// Copyright 2009 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 utf8_test
import (
"bytes"
"testing"
"unicode"
. "unicode/utf8"
)
// Validate the constants redefined from unicode.
func init() {
if MaxRune != unicode.MaxRune {
panic("utf8.MaxRune is wrong")
}
if RuneError != unicode.ReplacementChar {
panic("utf8.RuneError is wrong")
}
}
// Validate the constants redefined from unicode.
func TestConstants(t *testing.T) {
if MaxRune != unicode.MaxRune {
t.Errorf("utf8.MaxRune is wrong: %x should be %x", MaxRune, unicode.MaxRune)
}
if RuneError != unicode.ReplacementChar {
t.Errorf("utf8.RuneError is wrong: %x should be %x", RuneError, unicode.ReplacementChar)
}
}
type Utf8Map struct {
r rune
str string
}
var utf8map = []Utf8Map{
{0x0000, "\x00"},
{0x0001, "\x01"},
{0x007e, "\x7e"},
{0x007f, "\x7f"},
{0x0080, "\xc2\x80"},
{0x0081, "\xc2\x81"},
{0x00bf, "\xc2\xbf"},
{0x00c0, "\xc3\x80"},
{0x00c1, "\xc3\x81"},
{0x00c8, "\xc3\x88"},
{0x00d0, "\xc3\x90"},
{0x00e0, "\xc3\xa0"},
{0x00f0, "\xc3\xb0"},
{0x00f8, "\xc3\xb8"},
{0x00ff, "\xc3\xbf"},
{0x0100, "\xc4\x80"},
{0x07ff, "\xdf\xbf"},
{0x0400, "\xd0\x80"},
{0x0800, "\xe0\xa0\x80"},
{0x0801, "\xe0\xa0\x81"},
{0x1000, "\xe1\x80\x80"},
{0xd000, "\xed\x80\x80"},
{0xd7ff, "\xed\x9f\xbf"}, // last code point before surrogate half.
{0xe000, "\xee\x80\x80"}, // first code point after surrogate half.
{0xfffe, "\xef\xbf\xbe"},
{0xffff, "\xef\xbf\xbf"},
{0x10000, "\xf0\x90\x80\x80"},
{0x10001, "\xf0\x90\x80\x81"},
{0x40000, "\xf1\x80\x80\x80"},
{0x10fffe, "\xf4\x8f\xbf\xbe"},
{0x10ffff, "\xf4\x8f\xbf\xbf"},
{0xFFFD, "\xef\xbf\xbd"},
}
var surrogateMap = []Utf8Map{
{0xd800, "\xed\xa0\x80"}, // surrogate min decodes to (RuneError, 1)
{0xdfff, "\xed\xbf\xbf"}, // surrogate max decodes to (RuneError, 1)
}
var testStrings = []string{
"",
"abcd",
"☺☻☹",
"日a本b語ç日ð本Ê語þ日¥本¼語i日©",
"日a本b語ç日ð本Ê語þ日¥本¼語i日©日a本b語ç日ð本Ê語þ日¥本¼語i日©日a本b語ç日ð本Ê語þ日¥本¼語i日©",
"\x80\x80\x80\x80",
}
func TestFullRune(t *testing.T) {
for _, m := range utf8map {
b := []byte(m.str)
if !FullRune(b) {
t.Errorf("FullRune(%q) (%U) = false, want true", b, m.r)
}
s := m.str
if !FullRuneInString(s) {
t.Errorf("FullRuneInString(%q) (%U) = false, want true", s, m.r)
}
b1 := b[0 : len(b)-1]
if FullRune(b1) {
t.Errorf("FullRune(%q) = true, want false", b1)
}
s1 := string(b1)
if FullRuneInString(s1) {
t.Errorf("FullRune(%q) = true, want false", s1)
}
}
for _, s := range []string{"\xc0", "\xc1"} {
b := []byte(s)
if !FullRune(b) {
t.Errorf("FullRune(%q) = false, want true", s)
}
if !FullRuneInString(s) {
t.Errorf("FullRuneInString(%q) = false, want true", s)
}
}
}
func TestEncodeRune(t *testing.T) {
for _, m := range utf8map {
b := []byte(m.str)
var buf [10]byte
n := EncodeRune(buf[0:], m.r)
b1 := buf[0:n]
if !bytes.Equal(b, b1) {
t.Errorf("EncodeRune(%#04x) = %q want %q", m.r, b1, b)
}
}
}
func TestDecodeRune(t *testing.T) {
for _, m := range utf8map {
b := []byte(m.str)
r, size := DecodeRune(b)
if r != m.r || size != len(b) {
t.Errorf("DecodeRune(%q) = %#04x, %d want %#04x, %d", b, r, size, m.r, len(b))
}
s := m.str
r, size = DecodeRuneInString(s)
if r != m.r || size != len(b) {
t.Errorf("DecodeRuneInString(%q) = %#04x, %d want %#04x, %d", s, r, size, m.r, len(b))
}
// there's an extra byte that bytes left behind - make sure trailing byte works
r, size = DecodeRune(b[0:cap(b)])
if r != m.r || size != len(b) {
t.Errorf("DecodeRune(%q) = %#04x, %d want %#04x, %d", b, r, size, m.r, len(b))
}
s = m.str + "\x00"
r, size = DecodeRuneInString(s)
if r != m.r || size != len(b) {
t.Errorf("DecodeRuneInString(%q) = %#04x, %d want %#04x, %d", s, r, size, m.r, len(b))
}
// make sure missing bytes fail
wantsize := 1
if wantsize >= len(b) {
wantsize = 0
}
r, size = DecodeRune(b[0 : len(b)-1])
if r != RuneError || size != wantsize {
t.Errorf("DecodeRune(%q) = %#04x, %d want %#04x, %d", b[0:len(b)-1], r, size, RuneError, wantsize)
}
s = m.str[0 : len(m.str)-1]
r, size = DecodeRuneInString(s)
if r != RuneError || size != wantsize {
t.Errorf("DecodeRuneInString(%q) = %#04x, %d want %#04x, %d", s, r, size, RuneError, wantsize)
}
// make sure bad sequences fail
if len(b) == 1 {
b[0] = 0x80
} else {
b[len(b)-1] = 0x7F
}
r, size = DecodeRune(b)
if r != RuneError || size != 1 {
t.Errorf("DecodeRune(%q) = %#04x, %d want %#04x, %d", b, r, size, RuneError, 1)
}
s = string(b)
r, size = DecodeRuneInString(s)
if r != RuneError || size != 1 {
t.Errorf("DecodeRuneInString(%q) = %#04x, %d want %#04x, %d", s, r, size, RuneError, 1)
}
}
}
func TestDecodeSurrogateRune(t *testing.T) {
for _, m := range surrogateMap {
b := []byte(m.str)
r, size := DecodeRune(b)
if r != RuneError || size != 1 {
t.Errorf("DecodeRune(%q) = %x, %d want %x, %d", b, r, size, RuneError, 1)
}
s := m.str
r, size = DecodeRuneInString(s)
if r != RuneError || size != 1 {
t.Errorf("DecodeRuneInString(%q) = %x, %d want %x, %d", b, r, size, RuneError, 1)
}
}
}
// Check that DecodeRune and DecodeLastRune correspond to
// the equivalent range loop.
func TestSequencing(t *testing.T) {
for _, ts := range testStrings {
for _, m := range utf8map {
for _, s := range []string{ts + m.str, m.str + ts, ts + m.str + ts} {
testSequence(t, s)
}
}
}
}
func runtimeRuneCount(s string) int {
return len([]rune(s)) // Replaced by gc with call to runtime.countrunes(s).
}
// Check that a range loop, len([]rune(string)) optimization and
// []rune conversions visit the same runes.
// Not really a test of this package, but the assumption is used here and
// it's good to verify.
func TestRuntimeConversion(t *testing.T) {
for _, ts := range testStrings {
count := RuneCountInString(ts)
if n := runtimeRuneCount(ts); n != count {
t.Errorf("%q: len([]rune()) counted %d runes; got %d from RuneCountInString", ts, n, count)
break
}
runes := []rune(ts)
if n := len(runes); n != count {
t.Errorf("%q: []rune() has length %d; got %d from RuneCountInString", ts, n, count)
break
}
i := 0
for _, r := range ts {
if r != runes[i] {
t.Errorf("%q[%d]: expected %c (%U); got %c (%U)", ts, i, runes[i], runes[i], r, r)
}
i++
}
}
}
var invalidSequenceTests = []string{
"\xed\xa0\x80\x80", // surrogate min
"\xed\xbf\xbf\x80", // surrogate max
// xx
"\x91\x80\x80\x80",
// s1
"\xC2\x7F\x80\x80",
"\xC2\xC0\x80\x80",
"\xDF\x7F\x80\x80",
"\xDF\xC0\x80\x80",
// s2
"\xE0\x9F\xBF\x80",
"\xE0\xA0\x7F\x80",
"\xE0\xBF\xC0\x80",
"\xE0\xC0\x80\x80",
// s3
"\xE1\x7F\xBF\x80",
"\xE1\x80\x7F\x80",
"\xE1\xBF\xC0\x80",
"\xE1\xC0\x80\x80",
//s4
"\xED\x7F\xBF\x80",
"\xED\x80\x7F\x80",
"\xED\x9F\xC0\x80",
"\xED\xA0\x80\x80",
// s5
"\xF0\x8F\xBF\xBF",
"\xF0\x90\x7F\xBF",
"\xF0\x90\x80\x7F",
"\xF0\xBF\xBF\xC0",
"\xF0\xBF\xC0\x80",
"\xF0\xC0\x80\x80",
// s6
"\xF1\x7F\xBF\xBF",
"\xF1\x80\x7F\xBF",
"\xF1\x80\x80\x7F",
"\xF1\xBF\xBF\xC0",
"\xF1\xBF\xC0\x80",
"\xF1\xC0\x80\x80",
// s7
"\xF4\x7F\xBF\xBF",
"\xF4\x80\x7F\xBF",
"\xF4\x80\x80\x7F",
"\xF4\x8F\xBF\xC0",
"\xF4\x8F\xC0\x80",
"\xF4\x90\x80\x80",
}
func runtimeDecodeRune(s string) rune {
for _, r := range s {
return r
}
return -1
}
func TestDecodeInvalidSequence(t *testing.T) {
for _, s := range invalidSequenceTests {
r1, _ := DecodeRune([]byte(s))
if want := RuneError; r1 != want {
t.Errorf("DecodeRune(%#x) = %#04x, want %#04x", s, r1, want)
return
}
r2, _ := DecodeRuneInString(s)
if want := RuneError; r2 != want {
t.Errorf("DecodeRuneInString(%q) = %#04x, want %#04x", s, r2, want)
return
}
if r1 != r2 {
t.Errorf("DecodeRune(%#x) = %#04x mismatch with DecodeRuneInString(%q) = %#04x", s, r1, s, r2)
return
}
r3 := runtimeDecodeRune(s)
if r2 != r3 {
t.Errorf("DecodeRuneInString(%q) = %#04x mismatch with runtime.decoderune(%q) = %#04x", s, r2, s, r3)
return
}
}
}
func testSequence(t *testing.T, s string) {
type info struct {
index int
r rune
}
index := make([]info, len(s))
b := []byte(s)
si := 0
j := 0
for i, r := range s {
if si != i {
t.Errorf("Sequence(%q) mismatched index %d, want %d", s, si, i)
return
}
index[j] = info{i, r}
j++
r1, size1 := DecodeRune(b[i:])
if r != r1 {
t.Errorf("DecodeRune(%q) = %#04x, want %#04x", s[i:], r1, r)
return
}
r2, size2 := DecodeRuneInString(s[i:])
if r != r2 {
t.Errorf("DecodeRuneInString(%q) = %#04x, want %#04x", s[i:], r2, r)
return
}
if size1 != size2 {
t.Errorf("DecodeRune/DecodeRuneInString(%q) size mismatch %d/%d", s[i:], size1, size2)
return
}
si += size1
}
j--
for si = len(s); si > 0; {
r1, size1 := DecodeLastRune(b[0:si])
r2, size2 := DecodeLastRuneInString(s[0:si])
if size1 != size2 {
t.Errorf("DecodeLastRune/DecodeLastRuneInString(%q, %d) size mismatch %d/%d", s, si, size1, size2)
return
}
if r1 != index[j].r {
t.Errorf("DecodeLastRune(%q, %d) = %#04x, want %#04x", s, si, r1, index[j].r)
return
}
if r2 != index[j].r {
t.Errorf("DecodeLastRuneInString(%q, %d) = %#04x, want %#04x", s, si, r2, index[j].r)
return
}
si -= size1
if si != index[j].index {
t.Errorf("DecodeLastRune(%q) index mismatch at %d, want %d", s, si, index[j].index)
return
}
j--
}
if si != 0 {
t.Errorf("DecodeLastRune(%q) finished at %d, not 0", s, si)
}
}
// Check that negative runes encode as U+FFFD.
func TestNegativeRune(t *testing.T) {
errorbuf := make([]byte, UTFMax)
errorbuf = errorbuf[0:EncodeRune(errorbuf, RuneError)]
buf := make([]byte, UTFMax)
buf = buf[0:EncodeRune(buf, -1)]
if !bytes.Equal(buf, errorbuf) {
t.Errorf("incorrect encoding [% x] for -1; expected [% x]", buf, errorbuf)
}
}
type RuneCountTest struct {
in string
out int
}
var runecounttests = []RuneCountTest{
{"abcd", 4},
{"☺☻☹", 3},
{"1,2,3,4", 7},
{"\xe2\x00", 2},
{"\xe2\x80", 2},
{"a\xe2\x80", 3},
}
func TestRuneCount(t *testing.T) {
for _, tt := range runecounttests {
if out := RuneCountInString(tt.in); out != tt.out {
t.Errorf("RuneCountInString(%q) = %d, want %d", tt.in, out, tt.out)
}
if out := RuneCount([]byte(tt.in)); out != tt.out {
t.Errorf("RuneCount(%q) = %d, want %d", tt.in, out, tt.out)
}
}
}
type RuneLenTest struct {
r rune
size int
}
var runelentests = []RuneLenTest{
{0, 1},
{'e', 1},
{'é', 2},
{'☺', 3},
{RuneError, 3},
{MaxRune, 4},
{0xD800, -1},
{0xDFFF, -1},
{MaxRune + 1, -1},
{-1, -1},
}
func TestRuneLen(t *testing.T) {
for _, tt := range runelentests {
if size := RuneLen(tt.r); size != tt.size {
t.Errorf("RuneLen(%#U) = %d, want %d", tt.r, size, tt.size)
}
}
}
type ValidTest struct {
in string
out bool
}
var validTests = []ValidTest{
{"", true},
{"a", true},
{"abc", true},
{"Ж", true},
{"ЖЖ", true},
{"брэд-ЛГТМ", true},
{"☺☻☹", true},
{"aa\xe2", false},
{string([]byte{66, 250}), false},
{string([]byte{66, 250, 67}), false},
{"a\uFFFDb", true},
{string("\xF4\x8F\xBF\xBF"), true}, // U+10FFFF
{string("\xF4\x90\x80\x80"), false}, // U+10FFFF+1; out of range
{string("\xF7\xBF\xBF\xBF"), false}, // 0x1FFFFF; out of range
{string("\xFB\xBF\xBF\xBF\xBF"), false}, // 0x3FFFFFF; out of range
{string("\xc0\x80"), false}, // U+0000 encoded in two bytes: incorrect
{string("\xed\xa0\x80"), false}, // U+D800 high surrogate (sic)
{string("\xed\xbf\xbf"), false}, // U+DFFF low surrogate (sic)
}
func TestValid(t *testing.T) {
for _, tt := range validTests {
if Valid([]byte(tt.in)) != tt.out {
t.Errorf("Valid(%q) = %v; want %v", tt.in, !tt.out, tt.out)
}
if ValidString(tt.in) != tt.out {
t.Errorf("ValidString(%q) = %v; want %v", tt.in, !tt.out, tt.out)
}
}
}
type ValidRuneTest struct {
r rune
ok bool
}
var validrunetests = []ValidRuneTest{
{0, true},
{'e', true},
{'é', true},
{'☺', true},
{RuneError, true},
{MaxRune, true},
{0xD7FF, true},
{0xD800, false},
{0xDFFF, false},
{0xE000, true},
{MaxRune + 1, false},
{-1, false},
}
func TestValidRune(t *testing.T) {
for _, tt := range validrunetests {
if ok := ValidRune(tt.r); ok != tt.ok {
t.Errorf("ValidRune(%#U) = %t, want %t", tt.r, ok, tt.ok)
}
}
}
func BenchmarkRuneCountTenASCIIChars(b *testing.B) {
s := []byte("0123456789")
for i := 0; i < b.N; i++ {
RuneCount(s)
}
}
func BenchmarkRuneCountTenJapaneseChars(b *testing.B) {
s := []byte("日本語日本語日本語日")
for i := 0; i < b.N; i++ {
RuneCount(s)
}
}
func BenchmarkRuneCountInStringTenASCIIChars(b *testing.B) {
for i := 0; i < b.N; i++ {
RuneCountInString("0123456789")
}
}
func BenchmarkRuneCountInStringTenJapaneseChars(b *testing.B) {
for i := 0; i < b.N; i++ {
RuneCountInString("日本語日本語日本語日")
}
}
func BenchmarkValidTenASCIIChars(b *testing.B) {
s := []byte("0123456789")
for i := 0; i < b.N; i++ {
Valid(s)
}
}
func BenchmarkValidTenJapaneseChars(b *testing.B) {
s := []byte("日本語日本語日本語日")
for i := 0; i < b.N; i++ {
Valid(s)
}
}
func BenchmarkValidStringTenASCIIChars(b *testing.B) {
for i := 0; i < b.N; i++ {
ValidString("0123456789")
}
}
func BenchmarkValidStringTenJapaneseChars(b *testing.B) {
for i := 0; i < b.N; i++ {
ValidString("日本語日本語日本語日")
}
}
func BenchmarkEncodeASCIIRune(b *testing.B) {
buf := make([]byte, UTFMax)
for i := 0; i < b.N; i++ {
EncodeRune(buf, 'a')
}
}
func BenchmarkEncodeJapaneseRune(b *testing.B) {
buf := make([]byte, UTFMax)
for i := 0; i < b.N; i++ {
EncodeRune(buf, '本')
}
}
func BenchmarkDecodeASCIIRune(b *testing.B) {
a := []byte{'a'}
for i := 0; i < b.N; i++ {
DecodeRune(a)
}
}
func BenchmarkDecodeJapaneseRune(b *testing.B) {
nihon := []byte("本")
for i := 0; i < b.N; i++ {
DecodeRune(nihon)
}
}
func BenchmarkFullASCIIRune(b *testing.B) {
a := []byte{'a'}
for i := 0; i < b.N; i++ {
FullRune(a)
}
}
func BenchmarkFullJapaneseRune(b *testing.B) {
nihon := []byte("本")
for i := 0; i < b.N; i++ {
FullRune(nihon)
}
}