2022-11-12 12:45:17 -05:00
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mod block;
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2022-11-16 16:11:55 -05:00
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mod inline;
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2022-11-20 13:13:48 -05:00
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mod lex;
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2022-11-12 12:45:17 -05:00
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mod span;
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mod tree;
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2022-11-20 13:13:48 -05:00
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pub struct Block;
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2022-11-12 12:45:17 -05:00
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const EOF: char = '\0';
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use span::Span;
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2022-11-20 13:13:48 -05:00
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pub struct Parser<'s> {
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src: &'s str,
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tree: block::Tree,
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}
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impl<'s> Parser<'s> {
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2022-11-22 13:19:21 -05:00
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#[must_use]
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2022-11-20 13:13:48 -05:00
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pub fn new(src: &'s str) -> Self {
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Self {
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src,
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tree: block::parse(src),
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}
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}
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2022-11-22 13:19:21 -05:00
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#[must_use]
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2022-11-20 13:13:48 -05:00
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pub fn iter(&self) -> Iter {
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Iter {
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src: self.src,
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2022-11-22 13:19:21 -05:00
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tree: self.tree.iter(),
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parser: None,
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2022-11-20 13:13:48 -05:00
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}
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}
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}
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2022-11-22 13:19:21 -05:00
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#[derive(Debug, PartialEq, Eq)]
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pub enum Event {
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Start(block::Block),
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End,
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Inline(inline::Event),
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Blankline,
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}
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2022-11-20 13:13:48 -05:00
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pub struct Iter<'s> {
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src: &'s str,
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2022-11-22 13:19:21 -05:00
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tree: block::TreeIter<'s>,
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parser: Option<inline::Parser<'s>>,
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2022-11-20 13:13:48 -05:00
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}
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impl<'s> Iterator for Iter<'s> {
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2022-11-22 13:19:21 -05:00
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type Item = Event;
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2022-11-20 13:13:48 -05:00
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fn next(&mut self) -> Option<Self::Item> {
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2022-11-22 13:19:21 -05:00
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while let Some(parser) = &mut self.parser {
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// inside leaf block, with inline content
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if let Some(inline) = parser.next() {
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return Some(Event::Inline(inline));
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} else if let Some(ev) = self.tree.next() {
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match ev {
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tree::Event::Element(atom, sp) => {
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assert_eq!(*atom, block::Atom::Inline);
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parser.parse(sp.of(self.src));
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}
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tree::Event::Exit => {
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self.parser = None;
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return Some(Event::End);
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}
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tree::Event::Enter(..) => unreachable!(),
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}
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2022-11-20 13:13:48 -05:00
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}
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2022-11-22 13:19:21 -05:00
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}
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self.tree.next().map(|ev| match ev {
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2022-11-20 13:13:48 -05:00
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tree::Event::Element(atom, _sp) => {
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assert_eq!(*atom, block::Atom::Blankline);
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Event::Blankline
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}
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tree::Event::Enter(block @ block::Block::Container(..), ..) => {
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Event::Start(block.clone())
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}
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tree::Event::Enter(block @ block::Block::Leaf(..), ..) => {
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self.parser = Some(inline::Parser::new());
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Event::Start(block.clone())
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}
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tree::Event::Exit => Event::End,
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2022-11-20 13:13:48 -05:00
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})
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}
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}
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2022-11-22 13:19:21 -05:00
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#[cfg(test)]
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mod test {
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use super::Event::*;
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use crate::block::Block::*;
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use crate::block::Container::*;
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use crate::block::Leaf::*;
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use crate::inline::Atom::*;
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use crate::inline::Event::*;
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#[test]
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fn basic() {
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assert_eq!(
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super::Parser::new("abc").iter().collect::<Vec<_>>(),
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&[Start(Leaf(Paragraph)), Inline(Atom(Str)), End]
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);
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}
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}
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