✨ feat: strutil - add new base conv func: BaseConv, Base10Conv, BaseC…

…onvByTpl

strutil/convbase.go

@@ -0,0 +1,81 @@
+package strutil
+
+import (
+	"strconv"
+	"strings"
+
+	"github.com/gookit/goutil/basefn"
+)
+
+//
+// -------------------- convert base --------------------
+//
+
+const (
+	Base10Chars = "0123456789"
+	Base16Chars = "0123456789abcdef"
+	Base32Chars = "0123456789abcdefghjkmnpqrstvwxyz"
+	Base36Chars = "0123456789abcdefghijklmnopqrstuvwxyz"
+	Base62Chars = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+	Base64Chars = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ+/"
+)
+
+// Base10Conv convert base 10 string to new base string.
+func Base10Conv(src string, to int) string {
+	return BaseConv(src, 10, to)
+}
+
+// BaseConv convert base string by from and to base.
+//
+// Note: from and to base must be in [2, 64]
+//
+// Usage:
+//
+//	BaseConv("123", 10, 16) // Output: "7b"
+//	BaseConv("7b", 16, 10) // Output: "123"
+func BaseConv(src string, from, to int) string {
+	if from > 64 || from < 2 {
+		return ""
+	}
+	if to > 64 || to < 2 {
+		return ""
+	}
+
+	return BaseConvByTpl(src, Base64Chars[:from], Base64Chars[:to])
+}
+
+// BaseConvByTpl convert base string by template.
+//
+// Usage:
+//
+//	BaseConvert("123", Base62Chars, Base16Chars) // Output: "1e"
+//	BaseConvert("1e", Base16Chars, Base62Chars) // Output: "123"
+func BaseConvByTpl(src string, fromBase, toBase string) string {
+	if fromBase == toBase {
+		return src
+	}
+
+	// convert to base 10
+	var dec uint64 = 0
+	if fromBase == Base10Chars {
+		var err error
+		dec, err = strconv.ParseUint(src, 10, 0)
+		if err != nil {
+			basefn.Panicf("input is not a valid decimal number: %s", src)
+		}
+	} else {
+		fLen := uint64(len(fromBase))
+		for _, c := range src {
+			dec = dec*fLen + uint64(strings.IndexRune(fromBase, c))
+		}
+	}
+
+	// convert to new base
+	var res string
+	toLen := uint64(len(toBase))
+	for dec > 0 {
+		res = string(toBase[dec%toLen]) + res
+		dec /= toLen
+	}
+	return res
+}

strutil/convbase_test.go

@@ -0,0 +1,79 @@
+package strutil_test
+
+import (
+	"testing"
+
+	"github.com/gookit/goutil/strutil"
+	"github.com/gookit/goutil/testutil/assert"
+)
+
+func TestBaseConv(t *testing.T) {
+	tests := []struct {
+		give string
+		from int
+		to   int
+		want string
+	}{
+		// 10 -> 16
+		{"123", 10, 16, "7b"},
+		{"7b", 16, 10, "123"},
+		// 10 -> 32
+		{"123", 10, 32, "3r"},
+		{"3r", 32, 10, "123"},
+		// 10 -> 62
+		{"123", 10, 62, "1Z"},
+		{"1Z", 62, 10, "123"},
+		// 10 -> 64
+		{"123", 10, 64, "1X"},
+		{"1X", 64, 10, "123"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.give, func(t *testing.T) {
+			got := strutil.BaseConv(tt.give, tt.from, tt.to)
+			if got != tt.want {
+				t.Errorf("BaseConv() got = %v, want %v; give=%s", got, tt.want, tt.give)
+			}
+		})
+	}
+}
+
+func TestBase10Conv(t *testing.T) {
+	// fmt.Println(time.Now().Format("20060102150405"))
+	date := "20230829194900" // seconds
+	t.Run("date sec", func(t *testing.T) {
+		base16 := strutil.Base10Conv(date, 16)
+		assert.Eq(t, "12665b633e94", base16)
+
+		base32 := strutil.Base10Conv(date, 32)
+		assert.Eq(t, "icpdm6fkk", base32)
+
+		base62 := strutil.Base10Conv(date, 62)
+		assert.Eq(t, "5KaR3zRW", base62)
+
+		base64 := strutil.Base10Conv(date, 64)
+		assert.Eq(t, "4CproPWk", base64)
+	})
+
+	// fmt.Println(time.Now().Format("20060102150405.000"))
+	msDate := "20230829195105843"
+	t.Run("date ms", func(t *testing.T) {
+		base16 := strutil.Base10Conv(msDate, 16)
+		assert.Eq(t, "47dfd4fbaf9633", base16)
+
+		base32 := strutil.Base10Conv(msDate, 32)
+		assert.Eq(t, "huvqjtqv5hj", base32)
+
+		base62 := strutil.Base10Conv(msDate, 62)
+		assert.Eq(t, "1uEL5LJptx", base62)
+
+		base64 := strutil.Base10Conv(msDate, 64)
+		assert.Eq(t, "17TZjXHVoP", base64)
+	})
+
+	t.Run("panic", func(t *testing.T) {
+		assert.Panics(t, func() {
+			strutil.Base10Conv("invalid", 16)
+		})
+	})
+}