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import type { SerializedHTMLElement } from "../scrape/types";
import { htmlElementToMarkdownElements, mergeAdjacentElements } from "./fromHtml";
import type { HeaderElement, MarkdownElement } from "./types";
import { MarkdownElementType } from "./types";
import { chunkElements } from "./utils/chunk";
/**
* Converts HTML elements to Markdown elements and creates a tree based on header tags
* For example: h1 [h2 [p p blockquote] h2 [h3 [...] ] ]
**/
export function htmlToMarkdownTree(
title: string,
htmlElements: SerializedHTMLElement[],
maxCharsPerElem: number
): HeaderElement {
let parent: HeaderElement = {
type: MarkdownElementType.Header,
level: 1,
parent: null,
content: title,
children: [],
};
const markdownElements = chunkElements(
mergeAdjacentElements(
htmlElements.flatMap((elem) => htmlElementToMarkdownElements(parent, elem))
),
maxCharsPerElem
);
for (const elem of markdownElements) {
if (elem.type !== MarkdownElementType.Header) {
elem.parent = parent;
parent.children.push(elem);
continue;
}
// add 1 to current level to offset for the title being level 1
elem.level += 1;
// Pop up header levels until reaching the same level as the current header
// or until we reach the root
inner: while (parent !== null && parent.parent !== null) {
if (parent.level < elem.level) break inner;
parent = parent.parent;
}
parent.children.push(elem);
parent = elem;
}
// Pop up to the root
while (parent.parent !== null) {
parent = parent.parent;
}
return parent;
}
export function removeParents<T extends MarkdownElement>(elem: T): T {
if ("children" in elem) {
return { ...elem, parent: null, children: elem.children.map((child) => removeParents(child)) };
}
return { ...elem, parent: null };
}
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