added name anchor to ALU

src/elements/alu.typ

@@ -24,6 +24,7 @@
     draw.anchor("south", (p2, 50%, p3))
     draw.anchor("west", (p0, 50%, p3))
     draw.anchor("east", (p1, 50%, p2))
+    draw.anchor("name", (p5, 50%, (p1, 50%, p2)))
   })
 
   let f2 = add-port(id, "west", (id: "in1"), (p0, 50%, p6))

src/elements/element.typ

@@ -1,5 +1,6 @@
 #import "@preview/cetz:0.2.2": draw, coordinate
 #import "ports.typ": add-ports, add-port
+#import "../util.typ"
 
 #let find-port(ports, id) = {
   for (side, side-ports) in ports {
@@ -115,7 +116,7 @@
   if (name != none) {
     draw.content(
       (name: id, anchor: name-anchor),
-      anchor: name-anchor,
+      anchor: if name-anchor in util.valid-anchors {name-anchor} else {"center"},
       padding: 0.5em,
       align(center)[*#name*]
     )

src/util.typ

@@ -69,3 +69,8 @@
     south-west: "north-west"
   ).at(anchor)
 }
+
+#let valid-anchors = (
+  "center", "north", "east", "west", "south",
+  "north-east", "north-west", "south-east", "south-west"
+)