golang.org/x/text v0.3.4: 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@v0.3.4
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/text@v0.3.4
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:c129b39d08f335a4aa6d38e351c7905cd2389500508728aee65bf3689d1d0e3f","contract":["language.High is a Confidence constant with integer value 2 and String representation 'High'","language.High is ordered strictly between language.Low and language.Exact (No \u003c Low \u003c High \u003c Exact)","Tag.Script returns the likely script (Latn) with language.High confidence for a base language tag without an explicit script","language.NewMatcher.Match returns language.High confidence when matching a regional variant such as en-GB against supported en-US","language.Comprehends returns language.High confidence between mutually intelligible regional variants of the same language"],"goal":"verify golang.org/x/text/language.High in pkg:golang/golang.org/x/text@v0.3.4","kind":"HOW","packages":["pkg:golang/golang.org/x/text@v0.3.4"],"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@v0.3.4"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/text@v0.3.4","symbols":["golang.org/x/text/language.High"],"verifierAdapter":"golang@1"}

module sample

go 1.21

require golang.org/x/text v0.3.4

golang.org/x/text v0.3.4 h1:0YWbFKbhXG/wIiuHDSKpS0Iy7FSA+u45VtBMfQcFTTc=
golang.org/x/text v0.3.4/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"

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

// MeetsHighConfidence reports whether a confidence level is at least language.High.
func MeetsHighConfidence(c language.Confidence) bool {
	return c >= language.High
}

// MatchTagHigh matches preferred tags against supported tags and checks if the match confidence equals language.High.
func MatchTagHigh(supported []language.Tag, preferred ...language.Tag) (language.Tag, int, language.Confidence, bool) {
	matcher := language.NewMatcher(supported)
	tag, index, conf := matcher.Match(preferred...)
	return tag, index, conf, conf == language.High
}

// InferScriptHigh returns the script and whether its confidence is language.High.
func InferScriptHigh(tag language.Tag) (language.Script, language.Confidence, bool) {
	script, conf := tag.Script()
	return script, conf, conf == language.High
}

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/text/language.High in pkg:golang/golang.org/x/text@v0.3.4",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/text@v0.3.4"
  ],
  "symbols": [
    "golang.org/x/text/language.High"
  ]
}

package main

import (
	"fmt"
	"os"

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

func main() {
	// 1. language.High has integer value 2 and String() == "High"
	if sample.HighConfidence() != language.High || int(language.High) != 2 {
		fmt.Fprintf(os.Stderr, "expected language.High == 2, got %d\n", int(language.High))
		os.Exit(1)
	}
	if language.High.String() != "High" {
		fmt.Fprintf(os.Stderr, "expected language.High.String() == \"High\", got %q\n", language.High.String())
		os.Exit(1)
	}

	// 2. Confidence ordering: language.No < language.Low < language.High < language.Exact
	if !(language.No < language.Low && language.Low < language.High && language.High < language.Exact) {
		fmt.Fprintf(os.Stderr, "unexpected confidence ordering\n")
		os.Exit(1)
	}
	if !sample.MeetsHighConfidence(language.High) || !sample.MeetsHighConfidence(language.Exact) {
		fmt.Fprintf(os.Stderr, "expected High and Exact to meet High confidence threshold\n")
		os.Exit(1)
	}
	if sample.MeetsHighConfidence(language.Low) || sample.MeetsHighConfidence(language.No) {
		fmt.Fprintf(os.Stderr, "expected Low and No not to meet High confidence threshold\n")
		os.Exit(1)
	}

	// 3. Tag.Script() returns language.High confidence when inferring script from base language
	script, scriptConf, isHigh := sample.InferScriptHigh(language.English)
	if !isHigh || scriptConf != language.High || script.String() != "Latn" {
		fmt.Fprintf(os.Stderr, "expected Latn with High confidence for English, got %v (%v)\n", script, scriptConf)
		os.Exit(1)
	}

	// 4. language.NewMatcher.Match returns language.High when matching regional variants of the same language
	supported := []language.Tag{language.AmericanEnglish, language.German}
	_, idx, matchConf, matchedHigh := sample.MatchTagHigh(supported, language.BritishEnglish)
	if !matchedHigh || matchConf != language.High || idx != 0 {
		fmt.Fprintf(os.Stderr, "expected High confidence at index 0 matching en-GB to en-US, got idx=%d conf=%v\n", idx, matchConf)
		os.Exit(1)
	}

	// 5. language.Comprehends returns language.High between mutually intelligible regional variants
	comp := language.Comprehends(language.AmericanEnglish, language.BritishEnglish)
	if comp != language.High {
		fmt.Fprintf(os.Stderr, "expected language.Comprehends(en-US, en-GB) == High, got %v\n", comp)
		os.Exit(1)
	}

	fmt.Println("contract ok")
}