golang.org/x/net v0.2.0: atom.Body

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.Body in pkg:golang/golang.org/x/net@v0.2.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/net@v0.2.0
Demonstrate these symbols/APIs:
  - golang.org/x/net/html/atom.Body

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:sha256:51867e7265bf82be89952c9c70a67cbe378d17c221efc885e84499bbdb335114","contract":["atom.Body is non-zero and atom.Body.String() returns \"body\"","atom.Lookup([]byte(\"body\")) resolves to atom.Body and atom.String([]byte(\"body\")) returns \"body\"","html.Parse assigns DataAtom == atom.Body on parsed \u003cbody\u003e element nodes"],"goal":"verify golang.org/x/net/html/atom.Body in pkg:golang/golang.org/x/net@v0.2.0","kind":"HOW","packages":["pkg:golang/golang.org/x/net@v0.2.0"],"schemaVersion":1,"symbols":["golang.org/x/net/html/atom.Body"]},"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@v0.2.0"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/net@v0.2.0","symbols":["golang.org/x/net/html/atom.Body"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.20

require golang.org/x/net v0.2.0

golang.org/x/net v0.2.0 h1:sZfSu1wtKLGlWI4ZZayP0ck9Y73K1ynO6gqzTdBVdPU=
golang.org/x/net v0.2.0/go.mod h1:KqCZLdyyvdV855qA2rE3GC2aiw5xGR5TEjj8smXukLY=

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/net/html/atom.Body in pkg:golang/golang.org/x/net@v0.2.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/net@v0.2.0"
  ],
  "symbols": [
    "golang.org/x/net/html/atom.Body"
  ]
}

package main

import (
	"bytes"
	"fmt"
	"os"
	"strings"

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

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

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

	if got := atom.Lookup([]byte("body")); got != atom.Body {
		fmt.Fprintf(os.Stderr, "expected atom.Lookup(\"body\") == atom.Body, got %v\n", got)
		os.Exit(1)
	}

	if got := atom.String([]byte("body")); got != "body" {
		fmt.Fprintf(os.Stderr, "expected atom.String(\"body\") == \"body\", got %q\n", got)
		os.Exit(1)
	}

	doc, err := html.Parse(strings.NewReader("<!DOCTYPE html><html><head><title>T</title></head><body><p>Hello</p></body></html>"))
	if err != nil {
		fmt.Fprintf(os.Stderr, "html.Parse failed: %v\n", err)
		os.Exit(1)
	}

	var bodyNode *html.Node
	var walk func(*html.Node)
	walk = func(n *html.Node) {
		if n.Type == html.ElementNode && n.DataAtom == atom.Body {
			bodyNode = n
			return
		}
		for c := n.FirstChild; c != nil && bodyNode == nil; c = c.NextSibling {
			walk(c)
		}
	}
	walk(doc)

	if bodyNode == nil {
		fmt.Fprintln(os.Stderr, "failed to find element node with DataAtom == atom.Body")
		os.Exit(1)
	}

	if bodyNode.Data != "body" {
		fmt.Fprintf(os.Stderr, "expected bodyNode.Data == \"body\", got %q\n", bodyNode.Data)
		os.Exit(1)
	}

	var buf bytes.Buffer
	if err := html.Render(&buf, bodyNode); err != nil {
		fmt.Fprintf(os.Stderr, "html.Render failed: %v\n", err)
		os.Exit(1)
	}
	if got := buf.String(); got != "<body><p>Hello</p></body>" {
		fmt.Fprintf(os.Stderr, "unexpected rendered body: %q\n", got)
		os.Exit(1)
	}
}