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rewrite to actually use pulldown idiomatically

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This commit is contained in:
Tomáš Mládek 2021-10-04 21:23:04 +02:00
parent bca533c701
commit f5d6c9c05b
1 changed files with 31 additions and 49 deletions
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80
src/main.rs
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@ -407,7 +407,7 @@ fn update_garden<P: AsRef<Path>>(
let mut file_string = String::new();
file.read_to_string(&mut file_string)?;
let markdown_source = preprocess_markdown(file_string);
let result = GardenParser::parse(&markdown_source)?;
let result = parse_garden(&markdown_source)?;
pages.insert(
String::from(path.to_str().unwrap()),
@ -435,66 +435,48 @@ fn update_garden<P: AsRef<Path>>(
Ok(result)
}
struct GardenParser<'a> {
parser: Parser<'a>,
last_nontext_event: Option<Event<'a>>,
current_top_heading: u32,
top_heading_text: &'a mut Option<String>,
links: &'a mut Vec<String>,
}
struct ParseResult {
html: String,
title: Option<String>,
links: Vec<String>,
}
impl<'a> GardenParser<'a> {
fn parse<S: AsRef<str>>(text: &'a S) -> anyhow::Result<ParseResult> {
let mut title: Option<String> = None;
let mut links: Vec<String> = vec![];
fn parse_garden<S: AsRef<str>>(text: S) -> anyhow::Result<ParseResult> {
let mut current_top_heading = 999;
let mut top_heading_text: Option<String> = None;
let parser = GardenParser {
parser: Parser::new_ext(text.as_ref(), Options::all()),
last_nontext_event: None,
current_top_heading: 999,
top_heading_text: &mut title,
links: &mut links,
};
let mut last_nontext_event: Option<Event> = None;
let mut html = String::new();
html::push_html(&mut html, parser);
html = postprocess_html(html)?;
let mut links: Vec<String> = vec![];
Ok(ParseResult { html, title, links })
}
}
impl<'a> Iterator for GardenParser<'a> {
type Item = Event<'a>;
fn next(&mut self) -> Option<Self::Item> {
let event = self.parser.next();
if let Some(event) = &event {
if let Event::Start(Tag::Link(_, str, _)) = &event {
self.links.push(str.to_string());
}
if let Some(Event::Start(Tag::Heading(hl))) = self.last_nontext_event {
if hl < self.current_top_heading {
self.current_top_heading = hl;
if let Event::Text(str) = &event {
*self.top_heading_text = Some(str.clone().into_string());
}
}
}
self.last_nontext_event = Some(event.clone());
let parser = Parser::new_ext(text.as_ref(), Options::all()).map(|event| {
if let Event::Start(Tag::Link(_, str, _)) = &event {
links.push(str.to_string());
}
if let Some(Event::Start(Tag::Heading(hl))) = last_nontext_event {
if hl < current_top_heading {
current_top_heading = hl;
if let Event::Text(str) = &event {
top_heading_text = Some(str.clone().into_string());
}
}
}
last_nontext_event = Some(event.clone());
event
}
});
let mut html = String::new();
html::push_html(&mut html, parser);
html = postprocess_html(html)?;
Ok(ParseResult {
html,
title: top_heading_text,
links,
})
}
fn preprocess_markdown(string: String) -> String {