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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.
+;;
+;;  internal.clj
+;;
+;;  Internal functions for 'clojure.contrib.miglayout
+
+(ns clojure.contrib.miglayout.internal
+  (:import (java.awt Container Component)))
+
+(defn format-constraints
+  "Formats constraints expressed as a series of strings, keywords, vectors
+  and/or maps into strings for miglayout."
+  [& constraints]
+  (loop [[c & cs] constraints
+         cv []]
+    (if c
+      (recur cs (concat cv [", "]
+        (cond (or (string? c) (keyword? c))
+              [c]
+              (vector? c)
+              (interpose " " c)
+              (map? c)
+              (apply concat (interpose [", "] (map #(interpose " " %) c)))
+              :else
+              (throw
+               (IllegalArgumentException.
+                (format "unrecognized constraint: %s (%s)" c (class c)))))))
+      (apply str (map #((if (keyword? %) name str) %) (rest cv))))))
+
+(defn component?
+  [x]
+  (instance? Component x))
+
+(defn keyword-item?
+  [x]
+  (#{:layout :column :row} x))
+
+(defn item?
+  [x]
+  (or (component? x) (keyword-item? x)))
+
+(defn constraint?
+  [x]
+  (not (item? x)))