electrum-client-browser/src/socket/util.js

Electrum protocol client for node.js and browser

function createRecursiveParser(max_depth, delimiter) {
  const MAX_DEPTH = max_depth
  const DELIMITER = delimiter

  const recursiveParser = (n, buffer, callback) => {
    if (buffer.length === 0) {
      return {code: 0, buffer: buffer}
    }
    if (n > MAX_DEPTH) {
      return {code: 1, buffer: buffer}
    }
    const xs = buffer.split(DELIMITER)
    if (xs.length === 1) {
      return {code: 0, buffer: buffer}
    }
    callback(xs.shift(), n)
    return recursiveParser(n + 1, xs.join(DELIMITER), callback)
  }
  return recursiveParser
};


class MessageParser {
  constructor(callback) {
    this.buffer = ''
    this.callback = callback
    this.recursiveParser = createRecursiveParser(20, '\n')
  }

  run(chunk) {
    this.buffer += chunk
    while (true) {
      const res = this.recursiveParser(0, this.buffer, this.callback)
      this.buffer = res.buffer
      if (res.code === 0) {
        break
      }
    }
  }
}

exports.MessageParser = MessageParser