publish lancet

strutil/string.go

@@ -0,0 +1,217 @@
+// Copyright 2021 dudaodong@gmail.com. All rights reserved.
+// Use of this source code is governed by MIT license
+
+// Package strutil implements some functions to manipulate string.
+package strutil
+
+import (
+	"regexp"
+	"strings"
+)
+
+// CamelCase covert string to camelCase string.
+func CamelCase(s string) string {
+	if len(s) == 0 {
+		return ""
+	}
+
+	res := ""
+	blankSpace := " "
+	regex, _ := regexp.Compile("[-_&]+")
+	ss := regex.ReplaceAllString(s, blankSpace)
+	for i, v := range strings.Split(ss, blankSpace) {
+		vv := []rune(v)
+		if i == 0 {
+			if vv[i] >= 65 && vv[i] <= 96 {
+				vv[0] += 32
+			}
+			res += string(vv)
+		} else {
+			res += Capitalize(v)
+		}
+	}
+
+	return res
+}
+
+// Capitalize converts the first character of a string to upper case and the remaining to lower case.
+func Capitalize(s string) string {
+	if len(s) == 0 {
+		return ""
+	}
+
+	res := ""
+	for i, v := range []rune(s) {
+		if i == 0 {
+			if v >= 97 && v <= 122 {
+				v -= 32
+			}
+			res += string(v)
+		} else {
+			res += strings.ToLower(string(v))
+		}
+	}
+	return res
+}
+
+// LowerFirst converts the first character of string to lower case.
+func LowerFirst(s string) string {
+	if len(s) == 0 {
+		return ""
+	}
+
+	res := ""
+	for i, v := range []rune(s) {
+		if i == 0 {
+			if v >= 65 && v <= 96 {
+				v += 32
+				res += string(v)
+			} else {
+				return s
+			}
+		} else {
+			res += string(v)
+		}
+	}
+	return res
+}
+
+// PadEnd pads string on the right side if it's shorter than size.
+// Padding characters are truncated if they exceed size.
+func PadEnd(source string, size int, padStr string) string {
+	len1 := len(source)
+	len2 := len(padStr)
+
+	if len1 >= size {
+		return source
+	}
+
+	fill := ""
+	if len2 >= size-len1 {
+		fill = padStr[0 : size-len1]
+	} else {
+		fill = strings.Repeat(padStr, size-len1)
+	}
+	return source + fill[0:size-len1]
+}
+
+// PadStart pads string on the left side if it's shorter than size.
+// Padding characters are truncated if they exceed size.
+func PadStart(source string, size int, padStr string) string {
+	len1 := len(source)
+	len2 := len(padStr)
+
+	if len1 >= size {
+		return source
+	}
+
+	fill := ""
+	if len2 >= size-len1 {
+		fill = padStr[0 : size-len1]
+	} else {
+		fill = strings.Repeat(padStr, size-len1)
+	}
+	return fill[0:size-len1] + source
+}
+
+// KebabCase covert string to kebab-case
+func KebabCase(s string) string {
+	if len(s) == 0 {
+		return ""
+	}
+
+	regex := regexp.MustCompile(`[\W|_]+`)
+	blankSpace := " "
+	match := regex.ReplaceAllString(s, blankSpace)
+	rs := strings.Split(match, blankSpace)
+
+	var res []string
+	for _, v := range rs {
+		splitWords := splitWordsToLower(v)
+		if len(splitWords) > 0 {
+			res = append(res, splitWords...)
+		}
+	}
+
+	return strings.Join(res, "-")
+}
+
+// SnakeCase covert string to snake_case
+func SnakeCase(s string) string {
+	if len(s) == 0 {
+		return ""
+	}
+
+	regex := regexp.MustCompile(`[\W|_]+`)
+	blankSpace := " "
+	match := regex.ReplaceAllString(s, blankSpace)
+	rs := strings.Split(match, blankSpace)
+
+	var res []string
+	for _, v := range rs {
+		splitWords := splitWordsToLower(v)
+		if len(splitWords) > 0 {
+			res = append(res, splitWords...)
+		}
+	}
+
+	return strings.Join(res, "_")
+}
+
+// Before create substring in source string before position when char first appear
+func Before(s, char string) string {
+	if s == "" || char == "" {
+		return s
+	}
+	i := strings.Index(s, char)
+	return s[0:i]
+}
+
+// BeforeLast create substring in source string before position when char last appear
+func BeforeLast(s, char string) string {
+	if s == "" || char == "" {
+		return s
+	}
+	i := strings.LastIndex(s, char)
+	return s[0:i]
+}
+
+// After create substring in source string after position when char first appear
+func After(s, char string) string {
+	if s == "" || char == "" {
+		return s
+	}
+	i := strings.Index(s, char)
+	return s[i+len(char):]
+}
+
+// AfterLast create substring in source string after position when char last appear
+func AfterLast(s, char string) string {
+	if s == "" || char == "" {
+		return s
+	}
+	i := strings.LastIndex(s, char)
+	return s[i+len(char):]
+}
+
+// IsString check if the value data type is string or not.
+func IsString(v interface{}) bool {
+	if v == nil {
+		return false
+	}
+	switch v.(type) {
+	case string:
+		return true
+	default:
+		return false
+	}
+}
+
+// ReverseStr return string whose char order is reversed to the given string
+func ReverseStr(s string) string {
+	r := []rune(s)
+	for i, j := 0, len(r)-1; i < j; i, j = i+1, j-1 {
+		r[i], r[j] = r[j], r[i]
+	}
+	return string(r)
+}