// 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 bytes_test
import (
. "bytes"
"fmt"
"internal/testenv"
"math/rand"
"reflect"
"strings"
"testing"
"unicode"
"unicode/utf8"
)
func eq(a, b []string) bool {
if len(a) != len(b) {
return false
}
for i := 0; i < len(a); i++ {
if a[i] != b[i] {
return false
}
}
return true
}
func sliceOfString(s [][]byte) []string {
result := make([]string, len(s))
for i, v := range s {
result[i] = string(v)
}
return result
}
// For ease of reading, the test cases use strings that are converted to byte
// slices before invoking the functions.
var abcd = "abcd"
var faces = "☺☻☹"
var commas = "1,2,3,4"
var dots = "1....2....3....4"
type BinOpTest struct {
a string
b string
i int
}
func TestEqual(t *testing.T) {
for _, tt := range compareTests {
eql := Equal(tt.a, tt.b)
if eql != (tt.i == 0) {
t.Errorf(`Equal(%q, %q) = %v`, tt.a, tt.b, eql)
}
eql = EqualPortable(tt.a, tt.b)
if eql != (tt.i == 0) {
t.Errorf(`EqualPortable(%q, %q) = %v`, tt.a, tt.b, eql)
}
}
}
func TestEqualExhaustive(t *testing.T) {
var size = 128
if testing.Short() {
size = 32
}
a := make([]byte, size)
b := make([]byte, size)
b_init := make([]byte, size)
// randomish but deterministic data
for i := 0; i < size; i++ {
a[i] = byte(17 * i)
b_init[i] = byte(23*i + 100)
}
for len := 0; len <= size; len++ {
for x := 0; x <= size-len; x++ {
for y := 0; y <= size-len; y++ {
copy(b, b_init)
copy(b[y:y+len], a[x:x+len])
if !Equal(a[x:x+len], b[y:y+len]) || !Equal(b[y:y+len], a[x:x+len]) {
t.Errorf("Equal(%d, %d, %d) = false", len, x, y)
}
}
}
}
}
// make sure Equal returns false for minimally different strings. The data
// is all zeros except for a single one in one location.
func TestNotEqual(t *testing.T) {
var size = 128
if testing.Short() {
size = 32
}
a := make([]byte, size)
b := make([]byte, size)
for len := 0; len <= size; len++ {
for x := 0; x <= size-len; x++ {
for y := 0; y <= size-len; y++ {
for diffpos := x; diffpos < x+len; diffpos++ {
a[diffpos] = 1
if Equal(a[x:x+len], b[y:y+len]) || Equal(b[y:y+len], a[x:x+len]) {
t.Errorf("NotEqual(%d, %d, %d, %d) = true", len, x, y, diffpos)
}
a[diffpos] = 0
}
}
}
}
}
var indexTests = []BinOpTest{
{"", "", 0},
{"", "a", -1},
{"", "foo", -1},
{"fo", "foo", -1},
{"foo", "baz", -1},
{"foo", "foo", 0},
{"oofofoofooo", "f", 2},
{"oofofoofooo", "foo", 4},
{"barfoobarfoo", "foo", 3},
{"foo", "", 0},
{"foo", "o", 1},
{"abcABCabc", "A", 3},
// cases with one byte strings - test IndexByte and special case in Index()
{"", "a", -1},
{"x", "a", -1},
{"x", "x", 0},
{"abc", "a", 0},
{"abc", "b", 1},
{"abc", "c", 2},
{"abc", "x", -1},
{"barfoobarfooyyyzzzyyyzzzyyyzzzyyyxxxzzzyyy", "x", 33},
{"foofyfoobarfoobar", "y", 4},
{"oooooooooooooooooooooo", "r", -1},
}
var lastIndexTests = []BinOpTest{
{"", "", 0},
{"", "a", -1},
{"", "foo", -1},
{"fo", "foo", -1},
{"foo", "foo", 0},
{"foo", "f", 0},
{"oofofoofooo", "f", 7},
{"oofofoofooo", "foo", 7},
{"barfoobarfoo", "foo", 9},
{"foo", "", 3},
{"foo", "o", 2},
{"abcABCabc", "A", 3},
{"abcABCabc", "a", 6},
}
var indexAnyTests = []BinOpTest{
{"", "", -1},
{"", "a", -1},
{"", "abc", -1},
{"a", "", -1},
{"a", "a", 0},
{"aaa", "a", 0},
{"abc", "xyz", -1},
{"abc", "xcz", 2},
{"ab☺c", "x☺yz", 2},
{"a☺b☻c☹d", "cx", len("a☺b☻")},
{"a☺b☻c☹d", "uvw☻xyz", len("a☺b")},
{"aRegExp*", ".(|)*+?^$[]", 7},
{dots + dots + dots, " ", -1},
{"012abcba210", "\xffb", 4},
{"012\x80bcb\x80210", "\xffb", 3},
}
var lastIndexAnyTests = []BinOpTest{
{"", "", -1},
{"", "a", -1},
{"", "abc", -1},
{"a", "", -1},
{"a", "a", 0},
{"aaa", "a", 2},
{"abc", "xyz", -1},
{"abc", "ab", 1},
{"ab☺c", "x☺yz", 2},
{"a☺b☻c☹d", "cx", len("a☺b☻")},
{"a☺b☻c☹d", "uvw☻xyz", len("a☺b")},
{"a.RegExp*", ".(|)*+?^$[]", 8},
{dots + dots + dots, " ", -1},
{"012abcba210", "\xffb", 6},
{"012\x80bcb\x80210", "\xffb", 7},
}
// Execute f on each test case. funcName should be the name of f; it's used
// in failure reports.
func runIndexTests(t *testing.T, f func(s, sep []byte) int, funcName string, testCases []BinOpTest) {
for _, test := range testCases {
a := []byte(test.a)
b := []byte(test.b)
actual := f(a, b)
if actual != test.i {
t.Errorf("%s(%q,%q) = %v; want %v", funcName, a, b, actual, test.i)
}
}
}
func runIndexAnyTests(t *testing.T, f func(s []byte, chars string) int, funcName string, testCases []BinOpTest) {
for _, test := range testCases {
a := []byte(test.a)
actual := f(a, test.b)
if actual != test.i {
t.Errorf("%s(%q,%q) = %v; want %v", funcName, a, test.b, actual, test.i)
}
}
}
func TestIndex(t *testing.T) { runIndexTests(t, Index, "Index", indexTests) }
func TestLastIndex(t *testing.T) { runIndexTests(t, LastIndex, "LastIndex", lastIndexTests) }
func TestIndexAny(t *testing.T) { runIndexAnyTests(t, IndexAny, "IndexAny", indexAnyTests) }
func TestLastIndexAny(t *testing.T) {
runIndexAnyTests(t, LastIndexAny, "LastIndexAny", lastIndexAnyTests)
}
func TestIndexByte(t *testing.T) {
for _, tt := range indexTests {
if len(tt.b) != 1 {
continue
}
a := []byte(tt.a)
b := tt.b[0]
pos := IndexByte(a, b)
if pos != tt.i {
t.Errorf(`IndexByte(%q, '%c') = %v`, tt.a, b, pos)
}
posp := IndexBytePortable(a, b)
if posp != tt.i {
t.Errorf(`indexBytePortable(%q, '%c') = %v`, tt.a, b, posp)
}
}
}
func TestLastIndexByte(t *testing.T) {
testCases := []BinOpTest{
{"", "q", -1},
{"abcdef", "q", -1},
{"abcdefabcdef", "a", len("abcdef")}, // something in the middle
{"abcdefabcdef", "f", len("abcdefabcde")}, // last byte
{"zabcdefabcdef", "z", 0}, // first byte
{"a☺b☻c☹d", "b", len("a☺")}, // non-ascii
}
for _, test := range testCases {
actual := LastIndexByte([]byte(test.a), test.b[0])
if actual != test.i {
t.Errorf("LastIndexByte(%q,%c) = %v; want %v", test.a, test.b[0], actual, test.i)
}
}
}
// test a larger buffer with different sizes and alignments
func TestIndexByteBig(t *testing.T) {
var n = 1024
if testing.Short() {
n = 128
}
b := make([]byte, n)
for i := 0; i < n; i++ {
// different start alignments
b1 := b[i:]
for j := 0; j < len(b1); j++ {
b1[j] = 'x'
pos := IndexByte(b1, 'x')
if pos != j {
t.Errorf("IndexByte(%q, 'x') = %v", b1, pos)
}
b1[j] = 0
pos = IndexByte(b1, 'x')
if pos != -1 {
t.Errorf("IndexByte(%q, 'x') = %v", b1, pos)
}
}
// different end alignments
b1 = b[:i]
for j := 0; j < len(b1); j++ {
b1[j] = 'x'
pos := IndexByte(b1, 'x')
if pos != j {
t.Errorf("IndexByte(%q, 'x') = %v", b1, pos)
}
b1[j] = 0
pos = IndexByte(b1, 'x')
if pos != -1 {
t.Errorf("IndexByte(%q, 'x') = %v", b1, pos)
}
}
// different start and end alignments
b1 = b[i/2 : n-(i+1)/2]
for j := 0; j < len(b1); j++ {
b1[j] = 'x'
pos := IndexByte(b1, 'x')
if pos != j {
t.Errorf("IndexByte(%q, 'x') = %v", b1, pos)
}
b1[j] = 0
pos = IndexByte(b1, 'x')
if pos != -1 {
t.Errorf("IndexByte(%q, 'x') = %v", b1, pos)
}
}
}
}
// test a small index across all page offsets
func TestIndexByteSmall(t *testing.T) {
b := make([]byte, 5015) // bigger than a page
// Make sure we find the correct byte even when straddling a page.
for i := 0; i <= len(b)-15; i++ {
for j := 0; j < 15; j++ {
b[i+j] = byte(100 + j)
}
for j := 0; j < 15; j++ {
p := IndexByte(b[i:i+15], byte(100+j))
if p != j {
t.Errorf("IndexByte(%q, %d) = %d", b[i:i+15], 100+j, p)
}
}
for j := 0; j < 15; j++ {
b[i+j] = 0
}
}
// Make sure matches outside the slice never trigger.
for i := 0; i <= len(b)-15; i++ {
for j := 0; j < 15; j++ {
b[i+j] = 1
}
for j := 0; j < 15; j++ {
p := IndexByte(b[i:i+15], byte(0))
if p != -1 {
t.Errorf("IndexByte(%q, %d) = %d", b[i:i+15], 0, p)
}
}
for j := 0; j < 15; j++ {
b[i+j] = 0
}
}
}
func TestIndexRune(t *testing.T) {
tests := []struct {
in string
rune rune
want int
}{
{"", 'a', -1},
{"", '☺', -1},
{"foo", '☹', -1},
{"foo", 'o', 1},
{"foo☺bar", '☺', 3},
{"foo☺☻☹bar", '☹', 9},
{"a A x", 'A', 2},
{"some_text=some_value", '=', 9},
{"☺a", 'a', 3},
{"a☻☺b", '☺', 4},
// RuneError should match any invalid UTF-8 byte sequence.
{"�", '�', 0},
{"\xff", '�', 0},
{"☻x�", '�', len("☻x")},
{"☻x\xe2\x98", '�', len("☻x")},
{"☻x\xe2\x98�", '�', len("☻x")},
{"☻x\xe2\x98x", '�', len("☻x")},
// Invalid rune values should never match.
{"a☺b☻c☹d\xe2\x98�\xff�\xed\xa0\x80", -1, -1},
{"a☺b☻c☹d\xe2\x98�\xff�\xed\xa0\x80", 0xD800, -1}, // Surrogate pair
{"a☺b☻c☹d\xe2\x98�\xff�\xed\xa0\x80", utf8.MaxRune + 1, -1},
}
for _, tt := range tests {
if got := IndexRune([]byte(tt.in), tt.rune); got != tt.want {
t.Errorf("IndexRune(%q, %d) = %v; want %v", tt.in, tt.rune, got, tt.want)
}
}
haystack := []byte("test世界")
allocs := testing.AllocsPerRun(1000, func() {
if i := IndexRune(haystack, 's'); i != 2 {
t.Fatalf("'s' at %d; want 2", i)
}
if i := IndexRune(haystack, '世'); i != 4 {
t.Fatalf("'世' at %d; want 4", i)
}
})
if allocs != 0 {
t.Errorf("expected no allocations, got %f", allocs)
}
}
var bmbuf []byte
func valName(x int) string {
if s := x >> 20; s<<20 == x {
return fmt.Sprintf("%dM", s)
}
if s := x >> 10; s<<10 == x {
return fmt.Sprintf("%dK", s)
}
return fmt.Sprint(x)
}
func benchBytes(b *testing.B, sizes []int, f func(b *testing.B, n int)) {
for _, n := range sizes {
if isRaceBuilder && n > 4<<10 {
continue
}
b.Run(valName(n), func(b *testing.B) {
if len(bmbuf) < n {
bmbuf = make([]byte, n)
}
b.SetBytes(int64(n))
f(b, n)
})
}
}
var indexSizes = []int{10, 32, 4 << 10, 4 << 20, 64 << 20}
var isRaceBuilder = strings.HasSuffix(testenv.Builder(), "-race")
func BenchmarkIndexByte(b *testing.B) {
benchBytes(b, indexSizes, bmIndexByte(IndexByte))
}
func BenchmarkIndexBytePortable(b *testing.B) {
benchBytes(b, indexSizes, bmIndexByte(IndexBytePortable))
}
func bmIndexByte(index func([]byte, byte) int) func(b *testing.B, n int) {
return func(b *testing.B, n int) {
buf := bmbuf[0:n]
buf[n-1] = 'x'
for i := 0; i < b.N; i++ {
j := index(buf, 'x')
if j != n-1 {
b.Fatal("bad index", j)
}
}
buf[n-1] = '\x00'
}
}
func BenchmarkIndexRune(b *testing.B) {
benchBytes(b, indexSizes, bmIndexRune(IndexRune))
}
func BenchmarkIndexRuneASCII(b *testing.B) {
benchBytes(b, indexSizes, bmIndexRuneASCII(IndexRune))
}
func bmIndexRuneASCII(index func([]byte, rune) int) func(b *testing.B, n int) {
return func(b *testing.B, n int) {
buf := bmbuf[0:n]
buf[n-1] = 'x'
for i := 0; i < b.N; i++ {
j := index(buf, 'x')
if j != n-1 {
b.Fatal("bad index", j)
}
}
buf[n-1] = '\x00'
}
}
func bmIndexRune(index func([]byte, rune) int) func(b *testing.B, n int) {
return func(b *testing.B, n int) {
buf := bmbuf[0:n]
utf8.EncodeRune(buf[n-3:], '世')
for i := 0; i < b.N; i++ {
j := index(buf, '世')
if j != n-3 {
b.Fatal("bad index", j)
}
}
buf[n-3] = '\x00'
buf[n-2] = '\x00'
buf[n-1] = '\x00'
}
}
func BenchmarkEqual(b *testing.B) {
b.Run("0", func(b *testing.B) {
var buf [4]byte
buf1 := buf[0:0]
buf2 := buf[1:1]
for i := 0; i < b.N; i++ {
eq := Equal(buf1, buf2)
if !eq {
b.Fatal("bad equal")
}
}
})
sizes := []int{1, 6, 9, 15, 16, 20, 32, 4 << 10, 4 << 20, 64 << 20}
benchBytes(b, sizes, bmEqual(Equal))
}
func BenchmarkEqualPort(b *testing.B) {
sizes := []int{1, 6, 32, 4 << 10, 4 << 20, 64 << 20}
benchBytes(b, sizes, bmEqual(EqualPortable))
}
func bmEqual(equal func([]byte, []byte) bool) func(b *testing.B, n int) {
return func(b *testing.B, n int) {
if len(bmbuf) < 2*n {
bmbuf = make([]byte, 2*n)
}
buf1 := bmbuf[0:n]
buf2 := bmbuf[n : 2*n]
buf1[n-1] = 'x'
buf2[n-1] = 'x'
for i := 0; i < b.N; i++ {
eq := equal(buf1, buf2)
if !eq {
b.Fatal("bad equal")
}
}
buf1[n-1] = '\x00'
buf2[n-1] = '\x00'
}
}
func BenchmarkIndex(b *testing.B) {
benchBytes(b, indexSizes, func(b *testing.B, n int) {
buf := bmbuf[0:n]
buf[n-1] = 'x'
for i := 0; i < b.N; i++ {
j := Index(buf, buf[n-7:])
if j != n-7 {
b.Fatal("bad index", j)
}
}
buf[n-1] = '\x00'
})
}
func BenchmarkIndexEasy(b *testing.B) {
benchBytes(b, indexSizes, func(b *testing.B, n int) {
buf := bmbuf[0:n]
buf[n-1] = 'x'
buf[n-7] = 'x'
for i := 0; i < b.N; i++ {
j := Index(buf, buf[n-7:])
if j != n-7 {
b.Fatal("bad index", j)
}
}
buf[n-1] = '\x00'
buf[n-7] = '\x00'
})
}
func BenchmarkCount(b *testing.B) {
benchBytes(b, indexSizes, func(b *testing.B, n int) {
buf := bmbuf[0:n]
buf[n-1] = 'x'
for i := 0; i < b.N; i++ {
j := Count(buf, buf[n-7:])
if j != 1 {
b.Fatal("bad count", j)
}
}
buf[n-1] = '\x00'
})
}
func BenchmarkCountEasy(b *testing.B) {
benchBytes(b, indexSizes, func(b *testing.B, n int) {
buf := bmbuf[0:n]
buf[n-1] = 'x'
buf[n-7] = 'x'
for i := 0; i < b.N; i++ {
j := Count(buf, buf[n-7:])
if j != 1 {
b.Fatal("bad count", j)
}
}
buf[n-1] = '\x00'
buf[n-7] = '\x00'
})
}
type ExplodeTest struct {
s string
n int
a []string
}
var explodetests = []ExplodeTest{
{"", -1, []string{}},
{abcd, -1, []string{"a", "b", "c", "d"}},
{faces, -1, []string{"☺", "☻", "☹"}},
{abcd, 2, []string{"a", "bcd"}},
}
func TestExplode(t *testing.T) {
for _, tt := range explodetests {
a := SplitN([]byte(tt.s), nil, tt.n)
result := sliceOfString(a)
if !eq(result, tt.a) {
t.Errorf(`Explode("%s", %d) = %v; want %v`, tt.s, tt.n, result, tt.a)
continue
}
s := Join(a, []byte{})
if string(s) != tt.s {
t.Errorf(`Join(Explode("%s", %d), "") = "%s"`, tt.s, tt.n, s)
}
}
}
type SplitTest struct {
s string
sep string
n int
a []string
}
var splittests = []SplitTest{
{abcd, "a", 0, nil},
{abcd, "a", -1, []string{"", "bcd"}},
{abcd, "z", -1, []string{"abcd"}},
{abcd, "", -1, []string{"a", "b", "c", "d"}},
{commas, ",", -1, []string{"1", "2", "3", "4"}},
{dots, "...", -1, []string{"1", ".2", ".3", ".4"}},
{faces, "☹", -1, []string{"☺☻", ""}},
{faces, "~", -1, []string{faces}},
{faces, "", -1, []string{"☺", "☻", "☹"}},
{"1 2 3 4", " ", 3, []string{"1", "2", "3 4"}},
{"1 2", " ", 3, []string{"1", "2"}},
{"123", "", 2, []string{"1", "23"}},
{"123", "", 17, []string{"1", "2", "3"}},
}
func TestSplit(t *testing.T) {
for _, tt := range splittests {
a := SplitN([]byte(tt.s), []byte(tt.sep), tt.n)
result := sliceOfString(a)
if !eq(result, tt.a) {
t.Errorf(`Split(%q, %q, %d) = %v; want %v`, tt.s, tt.sep, tt.n, result, tt.a)
continue
}
if tt.n == 0 {
continue
}
s := Join(a, []byte(tt.sep))
if string(s) != tt.s {
t.Errorf(`Join(Split(%q, %q, %d), %q) = %q`, tt.s, tt.sep, tt.n, tt.sep, s)
}
if tt.n < 0 {
b := Split([]byte(tt.s), []byte(tt.sep))
if !reflect.DeepEqual(a, b) {
t.Errorf("Split disagrees withSplitN(%q, %q, %d) = %v; want %v", tt.s, tt.sep, tt.n, b, a)
}
}
if len(a) > 0 {
in, out := a[0], s
if cap(in) == cap(out) && &in[:1][0] == &out[:1][0] {
t.Errorf("Join(%#v, %q) didn't copy", a, tt.sep)
}
}
}
}
var splitaftertests = []SplitTest{
{abcd, "a", -1, []string{"a", "bcd"}},
{abcd, "z", -1, []string{"abcd"}},
{abcd, "", -1, []string{"a", "b", "c", "d"}},
{commas, ",", -1, []string{"1,", "2,", "3,", "4"}},
{dots, "...", -1, []string{"1...", ".2...", ".3...", ".4"}},
{faces, "☹", -1, []string{"☺☻☹", ""}},
{faces, "~", -1, []string{faces}},
{faces, "", -1, []string{"☺", "☻", "☹"}},
{"1 2 3 4", " ", 3, []string{"1 ", "2 ", "3 4"}},
{"1 2 3", " ", 3, []string{"1 ", "2 ", "3"}},
{"1 2", " ", 3, []string{"1 ", "2"}},
{"123", "", 2, []string{"1", "23"}},
{"123", "", 17, []string{"1", "2", "3"}},
}
func TestSplitAfter(t *testing.T) {
for _, tt := range splitaftertests {
a := SplitAfterN([]byte(tt.s), []byte(tt.sep), tt.n)
result := sliceOfString(a)
if !eq(result, tt.a) {
t.Errorf(`Split(%q, %q, %d) = %v; want %v`, tt.s, tt.sep, tt.n, result, tt.a)
continue
}
s := Join(a, nil)
if string(s) != tt.s {
t.Errorf(`Join(Split(%q, %q, %d), %q) = %q`, tt.s, tt.sep, tt.n, tt.sep, s)
}
if tt.n < 0 {
b := SplitAfter([]byte(tt.s), []byte(tt.sep))
if !reflect.DeepEqual(a, b) {
t.Errorf("SplitAfter disagrees withSplitAfterN(%q, %q, %d) = %v; want %v", tt.s, tt.sep, tt.n, b, a)
}
}
}
}
type FieldsTest struct {
s string
a []string
}
var fieldstests = []FieldsTest{
{"", []string{}},
{" ", []string{}},
{" \t ", []string{}},
{" abc ", []string{"abc"}},
{"1 2 3 4", []string{"1", "2", "3", "4"}},
{"1 2 3 4", []string{"1", "2", "3", "4"}},
{"1\t\t2\t\t3\t4", []string{"1", "2", "3", "4"}},
{"1\u20002\u20013\u20024", []string{"1", "2", "3", "4"}},
{"\u2000\u2001\u2002", []string{}},
{"\n™\t™\n", []string{"™", "™"}},
{faces, []string{faces}},
}
func TestFields(t *testing.T) {
for _, tt := range fieldstests {
a := Fields([]byte(tt.s))
result := sliceOfString(a)
if !eq(result, tt.a) {
t.Errorf("Fields(%q) = %v; want %v", tt.s, a, tt.a)
continue
}
}
}
func TestFieldsFunc(t *testing.T) {
for _, tt := range fieldstests {
a := FieldsFunc([]byte(tt.s), unicode.IsSpace)
result := sliceOfString(a)
if !eq(result, tt.a) {
t.Errorf("FieldsFunc(%q, unicode.IsSpace) = %v; want %v", tt.s, a, tt.a)
continue
}
}
pred := func(c rune) bool { return c == 'X' }
var fieldsFuncTests = []FieldsTest{
{"", []string{}},
{"XX", []string{}},
{"XXhiXXX", []string{"hi"}},
{"aXXbXXXcX", []string{"a", "b", "c"}},
}
for _, tt := range fieldsFuncTests {
a := FieldsFunc([]byte(tt.s), pred)
result := sliceOfString(a)
if !eq(result, tt.a) {
t.Errorf("FieldsFunc(%q) = %v, want %v", tt.s, a, tt.a)
}
}
}
// Test case for any function which accepts and returns a byte slice.
// For ease of creation, we write the byte slices as strings.
type StringTest struct {
in, out string
}
var upperTests = []StringTest{
{"", ""},
{"abc", "ABC"},
{"AbC123", "ABC123"},
{"azAZ09_", "AZAZ09_"},
{"\u0250\u0250\u0250\u0250\u0250", "\u2C6F\u2C6F\u2C6F\u2C6F\u2C6F"}, // grows one byte per char
}
var lowerTests = []StringTest{
{"", ""},
{"abc", "abc"},
{"AbC123", "abc123"},
{"azAZ09_", "azaz09_"},
{"\u2C6D\u2C6D\u2C6D\u2C6D\u2C6D", "\u0251\u0251\u0251\u0251\u0251"}, // shrinks one byte per char
}
const space = "\t\v\r\f\n\u0085\u00a0\u2000\u3000"
var trimSpaceTests = []StringTest{
{"", ""},
{"abc", "abc"},
{space + "abc" + space, "abc"},
{" ", ""},
{" \t\r\n \t\t\r\r\n\n ", ""},
{" \t\r\n x\t\t\r\r\n\n ", "x"},
{" \u2000\t\r\n x\t\t\r\r\ny\n \u3000", "x\t\t\r\r\ny"},
{"1 \t\r\n2", "1 \t\r\n2"},
{" x\x80", "x\x80"},
{" x\xc0", "x\xc0"},
{"x \xc0\xc0 ", "x \xc0\xc0"},
{"x \xc0", "x \xc0"},
{"x \xc0 ", "x \xc0"},
{"x \xc0\xc0 ", "x \xc0\xc0"},
{"x ☺\xc0\xc0 ", "x ☺\xc0\xc0"},
{"x ☺ ", "x ☺"},
}
// Execute f on each test case. funcName should be the name of f; it's used
// in failure reports.
func runStringTests(t *testing.T, f func([]byte) []byte, funcName string, testCases []StringTest) {
for _, tc := range testCases {
actual := string(f([]byte(tc.in)))
if actual != tc.out {
t.Errorf("%s(%q) = %q; want %q", funcName, tc.in, actual, tc.out)
}
}
}
func tenRunes(r rune) string {
runes := make([]rune, 10)
for i := range runes {
runes[i] = r
}
return string(runes)
}
// User-defined self-inverse mapping function
func rot13(r rune) rune {
const step = 13
if r >= 'a' && r <= 'z' {
return ((r - 'a' + step) % 26) + 'a'
}
if r >= 'A' && r <= 'Z' {
return ((r - 'A' + step) % 26) + 'A'
}
return r
}
func TestMap(t *testing.T) {
// Run a couple of awful growth/shrinkage tests
a := tenRunes('a')
// 1. Grow. This triggers two reallocations in Map.
maxRune := func(r rune) rune { return unicode.MaxRune }
m := Map(maxRune, []byte(a))
expect := tenRunes(unicode.MaxRune)
if string(m) != expect {
t.Errorf("growing: expected %q got %q", expect, m)
}
// 2. Shrink
minRune := func(r rune) rune { return 'a' }
m = Map(minRune, []byte(tenRunes(unicode.MaxRune)))
expect = a
if string(m) != expect {
t.Errorf("shrinking: expected %q got %q", expect, m)
}
// 3. Rot13
m = Map(rot13, []byte("a to zed"))
expect = "n gb mrq"
if string(m) != expect {
t.Errorf("rot13: expected %q got %q", expect, m)
}
// 4. Rot13^2
m = Map(rot13, Map(rot13, []byte("a to zed")))
expect = "a to zed"
if string(m) != expect {
t.Errorf("rot13: expected %q got %q", expect, m)
}
// 5. Drop
dropNotLatin := func(r rune) rune {
if unicode.Is(unicode.Latin, r) {
return r
}
return -1
}
m = Map(dropNotLatin, []byte("Hello, 세계"))
expect = "Hello"
if string(m) != expect {
t.Errorf("drop: expected %q got %q", expect, m)
}
// 6. Invalid rune
invalidRune := func(r rune) rune {
return utf8.MaxRune + 1
}
m = Map(invalidRune, []byte("x"))
expect = "\uFFFD"
if string(m) != expect {
t.Errorf("invalidRune: expected %q got %q", expect, m)
}
}
func TestToUpper(t *testing.T) { runStringTests(t, ToUpper, "ToUpper", upperTests) }
func TestToLower(t *testing.T) { runStringTests(t, ToLower, "ToLower", lowerTests) }
func TestTrimSpace(t *testing.T) { runStringTests(t, TrimSpace, "TrimSpace", trimSpaceTests) }
type RepeatTest struct {
in, out string
count int
}
var RepeatTests = []RepeatTest{
{"", "", 0},
{"", "", 1},
{"", "", 2},
{"-", "", 0},
{"-", "-", 1},
{"-", "----------", 10},
{"abc ", "abc abc abc ", 3},
}
func TestRepeat(t *testing.T) {
for _, tt := range RepeatTests {
tin := []byte(tt.in)
tout := []byte(tt.out)
a := Repeat(tin, tt.count)
if !Equal(a, tout) {
t.Errorf("Repeat(%q, %d) = %q; want %q", tin, tt.count, a, tout)
continue
}
}
}
func repeat(b []byte, count int) (err error) {
defer func() {
if r := recover(); r != nil {
switch v := r.(type) {
case error:
err = v
default:
err = fmt.Errorf("%s", v)
}
}
}()
Repeat(b, count)
return
}
// See Issue golang.org/issue/16237
func TestRepeatCatchesOverflow(t *testing.T) {
tests := [...]struct {
s string
count int
errStr string
}{
0: {"--", -2147483647, "negative"},
1: {"", int(^uint(0) >> 1), ""},
2: {"-", 10, ""},
3: {"gopher", 0, ""},
4: {"-", -1, "negative"},
5: {"--", -102, "negative"},
6: {string(make([]byte, 255)), int((^uint(0))/255 + 1), "overflow"},
}
for i, tt := range tests {
err := repeat([]byte(tt.s), tt.count)
if tt.errStr == "" {
if err != nil {
t.Errorf("#%d panicked %v", i, err)
}
continue
}
if err == nil || !strings.Contains(err.Error(), tt.errStr) {
t.Errorf("#%d expected %q got %q", i, tt.errStr, err)
}
}
}
func runesEqual(a, b []rune) bool {
if len(a) != len(b) {
return false
}
for i, r := range a {
if r != b[i] {
return false
}
}
return true
}
type RunesTest struct {
in string
out []rune
lossy bool
}
var RunesTests = []RunesTest{
{"", []rune{}, false},
{" ", []rune{32}, false},
{"ABC", []rune{65, 66, 67}, false},
{"abc", []rune{97, 98, 99}, false},
{"\u65e5\u672c\u8a9e", []rune{26085, 26412, 35486}, false},
{"ab\x80c", []rune{97, 98, 0xFFFD, 99}, true},
{"ab\xc0c", []rune{97, 98, 0xFFFD, 99}, true},
}
func TestRunes(t *testing.T) {
for _, tt := range RunesTests {
tin := []byte(tt.in)
a := Runes(tin)
if !runesEqual(a, tt.out) {
t.Errorf("Runes(%q) = %v; want %v", tin, a, tt.out)
continue
}
if !tt.lossy {
// can only test reassembly if we didn't lose information
s := string(a)
if s != tt.in {
t.Errorf("string(Runes(%q)) = %x; want %x", tin, s, tin)
}
}
}
}
type TrimTest struct {
f string
in, arg, out string
}
var trimTests = []TrimTest{
{"Trim", "abba", "a", "bb"},
{"Trim", "abba", "ab", ""},
{"TrimLeft", "abba", "ab", ""},
{"TrimRight", "abba", "ab", ""},
{"TrimLeft", "abba", "a", "bba"},
{"TrimRight", "abba", "a", "abb"},
{"Trim", "<tag>", "<>", "tag"},
{"Trim", "* listitem", " *", "listitem"},
{"Trim", `"quote"`, `"`, "quote"},
{"Trim", "\u2C6F\u2C6F\u0250\u0250\u2C6F\u2C6F", "\u2C6F", "\u0250\u0250"},
{"Trim", "\x80test\xff", "\xff", "test"},
{"Trim", " Ġ ", " ", "Ġ"},
{"Trim", " Ġİ0", "0 ", "Ġİ"},
//empty string tests
{"Trim", "abba", "", "abba"},
{"Trim", "", "123", ""},
{"Trim", "", "", ""},
{"TrimLeft", "abba", "", "abba"},
{"TrimLeft", "", "123", ""},
{"TrimLeft", "", "", ""},
{"TrimRight", "abba", "", "abba"},
{"TrimRight", "", "123", ""},
{"TrimRight", "", "", ""},
{"TrimRight", "☺\xc0", "☺", "☺\xc0"},
{"TrimPrefix", "aabb", "a", "abb"},
{"TrimPrefix", "aabb", "b", "aabb"},
{"TrimSuffix", "aabb", "a", "aabb"},
{"TrimSuffix", "aabb", "b", "aab"},
}
func TestTrim(t *testing.T) {
for _, tc := range trimTests {
name := tc.f
var f func([]byte, string) []byte
var fb func([]byte, []byte) []byte
switch name {
case "Trim":
f = Trim
case "TrimLeft":
f = TrimLeft
case "TrimRight":
f = TrimRight
case "TrimPrefix":
fb = TrimPrefix
case "TrimSuffix":
fb = TrimSuffix
default:
t.Errorf("Undefined trim function %s", name)
}
var actual string
if f != nil {
actual = string(f([]byte(tc.in), tc.arg))
} else {
actual = string(fb([]byte(tc.in), []byte(tc.arg)))
}
if actual != tc.out {
t.Errorf("%s(%q, %q) = %q; want %q", name, tc.in, tc.arg, actual, tc.out)
}
}
}
type predicate struct {
f func(r rune) bool
name string
}
var isSpace = predicate{unicode.IsSpace, "IsSpace"}
var isDigit = predicate{unicode.IsDigit, "IsDigit"}
var isUpper = predicate{unicode.IsUpper, "IsUpper"}
var isValidRune = predicate{
func(r rune) bool {
return r != utf8.RuneError
},
"IsValidRune",
}
type TrimFuncTest struct {
f predicate
in, out string
}
func not(p predicate) predicate {
return predicate{
func(r rune) bool {
return !p.f(r)
},
"not " + p.name,
}
}
var trimFuncTests = []TrimFuncTest{
{isSpace, space + " hello " + space, "hello"},
{isDigit, "\u0e50\u0e5212hello34\u0e50\u0e51", "hello"},
{isUpper, "\u2C6F\u2C6F\u2C6F\u2C6FABCDhelloEF\u2C6F\u2C6FGH\u2C6F\u2C6F", "hello"},
{not(isSpace), "hello" + space + "hello", space},
{not(isDigit), "hello\u0e50\u0e521234\u0e50\u0e51helo", "\u0e50\u0e521234\u0e50\u0e51"},
{isValidRune, "ab\xc0a\xc0cd", "\xc0a\xc0"},
{not(isValidRune), "\xc0a\xc0", "a"},
}
func TestTrimFunc(t *testing.T) {
for _, tc := range trimFuncTests {
actual := string(TrimFunc([]byte(tc.in), tc.f.f))
if actual != tc.out {
t.Errorf("TrimFunc(%q, %q) = %q; want %q", tc.in, tc.f.name, actual, tc.out)
}
}
}
type IndexFuncTest struct {
in string
f predicate
first, last int
}
var indexFuncTests = []IndexFuncTest{
{"", isValidRune, -1, -1},
{"abc", isDigit, -1, -1},
{"0123", isDigit, 0, 3},
{"a1b", isDigit, 1, 1},
{space, isSpace, 0, len(space) - 3}, // last rune in space is 3 bytes
{"\u0e50\u0e5212hello34\u0e50\u0e51", isDigit, 0, 18},
{"\u2C6F\u2C6F\u2C6F\u2C6FABCDhelloEF\u2C6F\u2C6FGH\u2C6F\u2C6F", isUpper, 0, 34},
{"12\u0e50\u0e52hello34\u0e50\u0e51", not(isDigit), 8, 12},
// tests of invalid UTF-8
{"\x801", isDigit, 1, 1},
{"\x80abc", isDigit, -1, -1},
{"\xc0a\xc0", isValidRune, 1, 1},
{"\xc0a\xc0", not(isValidRune), 0, 2},
{"\xc0☺\xc0", not(isValidRune), 0, 4},
{"\xc0☺\xc0\xc0", not(isValidRune), 0, 5},
{"ab\xc0a\xc0cd", not(isValidRune), 2, 4},
{"a\xe0\x80cd", not(isValidRune), 1, 2},
}
func TestIndexFunc(t *testing.T) {
for _, tc := range indexFuncTests {
first := IndexFunc([]byte(tc.in), tc.f.f)
if first != tc.first {
t.Errorf("IndexFunc(%q, %s) = %d; want %d", tc.in, tc.f.name, first, tc.first)
}
last := LastIndexFunc([]byte(tc.in), tc.f.f)
if last != tc.last {
t.Errorf("LastIndexFunc(%q, %s) = %d; want %d", tc.in, tc.f.name, last, tc.last)
}
}
}
type ReplaceTest struct {
in string
old, new string
n int
out string
}
var ReplaceTests = []ReplaceTest{
{"hello", "l", "L", 0, "hello"},
{"hello", "l", "L", -1, "heLLo"},
{"hello", "x", "X", -1, "hello"},
{"", "x", "X", -1, ""},
{"radar", "r", "<r>", -1, "<r>ada<r>"},
{"", "", "<>", -1, "<>"},
{"banana", "a", "<>", -1, "b<>n<>n<>"},
{"banana", "a", "<>", 1, "b<>nana"},
{"banana", "a", "<>", 1000, "b<>n<>n<>"},
{"banana", "an", "<>", -1, "b<><>a"},
{"banana", "ana", "<>", -1, "b<>na"},
{"banana", "", "<>", -1, "<>b<>a<>n<>a<>n<>a<>"},
{"banana", "", "<>", 10, "<>b<>a<>n<>a<>n<>a<>"},
{"banana", "", "<>", 6, "<>b<>a<>n<>a<>n<>a"},
{"banana", "", "<>", 5, "<>b<>a<>n<>a<>na"},
{"banana", "", "<>", 1, "<>banana"},
{"banana", "a", "a", -1, "banana"},
{"banana", "a", "a", 1, "banana"},
{"☺☻☹", "", "<>", -1, "<>☺<>☻<>☹<>"},
}
func TestReplace(t *testing.T) {
for _, tt := range ReplaceTests {
in := append([]byte(tt.in), "<spare>"...)
in = in[:len(tt.in)]
out := Replace(in, []byte(tt.old), []byte(tt.new), tt.n)
if s := string(out); s != tt.out {
t.Errorf("Replace(%q, %q, %q, %d) = %q, want %q", tt.in, tt.old, tt.new, tt.n, s, tt.out)
}
if cap(in) == cap(out) && &in[:1][0] == &out[:1][0] {
t.Errorf("Replace(%q, %q, %q, %d) didn't copy", tt.in, tt.old, tt.new, tt.n)
}
}
}
type TitleTest struct {
in, out string
}
var TitleTests = []TitleTest{
{"", ""},
{"a", "A"},
{" aaa aaa aaa ", " Aaa Aaa Aaa "},
{" Aaa Aaa Aaa ", " Aaa Aaa Aaa "},
{"123a456", "123a456"},
{"double-blind", "Double-Blind"},
{"ÿøû", "Ÿøû"},
{"with_underscore", "With_underscore"},
{"unicode \xe2\x80\xa8 line separator", "Unicode \xe2\x80\xa8 Line Separator"},
}
func TestTitle(t *testing.T) {
for _, tt := range TitleTests {
if s := string(Title([]byte(tt.in))); s != tt.out {
t.Errorf("Title(%q) = %q, want %q", tt.in, s, tt.out)
}
}
}
var ToTitleTests = []TitleTest{
{"", ""},
{"a", "A"},
{" aaa aaa aaa ", " AAA AAA AAA "},
{" Aaa Aaa Aaa ", " AAA AAA AAA "},
{"123a456", "123A456"},
{"double-blind", "DOUBLE-BLIND"},
{"ÿøû", "ŸØÛ"},
}
func TestToTitle(t *testing.T) {
for _, tt := range ToTitleTests {
if s := string(ToTitle([]byte(tt.in))); s != tt.out {
t.Errorf("ToTitle(%q) = %q, want %q", tt.in, s, tt.out)
}
}
}
var EqualFoldTests = []struct {
s, t string
out bool
}{
{"abc", "abc", true},
{"ABcd", "ABcd", true},
{"123abc", "123ABC", true},
{"αβδ", "ΑΒΔ", true},
{"abc", "xyz", false},
{"abc", "XYZ", false},
{"abcdefghijk", "abcdefghijX", false},
{"abcdefghijk", "abcdefghij\u212A", true},
{"abcdefghijK", "abcdefghij\u212A", true},
{"abcdefghijkz", "abcdefghij\u212Ay", false},
{"abcdefghijKz", "abcdefghij\u212Ay", false},
}
func TestEqualFold(t *testing.T) {
for _, tt := range EqualFoldTests {
if out := EqualFold([]byte(tt.s), []byte(tt.t)); out != tt.out {
t.Errorf("EqualFold(%#q, %#q) = %v, want %v", tt.s, tt.t, out, tt.out)
}
if out := EqualFold([]byte(tt.t), []byte(tt.s)); out != tt.out {
t.Errorf("EqualFold(%#q, %#q) = %v, want %v", tt.t, tt.s, out, tt.out)
}
}
}
func TestBufferGrowNegative(t *testing.T) {
defer func() {
if err := recover(); err == nil {
t.Fatal("Grow(-1) should have panicked")
}
}()
var b Buffer
b.Grow(-1)
}
func TestBufferTruncateNegative(t *testing.T) {
defer func() {
if err := recover(); err == nil {
t.Fatal("Truncate(-1) should have panicked")
}
}()
var b Buffer
b.Truncate(-1)
}
func TestBufferTruncateOutOfRange(t *testing.T) {
defer func() {
if err := recover(); err == nil {
t.Fatal("Truncate(20) should have panicked")
}
}()
var b Buffer
b.Write(make([]byte, 10))
b.Truncate(20)
}
var containsTests = []struct {
b, subslice []byte
want bool
}{
{[]byte("hello"), []byte("hel"), true},
{[]byte("日本語"), []byte("日本"), true},
{[]byte("hello"), []byte("Hello, world"), false},
{[]byte("東京"), []byte("京東"), false},
}
func TestContains(t *testing.T) {
for _, tt := range containsTests {
if got := Contains(tt.b, tt.subslice); got != tt.want {
t.Errorf("Contains(%q, %q) = %v, want %v", tt.b, tt.subslice, got, tt.want)
}
}
}
var ContainsAnyTests = []struct {
b []byte
substr string
expected bool
}{
{[]byte(""), "", false},
{[]byte(""), "a", false},
{[]byte(""), "abc", false},
{[]byte("a"), "", false},
{[]byte("a"), "a", true},
{[]byte("aaa"), "a", true},
{[]byte("abc"), "xyz", false},
{[]byte("abc"), "xcz", true},
{[]byte("a☺b☻c☹d"), "uvw☻xyz", true},
{[]byte("aRegExp*"), ".(|)*+?^$[]", true},
{[]byte(dots + dots + dots), " ", false},
}
func TestContainsAny(t *testing.T) {
for _, ct := range ContainsAnyTests {
if ContainsAny(ct.b, ct.substr) != ct.expected {
t.Errorf("ContainsAny(%s, %s) = %v, want %v",
ct.b, ct.substr, !ct.expected, ct.expected)
}
}
}
var ContainsRuneTests = []struct {
b []byte
r rune
expected bool
}{
{[]byte(""), 'a', false},
{[]byte("a"), 'a', true},
{[]byte("aaa"), 'a', true},
{[]byte("abc"), 'y', false},
{[]byte("abc"), 'c', true},
{[]byte("a☺b☻c☹d"), 'x', false},
{[]byte("a☺b☻c☹d"), '☻', true},
{[]byte("aRegExp*"), '*', true},
}
func TestContainsRune(t *testing.T) {
for _, ct := range ContainsRuneTests {
if ContainsRune(ct.b, ct.r) != ct.expected {
t.Errorf("ContainsRune(%q, %q) = %v, want %v",
ct.b, ct.r, !ct.expected, ct.expected)
}
}
}
var makeFieldsInput = func() []byte {
x := make([]byte, 1<<20)
// Input is ~10% space, ~10% 2-byte UTF-8, rest ASCII non-space.
for i := range x {
switch rand.Intn(10) {
case 0:
x[i] = ' '
case 1:
if i > 0 && x[i-1] == 'x' {
copy(x[i-1:], "χ")
break
}
fallthrough
default:
x[i] = 'x'
}
}
return x
}
var fieldsInput = makeFieldsInput()
func BenchmarkFields(b *testing.B) {
b.SetBytes(int64(len(fieldsInput)))
for i := 0; i < b.N; i++ {
Fields(fieldsInput)
}
}
func BenchmarkFieldsFunc(b *testing.B) {
b.SetBytes(int64(len(fieldsInput)))
for i := 0; i < b.N; i++ {
FieldsFunc(fieldsInput, unicode.IsSpace)
}
}
func BenchmarkTrimSpace(b *testing.B) {
s := []byte(" Some text. \n")
for i := 0; i < b.N; i++ {
TrimSpace(s)
}
}
func BenchmarkRepeat(b *testing.B) {
for i := 0; i < b.N; i++ {
Repeat([]byte("-"), 80)
}
}
func BenchmarkBytesCompare(b *testing.B) {
for n := 1; n <= 2048; n <<= 1 {
b.Run(fmt.Sprint(n), func(b *testing.B) {
var x = make([]byte, n)
var y = make([]byte, n)
for i := 0; i < n; i++ {
x[i] = 'a'
}
for i := 0; i < n; i++ {
y[i] = 'a'
}
b.ResetTimer()
for i := 0; i < b.N; i++ {
Compare(x, y)
}
})
}
}
func BenchmarkIndexAnyASCII(b *testing.B) {
x := Repeat([]byte{'#'}, 4096) // Never matches set
cs := "0123456789abcdef"
for k := 1; k <= 4096; k <<= 4 {
for j := 1; j <= 16; j <<= 1 {
b.Run(fmt.Sprintf("%d:%d", k, j), func(b *testing.B) {
for i := 0; i < b.N; i++ {
IndexAny(x[:k], cs[:j])
}
})
}
}
}
func BenchmarkTrimASCII(b *testing.B) {
cs := "0123456789abcdef"
for k := 1; k <= 4096; k <<= 4 {
for j := 1; j <= 16; j <<= 1 {
b.Run(fmt.Sprintf("%d:%d", k, j), func(b *testing.B) {
x := Repeat([]byte(cs[:j]), k) // Always matches set
for i := 0; i < b.N; i++ {
Trim(x[:k], cs[:j])
}
})
}
}
}