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117 lines
3.5 KiB
117 lines
3.5 KiB
// ------------------------------------------------------------------------
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// Project active2
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// Active Thing (activething.com) git.activething.com/go
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//
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// File name snake.go
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// Created by DEV
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// Modified 31/03/2024
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//
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// Copyright 2024 activething.com
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// ------------------------------------------------------------------------
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// ------------------------------------------------------------------------
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// https://github.com/iancoleman/strcase/blob/v0.3.0/snake.go
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package astrings
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import "strings"
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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, '_')
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}
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func ToSnakeWithIgnore(s string, ignore string) string {
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return ToScreamingDelimited(s, '_', ignore, 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 ToScreamingDelimited(s, '_', "", true)
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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, '-')
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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 ToScreamingDelimited(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) string {
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return ToScreamingDelimited(s, delimiter, "", false)
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}
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// ToScreamingDelimited converts a string to SCREAMING.DELIMITED.SNAKE.CASE
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// (in this case `delimiter = '.'; screaming = true`)
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// or delimited.snake.case
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// (in this case `delimiter = '.'; screaming = false`)
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func ToScreamingDelimited(s string, delimiter uint8, ignore string, 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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prevIgnore := ignore != "" && i > 0 && strings.ContainsAny(string(s[i-1]), ignore)
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if !prevIgnore {
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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 || vIsNum || nextIsNum {
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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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}
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if (v == ' ' || v == '_' || v == '-' || v == '.') && !strings.ContainsAny(string(v), ignore) {
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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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} |