mirall-cli / node_modules / bare-encoding / index.js

const UTF8Decoder = require('./lib/utf8-decoder')
const PassThroughDecoder = require('./lib/pass-through-decoder')
const errors = require('./lib/errors')

exports.TextEncoder = class TextEncoder {
  // https://encoding.spec.whatwg.org/#dom-textencoder-encoding
  get encoding() {
    return 'utf-8'
  }

  // https://encoding.spec.whatwg.org/#dom-textencoder-encode
  encode(input) {
    return Buffer.from(input)
  }

  // https://encoding.spec.whatwg.org/#dom-textencoder-encodeinto
  encodeInto(input, destination) {
    if (ArrayBuffer.isView(destination)) {
      destination = Buffer.from(
        destination.buffer,
        destination.byteOffset,
        destination.byteLength
      )
    } else {
      destination = Buffer.from(destination)
    }

    return {
      read: input.length,
      written: destination.write(input)
    }
  }
}

exports.TextDecoder = class TextDecoder {
  // https://encoding.spec.whatwg.org/#dom-textdecoder
  constructor(label = 'utf-8') {
    this.encoding = getEncoding(label)

    switch (this.encoding) {
      case 'utf-8':
        this.decoder = new UTF8Decoder()
        break
      default:
        this.decoder = new PassThroughDecoder(this.encoding)
        break
    }
  }

  // https://encoding.spec.whatwg.org/#dom-textdecoder-decode
  decode(input, options = {}) {
    const result = this.decoder.decode(input)

    if (options.stream) return result

    return result + this.decoder.flush()
  }
}

// https://encoding.spec.whatwg.org/#concept-encoding-get
function getEncoding(label) {
  switch (label.trim().toLowerCase()) {
    case 'unicode-1-1-utf-8':
    case 'unicode11utf8':
    case 'unicode11utf8':
    case 'unicode20utf8':
    case 'utf-8':
    case 'utf8':
    case 'x-unicode20utf8':
      return 'utf-8'
    default:
      throw errors.INVALID_LABEL(`The label '${label}' is not a valid encoding`)
  }
}