Method [kMoveCursor]

lib/internal/readline/interface.js:1231–1254

(dx)

  // This function moves cursor dx places to the right
  // (-dx for left) and refreshes the line if it is needed.
  [kMoveCursor](dx) {
    if (dx === 0) {
      return;
    }
    const oldPos = this.getCursorPos();
    this.cursor += dx;

    // Bounds check
    if (this.cursor < 0) {
      this.cursor = 0;
    } else if (this.cursor > this.line.length) {
      this.cursor = this.line.length;
    }

    const newPos = this.getCursorPos();

    // Check if cursor stayed on the line.
    if (oldPos.rows === newPos.rows) {
      const diffWidth = newPos.cols - oldPos.cols;
      moveCursor(this.output, diffWidth, 0);
    } else {
      this[kRefreshLine]();
    }
  }

  // Handle a write from the tty
  [kTtyWrite](s, key) {