golang.org/x/net v0.0.0-20191119073136-fc4aabc6c914: html.TokenType

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.TokenType in pkg:golang/golang.org/x/net@v0.0.0-20191119073136-fc4aabc6c914
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/net@v0.0.0-20191119073136-fc4aabc6c914
Demonstrate these symbols/APIs:
  - golang.org/x/net/html.TokenType

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:b655f71538b1dcbeab3b3ca63591e08820c6d7da5d6bb274ed34571054fc850d","contract":["TokenType.String() returns Error, Text, StartTag, EndTag, SelfClosingTag, Comment, and Doctype for the standard token constants","TokenType.String() returns Invalid(N) for out-of-range TokenType values","Tokenizer.Next() and Tokenizer.Token().Type produce matching TokenType values across DOCTYPE, comment, start tag, text, self-closing tag, end tag, and EOF error tokens"],"goal":"verify golang.org/x/net/html.TokenType in pkg:golang/golang.org/x/net@v0.0.0-20191119073136-fc4aabc6c914","kind":"HOW","packages":["pkg:golang/golang.org/x/net@v0.0.0-20191119073136-fc4aabc6c914"],"schemaVersion":1,"symbols":["golang.org/x/net/html.TokenType"]},"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@v0.0.0-20191119073136-fc4aabc6c914"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/net@v0.0.0-20191119073136-fc4aabc6c914","symbols":["golang.org/x/net/html.TokenType"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.21

require golang.org/x/net v0.0.0-20191119073136-fc4aabc6c914

golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/net v0.0.0-20191119073136-fc4aabc6c914 h1:MlY3mEfbnWGmUi4rtHOtNnnnN4UJRGSyLPx+DXA5Sq4=
golang.org/x/net v0.0.0-20191119073136-fc4aabc6c914/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=

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/net/html.TokenType in pkg:golang/golang.org/x/net@v0.0.0-20191119073136-fc4aabc6c914",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/net@v0.0.0-20191119073136-fc4aabc6c914"
  ],
  "symbols": [
    "golang.org/x/net/html.TokenType"
  ]
}

package main

import (
	"fmt"
	"os"
	"strings"

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

func assertEqual(name string, got, want any) {
	if got != want {
		fmt.Fprintf(os.Stderr, "%s: got %v, want %v\n", name, got, want)
		os.Exit(1)
	}
}

func main() {
	// 1. Verify TokenType constants and their String() representations.
	cases := []struct {
		tokenType html.TokenType
		expected  string
	}{
		{html.ErrorToken, "Error"},
		{html.TextToken, "Text"},
		{html.StartTagToken, "StartTag"},
		{html.EndTagToken, "EndTag"},
		{html.SelfClosingTagToken, "SelfClosingTag"},
		{html.CommentToken, "Comment"},
		{html.DoctypeToken, "Doctype"},
		{html.TokenType(99), "Invalid(99)"},
	}

	for _, tc := range cases {
		assertEqual("TokenType.String", tc.tokenType.String(), tc.expected)
	}

	// 2. Verify Tokenizer.Next() returns the expected sequence of html.TokenType values.
	input := `<!DOCTYPE html><!--comment--><div>hello<br/></div>`
	z := html.NewTokenizer(strings.NewReader(input))

	expectedSeq := []html.TokenType{
		html.DoctypeToken,
		html.CommentToken,
		html.StartTagToken,
		html.TextToken,
		html.SelfClosingTagToken,
		html.EndTagToken,
		html.ErrorToken,
	}

	for i, wantType := range expectedSeq {
		gotType := z.Next()
		assertEqual(fmt.Sprintf("step %d Next()", i), gotType, wantType)
		if wantType != html.ErrorToken {
			tok := z.Token()
			assertEqual(fmt.Sprintf("step %d Token().Type", i), tok.Type, wantType)
		}
	}
}