golang.org/x/net v0.41.0: html.RawNode

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.RawNode in pkg:golang/golang.org/x/net@v0.41.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/net@v0.41.0
Demonstrate these symbols/APIs:
  - golang.org/x/net/html.RawNode

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:sha256:2cc37f296f14fd5736b3fcff65577d3187ba290df9128f4adaa04df16f12d5d6","contract":["html.RawNode is a NodeType enum constant equal to 6 and distinct from TextNode and ElementNode","html.Render writes html.RawNode Data directly to the output stream without HTML escaping while escaping html.TextNode siblings","html.RawNode with empty Data serializes as an empty string without error","html.Parse does not produce html.RawNode nodes and a RawNode appended into a parsed document tree renders its raw markup in place"],"goal":"verify golang.org/x/net/html.RawNode in pkg:golang/golang.org/x/net@v0.41.0","kind":"HOW","packages":["pkg:golang/golang.org/x/net@v0.41.0"],"schemaVersion":1,"symbols":["golang.org/x/net/html.RawNode"]},"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@v0.41.0"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/net@v0.41.0","symbols":["golang.org/x/net/html.RawNode"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.23.0

require golang.org/x/net v0.41.0

golang.org/x/net v0.41.0 h1:vBTly1HeNPEn3wtREYfy4GZ/NECgw2Cnl+nK6Nz3uvw=
golang.org/x/net v0.41.0/go.mod h1:B/K4NNqkfmg07DQYrbwvSluqCJOOXwUjeb/5lOisjbA=

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/net/html.RawNode in pkg:golang/golang.org/x/net@v0.41.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/net@v0.41.0"
  ],
  "symbols": [
    "golang.org/x/net/html.RawNode"
  ]
}

package main

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

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

func fail(msg string) {
	fmt.Fprintln(os.Stderr, msg)
	os.Exit(1)
}

func main() {
	// 1. Verify html.RawNode is a distinct NodeType constant equal to 6.
	var nt html.NodeType = html.RawNode
	if nt != 6 {
		fail(fmt.Sprintf("expected html.RawNode to equal 6, got %d", nt))
	}
	if html.RawNode == html.TextNode || html.RawNode == html.ElementNode {
		fail("expected html.RawNode to differ from TextNode and ElementNode")
	}

	// 2. Verify html.Render writes html.RawNode Data verbatim without HTML escaping,
	// whereas html.TextNode escapes special HTML characters.
	container := &html.Node{
		Type:     html.ElementNode,
		DataAtom: atom.Div,
		Data:     "div",
	}
	container.AppendChild(&html.Node{
		Type: html.TextNode,
		Data: "<b>escaped</b>",
	})
	container.AppendChild(&html.Node{
		Type: html.RawNode,
		Data: "<i>unescaped &amp; raw</i>",
	})

	var buf bytes.Buffer
	if err := html.Render(&buf, container); err != nil {
		fail(fmt.Sprintf("html.Render failed: %v", err))
	}
	rendered := buf.String()
	expected := "<div>&lt;b&gt;escaped&lt;/b&gt;<i>unescaped &amp; raw</i></div>"
	if rendered != expected {
		fail(fmt.Sprintf("unexpected render output: got %q, want %q", rendered, expected))
	}

	// 3. Verify html.RawNode with empty Data renders as empty string without error.
	emptyRaw := &html.Node{
		Type: html.RawNode,
		Data: "",
	}
	buf.Reset()
	if err := html.Render(&buf, emptyRaw); err != nil {
		fail(fmt.Sprintf("html.Render on empty RawNode failed: %v", err))
	}
	if buf.String() != "" {
		fail(fmt.Sprintf("expected empty output for empty RawNode, got %q", buf.String()))
	}

	// 4. Verify html.Parse does not produce html.RawNode nodes, and a RawNode
	// appended into a parsed document tree renders its raw markup in place.
	doc, err := html.Parse(strings.NewReader("<html><head></head><body><p>hello</p></body></html>"))
	if err != nil {
		fail(fmt.Sprintf("html.Parse failed: %v", err))
	}
	var walk func(*html.Node) *html.Node
	var body *html.Node
	walk = func(n *html.Node) *html.Node {
		if n.Type == html.RawNode {
			fail("html.Parse should not produce html.RawNode")
		}
		if n.Type == html.ElementNode && n.Data == "body" {
			body = n
		}
		for c := n.FirstChild; c != nil; c = c.NextSibling {
			walk(c)
		}
		return body
	}
	walk(doc)
	if body == nil {
		fail("body element not found in parsed document")
	}
	body.AppendChild(&html.Node{
		Type: html.RawNode,
		Data: `<span data-kind="raw">injected</span>`,
	})
	buf.Reset()
	if err := html.Render(&buf, doc); err != nil {
		fail(fmt.Sprintf("html.Render on modified document failed: %v", err))
	}
	if !strings.Contains(buf.String(), `<p>hello</p><span data-kind="raw">injected</span>`) {
		fail(fmt.Sprintf("modified document missing raw node output: %q", buf.String()))
	}
}