libcruft-util/abnf.rl

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void foo (void) { }
%%{
machine rfc5234;
###############################################################################
# RFC5234 ABNF core rules
# ; A-Z / a-z
ALPHA = 0x41..0x5A | 0x61..0x7A;
BIT = '0' | '1';
# any 7-bit US-ASCII character, excluding NUL
CHAR = 0x01..0x7F;
# carriage return
CR = 0x0D;
# linefeed
LF = 0x0A;
# Internet standard newline
CRLF = CR LF;
# controls
CTL = 0x00..0x1F | 0x7F;
# 0-9
DIGIT = 0x30..0x39;
# " (Double Quote)
DQUOTE = 0x22;
HEXDIG = DIGIT | 'A'..'F';
# horizontal tab
HTAB = 0x09;
SP = 0x20;
# white space
WSP = SP | HTAB;
# Use of this linear-white-space rule permits lines containing only white space
# that are no longer legal in mail headers and have caused interoperability
# problems in other contexts.
#
# Do not use when defining mail headers and use with caution in other contexts.
LWSP = (WSP | CRLF WSP)*;
# 8 bits of data
OCTET = any; #0x00..0xFF;
# visible (printing) characters
VCHAR = 0x21..0x7E;
write data;
}%%
int main () {
%%write init;
%%write exec;
}