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This parses stuff

This commit is contained in:
Miek Gieben 2011-07-11 16:17:53 +02:00
parent 82ff70262b
commit 8c477c5c60
1 changed files with 51 additions and 35 deletions
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86
dns.l
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@ -1,55 +1,71 @@
package main
import "fmt"
CHAR [A-Za-z0-9/+=a.{}]
WS [ \t]
BLANK [ \t]
%x qclass qtype rdata
%s classttl rest
%%
<*>;.*\n {
// Comments aren't interesting
YOUT("NL\n")
BEGIN(INITIAL)
}
<*>%$ {
// Empty lines
YOUT("\n")
BEGIN(INITIAL)
}
^{CHAR}+ {
<INITIAL>^{CHAR}+ {
YOUT("qname")
BEGIN(qclass)
BEGIN(classttl)
}
WS YOUT(" ")
<qclass>WS YOUT(" ")
<qtype>WS YOUT(" ")
<rdata>WS YOUT(" ")
;.*\n {
YOUT("comment\n")
BEGIN(INITIAL)
<INITIAL>^{BLANK}+ {
YOUT("qname.")
// Return qname TOK, and fix yytext
BEGIN(classttl)
}
<qclass>;.*\n {
YOUT("comment\n")
BEGIN(INITIAL)
<classttl>{CHAR}+ {
switch yycheckit(yytext) {
case 0:
YOUT("{qtype:" + yytext + "}")
BEGIN(rest)
case 1:
YOUT("qclass")
case 2:
YOUT("ttl")
}
}
<qtype>;.*\n {
YOUT("comment\n")
BEGIN(INITIAL)
<classttl>{BLANK}+ {
YOUT(".")
}
<rdata>;.*\n {
YOUT("comment\n")
<rest>{CHAR}+ {
YOUT("str")
}
<rest>{BLANK}+ {
YOUT(".")
}
<rest>\n {
YOUT("NL\n")
BEGIN(INITIAL)
}
<qclass>{CHAR}+ {
YOUT("qclass/ttl")
BEGIN(qtype)
}
<qtype>{CHAR}+ {
YOUT("qtype")
BEGIN(rdata)
}
<rdata>{CHAR}+ {
YOUT("rdata")
}
<rdata>\n {
YOUT("END\n\n")
BEGIN(INITIAL)
}
%%
func yycheckit(s string) int {
if s == "IN" {
return 1
}
if s[0] >= '0' && s[0] <= '9' {
return 2
}
return 0
}
func YOUT(s string) {
fmt.Printf("%s", s)