alinex-async/lib/once.js

An extended version of the async library.

(function() {
  module.exports["throw"] = function(func, context) {
    var called;
    if (typeof func !== 'function') {
      throw new Error("Argument func is not a function!");
    }
    called = false;
    return function() {
      if (called) {
        throw new Error("This function should only be called once.");
      }
      called = true;
      return func.apply(context, arguments);
    };
  };

  module.exports.skip = function(func, context) {
    var called;
    if (typeof func !== 'function') {
      throw new Error("Argument func is not a function!");
    }
    called = false;
    return function() {
      var cb, err;
      cb = arguments[arguments.length - 1];
      if (called) {
        err = new Error("This function should only be called once.");
        if (typeof cb === 'function') {
          return cb(err);
        }
        return err;
      }
      called = true;
      return func.apply(context, arguments);
    };
  };

  module.exports.time = function(func, context) {
    var listeners, started;
    if (typeof func !== 'function') {
      throw new Error("Argument func is not a function!");
    }
    started = false;
    listeners = [];
    return function() {
      var args, cb, ref;
      args = [].slice.call(arguments);
      cb = (ref = args.pop()) != null ? ref : {};
      listeners.push(cb);
      if (started) {
        return;
      }
      started = true;
      args.push(function() {
        var i, len, results1, work;
        started = false;
        work = [].slice.call(listeners);
        listeners = [];
        results1 = [];
        for (i = 0, len = work.length; i < len; i++) {
          cb = work[i];
          results1.push(cb.apply(null, arguments));
        }
        return results1;
      });
      return func.apply(context, args);
    };
  };

  module.exports.wait = function(func, context) {
    var done, listeners, results, started;
    if (typeof func !== 'function') {
      throw new Error("Argument func is not a function!");
    }
    started = false;
    done = false;
    listeners = [];
    results = [];
    return function() {
      var args, cb, ref;
      args = [].slice.call(arguments);
      cb = (ref = args.pop()) != null ? ref : {};
      if (done) {
        return cb.apply(null, results);
      }
      listeners.push(cb);
      if (started) {
        return;
      }
      started = true;
      args.push(function() {
        var i, len;
        done = true;
        results = [].slice.call(arguments);
        for (i = 0, len = listeners.length; i < len; i++) {
          cb = listeners[i];
          cb.apply(null, results);
        }
        return listeners = null;
      });
      return func.apply(context, args);
    };
  };

}).call(this);

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