golang.org/x/text v0.34.0: collate.Collator.Compare

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 collate.Collator.Compare in pkg:golang/golang.org/x/text@v0.34.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/text@v0.34.0
Demonstrate these symbols/APIs:
  - collate.Collator.Compare

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:sha256:47fbdd643092487d908711b202c0b20e4b7e669210eb1720d640bc4d4a5fbc0e","contract":["collate.Collator.Compare returns 0 for equal byte slices, negative when first is less, and positive when first is greater","collate.Collator.Compare respects language-specific collation ordering differences such as Swedish versus German for umlauts","collate.Collator.Compare with collate.IgnoreCase performs case-insensitive comparison of byte slices","collate.Collator.Compare with collate.Numeric orders numeric segments by numeric value rather than character code points","collate.Collator.Compare with collate.Loose ignores case, diacritics, and character width differences"],"goal":"verify collate.Collator.Compare in pkg:golang/golang.org/x/text@v0.34.0","kind":"HOW","packages":["pkg:golang/golang.org/x/text@v0.34.0"],"schemaVersion":1,"symbols":["collate.Collator.Compare"]},"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@v0.34.0"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/text@v0.34.0","symbols":["collate.Collator.Compare"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.26.6

require golang.org/x/text v0.34.0

golang.org/x/text v0.34.0 h1:oL/Qq0Kdaqxa1KbNeMKwQq0reLCCaFtqu2eNuSeNHbk=
golang.org/x/text v0.34.0/go.mod h1:homfLqTYRFyVYemLBFl5GgL/DWEiH5wcsQ5gSh1yziA=

package main

import (
	"fmt"

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

func main() {
	// Standard English collator
	cEng := collate.New(language.English)
	fmt.Printf("Compare apple vs banana: %d\n", cEng.Compare([]byte("apple"), []byte("banana")))

	// Swedish vs German collation difference
	cSv := collate.New(language.Swedish)
	cDe := collate.New(language.German)
	fmt.Printf("Swedish ö vs z: %d\n", cSv.Compare([]byte("ö"), []byte("z")))
	fmt.Printf("German ö vs z: %d\n", cDe.Compare([]byte("ö"), []byte("z")))

	// Options: Case insensitive, numeric, loose
	cIgnore := collate.New(language.English, collate.IgnoreCase)
	fmt.Printf("IgnoreCase apple vs APPLE: %d\n", cIgnore.Compare([]byte("apple"), []byte("APPLE")))

	cNum := collate.New(language.English, collate.Numeric)
	fmt.Printf("Numeric item2 vs item10: %d\n", cNum.Compare([]byte("item2"), []byte("item10")))

	cLoose := collate.New(language.English, collate.Loose)
	fmt.Printf("Loose résumé vs resume: %d\n", cLoose.Compare([]byte("résumé"), []byte("resume")))
}

{
  "schemaVersion": 1,
  "goal": "verify collate.Collator.Compare in pkg:golang/golang.org/x/text@v0.34.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/text@v0.34.0"
  ],
  "symbols": [
    "collate.Collator.Compare"
  ]
}

package main

import (
	"fmt"
	"os"

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

func main() {
	// 1. collate.Collator.Compare returns 0 for equal byte slices, negative when first is less, and positive when first is greater
	cEng := collate.New(language.English)
	if res := cEng.Compare([]byte("alpha"), []byte("alpha")); res != 0 {
		fmt.Fprintf(os.Stderr, "assertion 1 failed: expected 0 for equal slices, got %d\n", res)
		os.Exit(1)
	}
	if res := cEng.Compare([]byte("alpha"), []byte("beta")); res >= 0 {
		fmt.Fprintf(os.Stderr, "assertion 1 failed: expected negative for alpha < beta, got %d\n", res)
		os.Exit(1)
	}
	if res := cEng.Compare([]byte("beta"), []byte("alpha")); res <= 0 {
		fmt.Fprintf(os.Stderr, "assertion 1 failed: expected positive for beta > alpha, got %d\n", res)
		os.Exit(1)
	}
	if res := cEng.Compare([]byte(""), []byte("")); res != 0 {
		fmt.Fprintf(os.Stderr, "assertion 1 failed: expected 0 for empty byte slices, got %d\n", res)
		os.Exit(1)
	}

	// 2. collate.Collator.Compare respects language-specific collation ordering differences such as Swedish versus German for umlauts
	cSv := collate.New(language.Swedish)
	if res := cSv.Compare([]byte("ö"), []byte("z")); res <= 0 {
		fmt.Fprintf(os.Stderr, "assertion 2 failed: expected positive in Swedish (ö > z), got %d\n", res)
		os.Exit(1)
	}
	cDe := collate.New(language.German)
	if res := cDe.Compare([]byte("ö"), []byte("z")); res >= 0 {
		fmt.Fprintf(os.Stderr, "assertion 2 failed: expected negative in German (ö < z), got %d\n", res)
		os.Exit(1)
	}

	// 3. collate.Collator.Compare with collate.IgnoreCase performs case-insensitive comparison of byte slices
	if res := cEng.Compare([]byte("sample"), []byte("SAMPLE")); res == 0 {
		fmt.Fprintf(os.Stderr, "assertion 3 failed: expected non-zero in default case-sensitive collation, got 0\n")
		os.Exit(1)
	}
	cIgnore := collate.New(language.English, collate.IgnoreCase)
	if res := cIgnore.Compare([]byte("sample"), []byte("SAMPLE")); res != 0 {
		fmt.Fprintf(os.Stderr, "assertion 3 failed: expected 0 with IgnoreCase, got %d\n", res)
		os.Exit(1)
	}

	// 4. collate.Collator.Compare with collate.Numeric orders numeric segments by numeric value rather than character code points
	if res := cEng.Compare([]byte("file2.txt"), []byte("file10.txt")); res <= 0 {
		fmt.Fprintf(os.Stderr, "assertion 4 failed: expected positive in default alphabetical collation ('2' > '1'), got %d\n", res)
		os.Exit(1)
	}
	cNum := collate.New(language.English, collate.Numeric)
	if res := cNum.Compare([]byte("file2.txt"), []byte("file10.txt")); res >= 0 {
		fmt.Fprintf(os.Stderr, "assertion 4 failed: expected negative with Numeric option (2 < 10), got %d\n", res)
		os.Exit(1)
	}

	// 5. collate.Collator.Compare with collate.Loose ignores case, diacritics, and character width differences
	cLoose := collate.New(language.English, collate.Loose)
	if res := cLoose.Compare([]byte("résumé"), []byte("RESUME")); res != 0 {
		fmt.Fprintf(os.Stderr, "assertion 5 failed: expected 0 with Loose option for résumé vs RESUME, got %d\n", res)
		os.Exit(1)
	}
	if res := cLoose.Compare([]byte("role"), []byte("rôle")); res != 0 {
		fmt.Fprintf(os.Stderr, "assertion 5 failed: expected 0 with Loose option for role vs rôle, got %d\n", res)
		os.Exit(1)
	}

	fmt.Println("All contract assertions passed.")
}