epam/miew

import { isUndefined } from 'lodash'

export default class SDFStream {
  constructor(data) {
    this._strings = data.split(/\r?\n|\r/)
    this._currentStart = 0
    this._currentStringIndx = 0
  }

  setStart(start) {
    if (start >= this._strings.length) {
      this._currentStart = this._strings.length - 1
      this._currentStringIndx = this._strings.length - 1
    } else {
      this._currentStart = start
      this._currentStringIndx = start
    }
  }

  getNextString() {
    return this._strings[++this._currentStringIndx]
  }

  getCurrentString() {
    return this._strings[this._currentStringIndx]
  }

  getStringFromStart(numb) {
    this._currentStringIndx = this._currentStart + numb
    return this._strings[this._currentStart + numb]
  }

  findNextDataItem() {
    let curStr = this.getNextString()
    let res = false
    while (!isUndefined(curStr) && curStr.trim() !== '$$$$') {
      if (curStr.match(/>\s+<(.*)>/)) {
        res = true
        break
      }
      curStr = this.getNextString()
    }

    return res
  }

  findNextCompoundStart() {
    let curStr = this.getCurrentString()
    while (!isUndefined(curStr) && curStr.trim() !== '$$$$') {
      curStr = this.getNextString()
    }
    this.setStart(++this._currentStringIndx)
    return this.probablyHaveDataToParse()
  }

  probablyHaveDataToParse() {
    return this._currentStringIndx < this._strings.length - 2
  }
}