golang.org/x/text v0.3.6: language.High

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/text/language.High in 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
Demonstrate these symbols/APIs:
  - golang.org/x/text/language.High

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:sha256:9491b021df193b8e86a793097487d176681d4446e8668a8abf71e885e4b4f3f5","contract":["language.High is a Confidence constant with integer value 2","language.High is strictly greater than language.Low and strictly less than language.Exact","language.High returns 'High' for its string representation","language.NewMatcher yields language.High confidence when matching tags sharing language and script but differing in region","language.Comprehends yields language.High confidence between regional variants of the same language"],"goal":"verify golang.org/x/text/language.High in pkg:golang/golang.org/x/text@v0.3.6","kind":"HOW","packages":["pkg:golang/golang.org/x/text@v0.3.6"],"schemaVersion":1,"symbols":["golang.org/x/text/language.High"]},"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","symbols":["golang.org/x/text/language.High"],"verifierAdapter":"golang@1"}

module 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 sample

import (
	"golang.org/x/text/language"
)

// HighConfidenceValue returns the language.High constant.
func HighConfidenceValue() language.Confidence {
	return language.High
}

// IsHighConfidence checks whether a given confidence level equals language.High.
func IsHighConfidence(c language.Confidence) bool {
	return c == language.High
}

// IsAtLeastHighConfidence checks whether a given confidence meets or exceeds language.High.
func IsAtLeastHighConfidence(c language.Confidence) bool {
	return c >= language.High
}

// MatchWithThreshold matches user preferred tags against supported tags and returns the matched tag,
// confidence, and a boolean indicating whether the confidence meets or exceeds language.High.
func MatchWithThreshold(supported []language.Tag, userPrefs ...language.Tag) (language.Tag, language.Confidence, bool) {
	matcher := language.NewMatcher(supported)
	tag, _, conf := matcher.Match(userPrefs...)
	return tag, conf, conf >= language.High
}

// CheckMutualComprehension evaluates whether the alternative language has high comprehension for speaker.
func CheckMutualComprehension(speaker, alternative language.Tag) language.Confidence {
	return language.Comprehends(speaker, alternative)
}

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

package main

import (
	"fmt"
	"os"

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

func main() {
	// 1. language.High is a Confidence constant with numerical value 2
	if sample.HighConfidenceValue() != language.High {
		fmt.Fprintf(os.Stderr, "assertion 1 failed: HighConfidenceValue mismatch\n")
		os.Exit(1)
	}
	if int(language.High) != 2 {
		fmt.Fprintf(os.Stderr, "assertion 1 failed: expected language.High == 2, got %d\n", int(language.High))
		os.Exit(1)
	}

	// 2. language.High is strictly greater than language.Low and strictly less than language.Exact
	if !(language.High > language.Low) {
		fmt.Fprintf(os.Stderr, "assertion 2 failed: expected language.High > language.Low\n")
		os.Exit(1)
	}
	if !(language.High < language.Exact) {
		fmt.Fprintf(os.Stderr, "assertion 2 failed: expected language.High < language.Exact\n")
		os.Exit(1)
	}
	if !sample.IsAtLeastHighConfidence(language.High) || !sample.IsAtLeastHighConfidence(language.Exact) {
		fmt.Fprintf(os.Stderr, "assertion 2 failed: IsAtLeastHighConfidence check failed for High or Exact\n")
		os.Exit(1)
	}
	if sample.IsAtLeastHighConfidence(language.Low) || sample.IsAtLeastHighConfidence(language.No) {
		fmt.Fprintf(os.Stderr, "assertion 2 failed: Low or No should not meet High threshold\n")
		os.Exit(1)
	}

	// 3. language.High returns 'High' for its string representation
	if language.High.String() != "High" {
		fmt.Fprintf(os.Stderr, "assertion 3 failed: expected 'High', got %q\n", language.High.String())
		os.Exit(1)
	}

	// 4. language.NewMatcher yields language.High confidence when matching tags sharing language and script but differing in region
	supported := []language.Tag{
		language.AmericanEnglish, // en-US
		language.German,          // de
	}
	tag, conf, ok := sample.MatchWithThreshold(supported, language.BritishEnglish) // en-GB
	if !ok || conf != language.High {
		fmt.Fprintf(os.Stderr, "assertion 4 failed: expected High confidence matching en-GB against en-US, got %v\n", conf)
		os.Exit(1)
	}
	if !sample.IsHighConfidence(conf) {
		fmt.Fprintf(os.Stderr, "assertion 4 failed: IsHighConfidence returned false\n")
		os.Exit(1)
	}
	_ = tag

	// 5. language.Comprehends yields language.High confidence between regional variants of the same language
	compConf := sample.CheckMutualComprehension(language.AmericanEnglish, language.BritishEnglish)
	if compConf != language.High {
		fmt.Fprintf(os.Stderr, "assertion 5 failed: expected language.High for American/British English comprehension, got %v\n", compConf)
		os.Exit(1)
	}

	fmt.Println("PASS: golang.org/x/text/language.High contract verified")
}