249 lines
6.4 KiB
Go
249 lines
6.4 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package strconv_test
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import (
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"math"
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"math/rand"
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"reflect"
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. "strconv"
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"testing"
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"time"
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)
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type atofTest struct {
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in string
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out string
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err error
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}
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var atoftests = []atofTest{
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{"", "0", ErrSyntax},
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{"1", "1", nil},
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{"+1", "1", nil},
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{"1x", "0", ErrSyntax},
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{"1.1.", "0", ErrSyntax},
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{"1e23", "1e+23", nil},
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{"1E23", "1e+23", nil},
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{"100000000000000000000000", "1e+23", nil},
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{"1e-100", "1e-100", nil},
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{"123456700", "1.234567e+08", nil},
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{"99999999999999974834176", "9.999999999999997e+22", nil},
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{"100000000000000000000001", "1.0000000000000001e+23", nil},
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{"100000000000000008388608", "1.0000000000000001e+23", nil},
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{"100000000000000016777215", "1.0000000000000001e+23", nil},
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{"100000000000000016777216", "1.0000000000000003e+23", nil},
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{"-1", "-1", nil},
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{"-0.1", "-0.1", nil},
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{"-0", "-0", nil},
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{"1e-20", "1e-20", nil},
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{"625e-3", "0.625", nil},
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// NaNs
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{"nan", "NaN", nil},
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{"NaN", "NaN", nil},
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{"NAN", "NaN", nil},
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// Infs
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{"inf", "+Inf", nil},
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{"-Inf", "-Inf", nil},
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{"+INF", "+Inf", nil},
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{"-Infinity", "-Inf", nil},
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{"+INFINITY", "+Inf", nil},
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{"Infinity", "+Inf", nil},
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// largest float64
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{"1.7976931348623157e308", "1.7976931348623157e+308", nil},
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{"-1.7976931348623157e308", "-1.7976931348623157e+308", nil},
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// next float64 - too large
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{"1.7976931348623159e308", "+Inf", ErrRange},
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{"-1.7976931348623159e308", "-Inf", ErrRange},
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// the border is ...158079
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// borderline - okay
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{"1.7976931348623158e308", "1.7976931348623157e+308", nil},
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{"-1.7976931348623158e308", "-1.7976931348623157e+308", nil},
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// borderline - too large
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{"1.797693134862315808e308", "+Inf", ErrRange},
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{"-1.797693134862315808e308", "-Inf", ErrRange},
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// a little too large
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{"1e308", "1e+308", nil},
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{"2e308", "+Inf", ErrRange},
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{"1e309", "+Inf", ErrRange},
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// way too large
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{"1e310", "+Inf", ErrRange},
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{"-1e310", "-Inf", ErrRange},
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{"1e400", "+Inf", ErrRange},
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{"-1e400", "-Inf", ErrRange},
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{"1e400000", "+Inf", ErrRange},
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{"-1e400000", "-Inf", ErrRange},
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// denormalized
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{"1e-305", "1e-305", nil},
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{"1e-306", "1e-306", nil},
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{"1e-307", "1e-307", nil},
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{"1e-308", "1e-308", nil},
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{"1e-309", "1e-309", nil},
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{"1e-310", "1e-310", nil},
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{"1e-322", "1e-322", nil},
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// smallest denormal
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{"5e-324", "5e-324", nil},
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{"4e-324", "5e-324", nil},
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{"3e-324", "5e-324", nil},
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// too small
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{"2e-324", "0", nil},
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// way too small
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{"1e-350", "0", nil},
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{"1e-400000", "0", nil},
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// try to overflow exponent
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{"1e-4294967296", "0", nil},
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{"1e+4294967296", "+Inf", ErrRange},
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{"1e-18446744073709551616", "0", nil},
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{"1e+18446744073709551616", "+Inf", ErrRange},
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// Parse errors
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{"1e", "0", ErrSyntax},
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{"1e-", "0", ErrSyntax},
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{".e-1", "0", ErrSyntax},
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// http://www.exploringbinary.com/java-hangs-when-converting-2-2250738585072012e-308/
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{"2.2250738585072012e-308", "2.2250738585072014e-308", nil},
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// http://www.exploringbinary.com/php-hangs-on-numeric-value-2-2250738585072011e-308/
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{"2.2250738585072011e-308", "2.225073858507201e-308", nil},
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// A very large number (initially wrongly parsed by the fast algorithm).
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{"4.630813248087435e+307", "4.630813248087435e+307", nil},
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}
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type atofSimpleTest struct {
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x float64
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s string
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}
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var (
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atofRandomTests []atofSimpleTest
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benchmarksRandomBits [1024]string
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benchmarksRandomNormal [1024]string
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)
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func init() {
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// The atof routines return NumErrors wrapping
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// the error and the string. Convert the table above.
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for i := range atoftests {
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test := &atoftests[i]
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if test.err != nil {
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test.err = &NumError{"ParseFloat", test.in, test.err}
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}
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}
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// Generate random inputs for tests and benchmarks
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rand.Seed(time.Now().UnixNano())
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if testing.Short() {
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atofRandomTests = make([]atofSimpleTest, 100)
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} else {
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atofRandomTests = make([]atofSimpleTest, 10000)
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}
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for i := range atofRandomTests {
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n := uint64(rand.Uint32())<<32 | uint64(rand.Uint32())
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x := math.Float64frombits(n)
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s := FormatFloat(x, 'g', -1, 64)
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atofRandomTests[i] = atofSimpleTest{x, s}
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}
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for i := range benchmarksRandomBits {
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bits := uint64(rand.Uint32())<<32 | uint64(rand.Uint32())
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x := math.Float64frombits(bits)
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benchmarksRandomBits[i] = FormatFloat(x, 'g', -1, 64)
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}
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for i := range benchmarksRandomNormal {
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x := rand.NormFloat64()
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benchmarksRandomNormal[i] = FormatFloat(x, 'g', -1, 64)
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}
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}
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func testAtof(t *testing.T, opt bool) {
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oldopt := SetOptimize(opt)
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for i := 0; i < len(atoftests); i++ {
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test := &atoftests[i]
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out, err := ParseFloat(test.in, 64)
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outs := FormatFloat(out, 'g', -1, 64)
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if outs != test.out || !reflect.DeepEqual(err, test.err) {
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t.Errorf("ParseFloat(%v, 64) = %v, %v want %v, %v",
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test.in, out, err, test.out, test.err)
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}
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if float64(float32(out)) == out {
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out, err := ParseFloat(test.in, 32)
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out32 := float32(out)
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if float64(out32) != out {
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t.Errorf("ParseFloat(%v, 32) = %v, not a float32 (closest is %v)", test.in, out, float64(out32))
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continue
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}
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outs := FormatFloat(float64(out32), 'g', -1, 32)
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if outs != test.out || !reflect.DeepEqual(err, test.err) {
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t.Errorf("ParseFloat(%v, 32) = %v, %v want %v, %v # %v",
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test.in, out32, err, test.out, test.err, out)
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}
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}
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}
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SetOptimize(oldopt)
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}
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func TestAtof(t *testing.T) { testAtof(t, true) }
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func TestAtofSlow(t *testing.T) { testAtof(t, false) }
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func TestAtofRandom(t *testing.T) {
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for _, test := range atofRandomTests {
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x, _ := ParseFloat(test.s, 64)
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switch {
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default:
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t.Errorf("number %s badly parsed as %b (expected %b)", test.s, x, test.x)
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case x == test.x:
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case math.IsNaN(test.x) && math.IsNaN(x):
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}
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}
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t.Logf("tested %d random numbers", len(atofRandomTests))
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}
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func BenchmarkAtof64Decimal(b *testing.B) {
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for i := 0; i < b.N; i++ {
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ParseFloat("33909", 64)
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}
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}
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func BenchmarkAtof64Float(b *testing.B) {
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for i := 0; i < b.N; i++ {
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ParseFloat("339.7784", 64)
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}
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}
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func BenchmarkAtof64FloatExp(b *testing.B) {
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for i := 0; i < b.N; i++ {
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ParseFloat("-5.09e75", 64)
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}
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}
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func BenchmarkAtof64Big(b *testing.B) {
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for i := 0; i < b.N; i++ {
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ParseFloat("123456789123456789123456789", 64)
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}
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}
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func BenchmarkAtof64RandomBits(b *testing.B) {
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for i := 0; i < b.N; i++ {
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ParseFloat(benchmarksRandomBits[i%1024], 64)
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}
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}
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func BenchmarkAtof64RandomFloats(b *testing.B) {
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for i := 0; i < b.N; i++ {
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ParseFloat(benchmarksRandomNormal[i%1024], 64)
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}
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}
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