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

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.Low 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.Low

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:d70cbcf40da9b344926a9f349821e9be4f009c67d376669a05384c48fab17890","contract":["language.Low is a Confidence level representing 1 with string value \"Low\"","language.Low is greater than language.No and less than language.High","Tag.Script returns Cyrl with language.Low confidence for language tag sr","Tag.Base returns en with language.Low confidence for undetermined tag und","Tag.Region returns US with language.Low confidence for language tag en","Matcher.Match returns language.Low confidence when matching TraditionalChinese against SimplifiedChinese"],"goal":"verify golang.org/x/text/language.Low 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.Low"]},"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.Low"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.23

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/language"
)

func main() {
	// language.Low is a Confidence level indicating the most likely value
	// picked out of a set of alternatives when confidence is not high or exact.
	fmt.Printf("Confidence Low value: %d, string: %s\n", int(language.Low), language.Low)

	// Inferred script for Serbian ("sr"): Cyrillic is returned with Low confidence
	// because both Cyrillic and Latin scripts are commonly used.
	sr := language.MustParse("sr")
	script, conf := sr.Script()
	fmt.Printf("Language 'sr' script: %s, confidence: %s (is Low: %t)\n", script, conf, conf == language.Low)

	// Undetermined base language tag: infers English with Low confidence.
	und := language.MustParse("und")
	base, baseConf := und.Base()
	fmt.Printf("Language 'und' base: %s, confidence: %s (is Low: %t)\n", base, baseConf, baseConf == language.Low)

	// Inferred region for English without explicit region: returns US with Low confidence.
	en := language.MustParse("en")
	region, regConf := en.Region()
	fmt.Printf("Language 'en' region: %s, confidence: %s (is Low: %t)\n", region, regConf, regConf == language.Low)

	// Matcher fallback: matching Traditional Chinese against a matcher supporting Simplified Chinese
	matcher := language.NewMatcher([]language.Tag{language.SimplifiedChinese, language.English})
	matchedTag, _, matchConf := matcher.Match(language.TraditionalChinese)
	fmt.Printf("Matched tag: %s, confidence: %s (is Low: %t)\n", matchedTag, matchConf, matchConf == language.Low)
}

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/text/language.Low 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.Low"
  ]
}

package main

import (
	"fmt"
	"os"

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

func main() {
	// 1. language.Low is a Confidence level representing 1 with string value "Low"
	if int(language.Low) != 1 {
		fmt.Fprintf(os.Stderr, "assertion 1 failed: expected integer 1, got %d\n", int(language.Low))
		os.Exit(1)
	}
	if language.Low.String() != "Low" {
		fmt.Fprintf(os.Stderr, "assertion 1 failed: expected string 'Low', got %s\n", language.Low.String())
		os.Exit(1)
	}

	// 2. language.Low is greater than language.No and less than language.High
	if !(language.Low > language.No && language.Low < language.High) {
		fmt.Fprintf(os.Stderr, "assertion 2 failed: confidence ordering incorrect\n")
		os.Exit(1)
	}

	// 3. Tag.Script returns Cyrl with language.Low confidence for language tag sr
	srTag := language.MustParse("sr")
	script, scriptConf := srTag.Script()
	if script.String() != "Cyrl" || scriptConf != language.Low {
		fmt.Fprintf(os.Stderr, "assertion 3 failed: expected Cyrl with Low, got %s with %s\n", script, scriptConf)
		os.Exit(1)
	}

	// 4. Tag.Base returns en with language.Low confidence for undetermined tag und
	undTag := language.MustParse("und")
	base, baseConf := undTag.Base()
	if base.String() != "en" || baseConf != language.Low {
		fmt.Fprintf(os.Stderr, "assertion 4 failed: expected en with Low, got %s with %s\n", base, baseConf)
		os.Exit(1)
	}

	// 5. Tag.Region returns US with language.Low confidence for language tag en
	enTag := language.MustParse("en")
	region, regionConf := enTag.Region()
	if region.String() != "US" || regionConf != language.Low {
		fmt.Fprintf(os.Stderr, "assertion 5 failed: expected US with Low, got %s with %s\n", region, regionConf)
		os.Exit(1)
	}

	// 6. Matcher.Match returns language.Low confidence when matching TraditionalChinese against SimplifiedChinese
	matcher := language.NewMatcher([]language.Tag{language.SimplifiedChinese, language.English})
	matchedTag, _, matchConf := matcher.Match(language.TraditionalChinese)
	if matchedTag != language.SimplifiedChinese || matchConf != language.Low {
		fmt.Fprintf(os.Stderr, "assertion 6 failed: expected SimplifiedChinese with Low, got %s with %s\n", matchedTag, matchConf)
		os.Exit(1)
	}

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