golang.org/x/net v0.61.0: 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@v0.61.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/net@v0.61.0
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:e5fa709d738bc1130cbb4ba01a0488afc81cfa6ef751b71148e31b77f953f8dd","contract":["atom.Body is a non-zero Atom representing the HTML body tag with string value \"body\"","atom.Lookup with byte slice \"body\" returns atom.Body and lookup with uppercase \"BODY\" returns 0","atom.String with byte slice \"body\" returns string \"body\"","html.Parse resolves the \u003cbody\u003e element node with DataAtom equal to atom.Body and Data equal to \"body\"","html.Node constructed with DataAtom atom.Body renders as valid HTML body element","atom.Body is distinct from other HTML tag atoms including atom.Head, atom.Html, and atom.Div"],"goal":"verify golang.org/x/net/html/atom.Body in pkg:golang/golang.org/x/net@v0.61.0","kind":"HOW","packages":["pkg:golang/golang.org/x/net@v0.61.0"],"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@v0.61.0"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/net@v0.61.0","symbols":["golang.org/x/net/html/atom.Body"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.26.0

require golang.org/x/net v0.61.0

golang.org/x/net v0.61.0 h1:RR+6j/BTBCrggOLugxa+66R8FvoN6MHlzDlZIbN9YFw=
golang.org/x/net v0.61.0/go.mod h1:WgDCOTH8iwtB66T4/GfI94AHo/hhdb7Hah9NDseQfiI=

package main

import (
	"bytes"
	"fmt"
	"strings"

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

func main() {
	// Inspect atom.Body constant and string conversion
	fmt.Printf("atom.Body value: %d\n", uint32(atom.Body))
	fmt.Printf("atom.Body string: %q\n", atom.Body.String())

	// Lookup atom by byte slice
	lookedUp := atom.Lookup([]byte("body"))
	fmt.Printf("Lookup(\"body\") == atom.Body: %t\n", lookedUp == atom.Body)

	// Parse HTML and locate element with atom.Body
	raw := `<!DOCTYPE html><html><head><title>Sample</title></head><body><h1>Content</h1></body></html>`
	doc, err := html.Parse(strings.NewReader(raw))
	if err != nil {
		panic(err)
	}

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

	if bodyNode != nil {
		fmt.Printf("Found body node: DataAtom=%q, Data=%q\n", bodyNode.DataAtom, bodyNode.Data)
	}

	// Construct and render an element using atom.Body
	node := &html.Node{
		Type:     html.ElementNode,
		DataAtom: atom.Body,
		Data:     atom.Body.String(),
	}
	child := &html.Node{
		Type:     html.ElementNode,
		DataAtom: atom.P,
		Data:     atom.P.String(),
	}
	node.AppendChild(child)

	var buf bytes.Buffer
	if err := html.Render(&buf, node); err != nil {
		panic(err)
	}
	fmt.Printf("Rendered HTML:\n%s\n", buf.String())
}

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/net/html/atom.Body in pkg:golang/golang.org/x/net@v0.61.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/net@v0.61.0"
  ],
  "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() {
	// 1. atom.Body is a non-zero Atom representing the HTML body tag with string value "body"
	if atom.Body == 0 {
		fmt.Fprintf(os.Stderr, "Contract 1 failed: atom.Body must be non-zero\n")
		os.Exit(1)
	}
	if atom.Body.String() != "body" {
		fmt.Fprintf(os.Stderr, "Contract 1 failed: atom.Body.String() expected %q, got %q\n", "body", atom.Body.String())
		os.Exit(1)
	}

	// 2. atom.Lookup with byte slice "body" returns atom.Body and lookup with uppercase "BODY" returns 0
	lookupLower := atom.Lookup([]byte("body"))
	if lookupLower != atom.Body {
		fmt.Fprintf(os.Stderr, "Contract 2 failed: atom.Lookup([]byte(\"body\")) expected atom.Body, got %v\n", lookupLower)
		os.Exit(1)
	}
	lookupUpper := atom.Lookup([]byte("BODY"))
	if lookupUpper != 0 {
		fmt.Fprintf(os.Stderr, "Contract 2 failed: atom.Lookup([]byte(\"BODY\")) expected 0, got %v\n", lookupUpper)
		os.Exit(1)
	}

	// 3. atom.String with byte slice "body" returns string "body"
	str := atom.String([]byte("body"))
	if str != "body" {
		fmt.Fprintf(os.Stderr, "Contract 3 failed: atom.String([]byte(\"body\")) expected %q, got %q\n", "body", str)
		os.Exit(1)
	}

	// 4. html.Parse resolves the <body> element node with DataAtom equal to atom.Body and Data equal to "body"
	rawHTML := `<!DOCTYPE html><html><head><title>Contract</title></head><body><div id="content"><p>Test</p></div></body></html>`
	doc, err := html.Parse(strings.NewReader(rawHTML))
	if err != nil {
		fmt.Fprintf(os.Stderr, "Contract 4 failed: html.Parse error: %v\n", err)
		os.Exit(1)
	}

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

	if foundBody == nil {
		fmt.Fprintf(os.Stderr, "Contract 4 failed: <body> element node with atom.Body not found in parsed tree\n")
		os.Exit(1)
	}
	if foundBody.Data != "body" {
		fmt.Fprintf(os.Stderr, "Contract 4 failed: <body> element node Data expected %q, got %q\n", "body", foundBody.Data)
		os.Exit(1)
	}

	// 5. html.Node constructed with DataAtom atom.Body renders as valid HTML body element
	customBody := &html.Node{
		Type:     html.ElementNode,
		DataAtom: atom.Body,
		Data:     atom.Body.String(),
	}
	child := &html.Node{
		Type:     html.ElementNode,
		DataAtom: atom.Span,
		Data:     "span",
	}
	customBody.AppendChild(child)

	var rendered bytes.Buffer
	if err := html.Render(&rendered, customBody); err != nil {
		fmt.Fprintf(os.Stderr, "Contract 5 failed: html.Render error: %v\n", err)
		os.Exit(1)
	}
	expectedHTML := "<body><span></span></body>"
	if rendered.String() != expectedHTML {
		fmt.Fprintf(os.Stderr, "Contract 5 failed: rendered HTML expected %q, got %q\n", expectedHTML, rendered.String())
		os.Exit(1)
	}

	// 6. atom.Body is distinct from other HTML tag atoms including atom.Head, atom.Html, and atom.Div
	if atom.Body == atom.Head || atom.Body == atom.Html || atom.Body == atom.Div {
		fmt.Fprintf(os.Stderr, "Contract 6 failed: atom.Body must be distinct from atom.Head, atom.Html, atom.Div\n")
		os.Exit(1)
	}

	fmt.Println("PASS: all atom.Body contracts satisfied")
}