bracket matching with ragel

main.rl

package main
// generate with ragel -G1 -Z main.rl no compile error with -G2 the following;
// main.rl:13[/Users/nathanfisher/workspace/go/src/github.com/nfisher/gir/command/runner/main.go:119:2]: syntax error: unexpected goto at end of statement
// main.go:59[/Users/nathanfisher/workspace/go/src/github.com/nfisher/gir/command/runner/main.go:59:1]: label _again defined and not used

import "fmt"

%%{
  machine graphql_collections;

  ObjectValues := |*
    '}' => { fret; };
  *|;

  main := (
    '{' @{ fcall ObjectValues; }
  )*;
}%%

%%{

prepush {
  fmt.Println("push")
  c := cap(stack)
  l := len(stack)
  if stack == nil || l == c {
    // c+1 avoids c==0
    tmp := make([]int, l, (c+1) * 2)
    copy(tmp, stack)
    stack = tmp
  }
  stack = append(stack, 0)
}

postpop {
  fmt.Println("pop")
  stack = stack[0:len(stack)-1]
}

}%%

%% write data nofinal;

func main() {
  data := []byte(`{{}}`)

  var stack []int
  cs, p, pe, eof := 0, 0, len(data), len(data)
  ts, te, act, top := 0, 0, 0, 0
  _ = ts
  _ = te
  _ = eof
  _ = act
  _ = stack
  _ = top

  %% write init;

  %% write exec;

  if ( cs < %%{ write first_final; }%% ) {
    fmt.Println("parser error")
  }
}