golang.org/x/text v0.3.2

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 pkg:golang/golang.org/x/text@v0.3.2
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/text@v0.3.2

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:b644e1933c03127d68d1f65930e3483e80b0c8e601b383211799e08374303eae","contract":["currency.ParseISO parses standard 3-letter ISO 4217 currency codes into Unit values and rejects invalid or malformed codes","currency.MustParseISO safely initializes known Unit values and panics on invalid input","currency.FromTag resolves regional default currency units and respects unicode currency extensions","currency.Standard reports decimal scale and rounding increments for standard and non-fractional currencies","currency.Unit Amount formats currency values using ISO code, Symbol and NarrowSymbol formatters"],"goal":"verify pkg:golang/golang.org/x/text@v0.3.2","kind":"HOW","packages":["pkg:golang/golang.org/x/text@v0.3.2"],"schemaVersion":1},"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@v0.3.2"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/text@v0.3.2","verifierAdapter":"golang@1"}

module example.com/sample

go 1.22

require golang.org/x/text v0.3.2

golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=

package main

import (
	"fmt"
	"os"

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

func main() {
	// Parse ISO currency codes
	usd, err := currency.ParseISO("USD")
	if err != nil {
		fmt.Fprintf(os.Stderr, "failed to parse USD: %v\n", err)
		os.Exit(1)
	}
	fmt.Printf("Parsed ISO: %s\n", usd)

	// Safe initialization via MustParseISO
	gbp := currency.MustParseISO("GBP")
	fmt.Printf("MustParsed ISO: %s\n", gbp)

	// Resolve regional currency from language tags
	tagUS := language.MustParse("en-US")
	curUS, _ := currency.FromTag(tagUS)
	fmt.Printf("Currency for %s: %s\n", tagUS, curUS)

	// Handle BCP 47 currency extension (-u-cu-)
	tagEUR := language.MustParse("en-US-u-cu-eur")
	curEUR, conf := currency.FromTag(tagEUR)
	fmt.Printf("Currency for %s: %s (confidence: %v)\n", tagEUR, curEUR, conf)

	// Inspect currency decimal scale and rounding
	scaleUSD, incUSD := currency.Standard.Rounding(usd)
	fmt.Printf("USD rounding: scale=%d, increment=%d\n", scaleUSD, incUSD)

	scaleJPY, incJPY := currency.Standard.Rounding(currency.JPY)
	fmt.Printf("JPY rounding: scale=%d, increment=%d\n", scaleJPY, incJPY)

	// Create and format currency amounts
	amt := usd.Amount(12.50)
	fmt.Printf("Amount ISO formatting: %v\n", currency.ISO(amt))
	fmt.Printf("Amount Symbol formatting: %v\n", currency.Symbol(amt))
	fmt.Printf("Amount NarrowSymbol formatting: %v\n", currency.NarrowSymbol(amt))

	jpyAmt := currency.JPY.Amount(float64(1500))
	fmt.Printf("JPY ISO formatting: %v\n", currency.ISO(jpyAmt))
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:golang/golang.org/x/text@v0.3.2",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/text@v0.3.2"
  ]
}

package main

import (
	"fmt"
	"os"

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

func main() {
	// Assertion 1: currency.ParseISO parses standard 3-letter ISO 4217 currency codes into Unit values and rejects invalid or malformed codes
	usd, err := currency.ParseISO("USD")
	if err != nil || usd != currency.USD {
		fmt.Fprintf(os.Stderr, "FAIL assertion 1: expected USD, got %v, err=%v\n", usd, err)
		os.Exit(1)
	}

	eur, err := currency.ParseISO("eur")
	if err != nil || eur != currency.EUR {
		fmt.Fprintf(os.Stderr, "FAIL assertion 1: expected lowercase 'eur' to resolve to EUR, got %v, err=%v\n", eur, err)
		os.Exit(1)
	}

	if _, err := currency.ParseISO("INVALID"); err == nil {
		fmt.Fprintf(os.Stderr, "FAIL assertion 1: expected error for malformed code 'INVALID', got nil\n")
		os.Exit(1)
	}

	if _, err := currency.ParseISO("ZZZ"); err == nil {
		fmt.Fprintf(os.Stderr, "FAIL assertion 1: expected error for unrecognized code 'ZZZ', got nil\n")
		os.Exit(1)
	}

	// Assertion 2: currency.MustParseISO safely initializes known Unit values and panics on invalid input
	gbp := currency.MustParseISO("GBP")
	if gbp != currency.GBP {
		fmt.Fprintf(os.Stderr, "FAIL assertion 2: expected GBP, got %v\n", gbp)
		os.Exit(1)
	}

	panicked := false
	func() {
		defer func() {
			if r := recover(); r != nil {
				panicked = true
			}
		}()
		currency.MustParseISO("NOT_A_CURRENCY")
	}()
	if !panicked {
		fmt.Fprintf(os.Stderr, "FAIL assertion 2: expected MustParseISO to panic on invalid code\n")
		os.Exit(1)
	}

	// Assertion 3: currency.FromTag resolves regional default currency units and respects unicode currency extensions
	uUS, _ := currency.FromTag(language.MustParse("en-US"))
	if uUS != currency.USD {
		fmt.Fprintf(os.Stderr, "FAIL assertion 3: expected en-US -> USD, got %v\n", uUS)
		os.Exit(1)
	}

	uJP, _ := currency.FromTag(language.MustParse("ja-JP"))
	if uJP != currency.JPY {
		fmt.Fprintf(os.Stderr, "FAIL assertion 3: expected ja-JP -> JPY, got %v\n", uJP)
		os.Exit(1)
	}

	uExt, confExt := currency.FromTag(language.MustParse("en-US-u-cu-eur"))
	if uExt != currency.EUR || confExt != language.Exact {
		fmt.Fprintf(os.Stderr, "FAIL assertion 3: expected en-US-u-cu-eur -> EUR with Exact, got %v (%v)\n", uExt, confExt)
		os.Exit(1)
	}

	// Assertion 4: currency.Standard reports decimal scale and rounding increments for standard and non-fractional currencies
	scaleUSD, incUSD := currency.Standard.Rounding(currency.USD)
	if scaleUSD != 2 || incUSD != 1 {
		fmt.Fprintf(os.Stderr, "FAIL assertion 4: expected USD scale 2 inc 1, got scale %d inc %d\n", scaleUSD, incUSD)
		os.Exit(1)
	}

	scaleJPY, incJPY := currency.Standard.Rounding(currency.JPY)
	if scaleJPY != 0 || incJPY != 1 {
		fmt.Fprintf(os.Stderr, "FAIL assertion 4: expected JPY scale 0 inc 1, got scale %d inc %d\n", scaleJPY, incJPY)
		os.Exit(1)
	}

	// Assertion 5: currency.Unit Amount formats currency values using ISO code, Symbol and NarrowSymbol formatters
	amt := currency.USD.Amount(12.5)
	if amt.Currency() != currency.USD {
		fmt.Fprintf(os.Stderr, "FAIL assertion 5: expected Amount currency USD, got %v\n", amt.Currency())
		os.Exit(1)
	}

	isoFormatted := fmt.Sprint(currency.ISO(amt))
	if isoFormatted != "USD 12.50" {
		fmt.Fprintf(os.Stderr, "FAIL assertion 5: expected 'USD 12.50', got '%s'\n", isoFormatted)
		os.Exit(1)
	}

	narrowFormatted := fmt.Sprint(currency.NarrowSymbol(amt))
	if narrowFormatted != "$ 12.50" {
		fmt.Fprintf(os.Stderr, "FAIL assertion 5: expected '$ 12.50', got '%s'\n", narrowFormatted)
		os.Exit(1)
	}

	symbolFormatted := fmt.Sprint(currency.Symbol(amt))
	if symbolFormatted != "US$ 12.50" {
		fmt.Fprintf(os.Stderr, "FAIL assertion 5: expected 'US$ 12.50', got '%s'\n", symbolFormatted)
		os.Exit(1)
	}

	jpyAmt := currency.JPY.Amount(float64(1500))
	jpyIsoFormatted := fmt.Sprint(currency.ISO(jpyAmt))
	if jpyIsoFormatted != "JPY 1500" {
		fmt.Fprintf(os.Stderr, "FAIL assertion 5: expected 'JPY 1500', got '%s'\n", jpyIsoFormatted)
		os.Exit(1)
	}

	fmt.Println("Contract passed: all assertions verified successfully.")
}