transit-im/middleware/format_split_by_portions/formatSplitByPortions.js

express-like framework for AIM bots creation (ICQ as well)

// Generated by CoffeeScript 1.6.3
(function() {
  var forEachPortion;

  module.exports = function(limit) {
    if (limit == null) {
      limit = 2000;
    }
    return function(data, next) {
      return forEachPortion(data, limit, function(dataPart) {
        return next(dataPart);
      });
    };
  };

  forEachPortion = function(text, maxPortionLength, forPortion) {
    var CRLF, buffer, index, length, lengths, lines, sum, _i, _len;
    lines = text.split("\n");
    lengths = lines.map(function(l) {
      return l.length;
    });
    if (Math.max.apply(null, lengths) > maxPortionLength) {
      throw "Cannot split text - there are lines larger than specified limit";
    }
    buffer = [];
    sum = 0;
    CRLF = 1;
    for (index = _i = 0, _len = lengths.length; _i < _len; index = ++_i) {
      length = lengths[index];
      if (sum + length > maxPortionLength) {
        forPortion(buffer.join("\n"));
        buffer = [];
        sum = 0;
      }
      buffer.push(lines[index]);
      sum += length + CRLF;
    }
    if (buffer.length) {
      return forPortion(buffer.join("\n"));
    }
  };

}).call(this);