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Grammar railroad diagram

I'm looking at lpeg grammars and it's variants to generate an EBNF understood by https://www.bottlecaps.de/rr/ui using a lpeg/re varaint to do the transformation (see also here edubart/nelua-lang#190), bellow is the output for libs/repreprocess/grammar.relabel .

Start ::=
	chunk ( '!' .  |  ( . *  )  )
chunk ::=
	( statement +  |   )
statement ::=
	( comment  |  if  |  block  |  include  |  define  |  source  |  #xA ) Cl
comment ::=
	Sp * "//" ( '!' #xA . ) *   |  Sp * "/*" ( '!' "*/" . ) *  "*/"
if ::=
	( directive_if Cl chunk elseif ? ( directive_endif  |   ) )
elseif ::=
	( directive_elseif Cl chunk ( Cl ( elseif  |  else ) ) ? )
else ::=
	directive_else Cl chunk
block ::=
	( directive_block_start Cl chunk ( directive_block_end  |   ) )
include ::=
	( directive_include Cl )
define ::=
	( directive_define Cl )
source ::=
	'!' directive '!' "//" '!' "/*" ( '!' #xA . ) +
directive ::=
	directive_if  |  directive_elseif  |  directive_else  |  directive_endif  |  directive_block_start  |  directive_block_end  |  directive_include  |  directive_define  |  directive_unknown
directive_if ::=
	"#if" Sp + WORD ( Sp * "==" Sp * WORD  |   )
directive_elseif ::=
	"#elseif" Sp + WORD ( Sp * "==" Sp * WORD  |   )
directive_else ::=
	"#else"
directive_endif ::=
	"#endif"
directive_block_start ::=
	"#block" Sp + WORD
directive_block_end ::=
	"#endblock"
directive_include ::=
	"#include" Sp + WORD
directive_define ::=
	"#define" Sp + WORD ( Sp + WORD  |   )
directive_unknown ::=
	"#" ( WORD ( '!' #xA . ) * )
Cl ::=
	Sp * #xA ?
Sp ::=
	' '  |  #x9 //%esc_t
WORD ::=
	[a-zA-Z_] [a-zA-Z_0-9] *
HASH ::=
	"#"

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