added JSON dumps

Author: glaukiol1

json/json.go

@@ -0,0 +1,53 @@
+package json
+
+import (
+	"encoding/json"
+	"reflect"
+
+	"github.com/go-python/gpython/py"
+)
+
+const dumps_doc = `dumps() -> str
+
+Serialize obj to a JSON formatted str
+`
+
+const module_doc = `
+
+Interaction with JSON.
+
+`
+
+// serialize StringDict into JSON string
+func json_dumps(self py.Object, args py.Tuple) (py.Object, error) {
+	if len(args) == 0 {
+		return nil, py.ExceptionNewf(py.IndexError, "Too few arguments")
+	} else {
+		if reflect.TypeOf(args[0]).String() == "py.StringDict" {
+			data, err := json.Marshal(args[0])
+			if err != nil {
+				return nil, py.ExceptionNewf(py.BaseException, "Failed to marshal JSON.")
+			}
+			return py.String(string(data)), nil
+		} else {
+			return nil, py.ExceptionNewf(py.TypeError, "Wrong type for json.dumps")
+		}
+	}
+}
+
+// Initialise the module
+func init() {
+	methods := []*py.Method{
+		py.MustNewMethod("dumps", json_dumps, 0, dumps_doc),
+	}
+
+	py.RegisterModule(&py.ModuleImpl{
+		Info: py.ModuleInfo{
+			Name: "json",
+			Doc:  module_doc,
+		},
+		Methods: methods,
+		Globals: py.StringDict{},
+	})
+
+}

main

@@ -18,6 +18,7 @@ import (
 	"github.com/go-python/gpython/vm"
 
 	_ "github.com/go-python/gpython/builtin"
+	_ "github.com/go-python/gpython/json"
 	_ "github.com/go-python/gpython/math"
 	_ "github.com/go-python/gpython/sys"
 	_ "github.com/go-python/gpython/time"