= fabs (mDouble);
-}
-
-////////////////////////////////////////////////////////////////////////////////
-void Variant::abs ()
-{
-  cast (v_double);
-  mDouble = ::fabs (mDouble);
+  return result;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -820,6 +777,30 @@ Variant::variant_type Variant::type ()
   return mType;
 }
 
+////////////////////////////////////////////////////////////////////////////////
+void Variant::raw (const std::string& input)
+{
+  mRaw = input;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+std::string Variant::raw ()
+{
+  return mRaw;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+void Variant::raw_type (const std::string& input)
+{
+  mRawType = input;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+std::string Variant::raw_type ()
+{
+  return mRawType;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 void Variant::promote (Variant& lhs, Variant& rhs)
 {
@@ -861,3 +842,9 @@ bool Variant::boolean ()
 }
 
 ////////////////////////////////////////////////////////////////////////////////
+std::string Variant::dump ()
+{
+  return format () + "/" + raw () + "/" + raw_type ();
+}
+
+////////////////////////////////////////////////////////////////////////////////

src/Variant.h

@@ -55,42 +55,36 @@ public:
   Variant (const std::string&);
   Variant (const Date&);
   Variant (const Duration&);
+  Variant& operator= (const Variant&);
 
-  Variant& operator&& (const Variant& other);
-  Variant& operator|| (const Variant& other);
-  Variant& operator<= (const Variant& other);
-  Variant& operator>= (const Variant& other);
-  Variant& operator== (const Variant& other);
-  Variant& operator!= (const Variant& other);
-  Variant& operator^ (const Variant& other);
-  Variant& operator! ();
-  Variant& operator- (const Variant& other);
-  Variant& operator+ (const Variant& other);
-  Variant& operator* (const Variant& other);
-  Variant& operator/ (const Variant& other);
-  Variant& operator< (const Variant& other);
-  Variant& operator> (const Variant& other);
+  bool operator&& (Variant& other);
+  bool operator|| (Variant& other);
 
-  void sqrt  ();
-  void sin   ();
-  void cos   ();
-  void tan   ();
-  void asin  ();
-  void acos  ();
-  void atan  ();
-  void log   ();
-  void exp   ();
-  void exp10 ();
-  void ln    ();
-  void sign  ();
-  void abs   ();
+  bool operator<= (Variant& other);
+  bool operator>= (Variant& other);
+  bool operator== (Variant& other);
+  bool operator< (Variant& other);
+  bool operator> (Variant& other);
+  bool operator!= (Variant& other);
+  bool operator! ();
+
+  Variant& operator^ (Variant& other);
+  Variant& operator- (Variant& other);
+  Variant& operator+ (Variant& other);
+  Variant& operator* (Variant& other);
+  Variant& operator/ (Variant& other);
 
   void input (const std::string&);
   std::string format ();
   void cast (const variant_type);
   variant_type type ();
+  void raw (const std::string&);
+  std::string raw ();
+  void raw_type (const std::string&);
+  std::string raw_type ();
   void promote (Variant&, Variant&);
   bool boolean ();
+  std::string dump ();
 
 private:
   variant_type mType;
@@ -101,6 +95,9 @@ private:
   std::string mString;
   Date mDate;
   Duration mDuration;
+
+  std::string mRaw;
+  std::string mRawType;
 };
 
 #endif