Pretty printing for value schemas

Change-Id: Ic7e3e388d9ac7a5cb22c83a6ae523201796d8ad7

lib/membrane/schema_parser.rb

@@ -6,9 +6,9 @@ module Membrane
 class Membrane::SchemaParser
   class Dsl
     OptionalKeyMarker = Struct.new(:key)
-    DictionaryMarker = Struct.new(:key_schema, :value_schema)
-    EnumMarker = Struct.new(:elem_schemas)
-    TupleMarker = Struct.new(:elem_schemas)
+    DictionaryMarker  = Struct.new(:key_schema, :value_schema)
+    EnumMarker        = Struct.new(:elem_schemas)
+    TupleMarker       = Struct.new(:elem_schemas)
 
     def any
       Membrane::Schema::Any.new
@@ -39,12 +39,25 @@ def self.parse(&blk)
     new.parse(&blk)
   end
 
+  def self.deparse(schema)
+    new.deparse(schema)
+  end
+
   def parse(&blk)
     intermediate_schema = Dsl.new.instance_eval(&blk)
 
     do_parse(intermediate_schema)
   end
 
+  def deparse(schema)
+    case schema
+    when Membrane::Schema::Value
+      schema.value.inspect
+    else
+      schema.inspect
+    end
+  end
+
   private
 
   def do_parse(object)

spec/schema_parser_spec.rb

@@ -3,6 +3,16 @@
 describe Membrane::SchemaParser do
   let(:parser) { Membrane::SchemaParser.new }
 
+  describe "#deparse" do
+    it "should call inspect on the value of a Value schema" do
+      val = "test"
+      val.should_receive(:inspect).twice
+      schema = Membrane::Schema::Value.new(val)
+
+      Membrane::SchemaParser.deparse(schema).should == val.inspect
+    end
+  end
+
   describe "#parse" do
     it "should leave instances derived from Membrane::Schema::Base unchanged" do
       old_schema = Membrane::Schema::ANY