golang.org/x/text v0.3.8: language.Confidence

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.Confidence in pkg:golang/golang.org/x/text@v0.3.8
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/text@v0.3.8
Demonstrate these symbols/APIs:
  - golang.org/x/text/language.Confidence

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:sha256:92415e4a648db8078e52a30004fa998ed50ac5a5bec31ba3c9bb1a3565dade65","contract":["language.Confidence constants are ordered language.No \u003c language.Low \u003c language.High \u003c language.Exact","language.Confidence.String() returns \"No\", \"Low\", \"High\", and \"Exact\" for the respective constants","language.Make(\"en-US\").Base() and Region() return language.Exact confidence, while inferred Script() returns language.High confidence","language.NewMatcher([]language.Tag{language.English, language.French}).Match(language.English) returns language.Exact confidence, and an unmatched tag returns language.No confidence"],"goal":"verify golang.org/x/text/language.Confidence in pkg:golang/golang.org/x/text@v0.3.8","kind":"HOW","packages":["pkg:golang/golang.org/x/text@v0.3.8"],"schemaVersion":1,"symbols":["golang.org/x/text/language.Confidence"]},"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@v0.3.8"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/text@v0.3.8","symbols":["golang.org/x/text/language.Confidence"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.21

require golang.org/x/text v0.3.8

golang.org/x/text v0.3.8 h1:nAL+RVCQ9uMn3vJZbV+MRnydTJFPf8qqY42YiA6MrqY=
golang.org/x/text v0.3.8/go.mod h1:E6s5w1FMmriuDzIBO73fBruAKo1PCIq6d2Q6DHfQ8WQ=

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/text/language.Confidence in pkg:golang/golang.org/x/text@v0.3.8",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/text@v0.3.8"
  ],
  "symbols": [
    "golang.org/x/text/language.Confidence"
  ]
}

package main

import (
	"fmt"
	"os"

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

func assert(cond bool, msg string) {
	if !cond {
		fmt.Fprintln(os.Stderr, "assertion failed:", msg)
		os.Exit(1)
	}
}

func main() {
	// Verify Confidence constants ordering and String() representation
	var no language.Confidence = language.No
	var low language.Confidence = language.Low
	var high language.Confidence = language.High
	var exact language.Confidence = language.Exact

	assert(no < low && low < high && high < exact, "Confidence ordering No < Low < High < Exact")
	assert(no.String() == "No", "No.String() == No")
	assert(low.String() == "Low", "Low.String() == Low")
	assert(high.String() == "High", "High.String() == High")
	assert(exact.String() == "Exact", "Exact.String() == Exact")

	// Verify Confidence returned by Tag component extraction and Matcher.Match
	tag := language.Make("en-US")
	base, baseConf := tag.Base()
	assert(base.String() == "en" && baseConf == language.Exact, "en-US Base confidence is Exact")

	region, regionConf := tag.Region()
	assert(region.String() == "US" && regionConf == language.Exact, "en-US Region confidence is Exact")

	script, scriptConf := tag.Script()
	assert(script.String() == "Latn" && scriptConf == language.High, "en-US inferred Script Latn confidence is High")

	matcher := language.NewMatcher([]language.Tag{
		language.English,
		language.French,
	})
	_, idx, matchConf := matcher.Match(language.English)
	assert(idx == 0 && matchConf == language.Exact, "Exact language match returns Exact confidence")

	_, _, noMatchConf := matcher.Match(language.Japanese)
	assert(noMatchConf == language.No, "Unmatched language fallback returns No confidence")
}