import {
  createTextBlockEnterRule,
  type EnterRule,
} from 'prosemirror-enter-rules'

export const MATH_BLOCK_ENTER_REGEXP: RegExp = /^\$\$$/

/**
 * An {@link EnterRule} that converts a textblock node that only contains `$$` into a math
 * block node when Enter is pressed.
 *
 * @public
 */
export const mathBlockEnterRule: EnterRule =
  /* @__PURE__ */ createTextBlockEnterRule({
    regex: MATH_BLOCK_ENTER_REGEXP,
    type: 'mathBlock',
  })