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use crate::{
cache::{Cache, CacheError},
response::Response,
};
use alloc::sync::Arc;
use core::{
error::Error,
fmt,
fmt::{Display, Formatter},
};
use muffy_document::html::{Document, parse_bytes};
use std::io;
/// An HTML parser.
pub struct HtmlParser {
cache: Box<dyn Cache<Result<Arc<Document>, HtmlParseError>>>,
}
impl HtmlParser {
/// Creates an HTML parser.
pub fn new(cache: impl Cache<Result<Arc<Document>, HtmlParseError>> + 'static) -> Self {
Self {
cache: Box::new(cache),
}
}
/// Parses an HTML document.
pub async fn parse(&self, response: &Arc<Response>) -> Result<Arc<Document>, HtmlParseError> {
let response = response.clone();
self.cache
.get_with(
response.url().to_string(),
Box::new(async move {
parse_bytes(response.body())
.map(Into::into)
.map_err(|error| HtmlParseError::Io(error.into()))
}),
)
.await?
}
}
#[derive(Clone, Debug)]
pub enum HtmlParseError {
Cache(CacheError),
Io(Arc<io::Error>),
}
impl Error for HtmlParseError {}
impl Display for HtmlParseError {
fn fmt(&self, formatter: &mut Formatter<'_>) -> fmt::Result {
match self {
Self::Cache(error) => write!(formatter, "{error}"),
Self::Io(error) => write!(formatter, "{error}"),
}
}
}
impl From<CacheError> for HtmlParseError {
fn from(error: CacheError) -> Self {
Self::Cache(error)
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::MemoryCache;
use http::StatusCode;
use indoc::indoc;
use muffy_document::html::Element;
use pretty_assertions::assert_eq;
use url::Url;
#[tokio::test]
async fn parse_response() {
let parser = HtmlParser::new(MemoryCache::new(0));
assert_eq!(
parser
.parse(&Arc::new(Response::new(
Url::parse("https://foo.com").unwrap(),
StatusCode::OK,
Default::default(),
r#"<a href="https://foo.com/bar"></a>"#.trim().as_bytes().to_vec(),
Default::default(),
)))
.await
.unwrap(),
Document::new(vec![Arc::new(
Element::new(
"html".into(),
vec![],
vec![
Arc::new(Element::new("head".into(), vec![], vec![]).into()),
Arc::new(
Element::new(
"body".into(),
vec![],
vec![Arc::new(
Element::new(
"a".into(),
vec![("href".into(), "https://foo.com/bar".into())],
vec![]
)
.into()
)]
)
.into()
)
]
)
.into()
)])
.into()
);
}
#[tokio::test]
async fn parse_base() {
let parser = HtmlParser::new(MemoryCache::new(0));
assert_eq!(
parser
.parse(&Arc::new(Response::new(
Url::parse("https://foo.com").unwrap(),
StatusCode::OK,
Default::default(),
indoc! {r#"
<html>
<head>
<base href="https://foo.com/foo/" />
</head>
</html>
"#}
.trim()
.as_bytes()
.to_vec(),
Default::default(),
)))
.await
.unwrap()
.base(),
Some("https://foo.com/foo/")
);
}
#[tokio::test]
async fn parse_base_without_href() {
let parser = HtmlParser::new(MemoryCache::new(0));
assert_eq!(
parser
.parse(&Arc::new(Response::new(
Url::parse("https://foo.com").unwrap(),
StatusCode::OK,
Default::default(),
indoc! {r#"
<html>
<head>
<base target="_blank" />
</head>
</html>
"#}
.trim()
.as_bytes()
.to_vec(),
Default::default(),
)))
.await
.unwrap()
.base(),
None
);
}
#[tokio::test]
async fn parse_multiple_base_elements() {
let parser = HtmlParser::new(MemoryCache::new(0));
assert_eq!(
parser
.parse(&Arc::new(Response::new(
Url::parse("https://foo.com").unwrap(),
StatusCode::OK,
Default::default(),
indoc! {r#"
<html>
<head>
<base href="https://foo.com/first/" />
<base href="https://foo.com/second/" />
</head>
</html>
"#}
.trim()
.as_bytes()
.to_vec(),
Default::default(),
)))
.await
.unwrap()
.base(),
Some("https://foo.com/first/")
);
}
#[tokio::test]
async fn parse_base_in_body() {
let parser = HtmlParser::new(MemoryCache::new(0));
assert_eq!(
parser
.parse(&Arc::new(Response::new(
Url::parse("https://foo.com").unwrap(),
StatusCode::OK,
Default::default(),
indoc! {r#"
<html>
<head></head>
<body>
<base href="https://foo.com/foo/" />
</body>
</html>
"#}
.trim()
.as_bytes()
.to_vec(),
Default::default(),
)))
.await
.unwrap()
.base(),
Some("https://foo.com/foo/")
);
}
}