Fix RDF.Literal.new/1 to handle decimals correctly

CHANGELOG.md

@@ -18,7 +18,9 @@ This project adheres to [Semantic Versioning](http://semver.org/) and
 
 ### Fixed
 
-- language literals were not properly unescaped during Turtle parsing 
+- language literals were not properly unescaped during Turtle parsing
+- `RDF.Literal.new/1` can take decimals and infers the datatype `xsd:decimal` 
+  correctly  
 
 
 [Compare v0.6.0...HEAD](https://github.com/marcelotto/rdf-ex/compare/v0.6.0...HEAD)

lib/rdf/literal.ex

@@ -48,6 +48,7 @@ defmodule RDF.Literal do
   def new(value) when is_boolean(value), do: RDF.Boolean.new(value)
   def new(value) when is_integer(value), do: RDF.Integer.new(value)
   def new(value) when is_float(value),   do: RDF.Double.new(value)
+  def new(%Decimal{} = value),           do: RDF.Decimal.new(value)
 
   def new(%Date{} = value),              do: RDF.Date.new(value)
   def new(%Time{} = value),              do: RDF.Time.new(value)

test/unit/literal_test.exs

@@ -13,6 +13,7 @@ defmodule RDF.LiteralTest do
     RDF.String  => ["foo"],
     RDF.Integer => [42],
     RDF.Double  => [3.14],
+    RDF.Decimal => [Decimal.from_float(3.14)],
     RDF.Boolean => [true, false],
   }
 
@@ -55,6 +56,8 @@ defmodule RDF.LiteralTest do
     test "decimal" do
       assert Literal.new(3.14,   datatype: XSD.decimal) == RDF.Decimal.new(3.14)
       assert Literal.new("3.14", datatype: XSD.decimal) == RDF.Decimal.new("3.14")
+      assert Literal.new(Decimal.from_float(3.14), datatype: XSD.decimal) ==
+               RDF.Decimal.new(Decimal.from_float(3.14))
     end
 
     test "string" do