csv.tgf

@use char classes digit, printable.

integer    => [ '-' ] digit+.

quote      => '"'.
esc        => '\\'.

escaping   => quote | esc.
unescaped  => printable & ~escaping.
escaped    => esc escaping.
strchar    => unescaped | escaped.
str        => quote strchar* quote.

nullvalue  => null.

val        => integer | str | nullvalue.

eol        => [ '\r' ] '\n'.
row        => val ( ',' val )*.
rows       => row ( eol row )*.

start      => rows.