A3t

- Implemented first pass as getFilterExpression.

src/A3t.cpp

@@ -510,6 +510,80 @@ Tree* A3t::captureFirst (const std::string& arg)
   return t;
 }
 
+////////////////////////////////////////////////////////////////////////////////
+const std::string A3t::getFilterExpression () const
+{
+  // Locate and extract the filter elements.
+  std::string filter = "";
+  std::vector <Tree*>::iterator i;
+  for (i = _tree->_branches.begin (); i != _tree->_branches.end (); ++i)
+  {
+    // TODO Insert implicit "and", "(" and ")" operators.
+
+    if ((*i)->hasTag ("FILTER"))
+    {
+      if ((*i)->hasTag ("ID"))
+      {
+        // TODO Construct sequence clause clause.
+        if (filter != "")
+          filter += ' ';
+
+        filter += "<id>";
+      }
+      else if ((*i)->hasTag ("UUID"))
+      {
+        // TODO Construct sequence clause clause.
+        if (filter != "")
+          filter += ' ';
+
+        filter += "<uuid>";
+      }
+      else if ((*i)->hasTag ("ATTMOD"))
+      {
+        // TODO name.mod:value --> name <op> value
+        if (filter != "")
+          filter += ' ';
+
+        filter += "<attmod>";
+      }
+      else if ((*i)->hasTag ("ATTRIBUTE"))
+      {
+        // TODO name:value --> name == value
+        if (filter != "")
+          filter += ' ';
+
+        filter += "<attribute>";
+      }
+      else if ((*i)->hasTag ("TAG"))
+      {
+        // TODO +tag --> _hastag_ tag
+        // TODO -tag --> _notag_ tag
+        if (filter != "")
+          filter += ' ';
+
+        filter += "<tag>";
+      }
+      else if ((*i)->hasTag ("PATTERN"))
+      {
+        // TODO /pattern/ --> description ~ pattern
+        if (filter != "")
+          filter += ' ';
+
+        filter += "<pattern>";
+      }
+      else
+      {
+        if (filter != "")
+          filter += ' ';
+
+        filter += (*i)->attribute ("raw");
+      }
+    }
+  }
+
+  return filter;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // /pattern/
 void A3t::findPattern ()

src/A3t.h

@@ -56,6 +56,11 @@ public:
   void injectDefaults ();
   Tree* captureFirst (const std::string&);
 
+  const std::string getFilterExpression () const;
+
+  // TODO Extract words
+  // TODO Extract modifications
+
 private:
   void findTerminator ();
   void findPattern ();
@@ -68,13 +73,6 @@ private:
   void findModifications ();
   void validate ();
 
-  // TODO Extract filter
-  // TODO Extract words
-  // TODO Extract modifications
-  // TODO Prepare infix
-  // TODO Expand operators
-  // TODO Expand sequence
-
 private:
   Tree*                                    _tree;
   std::multimap <std::string, std::string> _entities;