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|
//! MDX ESM 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_esm ::= word *line *(eol *line)
//!
//! word ::= 'e' 'x' 'p' 'o' 'r' 't' | 'i' 'm' 'p' 'o' 'r' 't'
//! ```
//!
//! This construct must be followed by a blank line or eof (end of file).
//! It can include blank lines if [`MdxEsmParse`][crate::MdxEsmParse] passed in
//! `options.mdx_esm_parse` allows it.
//!
//! ## Tokens
//!
//! * [`LineEnding`][Name::LineEnding]
//! * [`MdxEsm`][Name::MdxEsm]
//! * [`MdxEsmData`][Name::MdxEsmData]
//!
//! ## References
//!
//! * [`syntax.js` in `micromark-extension-mdxjs-esm`](https://github.com/micromark/micromark-extension-mdxjs-esm/blob/main/dev/lib/syntax.js)
//! * [`mdxjs.com`](https://mdxjs.com)
//!
//! [flow]: crate::construct::flow
use crate::event::Name;
use crate::state::{Name as StateName, State};
use crate::tokenizer::Tokenizer;
use crate::util::{
mdx_collect::{collect, place_to_point},
slice::Slice,
};
use crate::MdxSignal;
use alloc::format;
/// Start of MDX ESM.
///
/// ```markdown
/// > | import a from 'b'
/// ^
/// ```
pub fn start(tokenizer: &mut Tokenizer) -> State {
// If it’s turned on.
if tokenizer.parse_state.options.constructs.mdx_esm
// If there is a gnostic parser.
&& tokenizer.parse_state.options.mdx_esm_parse.is_some()
// When not interrupting.
&& !tokenizer.interrupt
// Only at the start of a line, not at whitespace or in a container.
&& tokenizer.point.column == 1
&& matches!(tokenizer.current, Some(b'e' | b'i'))
{
// Place where keyword starts.
tokenizer.tokenize_state.start = tokenizer.point.index;
tokenizer.enter(Name::MdxEsm);
tokenizer.enter(Name::MdxEsmData);
tokenizer.consume();
State::Next(StateName::MdxEsmWord)
} else {
State::Nok
}
}
/// In keyword.
///
/// ```markdown
/// > | import a from 'b'
/// ^^^^^^
/// ```
pub fn word(tokenizer: &mut Tokenizer) -> State {
if matches!(tokenizer.current, Some(b'a'..=b'z')) {
tokenizer.consume();
State::Next(StateName::MdxEsmWord)
} else {
let slice = Slice::from_indices(
tokenizer.parse_state.bytes,
tokenizer.tokenize_state.start,
tokenizer.point.index,
);
if matches!(slice.as_str(), "export" | "import") && tokenizer.current == Some(b' ') {
tokenizer.concrete = true;
tokenizer.tokenize_state.start = tokenizer.events.len() - 1;
tokenizer.consume();
State::Next(StateName::MdxEsmInside)
} else {
tokenizer.tokenize_state.start = 0;
State::Nok
}
}
}
/// In data.
///
/// ```markdown
/// > | import a from 'b'
/// ^
/// ```
pub fn inside(tokenizer: &mut Tokenizer) -> State {
match tokenizer.current {
None | Some(b'\n') => {
tokenizer.exit(Name::MdxEsmData);
State::Retry(StateName::MdxEsmLineStart)
}
_ => {
tokenizer.consume();
State::Next(StateName::MdxEsmInside)
}
}
}
/// At start of line.
///
/// ```markdown
/// | import a from 'b'
/// > | export {a}
/// ^
/// ```
pub fn line_start(tokenizer: &mut Tokenizer) -> State {
match tokenizer.current {
None => State::Retry(StateName::MdxEsmAtEnd),
Some(b'\n') => {
tokenizer.check(
State::Next(StateName::MdxEsmAtEnd),
State::Next(StateName::MdxEsmContinuationStart),
);
State::Retry(StateName::MdxEsmBlankLineBefore)
}
_ => {
tokenizer.enter(Name::MdxEsmData);
tokenizer.consume();
State::Next(StateName::MdxEsmInside)
}
}
}
/// At start of line that continues.
///
/// ```markdown
/// | import a from 'b'
/// > | export {a}
/// ^
/// ```
pub fn continuation_start(tokenizer: &mut Tokenizer) -> State {
tokenizer.enter(Name::LineEnding);
tokenizer.consume();
tokenizer.exit(Name::LineEnding);
State::Next(StateName::MdxEsmLineStart)
}
/// At start of a potentially blank line.
///
/// ```markdown
/// | import a from 'b'
/// > | export {a}
/// ^
/// ```
pub fn blank_line_before(tokenizer: &mut Tokenizer) -> State {
tokenizer.enter(Name::LineEnding);
tokenizer.consume();
tokenizer.exit(Name::LineEnding);
State::Next(StateName::BlankLineStart)
}
/// At end of line (blank or eof).
///
/// ```markdown
/// > | import a from 'b'
/// ^
/// ```
pub fn at_end(tokenizer: &mut Tokenizer) -> State {
let result = parse_esm(tokenizer);
// Done!.
if matches!(result, State::Ok) {
tokenizer.concrete = false;
tokenizer.exit(Name::MdxEsm);
}
result
}
/// Parse ESM with a given function.
fn parse_esm(tokenizer: &mut Tokenizer) -> State {
// We can `unwrap` because we don’t parse if this is `None`.
let parse = tokenizer
.parse_state
.options
.mdx_esm_parse
.as_ref()
.unwrap();
// Collect the body of the ESM and positional info for each run of it.
let result = collect(
tokenizer,
tokenizer.tokenize_state.start,
&[Name::MdxEsmData, Name::LineEnding],
);
// Parse and handle what was signaled back.
match parse(&result.value) {
MdxSignal::Ok => State::Ok,
MdxSignal::Error(message, place) => {
let point = place_to_point(&result, place);
State::Error(format!("{}:{}: {}", point.line, point.column, message))
}
MdxSignal::Eof(message) => {
if tokenizer.current == None {
State::Error(format!(
"{}:{}: {}",
tokenizer.point.line, tokenizer.point.column, message
))
} else {
tokenizer.tokenize_state.mdx_last_parse_error = Some(message);
State::Retry(StateName::MdxEsmContinuationStart)
}
}
}
}
|
