golang.org/x/text v0.3.6

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/text@v0.3.6
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/text@v0.3.6

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:fabbe8359c6273ca398f3cd2f752cb9991becaae5799b1027c53cfb3e45264ef","contract":["cases.Title converts strings and byte slices to title case according to language rules","cases.NoLower preserves existing uppercase in non-initial positions","cases.Title handles language-specific title casing for Turkish dotted I and Dutch IJ","cases.Fold folds strings to lowercase equivalents for caseless matching"],"goal":"verify pkg:golang/golang.org/x/text@v0.3.6","kind":"HOW","packages":["pkg:golang/golang.org/x/text@v0.3.6"],"schemaVersion":1},"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/text@v0.3.6"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/text@v0.3.6","verifierAdapter":"golang@1"}

module example.com/sample

go 1.26.6

require golang.org/x/text v0.3.6

golang.org/x/text v0.3.6 h1:aRYxNxv6iGQlyVaZmk6ZgYEDa+Jg18DxebPSrd6bg1M=
golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=

package main

import (
	"fmt"

	"golang.org/x/text/cases"
	"golang.org/x/text/language"
)

func main() {
	enTitle := cases.Title(language.English)
	fmt.Println(enTitle.String("hello world"))

	trTitle := cases.Title(language.Turkish)
	fmt.Println(trTitle.String("istanbul"))

	folder := cases.Fold()
	fmt.Println(folder.String("Straße"))
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:golang/golang.org/x/text@v0.3.6",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/text@v0.3.6"
  ]
}

package main

import (
	"bytes"
	"fmt"
	"os"

	"golang.org/x/text/cases"
	"golang.org/x/text/language"
)

func main() {
	// 1. cases.Title converts strings and byte slices to title case according to language rules
	undCaser := cases.Title(language.Und)
	if got := undCaser.String("hello world"); got != "Hello World" {
		fmt.Fprintf(os.Stderr, "FAIL: expected 'Hello World', got %q\n", got)
		os.Exit(1)
	}
	if got := undCaser.String("HELLO WORLD"); got != "Hello World" {
		fmt.Fprintf(os.Stderr, "FAIL: expected 'Hello World', got %q\n", got)
		os.Exit(1)
	}

	inputBytes := []byte("data stream")
	expectedBytes := []byte("Data Stream")
	if got := undCaser.Bytes(inputBytes); !bytes.Equal(got, expectedBytes) {
		fmt.Fprintf(os.Stderr, "FAIL: expected %q, got %q\n", expectedBytes, got)
		os.Exit(1)
	}

	// 2. cases.NoLower preserves existing uppercase in non-initial positions
	noLowerCaser := cases.Title(language.Und, cases.NoLower)
	if got := noLowerCaser.String("hELLO wORLD"); got != "HELLO WORLD" {
		fmt.Fprintf(os.Stderr, "FAIL: expected 'HELLO WORLD', got %q\n", got)
		os.Exit(1)
	}

	// 3. cases.Title handles language-specific title casing for Turkish dotted I and Dutch IJ
	trCaser := cases.Title(language.Turkish)
	if got := trCaser.String("istanbul"); got != "İstanbul" {
		fmt.Fprintf(os.Stderr, "FAIL: Turkish 'istanbul' expected 'İstanbul', got %q\n", got)
		os.Exit(1)
	}
	if got := trCaser.String("ılık"); got != "Ilık" {
		fmt.Fprintf(os.Stderr, "FAIL: Turkish 'ılık' expected 'Ilık', got %q\n", got)
		os.Exit(1)
	}

	nlCaser := cases.Title(language.Dutch)
	if got := nlCaser.String("ijsland"); got != "IJsland" {
		fmt.Fprintf(os.Stderr, "FAIL: Dutch 'ijsland' expected 'IJsland', got %q\n", got)
		os.Exit(1)
	}

	// 4. cases.Fold folds strings to lowercase equivalents for caseless matching
	folder := cases.Fold()
	if got := folder.String("Straße"); got != "strasse" {
		fmt.Fprintf(os.Stderr, "FAIL: German 'Straße' expected 'strasse', got %q\n", got)
		os.Exit(1)
	}
	if got := folder.String("MICROSOFT"); got != "microsoft" {
		fmt.Fprintf(os.Stderr, "FAIL: 'MICROSOFT' expected 'microsoft', got %q\n", got)
		os.Exit(1)
	}

	fmt.Println("PASS: golang.org/x/text contract passed")
}