forked from mirror/glob
80 lines
1.8 KiB
Go
80 lines
1.8 KiB
Go
package main
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import (
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"bytes"
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"flag"
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"fmt"
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"github.com/gobwas/glob"
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"github.com/gobwas/glob/match"
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"math/rand"
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"os"
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"strings"
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)
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func draw(pattern string, m match.Matcher) string {
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return fmt.Sprintf(`digraph G {graph[label="%s"];%s}`, pattern, graphviz(m, fmt.Sprintf("%x", rand.Int63())))
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}
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func graphviz(m match.Matcher, id string) string {
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buf := &bytes.Buffer{}
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switch matcher := m.(type) {
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case match.BTree:
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fmt.Fprintf(buf, `"%s"[label="%s"];`, id, matcher.Value.String())
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for _, m := range []match.Matcher{matcher.Left, matcher.Right} {
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switch n := m.(type) {
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case nil:
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rnd := rand.Int63()
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fmt.Fprintf(buf, `"%x"[label="<nil>"];`, rnd)
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fmt.Fprintf(buf, `"%s"->"%x";`, id, rnd)
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default:
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sub := fmt.Sprintf("%x", rand.Int63())
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fmt.Fprintf(buf, `"%s"->"%s";`, id, sub)
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fmt.Fprintf(buf, graphviz(n, sub))
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}
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}
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case match.AnyOf:
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fmt.Fprintf(buf, `"%s"[label="AnyOf"];`, id)
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for _, m := range matcher.Matchers {
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rnd := rand.Int63()
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fmt.Fprintf(buf, graphviz(m, fmt.Sprintf("%x", rnd)))
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fmt.Fprintf(buf, `"%s"->"%x";`, id, rnd)
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}
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case match.EveryOf:
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fmt.Fprintf(buf, `"%s"[label="EveryOf"];`, id)
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for _, m := range matcher.Matchers {
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rnd := rand.Int63()
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fmt.Fprintf(buf, graphviz(m, fmt.Sprintf("%x", rnd)))
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fmt.Fprintf(buf, `"%s"->"%x";`, id, rnd)
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}
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default:
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fmt.Fprintf(buf, `"%s"[label="%s"];`, id, m.String())
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}
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return buf.String()
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}
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func main() {
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pattern := flag.String("p", "", "pattern to draw")
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sep := flag.String("s", "", "comma separated list of separators")
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flag.Parse()
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if *pattern == "" {
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flag.Usage()
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os.Exit(1)
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}
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glob, err := glob.Compile(*pattern, strings.Split(*sep, ",")...)
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if err != nil {
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fmt.Println("could not compile pattern:", err)
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os.Exit(1)
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}
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matcher := glob.(match.Matcher)
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fmt.Fprint(os.Stdout, draw(*pattern, matcher))
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}
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