golang.org/x/mod v0.1.1-0.20191107180719-034126e5016b: module.EscapePath

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify golang.org/x/mod/module.EscapePath in pkg:golang/golang.org/x/mod@v0.1.1-0.20191107180719-034126e5016b
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/mod@v0.1.1-0.20191107180719-034126e5016b
Demonstrate these symbols/APIs:
  - golang.org/x/mod/module.EscapePath

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:ed9de132678b4905a094237b586613a7d5fe0c70f47f69acca717d5a34f39158","contract":["module.EscapePath(\"example.com/MyPkg/SubDir\") escapes uppercase letters with '!' prefix and returns \"example.com/!my!pkg/!sub!dir\" with nil error","module.EscapePath(\"example.com/lowercase/mod\") preserves valid all-lowercase module paths unchanged","module.EscapePath(\"invalid_no_dot/pkg\") rejects invalid module paths lacking a dot in the leading path element with a non-nil error"],"goal":"verify golang.org/x/mod/module.EscapePath in pkg:golang/golang.org/x/mod@v0.1.1-0.20191107180719-034126e5016b","kind":"HOW","packages":["pkg:golang/golang.org/x/mod@v0.1.1-0.20191107180719-034126e5016b"],"schemaVersion":1,"symbols":["golang.org/x/mod/module.EscapePath"]},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/golang.org/x/mod@v0.1.1-0.20191107180719-034126e5016b"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/mod@v0.1.1-0.20191107180719-034126e5016b","symbols":["golang.org/x/mod/module.EscapePath"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.21

require golang.org/x/mod v0.1.1-0.20191107180719-034126e5016b

require golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898 // indirect

golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
golang.org/x/mod v0.1.1-0.20191107180719-034126e5016b h1:GgiSbuUyC0BlbUmHQBgFqu32eiRR/CEYdjOjOd4zE6Y=
golang.org/x/mod v0.1.1-0.20191107180719-034126e5016b/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898 h1:/atklqdjdhuosWIl6AIbOeHJjicWYPqR9bpxqxYG2pA=
golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/mod/module.EscapePath in pkg:golang/golang.org/x/mod@v0.1.1-0.20191107180719-034126e5016b",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/mod@v0.1.1-0.20191107180719-034126e5016b"
  ],
  "symbols": [
    "golang.org/x/mod/module.EscapePath"
  ]
}

package main

import (
	"fmt"
	"os"

	"golang.org/x/mod/module"
)

func main() {
	escaped, err := module.EscapePath("example.com/MyPkg/SubDir")
	if err != nil {
		fmt.Fprintf(os.Stderr, "unexpected error for mixed-case path: %v\n", err)
		os.Exit(1)
	}
	if escaped != "example.com/!my!pkg/!sub!dir" {
		fmt.Fprintf(os.Stderr, "expected example.com/!my!pkg/!sub!dir, got %q\n", escaped)
		os.Exit(1)
	}

	lower, err := module.EscapePath("example.com/lowercase/mod")
	if err != nil {
		fmt.Fprintf(os.Stderr, "unexpected error for lowercase path: %v\n", err)
		os.Exit(1)
	}
	if lower != "example.com/lowercase/mod" {
		fmt.Fprintf(os.Stderr, "expected example.com/lowercase/mod, got %q\n", lower)
		os.Exit(1)
	}

	if _, err := module.EscapePath("invalid_no_dot/pkg"); err == nil {
		fmt.Fprintln(os.Stderr, "expected error for invalid module path without dot in first element, got nil")
		os.Exit(1)
	}
}