zer/lib/factories.js

Generate Gremlin queries by chaining JavaScript function calls

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.createChainCreator = createChainCreator;

var _lodash = require('lodash');

var _lodash2 = _interopRequireDefault(_lodash);

var _chain = require('./chain');

var _chainBuilder = require('./chain-builder');

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

/**
 * Given a rendering function and a syntax, returns a Proxy which can intercept
 * any property and creates a Chain that starts with that property 'name'.
 */
function createChainCreator(render, syntax) {
  // This Proxy initiates the chain, and must return a new Chain
  const handler = {
    get(createProxiedChainTarget, name) {
      return createProxiedChainTarget(name, render, syntax, {});
    }
  };

  return new Proxy(createProxiedChain, handler);
}
;

/**
 * Given a 'name', the Proxy intercepts and return a new ChainBuilder.
 * 'createChainBuilder' is a function that returns a Proxy<Function>.
 */
function createProxiedChain(chainName, render, syntax) {

  return new Proxy(_chainBuilder.createChainBuilder, {
    get(target, name) {
      const chain = (0, _chain.createChain)().startWith(chainName);

      const builder = target(chain, render, syntax)[name];

      return builder;
    },

    apply(target, thisArg, args) {
      const chain = (0, _chain.createChain)().startWith(chainName);
      const builder = target(chain, render, syntax)(...args);

      return builder;
    }
  });
}