use once_cell::sync::Lazy;
use regex::Regex;
use crate::{MarkdownIt, Node, NodeValue, Renderer};
use crate::parser::inline::{InlineRule, InlineState, Text};
#[derive(Debug)]
pub struct Autolink {
pub url: String,
}
impl NodeValue for Autolink {
fn render(&self, node: &Node, fmt: &mut dyn Renderer) {
let mut attrs = node.attrs.clone();
attrs.push(("href", self.url.clone()));
fmt.open("a", &attrs);
fmt.contents(&node.children);
fmt.close("a");
}
}
pub fn add(md: &mut MarkdownIt) {
md.inline.add_rule::<AutolinkScanner>();
}
static AUTOLINK_RE : Lazy<Regex> = Lazy::new(|| {
Regex::new(r"^([a-zA-Z][a-zA-Z0-9+.\-]{1,31}):([^<>\x00-\x20]*)$").unwrap()
});
static EMAIL_RE : Lazy<Regex> = Lazy::new(|| {
Regex::new(r"^([a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*)$").unwrap()
});
#[doc(hidden)]
pub struct AutolinkScanner;
impl InlineRule for AutolinkScanner {
const MARKER: char = '<';
fn run(state: &mut InlineState) -> Option<(Node, usize)> {
let mut chars = state.src[state.pos..state.pos_max].chars();
if chars.next().unwrap() != '<' { return None; }
let mut pos = state.pos + 2;
loop {
match chars.next() {
Some('<') | None => return None,
Some('>') => break,
Some(x) => pos += x.len_utf8(),
}
}
let url = &state.src[state.pos+1..pos-1];
let is_autolink = AUTOLINK_RE.is_match(url);
let is_email = EMAIL_RE.is_match(url);
if !is_autolink && !is_email { return None; }
let full_url = if is_autolink {
state.md.link_formatter.normalize_link(url)
} else {
state.md.link_formatter.normalize_link(&("mailto:".to_owned() + url))
};
state.md.link_formatter.validate_link(&full_url)?;
let content = state.md.link_formatter.normalize_link_text(url);
let mut inner_node = Node::new(Text { content });
inner_node.srcmap = state.get_map(state.pos + 1, pos - 1);
let mut node = Node::new(Autolink { url: full_url });
node.children.push(inner_node);
Some((node, pos - state.pos))
}
}