fix: single | parsed as (taglink) error

fix #30
fix #23

Author: justinmk

corpus/taglink.txt

@@ -70,8 +70,10 @@ taglink in parentheses
 ================================================================================
 NOT a taglink
 ================================================================================
-
 whitespace |world foo bar|
+	    |
+	rx  |
+	rx  |	ry
 adjacent || |||
 table-borders |=========| |---------|
 
@@ -93,6 +95,16 @@ Note: ":autocmd" can...
         (MISSING "|"))
       (word)
       (word))
+    (line
+      (word
+        (MISSING "_word_common_token5")))
+    (line
+      (word)
+      (ERROR))
+    (line
+      (word)
+      (word)
+      (word))
     (line
       (word)
       (word)

grammar.js

@@ -68,7 +68,9 @@ module.exports = grammar({
       // NOT optionlink: single char surrounded by "'".
       seq("'", token.immediate(/[^'\n\t ]/), token.immediate("'")),
       // NOT taglink: single "|".
-      /[\t ]\|[\t ]/,
+      /\|[\t ]/,
+      // NOT taglink: "|foo".
+      seq('|', /[^|\n\t ]+/),
       // NOT taglink: "||".
       /\|\|*/,
       // NOT argument: "{}".