feat: add server variable extensions

datamodel/low/v3/server.go

@@ -72,6 +72,7 @@ func (s *Server) Build(ctx context.Context, keyNode, root *yaml.Node, _ *index.S
 			variable.Reference = new(low.Reference)
 			_ = low.BuildModel(varNode, &variable)
 			variable.Nodes = low.ExtractNodesRecursive(ctx, varNode)
+			variable.Extensions = low.ExtractExtensions(varNode)
 			if localKeyNode != nil {
 				variable.Nodes.Store(localKeyNode.Line, localKeyNode)
 			}

datamodel/low/v3/server_test.go

@@ -55,6 +55,61 @@ variables:
 	for v := range n.Variables.Value.ValuesFromOldest() {
 		assert.NotNil(t, v.Value.GetKeyNode())
 		assert.NotNil(t, v.Value.GetRootNode())
+		assert.Nil(t, v.Value.GetExtensions())
+	}
+}
+
+func TestServerWithVariableExtension_Build(t *testing.T) {
+	yml := `url: https://pb33f.io
+description: high quality software for developers.
+variables:
+  var1: 
+    default: hello
+    description: a var
+    enum: [one, two]
+    x-transforms:
+        allowMissing: true`
+
+	var idxNode yaml.Node
+	_ = yaml.Unmarshal([]byte(yml), &idxNode)
+	idx := index.NewSpecIndex(&idxNode)
+
+	var n Server
+	err := low.BuildModel(idxNode.Content[0], &n)
+	assert.NoError(t, err)
+	assert.Nil(t, n.GetRootNode())
+
+	err = n.Build(context.Background(), nil, idxNode.Content[0], idx)
+	assert.NoError(t, err)
+	assert.NotNil(t, n.GetRootNode())
+	assert.Equal(t, "ec69dfcf68ad8988f3804e170ee6c4a7ad2e4ac51084796eea93168820827546",
+		low.GenerateHashString(&n))
+
+	assert.Equal(t, "https://pb33f.io", n.URL.Value)
+	assert.Equal(t, "high quality software for developers.", n.Description.Value)
+
+	variable := n.FindVariable("var1").Value
+	assert.Equal(t, "hello", variable.Default.Value)
+	assert.Equal(t, "a var", variable.Description.Value)
+
+	var_extensions := variable.Extensions.First()
+	assert.Equal(t, "x-transforms", var_extensions.Key().Value)
+	variable_pair := variable.Extensions.GetPair(var_extensions.Key())
+	assert.Equal(t, "allowMissing", variable_pair.Value.Value.Content[0].Value)
+	assert.Equal(t, "true", variable_pair.Value.Value.Content[1].Value)
+
+	// test var hash
+	s := n.FindVariable("var1")
+	assert.Equal(t, "00eef99ee4a7b746be7b4ccdece59c5a96222c6206f846fafed782c9f3f9b46b",
+		low.GenerateHashString(s.Value))
+
+	assert.Equal(t, 0, orderedmap.Len(n.GetExtensions()))
+
+	// check nodes on variables
+	for v := range n.Variables.Value.ValuesFromOldest() {
+		assert.NotNil(t, v.Value.GetKeyNode())
+		assert.NotNil(t, v.Value.GetRootNode())
+		assert.NotNil(t, v.Value.GetExtensions())
 	}
 }