golang.org/x/net v0.0.0-20200324143707-d3edc9973b7e: atom.P

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/net/html/atom.P in pkg:golang/golang.org/x/net@v0.0.0-20200324143707-d3edc9973b7e
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/net@v0.0.0-20200324143707-d3edc9973b7e
Demonstrate these symbols/APIs:
  - golang.org/x/net/html/atom.P

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:sha256:5bc8ca663b37a0b9bda400a5b7723baa13268c059a354da9f18f94efdde8ced0","contract":["atom.P is a non-zero Atom constant whose String() method returns \"p\"","atom.Lookup([]byte(\"p\")) returns atom.P while uppercase or other tag names do not match atom.P"],"goal":"verify golang.org/x/net/html/atom.P in pkg:golang/golang.org/x/net@v0.0.0-20200324143707-d3edc9973b7e","kind":"HOW","packages":["pkg:golang/golang.org/x/net@v0.0.0-20200324143707-d3edc9973b7e"],"schemaVersion":1,"symbols":["golang.org/x/net/html/atom.P"]},"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/net@v0.0.0-20200324143707-d3edc9973b7e"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/net@v0.0.0-20200324143707-d3edc9973b7e","symbols":["golang.org/x/net/html/atom.P"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.21

require golang.org/x/net v0.0.0-20200324143707-d3edc9973b7e

golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/net v0.0.0-20200324143707-d3edc9973b7e h1:3G+cUijn7XD+S4eJFddp53Pv7+slrESplyjG25HgL+k=
golang.org/x/net v0.0.0-20200324143707-d3edc9973b7e/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=

package sample

import (
	"golang.org/x/net/html/atom"
)

// ParagraphAtom returns the atom.P constant representing the HTML <p> element.
func ParagraphAtom() atom.Atom {
	return atom.P
}

// IsParagraphTag reports whether the provided atom equals atom.P.
func IsParagraphTag(a atom.Atom) bool {
	return a == atom.P
}

// ResolveParagraphAtom looks up a lowercase tag name byte slice and reports if it resolves to atom.P.
func ResolveParagraphAtom(tag []byte) (atom.Atom, bool) {
	a := atom.Lookup(tag)
	return a, a == atom.P
}

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/net/html/atom.P in pkg:golang/golang.org/x/net@v0.0.0-20200324143707-d3edc9973b7e",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/net@v0.0.0-20200324143707-d3edc9973b7e"
  ],
  "symbols": [
    "golang.org/x/net/html/atom.P"
  ]
}

package main

import (
	"fmt"
	"os"

	"example.com/sample"
	"golang.org/x/net/html/atom"
)

func main() {
	p := sample.ParagraphAtom()
	if p == 0 || p != atom.P {
		fmt.Fprintf(os.Stderr, "expected non-zero atom.P, got %v\n", p)
		os.Exit(1)
	}

	if p.String() != "p" {
		fmt.Fprintf(os.Stderr, "expected atom.P.String() == \"p\", got %q\n", p.String())
		os.Exit(1)
	}

	if !sample.IsParagraphTag(atom.P) {
		fmt.Fprintln(os.Stderr, "expected IsParagraphTag(atom.P) to be true")
		os.Exit(1)
	}

	if sample.IsParagraphTag(atom.Span) {
		fmt.Fprintln(os.Stderr, "expected IsParagraphTag(atom.Span) to be false")
		os.Exit(1)
	}

	got, ok := sample.ResolveParagraphAtom([]byte("p"))
	if !ok || got != atom.P {
		fmt.Fprintf(os.Stderr, "expected ResolveParagraphAtom(\"p\") to return (atom.P, true), got (%v, %v)\n", got, ok)
		os.Exit(1)
	}

	if _, okUpper := sample.ResolveParagraphAtom([]byte("P")); okUpper {
		fmt.Fprintln(os.Stderr, "expected uppercase \"P\" not to resolve to atom.P")
		os.Exit(1)
	}

	fmt.Println("PASS")
}