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|
//! Title occurs in [definition][] and [label end][label_end].
//!
//! They’re formed with the following BNF:
//!
//! ```bnf
//! ; Restriction: no blank lines.
//! ; Restriction: markers must match (in case of `(` with `)`).
//! title ::= marker [ *( code - '\\' | '\\' [ marker ] ) ] marker
//! marker ::= '"' | '\'' | '('
//! ```
//!
//! Titles can be double quoted (`"a"`), single quoted (`'a'`), or
//! parenthesized (`(a)`).
//!
//! Titles can contain line endings and whitespace, but they are not allowed to
//! contain blank lines.
//! They are allowed to be blank themselves.
//!
//! The title is interpreted as the [string][] content type.
//! That means that [character escapes][character_escape] and
//! [character references][character_reference] are allowed.
//!
//! ## References
//!
//! * [`micromark-factory-title/index.js` in `micromark`](https://github.com/micromark/micromark/blob/main/packages/micromark-factory-title/dev/index.js)
//!
//! [definition]: crate::construct::definition
//! [string]: crate::content::string
//! [character_escape]: crate::construct::character_escape
//! [character_reference]: crate::construct::character_reference
//! [label_end]: crate::construct::label_end
use super::partial_space_or_tab::{space_or_tab_eol_with_options, EolOptions};
use crate::subtokenize::link;
use crate::token::Token;
use crate::tokenizer::{ContentType, State, Tokenizer};
/// Configuration.
///
/// You must pass the token types in that are used.
#[derive(Debug)]
pub struct Options {
/// Token for the whole title.
pub title: Token,
/// Token for the marker.
pub marker: Token,
/// Token for the string inside the quotes.
pub string: Token,
}
/// Type of title.
#[derive(Debug, PartialEq)]
enum Kind {
/// In a parenthesized (`(` and `)`) title.
///
/// ## Example
///
/// ```markdown
/// (a)
/// ```
Paren,
/// In a double quoted (`"`) title.
///
/// ## Example
///
/// ```markdown
/// "a"
/// ```
Double,
/// In a single quoted (`'`) title.
///
/// ## Example
///
/// ```markdown
/// 'a'
/// ```
Single,
}
impl Kind {
/// Turn the kind into a byte ([u8]).
///
/// > 👉 **Note**: a closing paren is used for `Kind::Paren`.
fn as_byte(&self) -> u8 {
match self {
Kind::Paren => b')',
Kind::Double => b'"',
Kind::Single => b'\'',
}
}
/// Turn a byte ([u8]) into a kind.
///
/// > 👉 **Note**: an opening paren must be used for `Kind::Paren`.
///
/// ## Panics
///
/// Panics if `byte` is not `(`, `"`, or `'`.
fn from_byte(byte: u8) -> Kind {
match byte {
b'(' => Kind::Paren,
b'"' => Kind::Double,
b'\'' => Kind::Single,
_ => unreachable!("invalid byte"),
}
}
}
/// State needed to parse titles.
#[derive(Debug)]
struct Info {
/// Whether we’ve seen data.
connect: bool,
/// Kind of title.
kind: Kind,
/// Configuration.
options: Options,
}
/// Before a title.
///
/// ```markdown
/// > | "a"
/// ^
/// ```
pub fn start(tokenizer: &mut Tokenizer, options: Options) -> State {
match tokenizer.current {
Some(byte) if matches!(byte, b'"' | b'\'' | b'(') => {
let info = Info {
connect: false,
kind: Kind::from_byte(byte),
options,
};
tokenizer.enter(info.options.title.clone());
tokenizer.enter(info.options.marker.clone());
tokenizer.consume();
tokenizer.exit(info.options.marker.clone());
State::Fn(Box::new(|t| begin(t, info)))
}
_ => State::Nok,
}
}
/// After the opening marker.
///
/// This is also used when at the closing marker.
///
/// ```markdown
/// > | "a"
/// ^
/// ```
fn begin(tokenizer: &mut Tokenizer, info: Info) -> State {
match tokenizer.current {
Some(byte) if byte == info.kind.as_byte() => {
tokenizer.enter(info.options.marker.clone());
tokenizer.consume();
tokenizer.exit(info.options.marker.clone());
tokenizer.exit(info.options.title);
State::Ok
}
_ => {
tokenizer.enter(info.options.string.clone());
at_break(tokenizer, info)
}
}
}
/// At something, before something else.
///
/// ```markdown
/// > | "a"
/// ^
/// ```
fn at_break(tokenizer: &mut Tokenizer, mut info: Info) -> State {
match tokenizer.current {
Some(byte) if byte == info.kind.as_byte() => {
tokenizer.exit(info.options.string.clone());
begin(tokenizer, info)
}
None => State::Nok,
Some(b'\n') => tokenizer.go(
space_or_tab_eol_with_options(EolOptions {
content_type: Some(ContentType::String),
connect: info.connect,
}),
|t| {
info.connect = true;
at_break(t, info)
},
)(tokenizer),
_ => {
tokenizer.enter_with_content(Token::Data, Some(ContentType::String));
if info.connect {
let index = tokenizer.events.len() - 1;
link(&mut tokenizer.events, index);
} else {
info.connect = true;
}
title(tokenizer, info)
}
}
}
/// In title text.
///
/// ```markdown
/// > | "a"
/// ^
/// ```
fn title(tokenizer: &mut Tokenizer, info: Info) -> State {
match tokenizer.current {
Some(byte) if byte == info.kind.as_byte() => {
tokenizer.exit(Token::Data);
at_break(tokenizer, info)
}
None | Some(b'\n') => {
tokenizer.exit(Token::Data);
at_break(tokenizer, info)
}
Some(b'\\') => {
tokenizer.consume();
State::Fn(Box::new(|t| escape(t, info)))
}
_ => {
tokenizer.consume();
State::Fn(Box::new(|t| title(t, info)))
}
}
}
/// After `\`, in title text.
///
/// ```markdown
/// > | "a\*b"
/// ^
/// ```
fn escape(tokenizer: &mut Tokenizer, info: Info) -> State {
match tokenizer.current {
Some(byte) if byte == info.kind.as_byte() => {
tokenizer.consume();
State::Fn(Box::new(|t| title(t, info)))
}
_ => title(tokenizer, info),
}
}
|
