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Peeked some parser stuff from gdnsd

This commit is contained in:
Miek Gieben 2011-07-19 17:49:51 +02:00
parent b13a2d6ad9
commit c8975950bd
2 changed files with 91736 additions and 1542 deletions
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93229
zparse.go
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49
zparse.rl
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@ -1,7 +1,8 @@
package dns
// Parse RRs
// With the thankful help of gdnsd and the Go examples for Ragel
// With the thankful help of gdnsd and the Go examples for Ragel.
//
import (
"os"
@ -75,23 +76,43 @@ func Zparse(q io.Reader) (z *Zone, err os.Error) {
z = new(Zone)
data := string(buf)
cs, p, pe, eof := 0, 0, len(data), len(data)
// cs, p, pe, eof := 0, 0, len(data), len(data)
cs, p, pe := 0, 0, len(data)
brace := false
lines := 0
mark := 0
hdr := new(RR_Header)
tok := newToken()
var rr RR
%%{
# can't do comments yet TODO
action mark { mark = p }
action qname { hdr.Name = data[mark:p] }
action qclass { hdr.Class = Str_class[data[mark:p]] }
action defTtl { /* ... */ }
action setTtl { ttl, _ := strconv.Atoi(data[mark:p]); hdr.Ttl = uint32(ttl) }
action number { tok.pushInt(data[mark:p]) }
action text { tok.pushString(data[mark:p]) }
action textblank { tok.pushString(data[mark:p]) }
action set { z.Push(rr); tok.reset(); println("setting") }
action mark { mark = p }
action qname { hdr.Name = data[mark:p] }
action qclass { hdr.Class = Str_class[data[mark:p]] }
action defTtl { /* ... */ }
action setTtl { ttl, _ := strconv.Atoi(data[mark:p]); hdr.Ttl = uint32(ttl) }
action number { tok.pushInt(data[mark:p]) }
action text { tok.pushString(data[mark:p]) }
action textblank { tok.pushString(data[mark:p]) }
action set { z.Push(rr); tok.reset(); println("setting") }
action openBrace { if brace { println("Brace already open")} ; brace = true }
action closeBrace { if !brace { println("Brace already closed")}; brace = false }
action brace { brace }
action linecount { lines++ }
# Newlines
nl = [\n]+ $linecount;
# Comments, entire line. Shorter comments are handled in the
# 'bl' definition below.
comment = ';' [^\n]*;
bl = (
[ \t]+
| '(' $openBrace
| ')' $closeBrace
| (comment? nl)+ when brace
)+ %mark;
action qtype {
i := Str_rr[data[mark:p]]
@ -106,7 +127,6 @@ func Zparse(q io.Reader) (z *Zone, err os.Error) {
qclass = ('IN'i|'CS'i|'CH'i|'HS'i|'ANY'i|'NONE'i) %qclass;
ttl = digit+ >mark;
bl = [ \t]+ %mark;
qname = [\-a-zA-Z0-9.\\_]+ %qname;
# If I use this in the definitions at the end, things break.
# 6l seems to hang when compiling the resulting .go file...
@ -114,7 +134,6 @@ func Zparse(q io.Reader) (z *Zone, err os.Error) {
tb = [\-a-zA-Z0-9.\\/+=: ]+ $1 %0 %textblank;
t = [\-a-zA-Z0-9.\\/+=:]+ $1 %0 %text;
n = [0-9]+ $1 %0 %number;
comment = /^;/;
lhs = qname? bl %defTtl (
(ttl %setTtl bl (qclass bl)?)
@ -138,7 +157,7 @@ func Zparse(q io.Reader) (z *Zone, err os.Error) {
) %set;
rr = lhs rhs;
main := rr+;
main := (rr? bl? ((comment? nl) when !brace))*;
write init;
write exec;