Enhancement - Subst parsing

- Corrected Subst parsing.
- Added more unit tests.

src/Context.cpp

@@ -245,14 +245,6 @@ void Context::parse ()
     {
       if (!terminated)
       {
-/*
-        size_t colon;               // Pointer to colon in argument.
-        std::string from;
-        std::string to;
-        bool global;
-        std::vector <int> sequence;
-*/
-
         // The '--' argument shuts off all parsing - everything is an argument.
         if (*arg == "--")
           terminated = true;

src/Subst.cpp

@@ -69,7 +69,25 @@ Subst::~Subst ()
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-bool Subst::parse (const std::string& input)
+bool Subst::valid (const std::string& input) const
+{
+  std::string ignored;
+  Nibbler n (input);
+  if (n.skip     ('/')            &&
+      n.getUntil ('/', ignored)   &&
+      n.skip     ('/')            &&
+      n.getUntil ('/', ignored)   &&
+      n.skip     ('/'))
+  {
+    n.skip ('g');
+    return true;
+  }
+
+  return false;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+void Subst::parse (const std::string& input)
 {
   Nibbler n (input);
   if (n.skip     ('/')        &&
@@ -79,18 +97,21 @@ bool Subst::parse (const std::string& input)
       n.skip     ('/'))
   {
       mGlobal = n.skip ('g');
-    return true;
-  }
 
-  return false;
+    if (mFrom == "")
+      throw std::string ("Cannot substitute an empty string");
+
+    if (!n.depleted ())
+      throw std::string ("Unrecognized character(s) at end of substitution");
+  }
+  else
+    throw std::string ("Malformed substitution");
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 void Subst::apply (
   std::string& description,
   std::vector <Att>& annotations) const
-{
-  if (mFrom != "")
 {
   std::string::size_type pattern;
 
@@ -134,6 +155,5 @@ void Subst::apply (
     }
   }
 }
-}
 
 ////////////////////////////////////////////////////////////////////////////////

src/Subst.h

@@ -39,7 +39,8 @@ public:
   Subst& operator= (const Subst&); // Assignment operator
   ~Subst ();                       // Destructor
 
-  bool parse (const std::string&);
+  bool valid (const std::string&) const;
+  void parse (const std::string&);
   void apply (std::string&, std::vector <Att>&) const;
 
 public:

src/tests/subst.t.cpp

@@ -34,13 +34,32 @@ Context context;
 ////////////////////////////////////////////////////////////////////////////////
 int main (int argc, char** argv)
 {
-  UnitTest t (3);
+  UnitTest t (15);
 
   T2 task;
   task.set ("description", "one two three four");
 
   Subst s;
-  if (s.parse ("/two/TWO/"))
+  t.ok (s.valid ("/a/b/x"),         "valid /a/b/x");
+  t.ok (s.valid ("/a/b/"),          "valid /a/b/");
+  t.ok (s.valid ("/two/TWO/"),      "valid /two/TWO/");
+  t.ok (s.valid ("/e /E /g"),       "valid /e /E /g");
+  t.ok (s.valid ("/from/to/g"),     "valid /from/to/g");
+  t.ok (s.valid ("/long string//"), "valid /long string//");
+  t.ok (s.valid ("//fail/"),        "valid //fail/");
+
+  bool good = true;
+  try { s.parse ("/a/b/x"); } catch (...) { good = false; }
+  t.notok (good, "failed /a/b/x");
+
+  good = true;
+  try { s.parse ("//to/"); } catch (...) { good = false; }
+  t.notok (good, "failed //to/");
+
+  good = true;
+  try { s.parse ("/two/TWO/"); } catch (...) { good = false; }
+  t.ok (good, "parsed /two/TWO/");
+  if (good)
   {
     std::string description = task.get ("description");
     std::vector <Att> annotations;
@@ -54,7 +73,10 @@ int main (int argc, char** argv)
     t.fail ("failed to parse '/two/TWO/'");
   }
 
-  if (s.parse ("/e /E /g"))
+  good = true;
+  try { s.parse ("/e /E /g"); } catch (...) { good = false; }
+  t.ok (good, "parsed /e /E /g");
+  if (good)
   {
     std::string description = task.get ("description");
     std::vector <Att> annotations;
@@ -68,7 +90,10 @@ int main (int argc, char** argv)
     t.fail ("failed to parse '/e /E /g'");
   }
 
-  if (s.parse ("/from/to/g"))
+  good = true;
+  try { s.parse ("/from/to/g"); } catch (...) { good = false; }
+  t.ok (good, "parsed /from/to/g");
+  if (good)
   {
     std::string description = task.get ("description");
     std::vector <Att> annotations;