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//! Block quote is a construct that occurs in the [document][] content type.
//!
//! It forms with the following BNF:
//!
//! ```bnf
//! block_quote_start ::= '>' [ space_or_tab ]
//! block_quote_cont ::= '>' [ space_or_tab ]
//! ```
//!
//! Further lines that are not prefixed with `block_quote_cont` cause the block
//! quote to be exited, except when those lines are lazy continuation.
//! Like so many things in markdown, block quotes too, are very complex.
//! See [*§ Phase 1: block structure*][commonmark-block] for more on parsing
//! details.
//!
//! Block quote relates to the `<blockquote>` element in HTML.
//! See [*§ 4.4.4 The `blockquote` element*][html-blockquote] in the HTML spec
//! for more info.
//!
//! ## Tokens
//!
//! * [`BlockQuote`][Token::BlockQuote]
//! * [`BlockQuoteMarker`][Token::BlockQuoteMarker]
//! * [`BlockQuotePrefix`][Token::BlockQuotePrefix]
//! * [`SpaceOrTab`][Token::SpaceOrTab]
//!
//! ## References
//!
//! * [`block-quote.js` in `micromark`](https://github.com/micromark/micromark/blob/main/packages/micromark-core-commonmark/dev/lib/block-quote.js)
//! * [*§ 5.1 Block quotes* in `CommonMark`](https://spec.commonmark.org/0.30/#block-quotes)
//!
//! [document]: crate::content::document
//! [html-blockquote]: https://html.spec.whatwg.org/multipage/grouping-content.html#the-blockquote-element
//! [commonmark-block]: https://spec.commonmark.org/0.30/#phase-1-block-structure
use crate::constant::TAB_SIZE;
use crate::construct::partial_space_or_tab::space_or_tab_min_max;
use crate::token::Token;
use crate::tokenizer::{Code, State, Tokenizer};
/// Start of block quote.
///
/// ```markdown
/// > | > a
/// ^
/// ```
pub fn start(tokenizer: &mut Tokenizer, code: Code) -> State {
let max = if tokenizer.parse_state.constructs.code_indented {
TAB_SIZE - 1
} else {
usize::MAX
};
if tokenizer.parse_state.constructs.block_quote {
tokenizer.go(space_or_tab_min_max(0, max), before)(tokenizer, code)
} else {
State::Nok
}
}
/// Start of block quote, after whitespace, before `>`.
///
/// ```markdown
/// > | > a
/// ^
/// ```
fn before(tokenizer: &mut Tokenizer, code: Code) -> State {
match code {
Code::Char('>') => {
tokenizer.enter(Token::BlockQuote);
cont_before(tokenizer, code)
}
_ => cont_before(tokenizer, code),
}
}
/// Start of block quote continuation.
///
/// ```markdown
/// | > a
/// > | > b
/// ^
/// ```
pub fn cont(tokenizer: &mut Tokenizer, code: Code) -> State {
let max = if tokenizer.parse_state.constructs.code_indented {
TAB_SIZE - 1
} else {
usize::MAX
};
tokenizer.go(space_or_tab_min_max(0, max), cont_before)(tokenizer, code)
}
/// After whitespace, before `>`.
///
/// ```markdown
/// | > a
/// > | > b
/// ^
/// ```
fn cont_before(tokenizer: &mut Tokenizer, code: Code) -> State {
match code {
Code::Char('>') => {
tokenizer.enter(Token::BlockQuotePrefix);
tokenizer.enter(Token::BlockQuoteMarker);
tokenizer.consume(code);
tokenizer.exit(Token::BlockQuoteMarker);
State::Fn(Box::new(cont_after))
}
_ => State::Nok,
}
}
/// After `>`, before optional whitespace.
///
/// ```markdown
/// > | > a
/// ^
/// > | >b
/// ^
/// ```
fn cont_after(tokenizer: &mut Tokenizer, code: Code) -> State {
match code {
Code::VirtualSpace | Code::Char('\t' | ' ') => {
tokenizer.enter(Token::SpaceOrTab);
tokenizer.consume(code);
tokenizer.exit(Token::SpaceOrTab);
tokenizer.exit(Token::BlockQuotePrefix);
State::Ok(0)
}
_ => {
tokenizer.exit(Token::BlockQuotePrefix);
State::Ok(0)
}
}
}
|
