//! Convert HTML to Markdown. mod html_element;pub mod markdown;mod markdown_writer;pub mod structure; use std::io::Read; use anyhow::{Context, Result};use html5ever::driver::ParseOpts;use html5ever::parse_document;use html5ever::tendril::TendrilSink;use html5ever::tree_builder::TreeBuilderOpts;use markup5ever_rcdom::RcDom; pub use crate::html_element::*;pub use crate::markdown_writer::*; /// Converts the provided HTML to Markdown.pub fn convert_html_to_markdown(html: impl Read, handlers: &mut [TagHandler]) -> Result<String> {    let dom = parse_html(html).context("failed to parse HTML")?;     let markdown_writer = MarkdownWriter::new();    let markdown = markdown_writer        .run(&dom.document, handlers)        .context("failed to convert HTML to Markdown")?;     Ok(markdown)} fn parse_html(mut html: impl Read) -> Result<RcDom> {    let parse_options = ParseOpts {        tree_builder: TreeBuilderOpts {            drop_doctype: true,            ..Default::default()        },        ..Default::default()    };    let dom = parse_document(RcDom::default(), parse_options)        .from_utf8()        .read_from(&mut html)        .context("failed to parse HTML document")?;     Ok(dom)}