epam/miew

/**
 * Parser helper for PDB tag "REMARK 290".
 *
 * @exports Remark290
 * @constructor
 */
import { Matrix4 } from 'three'

class Remark290 {
  constructor() {
    /** @type {Matrix4[]} */
    this.matrices = []

    /** @type {?Matrix4} */
    this._matrix = null
    /** @type {number} */
    this._matrixIndex = -1
  }

  /**
   * Parse a single line of a stream.
   * @param {PDBStream} stream - stream to parse
   */

  parse(stream) {
    /** @type {?Matrix4} */
    let matrix = this._matrix

    if (stream.readString(12, 18) === '  SMTRY') {
      const matrixRow = stream.readCharCode(19) - 49 // convert '1', '2', or '3' -> 0, 1, or 2
      const matrixData = stream.readString(20, 80).trim().split(/\s+/)
      const matrixIndex = parseInt(matrixData[0], 10)
      if (this._matrix === null || matrixIndex !== this._matrixIndex) {
        // TODO: assert(matrixIndex === this.matrices.length + 1);
        this._matrixIndex = matrixIndex
        this._matrix = matrix = new Matrix4()
        this.matrices[this.matrices.length] = matrix
      }

      const { elements } = matrix
      elements[matrixRow] = parseFloat(matrixData[1])
      elements[matrixRow + 4] = parseFloat(matrixData[2])
      elements[matrixRow + 8] = parseFloat(matrixData[3])
      elements[matrixRow + 12] = parseFloat(matrixData[4])
    }
  }
}

Remark290.prototype.id = 290

export default Remark290