@wordpress/block-library/build-module/table-of-contents/utils.mjs

Block library for the WordPress editor.

// packages/block-library/src/table-of-contents/utils.ts
import { createBlock } from "@wordpress/blocks";
import { escapeAttribute, escapeEditableHTML } from "@wordpress/escape-html";
function linearToNestedHeadingList(headingList) {
  const nestedHeadingList = [];
  headingList.forEach((heading, key) => {
    if (heading.content === "") {
      return;
    }
    if (heading.level === headingList[0].level) {
      if (headingList[key + 1]?.level > heading.level) {
        let endOfSlice = headingList.length;
        for (let i = key + 1; i < headingList.length; i++) {
          if (headingList[i].level === heading.level) {
            endOfSlice = i;
            break;
          }
        }
        nestedHeadingList.push({
          heading,
          children: linearToNestedHeadingList(
            headingList.slice(key + 1, endOfSlice)
          )
        });
      } else {
        nestedHeadingList.push({
          heading,
          children: null
        });
      }
    }
  });
  return nestedHeadingList;
}
function createListItemBlocks(nestedHeadingList, ordered) {
  return nestedHeadingList.map(
    ({ heading: { content, link }, children }) => createBlock(
      "core/list-item",
      {
        // Headings are plain text, and links can carry query args on
        // paginated posts, so both need escaping to become markup.
        content: link ? `<a href="${escapeAttribute(
          link
        )}">${escapeEditableHTML(content)}</a>` : escapeEditableHTML(content)
      },
      children?.length ? [
        createBlock(
          "core/list",
          { ordered },
          createListItemBlocks(children, ordered)
        )
      ] : []
    )
  );
}
export {
  createListItemBlocks,
  linearToNestedHeadingList
};
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