golang.org/x/net v0.10.0

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 pkg:golang/golang.org/x/net@v0.10.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/net@v0.10.0
Required runtime conditions:
  - ecosystem: golang
  - language: go
  - packageManager: go@1.26.6
  - runtime: go@1.26.6

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:sha256:672f0315440ad6ede2b9d595ae919a80b88ffceccb939a8c291ed0c0353d0dff","contract":["html.Parse parses valid HTML and returns document root node","atom.Lookup correctly resolves known HTML tag atoms","html.Render serializes parsed and constructed HTML node trees","atom.String returns corresponding string tag names"],"goal":"verify pkg:golang/golang.org/x/net@v0.10.0","kind":"HOW","packages":["pkg:golang/golang.org/x/net@v0.10.0"],"schemaVersion":1},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","language":"go","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","packageManagerVersion":"1.26.6","runtime":"go","runtimeVersion":"1.26.6","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/golang.org/x/net@v0.10.0"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/net@v0.10.0","verifierAdapter":"golang@1"}

module example.com/sample

go 1.20

require golang.org/x/net v0.10.0

golang.org/x/net v0.10.0 h1:X2//UzNDwYmtCLn7To6G58Wr6f5ahEAQgKNzv9Y951M=
golang.org/x/net v0.10.0/go.mod h1:0qNGK6F8kojg2nk9dLZ2mShWaEBan6FAoqfSigmmuDg=

package main

import (
	"bytes"
	"fmt"
	"strings"

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

func main() {
	raw := `<!DOCTYPE html><html><head><title>Sample</title></head><body><h1>Hello</h1><p>Test</p></body></html>`
	doc, err := html.Parse(strings.NewReader(raw))
	if err != nil {
		panic(err)
	}

	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; c = c.NextSibling {
			walk(c)
			if bodyNode != nil {
				return
			}
		}
	}
	walk(doc)

	if bodyNode != nil {
		fmt.Printf("Parsed body node with atom: %s\n", bodyNode.DataAtom.String())
	}

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

{
  "schemaVersion": 1,
  "goal": "verify pkg:golang/golang.org/x/net@v0.10.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/net@v0.10.0"
  ],
  "runtimeConditions": {
    "ecosystem": "golang",
    "language": "go",
    "packageManager": "go@1.26.6",
    "runtime": "go@1.26.6"
  }
}

package main

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

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

func main() {
	// 1. html.Parse parses valid HTML and returns document root node
	raw := `<!DOCTYPE html><html><head><title>Test</title></head><body><p id="msg">Hello World</p></body></html>`
	doc, err := html.Parse(strings.NewReader(raw))
	if err != nil {
		fmt.Fprintf(os.Stderr, "Contract 1 failed: html.Parse error: %v\n", err)
		os.Exit(1)
	}
	if doc == nil || doc.Type != html.DocumentNode {
		fmt.Fprintf(os.Stderr, "Contract 1 failed: expected DocumentNode root\n")
		os.Exit(1)
	}

	// 2. atom.Lookup correctly resolves known HTML tag atoms
	lookupBody := atom.Lookup([]byte("body"))
	if lookupBody != atom.Body {
		fmt.Fprintf(os.Stderr, "Contract 2 failed: atom.Lookup(\"body\") expected atom.Body, got %v\n", lookupBody)
		os.Exit(1)
	}
	lookupUnknown := atom.Lookup([]byte("nonexistentatomtag"))
	if lookupUnknown != 0 {
		fmt.Fprintf(os.Stderr, "Contract 2 failed: expected 0 for unknown atom, got %v\n", lookupUnknown)
		os.Exit(1)
	}

	// 3. html.Render serializes parsed and constructed HTML node trees
	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; c = c.NextSibling {
			walk(c)
			if bodyNode != nil {
				return
			}
		}
	}
	walk(doc)
	if bodyNode == nil {
		fmt.Fprintf(os.Stderr, "Contract 3 failed: body node not found\n")
		os.Exit(1)
	}

	var buf bytes.Buffer
	if err := html.Render(&buf, bodyNode); err != nil {
		fmt.Fprintf(os.Stderr, "Contract 3 failed: html.Render error: %v\n", err)
		os.Exit(1)
	}
	expected := "<body><p id=\"msg\">Hello World</p></body>"
	if buf.String() != expected {
		fmt.Fprintf(os.Stderr, "Contract 3 failed: expected %q, got %q\n", expected, buf.String())
		os.Exit(1)
	}

	// 4. atom.String returns corresponding string tag names
	if atom.Body.String() != "body" {
		fmt.Fprintf(os.Stderr, "Contract 4 failed: atom.Body.String() expected \"body\", got %q\n", atom.Body.String())
		os.Exit(1)
	}
	if atom.P.String() != "p" {
		fmt.Fprintf(os.Stderr, "Contract 4 failed: atom.P.String() expected \"p\", got %q\n", atom.P.String())
		os.Exit(1)
	}

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