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"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = _default;

var
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_utils = require("../utils");

var
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_exception = _interopRequireDefault(require("../exception"));

/*istanbul ignore next*/ function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }

function
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_default(instance) {
  instance.registerHelper('if', function (conditional, options) {
    if (arguments.length != 2) {
      throw new
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      _exception[
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      "default"]('#if requires exactly one argument');
    }

    if (
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    (0,
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    _utils.
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    isFunction)(conditional)) {
      conditional = conditional.call(this);
    } // Default behavior is to render the positive path if the value is truthy and not empty.
    // The `includeZero` option may be set to treat the condtional as purely not empty based on the
    // behavior of isEmpty. Effectively this determines if 0 is handled by the positive path or negative.


    if (!options.hash.includeZero && !conditional ||
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    (0,
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    _utils.
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    isEmpty)(conditional)) {
      return options.inverse(this);
    } else {
      return options.fn(this);
    }
  });
  instance.registerHelper('unless', function (conditional, options) {
    if (arguments.length != 2) {
      throw new
      /*istanbul ignore next*/
      _exception[
      /*istanbul ignore next*/
      "default"]('#unless requires exactly one argument');
    }

    return instance.helpers['if'].call(this, conditional, {
      fn: options.inverse,
      inverse: options.fn,
      hash: options.hash
    });
  });
}

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module.exports = exports.default;
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