From d1c4bcea85267597433d07b2b66be69ab961adea Mon Sep 17 00:00:00 2001
From: mfranz <mfranz>
Date: Sat, 17 Mar 2007 15:59:39 +0000
Subject: [PATCH] condition(property) wrapper for the _condition function. See
 $FG_ROOT/Docs/README.condition

---
 Nasal/globals.nas | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Nasal/globals.nas b/Nasal/globals.nas
index e296ab972..65f949171 100644
--- a/Nasal/globals.nas
+++ b/Nasal/globals.nas
@@ -76,6 +76,18 @@ setlistener = func {
 }
 
 
+##
+# Convenience wrapper for the _condition function. Takes a
+# property path string or props.Node object as argument,
+# evaluates the property as <condition> and returns 1 or 0
+# for true/false (see $FG_ROOT/Docs/README.condition).
+#
+condition = func(prop) {
+    if(isa(prop, props.Node)) { prop = prop._g; }
+    elsif(typeof(prop) != "scalar") { return; }
+    return _condition(prop);
+}
+
 ##
 # Returns true if the symbol name is defined in the caller, or the
 # caller's lexical namespace.  (i.e. defined("varname") tells you if