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// Copyright © 2014 Steve Francia <spf@spf13.com>.
//
// Use of this source code is governed by an MIT-style
// license that can be found in the LICENSE file.
package cast
import (
"regexp"
"strconv"
"strings"
"testing"
qt "github.com/frankban/quicktest"
)
func BenchmarkToInt(b *testing.B) {
convert := func(num52 interface{}) {
if v := ToInt(num52); v != 52 {
b.Fatalf("ToInt returned wrong value, got %d, want %d", v, 32)
}
}
for i := 0; i < b.N; i++ {
convert("52")
convert(52.0)
convert(uint64(52))
}
}
func BenchmarkTrimZeroDecimal(b *testing.B) {
for i := 0; i < b.N; i++ {
trimZeroDecimal("")
trimZeroDecimal("123")
trimZeroDecimal("120")
trimZeroDecimal("120.00")
}
}
func TestTrimZeroDecimal(t *testing.T) {
c := qt.New(t)
c.Assert(trimZeroDecimal("10.0"), qt.Equals, "10")
c.Assert(trimZeroDecimal("10.00"), qt.Equals, "10")
c.Assert(trimZeroDecimal("10.010"), qt.Equals, "10.010")
c.Assert(trimZeroDecimal("0.0000000000"), qt.Equals, "0")
c.Assert(trimZeroDecimal("0.00000000001"), qt.Equals, "0.00000000001")
}
func TestTrimDecimal(t *testing.T) {
testCases := []struct {
input string
expected string
}{
{"10.0", "10"},
{"10.010", "10"},
{"00000.00001", "00000"},
{"-0001.0", "-0001"},
{".5", "0"},
{"+12.", "+12"},
{"+.25", "+0"},
{"-.25", "-0"},
{"0.0000000000", "0"},
{"0.0000000001", "0"},
{"10.0000000000", "10"},
{"10.0000000001", "10"},
{"10000000000000.0000000000", "10000000000000"},
{"10...17", "10...17"},
{"10.foobar", "10.foobar"},
{"10.0i", "10.0i"},
{"10.0E9", "10.0E9"},
}
for _, testCase := range testCases {
// TODO: remove after minimum Go version is >=1.22
testCase := testCase
t.Run(testCase.input, func(t *testing.T) {
c := qt.New(t)
c.Assert(trimDecimal(testCase.input), qt.Equals, testCase.expected)
})
}
}
// Analysis (in the order of performance):
//
// - Trimming decimals based on decimal point yields a lot of incorrectly parsed values.
// - Parsing to float might be better, but we still need to cast the number, it might overflow, problematic.
// - Regex parsing is an order of magnitude slower, but it yields correct results.
func BenchmarkDecimal(b *testing.B) {
testCases := []struct {
input string
expectError bool
}{
{"10.0", false},
{"10.00", false},
{"10.010", false},
{"0.0000000000", false},
{"0.0000000001", false},
{"10.0000000000", false},
{"10.0000000001", false},
{"10000000000000.0000000000", false},
// {"10...17", true},
// {"10.foobar", true},
// {"10.0i", true},
// {"10.0E9", true},
}
trimDecimalString := func(s string) string {
// trim the decimal part (if any)
if i := strings.Index(s, "."); i >= 0 {
s = s[:i]
}
return s
}
re := regexp.MustCompile(`^([-+]?\d*)(\.\d*)?$`)
trimDecimalRegex := func(s string) string {
matches := re.FindStringSubmatch(s)
if matches != nil {
// matches[1] is the captured integer part with sign
return matches[1]
}
return s
}
for _, testCase := range testCases {
// TODO: remove after minimum Go version is >=1.22
testCase := testCase
b.Run(testCase.input, func(b *testing.B) {
b.Run("ParseFloat", func(b *testing.B) {
// TODO: use b.Loop() once updated to Go 1.24
for i := 0; i < b.N; i++ {
v, err := strconv.ParseFloat(testCase.input, 64)
if (err != nil) != testCase.expectError {
if err != nil {
b.Fatal(err)
}
b.Fatal("expected error, but got none")
}
n := int64(v)
_ = n
}
})
b.Run("TrimDecimalString", func(b *testing.B) {
// TODO: use b.Loop() once updated to Go 1.24
for i := 0; i < b.N; i++ {
v, err := strconv.ParseInt(trimDecimalString(testCase.input), 0, 0)
if (err != nil) != testCase.expectError {
if err != nil {
b.Fatal(err)
}
b.Fatal("expected error, but got none")
}
_ = v
}
})
b.Run("TrimDecimalRegex", func(b *testing.B) {
// TODO: use b.Loop() once updated to Go 1.24
for i := 0; i < b.N; i++ {
v, err := strconv.ParseInt(trimDecimalRegex(testCase.input), 0, 0)
if (err != nil) != testCase.expectError {
if err != nil {
b.Fatal(err)
}
b.Fatal("expected error, but got none")
}
_ = v
}
})
})
}
}
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