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use error::MarkdownErrorKind as MEK;
use error::ResultExt;
use error::Result;
use hoedown::renderer::Render;
use hoedown::Buffer;
use hoedown::Markdown;
use url::Url;
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct Link {
pub title: String,
pub link: String,
}
impl Link {
pub fn into_urllink(self) -> Result<UrlLink> {
Url::parse(&self.link[..])
.map(move |link| UrlLink { title: self.title, link: link, })
.chain_err(|| MEK::LinkParsingError)
}
}
pub struct UrlLink {
pub title: String,
pub link: Url,
}
#[derive(Debug)]
struct LinkExtractor {
links: Vec<Link>,
}
impl LinkExtractor {
pub fn new() -> LinkExtractor {
LinkExtractor { links: vec![] }
}
pub fn links(self) -> Vec<Link> {
self.links
}
}
impl Render for LinkExtractor {
fn link(&mut self,
_: &mut Buffer,
content: Option<&Buffer>,
link: Option<&Buffer>,
_: Option<&Buffer>)
-> bool
{
let link = link.and_then(|l| l.to_str().ok()).map(String::from);
let content = content.and_then(|l| l.to_str().ok()).map(String::from);
trace!("Processing...");
trace!("link = {:?}", link);
trace!("content = {:?}", content);
match (link, content) {
(Some(link), Some(content)) => {
self.links.push(Link { link: link, title: content });
false
},
(_, _) => {
false
},
}
}
}
pub fn extract_links(buf: &str) -> Vec<Link> {
let mut le = LinkExtractor::new();
le.render(&Markdown::new(buf));
trace!("Extracted: {:?}", le);
le.links()
}
#[cfg(test)]
mod test {
use super::{Link, extract_links};
#[test]
fn test_one_link() {
let testtext = "Some [example text](http://example.com).";
let exp = Link {
title: String::from("example text"),
link: String::from("http://example.com"),
};
let mut links = extract_links(testtext);
assert_eq!(1, links.len());
assert_eq!(exp, links.pop().unwrap())
}
#[test]
fn test_two_similar_links() {
let testtext = r#"
Some [example text](http://example.com).
Some more [example text](http://example.com).
"#;
let exp = Link {
title: String::from("example text"),
link: String::from("http://example.com"),
};
let mut links = extract_links(&testtext[..]);
assert_eq!(2, links.len());
assert_eq!(exp, links.pop().unwrap());
assert_eq!(exp, links.pop().unwrap());
}
#[test]
fn test_two_links() {
let testtext = r#"
Some [example text](http://example.com).
Some more [foo](http://example.com/foo).
"#;
let exp1 = Link {
title: String::from("example text"),
link: String::from("http://example.com"),
};
let exp2 = Link {
title: String::from("foo"),
link: String::from("http://example.com/foo"),
};
let mut links = extract_links(&testtext[..]);
assert_eq!(2, links.len());
assert_eq!(exp2, links.pop().unwrap());
assert_eq!(exp1, links.pop().unwrap());
}
}