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// Copyright 2017 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 enctest
import (
"bytes"
"fmt"
"io"
"io/ioutil"
"strings"
"testing"
"golang.org/x/text/encoding"
"golang.org/x/text/encoding/internal/identifier"
"golang.org/x/text/transform"
)
// Encoder or Decoder
type Transcoder interface {
transform.Transformer
Bytes([]byte) ([]byte, error)
String(string) (string, error)
}
func TestEncoding(t *testing.T, e encoding.Encoding, encoded, utf8, prefix, suffix string) {
for _, direction := range []string{"Decode", "Encode"} {
t.Run(fmt.Sprintf("%v/%s", e, direction), func(t *testing.T) {
var coder Transcoder
var want, src, wPrefix, sPrefix, wSuffix, sSuffix string
if direction == "Decode" {
coder, want, src = e.NewDecoder(), utf8, encoded
wPrefix, sPrefix, wSuffix, sSuffix = "", prefix, "", suffix
} else {
coder, want, src = e.NewEncoder(), encoded, utf8
wPrefix, sPrefix, wSuffix, sSuffix = prefix, "", suffix, ""
}
dst := make([]byte, len(wPrefix)+len(want)+len(wSuffix))
nDst, nSrc, err := coder.Transform(dst, []byte(sPrefix+src+sSuffix), true)
if err != nil {
t.Fatal(err)
}
if nDst != len(wPrefix)+len(want)+len(wSuffix) {
t.Fatalf("nDst got %d, want %d",
nDst, len(wPrefix)+len(want)+len(wSuffix))
}
if nSrc != len(sPrefix)+len(src)+len(sSuffix) {
t.Fatalf("nSrc got %d, want %d",
nSrc, len(sPrefix)+len(src)+len(sSuffix))
}
if got := string(dst); got != wPrefix+want+wSuffix {
t.Fatalf("\ngot %q\nwant %q", got, wPrefix+want+wSuffix)
}
for _, n := range []int{0, 1, 2, 10, 123, 4567} {
input := sPrefix + strings.Repeat(src, n) + sSuffix
g, err := coder.String(input)
if err != nil {
t.Fatalf("Bytes: n=%d: %v", n, err)
}
if len(g) == 0 && len(input) == 0 {
// If the input is empty then the output can be empty,
// regardless of whatever wPrefix is.
continue
}
got1, want1 := string(g), wPrefix+strings.Repeat(want, n)+wSuffix
if got1 != want1 {
t.Fatalf("ReadAll: n=%d\ngot %q\nwant %q",
n, trim(got1), trim(want1))
}
}
})
}
}
func TestFile(t *testing.T, e encoding.Encoding) {
for _, dir := range []string{"Decode", "Encode"} {
t.Run(fmt.Sprintf("%s/%s", e, dir), func(t *testing.T) {
dst, src, transformer, err := load(dir, e)
if err != nil {
t.Fatalf("load: %v", err)
}
buf, err := transformer.Bytes(src)
if err != nil {
t.Fatalf("transform: %v", err)
}
if !bytes.Equal(buf, dst) {
t.Error("transformed bytes did not match golden file")
}
})
}
}
func Benchmark(b *testing.B, enc encoding.Encoding) {
for _, direction := range []string{"Decode", "Encode"} {
b.Run(fmt.Sprintf("%s/%s", enc, direction), func(b *testing.B) {
_, src, transformer, err := load(direction, enc)
if err != nil {
b.Fatal(err)
}
b.SetBytes(int64(len(src)))
b.ResetTimer()
for i := 0; i < b.N; i++ {
r := transform.NewReader(bytes.NewReader(src), transformer)
io.Copy(ioutil.Discard, r)
}
})
}
}
// testdataFiles are files in testdata/*.txt.
var testdataFiles = []struct {
mib identifier.MIB
basename, ext string
}{
{identifier.Windows1252, "candide", "windows-1252"},
{identifier.EUCPkdFmtJapanese, "rashomon", "euc-jp"},
{identifier.ISO2022JP, "rashomon", "iso-2022-jp"},
{identifier.ShiftJIS, "rashomon", "shift-jis"},
{identifier.EUCKR, "unsu-joh-eun-nal", "euc-kr"},
{identifier.GBK, "sunzi-bingfa-simplified", "gbk"},
{identifier.HZGB2312, "sunzi-bingfa-gb-levels-1-and-2", "hz-gb2312"},
{identifier.Big5, "sunzi-bingfa-traditional", "big5"},
{identifier.UTF16LE, "candide", "utf-16le"},
{identifier.UTF8, "candide", "utf-8"},
{identifier.UTF32BE, "candide", "utf-32be"},
// GB18030 is a superset of GBK and is nominally a Simplified Chinese
// encoding, but it can also represent the entire Basic Multilingual
// Plane, including codepoints like 'â' that aren't encodable by GBK.
// GB18030 on Simplified Chinese should perform similarly to GBK on
// Simplified Chinese. GB18030 on "candide" is more interesting.
{identifier.GB18030, "candide", "gb18030"},
}
func load(direction string, enc encoding.Encoding) ([]byte, []byte, Transcoder, error) {
basename, ext, count := "", "", 0
for _, tf := range testdataFiles {
if mib, _ := enc.(identifier.Interface).ID(); tf.mib == mib {
basename, ext = tf.basename, tf.ext
count++
}
}
if count != 1 {
if count == 0 {
return nil, nil, nil, fmt.Errorf("no testdataFiles for %s", enc)
}
return nil, nil, nil, fmt.Errorf("too many testdataFiles for %s", enc)
}
dstFile := fmt.Sprintf("../testdata/%s-%s.txt", basename, ext)
srcFile := fmt.Sprintf("../testdata/%s-utf-8.txt", basename)
var coder Transcoder = encoding.ReplaceUnsupported(enc.NewEncoder())
if direction == "Decode" {
dstFile, srcFile = srcFile, dstFile
coder = enc.NewDecoder()
}
dst, err := ioutil.ReadFile(dstFile)
if err != nil {
if dst, err = ioutil.ReadFile("../" + dstFile); err != nil {
return nil, nil, nil, err
}
}
src, err := ioutil.ReadFile(srcFile)
if err != nil {
if src, err = ioutil.ReadFile("../" + srcFile); err != nil {
return nil, nil, nil, err
}
}
return dst, src, coder, nil
}
func trim(s string) string {
if len(s) < 120 {
return s
}
return s[:50] + "..." + s[len(s)-50:]
}
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