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jisyo.go
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jisyo.go
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package skk
import (
"bufio"
"bytes"
"fmt"
"io"
"os"
"os/user"
"path/filepath"
"regexp"
"strings"
"time"
"golang.org/x/text/encoding/japanese"
)
const (
ariHeader = ";; okuri-ari entries."
nasiHeader = ";; okuri-nasi entries."
)
type _History struct {
key string
val []string
}
// Jisyo is a dictionary that contains user or system dictionary.
type Jisyo struct {
ari map[string][]string
nasi map[string][]string
ariHistory []_History
nasiHistory []_History
}
func newJisyo() *Jisyo {
return &Jisyo{
ari: map[string][]string{},
nasi: map[string][]string{},
}
}
func (j *Jisyo) lookup(key string, okuri bool) (candidates []string, ok bool) {
if okuri {
candidates, ok = j.ari[key]
} else {
candidates, ok = j.nasi[key]
}
return
}
func (j *Jisyo) store(key string, okuri bool, value []string) {
if okuri {
j.ari[key] = value
} else {
j.nasi[key] = value
}
}
func (j *Jisyo) storeAndLearn(key string, okuri bool, value []string) {
j.store(key, okuri, value)
if okuri {
j.ariHistory = append(j.ariHistory, _History{key: key, val: value})
} else {
j.nasiHistory = append(j.nasiHistory, _History{key: key, val: value})
}
}
func (j *Jisyo) remove(key string, okuri bool) {
if okuri {
delete(j.ari, key)
j.ariHistory = append(j.ariHistory, _History{key: key, val: nil})
} else {
delete(j.nasi, key)
j.nasiHistory = append(j.nasiHistory, _History{key: key, val: nil})
}
}
var percentEnv = regexp.MustCompile(`%.*?%`)
func expandEnv(s string) string {
if len(s) > 0 && s[0] == '~' {
if u, err := user.Current(); err == nil {
s = u.HomeDir + s[1:]
}
}
return percentEnv.ReplaceAllStringFunc(s, func(m string) string {
name := m[1 : len(m)-1]
if value, ok := os.LookupEnv(name); ok {
return value
}
return m
})
}
// Load reads the contents of an dictionary from a file.
// It returns time-stamp and error.
func (j *Jisyo) Load(filename string) error {
filename = expandEnv(filename)
matches, err := filepath.Glob(filename)
if err != nil {
_, err = j.load(filename)
return err
}
for _, fn := range matches {
if _, err = j.load(fn); err != nil {
return err
}
}
return nil
}
func (j *Jisyo) load(filename string) (time.Time, error) {
var stamp time.Time
fd, err := os.Open(filename)
if err != nil {
return stamp, err
}
defer fd.Close()
stat, err := fd.Stat()
if err == nil {
stamp = stat.ModTime()
}
return stamp, j.Read(fd)
}
func (j *Jisyo) readOne(line string, okuri bool) bool {
if len(line) > 2 && line[0] == ';' && line[1] == ';' {
if strings.HasPrefix(line, ariHeader) {
okuri = true
} else if strings.HasPrefix(line, nasiHeader) {
okuri = false
}
return okuri
}
if len(line) <= 0 || line[0] == ';' {
return okuri
}
source, lists, ok := strings.Cut(line, " /")
if !ok {
return okuri
}
values, _ := j.lookup(source, okuri)
for {
one, rest, ok := strings.Cut(lists, "/")
if one != "" {
values = append(values, one)
}
if !ok {
break
}
lists = rest
}
j.store(source, okuri, values)
return okuri
}
func pragma(line string) map[string]string {
_, body, ok := strings.Cut(line, "-*-")
if !ok {
return nil
}
body, _, ok = strings.Cut(body, "-*-")
if !ok {
return nil
}
m := map[string]string{}
for ok {
var token string
token, body, ok = strings.Cut(body, ";")
if key, value, valid := strings.Cut(token, ":"); valid {
m[strings.TrimSpace(key)] = strings.TrimSpace(value)
}
}
return m
}
func peekLine(r io.Reader) (io.Reader, string, error) {
var buffer bytes.Buffer
br := bufio.NewReader(r)
line, err := br.ReadString('\n')
buffer.WriteString(line)
io.CopyN(&buffer, br, int64(br.Buffered()))
if err == io.EOF {
return &buffer, line, nil
}
return io.MultiReader(&buffer, r), line, err
}
func (j *Jisyo) Read(r io.Reader) error {
utf8mode := false
r, line, err := peekLine(r)
if err != nil {
return err
}
if len(line) > 0 && line[0] == ';' {
if m := pragma(line[1:]); m != nil && m["coding"] == "utf-8" {
utf8mode = true
}
}
if !utf8mode {
r = japanese.EUCJP.NewDecoder().Reader(r)
}
sc := bufio.NewScanner(r)
okuri := false
for sc.Scan() {
okuri = j.readOne(sc.Text(), okuri)
}
return sc.Err()
}
func dumpPair(key string, list []string, w io.Writer) (n int64, err error) {
var wc writeCounter
if wc.Try(io.WriteString(w, key)) || wc.Try(io.WriteString(w, " /")) {
return wc.Result()
}
for _, candidate := range list {
if wc.Try(io.WriteString(w, candidate)) || wc.Try(io.WriteString(w, "/")) {
return wc.Result()
}
}
wc.Try(io.WriteString(w, "\n"))
return wc.Result()
}
// WriteTo outputs the contents of dictonary with UTF8
func (j *Jisyo) writeTo(w io.Writer) (n int64, err error) {
var wc writeCounter
if wc.Try(fmt.Fprintln(w, ariHeader)) {
return wc.Result()
}
for key, list := range j.ari {
if wc.Try64(dumpPair(key, list, w)) {
return wc.Result()
}
}
if wc.Try(fmt.Fprintf(w, "\n%s\n", nasiHeader)) {
return wc.Result()
}
for key, list := range j.nasi {
if wc.Try64(dumpPair(key, list, w)) {
return wc.Result()
}
}
return wc.Result()
}
func (j *Jisyo) saveAs(fname string) error {
fd, err := os.Create(fname)
if err != nil {
return err
}
if _, err := j.writeToUtf8(fd); err != nil {
fd.Close()
return err
}
return fd.Close()
}
func (j *Jisyo) writeToUtf8(w io.Writer) (n int64, err error) {
var wc writeCounter
if wc.Try(fmt.Fprintln(w, ";; -*- mode: fundamental; coding: utf-8 -*-")) {
return wc.Result()
}
wc.Try64(j.writeTo(w))
return wc.Result()
}