102 lines
3.2 KiB
Go
102 lines
3.2 KiB
Go
/*
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* The MIT License (MIT)
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*
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* Copyright (c) 2015 Ian Coleman
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* Copyright (c) 2018 Ma_124, <github.com/Ma124>
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* Copyright (c) 2022 Cosmos SDK Developers, <github.com/cosmos/cosmos-sdk>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, Subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or Substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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package strcase
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import (
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"strings"
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)
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// ToKebab converts a string to kebab-case
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func ToKebab(s string) string {
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return ToDelimited(s, '-', false)
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}
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// ToScreamingKebab converts a string to SCREAMING-KEBAB-CASE
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func ToScreamingKebab(s string) string {
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return ToDelimited(s, '-', true)
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}
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// ToSnake converts a string to snake_case
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func ToSnake(s string) string {
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return ToDelimited(s, '_', false)
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}
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// ToScreamingSnake converts a string to SCREAMING_SNAKE_CASE
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func ToScreamingSnake(s string) string {
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return ToDelimited(s, '_', true)
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}
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// ToDelimited converts a string to delimited.snake.case
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// (in this case `delimiter = '.'`)
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func ToDelimited(s string, delimiter uint8, screaming bool) string {
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s = strings.TrimSpace(s)
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n := strings.Builder{}
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n.Grow(len(s) + 2) // nominal 2 bytes of extra space for inserted delimiters
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for i, v := range []byte(s) {
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vIsCap := v >= 'A' && v <= 'Z'
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vIsLow := v >= 'a' && v <= 'z'
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if vIsLow && screaming {
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v += 'A'
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v -= 'a'
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} else if vIsCap && !screaming {
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v += 'a'
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v -= 'A'
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}
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// treat acronyms as words, eg for JSONData -> JSON is a whole word
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if i+1 < len(s) {
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next := s[i+1]
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vIsNum := v >= '0' && v <= '9'
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nextIsCap := next >= 'A' && next <= 'Z'
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nextIsLow := next >= 'a' && next <= 'z'
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nextIsNum := next >= '0' && next <= '9'
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// add underscore if next letter case type is changed
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if (vIsCap && (nextIsLow || nextIsNum)) || (vIsLow && (nextIsCap || nextIsNum)) || (vIsNum && (nextIsCap || nextIsLow)) {
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if vIsCap && nextIsLow {
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if prevIsCap := i > 0 && s[i-1] >= 'A' && s[i-1] <= 'Z'; prevIsCap {
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n.WriteByte(delimiter)
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}
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}
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n.WriteByte(v)
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if (vIsLow && nextIsCap) || (vIsNum && nextIsCap) || (vIsNum && nextIsLow) {
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n.WriteByte(delimiter)
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}
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continue
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}
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}
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if v == ' ' || v == '_' || v == '-' || v == '.' {
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// replace space/underscore/hyphen/dot with delimiter
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n.WriteByte(delimiter)
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} else {
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n.WriteByte(v)
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}
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}
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return n.String()
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}
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