feat: token hub

examples/gno.land/p/demo/grc/grc1155/basic_grc1155_token.gno

@@ -345,3 +345,9 @@ func (s *basicGRC1155Token) RenderHome() (str string) {
 
 	return
 }
+
+func (mt *basicGRC1155Token) Getter() MultiTokenGetter {
+	return func() IGRC1155 {
+		return mt
+	}
+}

examples/gno.land/p/demo/grc/grc1155/igrc1155.gno

@@ -38,3 +38,5 @@ type ApprovalForAllEvent struct {
 type UpdateURIEvent struct {
 	URI string
 }
+
+type MultiTokenGetter func() IGRC1155

examples/gno.land/p/demo/grc/grc721/basic_nft.gno

@@ -395,3 +395,10 @@ func (s *basicNFT) RenderHome() (str string) {
 
 	return
 }
+
+// Then add the Getter method to your NFT types
+func (n *basicNFT) Getter() NFTGetter {
+	return func() IGRC721 {
+		return n
+	}
+}

examples/gno.land/p/demo/grc/grc721/igrc721.gno

@@ -26,3 +26,5 @@ const (
 	ApprovalEvent       = "Approval"
 	ApprovalForAllEvent = "ApprovalForAll"
 )
+
+type NFTGetter func() IGRC721

examples/gno.land/r/demo/grc20reg/grc20reg.gno

@@ -73,4 +73,31 @@ func Render(path string) string {
 	}
 }
 
+func Iterate(callback func(key string, token grc20.TokenGetter) bool) {
+	registry.Iterate("", "", func(key string, tokenI interface{}) bool {
+		tokenGetter := tokenI.(grc20.TokenGetter)
+		return callback(key, tokenGetter)
+	})
+}
+
+// iterate through n items starting from the startKey (pagination)
+func IterateN(startKey string, n int, callback func(key string, token grc20.TokenGetter) bool) string {
+	var lastKey string
+	count := 0
+
+	registry.Iterate(startKey, "", func(key string, tokenI interface{}) bool {
+		if count >= n {
+			return true
+		}
+
+		tokenGetter := tokenI.(grc20.TokenGetter)
+		lastKey = key
+		count++
+
+		return callback(key, tokenGetter)
+	})
+
+	return lastKey
+}
+
 const registerEvent = "register"

examples/gno.land/r/matijamarjanovic/tokenhub/gno.mod

@@ -0,0 +1 @@
+module gno.land/r/matijamarjanovic/tokenhub