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Source file src/strconv/atoi_test.go

Documentation: strconv

  // 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 (
  	"errors"
  	"fmt"
  	"reflect"
  	. "strconv"
  	"testing"
  )
  
  type parseUint64Test struct {
  	in  string
  	out uint64
  	err error
  }
  
  var parseUint64Tests = []parseUint64Test{
  	{"", 0, ErrSyntax},
  	{"0", 0, nil},
  	{"1", 1, nil},
  	{"12345", 12345, nil},
  	{"012345", 12345, nil},
  	{"12345x", 0, ErrSyntax},
  	{"98765432100", 98765432100, nil},
  	{"18446744073709551615", 1<<64 - 1, nil},
  	{"18446744073709551616", 1<<64 - 1, ErrRange},
  	{"18446744073709551620", 1<<64 - 1, ErrRange},
  }
  
  type parseUint64BaseTest struct {
  	in   string
  	base int
  	out  uint64
  	err  error
  }
  
  var parseUint64BaseTests = []parseUint64BaseTest{
  	{"", 0, 0, ErrSyntax},
  	{"0", 0, 0, nil},
  	{"0x", 0, 0, ErrSyntax},
  	{"0X", 0, 0, ErrSyntax},
  	{"1", 0, 1, nil},
  	{"12345", 0, 12345, nil},
  	{"012345", 0, 012345, nil},
  	{"0x12345", 0, 0x12345, nil},
  	{"0X12345", 0, 0x12345, nil},
  	{"12345x", 0, 0, ErrSyntax},
  	{"0xabcdefg123", 0, 0, ErrSyntax},
  	{"123456789abc", 0, 0, ErrSyntax},
  	{"98765432100", 0, 98765432100, nil},
  	{"18446744073709551615", 0, 1<<64 - 1, nil},
  	{"18446744073709551616", 0, 1<<64 - 1, ErrRange},
  	{"18446744073709551620", 0, 1<<64 - 1, ErrRange},
  	{"0xFFFFFFFFFFFFFFFF", 0, 1<<64 - 1, nil},
  	{"0x10000000000000000", 0, 1<<64 - 1, ErrRange},
  	{"01777777777777777777777", 0, 1<<64 - 1, nil},
  	{"01777777777777777777778", 0, 0, ErrSyntax},
  	{"02000000000000000000000", 0, 1<<64 - 1, ErrRange},
  	{"0200000000000000000000", 0, 1 << 61, nil},
  }
  
  type parseInt64Test struct {
  	in  string
  	out int64
  	err error
  }
  
  var parseInt64Tests = []parseInt64Test{
  	{"", 0, ErrSyntax},
  	{"0", 0, nil},
  	{"-0", 0, nil},
  	{"1", 1, nil},
  	{"-1", -1, nil},
  	{"12345", 12345, nil},
  	{"-12345", -12345, nil},
  	{"012345", 12345, nil},
  	{"-012345", -12345, nil},
  	{"98765432100", 98765432100, nil},
  	{"-98765432100", -98765432100, nil},
  	{"9223372036854775807", 1<<63 - 1, nil},
  	{"-9223372036854775807", -(1<<63 - 1), nil},
  	{"9223372036854775808", 1<<63 - 1, ErrRange},
  	{"-9223372036854775808", -1 << 63, nil},
  	{"9223372036854775809", 1<<63 - 1, ErrRange},
  	{"-9223372036854775809", -1 << 63, ErrRange},
  }
  
  type parseInt64BaseTest struct {
  	in   string
  	base int
  	out  int64
  	err  error
  }
  
  var parseInt64BaseTests = []parseInt64BaseTest{
  	{"", 0, 0, ErrSyntax},
  	{"0", 0, 0, nil},
  	{"-0", 0, 0, nil},
  	{"1", 0, 1, nil},
  	{"-1", 0, -1, nil},
  	{"12345", 0, 12345, nil},
  	{"-12345", 0, -12345, nil},
  	{"012345", 0, 012345, nil},
  	{"-012345", 0, -012345, nil},
  	{"0x12345", 0, 0x12345, nil},
  	{"-0X12345", 0, -0x12345, nil},
  	{"12345x", 0, 0, ErrSyntax},
  	{"-12345x", 0, 0, ErrSyntax},
  	{"98765432100", 0, 98765432100, nil},
  	{"-98765432100", 0, -98765432100, nil},
  	{"9223372036854775807", 0, 1<<63 - 1, nil},
  	{"-9223372036854775807", 0, -(1<<63 - 1), nil},
  	{"9223372036854775808", 0, 1<<63 - 1, ErrRange},
  	{"-9223372036854775808", 0, -1 << 63, nil},
  	{"9223372036854775809", 0, 1<<63 - 1, ErrRange},
  	{"-9223372036854775809", 0, -1 << 63, ErrRange},
  
  	// other bases
  	{"g", 17, 16, nil},
  	{"10", 25, 25, nil},
  	{"holycow", 35, (((((17*35+24)*35+21)*35+34)*35+12)*35+24)*35 + 32, nil},
  	{"holycow", 36, (((((17*36+24)*36+21)*36+34)*36+12)*36+24)*36 + 32, nil},
  
  	// base 2
  	{"0", 2, 0, nil},
  	{"-1", 2, -1, nil},
  	{"1010", 2, 10, nil},
  	{"1000000000000000", 2, 1 << 15, nil},
  	{"111111111111111111111111111111111111111111111111111111111111111", 2, 1<<63 - 1, nil},
  	{"1000000000000000000000000000000000000000000000000000000000000000", 2, 1<<63 - 1, ErrRange},
  	{"-1000000000000000000000000000000000000000000000000000000000000000", 2, -1 << 63, nil},
  	{"-1000000000000000000000000000000000000000000000000000000000000001", 2, -1 << 63, ErrRange},
  
  	// base 8
  	{"-10", 8, -8, nil},
  	{"57635436545", 8, 057635436545, nil},
  	{"100000000", 8, 1 << 24, nil},
  
  	// base 16
  	{"10", 16, 16, nil},
  	{"-123456789abcdef", 16, -0x123456789abcdef, nil},
  	{"7fffffffffffffff", 16, 1<<63 - 1, nil},
  }
  
  type parseUint32Test struct {
  	in  string
  	out uint32
  	err error
  }
  
  var parseUint32Tests = []parseUint32Test{
  	{"", 0, ErrSyntax},
  	{"0", 0, nil},
  	{"1", 1, nil},
  	{"12345", 12345, nil},
  	{"012345", 12345, nil},
  	{"12345x", 0, ErrSyntax},
  	{"987654321", 987654321, nil},
  	{"4294967295", 1<<32 - 1, nil},
  	{"4294967296", 1<<32 - 1, ErrRange},
  }
  
  type parseInt32Test struct {
  	in  string
  	out int32
  	err error
  }
  
  var parseInt32Tests = []parseInt32Test{
  	{"", 0, ErrSyntax},
  	{"0", 0, nil},
  	{"-0", 0, nil},
  	{"1", 1, nil},
  	{"-1", -1, nil},
  	{"12345", 12345, nil},
  	{"-12345", -12345, nil},
  	{"012345", 12345, nil},
  	{"-012345", -12345, nil},
  	{"12345x", 0, ErrSyntax},
  	{"-12345x", 0, ErrSyntax},
  	{"987654321", 987654321, nil},
  	{"-987654321", -987654321, nil},
  	{"2147483647", 1<<31 - 1, nil},
  	{"-2147483647", -(1<<31 - 1), nil},
  	{"2147483648", 1<<31 - 1, ErrRange},
  	{"-2147483648", -1 << 31, nil},
  	{"2147483649", 1<<31 - 1, ErrRange},
  	{"-2147483649", -1 << 31, ErrRange},
  }
  
  type numErrorTest struct {
  	num, want string
  }
  
  var numErrorTests = []numErrorTest{
  	{"0", `strconv.ParseFloat: parsing "0": failed`},
  	{"`", "strconv.ParseFloat: parsing \"`\": failed"},
  	{"1\x00.2", `strconv.ParseFloat: parsing "1\x00.2": failed`},
  }
  
  func init() {
  	// The parse routines return NumErrors wrapping
  	// the error and the string. Convert the tables above.
  	for i := range parseUint64Tests {
  		test := &parseUint64Tests[i]
  		if test.err != nil {
  			test.err = &NumError{"ParseUint", test.in, test.err}
  		}
  	}
  	for i := range parseUint64BaseTests {
  		test := &parseUint64BaseTests[i]
  		if test.err != nil {
  			test.err = &NumError{"ParseUint", test.in, test.err}
  		}
  	}
  	for i := range parseInt64Tests {
  		test := &parseInt64Tests[i]
  		if test.err != nil {
  			test.err = &NumError{"ParseInt", test.in, test.err}
  		}
  	}
  	for i := range parseInt64BaseTests {
  		test := &parseInt64BaseTests[i]
  		if test.err != nil {
  			test.err = &NumError{"ParseInt", test.in, test.err}
  		}
  	}
  	for i := range parseUint32Tests {
  		test := &parseUint32Tests[i]
  		if test.err != nil {
  			test.err = &NumError{"ParseUint", test.in, test.err}
  		}
  	}
  	for i := range parseInt32Tests {
  		test := &parseInt32Tests[i]
  		if test.err != nil {
  			test.err = &NumError{"ParseInt", test.in, test.err}
  		}
  	}
  }
  
  func TestParseUint32(t *testing.T) {
  	for i := range parseUint32Tests {
  		test := &parseUint32Tests[i]
  		out, err := ParseUint(test.in, 10, 32)
  		if uint64(test.out) != out || !reflect.DeepEqual(test.err, err) {
  			t.Errorf("ParseUint(%q, 10, 32) = %v, %v want %v, %v",
  				test.in, out, err, test.out, test.err)
  		}
  	}
  }
  
  func TestParseUint64(t *testing.T) {
  	for i := range parseUint64Tests {
  		test := &parseUint64Tests[i]
  		out, err := ParseUint(test.in, 10, 64)
  		if test.out != out || !reflect.DeepEqual(test.err, err) {
  			t.Errorf("ParseUint(%q, 10, 64) = %v, %v want %v, %v",
  				test.in, out, err, test.out, test.err)
  		}
  	}
  }
  
  func TestParseUint64Base(t *testing.T) {
  	for i := range parseUint64BaseTests {
  		test := &parseUint64BaseTests[i]
  		out, err := ParseUint(test.in, test.base, 64)
  		if test.out != out || !reflect.DeepEqual(test.err, err) {
  			t.Errorf("ParseUint(%q, %v, 64) = %v, %v want %v, %v",
  				test.in, test.base, out, err, test.out, test.err)
  		}
  	}
  }
  
  func TestParseInt32(t *testing.T) {
  	for i := range parseInt32Tests {
  		test := &parseInt32Tests[i]
  		out, err := ParseInt(test.in, 10, 32)
  		if int64(test.out) != out || !reflect.DeepEqual(test.err, err) {
  			t.Errorf("ParseInt(%q, 10 ,32) = %v, %v want %v, %v",
  				test.in, out, err, test.out, test.err)
  		}
  	}
  }
  
  func TestParseInt64(t *testing.T) {
  	for i := range parseInt64Tests {
  		test := &parseInt64Tests[i]
  		out, err := ParseInt(test.in, 10, 64)
  		if test.out != out || !reflect.DeepEqual(test.err, err) {
  			t.Errorf("ParseInt(%q, 10, 64) = %v, %v want %v, %v",
  				test.in, out, err, test.out, test.err)
  		}
  	}
  }
  
  func TestParseInt64Base(t *testing.T) {
  	for i := range parseInt64BaseTests {
  		test := &parseInt64BaseTests[i]
  		out, err := ParseInt(test.in, test.base, 64)
  		if test.out != out || !reflect.DeepEqual(test.err, err) {
  			t.Errorf("ParseInt(%q, %v, 64) = %v, %v want %v, %v",
  				test.in, test.base, out, err, test.out, test.err)
  		}
  	}
  }
  
  func TestParseUint(t *testing.T) {
  	switch IntSize {
  	case 32:
  		for i := range parseUint32Tests {
  			test := &parseUint32Tests[i]
  			out, err := ParseUint(test.in, 10, 0)
  			if uint64(test.out) != out || !reflect.DeepEqual(test.err, err) {
  				t.Errorf("ParseUint(%q, 10, 0) = %v, %v want %v, %v",
  					test.in, out, err, test.out, test.err)
  			}
  		}
  	case 64:
  		for i := range parseUint64Tests {
  			test := &parseUint64Tests[i]
  			out, err := ParseUint(test.in, 10, 0)
  			if test.out != out || !reflect.DeepEqual(test.err, err) {
  				t.Errorf("ParseUint(%q, 10, 0) = %v, %v want %v, %v",
  					test.in, out, err, test.out, test.err)
  			}
  		}
  	}
  }
  
  func TestParseInt(t *testing.T) {
  	switch IntSize {
  	case 32:
  		for i := range parseInt32Tests {
  			test := &parseInt32Tests[i]
  			out, err := ParseInt(test.in, 10, 0)
  			if int64(test.out) != out || !reflect.DeepEqual(test.err, err) {
  				t.Errorf("ParseInt(%q, 10, 0) = %v, %v want %v, %v",
  					test.in, out, err, test.out, test.err)
  			}
  		}
  	case 64:
  		for i := range parseInt64Tests {
  			test := &parseInt64Tests[i]
  			out, err := ParseInt(test.in, 10, 0)
  			if test.out != out || !reflect.DeepEqual(test.err, err) {
  				t.Errorf("ParseInt(%q, 10, 0) = %v, %v want %v, %v",
  					test.in, out, err, test.out, test.err)
  			}
  		}
  	}
  }
  
  func TestAtoi(t *testing.T) {
  	switch IntSize {
  	case 32:
  		for i := range parseInt32Tests {
  			test := &parseInt32Tests[i]
  			out, err := Atoi(test.in)
  			var testErr error
  			if test.err != nil {
  				testErr = &NumError{"Atoi", test.in, test.err.(*NumError).Err}
  			}
  			if int(test.out) != out || !reflect.DeepEqual(testErr, err) {
  				t.Errorf("Atoi(%q) = %v, %v want %v, %v",
  					test.in, out, err, test.out, testErr)
  			}
  		}
  	case 64:
  		for i := range parseInt64Tests {
  			test := &parseInt64Tests[i]
  			out, err := Atoi(test.in)
  			var testErr error
  			if test.err != nil {
  				testErr = &NumError{"Atoi", test.in, test.err.(*NumError).Err}
  			}
  			if test.out != int64(out) || !reflect.DeepEqual(testErr, err) {
  				t.Errorf("Atoi(%q) = %v, %v want %v, %v",
  					test.in, out, err, test.out, testErr)
  			}
  		}
  	}
  }
  
  func bitSizeErrStub(name string, bitSize int) error {
  	return BitSizeError(name, "0", bitSize)
  }
  
  func baseErrStub(name string, base int) error {
  	return BaseError(name, "0", base)
  }
  
  func noErrStub(name string, arg int) error {
  	return nil
  }
  
  type parseErrorTest struct {
  	arg     int
  	errStub func(name string, arg int) error
  }
  
  var parseBitSizeTests = []parseErrorTest{
  	{-1, bitSizeErrStub},
  	{0, noErrStub},
  	{64, noErrStub},
  	{65, bitSizeErrStub},
  }
  
  var parseBaseTests = []parseErrorTest{
  	{-1, baseErrStub},
  	{0, noErrStub},
  	{1, baseErrStub},
  	{2, noErrStub},
  	{36, noErrStub},
  	{37, baseErrStub},
  }
  
  func TestParseIntBitSize(t *testing.T) {
  	for i := range parseBitSizeTests {
  		test := &parseBitSizeTests[i]
  		testErr := test.errStub("ParseInt", test.arg)
  		_, err := ParseInt("0", 0, test.arg)
  		if !reflect.DeepEqual(testErr, err) {
  			t.Errorf("ParseInt(\"0\", 0, %v) = 0, %v want 0, %v",
  				test.arg, err, testErr)
  		}
  	}
  }
  
  func TestParseUintBitSize(t *testing.T) {
  	for i := range parseBitSizeTests {
  		test := &parseBitSizeTests[i]
  		testErr := test.errStub("ParseUint", test.arg)
  		_, err := ParseUint("0", 0, test.arg)
  		if !reflect.DeepEqual(testErr, err) {
  			t.Errorf("ParseUint(\"0\", 0, %v) = 0, %v want 0, %v",
  				test.arg, err, testErr)
  		}
  	}
  }
  
  func TestParseIntBase(t *testing.T) {
  	for i := range parseBaseTests {
  		test := &parseBaseTests[i]
  		testErr := test.errStub("ParseInt", test.arg)
  		_, err := ParseInt("0", test.arg, 0)
  		if !reflect.DeepEqual(testErr, err) {
  			t.Errorf("ParseInt(\"0\", %v, 0) = 0, %v want 0, %v",
  				test.arg, err, testErr)
  		}
  	}
  }
  
  func TestParseUintBase(t *testing.T) {
  	for i := range parseBaseTests {
  		test := &parseBaseTests[i]
  		testErr := test.errStub("ParseUint", test.arg)
  		_, err := ParseUint("0", test.arg, 0)
  		if !reflect.DeepEqual(testErr, err) {
  			t.Errorf("ParseUint(\"0\", %v, 0) = 0, %v want 0, %v",
  				test.arg, err, testErr)
  		}
  	}
  }
  
  func TestNumError(t *testing.T) {
  	for _, test := range numErrorTests {
  		err := &NumError{
  			Func: "ParseFloat",
  			Num:  test.num,
  			Err:  errors.New("failed"),
  		}
  		if got := err.Error(); got != test.want {
  			t.Errorf(`(&NumError{"ParseFloat", %q, "failed"}).Error() = %v, want %v`, test.num, got, test.want)
  		}
  	}
  }
  
  func BenchmarkParseInt(b *testing.B) {
  	b.Run("Pos", func(b *testing.B) {
  		benchmarkParseInt(b, 1)
  	})
  	b.Run("Neg", func(b *testing.B) {
  		benchmarkParseInt(b, -1)
  	})
  }
  
  type benchCase struct {
  	name string
  	num  int64
  }
  
  func benchmarkParseInt(b *testing.B, neg int) {
  	cases := []benchCase{
  		{"7bit", 1<<7 - 1},
  		{"26bit", 1<<26 - 1},
  		{"31bit", 1<<31 - 1},
  		{"56bit", 1<<56 - 1},
  		{"63bit", 1<<63 - 1},
  	}
  	for _, cs := range cases {
  		b.Run(cs.name, func(b *testing.B) {
  			s := fmt.Sprintf("%d", cs.num*int64(neg))
  			for i := 0; i < b.N; i++ {
  				out, _ := ParseInt(s, 10, 64)
  				BenchSink += int(out)
  			}
  		})
  	}
  }
  
  func BenchmarkAtoi(b *testing.B) {
  	b.Run("Pos", func(b *testing.B) {
  		benchmarkAtoi(b, 1)
  	})
  	b.Run("Neg", func(b *testing.B) {
  		benchmarkAtoi(b, -1)
  	})
  }
  
  func benchmarkAtoi(b *testing.B, neg int) {
  	cases := []benchCase{
  		{"7bit", 1<<7 - 1},
  		{"26bit", 1<<26 - 1},
  		{"31bit", 1<<31 - 1},
  	}
  	if IntSize == 64 {
  		cases = append(cases, []benchCase{
  			{"56bit", 1<<56 - 1},
  			{"63bit", 1<<63 - 1},
  		}...)
  	}
  	for _, cs := range cases {
  		b.Run(cs.name, func(b *testing.B) {
  			s := fmt.Sprintf("%d", cs.num*int64(neg))
  			for i := 0; i < b.N; i++ {
  				out, _ := Atoi(s)
  				BenchSink += out
  			}
  		})
  	}
  }
  

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