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/************************************************************************/
var __webpack_exports__ = {};
__webpack_require__.r(__webpack_exports__);
/* harmony export */ __webpack_require__.d(__webpack_exports__, {
/* harmony export */   parse: function() { return /* binding */ parse; }
/* harmony export */ });
/**
 * @type {string}
 */
let document;
/**
 * @type {number}
 */
let offset;
/**
 * @type {ParsedBlock[]}
 */
let output;
/**
 * @type {ParsedFrame[]}
 */
let stack;

/**
 * @typedef {Object|null} Attributes
 */

/**
 * @typedef {Object} ParsedBlock
 * @property {string|null}        blockName    Block name.
 * @property {Attributes}         attrs        Block attributes.
 * @property {ParsedBlock[]}      innerBlocks  Inner blocks.
 * @property {string}             innerHTML    Inner HTML.
 * @property {Array<string|null>} innerContent Inner content.
 */

/**
 * @typedef {Object} ParsedFrame
 * @property {ParsedBlock} block            Block.
 * @property {number}      tokenStart       Token start.
 * @property {number}      tokenLength      Token length.
 * @property {number}      prevOffset       Previous offset.
 * @property {number|null} leadingHtmlStart Leading HTML start.
 */

/**
 * @typedef {'no-more-tokens'|'void-block'|'block-opener'|'block-closer'} TokenType
 */

/**
 * @typedef {[TokenType, string, Attributes, number, number]} Token
 */

/**
 * Matches block comment delimiters
 *
 * While most of this pattern is straightforward the attribute parsing
 * incorporates a tricks to make sure we don't choke on specific input
 *
 *  - since JavaScript has no possessive quantifier or atomic grouping
 *    we are emulating it with a trick
 *
 *    we want a possessive quantifier or atomic group to prevent backtracking
 *    on the `}`s should we fail to match the remainder of the pattern
 *
 *    we can emulate this with a positive lookahead and back reference
 *    (a++)*c === ((?=(a+))\1)*c
 *
 *    let's examine an example:
 *      - /(a+)*c/.test('aaaaaaaaaaaaad') fails after over 49,000 steps
 *      - /(a++)*c/.test('aaaaaaaaaaaaad') fails after 85 steps
 *      - /(?>a+)*c/.test('aaaaaaaaaaaaad') fails after 126 steps
 *
 *    this is because the possessive `++` and the atomic group `(?>)`
 *    tell the engine that all those `a`s belong together as a single group
 *    and so it won't split it up when stepping backwards to try and match
 *
 *    if we use /((?=(a+))\1)*c/ then we get the same behavior as the atomic group
 *    or possessive and prevent the backtracking because the `a+` is matched but
 *    not captured. thus, we find the long string of `a`s and remember it, then
 *    reference it as a whole unit inside our pattern
 *
 *    @see http://instanceof.me/post/52245507631/regex-emulate-atomic-grouping-with-lookahead
 *    @see http://blog.stevenlevithan.com/archives/mimic-atomic-groups
 *    @see https://javascript.info/regexp-infinite-backtracking-problem
 *
 *    once browsers reliably support atomic grouping or possessive
 *    quantifiers natively we should remove this trick and simplify
 *
 * @type {RegExp}
 *
 * @since 3.8.0
 * @since 4.6.1 added optimization to prevent backtracking on attribute parsing
 */
const tokenizer = /)[^])*)\5|[^]*?)}\s+)?(\/)?-->/g;

/**
 * Constructs a block object.
 *
 * @param {string|null}   blockName
 * @param {Attributes}    attrs
 * @param {ParsedBlock[]} innerBlocks
 * @param {string}        innerHTML
 * @param {string[]}      innerContent
 * @return {ParsedBlock} The block object.
 */
function Block(blockName, attrs, innerBlocks, innerHTML, innerContent) {
  return {
    blockName,
    attrs,
    innerBlocks,
    innerHTML,
    innerContent
  };
}

/**
 * Constructs a freeform block object.
 *
 * @param {string} innerHTML
 * @return {ParsedBlock} The freeform block object.
 */
function Freeform(innerHTML) {
  return Block(null, {}, [], innerHTML, [innerHTML]);
}

/**
 * Constructs a frame object.
 *
 * @param {ParsedBlock} block
 * @param {number}      tokenStart
 * @param {number}      tokenLength
 * @param {number}      prevOffset
 * @param {number|null} leadingHtmlStart
 * @return {ParsedFrame} The frame object.
 */
function Frame(block, tokenStart, tokenLength, prevOffset, leadingHtmlStart) {
  return {
    block,
    tokenStart,
    tokenLength,
    prevOffset: prevOffset || tokenStart + tokenLength,
    leadingHtmlStart
  };
}

/**
 * Parser function, that converts input HTML into a block based structure.
 *
 * @param {string} doc The HTML document to parse.
 *
 * @example
 * Input post:
 * ```html
 * 
 * <div class="wp-block-columns has-3-columns">
 * <div class="wp-block-column">
 * <p>Left</p>
 * </div>
 * 
 *
 * 
 * <div class="wp-block-column">
 * <p><strong>Middle</strong></p>
 * </div>
 * 
 *
 * 
 * <div class="wp-block-column"></div>
 * </div>
 * 
 * ```
 *
 * Parsing code:
 * ```js
 * import { parse } from '@wordpress/block-serialization-default-parser';
 *
 * parse( post ) === [
 *     {
 *         blockName: "core/columns",
 *         attrs: {
 *             columns: 3
 *         },
 *         innerBlocks: [
 *             {
 *                 blockName: "core/column",
 *                 attrs: null,
 *                 innerBlocks: [
 *                     {
 *                         blockName: "core/paragraph",
 *                         attrs: null,
 *                         innerBlocks: [],
 *                         innerHTML: "\n<p>Left</p>\n"
 *                     }
 *                 ],
 *                 innerHTML: '\n<div class="wp-block-column"></div>\n'
 *             },
 *             {
 *                 blockName: "core/column",
 *                 attrs: null,
 *                 innerBlocks: [
 *                     {
 *                         blockName: "core/paragraph",
 *                         attrs: null,
 *                         innerBlocks: [],
 *                         innerHTML: "\n<p><strong>Middle</strong></p>\n"
 *                     }
 *                 ],
 *                 innerHTML: '\n<div class="wp-block-column"></div>\n'
 *             },
 *             {
 *                 blockName: "core/column",
 *                 attrs: null,
 *                 innerBlocks: [],
 *                 innerHTML: '\n<div class="wp-block-column"></div>\n'
 *             }
 *         ],
 *         innerHTML: '\n<div class="wp-block-columns has-3-columns">\n\n\n\n</div>\n'
 *     }
 * ];
 * ```
 * @return {ParsedBlock[]} A block-based representation of the input HTML.
 */
const parse = doc => {
  document = doc;
  offset = 0;
  output = [];
  stack = [];
  tokenizer.lastIndex = 0;
  do {
    // twiddle our thumbs
  } while (proceed());
  return output;
};

/**
 * Parses the next token in the input document.
 *
 * @return {boolean} Returns true when there is more tokens to parse.
 */
function proceed() {
  const stackDepth = stack.length;
  const next = nextToken();
  const [tokenType, blockName, attrs, startOffset, tokenLength] = next;

// We may have some HTML soup before the next block.
  const leadingHtmlStart = startOffset > offset ? offset : null;
  switch (tokenType) {
    case 'no-more-tokens':
      // If not in a block then flush output.
      if (0 === stackDepth) {
        addFreeform();
        return false;
      }

// Otherwise we have a problem
      // This is an error
      // we have options
      //  - treat it all as freeform text
      //  - assume an implicit closer (easiest when not nesting)

// For the easy case we'll assume an implicit closer.
      if (1 === stackDepth) {
        addBlockFromStack();
        return false;
      }

// For the nested case where it's more difficult we'll
      // have to assume that multiple closers are missing
      // and so we'll collapse the whole stack piecewise.
      while (0 < stack.length) {
        addBlockFromStack();
      }
      return false;
    case 'void-block':
      // easy case is if we stumbled upon a void block
      // in the top-level of the document.
      if (0 === stackDepth) {
        if (null !== leadingHtmlStart) {
          output.push(Freeform(document.substr(leadingHtmlStart, startOffset - leadingHtmlStart)));
        }
        output.push(Block(blockName, attrs, [], '', []));
        offset = startOffset + tokenLength;
        return true;
      }

// Otherwise we found an inner block.
      addInnerBlock(Block(blockName, attrs, [], '', []), startOffset, tokenLength);
      offset = startOffset + tokenLength;
      return true;
    case 'block-opener':
      // Track all newly-opened blocks on the stack.
      stack.push(Frame(Block(blockName, attrs, [], '', []), startOffset, tokenLength, startOffset + tokenLength, leadingHtmlStart));
      offset = startOffset + tokenLength;
      return true;
    case 'block-closer':
      // If we're missing an opener we're in trouble
      // This is an error.
      if (0 === stackDepth) {
        // We have options
        //  - assume an implicit opener
        //  - assume _this_ is the opener
        // - give up and close out the document.
        addFreeform();
        return false;
      }

// If we're not nesting then this is easy - close the block.
      if (1 === stackDepth) {
        addBlockFromStack(startOffset);
        offset = startOffset + tokenLength;
        return true;
      }

// Otherwise we're nested and we have to close out the current
      // block and add it as a innerBlock to the parent.
      const stackTop = /** @type {ParsedFrame} */stack.pop();
      const html = document.substr(stackTop.prevOffset, startOffset - stackTop.prevOffset);
      stackTop.block.innerHTML += html;
      stackTop.block.innerContent.push(html);
      stackTop.prevOffset = startOffset + tokenLength;
      addInnerBlock(stackTop.block, stackTop.tokenStart, stackTop.tokenLength, startOffset + tokenLength);
      offset = startOffset + tokenLength;
      return true;
    default:
      // This is an error.
      addFreeform();
      return false;
  }
}

/**
 * Parse JSON if valid, otherwise return null
 *
 * Note that JSON coming from the block comment
 * delimiters is constrained to be an object
 * and cannot be things like `true` or `null`
 *
 * @param {string} input JSON input string to parse
 * @return {Object|null} parsed JSON if valid
 */
function parseJSON(input) {
  try {
    return JSON.parse(input);
  } catch (e) {
    return null;
  }
}

/**
 * Finds the next token in the document.
 *
 * @return {Token} The next matched token.
 */
function nextToken() {
  // Aye the magic
  // we're using a single RegExp to tokenize the block comment delimiters
  // we're also using a trick here because the only difference between a
  // block opener and a block closer is the leading `/` before `wp:` (and
  // a closer has no attributes). we can trap them both and process the
  // match back in JavaScript to see which one it was.
  const matches = tokenizer.exec(document);

// We have no more tokens.
  if (null === matches) {
    return ['no-more-tokens', '', null, 0, 0];
  }
  const startedAt = matches.index;
  const [match, closerMatch, namespaceMatch, nameMatch, attrsMatch /* Internal/unused. */,, voidMatch] = matches;
  const length = match.length;
  const isCloser = !!closerMatch;
  const isVoid = !!voidMatch;
  const namespace = namespaceMatch || 'core/';
  const name = namespace + nameMatch;
  const hasAttrs = !!attrsMatch;
  const attrs = hasAttrs ? parseJSON(attrsMatch) : {};

// This state isn't allowed
  // This is an error.
  if (isCloser && (isVoid || hasAttrs)) {
    // We can ignore them since they don't hurt anything
    // we may warn against this at some point or reject it.
  }
  if (isVoid) {
    return ['void-block', name, attrs, startedAt, length];
  }
  if (isCloser) {
    return ['block-closer', name, null, startedAt, length];
  }
  return ['block-opener', name, attrs, startedAt, length];
}

/**
 * Adds a freeform block to the output.
 *
 * @param {number} [rawLength]
 */
function addFreeform(rawLength) {
  const length = rawLength ? rawLength : document.length - offset;
  if (0 === length) {
    return;
  }
  output.push(Freeform(document.substr(offset, length)));
}

/**
 * Adds inner block to the parent block.
 *
 * @param {ParsedBlock} block
 * @param {number}      tokenStart
 * @param {number}      tokenLength
 * @param {number}      [lastOffset]
 */
function addInnerBlock(block, tokenStart, tokenLength, lastOffset) {
  const parent = stack[stack.length - 1];
  parent.block.innerBlocks.push(block);
  const html = document.substr(parent.prevOffset, tokenStart - parent.prevOffset);
  if (html) {
    parent.block.innerHTML += html;
    parent.block.innerContent.push(html);
  }
  parent.block.innerContent.push(null);
  parent.prevOffset = lastOffset ? lastOffset : tokenStart + tokenLength;
}

/**
 * Adds block from the stack to the output.
 *
 * @param {number} [endOffset]
 */
function addBlockFromStack(endOffset) {
  const {
    block,
    leadingHtmlStart,
    prevOffset,
    tokenStart
  } = /** @type {ParsedFrame} */stack.pop();
  const html = endOffset ? document.substr(prevOffset, endOffset - prevOffset) : document.substr(prevOffset);
  if (html) {
    block.innerHTML += html;
    block.innerContent.push(html);
  }
  if (null !== leadingHtmlStart) {
    output.push(Freeform(document.substr(leadingHtmlStart, tokenStart - leadingHtmlStart)));
  }
  output.push(block);
}

(window.wp = window.wp || {}).blockSerializationDefaultParser = __webpack_exports__;
/******/ })()
;

Editing: block-serialization-default-parser.js

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