invoke methods at any depth

README.md

@@ -79,8 +79,10 @@ me = name: "David", dob: new Date "26 Apr 1984"
 "{name} was born in {dob.getFullYear}".format(me)
 # "David was born in 1984"
 
-"{pop}{pop}{pop}".format(["one", "two", "three"])
-# "threetwoone"
+sheldon = quip: -> "Bazinga!"
+
+"I've always wanted to go to a goth club. {quip.toUpperCase}".format(sheldon)
+# "I've always wanted to go to a goth club. BAZINGA!"
 ```
 
 ### String.prototype.format.transformers

spec/stringformat_spec.coffee

@@ -52,6 +52,7 @@ describe 'String::format', ->
     '{0.toUpperCase}'.format('iii').should_be 'III'
     '{0.getFullYear}'.format(new Date '26 Apr 1984').should_be '1984'
     '{pop}{pop}{pop}'.format(['one', 'two', 'three']).should_be 'threetwoone'
+    '{quip.toUpperCase}'.format(quip: -> 'Bazinga!').should_be 'BAZINGA!'
 
   String::format.transformers.s = -> 's' unless +this is 1
 

string-format.coffee

@@ -29,8 +29,11 @@ lookup = (object, key) ->
   unless /^(\d+)([.]|$)/.test key
     key = '0.' + key
   while match = /(.+?)[.](.+)/.exec key
-    object = object[match[1]]
+    object = resolve object, match[1]
     key = match[2]
+  resolve object, key
+
+resolve = (object, key) ->
   value = object[key]
   if typeof value is 'function' then value.call object else value