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package main
import (
"bufio"
"bytes"
"fmt"
"io/ioutil"
"net/http"
"os"
"strconv"
"strings"
)
const outPath = "../util/unicode_case_folding.go"
type caseFolding struct {
Class byte
From rune
To []rune
}
func main() {
url := "http://www.unicode.org/Public/14.0.0/ucd/CaseFolding.txt"
resp, err := http.Get(url)
if err != nil {
fmt.Printf("Failed to get CaseFolding.txt: %v\n", err)
os.Exit(1)
}
defer resp.Body.Close()
bs, err := ioutil.ReadAll(resp.Body)
if err != nil {
fmt.Printf("Failed to get CaseFolding.txt: %v\n", err)
os.Exit(1)
}
buf := bytes.NewBuffer(bs)
scanner := bufio.NewScanner(buf)
f, err := os.Create(outPath)
if err != nil {
fmt.Printf("Failed to open %s: %v\n", outPath, err)
os.Exit(1)
}
defer f.Close()
_, _ = f.WriteString("package util\n\n")
_, _ = f.WriteString("var unicodeCaseFoldings = map[rune][]rune {\n")
for scanner.Scan() {
line := scanner.Text()
if strings.HasPrefix(line, "#") || len(strings.TrimSpace(line)) == 0 {
continue
}
line = strings.Split(line, "#")[0]
parts := strings.Split(line, ";")
for i, p := range parts {
parts[i] = strings.TrimSpace(p)
}
cf := caseFolding{}
v, _ := strconv.ParseInt(parts[0], 16, 32)
cf.From = rune(int32(v))
cf.Class = parts[1][0]
for _, v := range strings.Split(parts[2], " ") {
c, _ := strconv.ParseInt(v, 16, 32)
cf.To = append(cf.To, rune(int32(c)))
}
if cf.Class != 'C' && cf.Class != 'F' {
continue
}
fmt.Fprintf(f, " %#x : %#v,\n", cf.From, cf.To)
}
fmt.Fprintf(f, "}\n")
}
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