gno.land/r/moul/x/daily/base32demo/v0⧉

1// Package base32demo is a small gnoweb demo of the base32 codec provided by the2// [p/moul/x/daily/base32](/p/moul/x/daily/base32/v0) library: it shows the RFC3// 4648 vectors alongside Crockford, and the forgiving decodes Crockford allows.4//5// It contains no codec logic of its own. Stateless, so Render is deterministic.6package base32demo78import (9	"strings"1011	"gno.land/p/moul/x/daily/base32/v0"12)1314// The RFC 4648 §10 vectors — every partial-group length.15var vectors = []string{"", "f", "fo", "foo", "foob", "fooba", "foobar"}1617// Render renders the demo for gnoweb.18//19//	Render("")       / Render("/") -> the vectors + Crockford forgiveness20//	Render("/<text>")              -> encode that text both ways21func Render(path string) string {22	var b strings.Builder23	b.WriteString("# Base32\n\n")24	b.WriteString("RFC 4648 and Crockford, demoing the ")25	b.WriteString("[`p/moul/x/daily/base32`](/p/moul/x/daily/base32/v0) library.\n\n")2627	if in := parseArg(path); in != "" {28		std, _ := base32.Encode(in)29		ck, _ := base32.EncodeCrockford(in)30		b.WriteString("## `")31		b.WriteString(in)32		b.WriteString("`\n\n- RFC 4648: `")33		b.WriteString(std)34		b.WriteString("`\n- Crockford: `")35		b.WriteString(ck)36		b.WriteString("`\n")37		return b.String()38	}3940	b.WriteString("| input | RFC 4648 | Crockford |\n|---|---|---|\n")41	for _, v := range vectors {42		std, _ := base32.Encode(v)43		ck, _ := base32.EncodeCrockford(v)44		b.WriteString("| ")45		if v == "" {46			b.WriteString("_(empty)_")47		} else {48			b.WriteString("`" + v + "`")49		}50		b.WriteString(" | `")51		b.WriteString(std)52		b.WriteString("` | `")53		b.WriteString(ck)54		b.WriteString("` |\n")55	}5657	b.WriteString("\n## Crockford forgives\n\n")58	enc, _ := base32.EncodeCrockford("hello")59	b.WriteString("`hello` encodes to `")60	b.WriteString(enc)61	b.WriteString("`, and all of these decode back to it:\n\n")62	variants := []string{enc, strings.ToLower(enc), enc[:2] + "-" + enc[2:]}63	for _, v := range variants {64		dec, err := base32.DecodeCrockford(v)65		b.WriteString("- `")66		b.WriteString(v)67		b.WriteString("` → ")68		if err == nil && dec == "hello" {69			b.WriteString("`hello` ✅")70		} else {71			b.WriteString("❌")72		}73		b.WriteString("\n")74	}75	b.WriteString("\n> Crockford folds case, reads `I`/`L` as `1` and `O` as `0`, and ")76	b.WriteString("ignores hyphens — so an identifier survives being read aloud and typed back. ")77	b.WriteString("`U` is left out of the alphabet on purpose.\n")78	return b.String()79}8081func parseArg(path string) string {82	s := strings.TrimSpace(path)83	s = strings.TrimPrefix(s, "/")84	if i := strings.IndexByte(s, '/'); i >= 0 {85		s = s[:i]86	}87	return s88}89