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anchor.rs
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anchor.rs
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use std::{cell::RefCell, rc::Rc};
use html5ever::Attribute;
use markup5ever_rcdom::Node;
use crate::{
options::{LinkReferenceStyle, LinkStyle, Options},
text_util::{concat_strings, JoinOnStringIterator, StripWhitespace, TrimAsciiWhitespace},
};
use super::ElementHandler;
pub(super) struct AnchorElementHandler {}
impl AnchorElementHandler {
thread_local! {
static LINKS: RefCell<Vec<String>> = const { RefCell::new(vec![]) };
}
}
impl ElementHandler for AnchorElementHandler {
fn append(&self) -> Option<String> {
AnchorElementHandler::LINKS.with(|links| {
let mut links = links.borrow_mut();
if links.is_empty() {
return None;
}
let result = concat_strings!("\n\n", links.join("\n"), "\n\n");
links.clear();
Some(result)
})
}
fn on_visit(
&self,
_node: &Rc<Node>,
_tag: &str,
attrs: &[Attribute],
content: &str,
options: &Options,
) -> Option<String> {
let mut link: Option<String> = None;
let mut title: Option<String> = None;
for attr in attrs.iter() {
let name = &attr.name.local;
if name == "href" {
link = Some(attr.value.to_string())
} else if name == "title" {
title = Some(attr.value.to_string());
}
}
let Some(link) = link else {
return Some(content.to_string());
};
let process_title = |text: String| {
text.lines()
.map(|line| line.trim_ascii_whitespace().replace('"', "\\\""))
.filter(|line| !line.is_empty())
.join("\n")
};
// Handle new lines in title
let title = title.map(process_title);
let link = link.replace('(', "\\(").replace(')', "\\)");
let md = if options.link_style == LinkStyle::Inlined {
self.build_inlined_anchor(content, link, title)
} else {
self.build_referenced_anchor(content, link, title, &options.link_reference_style)
};
Some(md)
}
}
impl AnchorElementHandler {
pub(super) fn new() -> Self {
Self {}
}
fn build_inlined_anchor(&self, content: &str, link: String, title: Option<String>) -> String {
let has_spaces_in_link = link.contains(' ');
let (content, leading_whitespace) = content.strip_leading_whitespace();
let (content, trailing_whitespace) = content.strip_trailing_whitespace();
concat_strings!(
leading_whitespace.unwrap_or(""),
"[",
content,
"](",
if has_spaces_in_link { "<" } else { "" },
link,
title
.as_ref()
.map_or(String::new(), |t| concat_strings!(" \"", t, "\"")),
if has_spaces_in_link { ">" } else { "" },
")",
trailing_whitespace.unwrap_or("")
)
}
fn build_referenced_anchor(
&self,
content: &str,
link: String,
title: Option<String>,
style: &LinkReferenceStyle,
) -> String {
AnchorElementHandler::LINKS.with(|links| {
let title = title.map_or(String::new(), |t| concat_strings!(" \"", t, "\""));
let (current, append) = match style {
LinkReferenceStyle::Full => {
let index = links.borrow().len() + 1;
(
concat_strings!("[", content, "][", index.to_string(), "]"),
concat_strings!("[", index.to_string(), "]: ", link, title),
)
}
LinkReferenceStyle::Collapsed => (
concat_strings!("[", content, "][]"),
concat_strings!("[", content, "]: ", link, title),
),
LinkReferenceStyle::Shortcut => (
concat_strings!("[", content, "]"),
concat_strings!("[", content, "]: ", link, title),
),
};
links.borrow_mut().push(append);
current
})
}
}