cql-execution/lib/elm/nullological.js

An execution framework for the Clinical Quality Language (CQL)

// Generated by CoffeeScript 1.12.7
(function() {
  var Coalesce, Expression, IsNull, Null,
    extend = function(child, parent) { for (var key in parent) { if (hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; },
    hasProp = {}.hasOwnProperty;

  Expression = require('./expression').Expression;

  module.exports.Null = Null = (function(superClass) {
    extend(Null, superClass);

    function Null(json) {
      Null.__super__.constructor.apply(this, arguments);
    }

    Null.prototype.exec = function(ctx) {
      return null;
    };

    return Null;

  })(Expression);

  module.exports.IsNull = IsNull = (function(superClass) {
    extend(IsNull, superClass);

    function IsNull(json) {
      IsNull.__super__.constructor.apply(this, arguments);
    }

    IsNull.prototype.exec = function(ctx) {
      return this.execArgs(ctx) == null;
    };

    return IsNull;

  })(Expression);

  module.exports.Coalesce = Coalesce = (function(superClass) {
    extend(Coalesce, superClass);

    function Coalesce(json) {
      Coalesce.__super__.constructor.apply(this, arguments);
    }

    Coalesce.prototype.exec = function(ctx) {
      var arg, i, item, j, len, len1, ref, result;
      ref = this.args;
      for (i = 0, len = ref.length; i < len; i++) {
        arg = ref[i];
        result = arg.execute(ctx);
        if (this.args.length === 1 && Array.isArray(result)) {
          for (j = 0, len1 = result.length; j < len1; j++) {
            item = result[j];
            if (item != null) {
              return item;
            }
          }
        } else {
          if (result != null) {
            return result;
          }
        }
      }
      return null;
    };

    return Coalesce;

  })(Expression);

}).call(this);

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