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1. #1rot13demo
2. #2README.md
3. #3# `gno.land/r/moul/x/daily/rot13demo/v0` Interactive gnoweb **demo of the [`p/moul/x/daily/rot13`](https://github.com/moul/gno-contracts/tree/main/p/moul/x/daily/rot13/v0) ROT13 / Caesar library** — it renders an explanation, a worked ROT13 example, and path-driven ROT13 and Caesar transforms. It has no cipher logic of its own. Append text to the path to ROT13 it, e.g. [`/r/moul/x/daily/rot13demo/v0:Uryyb, Tab!`](https://gno.land/r/moul/x/daily/rot13demo/v0:Uryyb,%20Tab!), or use `/caesar/<shift>/<text>` for a general Caesar shift. <!-- BEGIN GNOCONTRACTS FOOTER (generated by `make readmes`; do not edit below) --> --- Part of **[moul/gno-contracts](https://github.com/moul/gno-contracts)** — moul's versioned gno.land contracts. See the repository for the full catalog, build/test tooling, and usage. **Dependency graph:**  > 🧪 **Highly experimental — potentially vibe-coded.** Not audited; may break, change, or be removed at any time. Do not use with anything of value. Full disclaimer: [DISCLAIMER](https://github.com/moul/gno-contracts/blob/main/DISCLAIMER.md). <!-- END GNOCONTRACTS FOOTER -->
4. #4gnomod.toml
5. #5module = "gno.land/r/moul/x/daily/rot13demo/v0" gno = "0.9"
6. #6rot13demo.gno
7. #7// Package rot13demo is a small gnoweb demo of the ROT13 / Caesar cipher // provided by the [p/moul/x/daily/rot13](/p/moul/x/daily/rot13/v0) library: it // renders an explanation, a worked ROT13 example, and interactive path-driven // ROT13 and Caesar transforms. // // It contains no cipher logic of its own — everything comes from `rot13.Rot13` // and `rot13.Caesar`. Render reads its input straight from the gnoweb path. package rot13demo import ( "strconv" "strings" "gno.land/p/moul/x/daily/rot13/v0" ) // hexNibble decodes a single hex digit, returning -1 if invalid. func hexNibble(b byte) int { switch { case b >= '0' && b <= '9': return int(b - '0') case b >= 'a' && b <= 'f': return int(b-'a') + 10 case b >= 'A' && b <= 'F': return int(b-'A') + 10 } return -1 } // percentDecode turns "%20"/"+" style path escapes back into readable text so // gnoweb links with spaces or punctuation round-trip nicely. Invalid escapes // are left verbatim. func percentDecode(s string) string { var sb strings.Builder for i := 0; i < len(s); i++ { c := s[i] switch { case c == '+': sb.WriteByte(' ') case c == '%' && i+2 < len(s): hi, lo := hexNibble(s[i+1]), hexNibble(s[i+2]) if hi >= 0 && lo >= 0 { sb.WriteByte(byte(hi<<4 | lo)) i += 2 } else { sb.WriteByte(c) } default: sb.WriteByte(c) } } return sb.String() } // Render is the gnoweb entry point (not a crossing call). // // Render("") -> explanation + a worked example // Render("/Hello, Gno!") -> the input and its ROT13 // Render("/caesar/3/attack") -> a Caesar shift of 3 applied to "attack" func Render(path string) string { p := strings.TrimPrefix(path, "/") // Caesar sub-path: /caesar/<shift>/<text> if rest, ok := strings.CutPrefix(p, "caesar/"); ok { shiftStr, text, found := strings.Cut(rest, "/") if !found { return renderRoot() + "\n> Usage: `/caesar/<shift>/<text>` — e.g. `/caesar/3/attack%20at%20dawn`\n" } shift, err := strconv.Atoi(shiftStr) if err != nil { return renderRoot() + "\n> `" + shiftStr + "` is not a valid integer shift.\n" } text = percentDecode(text) return renderCaesar(text, shift) } if p == "" { return renderRoot() } return renderRot13(percentDecode(p)) } func renderRoot() string { var sb strings.Builder sb.WriteString("# ROT13\n\n") sb.WriteString("Demo of the [`p/moul/x/daily/rot13`](/p/moul/x/daily/rot13/v0) library — ") sb.WriteString("an on-chain port of Go's classic **ROT13** cipher, the standard-library ") sb.WriteString("`strings.Map` / `io.Reader` teaching example. Each ASCII letter is rotated ") sb.WriteString("13 places through the alphabet; everything else is left alone.\n\n") sb.WriteString("Because the alphabet has 26 letters and 13 is exactly half, **ROT13 is its ") sb.WriteString("own inverse** — encoding twice returns the original text.\n\n") const demo = "Hello, Gno!" enc := rot13.Rot13(demo) sb.WriteString("## Example\n\n") sb.WriteString("| stage | text |\n|---|---|\n") sb.WriteString("| input | `" + demo + "` |\n") sb.WriteString("| ROT13 | `" + enc + "` |\n") sb.WriteString("| ROT13 again | `" + rot13.Rot13(enc) + "` |\n\n") sb.WriteString("## Try it\n\n") sb.WriteString("- `Render(\"/Uryyb, Tab!\")` — decode any text (append it to the path).\n") sb.WriteString("- `Render(\"/caesar/3/attack at dawn\")` — a general Caesar shift.\n\n") sb.WriteString("Or call the library functions directly:\n\n") sb.WriteString("```go\n") sb.WriteString("rot13.Rot13(\"Hello, Gno!\") // " + strconv.Quote(enc) + "\n") sb.WriteString("rot13.Caesar(\"attack\", 3) // " + strconv.Quote(rot13.Caesar("attack", 3)) + "\n") sb.WriteString("rot13.Caesar(\"Hello\", 13) // same as Rot13: " + strconv.Quote(rot13.Caesar("Hello", 13)) + "\n") sb.WriteString("```\n") return sb.String() } func renderRot13(text string) string { enc := rot13.Rot13(text) var sb strings.Builder sb.WriteString("# ROT13\n\n") sb.WriteString("| stage | text |\n|---|---|\n") sb.WriteString("| input | `" + text + "` |\n") sb.WriteString("| ROT13 | `" + enc + "` |\n\n") sb.WriteString("_ROT13 is its own inverse — running it on the output above gives back the input._\n\n") sb.WriteString("[Back to overview](/r/moul/x/daily/rot13demo/v0:)\n") return sb.String() } func renderCaesar(text string, shift int) string { enc := rot13.Caesar(text, shift) var sb strings.Builder sb.WriteString("# Caesar shift " + strconv.Itoa(shift) + "\n\n") sb.WriteString("| stage | text |\n|---|---|\n") sb.WriteString("| input | `" + text + "` |\n") sb.WriteString("| shifted | `" + enc + "` |\n\n") sb.WriteString("_Decode with the opposite shift: `/caesar/" + strconv.Itoa(-shift) + "/...`._\n\n") sb.WriteString("[Back to overview](/r/moul/x/daily/rot13demo/v0:)\n") return sb.String() }
8. #8/gno.MemPackageType
9. #9 MPUserProd