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// Copyright 2012 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 strconv_test
import (
"runtime"
. "strconv"
"strings"
"testing"
)
var (
globalBuf [64]byte
nextToOne = "1.00000000000000011102230246251565404236316680908203125" + strings.Repeat("0", 10000) + "1"
mallocTest = []struct {
count int
desc string
fn func()
}{
{0, `AppendInt(localBuf[:0], 123, 10)`, func() {
var localBuf [64]byte
AppendInt(localBuf[:0], 123, 10)
}},
{0, `AppendInt(globalBuf[:0], 123, 10)`, func() { AppendInt(globalBuf[:0], 123, 10) }},
{0, `AppendFloat(localBuf[:0], 1.23, 'g', 5, 64)`, func() {
var localBuf [64]byte
AppendFloat(localBuf[:0], 1.23, 'g', 5, 64)
}},
{0, `AppendFloat(globalBuf[:0], 1.23, 'g', 5, 64)`, func() { AppendFloat(globalBuf[:0], 1.23, 'g', 5, 64) }},
// In practice we see 7 for the next one, but allow some slop.
// Before pre-allocation in appendQuotedWith, we saw 39.
{10, `AppendQuoteToASCII(nil, oneMB)`, func() { AppendQuoteToASCII(nil, string(oneMB)) }},
{0, `ParseFloat("123.45", 64)`, func() { ParseFloat("123.45", 64) }},
{0, `ParseFloat("123.456789123456789", 64)`, func() { ParseFloat("123.456789123456789", 64) }},
{0, `ParseFloat("1.000000000000000111022302462515654042363166809082031251", 64)`, func() {
ParseFloat("1.000000000000000111022302462515654042363166809082031251", 64)
}},
{0, `ParseFloat("1.0000000000000001110223024625156540423631668090820312500...001", 64)`, func() {
ParseFloat(nextToOne, 64)
}},
}
)
var oneMB []byte // Will be allocated to 1MB of random data by TestCountMallocs.
func TestCountMallocs(t *testing.T) {
if testing.Short() {
t.Skip("skipping malloc count in short mode")
}
if runtime.GOMAXPROCS(0) > 1 {
t.Skip("skipping; GOMAXPROCS>1")
}
// Allocate a big messy buffer for AppendQuoteToASCII's test.
oneMB = make([]byte, 1e6)
for i := range oneMB {
oneMB[i] = byte(i)
}
for _, mt := range mallocTest {
allocs := testing.AllocsPerRun(100, mt.fn)
if max := float64(mt.count); allocs > max {
t.Errorf("%s: %v allocs, want <=%v", mt.desc, allocs, max)
}
}
}
// Sink makes sure the compiler cannot optimize away the benchmarks.
var Sink struct {
Bool bool
Int int
Int64 int64
Uint64 uint64
Float64 float64
Complex128 complex128
Error error
Bytes []byte
}
func TestAllocationsFromBytes(t *testing.T) {
const runsPerTest = 100
bytes := struct{ Bool, Number, String, Buffer []byte }{
Bool: []byte("false"),
Number: []byte("123456789"),
String: []byte("hello, world!"),
Buffer: make([]byte, 1024),
}
checkNoAllocs := func(f func()) func(t *testing.T) {
return func(t *testing.T) {
t.Helper()
if allocs := testing.AllocsPerRun(runsPerTest, f); allocs != 0 {
t.Errorf("got %v allocs, want 0 allocs", allocs)
}
}
}
t.Run("Atoi", checkNoAllocs(func() {
Sink.Int, Sink.Error = Atoi(string(bytes.Number))
}))
t.Run("ParseBool", checkNoAllocs(func() {
Sink.Bool, Sink.Error = ParseBool(string(bytes.Bool))
}))
t.Run("ParseInt", checkNoAllocs(func() {
Sink.Int64, Sink.Error = ParseInt(string(bytes.Number), 10, 64)
}))
t.Run("ParseUint", checkNoAllocs(func() {
Sink.Uint64, Sink.Error = ParseUint(string(bytes.Number), 10, 64)
}))
t.Run("ParseFloat", checkNoAllocs(func() {
Sink.Float64, Sink.Error = ParseFloat(string(bytes.Number), 64)
}))
t.Run("ParseComplex", checkNoAllocs(func() {
Sink.Complex128, Sink.Error = ParseComplex(string(bytes.Number), 128)
}))
t.Run("CanBackquote", checkNoAllocs(func() {
Sink.Bool = CanBackquote(string(bytes.String))
}))
t.Run("AppendQuote", checkNoAllocs(func() {
Sink.Bytes = AppendQuote(bytes.Buffer[:0], string(bytes.String))
}))
t.Run("AppendQuoteToASCII", checkNoAllocs(func() {
Sink.Bytes = AppendQuoteToASCII(bytes.Buffer[:0], string(bytes.String))
}))
t.Run("AppendQuoteToGraphic", checkNoAllocs(func() {
Sink.Bytes = AppendQuoteToGraphic(bytes.Buffer[:0], string(bytes.String))
}))
}
func TestErrorPrefixes(t *testing.T) {
_, errInt := Atoi("INVALID")
_, errBool := ParseBool("INVALID")
_, errFloat := ParseFloat("INVALID", 64)
_, errInt64 := ParseInt("INVALID", 10, 64)
_, errUint64 := ParseUint("INVALID", 10, 64)
vectors := []struct {
err error // Input error
want string // Function name wanted
}{
{errInt, "Atoi"},
{errBool, "ParseBool"},
{errFloat, "ParseFloat"},
{errInt64, "ParseInt"},
{errUint64, "ParseUint"},
}
for _, v := range vectors {
nerr, ok := v.err.(*NumError)
if !ok {
t.Errorf("test %s, error was not a *NumError", v.want)
continue
}
if got := nerr.Func; got != v.want {
t.Errorf("mismatching Func: got %s, want %s", got, v.want)
}
}
}
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