tranz/src/runProcessor.ts

The framework for transform anything

/**
 * @file runProcessor
 * @author Cuttle Cong
 * @date 2018/9/28
 *
 */
import * as reduce from 'p-reduce'
import * as VError from 'verror'
import quote from 'quote-it'
import { ProcessFunction, ProcessFunctions, Processor } from './index'
import normalizeProcessor from './normalizeProcessor'

export default async function runProcessor(input, processor: Processor, options?: any) {
  processor = normalizeProcessor(processor, options)

  let processorArray = processor
  if (!Array.isArray(processor)) {
    processorArray = [processor as Function] as ProcessFunctions
  }

  let processorId = processor.id

  try {
    return await reduce(
      processorArray,
      (input, runner) => {
        if (typeof runner === 'function') {
          return runner.call(options, input)
        }
        return runProcessor(input, runner, options)
      },
      input
    )
  } catch (e) {
    throw new VError(
      { cause: e, name: 'TranzError' },
      `Error occurs when process` + (processorId ? ` using ${quote(String(processorId), '`')}` : '')
    )
  }
}