golang.org/x/net v0.0.0-20190813141303-74dc4d7220e7: 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@v0.0.0-20190813141303-74dc4d7220e7
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/net@v0.0.0-20190813141303-74dc4d7220e7
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:sha256:9dd5cabf8078f8d6374685e0fd4e0d8c490205f9e7a0e760f4936c5b082ea54b","contract":["atom.P represents the HTML paragraph tag atom with a non-zero integer value and 'p' string representation","atom.Lookup maps lowercase byte slice 'p' to atom.P and rejects uppercase or non-paragraph tags"],"goal":"verify golang.org/x/net/html/atom.P in pkg:golang/golang.org/x/net@v0.0.0-20190813141303-74dc4d7220e7","kind":"HOW","packages":["pkg:golang/golang.org/x/net@v0.0.0-20190813141303-74dc4d7220e7"],"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@v0.0.0-20190813141303-74dc4d7220e7"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/net@v0.0.0-20190813141303-74dc4d7220e7","symbols":["golang.org/x/net/html/atom.P"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.21

require golang.org/x/net v0.0.0-20190813141303-74dc4d7220e7

golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/net v0.0.0-20190813141303-74dc4d7220e7 h1:fHDIZ2oxGnUZRN6WgWFCbYBjH9uqVPRCUVUDhs0wnbA=
golang.org/x/net v0.0.0-20190813141303-74dc4d7220e7/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=

package sample

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

// IsParagraph checks whether the given Atom is atom.P.
func IsParagraph(a atom.Atom) bool {
	return a == atom.P
}

// ParagraphString returns the canonical tag string of atom.P.
func ParagraphString() string {
	return atom.P.String()
}

// MatchParagraphByteSlice resolves a byte slice to an Atom and reports whether it equals atom.P.
func MatchParagraphByteSlice(b []byte) (atom.Atom, bool) {
	resolved := atom.Lookup(b)
	return resolved, resolved == atom.P
}

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/net/html/atom.P in pkg:golang/golang.org/x/net@v0.0.0-20190813141303-74dc4d7220e7",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/net@v0.0.0-20190813141303-74dc4d7220e7"
  ],
  "symbols": [
    "golang.org/x/net/html/atom.P"
  ]
}

package main

import (
	"fmt"
	"os"

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

func main() {
	if atom.P == 0 {
		fmt.Fprintln(os.Stderr, "expected non-zero atom.P")
		os.Exit(1)
	}

	if sample.ParagraphString() != "p" {
		fmt.Fprintf(os.Stderr, "expected 'p', got %q\n", sample.ParagraphString())
		os.Exit(1)
	}

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

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

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

	if _, matchedUpper := sample.MatchParagraphByteSlice([]byte("P")); matchedUpper {
		fmt.Fprintln(os.Stderr, "expected uppercase 'P' not to match atom.P")
		os.Exit(1)
	}

	fmt.Println("PASS")
}