sms_counter.js

(function() {
  var $, SmsCounter;

  window.SmsCounter = SmsCounter = (function() {
    function SmsCounter() {}

    SmsCounter.gsm7bitChars = "@£$¥èéùìòÇ\\nØø\\rÅåΔ_ΦΓΛΩΠΨΣΘΞÆæßÉ !\\\"#¤%&'()*+,-./0123456789:;<=>?¡ABCDEFGHIJKLMNOPQRSTUVWXYZÄÖÑܧ¿abcdefghijklmnopqrstuvwxyzäöñüà";

    SmsCounter.gsm7bitExChar = "\\^{}\\\\\\[~\\]|€";

    SmsCounter.gsm7bitRegExp = RegExp("^[" + SmsCounter.gsm7bitChars + "]*$");

    SmsCounter.gsm7bitExRegExp = RegExp("^[" + SmsCounter.gsm7bitChars + SmsCounter.gsm7bitExChar + "]*$");

    SmsCounter.gsm7bitExOnlyRegExp = RegExp("^[\\" + SmsCounter.gsm7bitExChar + "]*$");

    SmsCounter.GSM_7BIT = 'GSM_7BIT';

    SmsCounter.GSM_7BIT_EX = 'GSM_7BIT_EX';

    SmsCounter.UTF16 = 'UTF16';

    SmsCounter.messageLength = {
      GSM_7BIT: 160,
      GSM_7BIT_EX: 160,
      UTF16: 70
    };

    SmsCounter.multiMessageLength = {
      GSM_7BIT: 153,
      GSM_7BIT_EX: 153,
      UTF16: 67
    };

    SmsCounter.count = function(text) {
      var count, encoding, length, messages, per_message, remaining;
      encoding = this.detectEncoding(text);
      length = text.length;
      if (encoding === this.GSM_7BIT_EX) {
        length += this.countGsm7bitEx(text);
      }
      per_message = this.messageLength[encoding];
      if (length > per_message) {
        per_message = this.multiMessageLength[encoding];
      }
      messages = Math.ceil(length / per_message);
      remaining = (per_message * messages) - length;
      if(remaining == 0 && messages == 0){
        remaining = per_message;
      }
      return count = {
        encoding: encoding,
        length: length,
        per_message: per_message,
        remaining: remaining,
        messages: messages
      };
    };

    SmsCounter.detectEncoding = function(text) {
      switch (false) {
        case text.match(this.gsm7bitRegExp) == null:
          return this.GSM_7BIT;
        case text.match(this.gsm7bitExRegExp) == null:
          return this.GSM_7BIT_EX;
        default:
          return this.UTF16;
      }
    };

    SmsCounter.countGsm7bitEx = function(text) {
      var char2, chars;
      chars = (function() {
        var _i, _len, _results;
        _results = [];
        for (_i = 0, _len = text.length; _i < _len; _i++) {
          char2 = text[_i];
          if (char2.match(this.gsm7bitExOnlyRegExp) != null) {
            _results.push(char2);
          }
        }
        return _results;
      }).call(this);
      return chars.length;
    };

    return SmsCounter;

  })();

  if (typeof jQuery !== "undefined" && jQuery !== null) {
    $ = jQuery;
    $.fn.countSms = function(target) {
      var count_sms, input;
      input = this;
      target = $(target);
      count_sms = function() {
        var count, k, v, _results;
        count = SmsCounter.count(input.val());
        _results = [];
        for (k in count) {
          v = count[k];
          _results.push(target.find("." + k).text(v));
        }
        return _results;
      };
      this.on('keyup', count_sms);
      return count_sms();
    };
  }

}).call(this);