libgo/go/strconv/atof_test.go

   1 // Copyright 2009 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 package strconv_test
   6
   7 import (
   8         "os"
   9         "reflect"
  10         . "strconv"
  11         "testing"
  12 )
  13
  14 type atofTest struct {
  15         in  string
  16         out string
  17         err os.Error
  18 }
  19
  20 var atoftests = []atofTest{
  21         {"", "0", os.EINVAL},
  22         {"1", "1", nil},
  23         {"+1", "1", nil},
  24         {"1x", "0", os.EINVAL},
  25         {"1.1.", "0", os.EINVAL},
  26         {"1e23", "1e+23", nil},
  27         {"100000000000000000000000", "1e+23", nil},
  28         {"1e-100", "1e-100", nil},
  29         {"123456700", "1.234567e+08", nil},
  30         {"99999999999999974834176", "9.999999999999997e+22", nil},
  31         {"100000000000000000000001", "1.0000000000000001e+23", nil},
  32         {"100000000000000008388608", "1.0000000000000001e+23", nil},
  33         {"100000000000000016777215", "1.0000000000000001e+23", nil},
  34         {"100000000000000016777216", "1.0000000000000003e+23", nil},
  35         {"-1", "-1", nil},
  36         {"-0", "-0", nil},
  37         {"1e-20", "1e-20", nil},
  38         {"625e-3", "0.625", nil},
  39
  40         // largest float64
  41         {"1.7976931348623157e308", "1.7976931348623157e+308", nil},
  42         {"-1.7976931348623157e308", "-1.7976931348623157e+308", nil},
  43         // next float64 - too large
  44         {"1.7976931348623159e308", "+Inf", os.ERANGE},
  45         {"-1.7976931348623159e308", "-Inf", os.ERANGE},
  46         // the border is ...158079
  47         // borderline - okay
  48         {"1.7976931348623158e308", "1.7976931348623157e+308", nil},
  49         {"-1.7976931348623158e308", "-1.7976931348623157e+308", nil},
  50         // borderline - too large
  51         {"1.797693134862315808e308", "+Inf", os.ERANGE},
  52         {"-1.797693134862315808e308", "-Inf", os.ERANGE},
  53
  54         // a little too large
  55         {"1e308", "1e+308", nil},
  56         {"2e308", "+Inf", os.ERANGE},
  57         {"1e309", "+Inf", os.ERANGE},
  58
  59         // way too large
  60         {"1e310", "+Inf", os.ERANGE},
  61         {"-1e310", "-Inf", os.ERANGE},
  62         {"1e400", "+Inf", os.ERANGE},
  63         {"-1e400", "-Inf", os.ERANGE},
  64         {"1e400000", "+Inf", os.ERANGE},
  65         {"-1e400000", "-Inf", os.ERANGE},
  66
  67         // denormalized
  68         {"1e-305", "1e-305", nil},
  69         {"1e-306", "1e-306", nil},
  70         {"1e-307", "1e-307", nil},
  71         {"1e-308", "1e-308", nil},
  72         {"1e-309", "1e-309", nil},
  73         {"1e-310", "1e-310", nil},
  74         {"1e-322", "1e-322", nil},
  75         // smallest denormal
  76         {"5e-324", "5e-324", nil},
  77         {"4e-324", "5e-324", nil},
  78         {"3e-324", "5e-324", nil},
  79         // too small
  80         {"2e-324", "0", nil},
  81         // way too small
  82         {"1e-350", "0", nil},
  83         {"1e-400000", "0", nil},
  84
  85         // try to overflow exponent
  86         {"1e-4294967296", "0", nil},
  87         {"1e+4294967296", "+Inf", os.ERANGE},
  88         {"1e-18446744073709551616", "0", nil},
  89         {"1e+18446744073709551616", "+Inf", os.ERANGE},
  90
  91         // Parse errors
  92         {"1e", "0", os.EINVAL},
  93         {"1e-", "0", os.EINVAL},
  94         {".e-1", "0", os.EINVAL},
  95 }
  96
  97 func init() {
  98         // The atof routines return NumErrors wrapping
  99         // the error and the string.  Convert the table above.
 100         for i := range atoftests {
 101                 test := &atoftests[i]
 102                 if test.err != nil {
 103                         test.err = &NumError{test.in, test.err}
 104                 }
 105         }
 106 }
 107
 108 func testAtof(t *testing.T, opt bool) {
 109         oldopt := SetOptimize(opt)
 110         for i := 0; i < len(atoftests); i++ {
 111                 test := &atoftests[i]
 112                 out, err := Atof64(test.in)
 113                 outs := Ftoa64(out, 'g', -1)
 114                 if outs != test.out || !reflect.DeepEqual(err, test.err) {
 115                         t.Errorf("Atof64(%v) = %v, %v want %v, %v",
 116                                 test.in, out, err, test.out, test.err)
 117                 }
 118
 119                 out, err = AtofN(test.in, 64)
 120                 outs = FtoaN(out, 'g', -1, 64)
 121                 if outs != test.out || !reflect.DeepEqual(err, test.err) {
 122                         t.Errorf("AtofN(%v, 64) = %v, %v want %v, %v",
 123                                 test.in, out, err, test.out, test.err)
 124                 }
 125
 126                 if float64(float32(out)) == out {
 127                         out32, err := Atof32(test.in)
 128                         outs := Ftoa32(out32, 'g', -1)
 129                         if outs != test.out || !reflect.DeepEqual(err, test.err) {
 130                                 t.Errorf("Atof32(%v) = %v, %v want %v, %v  # %v",
 131                                         test.in, out32, err, test.out, test.err, out)
 132                         }
 133
 134                         out, err := AtofN(test.in, 32)
 135                         out32 = float32(out)
 136                         outs = FtoaN(float64(out32), 'g', -1, 32)
 137                         if outs != test.out || !reflect.DeepEqual(err, test.err) {
 138                                 t.Errorf("AtofN(%v, 32) = %v, %v want %v, %v  # %v",
 139                                         test.in, out32, err, test.out, test.err, out)
 140                         }
 141                 }
 142
 143                 if FloatSize == 64 || float64(float32(out)) == out {
 144                         outf, err := Atof(test.in)
 145                         outs := Ftoa(outf, 'g', -1)
 146                         if outs != test.out || !reflect.DeepEqual(err, test.err) {
 147                                 t.Errorf("Ftoa(%v) = %v, %v want %v, %v  # %v",
 148                                         test.in, outf, err, test.out, test.err, out)
 149                         }
 150                 }
 151         }
 152         SetOptimize(oldopt)
 153 }
 154
 155 func TestAtof(t *testing.T) { testAtof(t, true) }
 156
 157 func TestAtofSlow(t *testing.T) { testAtof(t, false) }
 158
 159 func BenchmarkAtofDecimal(b *testing.B) {
 160         for i := 0; i < b.N; i++ {
 161                 Atof("33909")
 162         }
 163 }
 164
 165 func BenchmarkAtofFloat(b *testing.B) {
 166         for i := 0; i < b.N; i++ {
 167                 Atof("339.7784")
 168         }
 169 }
 170
 171 func BenchmarkAtofFloatExp(b *testing.B) {
 172         for i := 0; i < b.N; i++ {
 173                 Atof("-5.09e75")
 174         }
 175 }
 176
 177 func BenchmarkAtofBig(b *testing.B) {
 178         for i := 0; i < b.N; i++ {
 179                 Atof("123456789123456789123456789")
 180         }
 181 }