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// Copyright 2010 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 utf16_test
import (
"internal/testenv"
"reflect"
"testing"
"unicode"
. "unicode/utf16"
)
// Validate the constants redefined from unicode.
func TestConstants(t *testing.T) {
if MaxRune != unicode.MaxRune {
t.Errorf("utf16.maxRune is wrong: %x should be %x", MaxRune, unicode.MaxRune)
}
if ReplacementChar != unicode.ReplacementChar {
t.Errorf("utf16.replacementChar is wrong: %x should be %x", ReplacementChar, unicode.ReplacementChar)
}
}
type encodeTest struct {
in []rune
out []uint16
}
var encodeTests = []encodeTest{
{[]rune{1, 2, 3, 4}, []uint16{1, 2, 3, 4}},
{[]rune{0xffff, 0x10000, 0x10001, 0x12345, 0x10ffff},
[]uint16{0xffff, 0xd800, 0xdc00, 0xd800, 0xdc01, 0xd808, 0xdf45, 0xdbff, 0xdfff}},
{[]rune{'a', 'b', 0xd7ff, 0xd800, 0xdfff, 0xe000, 0x110000, -1},
[]uint16{'a', 'b', 0xd7ff, 0xfffd, 0xfffd, 0xe000, 0xfffd, 0xfffd}},
}
func TestEncode(t *testing.T) {
for _, tt := range encodeTests {
out := Encode(tt.in)
if !reflect.DeepEqual(out, tt.out) {
t.Errorf("Encode(%x) = %x; want %x", tt.in, out, tt.out)
}
}
}
func TestAppendRune(t *testing.T) {
for _, tt := range encodeTests {
var out []uint16
for _, u := range tt.in {
out = AppendRune(out, u)
}
if !reflect.DeepEqual(out, tt.out) {
t.Errorf("AppendRune(%x) = %x; want %x", tt.in, out, tt.out)
}
}
}
func TestEncodeRune(t *testing.T) {
for i, tt := range encodeTests {
j := 0
for _, r := range tt.in {
r1, r2 := EncodeRune(r)
if r < 0x10000 || r > unicode.MaxRune {
if j >= len(tt.out) {
t.Errorf("#%d: ran out of tt.out", i)
break
}
if r1 != unicode.ReplacementChar || r2 != unicode.ReplacementChar {
t.Errorf("EncodeRune(%#x) = %#x, %#x; want 0xfffd, 0xfffd", r, r1, r2)
}
j++
} else {
if j+1 >= len(tt.out) {
t.Errorf("#%d: ran out of tt.out", i)
break
}
if r1 != rune(tt.out[j]) || r2 != rune(tt.out[j+1]) {
t.Errorf("EncodeRune(%#x) = %#x, %#x; want %#x, %#x", r, r1, r2, tt.out[j], tt.out[j+1])
}
j += 2
dec := DecodeRune(r1, r2)
if dec != r {
t.Errorf("DecodeRune(%#x, %#x) = %#x; want %#x", r1, r2, dec, r)
}
}
}
if j != len(tt.out) {
t.Errorf("#%d: EncodeRune didn't generate enough output", i)
}
}
}
type decodeTest struct {
in []uint16
out []rune
}
var decodeTests = []decodeTest{
{[]uint16{1, 2, 3, 4}, []rune{1, 2, 3, 4}},
{[]uint16{0xffff, 0xd800, 0xdc00, 0xd800, 0xdc01, 0xd808, 0xdf45, 0xdbff, 0xdfff},
[]rune{0xffff, 0x10000, 0x10001, 0x12345, 0x10ffff}},
{[]uint16{0xd800, 'a'}, []rune{0xfffd, 'a'}},
{[]uint16{0xdfff}, []rune{0xfffd}},
}
func TestAllocationsDecode(t *testing.T) {
testenv.SkipIfOptimizationOff(t)
for _, tt := range decodeTests {
allocs := testing.AllocsPerRun(10, func() {
out := Decode(tt.in)
if out == nil {
t.Errorf("Decode(%x) = nil", tt.in)
}
})
if allocs > 0 {
t.Errorf("Decode allocated %v times", allocs)
}
}
}
func TestDecode(t *testing.T) {
for _, tt := range decodeTests {
out := Decode(tt.in)
if !reflect.DeepEqual(out, tt.out) {
t.Errorf("Decode(%x) = %x; want %x", tt.in, out, tt.out)
}
}
}
var decodeRuneTests = []struct {
r1, r2 rune
want rune
}{
{0xd800, 0xdc00, 0x10000},
{0xd800, 0xdc01, 0x10001},
{0xd808, 0xdf45, 0x12345},
{0xdbff, 0xdfff, 0x10ffff},
{0xd800, 'a', 0xfffd}, // illegal, replacement rune substituted
}
func TestDecodeRune(t *testing.T) {
for i, tt := range decodeRuneTests {
got := DecodeRune(tt.r1, tt.r2)
if got != tt.want {
t.Errorf("%d: DecodeRune(%q, %q) = %v; want %v", i, tt.r1, tt.r2, got, tt.want)
}
}
}
var surrogateTests = []struct {
r rune
want bool
}{
// from https://en.wikipedia.org/wiki/UTF-16
{'\u007A', false}, // LATIN SMALL LETTER Z
{'\u6C34', false}, // CJK UNIFIED IDEOGRAPH-6C34 (water)
{'\uFEFF', false}, // Byte Order Mark
{'\U00010000', false}, // LINEAR B SYLLABLE B008 A (first non-BMP code point)
{'\U0001D11E', false}, // MUSICAL SYMBOL G CLEF
{'\U0010FFFD', false}, // PRIVATE USE CHARACTER-10FFFD (last Unicode code point)
{rune(0xd7ff), false}, // surr1-1
{rune(0xd800), true}, // surr1
{rune(0xdc00), true}, // surr2
{rune(0xe000), false}, // surr3
{rune(0xdfff), true}, // surr3-1
}
func TestIsSurrogate(t *testing.T) {
for i, tt := range surrogateTests {
got := IsSurrogate(tt.r)
if got != tt.want {
t.Errorf("%d: IsSurrogate(%q) = %v; want %v", i, tt.r, got, tt.want)
}
}
}
func BenchmarkDecodeValidASCII(b *testing.B) {
// "hello world"
data := []uint16{104, 101, 108, 108, 111, 32, 119, 111, 114, 108, 100}
for i := 0; i < b.N; i++ {
Decode(data)
}
}
func BenchmarkDecodeValidJapaneseChars(b *testing.B) {
// "日本語日本語日本語"
data := []uint16{26085, 26412, 35486, 26085, 26412, 35486, 26085, 26412, 35486}
for i := 0; i < b.N; i++ {
Decode(data)
}
}
func BenchmarkDecodeRune(b *testing.B) {
rs := make([]rune, 10)
// U+1D4D0 to U+1D4D4: MATHEMATICAL BOLD SCRIPT CAPITAL LETTERS
for i, u := range []rune{'𝓐', '𝓑', '𝓒', '𝓓', '𝓔'} {
rs[2*i], rs[2*i+1] = EncodeRune(u)
}
b.ResetTimer()
for i := 0; i < b.N; i++ {
for j := 0; j < 5; j++ {
DecodeRune(rs[2*j], rs[2*j+1])
}
}
}
func BenchmarkEncodeValidASCII(b *testing.B) {
data := []rune{'h', 'e', 'l', 'l', 'o'}
for i := 0; i < b.N; i++ {
Encode(data)
}
}
func BenchmarkEncodeValidJapaneseChars(b *testing.B) {
data := []rune{'日', '本', '語'}
for i := 0; i < b.N; i++ {
Encode(data)
}
}
func BenchmarkAppendRuneValidASCII(b *testing.B) {
data := []rune{'h', 'e', 'l', 'l', 'o'}
a := make([]uint16, 0, len(data)*2)
for i := 0; i < b.N; i++ {
for _, u := range data {
a = AppendRune(a, u)
}
a = a[:0]
}
}
func BenchmarkAppendRuneValidJapaneseChars(b *testing.B) {
data := []rune{'日', '本', '語'}
a := make([]uint16, 0, len(data)*2)
for i := 0; i < b.N; i++ {
for _, u := range data {
a = AppendRune(a, u)
}
a = a[:0]
}
}
func BenchmarkEncodeRune(b *testing.B) {
for i := 0; i < b.N; i++ {
for _, u := range []rune{'𝓐', '𝓑', '𝓒', '𝓓', '𝓔'} {
EncodeRune(u)
}
}
}
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