feat: ujson

Signed-off-by: Norman Meier <norman@berty.tech>

examples/gno.land/p/demo/ujson/format.gno

@@ -0,0 +1,108 @@
+package ujson
+
+// This package strives to have the same behavior as json.Marshal but does not support all types and returns strings
+
+import (
+	"std"
+	"strconv"
+	"strings"
+
+	"gno.land/p/demo/avl"
+)
+
+type JSONAble interface {
+	ToJSON() string
+}
+
+type FormatKV struct {
+	Key   string
+	Value interface{}
+	Raw   bool
+}
+
+// does not work for slices, use FormatSlice instead
+func FormatAny(p interface{}) string {
+	switch p.(type) {
+	case std.Address:
+		return FormatString(string(p.(std.Address)))
+	case *avl.Tree:
+		return FormatAVLTree(p.(*avl.Tree))
+	case avl.Tree:
+		return FormatAVLTree(&p.(avl.Tree))
+	case JSONAble:
+		return p.(JSONAble).ToJSON()
+	case string:
+		return FormatString(p.(string))
+	case uint64:
+		return FormatUint64(p.(uint64))
+	case uint32:
+		return FormatUint64(uint64(p.(uint32)))
+	case uint:
+		return FormatUint64(uint64(p.(uint)))
+	case int64:
+		return FormatInt64(p.(int64))
+	case int32:
+		return FormatInt64(int64(p.(int32)))
+	case int:
+		return FormatInt64(int64(p.(int)))
+	case float32:
+		panic("float32 not implemented")
+	case float64:
+		panic("float64 not implemented")
+	case bool:
+		return FormatBool(p.(bool))
+	default:
+		return "null"
+	}
+}
+
+func FormatUint64(i uint64) string {
+	return strconv.FormatUint(i, 10)
+}
+
+func FormatInt64(i int64) string {
+	return strconv.FormatInt(i, 10)
+}
+
+func FormatSlice(s []interface{}) string {
+	elems := make([]string, len(s))
+	for i, elem := range s {
+		elems[i] = FormatAny(elem)
+	}
+	return "[" + strings.Join(elems, ",") + "]"
+}
+
+func FormatObject(kv []FormatKV) string {
+	elems := make([]string, len(kv))
+	i := 0
+	for _, elem := range kv {
+		var val string
+		if elem.Raw {
+			val = elem.Value.(string)
+		} else {
+			val = FormatAny(elem.Value)
+		}
+		elems[i] = FormatString(elem.Key) + ":" + val
+		i++
+	}
+	return "{" + strings.Join(elems, ",") + "}"
+}
+
+func FormatBool(b bool) string {
+	if b {
+		return "true"
+	}
+	return "false"
+}
+
+func FormatAVLTree(t *avl.Tree) string {
+	if t == nil {
+		return "{}"
+	}
+	kv := make([]FormatKV, 0, t.Size())
+	t.Iterate("", "", func(key string, value interface{}) bool {
+		kv = append(kv, FormatKV{key, value, false})
+		return false
+	})
+	return FormatObject(kv)
+}

examples/gno.land/p/demo/ujson/gno.mod

@@ -0,0 +1,5 @@
+module gno.land/p/demo/ujson
+
+require (
+    "gno.land/p/demo/avl" v0.0.0-latest
+)