New extension: strike through with two tildes [jgm/peg-markdown]

See https://github.com/jgm/peg-markdown/commit/7cc5b73

output.go

@@ -212,6 +212,8 @@ func (w *htmlOut) elem(elt *element) *htmlOut {
 		w.inline("<em>", elt)
 	case STRONG:
 		w.inline("<strong>", elt)
+	case STRIKE:
+		w.inline("<del>", elt)
 	case LIST:
 		w.children(elt)
 	case RAW:

parser.leg

@@ -71,6 +71,7 @@ const (
 	HTML
 	EMPH
 	STRONG
+	STRIKE
 	PLAIN
 	PARA
 	LISTITEM
@@ -480,6 +481,7 @@ Inline  = Str
         | Space
         | Strong
         | Emph
+        | Strike
         | Image
         | Link
         | NoteReference
@@ -532,6 +534,7 @@ Symbol =    < SpecialChar >
 UlOrStarLine =  (UlLine | StarLine) { $$ = p.mkString(yytext) }
 StarLine =      < "****" '*'* > | < Spacechar '*'+ &Spacechar >
 UlLine   =      < "____" '_'* > | < Spacechar '_'+ &Spacechar >
+TildeLine =     < "~~~~" '~'* > | < Spacechar '~'+ &Spacechar >
 
 Emph =      EmphStar | EmphUl
 
@@ -567,6 +570,15 @@ StrongUl   =    "__" !Whitespace
                 "__"
                 { $$ = p.mkList(STRONG, a) }
 
+TwoTildeOpen =  !TildeLine "~~" !Spacechar !Newline
+TwoTildeClose = !Spacechar !Newline a:Inline "~~" { $$ = a; }
+
+Strike = TwoTildeOpen
+         a:StartList
+         ( !TwoTildeClose Inline { a = cons($$, a) } )*
+         TwoTildeClose { a = cons($$, a) }
+         { $$ = p.mkList(STRIKE, a) }
+
 Image = '!' ( ExplicitLink | ReferenceLink )
         {	if $$.key == LINK {
 			$$.key = IMAGE
@@ -702,7 +714,7 @@ Nonspacechar =  !Spacechar !Newline .
 Newline =       '\n' | '\r' '\n'?
 Sp =            Spacechar*
 Spnl =          Sp (Newline Sp)?
-SpecialChar =   '*' | '_' | '`' | '&' | '[' | ']' | '(' | ')' | '<' | '!' | '#' | '\\' | '\'' | '"' | ExtendedSpecialChar
+SpecialChar =   '~' | '*' | '_' | '`' | '&' | '[' | ']' | '(' | ')' | '<' | '!' | '#' | '\\' | '\'' | '"' | ExtendedSpecialChar
 NormalChar =    !( SpecialChar | Spacechar | Newline ) .
 Alphanumeric = [0-9A-Za-z] | '\200' | '\201' | '\202' | '\203' | '\204' | '\205' | '\206' | '\207' | '\210' | '\211' | '\212' | '\213' | '\214' | '\215' | '\216' | '\217' | '\220' | '\221' | '\222' | '\223' | '\224' | '\225' | '\226' | '\227' | '\230' | '\231' | '\232' | '\233' | '\234' | '\235' | '\236' | '\237' | '\240' | '\241' | '\242' | '\243' | '\244' | '\245' | '\246' | '\247' | '\250' | '\251' | '\252' | '\253' | '\254' | '\255' | '\256' | '\257' | '\260' | '\261' | '\262' | '\263' | '\264' | '\265' | '\266' | '\267' | '\270' | '\271' | '\272' | '\273' | '\274' | '\275' | '\276' | '\277' | '\300' | '\301' | '\302' | '\303' | '\304' | '\305' | '\306' | '\307' | '\310' | '\311' | '\312' | '\313' | '\314' | '\315' | '\316' | '\317' | '\320' | '\321' | '\322' | '\323' | '\324' | '\325' | '\326' | '\327' | '\330' | '\331' | '\332' | '\333' | '\334' | '\335' | '\336' | '\337' | '\340' | '\341' | '\342' | '\343' | '\344' | '\345' | '\346' | '\347' | '\350' | '\351' | '\352' | '\353' | '\354' | '\355' | '\356' | '\357' | '\360' | '\361' | '\362' | '\363' | '\364' | '\365' | '\366' | '\367' | '\370' | '\371' | '\372' | '\373' | '\374' | '\375' | '\376' | '\377'
 AlphanumericAscii = [A-Za-z0-9]
@@ -1032,6 +1044,7 @@ var keynames = [numVAL]string{
 	HTML:           "HTML",
 	EMPH:           "EMPH",
 	STRONG:         "STRONG",
+	STRIKE:         "STRIKE",
 	PLAIN:          "PLAIN",
 	PARA:           "PARA",
 	LISTITEM:       "LISTITEM",

portid

@@ -1 +1 @@
-208
+9629df92a0de