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use crate::{RawParser, Event, FrontMatter, MarkdownExt, Options, Result, Share};
use serde_yaml;
use std::cell::RefCell;
use std::iter::Peekable;
use std::rc::Rc;
#[must_use = "iterators are lazy and do nothing unless consumed"]
pub struct Parser<'e> {
parser: Peekable<RawParser<'e>>,
frontmatter: Share<RefCell<Option<FrontMatter>>>,
}
impl<'e> Parser<'e> {
pub fn new(text: &'e str) -> Result<Parser<'e>> {
let mut parser = RawParser::new_ext(text, Options::all()).peekable();
return if let Some(Event::Frontmatter(s)) = parser.peek() {
let fm: FrontMatter = serde_yaml::from_str(s)?;
parser.next();
Ok(Parser {
parser,
frontmatter: Rc::new(RefCell::new(Some(fm))).into(),
})
} else {
Ok(Parser {
parser,
frontmatter: Rc::new(RefCell::new(None)).into(),
})
};
}
}
impl<'e> Iterator for Parser<'e> {
type Item = Event<'e>;
fn next(&mut self) -> Option<Self::Item> {
self.parser.next()
}
}
impl<'e> MarkdownExt<Event<'e>> for Parser<'e> {
fn frontmatter(&mut self) -> &mut Share<RefCell<Option<FrontMatter>>> {
&mut self.frontmatter
}
}