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50 lines
1.9 KiB
50 lines
1.9 KiB
5 months ago
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var toValueString = require('./toValueString')
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var helperStringSubstring = require('./helperStringSubstring')
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var helperStringLowerCase = require('./helperStringLowerCase')
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var kebabCacheMaps = {}
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/**
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* 将带驼峰字符串转成字符串,例如： projectName 转为 project-name
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*
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* @param {String} str 字符串
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* @return {String}
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*/
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function kebabCase (str) {
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str = toValueString(str)
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if (kebabCacheMaps[str]) {
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return kebabCacheMaps[str]
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}
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if (/^[A-Z]+$/.test(str)) {
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return helperStringLowerCase(str)
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}
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var rest = str.replace(/^([a-z])([A-Z]+)([a-z]+)$/, function (text, prevLower, upper, nextLower) {
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var upperLen = upper.length
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if (upperLen > 1) {
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return prevLower + '-' + helperStringLowerCase(helperStringSubstring(upper, 0, upperLen - 1)) + '-' + helperStringLowerCase(helperStringSubstring(upper, upperLen - 1, upperLen)) + nextLower
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}
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return helperStringLowerCase(prevLower + '-' + upper + nextLower)
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}).replace(/^([A-Z]+)([a-z]+)?$/, function (text, upper, nextLower) {
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var upperLen = upper.length
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return helperStringLowerCase(helperStringSubstring(upper, 0, upperLen - 1) + '-' + helperStringSubstring(upper, upperLen - 1, upperLen) + (nextLower || ''))
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}).replace(/([a-z]?)([A-Z]+)([a-z]?)/g, function (text, prevLower, upper, nextLower, index) {
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var upperLen = upper.length
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if (upperLen > 1) {
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if (prevLower) {
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prevLower += '-'
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}
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if (nextLower) {
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return (prevLower || '') + helperStringLowerCase(helperStringSubstring(upper, 0, upperLen - 1)) + '-' + helperStringLowerCase(helperStringSubstring(upper, upperLen - 1, upperLen)) + nextLower
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}
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}
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return (prevLower || '') + (index ? '-' : '') + helperStringLowerCase(upper) + (nextLower || '')
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})
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rest = rest.replace(/([-]+)/g, function (text, flag, index) {
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return index && index + flag.length < rest.length ? '-' : ''
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})
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kebabCacheMaps[str] = rest
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return rest
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}
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module.exports = kebabCase
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