added delay to parser

gallery/doc_examples.typ

@@ -267,6 +267,20 @@
     @enduml
     ```
   ),
+  (
+    [Delay],
+    ```
+    @startuml
+
+    Alice -> Bob: Authentication Request
+    ...
+    Bob --> Alice: Authentication Response
+    ...5 minutes later...
+    Bob --> Alice: Good Bye !
+
+    @enduml
+    ```
+  ),
   (
     [Space],
     ```

src/parser.typ

@@ -1,6 +1,6 @@
 #import "diagram.typ": diagram, _par, _evt, _gap
 #import "participant.typ": SHAPES
-#import "separator.typ": _sep
+#import "separator.typ": _sep, _delay
 #import "sequence.typ": _seq, _ret
 #import "group.typ": _grp, _alt
 #import "note.typ": _note, SIDES
@@ -384,6 +384,19 @@
   return _gap(size: size)
 }
 
+#let is-delay-stmt(line) = {
+  return line.starts-with("...")
+}
+
+#let parse-delay-stmt(line) = {
+  if line == "..." {
+    return _delay()
+  }
+  let m = line.match(regex("\.\.\.\s*(.*?)\s*\.\.\."))
+  let name = m.captures.first()
+  return _delay(name: name)
+}
+
 #let is-sep-stmt(line) = {
   return line.starts-with("==") and line.ends-with("==")
 }
@@ -961,6 +974,8 @@
       elmts += parse-par-stmt(line)
     } else if is-gap-stmt(line) {
       elmts += parse-gap-stmt(line)
+    } else if is-delay-stmt(line) {
+      elmts += parse-delay-stmt(line)
     } else if is-sep-stmt(line) {
       elmts += parse-sep-stmt(line)
     } else if is-evt-stmt(line) {