From 6d2fb0eeb15d6b9774f127517d160137251264a4 Mon Sep 17 00:00:00 2001
From: Markus Wüstenberg
Date: Thu, 22 Oct 2020 09:07:57 +0200
Subject: Add Group function to group Nodes (#29)
---
gomponents.go | 47 ++++++++++++++++++++++++++++++++++++-----------
1 file changed, 36 insertions(+), 11 deletions(-)
(limited to 'gomponents.go')
diff --git a/gomponents.go b/gomponents.go
index 52d5355..c0aa510 100644
--- a/gomponents.go
+++ b/gomponents.go
@@ -64,17 +64,7 @@ func El(name string, children ...Node) NodeFunc {
}
for _, c := range children {
- if p, ok := c.(Placer); ok {
- switch p.Place() {
- case Inside:
- inside.WriteString(c.Render())
- case Outside:
- outside.WriteString(c.Render())
- }
- continue
- }
- // If c doesn't implement Placer, default to outside
- outside.WriteString(c.Render())
+ renderChild(c, &inside, &outside)
}
b.WriteString(inside.String())
@@ -93,6 +83,26 @@ func El(name string, children ...Node) NodeFunc {
}
}
+func renderChild(c Node, inside, outside *strings.Builder) {
+ if g, ok := c.(group); ok {
+ for _, groupC := range g.children {
+ renderChild(groupC, inside, outside)
+ }
+ return
+ }
+ if p, ok := c.(Placer); ok {
+ switch p.Place() {
+ case Inside:
+ inside.WriteString(c.Render())
+ case Outside:
+ outside.WriteString(c.Render())
+ }
+ return
+ }
+ // If c doesn't implement Placer, default to outside
+ outside.WriteString(c.Render())
+}
+
// Attr creates an attr DOM Node.
// If one parameter is passed, it's a name-only attribute (like "required").
// If two parameters are passed, it's a name-value attribute (like `class="header"`).
@@ -156,3 +166,18 @@ func Write(w io.Writer, n Node) error {
_, err := w.Write([]byte(n.Render()))
return err
}
+
+type group struct {
+ children []Node
+}
+
+func (g group) Render() string {
+ panic("cannot render group")
+}
+
+// Group multiple Nodes into one Node. Useful for concatenation of Nodes in variadic functions.
+// The resulting Node cannot Render directly, trying it will panic.
+// Render must happen through a parent element created with El or a helper.
+func Group(children []Node) Node {
+ return group{children: children}
+}
--
cgit 1.4.1