avg-core-ts/src/plugins/flow.js

Develop Adventure Game (or ADV, Visual Novel, Galgame, etc.) on your own!

/**
 * @file        Flow control commands
 * @author      MicroMatrix <yangpan.1985@bytedance.com>
 * @copyright   2012-2020 bytedance
 * @link        git@code.byted.org:yangpan.1985/avg.git
 */

import core from 'core/core';

class Flow {
  constructor() {
    this.initialed = false;

    core.use('flow-init', this.init.bind(this));
  }
  async init() {
    if (!this.initialed) {
      core.use('script-exec', this.exec.bind(this));
      this.initialed = true;
    }
  }

  /**
  * Supply flow-control commands:
  *
  * `wait`: Prevents script execution for some time. ex.`[flow wait time=1000]`
  *
  * @method exec
  * @param  {object}   ctx  middleware context
  * @param  {Function} next execute next middleware
  */
  async exec(ctx, next) {
    const { command, flags, params } = ctx;

    if (command === 'flow') {
      if (flags.includes('wait') && !flags.includes('_skip_')) {
        await new Promise(resolve => {
          setTimeout(resolve, params.time || 0);
        });
      }
    } else {
      await next();
    }
  }
}

const flow = new Flow();

export default flow;