Added new extraction functions to control extensions

New extraction functions added (that just wrap the old ones). The difference here is that the extensions can be included or ignored now. This has been added to address issue #24 where header keys can in fact include an extension prefix.

Signed-off-by: Dave Shanley <dave@quobix.com>

datamodel/low/extraction_functions_test.go

@@ -973,6 +973,106 @@ one:
 
 }
 
+func TestExtractMap_NoLookupWithExtensions(t *testing.T) {
+
+	yml := `components:`
+
+	var idxNode yaml.Node
+	mErr := yaml.Unmarshal([]byte(yml), &idxNode)
+	assert.NoError(t, mErr)
+	idx := index.NewSpecIndex(&idxNode)
+
+	yml = `x-hey: you
+one:
+  x-choo: choo`
+
+	var cNode yaml.Node
+	e := yaml.Unmarshal([]byte(yml), &cNode)
+	assert.NoError(t, e)
+
+	things, err := ExtractMapNoLookupExtensions[*test_Good](cNode.Content[0], idx, true)
+	assert.NoError(t, err)
+	assert.Len(t, things, 2)
+
+	for k, v := range things {
+		if k.Value == "x-hey" {
+			continue
+		}
+		assert.Equal(t, "one", k.Value)
+		assert.Len(t, v.ValueNode.Content, 2)
+	}
+}
+
+func TestExtractMap_NoLookupWithoutExtensions(t *testing.T) {
+
+	yml := `components:`
+
+	var idxNode yaml.Node
+	mErr := yaml.Unmarshal([]byte(yml), &idxNode)
+	assert.NoError(t, mErr)
+	idx := index.NewSpecIndex(&idxNode)
+
+	yml = `x-hey: you
+one:
+  x-choo: choo`
+
+	var cNode yaml.Node
+	e := yaml.Unmarshal([]byte(yml), &cNode)
+	assert.NoError(t, e)
+
+	things, err := ExtractMapNoLookupExtensions[*test_Good](cNode.Content[0], idx, false)
+	assert.NoError(t, err)
+	assert.Len(t, things, 1)
+
+	for k, _ := range things {
+		assert.Equal(t, "one", k.Value)
+	}
+}
+
+func TestExtractMap_WithExtensions(t *testing.T) {
+
+	yml := `components:`
+
+	var idxNode yaml.Node
+	mErr := yaml.Unmarshal([]byte(yml), &idxNode)
+	assert.NoError(t, mErr)
+	idx := index.NewSpecIndex(&idxNode)
+
+	yml = `x-hey: you
+one:
+  x-choo: choo`
+
+	var cNode yaml.Node
+	e := yaml.Unmarshal([]byte(yml), &cNode)
+	assert.NoError(t, e)
+
+	things, _, _, err := ExtractMapExtensions[*test_Good]("one", cNode.Content[0], idx, true)
+	assert.NoError(t, err)
+	assert.Len(t, things, 1)
+}
+
+func TestExtractMap_WithoutExtensions(t *testing.T) {
+
+	yml := `components:`
+
+	var idxNode yaml.Node
+	mErr := yaml.Unmarshal([]byte(yml), &idxNode)
+	assert.NoError(t, mErr)
+	idx := index.NewSpecIndex(&idxNode)
+
+	yml = `x-hey: you
+one:
+  x-choo: choo`
+
+	var cNode yaml.Node
+	e := yaml.Unmarshal([]byte(yml), &cNode)
+	assert.NoError(t, e)
+
+	things, _, _, err := ExtractMapExtensions[*test_Good]("one", cNode.Content[0], idx, false)
+	assert.NoError(t, err)
+	assert.Len(t, things, 0)
+}
+
 func TestExtractMapFlatNoLookup_Ref(t *testing.T) {
 
 	yml := `components: