s2s-handler-pegjs

index.js

//@flow

import peg from 'pegjs'

import type { Code } from 'types'

export default function pegjsHandler(code: Code): Code {
  if (code === '') {
    return ''
  }

  return peg.generate(code, { output: 'source', format: 'commonjs' })
}

index.test.js

//@flow
import fs from 'fs'
import os from 'os'
import path from 'path'

import handler from '.'

const code = 'start = [a-z]+ {return text()}'

test('hndlerは返還後のコードを返す', () => {
  const result = handler(code)
  const dir = fs.mkdtempSync(`${os.tmpdir()}${path.sep}`)
  const filename = `${dir}/index.js`
  fs.writeFileSync(filename, result)

  // FIXME: Flowの警告が消せない…
  // eslint-disable-next-line global-require, import/no-dynamic-require
  const parser = require(dir)
  expect(parser.parse('hoge')).toBe('hoge')
})

test('codeが""の場合、""が返ること', () => {
  const result = handler('')
  expect(result).toBe('')
})