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var lowerCase = require('lower-case')
var NON_WORD_REGEXP = require('./vendor/non-word-regexp')
var CAMEL_CASE_REGEXP = require('./vendor/camel-case-regexp')
var CAMEL_CASE_UPPER_REGEXP = require('./vendor/camel-case-upper-regexp')
/**
* Sentence case a string.
*
* @param {string} str
* @param {string} locale
* @param {string} replacement
* @return {string}
*/
module.exports = function (str, locale, replacement) {
if (str == null) {
return ''
}
replacement = typeof replacement !== 'string' ? ' ' : replacement
function replace (match, index, value) {
if (index === 0 || index === (value.length - match.length)) {
return ''
}
return replacement
}
str = String(str)
// Support camel case ("camelCase" -> "camel Case").
.replace(CAMEL_CASE_REGEXP, '$1 $2')
// Support odd camel case ("CAMELCase" -> "CAMEL Case").
.replace(CAMEL_CASE_UPPER_REGEXP, '$1 $2')
// Remove all non-word characters and replace with a single space.
.replace(NON_WORD_REGEXP, replace)
// Lower case the entire string.
return lowerCase(str, locale)
}
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