prisme-flow/nodes/bridge/bot/bot-listen.js

prisme platform flow engine

/**
 * Created by prisme.io on 09/06/2017.
 */

var _ = require('underscore')
var NplMatcher = require('./lib/npl-matcher')
var clc = require('cli-color')
var prettyjson = require('prettyjson')

var green = clc.greenBright
var white = clc.white
var grey = clc.blackBright

module.exports = function (RED) {
  function BotListen (config) {
    RED.nodes.createNode(this, config)
    var node = this

    this.rules = config.rules
    this.showdebug = config.showdebug

    this.on('input', function (msg) {
      var originalMessage = msg.originalMessage
      var chatContext = msg.chat()

      var rules = node.rules
      var debug = node.showdebug

      // do nothing if it's not a chat message
      if (originalMessage == null || _.isEmpty(rules)) {
        return
      }

      var output = []
      var matched = false

      // parse incoming message
      var message = msg.payload.content
      var terms = NplMatcher.parseSentence(message)

      // debug the terms
      if (debug) {
        // eslint-disable-next-line no-console
        console.log('')
        // eslint-disable-next-line no-console
        console.log(grey('------ Sentence Analysis ----------------'))
        // eslint-disable-next-line no-console
        console.log(green('Message:'), white(message))
        try {
          // eslint-disable-next-line no-console
          console.log(prettyjson.render(terms._terms))
        } catch (e) {
          // pretty json may breaks
        }
      }

      rules.forEach(function (rule) {
        var matchedRule = null
        if (!matched && rule === '*') {
          // mark as matched, only the first wins
          matched = true
          output.push(msg)
        } else if (!matched && (matchedRule = NplMatcher.matchRule(terms, new NplMatcher.MatchRules(rule.split(',')))) != null) {
          // mark as matched, only the first wins
          matched = true
          // store variables
          matchedRule.forEach(function (rule) {
            if (!_.isEmpty(rule.variable)) {
              chatContext.set(rule.variable, rule.value)
            }
          })

          output.push(msg)
        } else {
          output.push(null)
        }
      })
      node.send(output)
    })
  }

  RED.nodes.registerType('bot-listen', BotListen)
}