debug

cmd/globdraw/main.go

@@ -1,64 +1,16 @@
 package main
 
 import (
-	"bytes"
 	"flag"
 	"fmt"
 	"github.com/gobwas/glob"
 	"github.com/gobwas/glob/match"
-	"math/rand"
+	"github.com/gobwas/glob/match/debug"
 	"os"
 	"strings"
 	"unicode/utf8"
 )
 
-func draw(pattern string, m match.Matcher) string {
-	return fmt.Sprintf(`digraph G {graph[label="%s"];%s}`, pattern, graphviz(m, fmt.Sprintf("%x", rand.Int63())))
-}
-
-func graphviz(m match.Matcher, id string) string {
-	buf := &bytes.Buffer{}
-
-	switch matcher := m.(type) {
-	case match.BTree:
-		fmt.Fprintf(buf, `"%s"[label="%s"];`, id, matcher.Value.String())
-		for _, m := range []match.Matcher{matcher.Left, matcher.Right} {
-			switch n := m.(type) {
-			case nil:
-				rnd := rand.Int63()
-				fmt.Fprintf(buf, `"%x"[label="<nil>"];`, rnd)
-				fmt.Fprintf(buf, `"%s"->"%x";`, id, rnd)
-
-			default:
-				sub := fmt.Sprintf("%x", rand.Int63())
-				fmt.Fprintf(buf, `"%s"->"%s";`, id, sub)
-				fmt.Fprintf(buf, graphviz(n, sub))
-			}
-		}
-
-	case match.AnyOf:
-		fmt.Fprintf(buf, `"%s"[label="AnyOf"];`, id)
-		for _, m := range matcher.Matchers {
-			rnd := rand.Int63()
-			fmt.Fprintf(buf, graphviz(m, fmt.Sprintf("%x", rnd)))
-			fmt.Fprintf(buf, `"%s"->"%x";`, id, rnd)
-		}
-
-	case match.EveryOf:
-		fmt.Fprintf(buf, `"%s"[label="EveryOf"];`, id)
-		for _, m := range matcher.Matchers {
-			rnd := rand.Int63()
-			fmt.Fprintf(buf, graphviz(m, fmt.Sprintf("%x", rnd)))
-			fmt.Fprintf(buf, `"%s"->"%x";`, id, rnd)
-		}
-
-	default:
-		fmt.Fprintf(buf, `"%s"[label="%s"];`, id, m.String())
-	}
-
-	return buf.String()
-}
-
 func main() {
 	pattern := flag.String("p", "", "pattern to draw")
 	sep := flag.String("s", "", "comma separated list of separators characters")
@@ -70,6 +22,7 @@ func main() {
 	}
 
 	var separators []rune
+	if len(*sep) > 0 {
 		for _, c := range strings.Split(*sep, ",") {
 			if r, w := utf8.DecodeRuneInString(c); len(c) > w {
 				fmt.Println("only single charactered separators are allowed")
@@ -78,6 +31,7 @@ func main() {
 				separators = append(separators, r)
 			}
 		}
+	}
 
 	glob, err := glob.Compile(*pattern, separators...)
 	if err != nil {
@@ -86,5 +40,5 @@ func main() {
 	}
 
 	matcher := glob.(match.Matcher)
-	fmt.Fprint(os.Stdout, draw(*pattern, matcher))
+	fmt.Fprint(os.Stdout, debug.Graphviz(*pattern, matcher))
 }