From 5a29042d3b389a6368aabf9b77d017c4c3f84b1b Mon Sep 17 00:00:00 2001
From: Paul Beckingham <paul@beckingham.net>
Date: Sat, 31 Aug 2013 16:23:57 -0400
Subject: [PATCH] A3t::findTag

- Supports single-word tag add/remove, presence/absence, allowing any non-space
  character in the tag, which is an improvement.
---
 src/parser/A3t.cpp | 30 ++++++++++++++++++++++++++++++
 src/parser/A3t.h   |  1 +
 2 files changed, 31 insertions(+)

diff --git a/src/parser/A3t.cpp b/src/parser/A3t.cpp
index c0065a9ae..db3604dcb 100644
--- a/src/parser/A3t.cpp
+++ b/src/parser/A3t.cpp
@@ -64,6 +64,7 @@ Tree* A3t::parse ()
   findConfigOverride ();
   findSubstitution ();
   findPattern ();
+  findTag ();
 
   validate ();
 
@@ -298,6 +299,35 @@ void A3t::findSubstitution ()
   }
 }
 
+////////////////////////////////////////////////////////////////////////////////
+// +tag
+void A3t::findTag ()
+{
+  std::vector <Tree*>::iterator i;
+  for (i = _tree->_branches.begin (); i != _tree->_branches.end (); ++i)
+  {
+    // Parser override operator.
+    if ((*i)->attribute ("raw") == "--")
+      break;
+
+    std::string raw = (*i)->attribute ("raw");
+    Nibbler n (raw);
+
+    std::string tag;
+    std::string sign;
+    if (n.getN (1, sign)             &&
+        (sign == "+" || sign == "-") &&
+        n.getUntilEOS (tag)          &&
+        tag.find (' ') == std::string::npos)
+    {
+      (*i)->tag ("TAG");
+      Tree* b = (*i)->addBranch (new Tree ("metadata"));
+      b->attribute ("sign", sign);
+      b->attribute ("tag", tag);
+    }
+  }
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // Validate the parse tree.
 void A3t::validate ()
diff --git a/src/parser/A3t.h b/src/parser/A3t.h
index 254017476..4208dc9e9 100644
--- a/src/parser/A3t.h
+++ b/src/parser/A3t.h
@@ -48,6 +48,7 @@ private:
   void findConfigOverride ();
   void findPattern ();
   void findSubstitution ();
+  void findTag ();
   void validate ();
 
 private: