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+;;  Copyright (c) Stephen C. Gilardi. All rights reserved. The use and
+;;  distribution terms for this software are covered by the Common Public
+;;  License 1.0 (http://opensource.org/licenses/cpl.php) which can be found
+;;  in the file CPL.TXT at the root of this distribution. By using this
+;;  software in any fashion, you are agreeing to be bound by the terms of
+;;  this license. You must not remove this notice, or any other, from this
+;;  software.
+;;
+;;  clojure.contrib.miglayout.internal
+;;
+;;  Internal functions for 'clojure.contrib.miglayout
+;;
+;;  scgilardi (gmail)
+;;  Created 13 October 2008
+
+(ns clojure.contrib.miglayout.internal
+  (:import (java.awt Component))
+  (:use (clojure.contrib except fcase)))
+
+(defn format-constraint
+  "Returns a vector of vectors representing one or more constraints
+  separated by commas. Constraints may be specified in Clojure using
+  strings, keywords, vectors, and/or maps."
+  [c]
+  [[", "]
+   (fcase #(%1 %2) c
+     string?  [c]
+     keyword? [c]
+     vector?  (interpose " " c)
+     map?     (apply concat (interpose [", "] (map #(interpose " " %) c)))
+     (throwf IllegalArgumentException
+             "unrecognized constraint: %s (%s)" c (class c)))])
+
+(defn the-str
+  "Returns the string for x--its name if it's a keyword."
+  [x]
+  ((if (keyword? x) name str) x))
+
+(defn format-constraints
+  "Returns a string representing all the constraints for one keyword-item
+  or component formatted for miglayout."
+  [& constraints]
+  (apply str
+         (map the-str
+              (rest (reduce concat []
+                            (mapcat format-constraint constraints))))))
+
+(defn component?
+  "Returns true if x is a java.awt.Component"
+  [x]
+  (instance? Component x))
+
+(defn constraint?
+  "Returns true if x is not a keyword-item or component"
+  [x]
+  (not
+   (or (component? x)
+       (#{:layout :column :row} x))))
+
+(defn parse-item-constraints
+  "Iterates over args and builds a map containing :keywords, a map of from
+  keyword-item to constraints string and :components, a vector of vectors
+  each associating a component with its constraints string. :components is
+  a vector because ordering of components matters."
+  [& args]
+  (loop [[item & args] args
+         item-constraints {:components [] :keyword-items {}}]
+    (if item
+      (let [[constraints args] (split-with constraint? args)]
+        (recur args
+          (update-in
+           item-constraints
+           [(if (component? item) :components :keyword-items)]
+           conj [item (apply format-constraints constraints)])))
+      item-constraints)))