Allow spaces around pipes

Author: nobu

lib/rdoc/markdown.kpeg

@@ -1212,8 +1212,8 @@ TableItem = < (!"|" !@Newline .)+ >
 
 TableLine = ( ( TableAlign:align1 TableAlign2*:aligns {[align1, *aligns] } ):line | TableAlign2+:line ) "|"? @Newline
 	    { line }
-TableAlign2 = "|" TableAlign
-TableAlign = < /:?-+:?/ >
+TableAlign2 = "|" @Sp TableAlign
+TableAlign = < /:?-+:?/ > @Sp
               { text.start_with?(":") ? :left :
                 text.end_with?(":") ? :right : nil
               }

test/rdoc/test_rdoc_markdown.rb

@@ -1065,7 +1065,7 @@ def test_gfm_table
   def test_gfm_table_2
     doc = parse <<~MD
     | Cmd | Returns | Meaning
-    ------|---------|--------
+    ----- | ------- | -------
     |"b"  | boolean | True if file1 is a block device
     "c"   | boolean | True if file1 is a character device
     MD