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//! Data occurs in the [string][] and [text][] content types.
//!
//! It can include anything (except for line endings) and stops at certain
//! characters.
//!
//! [string]: crate::construct::string
//! [text]: crate::construct::text
use crate::event::{Kind, Name};
use crate::state::{Name as StateName, State};
use crate::subtokenize::Subresult;
use crate::tokenizer::Tokenizer;
use alloc::vec;
/// At beginning of data.
///
/// ```markdown
/// > | abc
/// ^
/// ```
pub fn start(tokenizer: &mut Tokenizer) -> State {
// Make sure to eat the first `markers`.
if let Some(byte) = tokenizer.current {
if tokenizer.tokenize_state.markers.contains(&byte) {
tokenizer.enter(Name::Data);
tokenizer.consume();
return State::Next(StateName::DataInside);
}
}
State::Retry(StateName::DataAtBreak)
}
/// Before something.
///
/// ```markdown
/// > | abc
/// ^
/// ```
pub fn at_break(tokenizer: &mut Tokenizer) -> State {
if let Some(byte) = tokenizer.current {
if !tokenizer.tokenize_state.markers.contains(&byte) {
if byte == b'\n' {
tokenizer.enter(Name::LineEnding);
tokenizer.consume();
tokenizer.exit(Name::LineEnding);
return State::Next(StateName::DataAtBreak);
}
tokenizer.enter(Name::Data);
return State::Retry(StateName::DataInside);
}
}
State::Ok
}
/// In data.
///
/// ```markdown
/// > | abc
/// ^^^
/// ```
pub fn inside(tokenizer: &mut Tokenizer) -> State {
if let Some(byte) = tokenizer.current {
if byte != b'\n' && !tokenizer.tokenize_state.markers.contains(&byte) {
tokenizer.consume();
return State::Next(StateName::DataInside);
}
}
tokenizer.exit(Name::Data);
State::Retry(StateName::DataAtBreak)
}
/// Merge adjacent data events.
pub fn resolve(tokenizer: &mut Tokenizer) -> Option<Subresult> {
let mut index = 0;
// Loop through events and merge adjacent data events.
while index < tokenizer.events.len() {
let event = &tokenizer.events[index];
if event.kind == Kind::Enter && event.name == Name::Data {
// Move to exit.
index += 1;
let mut exit_index = index;
// Find the farthest `data` event exit event.
while exit_index + 1 < tokenizer.events.len()
&& tokenizer.events[exit_index + 1].name == Name::Data
{
exit_index += 2;
}
if exit_index > index {
tokenizer.map.add(index, exit_index - index, vec![]);
// Change positional info.
tokenizer.events[index].point = tokenizer.events[exit_index].point.clone();
// Move to the end.
index = exit_index;
}
}
index += 1;
}
None
}
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