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|
//! Content occurs in the [flow][] content type.
//!
//! Content contains zero or more [definition][definition]s, followed by zero
//! or one [paragraph][].
//!
//! The constructs found in flow are:
//!
//! * [Definition][crate::construct::definition]
//! * [Paragraph][crate::construct::paragraph]
//!
//! ## Tokens
//!
//! * [`Content`][Name::Content]
//!
//! > 👉 **Note**: while parsing, [`Content`][Name::Content]
//! > is used, which is later compiled away.
//!
//! ## References
//!
//! * [`content.js` in `micromark`](https://github.com/micromark/micromark/blob/main/packages/micromark-core-commonmark/dev/lib/content.js)
//!
//! [flow]: crate::construct::flow
//! [definition]: crate::construct::definition
//! [paragraph]: crate::construct::paragraph
use crate::event::{Content, Kind, Link, Name};
use crate::resolve::Name as ResolveName;
use crate::state::{Name as StateName, State};
use crate::subtokenize::{subtokenize, Subresult};
use crate::tokenizer::Tokenizer;
use alloc::{string::String, vec};
/// Before a content chunk.
///
/// ```markdown
/// > | abc
/// ^
/// ```
pub fn chunk_start(tokenizer: &mut Tokenizer) -> State {
match tokenizer.current {
None | Some(b'\n') => unreachable!("unexpected eol/eof"),
_ => {
tokenizer.enter_link(
Name::Content,
Link {
previous: None,
next: None,
content: Content::Content,
},
);
State::Retry(StateName::ContentChunkInside)
}
}
}
/// In a content chunk.
///
/// ```markdown
/// > | abc
/// ^^^
/// ```
pub fn chunk_inside(tokenizer: &mut Tokenizer) -> State {
match tokenizer.current {
None | Some(b'\n') => {
tokenizer.exit(Name::Content);
tokenizer.register_resolver_before(ResolveName::Content);
// You’d be interrupting.
tokenizer.interrupt = true;
State::Ok
}
_ => {
tokenizer.consume();
State::Next(StateName::ContentChunkInside)
}
}
}
/// Before a definition.
///
/// ```markdown
/// > | [a]: b
/// ^
/// ```
pub fn definition_before(tokenizer: &mut Tokenizer) -> State {
tokenizer.attempt(
State::Next(StateName::ContentDefinitionAfter),
State::Next(StateName::ParagraphStart),
);
State::Retry(StateName::DefinitionStart)
}
/// After a definition.
///
/// ```markdown
/// > | [a]: b
/// ^
/// | c
/// ```
pub fn definition_after(tokenizer: &mut Tokenizer) -> State {
debug_assert!(matches!(tokenizer.current, None | Some(b'\n')));
if tokenizer.current.is_none() {
State::Ok
} else {
tokenizer.enter(Name::LineEnding);
tokenizer.consume();
tokenizer.exit(Name::LineEnding);
State::Next(StateName::ContentDefinitionBefore)
}
}
/// Merge `Content` chunks, which currently span a single line, into actual
/// `Content`s that span multiple lines.
pub fn resolve(tokenizer: &mut Tokenizer) -> Result<Option<Subresult>, String> {
let mut index = 0;
while index < tokenizer.events.len() {
let event = &tokenizer.events[index];
if event.kind == Kind::Enter && event.name == Name::Content {
// Exit:Content
let mut exit_index = index + 1;
loop {
let mut enter_index = exit_index + 1;
if enter_index == tokenizer.events.len()
|| tokenizer.events[enter_index].name != Name::LineEnding
{
break;
}
// Skip past line ending.
enter_index += 2;
// Skip past prefix.
while enter_index < tokenizer.events.len() {
let event = &tokenizer.events[enter_index];
if event.name != Name::SpaceOrTab
&& event.name != Name::BlockQuotePrefix
&& event.name != Name::BlockQuoteMarker
{
break;
}
enter_index += 1;
}
if enter_index == tokenizer.events.len()
|| tokenizer.events[enter_index].name != Name::Content
{
break;
}
// Set Exit:Content point to Exit:LineEnding.
tokenizer.events[exit_index].point = tokenizer.events[exit_index + 2].point.clone();
// Remove Enter:LineEnding, Exit:LineEnding.
tokenizer.map.add(exit_index + 1, 2, vec![]);
// Link Enter:Content to Enter:Content on this line and vice versa.
tokenizer.events[exit_index - 1].link.as_mut().unwrap().next = Some(enter_index);
tokenizer.events[enter_index]
.link
.as_mut()
.unwrap()
.previous = Some(exit_index - 1);
// Potential next start.
exit_index = enter_index + 1;
}
// Move to `Exit:Content`.
index = exit_index;
}
index += 1;
}
tokenizer.map.consume(&mut tokenizer.events);
let result = subtokenize(
&mut tokenizer.events,
tokenizer.parse_state,
&Some(Content::Content),
)?;
Ok(Some(result))
}
|
