Document [end] component

diagrams/diagrams.py

@@ -104,6 +104,9 @@ def __init__(self, name, diagram):
 
 # region: individual components
 def generate_diagram(name, *modifiers):
+    if len(modifiers) == 0:
+        return NamedDiagram(name, Diagram(Sequence(name)))
+
     return NamedDiagram(
         name,
         Diagram(Sequence(
@@ -143,6 +146,7 @@ def generate_diagram(name, *modifiers):
     copy(ignore_count),
 )))
 unix_timestamp = generate_diagram('unix_timestamp', copy(unix_timestamp_precision), copy(sign))
+end = generate_diagram('end')
 
 format_description = Comment('format_description')
 
@@ -170,7 +174,7 @@ def generate_diagram(name, *modifiers):
 all = [
     abbreviated_v1, abbreviated_v2,
     day, month, ordinal, weekday, week_number, year, hour, minute, period, second, subsecond,
-    offset_hour, offset_minute, offset_second, first, optional, ignore, unix_timestamp
+    offset_hour, offset_minute, offset_second, first, optional, ignore, unix_timestamp, end
 ]
 
 for item in all:

src/api/format-description.md

@@ -140,6 +140,15 @@ ASCII whitespace characters.
   `format_description` refers to a complete format description that is nested; whitespace (including
   leading and trailing) is significant.
 
+- **End of input**: `[end]`
+
+  ![syntax for end component](../diagrams/end.svg#rr)
+
+  This component indicates the end of the input. When formatting, it is a no-op. When parsing, it
+  will only succeed if there is no further input. It does not consume any input.
+
+  There is no customization available for this component.
+
 - **Clock hour**: `[hour]`
 
   ![syntax for hour component](../diagrams/hour.svg#rr)