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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 strconv_test

import (

        "math"

        "math/rand"

        "reflect"

        . "strconv"

        "testing"

        "time"

)

type atofTest struct {

        in  string

        out string

        err error

}

var atoftests = []atofTest{

        {"", "0", ErrSyntax},

        {"1", "1", nil},

        {"+1", "1", nil},

        {"1x", "0", ErrSyntax},

        {"1.1.", "0", ErrSyntax},

        {"1e23", "1e+23", nil},

        {"1E23", "1e+23", nil},

        {"100000000000000000000000", "1e+23", nil},

        {"1e-100", "1e-100", nil},

        {"123456700", "1.234567e+08", nil},

        {"99999999999999974834176", "9.999999999999997e+22", nil},

        {"100000000000000000000001", "1.0000000000000001e+23", nil},

        {"100000000000000008388608", "1.0000000000000001e+23", nil},

        {"100000000000000016777215", "1.0000000000000001e+23", nil},

        {"100000000000000016777216", "1.0000000000000003e+23", nil},

        {"-1", "-1", nil},

        {"-0.1", "-0.1", nil},

        {"-0", "-0", nil},

        {"1e-20", "1e-20", nil},

        {"625e-3", "0.625", nil},

        // NaNs

        {"nan", "NaN", nil},

        {"NaN", "NaN", nil},

        {"NAN", "NaN", nil},

        // Infs

        {"inf", "+Inf", nil},

        {"-Inf", "-Inf", nil},

        {"+INF", "+Inf", nil},

        {"-Infinity", "-Inf", nil},

        {"+INFINITY", "+Inf", nil},

        {"Infinity", "+Inf", nil},

        // largest float64

        {"1.7976931348623157e308", "1.7976931348623157e+308", nil},

        {"-1.7976931348623157e308", "-1.7976931348623157e+308", nil},

        // next float64 - too large

        {"1.7976931348623159e308", "+Inf", ErrRange},

        {"-1.7976931348623159e308", "-Inf", ErrRange},

        // the border is ...158079

        // borderline - okay

        {"1.7976931348623158e308", "1.7976931348623157e+308", nil},

        {"-1.7976931348623158e308", "-1.7976931348623157e+308", nil},

        // borderline - too large

        {"1.797693134862315808e308", "+Inf", ErrRange},

        {"-1.797693134862315808e308", "-Inf", ErrRange},

        // a little too large

        {"1e308", "1e+308", nil},

        {"2e308", "+Inf", ErrRange},

        {"1e309", "+Inf", ErrRange},

        // way too large

        {"1e310", "+Inf", ErrRange},

        {"-1e310", "-Inf", ErrRange},

        {"1e400", "+Inf", ErrRange},

        {"-1e400", "-Inf", ErrRange},

        {"1e400000", "+Inf", ErrRange},

        {"-1e400000", "-Inf", ErrRange},

        // denormalized

        {"1e-305", "1e-305", nil},

        {"1e-306", "1e-306", nil},

        {"1e-307", "1e-307", nil},

        {"1e-308", "1e-308", nil},

        {"1e-309", "1e-309", nil},

        {"1e-310", "1e-310", nil},

        {"1e-322", "1e-322", nil},

        // smallest denormal

        {"5e-324", "5e-324", nil},

        {"4e-324", "5e-324", nil},

        {"3e-324", "5e-324", nil},

        // too small

        {"2e-324", "0", nil},

        // way too small

        {"1e-350", "0", nil},

        {"1e-400000", "0", nil},

        // try to overflow exponent

        {"1e-4294967296", "0", nil},

        {"1e+4294967296", "+Inf", ErrRange},

        {"1e-18446744073709551616", "0", nil},

        {"1e+18446744073709551616", "+Inf", ErrRange},

        // Parse errors

        {"1e", "0", ErrSyntax},

        {"1e-", "0", ErrSyntax},

        {".e-1", "0", ErrSyntax},

        // http://www.exploringbinary.com/java-hangs-when-converting-2-2250738585072012e-308/

        {"2.2250738585072012e-308", "2.2250738585072014e-308", nil},

        // http://www.exploringbinary.com/php-hangs-on-numeric-value-2-2250738585072011e-308/

        {"2.2250738585072011e-308", "2.225073858507201e-308", nil},

        // A very large number (initially wrongly parsed by the fast algorithm).

        {"4.630813248087435e+307", "4.630813248087435e+307", nil},

}

type atofSimpleTest struct {

        x float64

        s string

}

var (

        atofRandomTests        []atofSimpleTest

        benchmarksRandomBits   [1024]string

        benchmarksRandomNormal [1024]string

)

func init() {

        // The atof routines return NumErrors wrapping

        // the error and the string.  Convert the table above.

        for i := range atoftests {

                test := &atoftests[i]

                if test.err != nil {

                        test.err = &NumError{"ParseFloat", test.in, test.err}

                }

        }

        // Generate random inputs for tests and benchmarks

        rand.Seed(time.Now().UnixNano())

        if testing.Short() {

                atofRandomTests = make([]atofSimpleTest, 100)

        } else {

                atofRandomTests = make([]atofSimpleTest, 10000)

        }

        for i := range atofRandomTests {

                n := uint64(rand.Uint32())<<32 | uint64(rand.Uint32())

                x := math.Float64frombits(n)

                s := FormatFloat(x, 'g', -1, 64)

                atofRandomTests[i] = atofSimpleTest{x, s}

        }

        for i := range benchmarksRandomBits {

                bits := uint64(rand.Uint32())<<32 | uint64(rand.Uint32())

                x := math.Float64frombits(bits)

                benchmarksRandomBits[i] = FormatFloat(x, 'g', -1, 64)

        }

        for i := range benchmarksRandomNormal {

                x := rand.NormFloat64()

                benchmarksRandomNormal[i] = FormatFloat(x, 'g', -1, 64)

        }

}

func testAtof(t *testing.T, opt bool) {

        oldopt := SetOptimize(opt)

        for i := 0; i < len(atoftests); i++ {

                test := &atoftests[i]

                out, err := ParseFloat(test.in, 64)

                outs := FormatFloat(out, 'g', -1, 64)

                if outs != test.out || !reflect.DeepEqual(err, test.err) {

                        t.Errorf("ParseFloat(%v, 64) = %v, %v want %v, %v",

                                test.in, out, err, test.out, test.err)

                }

                if float64(float32(out)) == out {

                        out, err := ParseFloat(test.in, 32)

                        out32 := float32(out)

                        if float64(out32) != out {

                                t.Errorf("ParseFloat(%v, 32) = %v, not a float32 (closest is %v)", test.in, out, float64(out32))

                                continue

                        }

                        outs := FormatFloat(float64(out32), 'g', -1, 32)

                        if outs != test.out || !reflect.DeepEqual(err, test.err) {

                                t.Errorf("ParseFloat(%v, 32) = %v, %v want %v, %v  # %v",

                                        test.in, out32, err, test.out, test.err, out)

                        }

                }

        }

        SetOptimize(oldopt)

}

func TestAtof(t *testing.T) { testAtof(t, true) }

func TestAtofSlow(t *testing.T) { testAtof(t, false) }

func TestAtofRandom(t *testing.T) {

        for _, test := range atofRandomTests {

                x, _ := ParseFloat(test.s, 64)

                switch {

                default:

                        t.Errorf("number %s badly parsed as %b (expected %b)", test.s, x, test.x)

                case x == test.x:

                case math.IsNaN(test.x) && math.IsNaN(x):

                }

        }

        t.Logf("tested %d random numbers", len(atofRandomTests))

}

func BenchmarkAtof64Decimal(b *testing.B) {

        for i := 0; i < b.N; i++ {

                ParseFloat("33909", 64)

        }

}

func BenchmarkAtof64Float(b *testing.B) {

        for i := 0; i < b.N; i++ {

                ParseFloat("339.7784", 64)

        }

}

func BenchmarkAtof64FloatExp(b *testing.B) {

        for i := 0; i < b.N; i++ {

                ParseFloat("-5.09e75", 64)

        }

}

func BenchmarkAtof64Big(b *testing.B) {

        for i := 0; i < b.N; i++ {

                ParseFloat("123456789123456789123456789", 64)

        }

}

func BenchmarkAtof64RandomBits(b *testing.B) {

        for i := 0; i < b.N; i++ {

                ParseFloat(benchmarksRandomBits[i%1024], 64)

        }

}

func BenchmarkAtof64RandomFloats(b *testing.B) {

        for i := 0; i < b.N; i++ {

                ParseFloat(benchmarksRandomNormal[i%1024], 64)

        }

}