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- // 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] }
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