Abbreviate multiple strings to two characters

abbreviate.js

(function () {
var abbrs = []
var abbr = function (full) {
  full = full
  .replace(/^[^\w\d]+/, "")
  .replace(/\s+/g, "_")
  .replace(/[^\w\d]/g, "")
  // Some's class => Somes_class
  var abbr = full[0]
  var testMatch;
  // awo_awe1P_awe => 1 [7]
  var trial1 = /[a-z_]([A-Z0-9])/g
  // awp_pawoe_ea => p [4]
  var trial0 = /_([a-z])/g
  for (var trial = -1; trial !== full.length; trial++ ) {
    switch (trial) {
    case -1:
      testMatch = trial1.exec(full)
      break;
    case 0:
      testMatch = trial0.exec(full)
      break;
    default:
      testMatch = [false,full[trial]]
    }
    if (testMatch) {
      if (testMatch[0])
        trial-- // Reduce trials if global matcher
      if (abbrs.indexOf(abbr + testMatch[1]) === -1) {
        abbr += testMatch[1]
        break
      }
    }
  }
  abbrs.push(abbr)
  return abbr
}
if (typeof module === "object")
  module.exports = abbr
else
  this.abbr = abbr
})();