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Filename : no-case.js
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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)
}