pudding/lib/pudding.js

Generate test data with random embed values.

/**
 * Pudding context.
 * @memberof module:puddling/lib
 * @constructor Pudding
 */

'use strict'

const puddingEvaluator = require('pudding-evaluator')
const puddingContext = require('pudding-context')
const puddingDatasource = require('pudding-datasource')

/** @lends Pudding */
function Pudding (config = {}) {
  const s = this
  Object.assign(s, config)
}

Pudding.prototype = {
  vars: {},
  lang: 'ja', // TODO

  /**
   * Add vars.
   * @param {object} vars - Variable.
   * @returns {Pudding} - Returns self.
   */
  addVars (vars) {
    const s = this
    s.vars = Object.assign({}, s.vars, vars)
    return s
  },

  /**
   * Set lang.
   * @param {string} lang - Lang to set.
   * @returns {Pudding} - Returns self.
   */
  setLang (lang) {
    const s = this
    s.lang = lang
    return s
  },

  /**
   * Explode data.
   * @param {object} seed - Expression object.
   * @param {number} count - Data count.
   * @param {object} [options] - Optional settings.
   * @param {object} [options.locals] - Local variables.
   * @returns {Array} - Exploded.
   */
  explode (seed, count, options) {
    options = options || []
    let locals = options.locals || {}
    const s = this
    let evaluator = s.newEvaluator()
    let datasource = s.newDatasource(count)
    let exploded = []
    for (let i = 0; i < count; i++) {
      let data = datasource[ i ]
      let context = s.newContext(i, locals, data)
      let evaluated = evaluator.eval(seed, context)
      exploded.push(evaluated)
    }
    return exploded
  },

  newDatasource (count) {
    const s = this
    let { lang } = s
    return puddingDatasource(lang, count)
  },

  newEvaluator () {
    return puddingEvaluator()
  },

  newContext (i, locals, data) {
    const s = this
    let vars = s.vars || {}
    return puddingContext({
      i: i,
      index: i,
      $index: i
    }, vars, locals, data)
  }
}

module.exports = Pudding