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//! Paragraph is a construct that occurs in the [flow] content type.
//!
//! They’re formed with the following BNF:
//!
//! ```bnf
//! ; Restriction: lines cannot start other flow constructs.
//! ; Restriction: lines cannot be blank.
//! paragraph ::= 1*line *( eol 1*line )
//! ```
//!
//! Paragraphs in markdown relate to the `<p>` element in HTML.
//! See [*§ 4.4.1 The `p` element* in the HTML spec][html] for more info.
//!
//! Paragraphs can contain line endings and whitespace, but they are not
//! allowed to contain blank lines, or to be blank themselves.
//!
//! The paragraph is interpreted as the [text][] content type.
//! That means that [autolinks][autolink], [code (text)][code_text], etc are allowed.
//!
//! ## References
//!
//! * [`content.js` in `micromark`](https://github.com/micromark/micromark/blob/main/packages/micromark-core-commonmark/dev/lib/content.js)
//! * [*§ 4.8 Paragraphs* in `CommonMark`](https://spec.commonmark.org/0.30/#paragraphs)
//!
//! [flow]: crate::content::flow
//! [text]: crate::content::text
//! [autolink]: crate::construct::autolink
//! [code_text]: crate::construct::code_text
//! [html]: https://html.spec.whatwg.org/multipage/grouping-content.html#the-p-element
use crate::constant::TAB_SIZE;
use crate::construct::{
blank_line::start as blank_line, code_fenced::start as code_fenced,
heading_atx::start as heading_atx, html_flow::start as html_flow,
partial_space_or_tab::space_or_tab_min_max, thematic_break::start as thematic_break,
};
use crate::tokenizer::{Code, State, StateFnResult, TokenType, Tokenizer};
use crate::util::link::link;
/// Before a paragraph.
///
/// ```markdown
/// |qwe
/// ```
pub fn start(tokenizer: &mut Tokenizer, code: Code) -> StateFnResult {
match code {
Code::None | Code::CarriageReturnLineFeed | Code::Char('\n' | '\r') => {
unreachable!("unexpected eol/eof at start of paragraph")
}
_ => {
tokenizer.enter(TokenType::Paragraph);
tokenizer.enter(TokenType::ChunkText);
inside(tokenizer, code)
}
}
}
/// In a paragraph.
///
/// ```markdown
/// al|pha
/// ```
fn inside(tokenizer: &mut Tokenizer, code: Code) -> StateFnResult {
match code {
Code::None => end(tokenizer, code),
Code::CarriageReturnLineFeed | Code::Char('\n' | '\r') => tokenizer
.check(interrupt, |ok| {
Box::new(if ok { at_line_ending } else { end })
})(tokenizer, code),
_ => {
tokenizer.consume(code);
(State::Fn(Box::new(inside)), None)
}
}
}
/// At a line ending, not interrupting.
///
/// ```markdown
/// alpha|
/// bravo.
/// ```
fn at_line_ending(tokenizer: &mut Tokenizer, code: Code) -> StateFnResult {
tokenizer.consume(code);
tokenizer.exit(TokenType::ChunkText);
tokenizer.enter(TokenType::ChunkText);
let index = tokenizer.events.len() - 1;
link(&mut tokenizer.events, index);
(State::Fn(Box::new(inside)), None)
}
/// At a line ending, done.
///
/// ```markdown
/// alpha|
/// ***
/// ```
fn end(tokenizer: &mut Tokenizer, code: Code) -> StateFnResult {
tokenizer.exit(TokenType::ChunkText);
tokenizer.exit(TokenType::Paragraph);
(State::Ok, Some(vec![code]))
}
/// Before a potential interruption.
///
/// ```markdown
/// alpha|
/// ***
/// ```
fn interrupt(tokenizer: &mut Tokenizer, code: Code) -> StateFnResult {
match code {
Code::CarriageReturnLineFeed | Code::Char('\n' | '\r') => {
tokenizer.enter(TokenType::LineEnding);
tokenizer.consume(code);
tokenizer.exit(TokenType::LineEnding);
(State::Fn(Box::new(interrupt_start)), None)
}
_ => unreachable!("expected eol"),
}
}
/// After a line ending.
///
/// ```markdown
/// alpha
/// |~~~js
/// ~~~
/// ```
fn interrupt_start(tokenizer: &mut Tokenizer, code: Code) -> StateFnResult {
// To do: If code is disabled, indented lines are allowed to interrupt.
tokenizer.attempt(space_or_tab_min_max(TAB_SIZE, TAB_SIZE), |ok| {
if ok {
Box::new(|_t, code| (State::Ok, Some(vec![code])))
} else {
Box::new(|tokenizer, code| {
tokenizer.attempt_5(
blank_line,
code_fenced,
html_flow,
heading_atx,
thematic_break,
|ok| {
Box::new(move |_t, code| {
(if ok { State::Nok } else { State::Ok }, Some(vec![code]))
})
},
)(tokenizer, code)
})
}
})(tokenizer, code)
}
|
