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//! To do.
use crate::construct::partial_space_or_tab::space_or_tab_min_max;
use crate::event::Name;
use crate::state::{Name as StateName, State};
use crate::tokenizer::Tokenizer;
use alloc::format;
/// Start of MDX: expression.
///
/// ```markdown
/// > | a {Math.PI} c
/// ^
/// ```
pub fn start(tokenizer: &mut Tokenizer) -> State {
debug_assert_eq!(tokenizer.current, Some(b'{'));
tokenizer.enter(tokenizer.tokenize_state.token_1.clone());
tokenizer.enter(Name::MdxExpressionMarker);
tokenizer.consume();
tokenizer.exit(Name::MdxExpressionMarker);
State::Next(StateName::MdxExpressionBefore)
}
pub fn before(tokenizer: &mut Tokenizer) -> State {
match tokenizer.current {
None => {
State::Error(format!(
"{}:{}: Unexpected end of file in expression, expected a corresponding closing brace for `{{`",
tokenizer.point.line, tokenizer.point.column
))
}
Some(b'\n') => {
tokenizer.enter(Name::LineEnding);
tokenizer.consume();
tokenizer.exit(Name::LineEnding);
State::Next(StateName::MdxExpressionEolAfter)
},
Some(b'}') if tokenizer.tokenize_state.size == 0 => {
tokenizer.enter(Name::MdxExpressionMarker);
tokenizer.consume();
tokenizer.exit(Name::MdxExpressionMarker);
tokenizer.exit(tokenizer.tokenize_state.token_1.clone());
State::Ok
},
Some(_) => {
tokenizer.enter(Name::MdxExpressionData);
State::Retry(StateName::MdxExpressionInside)
}
}
}
pub fn inside(tokenizer: &mut Tokenizer) -> State {
if matches!(tokenizer.current, None | Some(b'\n'))
|| (tokenizer.current == Some(b'}') && tokenizer.tokenize_state.size == 0)
{
tokenizer.exit(Name::MdxExpressionData);
State::Retry(StateName::MdxExpressionBefore)
} else {
// To do: only count if agnostic.
if tokenizer.current == Some(b'{') {
tokenizer.tokenize_state.size += 1;
}
tokenizer.consume();
State::Next(StateName::MdxExpressionInside)
}
}
pub fn eol_after(tokenizer: &mut Tokenizer) -> State {
// Lazy continuation in a flow expression is a syntax error.
if tokenizer.tokenize_state.token_1 == Name::MdxFlowExpression && tokenizer.lazy {
State::Error(format!(
"{}:{}: Unexpected lazy line in expression in container, expected line to be prefixed with `>` when in a block quote, whitespace when in a list, etc",
tokenizer.point.line, tokenizer.point.column
))
} else if matches!(tokenizer.current, Some(b'\t' | b' ')) {
tokenizer.attempt(State::Next(StateName::MdxExpressionBefore), State::Nok);
// To do: use `start_column` + constants.tabSize for max space to eat.
State::Next(space_or_tab_min_max(tokenizer, 0, usize::MAX))
} else {
State::Retry(StateName::MdxExpressionBefore)
}
}
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