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// 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 strings_test
import (
"bytes"
"fmt"
"log"
. "strings"
"testing"
)
var _ = log.Printf
type ReplacerTest struct {
r *Replacer
in string
out string
}
var htmlEscaper = NewReplacer("&", "&", "<", "<", ">", ">", "\"", """)
// The http package's old HTML escaping function.
func oldhtmlEscape(s string) string {
s = Replace(s, "&", "&", -1)
s = Replace(s, "<", "<", -1)
s = Replace(s, ">", ">", -1)
s = Replace(s, "\"", """, -1)
s = Replace(s, "'", "'", -1)
return s
}
var replacer = NewReplacer("aaa", "3[aaa]", "aa", "2[aa]", "a", "1[a]", "i", "i",
"longerst", "most long", "longer", "medium", "long", "short",
"X", "Y", "Y", "Z")
var capitalLetters = NewReplacer("a", "A", "b", "B")
var blankToXReplacer = NewReplacer("", "X", "o", "O")
var ReplacerTests = []ReplacerTest{
// byte->string
{htmlEscaper, "No changes", "No changes"},
{htmlEscaper, "I <3 escaping & stuff", "I <3 escaping & stuff"},
{htmlEscaper, "&&&", "&&&"},
// generic
{replacer, "fooaaabar", "foo3[aaa]b1[a]r"},
{replacer, "long, longerst, longer", "short, most long, medium"},
{replacer, "XiX", "YiY"},
// byte->byte
{capitalLetters, "brad", "BrAd"},
{capitalLetters, Repeat("a", (32<<10)+123), Repeat("A", (32<<10)+123)},
// hitting "" special case
{blankToXReplacer, "oo", "XOXOX"},
}
func TestReplacer(t *testing.T) {
for i, tt := range ReplacerTests {
if s := tt.r.Replace(tt.in); s != tt.out {
t.Errorf("%d. Replace(%q) = %q, want %q", i, tt.in, s, tt.out)
}
var buf bytes.Buffer
n, err := tt.r.WriteString(&buf, tt.in)
if err != nil {
t.Errorf("%d. WriteString: %v", i, err)
continue
}
got := buf.String()
if got != tt.out {
t.Errorf("%d. WriteString(%q) wrote %q, want %q", i, tt.in, got, tt.out)
continue
}
if n != len(tt.out) {
t.Errorf("%d. WriteString(%q) wrote correct string but reported %d bytes; want %d (%q)",
i, tt.in, n, len(tt.out), tt.out)
}
}
}
// pickAlgorithmTest is a test that verifies that given input for a
// Replacer that we pick the correct algorithm.
type pickAlgorithmTest struct {
r *Replacer
want string // name of algorithm
}
var pickAlgorithmTests = []pickAlgorithmTest{
{capitalLetters, "*strings.byteReplacer"},
{NewReplacer("12", "123"), "*strings.genericReplacer"},
{NewReplacer("1", "12"), "*strings.byteStringReplacer"},
{htmlEscaper, "*strings.byteStringReplacer"},
}
func TestPickAlgorithm(t *testing.T) {
for i, tt := range pickAlgorithmTests {
got := fmt.Sprintf("%T", tt.r.Replacer())
if got != tt.want {
t.Errorf("%d. algorithm = %s, want %s", i, got, tt.want)
}
}
}
func BenchmarkGenericMatch(b *testing.B) {
str := Repeat("A", 100) + Repeat("B", 100)
generic := NewReplacer("a", "A", "b", "B", "12", "123") // varying lengths forces generic
for i := 0; i < b.N; i++ {
generic.Replace(str)
}
}
func BenchmarkByteByteNoMatch(b *testing.B) {
str := Repeat("A", 100) + Repeat("B", 100)
for i := 0; i < b.N; i++ {
capitalLetters.Replace(str)
}
}
func BenchmarkByteByteMatch(b *testing.B) {
str := Repeat("a", 100) + Repeat("b", 100)
for i := 0; i < b.N; i++ {
capitalLetters.Replace(str)
}
}
func BenchmarkByteStringMatch(b *testing.B) {
str := "<" + Repeat("a", 99) + Repeat("b", 99) + ">"
for i := 0; i < b.N; i++ {
htmlEscaper.Replace(str)
}
}
func BenchmarkHTMLEscapeNew(b *testing.B) {
str := "I <3 to escape HTML & other text too."
for i := 0; i < b.N; i++ {
htmlEscaper.Replace(str)
}
}
func BenchmarkHTMLEscapeOld(b *testing.B) {
str := "I <3 to escape HTML & other text too."
for i := 0; i < b.N; i++ {
oldhtmlEscape(str)
}
}
// BenchmarkByteByteReplaces compares byteByteImpl against multiple Replaces.
func BenchmarkByteByteReplaces(b *testing.B) {
str := Repeat("a", 100) + Repeat("b", 100)
for i := 0; i < b.N; i++ {
Replace(Replace(str, "a", "A", -1), "b", "B", -1)
}
}
// BenchmarkByteByteMap compares byteByteImpl against Map.
func BenchmarkByteByteMap(b *testing.B) {
str := Repeat("a", 100) + Repeat("b", 100)
fn := func(r int) int {
switch r {
case 'a':
return int('A')
case 'b':
return int('B')
}
return r
}
for i := 0; i < b.N; i++ {
Map(fn, str)
}
}
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