devlopment branch (#1736)

vendor/github.com/chai2010/gettext-go/gettext/po/comment.go

@@ -0,0 +1,270 @@
+// Copyright 2013 ChaiShushan <chaishushan{AT}gmail.com>. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package po
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"strconv"
+	"strings"
+)
+
+// Comment represents every message's comments.
+type Comment struct {
+	StartLine         int      // comment start line
+	TranslatorComment string   // #  translator-comments // TrimSpace
+	ExtractedComment  string   // #. extracted-comments
+	ReferenceFile     []string // #: src/msgcmp.c:338 src/po-lex.c:699
+	ReferenceLine     []int    // #: src/msgcmp.c:338 src/po-lex.c:699
+	Flags             []string // #, fuzzy,c-format,range:0..10
+	PrevMsgContext    string   // #| msgctxt previous-context
+	PrevMsgId         string   // #| msgid previous-untranslated-string
+}
+
+func (p *Comment) less(q *Comment) bool {
+	if p.StartLine != 0 || q.StartLine != 0 {
+		return p.StartLine < q.StartLine
+	}
+	if a, b := len(p.ReferenceFile), len(q.ReferenceFile); a != b {
+		return a < b
+	}
+	for i := 0; i < len(p.ReferenceFile); i++ {
+		if a, b := p.ReferenceFile[i], q.ReferenceFile[i]; a != b {
+			return a < b
+		}
+		if a, b := p.ReferenceLine[i], q.ReferenceLine[i]; a != b {
+			return a < b
+		}
+	}
+	return false
+}
+
+func (p *Comment) readPoComment(r *lineReader) (err error) {
+	*p = Comment{}
+	if err = r.skipBlankLine(); err != nil {
+		return err
+	}
+	defer func(oldPos int) {
+		newPos := r.currentPos()
+		if newPos != oldPos && err == io.EOF {
+			err = nil
+		}
+	}(r.currentPos())
+
+	p.StartLine = r.currentPos() + 1
+	for {
+		var s string
+		if s, _, err = r.currentLine(); err != nil {
+			return
+		}
+		if len(s) == 0 || s[0] != '#' {
+			return
+		}
+
+		if err = p.readTranslatorComment(r); err != nil {
+			return
+		}
+		if err = p.readExtractedComment(r); err != nil {
+			return
+		}
+		if err = p.readReferenceComment(r); err != nil {
+			return
+		}
+		if err = p.readFlagsComment(r); err != nil {
+			return
+		}
+		if err = p.readPrevMsgContext(r); err != nil {
+			return
+		}
+		if err = p.readPrevMsgId(r); err != nil {
+			return
+		}
+	}
+}
+
+func (p *Comment) readTranslatorComment(r *lineReader) (err error) {
+	const prefix = "# " // .,:|
+	for {
+		var s string
+		if s, _, err = r.readLine(); err != nil {
+			return err
+		}
+		if len(s) < 1 || s[0] != '#' {
+			r.unreadLine()
+			return nil
+		}
+		if len(s) >= 2 {
+			switch s[1] {
+			case '.', ',', ':', '|':
+				r.unreadLine()
+				return nil
+			}
+		}
+		if p.TranslatorComment != "" {
+			p.TranslatorComment += "\n"
+		}
+		p.TranslatorComment += strings.TrimSpace(s[1:])
+	}
+}
+
+func (p *Comment) readExtractedComment(r *lineReader) (err error) {
+	const prefix = "#."
+	for {
+		var s string
+		if s, _, err = r.readLine(); err != nil {
+			return err
+		}
+		if len(s) < len(prefix) || s[:len(prefix)] != prefix {
+			r.unreadLine()
+			return nil
+		}
+		if p.ExtractedComment != "" {
+			p.ExtractedComment += "\n"
+		}
+		p.ExtractedComment += strings.TrimSpace(s[len(prefix):])
+	}
+}
+
+func (p *Comment) readReferenceComment(r *lineReader) (err error) {
+	const prefix = "#:"
+	for {
+		var s string
+		if s, _, err = r.readLine(); err != nil {
+			return err
+		}
+		if len(s) < len(prefix) || s[:len(prefix)] != prefix {
+			r.unreadLine()
+			return nil
+		}
+		ss := strings.Split(strings.TrimSpace(s[len(prefix):]), " ")
+		for i := 0; i < len(ss); i++ {
+			idx := strings.Index(ss[i], ":")
+			if idx <= 0 {
+				continue
+			}
+			name := strings.TrimSpace(ss[i][:idx])
+			line, _ := strconv.Atoi(strings.TrimSpace(ss[i][idx+1:]))
+			p.ReferenceFile = append(p.ReferenceFile, name)
+			p.ReferenceLine = append(p.ReferenceLine, line)
+		}
+	}
+}
+
+func (p *Comment) readFlagsComment(r *lineReader) (err error) {
+	const prefix = "#,"
+	for {
+		var s string
+		if s, _, err = r.readLine(); err != nil {
+			return err
+		}
+		if len(s) < len(prefix) || s[:len(prefix)] != prefix {
+			r.unreadLine()
+			return nil
+		}
+		ss := strings.Split(strings.TrimSpace(s[len(prefix):]), ",")
+		for i := 0; i < len(ss); i++ {
+			p.Flags = append(p.Flags, strings.TrimSpace(ss[i]))
+		}
+	}
+}
+
+func (p *Comment) readPrevMsgContext(r *lineReader) (err error) {
+	var s string
+	if s, _, err = r.currentLine(); err != nil {
+		return
+	}
+	if !rePrevMsgContextComments.MatchString(s) {
+		return
+	}
+	p.PrevMsgContext, err = p.readString(r)
+	return
+}
+
+func (p *Comment) readPrevMsgId(r *lineReader) (err error) {
+	var s string
+	if s, _, err = r.currentLine(); err != nil {
+		return
+	}
+	if !rePrevMsgIdComments.MatchString(s) {
+		return
+	}
+	p.PrevMsgId, err = p.readString(r)
+	return
+}
+
+func (p *Comment) readString(r *lineReader) (msg string, err error) {
+	var s string
+	if s, _, err = r.readLine(); err != nil {
+		return
+	}
+	msg += decodePoString(s)
+	for {
+		if s, _, err = r.readLine(); err != nil {
+			return
+		}
+		if !reStringLineComments.MatchString(s) {
+			r.unreadLine()
+			break
+		}
+		msg += decodePoString(s)
+	}
+	return
+}
+
+// GetFuzzy gets the fuzzy flag.
+func (p *Comment) GetFuzzy() bool {
+	for _, s := range p.Flags {
+		if s == "fuzzy" {
+			return true
+		}
+	}
+	return false
+}
+
+// SetFuzzy sets the fuzzy flag.
+func (p *Comment) SetFuzzy(fuzzy bool) {
+	//
+}
+
+// String returns the po format comment string.
+func (p Comment) String() string {
+	var buf bytes.Buffer
+	if p.TranslatorComment != "" {
+		ss := strings.Split(p.TranslatorComment, "\n")
+		for i := 0; i < len(ss); i++ {
+			fmt.Fprintf(&buf, "# %s\n", ss[i])
+		}
+	}
+	if p.ExtractedComment != "" {
+		ss := strings.Split(p.ExtractedComment, "\n")
+		for i := 0; i < len(ss); i++ {
+			fmt.Fprintf(&buf, "#. %s\n", ss[i])
+		}
+	}
+	if a, b := len(p.ReferenceFile), len(p.ReferenceLine); a != 0 && a == b {
+		fmt.Fprintf(&buf, "#:")
+		for i := 0; i < len(p.ReferenceFile); i++ {
+			fmt.Fprintf(&buf, " %s:%d", p.ReferenceFile[i], p.ReferenceLine[i])
+		}
+		fmt.Fprintf(&buf, "\n")
+	}
+	if len(p.Flags) != 0 {
+		fmt.Fprintf(&buf, "#, %s", p.Flags[0])
+		for i := 1; i < len(p.Flags); i++ {
+			fmt.Fprintf(&buf, ", %s", p.Flags[i])
+		}
+		fmt.Fprintf(&buf, "\n")
+	}
+	if p.PrevMsgContext != "" {
+		s := encodeCommentPoString(p.PrevMsgContext)
+		fmt.Fprintf(&buf, "#| msgctxt %s\n", s)
+	}
+	if p.PrevMsgId != "" {
+		s := encodeCommentPoString(p.PrevMsgId)
+		fmt.Fprintf(&buf, "#| msgid %s\n", s)
+	}
+	return buf.String()
+}

vendor/github.com/chai2010/gettext-go/gettext/po/doc.go

@@ -0,0 +1,24 @@
+// Copyright 2013 ChaiShushan <chaishushan{AT}gmail.com>. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+/*
+Package po provides support for reading and writing GNU PO file.
+
+Examples:
+	import (
+		"github.com/chai2010/gettext-go/gettext/po"
+	)
+
+	func main() {
+		poFile, err := po.Load("test.po")
+		if err != nil {
+			log.Fatal(err)
+		}
+		fmt.Printf("%v", poFile)
+	}
+
+The GNU PO file specification is at
+http://www.gnu.org/software/gettext/manual/html_node/PO-Files.html.
+*/
+package po

vendor/github.com/chai2010/gettext-go/gettext/po/file.go

@@ -0,0 +1,75 @@
+// Copyright 2013 ChaiShushan <chaishushan{AT}gmail.com>. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package po
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"sort"
+)
+
+// File represents an PO File.
+//
+// See http://www.gnu.org/software/gettext/manual/html_node/PO-Files.html
+type File struct {
+	MimeHeader Header
+	Messages   []Message
+}
+
+// Load loads a named po file.
+func Load(name string) (*File, error) {
+	data, err := ioutil.ReadFile(name)
+	if err != nil {
+		return nil, err
+	}
+	return LoadData(data)
+}
+
+// LoadData loads po file format data.
+func LoadData(data []byte) (*File, error) {
+	r := newLineReader(string(data))
+	var file File
+	for {
+		var msg Message
+		if err := msg.readPoEntry(r); err != nil {
+			if err == io.EOF {
+				return &file, nil
+			}
+			return nil, err
+		}
+		if msg.MsgId == "" {
+			file.MimeHeader.parseHeader(&msg)
+			continue
+		}
+		file.Messages = append(file.Messages, msg)
+	}
+}
+
+// Save saves a po file.
+func (f *File) Save(name string) error {
+	return ioutil.WriteFile(name, []byte(f.String()), 0666)
+}
+
+// Save returns a po file format data.
+func (f *File) Data() []byte {
+	// sort the massge as ReferenceFile/ReferenceLine field
+	var messages []Message
+	messages = append(messages, f.Messages...)
+	sort.Sort(byMessages(messages))
+
+	var buf bytes.Buffer
+	fmt.Fprintf(&buf, "%s\n", f.MimeHeader.String())
+	for i := 0; i < len(messages); i++ {
+		fmt.Fprintf(&buf, "%s\n", messages[i].String())
+	}
+	return buf.Bytes()
+}
+
+// String returns the po format file string.
+func (f *File) String() string {
+	return string(f.Data())
+}

vendor/github.com/chai2010/gettext-go/gettext/po/header.go

@@ -0,0 +1,106 @@
+// Copyright 2013 ChaiShushan <chaishushan{AT}gmail.com>. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package po
+
+import (
+	"bytes"
+	"fmt"
+	"strings"
+)
+
+// Header is the initial comments "SOME DESCRIPTIVE TITLE", "YEAR"
+// and "FIRST AUTHOR <EMAIL@ADDRESS>, YEAR" ought to be replaced by sensible information.
+//
+// See http://www.gnu.org/software/gettext/manual/html_node/Header-Entry.html#Header-Entry
+type Header struct {
+	Comment                        // Header Comments
+	ProjectIdVersion        string // Project-Id-Version: PACKAGE VERSION
+	ReportMsgidBugsTo       string // Report-Msgid-Bugs-To: FIRST AUTHOR <EMAIL@ADDRESS>
+	POTCreationDate         string // POT-Creation-Date: YEAR-MO-DA HO:MI+ZONE
+	PORevisionDate          string // PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE
+	LastTranslator          string // Last-Translator: FIRST AUTHOR <EMAIL@ADDRESS>
+	LanguageTeam            string // Language-Team: golang-china
+	Language                string // Language: zh_CN
+	MimeVersion             string // MIME-Version: 1.0
+	ContentType             string // Content-Type: text/plain; charset=UTF-8
+	ContentTransferEncoding string // Content-Transfer-Encoding: 8bit
+	PluralForms             string // Plural-Forms: nplurals=2; plural=n == 1 ? 0 : 1;
+	XGenerator              string // X-Generator: Poedit 1.5.5
+	UnknowFields            map[string]string
+}
+
+func (p *Header) parseHeader(msg *Message) {
+	if msg.MsgId != "" || msg.MsgStr == "" {
+		return
+	}
+	lines := strings.Split(msg.MsgStr, "\n")
+	for i := 0; i < len(lines); i++ {
+		idx := strings.Index(lines[i], ":")
+		if idx < 0 {
+			continue
+		}
+		key := strings.TrimSpace(lines[i][:idx])
+		val := strings.TrimSpace(lines[i][idx+1:])
+		switch strings.ToUpper(key) {
+		case strings.ToUpper("Project-Id-Version"):
+			p.ProjectIdVersion = val
+		case strings.ToUpper("Report-Msgid-Bugs-To"):
+			p.ReportMsgidBugsTo = val
+		case strings.ToUpper("POT-Creation-Date"):
+			p.POTCreationDate = val
+		case strings.ToUpper("PO-Revision-Date"):
+			p.PORevisionDate = val
+		case strings.ToUpper("Last-Translator"):
+			p.LastTranslator = val
+		case strings.ToUpper("Language-Team"):
+			p.LanguageTeam = val
+		case strings.ToUpper("Language"):
+			p.Language = val
+		case strings.ToUpper("MIME-Version"):
+			p.MimeVersion = val
+		case strings.ToUpper("Content-Type"):
+			p.ContentType = val
+		case strings.ToUpper("Content-Transfer-Encoding"):
+			p.ContentTransferEncoding = val
+		case strings.ToUpper("Plural-Forms"):
+			p.PluralForms = val
+		case strings.ToUpper("X-Generator"):
+			p.XGenerator = val
+		default:
+			if p.UnknowFields == nil {
+				p.UnknowFields = make(map[string]string)
+			}
+			p.UnknowFields[key] = val
+		}
+	}
+	p.Comment = msg.Comment
+}
+
+// String returns the po format header string.
+func (p Header) String() string {
+	var buf bytes.Buffer
+	fmt.Fprintf(&buf, "%s", p.Comment.String())
+	fmt.Fprintf(&buf, `msgid ""`+"\n")
+	fmt.Fprintf(&buf, `msgstr ""`+"\n")
+	fmt.Fprintf(&buf, `"%s: %s\n"`+"\n", "Project-Id-Version", p.ProjectIdVersion)
+	fmt.Fprintf(&buf, `"%s: %s\n"`+"\n", "Report-Msgid-Bugs-To", p.ReportMsgidBugsTo)
+	fmt.Fprintf(&buf, `"%s: %s\n"`+"\n", "POT-Creation-Date", p.POTCreationDate)
+	fmt.Fprintf(&buf, `"%s: %s\n"`+"\n", "PO-Revision-Date", p.PORevisionDate)
+	fmt.Fprintf(&buf, `"%s: %s\n"`+"\n", "Last-Translator", p.LastTranslator)
+	fmt.Fprintf(&buf, `"%s: %s\n"`+"\n", "Language-Team", p.LanguageTeam)
+	fmt.Fprintf(&buf, `"%s: %s\n"`+"\n", "Language", p.Language)
+	if p.MimeVersion != "" {
+		fmt.Fprintf(&buf, `"%s: %s\n"`+"\n", "MIME-Version", p.MimeVersion)
+	}
+	fmt.Fprintf(&buf, `"%s: %s\n"`+"\n", "Content-Type", p.ContentType)
+	fmt.Fprintf(&buf, `"%s: %s\n"`+"\n", "Content-Transfer-Encoding", p.ContentTransferEncoding)
+	if p.XGenerator != "" {
+		fmt.Fprintf(&buf, `"%s: %s\n"`+"\n", "X-Generator", p.XGenerator)
+	}
+	for k, v := range p.UnknowFields {
+		fmt.Fprintf(&buf, `"%s: %s\n"`+"\n", k, v)
+	}
+	return buf.String()
+}

vendor/github.com/chai2010/gettext-go/gettext/po/line_reader.go

@@ -0,0 +1,62 @@
+// Copyright 2013 ChaiShushan <chaishushan{AT}gmail.com>. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package po
+
+import (
+	"io"
+	"strings"
+)
+
+type lineReader struct {
+	lines []string
+	pos   int
+}
+
+func newLineReader(data string) *lineReader {
+	data = strings.Replace(data, "\r", "", -1)
+	lines := strings.Split(data, "\n")
+	return &lineReader{lines: lines}
+}
+
+func (r *lineReader) skipBlankLine() error {
+	for ; r.pos < len(r.lines); r.pos++ {
+		if strings.TrimSpace(r.lines[r.pos]) != "" {
+			break
+		}
+	}
+	if r.pos >= len(r.lines) {
+		return io.EOF
+	}
+	return nil
+}
+
+func (r *lineReader) currentPos() int {
+	return r.pos
+}
+
+func (r *lineReader) currentLine() (s string, pos int, err error) {
+	if r.pos >= len(r.lines) {
+		err = io.EOF
+		return
+	}
+	s, pos = r.lines[r.pos], r.pos
+	return
+}
+
+func (r *lineReader) readLine() (s string, pos int, err error) {
+	if r.pos >= len(r.lines) {
+		err = io.EOF
+		return
+	}
+	s, pos = r.lines[r.pos], r.pos
+	r.pos++
+	return
+}
+
+func (r *lineReader) unreadLine() {
+	if r.pos >= 0 {
+		r.pos--
+	}
+}

vendor/github.com/chai2010/gettext-go/gettext/po/message.go

@@ -0,0 +1,189 @@
+// Copyright 2013 ChaiShushan <chaishushan{AT}gmail.com>. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package po
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"strconv"
+	"strings"
+)
+
+// A PO file is made up of many entries,
+// each entry holding the relation between an original untranslated string
+// and its corresponding translation.
+//
+// See http://www.gnu.org/software/gettext/manual/html_node/PO-Files.html
+type Message struct {
+	Comment               // Coments
+	MsgContext   string   // msgctxt context
+	MsgId        string   // msgid untranslated-string
+	MsgIdPlural  string   // msgid_plural untranslated-string-plural
+	MsgStr       string   // msgstr translated-string
+	MsgStrPlural []string // msgstr[0] translated-string-case-0
+}
+
+type byMessages []Message
+
+func (d byMessages) Len() int {
+	return len(d)
+}
+func (d byMessages) Less(i, j int) bool {
+	if d[i].Comment.less(&d[j].Comment) {
+		return true
+	}
+	if a, b := d[i].MsgContext, d[j].MsgContext; a != b {
+		return a < b
+	}
+	if a, b := d[i].MsgId, d[j].MsgId; a != b {
+		return a < b
+	}
+	if a, b := d[i].MsgIdPlural, d[j].MsgIdPlural; a != b {
+		return a < b
+	}
+	return false
+}
+func (d byMessages) Swap(i, j int) {
+	d[i], d[j] = d[j], d[i]
+}
+
+func (p *Message) readPoEntry(r *lineReader) (err error) {
+	*p = Message{}
+	if err = r.skipBlankLine(); err != nil {
+		return
+	}
+	defer func(oldPos int) {
+		newPos := r.currentPos()
+		if newPos != oldPos && err == io.EOF {
+			err = nil
+		}
+	}(r.currentPos())
+
+	if err = p.Comment.readPoComment(r); err != nil {
+		return
+	}
+	for {
+		var s string
+		if s, _, err = r.currentLine(); err != nil {
+			return
+		}
+
+		if p.isInvalidLine(s) {
+			err = fmt.Errorf("gettext: line %d, %v", r.currentPos(), "invalid line")
+			return
+		}
+		if reComment.MatchString(s) || reBlankLine.MatchString(s) {
+			return
+		}
+
+		if err = p.readMsgContext(r); err != nil {
+			return
+		}
+		if err = p.readMsgId(r); err != nil {
+			return
+		}
+		if err = p.readMsgIdPlural(r); err != nil {
+			return
+		}
+		if err = p.readMsgStrOrPlural(r); err != nil {
+			return
+		}
+	}
+}
+
+func (p *Message) readMsgContext(r *lineReader) (err error) {
+	var s string
+	if s, _, err = r.currentLine(); err != nil {
+		return
+	}
+	if !reMsgContext.MatchString(s) {
+		return
+	}
+	p.MsgContext, err = p.readString(r)
+	return
+}
+
+func (p *Message) readMsgId(r *lineReader) (err error) {
+	var s string
+	if s, _, err = r.currentLine(); err != nil {
+		return
+	}
+	if !reMsgId.MatchString(s) {
+		return
+	}
+	p.MsgId, err = p.readString(r)
+	return
+}
+
+func (p *Message) readMsgIdPlural(r *lineReader) (err error) {
+	var s string
+	if s, _, err = r.currentLine(); err != nil {
+		return
+	}
+	if !reMsgIdPlural.MatchString(s) {
+		return
+	}
+	p.MsgIdPlural, err = p.readString(r)
+	return nil
+}
+
+func (p *Message) readMsgStrOrPlural(r *lineReader) (err error) {
+	var s string
+	if s, _, err = r.currentLine(); err != nil {
+		return
+	}
+	if !reMsgStr.MatchString(s) && !reMsgStrPlural.MatchString(s) {
+		return
+	}
+	if reMsgStrPlural.MatchString(s) {
+		left, right := strings.Index(s, `[`), strings.LastIndex(s, `]`)
+		idx, _ := strconv.Atoi(s[left+1 : right])
+		s, err = p.readString(r)
+		if n := len(p.MsgStrPlural); (idx + 1) > n {
+			p.MsgStrPlural = append(p.MsgStrPlural, make([]string, (idx+1)-n)...)
+		}
+		p.MsgStrPlural[idx] = s
+	} else {
+		p.MsgStr, err = p.readString(r)
+	}
+	return nil
+}
+
+func (p *Message) readString(r *lineReader) (msg string, err error) {
+	var s string
+	if s, _, err = r.readLine(); err != nil {
+		return
+	}
+	msg += decodePoString(s)
+	for {
+		if s, _, err = r.readLine(); err != nil {
+			return
+		}
+		if !reStringLine.MatchString(s) {
+			r.unreadLine()
+			break
+		}
+		msg += decodePoString(s)
+	}
+	return
+}
+
+// String returns the po format entry string.
+func (p Message) String() string {
+	var buf bytes.Buffer
+	fmt.Fprintf(&buf, "%s", p.Comment.String())
+	fmt.Fprintf(&buf, "msgid %s", encodePoString(p.MsgId))
+	if p.MsgIdPlural != "" {
+		fmt.Fprintf(&buf, "msgid_plural %s", encodePoString(p.MsgIdPlural))
+	}
+	if p.MsgStr != "" {
+		fmt.Fprintf(&buf, "msgstr %s", encodePoString(p.MsgStr))
+	}
+	for i := 0; i < len(p.MsgStrPlural); i++ {
+		fmt.Fprintf(&buf, "msgstr[%d] %s", i, encodePoString(p.MsgStrPlural[i]))
+	}
+	return buf.String()
+}

vendor/github.com/chai2010/gettext-go/gettext/po/re.go

@@ -0,0 +1,58 @@
+// Copyright 2013 ChaiShushan <chaishushan{AT}gmail.com>. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package po
+
+import (
+	"regexp"
+)
+
+var (
+	reComment                = regexp.MustCompile(`^#`)              // #
+	reExtractedComments      = regexp.MustCompile(`^#\.`)            // #.
+	reReferenceComments      = regexp.MustCompile(`^#:`)             // #:
+	reFlagsComments          = regexp.MustCompile(`^#,`)             // #, fuzzy,c-format
+	rePrevMsgContextComments = regexp.MustCompile(`^#\|\s+msgctxt`)  // #| msgctxt
+	rePrevMsgIdComments      = regexp.MustCompile(`^#\|\s+msgid`)    // #| msgid
+	reStringLineComments     = regexp.MustCompile(`^#\|\s+".*"\s*$`) // #| "message"
+
+	reMsgContext   = regexp.MustCompile(`^msgctxt\s+".*"\s*$`)            // msgctxt
+	reMsgId        = regexp.MustCompile(`^msgid\s+".*"\s*$`)              // msgid
+	reMsgIdPlural  = regexp.MustCompile(`^msgid_plural\s+".*"\s*$`)       // msgid_plural
+	reMsgStr       = regexp.MustCompile(`^msgstr\s*".*"\s*$`)             // msgstr
+	reMsgStrPlural = regexp.MustCompile(`^msgstr\s*(\[\d+\])\s*".*"\s*$`) // msgstr[0]
+	reStringLine   = regexp.MustCompile(`^\s*".*"\s*$`)                   // "message"
+	reBlankLine    = regexp.MustCompile(`^\s*$`)                          //
+)
+
+func (p *Message) isInvalidLine(s string) bool {
+	if reComment.MatchString(s) {
+		return false
+	}
+	if reBlankLine.MatchString(s) {
+		return false
+	}
+
+	if reMsgContext.MatchString(s) {
+		return false
+	}
+	if reMsgId.MatchString(s) {
+		return false
+	}
+	if reMsgIdPlural.MatchString(s) {
+		return false
+	}
+	if reMsgStr.MatchString(s) {
+		return false
+	}
+	if reMsgStrPlural.MatchString(s) {
+		return false
+	}
+
+	if reStringLine.MatchString(s) {
+		return false
+	}
+
+	return true
+}

vendor/github.com/chai2010/gettext-go/gettext/po/util.go

@@ -0,0 +1,110 @@
+// Copyright 2013 ChaiShushan <chaishushan{AT}gmail.com>. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package po
+
+import (
+	"bytes"
+	"strings"
+)
+
+func decodePoString(text string) string {
+	lines := strings.Split(text, "\n")
+	for i := 0; i < len(lines); i++ {
+		left := strings.Index(lines[i], `"`)
+		right := strings.LastIndex(lines[i], `"`)
+		if left < 0 || right < 0 || left == right {
+			lines[i] = ""
+			continue
+		}
+		line := lines[i][left+1 : right]
+		data := make([]byte, 0, len(line))
+		for i := 0; i < len(line); i++ {
+			if line[i] != '\\' {
+				data = append(data, line[i])
+				continue
+			}
+			if i+1 >= len(line) {
+				break
+			}
+			switch line[i+1] {
+			case 'n': // \\n -> \n
+				data = append(data, '\n')
+				i++
+			case 't': // \\t -> \n
+				data = append(data, '\t')
+				i++
+			case '\\': // \\\ -> ?
+				data = append(data, '\\')
+				i++
+			}
+		}
+		lines[i] = string(data)
+	}
+	return strings.Join(lines, "")
+}
+
+func encodePoString(text string) string {
+	var buf bytes.Buffer
+	lines := strings.Split(text, "\n")
+	for i := 0; i < len(lines); i++ {
+		if lines[i] == "" {
+			if i != len(lines)-1 {
+				buf.WriteString(`"\n"` + "\n")
+			}
+			continue
+		}
+		buf.WriteRune('"')
+		for _, r := range lines[i] {
+			switch r {
+			case '\\':
+				buf.WriteString(`\\`)
+			case '"':
+				buf.WriteString(`\"`)
+			case '\n':
+				buf.WriteString(`\n`)
+			case '\t':
+				buf.WriteString(`\t`)
+			default:
+				buf.WriteRune(r)
+			}
+		}
+		buf.WriteString(`\n"` + "\n")
+	}
+	return buf.String()
+}
+
+func encodeCommentPoString(text string) string {
+	var buf bytes.Buffer
+	lines := strings.Split(text, "\n")
+	if len(lines) > 1 {
+		buf.WriteString(`""` + "\n")
+	}
+	for i := 0; i < len(lines); i++ {
+		if len(lines) > 0 {
+			buf.WriteString("#| ")
+		}
+		buf.WriteRune('"')
+		for _, r := range lines[i] {
+			switch r {
+			case '\\':
+				buf.WriteString(`\\`)
+			case '"':
+				buf.WriteString(`\"`)
+			case '\n':
+				buf.WriteString(`\n`)
+			case '\t':
+				buf.WriteString(`\t`)
+			default:
+				buf.WriteRune(r)
+			}
+		}
+		if i < len(lines)-1 {
+			buf.WriteString(`\n"` + "\n")
+		} else {
+			buf.WriteString(`"`)
+		}
+	}
+	return buf.String()
+}