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|
//! Data occurs in [text][] and [string][].
//!
//! It can include anything (including line endings), and stops at certain
//! characters.
//!
//! [string]: crate::content::string
//! [text]: crate::content::text
use crate::token::Token;
use crate::tokenizer::{Code, Event, EventType, State, StateFnResult, Tokenizer};
use crate::util::edit_map::EditMap;
/// At the beginning of data.
///
/// ```markdown
/// > | abc
/// ^
/// ```
pub fn start(tokenizer: &mut Tokenizer, code: Code, stop: Vec<Code>) -> StateFnResult {
if stop.contains(&code) {
tokenizer.enter(Token::Data);
tokenizer.consume(code);
(State::Fn(Box::new(|t, c| data(t, c, stop))), None)
} else {
at_break(tokenizer, code, stop)
}
}
/// Before something.
///
/// ```markdown
/// > | abc
/// ^
/// ```
fn at_break(tokenizer: &mut Tokenizer, code: Code, stop: Vec<Code>) -> StateFnResult {
match code {
Code::None => (State::Ok, None),
Code::CarriageReturnLineFeed | Code::Char('\n' | '\r') => {
tokenizer.enter(Token::LineEnding);
tokenizer.consume(code);
tokenizer.exit(Token::LineEnding);
(State::Fn(Box::new(|t, c| at_break(t, c, stop))), None)
}
_ if stop.contains(&code) => {
tokenizer.register_resolver("data".to_string(), Box::new(resolve_data));
(State::Ok, Some(vec![code]))
}
_ => {
tokenizer.enter(Token::Data);
data(tokenizer, code, stop)
}
}
}
/// In data.
///
/// ```markdown
/// > | abc
/// ^^^
/// ```
fn data(tokenizer: &mut Tokenizer, code: Code, stop: Vec<Code>) -> StateFnResult {
let done = match code {
Code::None | Code::CarriageReturnLineFeed | Code::Char('\n' | '\r') => true,
_ if stop.contains(&code) => true,
_ => false,
};
if done {
tokenizer.exit(Token::Data);
at_break(tokenizer, code, stop)
} else {
tokenizer.consume(code);
(State::Fn(Box::new(|t, c| data(t, c, stop))), None)
}
}
/// Merge adjacent data events.
pub fn resolve_data(tokenizer: &mut Tokenizer) -> Vec<Event> {
let mut edit_map = EditMap::new();
let len = tokenizer.events.len();
let mut index = 0;
// Loop through events and merge adjacent data events.
while index < len {
let event = &tokenizer.events[index];
if event.event_type == EventType::Enter && event.token_type == Token::Data {
let exit_index = index + 1;
let mut exit_far_index = exit_index;
// Find multiple `data` events.
while exit_far_index + 1 < len
&& tokenizer.events[exit_far_index + 1].token_type == Token::Data
{
exit_far_index += 2;
}
if exit_far_index > exit_index {
edit_map.add(exit_index, exit_far_index - exit_index, vec![]);
// Change positional info.
let exit_far = &tokenizer.events[exit_far_index];
let point_end = exit_far.point.clone();
let index_end = exit_far.index;
let exit = &mut tokenizer.events[exit_index];
exit.point = point_end;
exit.index = index_end;
index = exit_far_index;
continue;
}
}
index += 1;
}
edit_map.consume(tokenizer.events.split_off(0))
}
|
