2022-11-21 13:44:59 -05:00
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use crate::lex;
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use crate::Span;
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2022-11-21 13:44:59 -05:00
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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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Attributes,
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// typesetting
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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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RawFormat,
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InlineMath,
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DisplayMath,
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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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}
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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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#[derive(Debug, Clone, Copy)]
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pub 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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pub struct Parser<'s> {
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openers: Vec<(Container, usize)>,
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events: std::collections::VecDeque<Event>,
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span: Span,
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lexer: lex::Lexer<'s>,
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verbatim: Option<(Container, usize)>,
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last: bool,
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}
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impl<'s> Parser<'s> {
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pub fn new() -> Self {
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Self {
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openers: Vec::new(),
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events: std::collections::VecDeque::new(),
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span: Span::new(0, 0),
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lexer: lex::Lexer::new(""),
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verbatim: None,
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last: false,
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}
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}
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pub fn parse(&mut self, src: &'s str, last: bool) {
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self.lexer = lex::Lexer::new(src);
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if last {
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assert!(!self.last);
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}
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self.last = last;
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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_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_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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fn parse_verbatim(&mut self, first: &lex::Token) -> Option<Event> {
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self.verbatim
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.map(|(kind, opener_len)| {
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let kind = if matches!(first.kind, lex::Kind::Seq(lex::Sequence::Backtick))
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&& first.len == opener_len
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{
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self.verbatim = None;
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EventKind::Exit(kind)
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} else {
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EventKind::Str
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};
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Event {
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kind,
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span: self.span,
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}
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})
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.or_else(|| {
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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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Container::DisplayMath
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} else {
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Container::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) => {
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Some((Container::Verbatim, first.len))
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}
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_ => None,
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}
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.map(|(kind, opener_len)| {
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self.verbatim = Some((kind, opener_len));
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Event {
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kind: EventKind::Enter(kind),
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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 parse_container(&mut self, first: &lex::Token) -> Option<Event> {
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match first.kind {
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lex::Kind::Sym(Symbol::Asterisk) => Some((Strong, Dir::Both)),
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lex::Kind::Sym(Symbol::Underscore) => Some((Emphasis, Dir::Both)),
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lex::Kind::Sym(Symbol::Caret) => Some((Superscript, Dir::Both)),
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lex::Kind::Sym(Symbol::Tilde) => Some((Subscript, Dir::Both)),
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lex::Kind::Sym(Symbol::Quote1) => Some((SingleQuoted, Dir::Both)),
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lex::Kind::Sym(Symbol::Quote2) => Some((DoubleQuoted, Dir::Both)),
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lex::Kind::Open(Delimiter::Bracket) => Some((Span, Dir::Open)),
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lex::Kind::Close(Delimiter::Bracket) => Some((Span, Dir::Close)),
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lex::Kind::Open(Delimiter::BraceAsterisk) => Some((Strong, Dir::Open)),
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lex::Kind::Close(Delimiter::BraceAsterisk) => Some((Strong, Dir::Close)),
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lex::Kind::Open(Delimiter::BraceCaret) => Some((Superscript, Dir::Open)),
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lex::Kind::Close(Delimiter::BraceCaret) => Some((Superscript, Dir::Close)),
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lex::Kind::Open(Delimiter::BraceEqual) => Some((Mark, Dir::Open)),
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lex::Kind::Close(Delimiter::BraceEqual) => Some((Mark, Dir::Close)),
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lex::Kind::Open(Delimiter::BraceHyphen) => Some((Delete, Dir::Open)),
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lex::Kind::Close(Delimiter::BraceHyphen) => Some((Delete, Dir::Close)),
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lex::Kind::Open(Delimiter::BracePlus) => Some((Insert, Dir::Open)),
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lex::Kind::Close(Delimiter::BracePlus) => Some((Insert, Dir::Close)),
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lex::Kind::Open(Delimiter::BraceTilde) => Some((Subscript, Dir::Open)),
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lex::Kind::Close(Delimiter::BraceTilde) => Some((Subscript, Dir::Close)),
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lex::Kind::Open(Delimiter::BraceUnderscore) => Some((Emphasis, Dir::Open)),
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lex::Kind::Close(Delimiter::BraceUnderscore) => Some((Emphasis, Dir::Close)),
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_ => None,
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}
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.map(|(cont, dir)| {
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self.openers
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.iter()
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.rposition(|(c, _)| *c == cont)
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.and_then(|o| {
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matches!(dir, Dir::Close | Dir::Both).then(|| {
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let (_, e) = &mut self.openers[o];
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self.events[*e].kind = EventKind::Enter(cont);
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self.openers.drain(o..);
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EventKind::Exit(cont)
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})
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})
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.unwrap_or_else(|| {
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self.openers.push((cont, self.events.len()));
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// use str for now, replace if closed later
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EventKind::Str
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})
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})
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.map(|kind| Event {
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kind,
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span: self.span,
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})
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}
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}
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impl<'s> Iterator for Parser<'s> {
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type Item = Event;
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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
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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
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.pop_front()
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.map(|e| {
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if matches!(e.kind, EventKind::Str) {
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// merge str events
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let mut span = e.span;
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while self
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.events
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.front()
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.map_or(false, |ev| matches!(ev.kind, EventKind::Str))
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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);
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}
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Event {
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kind: EventKind::Str,
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span,
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}
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} else {
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e
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}
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})
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.or_else(|| {
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if self.last {
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self.verbatim.take().map(|(kind, _)| Event {
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kind: EventKind::Exit(kind),
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span: self.span,
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})
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} else {
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None
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}
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2022-12-08 11:42:54 -05:00
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|
|
})
|
2022-11-27 18:34:30 -05:00
|
|
|
}
|
|
|
|
}
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|
|
|
|
2022-11-21 16:40:11 -05:00
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|
#[cfg(test)]
|
|
|
|
mod test {
|
2022-11-26 19:12:56 -05:00
|
|
|
use crate::Span;
|
|
|
|
|
2022-11-21 16:40:11 -05:00
|
|
|
use super::Atom::*;
|
2022-11-22 13:19:21 -05:00
|
|
|
use super::Container::*;
|
2022-11-27 18:10:28 -05:00
|
|
|
use super::EventKind::*;
|
2022-12-08 11:42:54 -05:00
|
|
|
use super::Verbatim;
|
2022-11-21 16:40:11 -05:00
|
|
|
|
2022-11-22 13:48:17 -05:00
|
|
|
macro_rules! test_parse {
|
|
|
|
($($st:ident,)? $src:expr $(,$($token:expr),* $(,)?)?) => {
|
|
|
|
#[allow(unused)]
|
|
|
|
let mut p = super::Parser::new();
|
2022-12-08 11:42:54 -05:00
|
|
|
p.parse($src, true);
|
2022-11-28 14:12:49 -05:00
|
|
|
let actual = p.map(|ev| (ev.kind, ev.span.of($src))).collect::<Vec<_>>();
|
2022-11-22 13:48:17 -05:00
|
|
|
let expected = &[$($($token),*,)?];
|
|
|
|
assert_eq!(actual, expected, "\n\n{}\n\n", $src);
|
|
|
|
};
|
|
|
|
}
|
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn str() {
|
2022-12-08 11:42:54 -05:00
|
|
|
test_parse!("abc", (Str, "abc"));
|
|
|
|
test_parse!("abc def", (Str, "abc def"));
|
2022-11-26 19:12:56 -05:00
|
|
|
}
|
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn verbatim() {
|
2022-12-08 11:42:54 -05:00
|
|
|
test_parse!(
|
|
|
|
"`abc`",
|
|
|
|
(Enter(Verbatim), "`"),
|
|
|
|
(Str, "abc"),
|
|
|
|
(Exit(Verbatim), "`"),
|
|
|
|
);
|
|
|
|
test_parse!(
|
|
|
|
"`abc\ndef`",
|
|
|
|
(Enter(Verbatim), "`"),
|
|
|
|
(Str, "abc\ndef"),
|
|
|
|
(Exit(Verbatim), "`"),
|
|
|
|
);
|
|
|
|
test_parse!(
|
|
|
|
"`abc&def`",
|
|
|
|
(Enter(Verbatim), "`"),
|
|
|
|
(Str, "abc&def"),
|
|
|
|
(Exit(Verbatim), "`"),
|
|
|
|
);
|
|
|
|
test_parse!(
|
|
|
|
"`abc",
|
|
|
|
(Enter(Verbatim), "`"),
|
|
|
|
(Str, "abc"),
|
|
|
|
(Exit(Verbatim), ""),
|
|
|
|
);
|
|
|
|
test_parse!(
|
|
|
|
"``abc``",
|
|
|
|
(Enter(Verbatim), "``"),
|
|
|
|
(Str, "abc"),
|
|
|
|
(Exit(Verbatim), "``"),
|
|
|
|
);
|
|
|
|
test_parse!(
|
|
|
|
"abc `def`",
|
|
|
|
(Str, "abc "),
|
|
|
|
(Enter(Verbatim), "`"),
|
|
|
|
(Str, "def"),
|
|
|
|
(Exit(Verbatim), "`"),
|
|
|
|
);
|
|
|
|
test_parse!(
|
|
|
|
"abc`def`",
|
|
|
|
(Str, "abc"),
|
|
|
|
(Enter(Verbatim), "`"),
|
|
|
|
(Str, "def"),
|
|
|
|
(Exit(Verbatim), "`"),
|
|
|
|
);
|
2022-11-26 19:12:56 -05:00
|
|
|
}
|
|
|
|
|
2022-11-27 15:59:54 -05:00
|
|
|
#[test]
|
|
|
|
fn math() {
|
2022-12-08 11:42:54 -05:00
|
|
|
test_parse!(
|
|
|
|
"$`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), "```"),
|
|
|
|
);
|
2022-11-27 15:59:54 -05:00
|
|
|
}
|
|
|
|
|
2022-11-26 19:12:56 -05:00
|
|
|
#[test]
|
|
|
|
fn container_basic() {
|
|
|
|
test_parse!(
|
|
|
|
"_abc_",
|
2022-11-28 14:12:49 -05:00
|
|
|
(Enter(Emphasis), "_"),
|
2022-12-08 11:42:54 -05:00
|
|
|
(Str, "abc"),
|
2022-11-28 14:12:49 -05:00
|
|
|
(Exit(Emphasis), "_"),
|
2022-11-26 19:12:56 -05:00
|
|
|
);
|
|
|
|
test_parse!(
|
|
|
|
"{_abc_}",
|
2022-11-28 14:12:49 -05:00
|
|
|
(Enter(Emphasis), "{_"),
|
2022-12-08 11:42:54 -05:00
|
|
|
(Str, "abc"),
|
2022-11-28 14:12:49 -05:00
|
|
|
(Exit(Emphasis), "_}"),
|
2022-11-26 19:12:56 -05:00
|
|
|
);
|
|
|
|
}
|
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn container_nest() {
|
|
|
|
test_parse!(
|
|
|
|
"{_{_abc_}_}",
|
2022-11-28 14:12:49 -05:00
|
|
|
(Enter(Emphasis), "{_"),
|
|
|
|
(Enter(Emphasis), "{_"),
|
2022-12-08 11:42:54 -05:00
|
|
|
(Str, "abc"),
|
2022-11-28 14:12:49 -05:00
|
|
|
(Exit(Emphasis), "_}"),
|
|
|
|
(Exit(Emphasis), "_}"),
|
2022-11-26 19:12:56 -05:00
|
|
|
);
|
|
|
|
test_parse!(
|
|
|
|
"*_abc_*",
|
2022-11-28 14:12:49 -05:00
|
|
|
(Enter(Strong), "*"),
|
|
|
|
(Enter(Emphasis), "_"),
|
2022-12-08 11:42:54 -05:00
|
|
|
(Str, "abc"),
|
2022-11-28 14:12:49 -05:00
|
|
|
(Exit(Emphasis), "_"),
|
|
|
|
(Exit(Strong), "*"),
|
2022-11-26 19:12:56 -05:00
|
|
|
);
|
|
|
|
}
|
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn container_unopened() {
|
2022-12-08 11:42:54 -05:00
|
|
|
test_parse!("*}abc", (Str, "*}abc"));
|
2022-11-26 19:12:56 -05:00
|
|
|
}
|
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn container_close_parent() {
|
|
|
|
test_parse!(
|
|
|
|
"{*{_abc*}",
|
2022-11-28 14:12:49 -05:00
|
|
|
(Enter(Strong), "{*"),
|
2022-12-08 11:42:54 -05:00
|
|
|
(Str, "{_abc"),
|
2022-11-28 14:12:49 -05:00
|
|
|
(Exit(Strong), "*}"),
|
2022-11-26 19:12:56 -05:00
|
|
|
);
|
2022-11-22 13:48:17 -05:00
|
|
|
}
|
|
|
|
|
2022-11-21 16:40:11 -05:00
|
|
|
#[test]
|
2022-11-26 19:12:56 -05:00
|
|
|
fn container_close_block() {
|
2022-12-08 11:42:54 -05:00
|
|
|
test_parse!("{_abc", (Str, "{_abc"));
|
|
|
|
test_parse!("{_{*{_abc", (Str, "{_{*{_abc"));
|
2022-11-20 13:13:48 -05:00
|
|
|
}
|
|
|
|
}
|