99 lines
2.1 KiB
Go
99 lines
2.1 KiB
Go
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package main
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import (
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"bufio"
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"bytes"
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_ "embed"
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"flag"
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"fmt"
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"os"
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"strconv"
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"strings"
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)
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//go:embed UnicodeData.txt
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var unicodedata []byte
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func die(msg string) {
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fmt.Fprintln(os.Stderr, msg)
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fmt.Fprintln(os.Stderr, "USAGE:", os.Args[0], "[-ranges RANGES]")
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flag.PrintDefaults()
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os.Exit(-1)
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}
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type rangeInterval struct {
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from int64
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to int64
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}
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func (r *rangeInterval) contains(i int64) bool {
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return r.from <= i && i <= r.to
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}
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func parseHex(s string) (int64, error) {
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return strconv.ParseInt(s, 16, 32)
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}
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func parseRanges(ranges string) []rangeInterval {
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intervals := []rangeInterval{}
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if strings.TrimSpace(ranges) != "" {
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splitranges := strings.Split(ranges, " ")
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for _, r := range splitranges {
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fromto := strings.Split(r, "..")
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if len(fromto) != 2 {
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die("invalid ranges")
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}
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from, err := parseHex(fromto[0])
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if err != nil {
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die("invalid ranges")
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}
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to, err := parseHex(fromto[1])
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if err != nil {
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die("invalid ranges")
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}
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intervals = append(intervals, rangeInterval{from, to})
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}
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}
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return intervals
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}
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func printCodepoint(i int64, description string) {
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var ch rune = rune(i)
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var s string = string([]rune{ch})
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fmt.Println(s, description)
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}
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func main() {
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var ranges string
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flag.StringVar(&ranges, "ranges", "", "define multiple codepoint ranges with \"N1..N2 N3..N4\"")
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flag.Parse()
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rangeIntervals := parseRanges(ranges)
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scanner := bufio.NewScanner(bytes.NewReader(unicodedata))
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for scanner.Scan() {
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line := scanner.Text()
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splitline := strings.Split(line, ";")
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if len(splitline) < 2 || len(splitline[1]) == 0 {
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continue
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}
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codepoint, description := splitline[0], splitline[1]
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if (description[0] == '<' && description[len(description)-1] == '>') || strings.Contains(description, "MODIFIER") || strings.Contains(description, "VARIATION SELECTOR") {
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continue
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}
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i, err := parseHex(codepoint)
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if err != nil {
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continue
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}
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if len(rangeIntervals) == 0 {
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printCodepoint(i, description)
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}
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for _, r := range rangeIntervals {
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if r.contains(i) {
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printCodepoint(i, description)
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break
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}
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}
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}
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}
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