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|
package examples
import (
"io"
"fmt"
parser "github.com/leodido/ragel-machinery/parser"
)
%%{
machine multiline;
# unsigned alphabet
alphtype uint8;
action on_trailer {
// Collect data each trailer we encounter
m.item = append(m.item, data...)
}
action on_init {
if len(m.item) > 0 {
m.items = append(m.items, string(m.item[:len(m.item)-1]))
}
// Initialize a new item
m.item = make([]byte, 0)
}
t = 10;
main :=
start: (
# Note that corpus can contain trailers - ie., can span more lines in this case.
'$' >on_init (digit | t)+ -> trailer
),
trailer: (
t >on_trailer -> final |
t >on_trailer -> start
);
}%%
%% write data nofinal;
type multilineMachine struct{
// define here your support variables for ragel actions
item []byte
items []string
}
// Exec implements the ragel.Parser interface.
func (m *multilineMachine) Exec(s *parser.State) (int, int) {
// Retrieve previously stored parsing variables
cs, p, pe, eof, data := s.Get()
// Inline FSM code here
%% write exec;
// Update parsing variables
s.Set(cs, p, pe, eof)
return p, pe
}
func (m *multilineMachine) OnErr(c []byte) {
fmt.Println("OnErr")
if len(c) > 0 {
fmt.Println(string(c))
}
}
func (m *multilineMachine) OnEOF(c []byte) {
fmt.Println("OnEOF")
if len(c) > 0 {
fmt.Println(string(c))
}
}
func (m *multilineMachine) OnCompletion() {
fmt.Println("OnCompletion")
if len(m.item) > 0 {
m.items = append(m.items, string(m.item))
}
}
func (m *multilineMachine) Parse(r io.Reader) {
m.items = []string{}
p := parser.New(
parser.ArbitraryReader(r, 10), // How to read the stream
m, // How to parse it
parser.WithStart(%%{ write start; }%%), // Options
)
p.Parse()
}
|
