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|
//! MDX expression (flow) occurs in the [flow][] content type.
//!
//! ## Grammar
//!
//! MDX expression (flow) forms with the following BNF
//! (<small>see [construct][crate::construct] for character groups</small>):
//!
//! ```bnf
//! mdx_expression_flow ::= mdx_expression *space_or_tab
//!
//! ; See the `partial_mdx_expression` construct for the BNF of that part.
//! ```
//!
//! As this construct occurs in flow, like all flow constructs, it must be
//! followed by an eol (line ending) or eof (end of file).
//!
//! See [`mdx_expression`][mdx_expression] for more info.
//!
//! ## Tokens
//!
//! * [`MdxFlowExpression`][Name::MdxFlowExpression]
//! * [`SpaceOrTab`][Name::SpaceOrTab]
//! * see [`mdx_expression`][mdx_expression] for more
//!
//! ## Recommendation
//!
//! See [`mdx_expression`][mdx_expression] for recommendations.
//!
//! ## References
//!
//! * [`syntax.js` in `micromark-extension-mdx-expression`](https://github.com/micromark/micromark-extension-mdx-expression/blob/main/packages/micromark-extension-mdx-expression/dev/lib/syntax.js)
//! * [`mdxjs.com`](https://mdxjs.com)
//!
//! [flow]: crate::construct::flow
//! [mdx_expression]: crate::construct::partial_mdx_expression
use crate::construct::partial_space_or_tab::{space_or_tab, space_or_tab_min_max};
use crate::event::Name;
use crate::state::{Name as StateName, State};
use crate::tokenizer::Tokenizer;
use crate::util::constant::TAB_SIZE;
/// Start of an MDX expression (flow).
///
/// ```markdown
/// > | {Math.PI}
/// ^
/// ```
pub fn start(tokenizer: &mut Tokenizer) -> State {
if tokenizer.parse_state.options.constructs.mdx_expression_flow {
tokenizer.tokenize_state.token_1 = Name::MdxFlowExpression;
tokenizer.concrete = true;
if matches!(tokenizer.current, Some(b'\t' | b' ')) {
tokenizer.attempt(State::Next(StateName::MdxExpressionFlowBefore), State::Nok);
State::Retry(space_or_tab_min_max(
tokenizer,
0,
if tokenizer.parse_state.options.constructs.code_indented {
TAB_SIZE - 1
} else {
usize::MAX
},
))
} else {
State::Retry(StateName::MdxExpressionFlowBefore)
}
} else {
State::Nok
}
}
/// After optional whitespace, before expression.
///
/// ```markdown
/// > | {Math.PI}
/// ^
/// ```
pub fn before(tokenizer: &mut Tokenizer) -> State {
if Some(b'{') == tokenizer.current {
tokenizer.attempt(State::Next(StateName::MdxExpressionFlowAfter), State::Nok);
State::Retry(StateName::MdxExpressionStart)
} else {
State::Nok
}
}
/// After expression.
///
/// ```markdown
/// > | {Math.PI}
/// ^
/// ```
pub fn after(tokenizer: &mut Tokenizer) -> State {
match tokenizer.current {
Some(b'\t' | b' ') => {
tokenizer.attempt(State::Next(StateName::MdxExpressionFlowEnd), State::Nok);
State::Retry(space_or_tab(tokenizer))
}
_ => State::Retry(StateName::MdxExpressionFlowEnd),
}
}
/// After expression, after optional whitespace.
///
/// ```markdown
/// > | {Math.PI}␠␊
/// ^
/// ```
pub fn end(tokenizer: &mut Tokenizer) -> State {
tokenizer.concrete = false;
tokenizer.tokenize_state.token_1 = Name::Data;
if matches!(tokenizer.current, None | Some(b'\n')) {
State::Ok
} else {
State::Nok
}
}
|
