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|
//! Space or tab (eol) occurs in [destination][], [label][], and [title][].
//!
//! ## Grammar
//!
//! Space or tab (eol) forms with the following BNF
//! (<small>see [construct][crate::construct] for character groups</small>):
//!
//! ```bnf
//! space_or_tab_eol ::= 1*space_or_tab | *space_or_tab eol *space_or_tab
//! ```
//!
//! Importantly, this allows one line ending, but not blank lines.
//!
//! ## References
//!
//! * [`micromark-factory-space/index.js` in `micromark`](https://github.com/micromark/micromark/blob/main/packages/micromark-factory-space/dev/index.js)
//!
//! [destination]: crate::construct::partial_destination
//! [label]: crate::construct::partial_label
//! [title]: crate::construct::partial_title
use crate::construct::partial_space_or_tab::{
space_or_tab_with_options, Options as SpaceOrTabOptions,
};
use crate::event::{Content, Link, Name};
use crate::state::{Name as StateName, State};
use crate::subtokenize::link;
use crate::tokenizer::Tokenizer;
/// Configuration.
#[derive(Debug)]
pub struct Options {
/// Connect this whitespace to the previous.
pub connect: bool,
/// Embedded content type to use.
pub content: Option<Content>,
}
/// `space_or_tab_eol`
pub fn space_or_tab_eol(tokenizer: &mut Tokenizer) -> StateName {
space_or_tab_eol_with_options(
tokenizer,
Options {
content: None,
connect: false,
},
)
}
/// `space_or_tab_eol`, with the given options.
pub fn space_or_tab_eol_with_options(tokenizer: &mut Tokenizer, options: Options) -> StateName {
tokenizer.tokenize_state.space_or_tab_eol_content = options.content;
tokenizer.tokenize_state.space_or_tab_eol_connect = options.connect;
StateName::SpaceOrTabEolStart
}
/// Start of whitespace with at most one eol.
///
/// ```markdown
/// > | a␠␠b
/// ^
/// > | a␠␠␊
/// ^
/// | ␠␠b
/// ```
pub fn start(tokenizer: &mut Tokenizer) -> State {
match tokenizer.current {
Some(b'\t' | b' ') => {
tokenizer.attempt(
State::Next(StateName::SpaceOrTabEolAfterFirst),
State::Next(StateName::SpaceOrTabEolAtEol),
);
State::Retry(space_or_tab_with_options(
tokenizer,
SpaceOrTabOptions {
kind: Name::SpaceOrTab,
min: 1,
max: usize::MAX,
content: tokenizer.tokenize_state.space_or_tab_eol_content.clone(),
connect: tokenizer.tokenize_state.space_or_tab_eol_connect,
},
))
}
_ => State::Retry(StateName::SpaceOrTabEolAtEol),
}
}
/// After initial whitespace, at optional eol.
///
/// ```markdown
/// > | a␠␠b
/// ^
/// > | a␠␠␊
/// ^
/// | ␠␠b
/// ```
pub fn after_first(tokenizer: &mut Tokenizer) -> State {
tokenizer.tokenize_state.space_or_tab_eol_ok = true;
debug_assert!(
tokenizer.tokenize_state.space_or_tab_eol_content.is_none(),
"expected no content"
);
// If the above ever errors, set `tokenizer.tokenize_state.space_or_tab_eol_connect: true` in that case.
State::Retry(StateName::SpaceOrTabEolAtEol)
}
/// After optional whitespace, at eol.
///
/// ```markdown
/// > | a␠␠b
/// ^
/// > | a␠␠␊
/// ^
/// | ␠␠b
/// > | a␊
/// ^
/// | ␠␠b
/// ```
pub fn at_eol(tokenizer: &mut Tokenizer) -> State {
if let Some(b'\n') = tokenizer.current {
if let Some(ref content) = tokenizer.tokenize_state.space_or_tab_eol_content {
tokenizer.enter_link(
Name::LineEnding,
Link {
previous: None,
next: None,
content: content.clone(),
},
);
} else {
tokenizer.enter(Name::LineEnding);
}
if tokenizer.tokenize_state.space_or_tab_eol_connect {
let index = tokenizer.events.len() - 1;
link(&mut tokenizer.events, index);
} else if tokenizer.tokenize_state.space_or_tab_eol_content.is_some() {
tokenizer.tokenize_state.space_or_tab_eol_connect = true;
}
tokenizer.consume();
tokenizer.exit(Name::LineEnding);
State::Next(StateName::SpaceOrTabEolAfterEol)
} else {
let ok = tokenizer.tokenize_state.space_or_tab_eol_ok;
tokenizer.tokenize_state.space_or_tab_eol_content = None;
tokenizer.tokenize_state.space_or_tab_eol_connect = false;
tokenizer.tokenize_state.space_or_tab_eol_ok = false;
if ok {
State::Ok
} else {
State::Nok
}
}
}
/// After eol.
///
/// ```markdown
/// | a␠␠␊
/// > | ␠␠b
/// ^
/// | a␊
/// > | ␠␠b
/// ^
/// ```
pub fn after_eol(tokenizer: &mut Tokenizer) -> State {
if matches!(tokenizer.current, Some(b'\t' | b' ')) {
tokenizer.attempt(State::Next(StateName::SpaceOrTabEolAfterMore), State::Nok);
State::Retry(space_or_tab_with_options(
tokenizer,
SpaceOrTabOptions {
kind: Name::SpaceOrTab,
min: 1,
max: usize::MAX,
content: tokenizer.tokenize_state.space_or_tab_eol_content.clone(),
connect: tokenizer.tokenize_state.space_or_tab_eol_connect,
},
))
} else {
State::Retry(StateName::SpaceOrTabEolAfterMore)
}
}
/// After optional final whitespace.
///
/// ```markdown
/// | a␠␠␊
/// > | ␠␠b
/// ^
/// | a␊
/// > | ␠␠b
/// ^
/// ```
pub fn after_more(tokenizer: &mut Tokenizer) -> State {
debug_assert!(
!matches!(tokenizer.current, None | Some(b'\n')),
"did not expect blank line"
);
// If the above ever starts erroring, gracefully `State::Nok` on it.
// Currently it doesn’t happen, as we only use this in content, which does
// not allow blank lines.
tokenizer.tokenize_state.space_or_tab_eol_content = None;
tokenizer.tokenize_state.space_or_tab_eol_connect = false;
tokenizer.tokenize_state.space_or_tab_eol_ok = false;
State::Ok
}
|
