//go:build ignore

// Prints GO_PRINTABLE_RANGES of src/lib/dkc/bytes.ts: the runes above U+007F
// that strconv.IsPrint accepts, as pairs of (gap from the end of the previous
// range, length) in base 36 from U+0080, and the SHA-256 of the IsPrint bit
// set of all runes (bit r at byte r>>3, mask 1<<(r&7)) that bytes.test.ts
// pins. Run it with the Go toolchain of the reference implementation:
//
//	go run scripts/go-isprint-table.go
package main

import (
	"crypto/sha256"
	"fmt"
	"runtime"
	"strconv"
	"strings"
	"unicode"
)

func main() {
	var parts []string
	next, lo, ranges, runes := rune(0x80), rune(-1), 0, 0
	flush := func(hi rune) {
		parts = append(parts, strconv.FormatInt(int64(lo-next), 36), strconv.FormatInt(int64(hi-lo+1), 36))
		next, lo = hi+1, -1
		ranges++
	}
	for r := rune(0x80); r <= unicode.MaxRune; r++ {
		if strconv.IsPrint(r) {
			runes++
			if lo < 0 {
				lo = r
			}
		} else if lo >= 0 {
			flush(r - 1)
		}
	}
	if lo >= 0 {
		flush(unicode.MaxRune)
	}
	bits := make([]byte, (unicode.MaxRune+1)/8)
	for r := rune(0); r <= unicode.MaxRune; r++ {
		if strconv.IsPrint(r) {
			bits[r>>3] |= 1 << (r & 7)
		}
	}
	fmt.Printf("// %s, Unicode %s: %d ranges, %d runes, bit set SHA-256 %x\n", runtime.Version(), unicode.Version, ranges, runes, sha256.Sum256(bits))
	fmt.Println(strings.Join(parts, ","))
}