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// Copyright 2015 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.
package message // import "golang.org/x/text/message"
import (
"io"
"os"
// Include features to facilitate generated catalogs.
_ "golang.org/x/text/feature/plural"
"golang.org/x/text/internal/number"
"golang.org/x/text/language"
"golang.org/x/text/message/catalog"
)
// A Printer implements language-specific formatted I/O analogous to the fmt
// package.
type Printer struct {
// the language
tag language.Tag
toDecimal number.Formatter
toScientific number.Formatter
cat catalog.Catalog
}
type options struct {
cat catalog.Catalog
// TODO:
// - allow %s to print integers in written form (tables are likely too large
// to enable this by default).
// - list behavior
//
}
// An Option defines an option of a Printer.
type Option func(o *options)
// Catalog defines the catalog to be used.
func Catalog(c catalog.Catalog) Option {
return func(o *options) { o.cat = c }
}
// NewPrinter returns a Printer that formats messages tailored to language t.
func NewPrinter(t language.Tag, opts ...Option) *Printer {
options := &options{
cat: DefaultCatalog,
}
for _, o := range opts {
o(options)
}
p := &Printer{
tag: t,
cat: options.cat,
}
p.toDecimal.InitDecimal(t)
p.toScientific.InitScientific(t)
return p
}
// Sprint is like fmt.Sprint, but using language-specific formatting.
func (p *Printer) Sprint(a ...interface{}) string {
pp := newPrinter(p)
pp.doPrint(a)
s := pp.String()
pp.free()
return s
}
// Fprint is like fmt.Fprint, but using language-specific formatting.
func (p *Printer) Fprint(w io.Writer, a ...interface{}) (n int, err error) {
pp := newPrinter(p)
pp.doPrint(a)
n64, err := io.Copy(w, &pp.Buffer)
pp.free()
return int(n64), err
}
// Print is like fmt.Print, but using language-specific formatting.
func (p *Printer) Print(a ...interface{}) (n int, err error) {
return p.Fprint(os.Stdout, a...)
}
// Sprintln is like fmt.Sprintln, but using language-specific formatting.
func (p *Printer) Sprintln(a ...interface{}) string {
pp := newPrinter(p)
pp.doPrintln(a)
s := pp.String()
pp.free()
return s
}
// Fprintln is like fmt.Fprintln, but using language-specific formatting.
func (p *Printer) Fprintln(w io.Writer, a ...interface{}) (n int, err error) {
pp := newPrinter(p)
pp.doPrintln(a)
n64, err := io.Copy(w, &pp.Buffer)
pp.free()
return int(n64), err
}
// Println is like fmt.Println, but using language-specific formatting.
func (p *Printer) Println(a ...interface{}) (n int, err error) {
return p.Fprintln(os.Stdout, a...)
}
// Sprintf is like fmt.Sprintf, but using language-specific formatting.
func (p *Printer) Sprintf(key Reference, a ...interface{}) string {
pp := newPrinter(p)
lookupAndFormat(pp, key, a)
s := pp.String()
pp.free()
return s
}
// Fprintf is like fmt.Fprintf, but using language-specific formatting.
func (p *Printer) Fprintf(w io.Writer, key Reference, a ...interface{}) (n int, err error) {
pp := newPrinter(p)
lookupAndFormat(pp, key, a)
n, err = w.Write(pp.Bytes())
pp.free()
return n, err
}
// Printf is like fmt.Printf, but using language-specific formatting.
func (p *Printer) Printf(key Reference, a ...interface{}) (n int, err error) {
pp := newPrinter(p)
lookupAndFormat(pp, key, a)
n, err = os.Stdout.Write(pp.Bytes())
pp.free()
return n, err
}
func lookupAndFormat(p *printer, r Reference, a []interface{}) {
p.fmt.Reset(a)
switch v := r.(type) {
case string:
if p.catContext.Execute(v) == catalog.ErrNotFound {
p.Render(v)
return
}
case key:
if p.catContext.Execute(v.id) == catalog.ErrNotFound &&
p.catContext.Execute(v.fallback) == catalog.ErrNotFound {
p.Render(v.fallback)
return
}
default:
panic("key argument is not a Reference")
}
}
type rawPrinter struct {
p *printer
}
func (p rawPrinter) Render(msg string) { p.p.WriteString(msg) }
func (p rawPrinter) Arg(i int) interface{} { return nil }
// Arg implements catmsg.Renderer.
func (p *printer) Arg(i int) interface{} { // TODO, also return "ok" bool
i--
if uint(i) < uint(len(p.fmt.Args)) {
return p.fmt.Args[i]
}
return nil
}
// Render implements catmsg.Renderer.
func (p *printer) Render(msg string) {
p.doPrintf(msg)
}
// A Reference is a string or a message reference.
type Reference interface {
// TODO: also allow []string
}
// Key creates a message Reference for a message where the given id is used for
// message lookup and the fallback is returned when no matches are found.
func Key(id string, fallback string) Reference {
return key{id, fallback}
}
type key struct {
id, fallback string
}