mirror of
https://github.com/miniflux/v2.git
synced 2024-08-28 23:27:20 +02:00
162 lines
4.1 KiB
Go
162 lines
4.1 KiB
Go
// Copyright 2013 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
// +build ignore
|
|
|
|
package main
|
|
|
|
// This program generates tables.go:
|
|
// go run maketables.go | gofmt > tables.go
|
|
|
|
import (
|
|
"bufio"
|
|
"fmt"
|
|
"log"
|
|
"net/http"
|
|
"sort"
|
|
"strings"
|
|
)
|
|
|
|
func main() {
|
|
fmt.Printf("// generated by go run maketables.go; DO NOT EDIT\n\n")
|
|
fmt.Printf("// Package simplifiedchinese provides Simplified Chinese encodings such as GBK.\n")
|
|
fmt.Printf(`package simplifiedchinese // import "golang.org/x/text/encoding/simplifiedchinese"` + "\n\n")
|
|
|
|
printGB18030()
|
|
printGBK()
|
|
}
|
|
|
|
func printGB18030() {
|
|
res, err := http.Get("http://encoding.spec.whatwg.org/index-gb18030.txt")
|
|
if err != nil {
|
|
log.Fatalf("Get: %v", err)
|
|
}
|
|
defer res.Body.Close()
|
|
|
|
fmt.Printf("// gb18030 is the table from http://encoding.spec.whatwg.org/index-gb18030.txt\n")
|
|
fmt.Printf("var gb18030 = [...][2]uint16{\n")
|
|
scanner := bufio.NewScanner(res.Body)
|
|
for scanner.Scan() {
|
|
s := strings.TrimSpace(scanner.Text())
|
|
if s == "" || s[0] == '#' {
|
|
continue
|
|
}
|
|
x, y := uint32(0), uint32(0)
|
|
if _, err := fmt.Sscanf(s, "%d 0x%x", &x, &y); err != nil {
|
|
log.Fatalf("could not parse %q", s)
|
|
}
|
|
if x < 0x10000 && y < 0x10000 {
|
|
fmt.Printf("\t{0x%04x, 0x%04x},\n", x, y)
|
|
}
|
|
}
|
|
fmt.Printf("}\n\n")
|
|
}
|
|
|
|
func printGBK() {
|
|
res, err := http.Get("http://encoding.spec.whatwg.org/index-gbk.txt")
|
|
if err != nil {
|
|
log.Fatalf("Get: %v", err)
|
|
}
|
|
defer res.Body.Close()
|
|
|
|
mapping := [65536]uint16{}
|
|
reverse := [65536]uint16{}
|
|
|
|
scanner := bufio.NewScanner(res.Body)
|
|
for scanner.Scan() {
|
|
s := strings.TrimSpace(scanner.Text())
|
|
if s == "" || s[0] == '#' {
|
|
continue
|
|
}
|
|
x, y := uint16(0), uint16(0)
|
|
if _, err := fmt.Sscanf(s, "%d 0x%x", &x, &y); err != nil {
|
|
log.Fatalf("could not parse %q", s)
|
|
}
|
|
if x < 0 || 126*190 <= x {
|
|
log.Fatalf("GBK code %d is out of range", x)
|
|
}
|
|
mapping[x] = y
|
|
if reverse[y] == 0 {
|
|
c0, c1 := x/190, x%190
|
|
if c1 >= 0x3f {
|
|
c1++
|
|
}
|
|
reverse[y] = (0x81+c0)<<8 | (0x40 + c1)
|
|
}
|
|
}
|
|
if err := scanner.Err(); err != nil {
|
|
log.Fatalf("scanner error: %v", err)
|
|
}
|
|
|
|
fmt.Printf("// decode is the decoding table from GBK code to Unicode.\n")
|
|
fmt.Printf("// It is defined at http://encoding.spec.whatwg.org/index-gbk.txt\n")
|
|
fmt.Printf("var decode = [...]uint16{\n")
|
|
for i, v := range mapping {
|
|
if v != 0 {
|
|
fmt.Printf("\t%d: 0x%04X,\n", i, v)
|
|
}
|
|
}
|
|
fmt.Printf("}\n\n")
|
|
|
|
// Any run of at least separation continuous zero entries in the reverse map will
|
|
// be a separate encode table.
|
|
const separation = 1024
|
|
|
|
intervals := []interval(nil)
|
|
low, high := -1, -1
|
|
for i, v := range reverse {
|
|
if v == 0 {
|
|
continue
|
|
}
|
|
if low < 0 {
|
|
low = i
|
|
} else if i-high >= separation {
|
|
if high >= 0 {
|
|
intervals = append(intervals, interval{low, high})
|
|
}
|
|
low = i
|
|
}
|
|
high = i + 1
|
|
}
|
|
if high >= 0 {
|
|
intervals = append(intervals, interval{low, high})
|
|
}
|
|
sort.Sort(byDecreasingLength(intervals))
|
|
|
|
fmt.Printf("const numEncodeTables = %d\n\n", len(intervals))
|
|
fmt.Printf("// encodeX are the encoding tables from Unicode to GBK code,\n")
|
|
fmt.Printf("// sorted by decreasing length.\n")
|
|
for i, v := range intervals {
|
|
fmt.Printf("// encode%d: %5d entries for runes in [%5d, %5d).\n", i, v.len(), v.low, v.high)
|
|
}
|
|
fmt.Printf("\n")
|
|
|
|
for i, v := range intervals {
|
|
fmt.Printf("const encode%dLow, encode%dHigh = %d, %d\n\n", i, i, v.low, v.high)
|
|
fmt.Printf("var encode%d = [...]uint16{\n", i)
|
|
for j := v.low; j < v.high; j++ {
|
|
x := reverse[j]
|
|
if x == 0 {
|
|
continue
|
|
}
|
|
fmt.Printf("\t%d-%d: 0x%04X,\n", j, v.low, x)
|
|
}
|
|
fmt.Printf("}\n\n")
|
|
}
|
|
}
|
|
|
|
// interval is a half-open interval [low, high).
|
|
type interval struct {
|
|
low, high int
|
|
}
|
|
|
|
func (i interval) len() int { return i.high - i.low }
|
|
|
|
// byDecreasingLength sorts intervals by decreasing length.
|
|
type byDecreasingLength []interval
|
|
|
|
func (b byDecreasingLength) Len() int { return len(b) }
|
|
func (b byDecreasingLength) Less(i, j int) bool { return b[i].len() > b[j].len() }
|
|
func (b byDecreasingLength) Swap(i, j int) { b[i], b[j] = b[j], b[i] }
|