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|
//! Title occurs in [definition][] and 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
//!
//! <!-- To do: link label end. -->
// To do: pass token types in.
use crate::construct::partial_space_or_tab::space_or_tab_opt;
use crate::tokenizer::{Code, State, StateFnResult, TokenType, Tokenizer};
use crate::util::link::link;
/// Type of title.
#[derive(Debug, PartialEq)]
enum Kind {
/// In a parenthesized (`(` and `)`) title.
///
/// ## Example
///
/// ```markdown
/// [a] b (c)
/// ```
Paren,
/// In a double quoted (`"`) title.
///
/// ## Example
///
/// ```markdown
/// [a] b "c"
/// ```
Double,
/// In a single quoted (`'`) title.
///
/// ## Example
///
/// ```markdown
/// [a] b 'c'
/// ```
Single,
}
impl Kind {
/// Turn the kind into a [char].
///
/// > 👉 **Note**: a closing paren is used.
fn as_char(&self) -> char {
match self {
Kind::Paren => ')',
Kind::Double => '"',
Kind::Single => '\'',
}
}
/// Turn a [char] into a kind.
///
/// > 👉 **Note**: an opening paren must be used.
///
/// ## Panics
///
/// Panics if `char` is not `(`, `"`, or `'`.
fn from_char(char: char) -> Kind {
match char {
'(' => Kind::Paren,
'"' => Kind::Double,
'\'' => Kind::Single,
_ => unreachable!("invalid char"),
}
}
}
/// Before a title.
///
/// ```markdown
/// |"a"
/// |'a'
/// |(a)
/// ```
pub fn start(tokenizer: &mut Tokenizer, code: Code) -> StateFnResult {
match code {
Code::Char(char) if char == '(' || char == '"' || char == '\'' => {
let kind = Kind::from_char(char);
tokenizer.enter(TokenType::DefinitionTitle);
tokenizer.enter(TokenType::DefinitionTitleMarker);
tokenizer.consume(code);
tokenizer.exit(TokenType::DefinitionTitleMarker);
(State::Fn(Box::new(|t, c| begin(t, c, kind))), None)
}
_ => (State::Nok, None),
}
}
/// After the opening marker.
///
/// This is also used when at the closing marker.
///
/// ```markdown
/// "|a"
/// '|a'
/// (|a)
/// ```
fn begin(tokenizer: &mut Tokenizer, code: Code, kind: Kind) -> StateFnResult {
match code {
Code::Char(char) if char == kind.as_char() => {
tokenizer.enter(TokenType::DefinitionTitleMarker);
tokenizer.consume(code);
tokenizer.exit(TokenType::DefinitionTitleMarker);
tokenizer.exit(TokenType::DefinitionTitle);
(State::Ok, None)
}
_ => {
tokenizer.enter(TokenType::DefinitionTitleString);
at_break(tokenizer, code, kind, false)
}
}
}
/// At something, before something else.
///
/// ```markdown
/// "|a"
/// 'a|'
/// (a|
/// b)
/// ```
fn at_break(tokenizer: &mut Tokenizer, code: Code, kind: Kind, connect: bool) -> StateFnResult {
match code {
Code::Char(char) if char == kind.as_char() => {
tokenizer.exit(TokenType::DefinitionTitleString);
begin(tokenizer, code, kind)
}
Code::None => (State::Nok, None),
_ => {
tokenizer.enter(TokenType::ChunkString);
if connect {
let index = tokenizer.events.len() - 1;
link(&mut tokenizer.events, index);
}
title(tokenizer, code, kind)
}
}
}
/// After a line ending.
///
/// ```markdown
/// "a
/// |b"
/// ```
fn line_start(tokenizer: &mut Tokenizer, code: Code, kind: Kind) -> StateFnResult {
tokenizer.go(space_or_tab_opt(), |t, c| line_begin(t, c, kind))(tokenizer, code)
}
/// After a line ending, after optional whitespace.
///
/// ```markdown
/// "a
/// |b"
/// ```
fn line_begin(tokenizer: &mut Tokenizer, code: Code, kind: Kind) -> StateFnResult {
match code {
// Blank line not allowed.
Code::CarriageReturnLineFeed | Code::Char('\r' | '\n') => (State::Nok, None),
_ => at_break(tokenizer, code, kind, true),
}
}
/// In title text.
///
/// ```markdown
/// "a|b"
/// ```
fn title(tokenizer: &mut Tokenizer, code: Code, kind: Kind) -> StateFnResult {
match code {
Code::Char(char) if char == kind.as_char() => {
tokenizer.exit(TokenType::ChunkString);
at_break(tokenizer, code, kind, true)
}
Code::None => {
tokenizer.exit(TokenType::ChunkString);
at_break(tokenizer, code, kind, true)
}
Code::CarriageReturnLineFeed | Code::Char('\r' | '\n') => {
tokenizer.consume(code);
tokenizer.exit(TokenType::ChunkString);
(State::Fn(Box::new(|t, c| line_start(t, c, kind))), None)
}
Code::Char('\\') => {
tokenizer.consume(code);
(State::Fn(Box::new(|t, c| escape(t, c, kind))), None)
}
_ => {
tokenizer.consume(code);
(State::Fn(Box::new(|t, c| title(t, c, kind))), None)
}
}
}
/// After `\`, in title text.
///
/// ```markdown
/// "a\|"b"
/// ```
fn escape(tokenizer: &mut Tokenizer, code: Code, kind: Kind) -> StateFnResult {
match code {
Code::Char(char) if char == kind.as_char() => {
tokenizer.consume(code);
(State::Fn(Box::new(|t, c| title(t, c, kind))), None)
}
_ => title(tokenizer, code, kind),
}
}
|
