788 lines
24 KiB
Rust
788 lines
24 KiB
Rust
use crate::attr;
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use crate::lex;
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use crate::Span;
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use lex::Delimiter;
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use lex::Symbol;
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use Atom::*;
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use Container::*;
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#[derive(Debug, Clone, PartialEq, Eq)]
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pub enum Atom {
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Softbreak,
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Hardbreak,
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Escape,
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Nbsp,
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Ellipsis,
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EnDash,
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EmDash,
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}
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#[derive(Debug, Copy, Clone, PartialEq, Eq)]
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pub enum Container {
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Span,
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Subscript,
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Superscript,
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Insert,
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Delete,
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Emphasis,
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Strong,
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Mark,
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// smart quoting
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SingleQuoted,
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DoubleQuoted,
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// Verbatim
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Verbatim,
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/// Span is the format.
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RawFormat,
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InlineMath,
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DisplayMath,
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/// Span is the reference link tag.
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ReferenceLink,
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/// Span is the reference link tag.
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ReferenceImage,
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/// Span is the URL.
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InlineLink,
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/// Span is the URL.
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InlineImage,
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Autolink,
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}
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#[derive(Debug, PartialEq, Eq)]
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pub enum EventKind {
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Enter(Container),
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Exit(Container),
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Atom(Atom),
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Str,
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Attributes,
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AttributesDummy,
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}
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#[derive(Debug, PartialEq, Eq)]
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pub struct Event {
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pub kind: EventKind,
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pub span: Span,
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}
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pub struct Parser<I> {
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/// Lexer, hosting upcoming source.
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lexer: lex::Lexer<I>,
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/// Span of current event.
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span: Span,
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/// Stack with kind and index of _potential_ openers for containers.
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openers: Vec<(Delim, usize)>,
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/// Buffer queue for next events. Events are buffered until no modifications due to future
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/// characters are needed.
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events: std::collections::VecDeque<Event>,
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}
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impl<I: Iterator<Item = char> + Clone> Parser<I> {
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pub fn new(chars: I) -> Self {
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Self {
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lexer: lex::Lexer::new(chars),
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span: Span::new(0, 0),
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openers: Vec::new(),
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events: std::collections::VecDeque::new(),
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}
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}
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fn eat(&mut self) -> Option<lex::Token> {
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let tok = self.lexer.next();
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if let Some(t) = &tok {
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self.span = self.span.extend(t.len);
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}
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tok
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}
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fn peek(&mut self) -> Option<&lex::Token> {
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self.lexer.peek()
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}
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fn reset_span(&mut self) {
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self.span = Span::empty_at(self.span.end());
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}
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fn parse_event(&mut self) -> Option<Event> {
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self.reset_span();
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self.eat().map(|first| {
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self.parse_verbatim(&first)
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.or_else(|| self.parse_autolink(&first))
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.or_else(|| self.parse_container(&first))
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.or_else(|| self.parse_atom(&first))
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.unwrap_or(Event {
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kind: EventKind::Str,
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span: self.span,
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})
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})
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}
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fn parse_verbatim(&mut self, first: &lex::Token) -> Option<Event> {
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match first.kind {
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lex::Kind::Seq(lex::Sequence::Dollar) => {
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let math_opt = (first.len <= 2)
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.then(|| {
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if let Some(lex::Token {
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kind: lex::Kind::Seq(lex::Sequence::Backtick),
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len,
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}) = self.peek()
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{
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Some((
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if first.len == 2 {
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DisplayMath
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} else {
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InlineMath
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},
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*len,
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))
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} else {
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None
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}
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})
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.flatten();
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if math_opt.is_some() {
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self.eat(); // backticks
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}
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math_opt
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}
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lex::Kind::Seq(lex::Sequence::Backtick) => Some((Verbatim, first.len)),
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_ => None,
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}
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.map(|(mut kind, opener_len)| {
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let opener_event = self.events.len();
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self.events.push_back(Event {
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kind: EventKind::Enter(kind),
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span: self.span,
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});
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let mut span_inner = Span::empty_at(self.span.end());
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let mut span_outer = None;
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while let Some(t) = self.eat() {
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if matches!(t.kind, lex::Kind::Seq(lex::Sequence::Backtick)) && t.len == opener_len
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{
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if matches!(kind, Verbatim)
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&& matches!(
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self.lexer.peek().map(|t| &t.kind),
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Some(lex::Kind::Open(Delimiter::BraceEqual))
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)
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{
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let mut ahead = self.lexer.inner().clone();
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let mut end = false;
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let len = (&mut ahead)
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.take_while(|c| {
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if *c == '{' {
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return false;
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}
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if *c == '}' {
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end = true;
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};
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!end && !c.is_whitespace()
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})
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.count();
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if len > 0 && end {
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self.lexer = lex::Lexer::new(ahead);
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let span_format = Span::by_len(self.span.end() + "{=".len(), len);
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kind = RawFormat;
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self.events[opener_event].kind = EventKind::Enter(kind);
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self.events[opener_event].span = span_format;
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self.span = span_format.translate(1); // }
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span_outer = Some(span_format);
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}
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}
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break;
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}
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span_inner = span_inner.extend(t.len);
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self.reset_span();
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}
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self.events.push_back(Event {
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kind: EventKind::Str,
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span: span_inner,
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});
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Event {
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kind: EventKind::Exit(kind),
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span: span_outer.unwrap_or(self.span),
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}
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})
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}
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fn parse_autolink(&mut self, first: &lex::Token) -> Option<Event> {
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if first.kind == lex::Kind::Sym(Symbol::Lt) {
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let mut ahead = self.lexer.inner().clone();
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let mut end = false;
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let mut is_url = false;
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let len = (&mut ahead)
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.take_while(|c| {
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if *c == '>' {
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end = true;
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};
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if matches!(*c, ':' | '@') {
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is_url = true;
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}
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!end && !c.is_whitespace()
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})
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.count();
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(end && is_url).then(|| {
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self.lexer = lex::Lexer::new(ahead);
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self.events.push_back(Event {
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kind: EventKind::Enter(Autolink),
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span: self.span,
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});
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self.span = Span::by_len(self.span.end(), len);
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self.events.push_back(Event {
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kind: EventKind::Str,
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span: self.span,
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});
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self.span = Span::by_len(self.span.end(), 1);
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Event {
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kind: EventKind::Exit(Autolink),
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span: self.span,
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}
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})
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} else {
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None
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}
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}
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fn parse_container(&mut self, first: &lex::Token) -> Option<Event> {
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Delim::from_token(first.kind).map(|(delim, dir)| {
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self.openers
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.iter()
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.rposition(|(d, _)| {
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*d == delim || matches!((d, delim), (Delim::Span(..), Delim::Span(..)))
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})
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.and_then(|o| {
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if matches!(dir, Dir::Close | Dir::Both) {
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let (d, e) = self.openers[o];
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let e_attr = e;
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let e_opener = e + 1;
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let event = match Container::try_from(d) {
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Ok(cont) => {
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self.events[e_opener].kind = EventKind::Enter(cont);
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Some(Event {
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kind: EventKind::Exit(cont),
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span: self.span,
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})
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}
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Err(ty) => self.post_span(ty, e_opener),
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};
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self.openers.drain(o..);
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let mut ahead = self.lexer.inner().clone();
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let mut attr_len = attr::valid(&mut ahead);
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if attr_len > 0 {
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self.events[e_attr].span = Span::empty_at(self.span.end());
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self.events[e_attr].kind = EventKind::Attributes;
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while attr_len > 0 {
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self.lexer = lex::Lexer::new(ahead.clone());
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self.span = self.events[e_attr].span.extend(attr_len);
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self.events[e_attr].span = self.span;
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attr_len = attr::valid(&mut ahead);
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}
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}
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event
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} else {
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None
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}
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})
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.unwrap_or_else(|| {
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self.openers.push((delim, self.events.len()));
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// push dummy attributes in case attributes are encountered after closing
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// delimiter
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self.events.push_back(Event {
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kind: EventKind::AttributesDummy,
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span: Span::empty_at(self.span.start()),
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});
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// use str for now, replace if closed later
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Event {
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kind: EventKind::Str,
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span: self.span,
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}
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})
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})
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}
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fn post_span(&mut self, ty: SpanType, opener_event: usize) -> Option<Event> {
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let mut ahead = self.lexer.inner().clone();
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match ahead.next() {
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Some(opener @ ('[' | '(')) => {
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let img = ty == SpanType::Image;
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let (closer, kind) = match opener {
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'[' => (']', if img { ReferenceImage } else { ReferenceLink }),
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'(' => (')', if img { InlineImage } else { InlineLink }),
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_ => unreachable!(),
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};
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let mut end = false;
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let len = (&mut ahead)
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.take_while(|c| {
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if *c == opener {
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return false;
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}
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if *c == closer {
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end = true;
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};
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!end
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})
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.count();
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end.then(|| {
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let span = Span::by_len(self.span.end() + 1, len);
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(kind, span)
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})
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}
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_ => None,
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}
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.map(|(kind, span)| {
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self.lexer = lex::Lexer::new(ahead);
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self.events[opener_event].kind = EventKind::Enter(kind);
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self.events[opener_event].span = span;
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self.span = span.translate(1);
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Event {
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kind: EventKind::Exit(kind),
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span,
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}
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})
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}
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fn parse_atom(&mut self, first: &lex::Token) -> Option<Event> {
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let atom = match first.kind {
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lex::Kind::Newline => Softbreak,
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lex::Kind::Hardbreak => Hardbreak,
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lex::Kind::Escape => Escape,
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lex::Kind::Nbsp => Nbsp,
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lex::Kind::Seq(lex::Sequence::Period) if first.len == 3 => Ellipsis,
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lex::Kind::Seq(lex::Sequence::Hyphen) if first.len == 2 => EnDash,
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lex::Kind::Seq(lex::Sequence::Hyphen) if first.len == 3 => EmDash,
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_ => return None,
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};
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Some(Event {
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kind: EventKind::Atom(atom),
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span: self.span,
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})
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}
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}
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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enum Directionality {
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Uni,
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Bi,
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}
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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enum SpanType {
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Image,
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General,
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}
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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enum Delim {
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Span(SpanType),
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Strong(Directionality),
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Emphasis(Directionality),
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Superscript(Directionality),
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Subscript(Directionality),
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SingleQuoted,
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DoubleQuoted,
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Mark,
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Delete,
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Insert,
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}
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enum Dir {
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Open,
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Close,
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Both,
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}
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impl Delim {
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fn from_token(kind: lex::Kind) -> Option<(Self, Dir)> {
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use Delim::*;
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use Dir::{Both, Close, Open};
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use Directionality::{Bi, Uni};
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use SpanType::{General, Image};
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match kind {
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lex::Kind::Sym(Symbol::Asterisk) => Some((Strong(Bi), Both)),
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lex::Kind::Sym(Symbol::Underscore) => Some((Emphasis(Bi), Both)),
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lex::Kind::Sym(Symbol::Caret) => Some((Superscript(Bi), Both)),
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lex::Kind::Sym(Symbol::Tilde) => Some((Subscript(Bi), Both)),
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lex::Kind::Sym(Symbol::Quote1) => Some((SingleQuoted, Both)),
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lex::Kind::Sym(Symbol::Quote2) => Some((DoubleQuoted, Both)),
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lex::Kind::Sym(Symbol::ExclaimBracket) => Some((Span(Image), Open)),
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lex::Kind::Open(Delimiter::Bracket) => Some((Span(General), Open)),
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lex::Kind::Close(Delimiter::Bracket) => Some((Span(General), Close)),
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lex::Kind::Open(Delimiter::BraceAsterisk) => Some((Strong(Uni), Open)),
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lex::Kind::Close(Delimiter::BraceAsterisk) => Some((Strong(Uni), Close)),
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lex::Kind::Open(Delimiter::BraceUnderscore) => Some((Emphasis(Uni), Open)),
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lex::Kind::Close(Delimiter::BraceUnderscore) => Some((Emphasis(Uni), Close)),
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lex::Kind::Open(Delimiter::BraceCaret) => Some((Superscript(Uni), Open)),
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lex::Kind::Close(Delimiter::BraceCaret) => Some((Superscript(Uni), Close)),
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lex::Kind::Open(Delimiter::BraceTilde) => Some((Subscript(Uni), Open)),
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lex::Kind::Close(Delimiter::BraceTilde) => Some((Subscript(Uni), Close)),
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lex::Kind::Open(Delimiter::BraceEqual) => Some((Mark, Open)),
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lex::Kind::Close(Delimiter::BraceEqual) => Some((Mark, Close)),
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lex::Kind::Open(Delimiter::BraceHyphen) => Some((Delete, Open)),
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lex::Kind::Close(Delimiter::BraceHyphen) => Some((Delete, Close)),
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lex::Kind::Open(Delimiter::BracePlus) => Some((Insert, Open)),
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lex::Kind::Close(Delimiter::BracePlus) => Some((Insert, Close)),
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_ => None,
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}
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}
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}
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|
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impl TryFrom<Delim> for Container {
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type Error = SpanType;
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fn try_from(d: Delim) -> Result<Self, Self::Error> {
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match d {
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Delim::Span(ty) => Err(ty),
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Delim::Strong(..) => Ok(Self::Strong),
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Delim::Emphasis(..) => Ok(Self::Emphasis),
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Delim::Superscript(..) => Ok(Self::Superscript),
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Delim::Subscript(..) => Ok(Self::Subscript),
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Delim::SingleQuoted => Ok(Self::SingleQuoted),
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Delim::DoubleQuoted => Ok(Self::DoubleQuoted),
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Delim::Mark => Ok(Self::Mark),
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Delim::Delete => Ok(Self::Delete),
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Delim::Insert => Ok(Self::Insert),
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}
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}
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}
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|
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impl<I: Iterator<Item = char> + Clone> Iterator for Parser<I> {
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type Item = Event;
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|
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fn next(&mut self) -> Option<Self::Item> {
|
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while self.events.is_empty()
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|| !self.openers.is_empty()
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|| self // for merge
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.events
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.back()
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.map_or(false, |ev| matches!(ev.kind, EventKind::Str))
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{
|
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if let Some(ev) = self.parse_event() {
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self.events.push_back(ev);
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} else {
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break;
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}
|
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}
|
|
|
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self.events.pop_front().and_then(|e| {
|
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match e.kind {
|
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EventKind::Str => {
|
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// merge str events
|
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let mut span = e.span;
|
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while self.events.front().map_or(false, |e| {
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matches!(e.kind, EventKind::Str | EventKind::AttributesDummy)
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}) {
|
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let ev = self.events.pop_front().unwrap();
|
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assert_eq!(span.end(), ev.span.start());
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span = span.union(ev.span);
|
|
}
|
|
Some(Event {
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|
kind: EventKind::Str,
|
|
span,
|
|
})
|
|
}
|
|
EventKind::AttributesDummy => self.next(),
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_ => Some(e),
|
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}
|
|
})
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod test {
|
|
use super::Container::*;
|
|
use super::EventKind::*;
|
|
use super::Verbatim;
|
|
|
|
macro_rules! test_parse {
|
|
($($st:ident,)? $src:expr $(,$($token:expr),* $(,)?)?) => {
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|
#[allow(unused)]
|
|
let mut p = super::Parser::new($src.chars());
|
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let actual = p.map(|ev| (ev.kind, ev.span.of($src))).collect::<Vec<_>>();
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let expected = &[$($($token),*,)?];
|
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assert_eq!(actual, expected, "\n\n{}\n\n", $src);
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};
|
|
}
|
|
|
|
#[test]
|
|
fn str() {
|
|
test_parse!("abc", (Str, "abc"));
|
|
test_parse!("abc def", (Str, "abc def"));
|
|
}
|
|
|
|
#[test]
|
|
fn verbatim() {
|
|
test_parse!(
|
|
"`abc`",
|
|
(Enter(Verbatim), "`"),
|
|
(Str, "abc"),
|
|
(Exit(Verbatim), "`"),
|
|
);
|
|
test_parse!(
|
|
"`abc\ndef`",
|
|
(Enter(Verbatim), "`"),
|
|
(Str, "abc\ndef"),
|
|
(Exit(Verbatim), "`"),
|
|
);
|
|
test_parse!(
|
|
"`abc&def`",
|
|
(Enter(Verbatim), "`"),
|
|
(Str, "abc&def"),
|
|
(Exit(Verbatim), "`"),
|
|
);
|
|
test_parse!(
|
|
"`abc",
|
|
(Enter(Verbatim), "`"),
|
|
(Str, "abc"),
|
|
(Exit(Verbatim), ""),
|
|
);
|
|
test_parse!(
|
|
"``abc``",
|
|
(Enter(Verbatim), "``"),
|
|
(Str, "abc"),
|
|
(Exit(Verbatim), "``"),
|
|
);
|
|
test_parse!(
|
|
"abc `def`",
|
|
(Str, "abc "),
|
|
(Enter(Verbatim), "`"),
|
|
(Str, "def"),
|
|
(Exit(Verbatim), "`"),
|
|
);
|
|
test_parse!(
|
|
"abc`def`",
|
|
(Str, "abc"),
|
|
(Enter(Verbatim), "`"),
|
|
(Str, "def"),
|
|
(Exit(Verbatim), "`"),
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn math() {
|
|
test_parse!(
|
|
"$`abc`",
|
|
(Enter(InlineMath), "$`"),
|
|
(Str, "abc"),
|
|
(Exit(InlineMath), "`"),
|
|
);
|
|
test_parse!(
|
|
"$`abc` str",
|
|
(Enter(InlineMath), "$`"),
|
|
(Str, "abc"),
|
|
(Exit(InlineMath), "`"),
|
|
(Str, " str"),
|
|
);
|
|
test_parse!(
|
|
"$$`abc`",
|
|
(Enter(DisplayMath), "$$`"),
|
|
(Str, "abc"),
|
|
(Exit(DisplayMath), "`"),
|
|
);
|
|
test_parse!(
|
|
"$`abc",
|
|
(Enter(InlineMath), "$`"),
|
|
(Str, "abc"),
|
|
(Exit(InlineMath), ""),
|
|
);
|
|
test_parse!(
|
|
"$```abc```",
|
|
(Enter(InlineMath), "$```"),
|
|
(Str, "abc"),
|
|
(Exit(InlineMath), "```"),
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn raw_format() {
|
|
test_parse!(
|
|
"`raw`{=format}",
|
|
(Enter(RawFormat), "format"),
|
|
(Str, "raw"),
|
|
(Exit(RawFormat), "format"),
|
|
);
|
|
test_parse!(
|
|
"before `raw`{=format} after",
|
|
(Str, "before "),
|
|
(Enter(RawFormat), "format"),
|
|
(Str, "raw"),
|
|
(Exit(RawFormat), "format"),
|
|
(Str, " after"),
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn raw_attr() {
|
|
test_parse!(
|
|
"`raw`{=format #id}",
|
|
(Enter(Verbatim), "`"),
|
|
(Str, "raw"),
|
|
(Exit(Verbatim), "`"),
|
|
(Str, "{=format #id}"),
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn span_tag() {
|
|
test_parse!(
|
|
"[text][tag]",
|
|
(Enter(ReferenceLink), "tag"),
|
|
(Str, "text"),
|
|
(Exit(ReferenceLink), "tag"),
|
|
);
|
|
test_parse!(
|
|
"![text][tag]",
|
|
(Enter(ReferenceImage), "tag"),
|
|
(Str, "text"),
|
|
(Exit(ReferenceImage), "tag"),
|
|
);
|
|
test_parse!(
|
|
"before [text][tag] after",
|
|
(Str, "before "),
|
|
(Enter(ReferenceLink), "tag"),
|
|
(Str, "text"),
|
|
(Exit(ReferenceLink), "tag"),
|
|
(Str, " after"),
|
|
);
|
|
test_parse!(
|
|
"[[inner][i]][o]",
|
|
(Enter(ReferenceLink), "o"),
|
|
(Enter(ReferenceLink), "i"),
|
|
(Str, "inner"),
|
|
(Exit(ReferenceLink), "i"),
|
|
(Exit(ReferenceLink), "o"),
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn span_url() {
|
|
test_parse!(
|
|
"before [text](url) after",
|
|
(Str, "before "),
|
|
(Enter(InlineLink), "url"),
|
|
(Str, "text"),
|
|
(Exit(InlineLink), "url"),
|
|
(Str, " after"),
|
|
);
|
|
test_parse!(
|
|
"[outer [inner](i)](o)",
|
|
(Enter(InlineLink), "o"),
|
|
(Str, "outer "),
|
|
(Enter(InlineLink), "i"),
|
|
(Str, "inner"),
|
|
(Exit(InlineLink), "i"),
|
|
(Exit(InlineLink), "o"),
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn autolink() {
|
|
test_parse!(
|
|
"<https://example.com>",
|
|
(Enter(Autolink), "<"),
|
|
(Str, "https://example.com"),
|
|
(Exit(Autolink), ">")
|
|
);
|
|
test_parse!(
|
|
"<a@b.c>",
|
|
(Enter(Autolink), "<"),
|
|
(Str, "a@b.c"),
|
|
(Exit(Autolink), ">"),
|
|
);
|
|
test_parse!(
|
|
"<http://a.b><http://c.d>",
|
|
(Enter(Autolink), "<"),
|
|
(Str, "http://a.b"),
|
|
(Exit(Autolink), ">"),
|
|
(Enter(Autolink), "<"),
|
|
(Str, "http://c.d"),
|
|
(Exit(Autolink), ">")
|
|
);
|
|
test_parse!("<not-a-url>", (Str, "<not-a-url>"));
|
|
}
|
|
|
|
#[test]
|
|
fn container_basic() {
|
|
test_parse!(
|
|
"_abc_",
|
|
(Enter(Emphasis), "_"),
|
|
(Str, "abc"),
|
|
(Exit(Emphasis), "_"),
|
|
);
|
|
test_parse!(
|
|
"{_abc_}",
|
|
(Enter(Emphasis), "{_"),
|
|
(Str, "abc"),
|
|
(Exit(Emphasis), "_}"),
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn container_nest() {
|
|
test_parse!(
|
|
"{_{_abc_}_}",
|
|
(Enter(Emphasis), "{_"),
|
|
(Enter(Emphasis), "{_"),
|
|
(Str, "abc"),
|
|
(Exit(Emphasis), "_}"),
|
|
(Exit(Emphasis), "_}"),
|
|
);
|
|
test_parse!(
|
|
"*_abc_*",
|
|
(Enter(Strong), "*"),
|
|
(Enter(Emphasis), "_"),
|
|
(Str, "abc"),
|
|
(Exit(Emphasis), "_"),
|
|
(Exit(Strong), "*"),
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn container_unopened() {
|
|
test_parse!("*}abc", (Str, "*}abc"));
|
|
}
|
|
|
|
#[test]
|
|
fn container_close_parent() {
|
|
test_parse!(
|
|
"{*{_abc*}",
|
|
(Enter(Strong), "{*"),
|
|
(Str, "{_abc"),
|
|
(Exit(Strong), "*}"),
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn container_close_block() {
|
|
test_parse!("{_abc", (Str, "{_abc"));
|
|
test_parse!("{_{*{_abc", (Str, "{_{*{_abc"));
|
|
}
|
|
|
|
#[test]
|
|
fn container_attr() {
|
|
test_parse!(
|
|
"_abc def_{.attr}",
|
|
(Attributes, "{.attr}"),
|
|
(Enter(Emphasis), "_"),
|
|
(Str, "abc def"),
|
|
(Exit(Emphasis), "_"),
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn container_attr_multiple() {
|
|
test_parse!(
|
|
"_abc def_{.a}{.b}{.c} {.d}",
|
|
(Attributes, "{.a}{.b}{.c}"),
|
|
(Enter(Emphasis), "_"),
|
|
(Str, "abc def"),
|
|
(Exit(Emphasis), "_"),
|
|
(Str, " {.d}"),
|
|
);
|
|
}
|
|
}
|