htmlentity.coffee

decodeHtmlEntity = (str) ->
  str.replace /&#(\d+);/g, (match, dec) ->
    String.fromCharCode(dec)

encodeHtmlEntity = (str) ->
  buf = []
  for (var i=str.length-1;i>=0;i--) {
    buf.unshift(['&#', str[i].charCodeAt(), ';'].join(''))
  buf.join('')

encodeHtmlEntity2 = (string) ->
  if string and typeof(string) is 'string'
    document.createElement('div').appendChild(document.createTextNode(string)).parentNode.innerHTML
  else
    string

encodeHtmlEntity3 = (string) ->
  if string and typeof(string) is 'string'
    String(string).replace(/&amp;/g, '&').replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;') if string
  else
    string