Various fixes of RDF.Datatype.cast/1 implementations

lib/rdf/datatypes/boolean.ex

@@ -44,12 +44,8 @@ defmodule RDF.Boolean do
         !Decimal.equal?(literal.value, 0)
         |> new()
 
-      is_xsd_double(datatype) or is_xsd_float(datatype) ->
-        literal.value not in [0.0, :nan]
-        |> new()
-
       RDF.Numeric.type?(datatype) ->
-        literal.value
+        literal.value not in [0, 0.0, :nan]
         |> new()
 
       true ->

lib/rdf/datatypes/integer.ex

@@ -36,9 +36,10 @@ defmodule RDF.Integer do
         new(1)
 
       is_xsd_string(datatype) ->
-        literal.value
-        |> new()
-        |> canonical()
+        case Integer.parse(literal.value) do
+          {value, _} -> new(value)
+          _          -> nil
+        end
 
       is_xsd_decimal(datatype) ->
         literal.value

test/unit/datatypes/boolean_test.exs

@@ -64,6 +64,7 @@ defmodule RDF.BooleanTest do
     test "casting an integer" do
       assert RDF.integer(0)  |> RDF.Boolean.cast() == RDF.false
       assert RDF.integer(1)  |> RDF.Boolean.cast() == RDF.true
+      assert RDF.integer(42) |> RDF.Boolean.cast() == RDF.true
     end
 
     test "casting a decimal" do

test/unit/datatypes/double_test.exs

@@ -74,6 +74,7 @@ defmodule RDF.DoubleTest do
     test "casting a string" do
       assert RDF.string("1.0")    |> RDF.Double.cast() == RDF.double("1.0E0")
       assert RDF.string("3.14")   |> RDF.Double.cast() == RDF.double("3.14E0")
+      assert RDF.string("3.14E0") |> RDF.Double.cast() == RDF.double("3.14E0")
     end
 
     test "casting an integer" do

test/unit/datatypes/integer_test.exs

@@ -29,6 +29,8 @@ defmodule RDF.IntegerTest do
 
     test "casting a string" do
       assert RDF.string("0")    |> RDF.Integer.cast() == RDF.integer(0)
+      assert RDF.string("042")  |> RDF.Integer.cast() == RDF.integer(42)
+      assert RDF.string("3.14") |> RDF.Integer.cast() == RDF.integer(3)
     end
 
     test "casting an decimal" do