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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 crate::construct::partial_space_or_tab_eol::{space_or_tab_eol_with_options, Options};
use crate::event::{Content, Name};
use crate::state::{Name as StateName, State};
use crate::subtokenize::link;
use crate::tokenizer::Tokenizer;
/// Before a title.
///
/// ```markdown
/// > | "a"
/// ^
/// ```
pub fn start(tokenizer: &mut Tokenizer) -> State {
match tokenizer.current {
Some(b'"' | b'\'' | b'(') => {
let marker = tokenizer.current.unwrap();
tokenizer.tokenize_state.marker = if marker == b'(' { b')' } else { marker };
tokenizer.enter(tokenizer.tokenize_state.token_1.clone());
tokenizer.enter(tokenizer.tokenize_state.token_2.clone());
tokenizer.consume();
tokenizer.exit(tokenizer.tokenize_state.token_2.clone());
State::Next(StateName::TitleBegin)
}
_ => State::Nok,
}
}
/// After the opening marker.
///
/// This is also used when at the closing marker.
///
/// ```markdown
/// > | "a"
/// ^
/// ```
pub fn begin(tokenizer: &mut Tokenizer) -> State {
match tokenizer.current {
Some(b'"' | b'\'' | b')')
if tokenizer.current.unwrap() == tokenizer.tokenize_state.marker =>
{
tokenizer.enter(tokenizer.tokenize_state.token_2.clone());
tokenizer.consume();
tokenizer.exit(tokenizer.tokenize_state.token_2.clone());
tokenizer.exit(tokenizer.tokenize_state.token_1.clone());
tokenizer.tokenize_state.marker = 0;
tokenizer.tokenize_state.connect = false;
State::Ok
}
_ => {
tokenizer.enter(tokenizer.tokenize_state.token_3.clone());
State::Retry(StateName::TitleAtBreak)
}
}
}
/// At something, before something else.
///
/// ```markdown
/// > | "a"
/// ^
/// ```
pub fn at_break(tokenizer: &mut Tokenizer) -> State {
match tokenizer.current {
None => {
tokenizer.tokenize_state.marker = 0;
tokenizer.tokenize_state.connect = false;
State::Nok
}
Some(b'\n') => {
tokenizer.attempt(
State::Next(StateName::TitleAfterEol),
State::Next(StateName::TitleAtBlankLine),
);
State::Retry(space_or_tab_eol_with_options(
tokenizer,
Options {
content_type: Some(Content::String),
connect: tokenizer.tokenize_state.connect,
},
))
}
Some(b'"' | b'\'' | b')')
if tokenizer.current.unwrap() == tokenizer.tokenize_state.marker =>
{
tokenizer.exit(tokenizer.tokenize_state.token_3.clone());
State::Retry(StateName::TitleBegin)
}
Some(_) => {
tokenizer.enter_with_content(Name::Data, Some(Content::String));
if tokenizer.tokenize_state.connect {
let index = tokenizer.events.len() - 1;
link(&mut tokenizer.events, index);
} else {
tokenizer.tokenize_state.connect = true;
}
State::Retry(StateName::TitleInside)
}
}
}
/// In a title, after whitespace.
///
/// ```markdown
/// | "a␊
/// > | b"
/// ^
/// ```
pub fn after_eol(tokenizer: &mut Tokenizer) -> State {
tokenizer.tokenize_state.connect = true;
State::Retry(StateName::TitleAtBreak)
}
/// In a title, at a blank line.
///
/// ```markdown
/// | "a␊
/// > | ␊
/// ^
/// | b"
/// ```
pub fn at_blank_line(tokenizer: &mut Tokenizer) -> State {
tokenizer.tokenize_state.marker = 0;
tokenizer.tokenize_state.connect = false;
State::Nok
}
/// In title text.
///
/// ```markdown
/// > | "a"
/// ^
/// ```
pub fn inside(tokenizer: &mut Tokenizer) -> State {
match tokenizer.current {
None | Some(b'\n') => {
tokenizer.exit(Name::Data);
State::Retry(StateName::TitleAtBreak)
}
Some(b'"' | b'\'' | b')')
if tokenizer.current.unwrap() == tokenizer.tokenize_state.marker =>
{
tokenizer.exit(Name::Data);
State::Retry(StateName::TitleAtBreak)
}
Some(byte) => {
tokenizer.consume();
State::Next(if matches!(byte, b'\\') {
StateName::TitleEscape
} else {
StateName::TitleInside
})
}
}
}
/// After `\`, in title text.
///
/// ```markdown
/// > | "a\*b"
/// ^
/// ```
pub fn escape(tokenizer: &mut Tokenizer) -> State {
match tokenizer.current {
Some(b'"' | b'\'' | b')') => {
tokenizer.consume();
State::Next(StateName::TitleInside)
}
_ => State::Retry(StateName::TitleInside),
}
}
|
