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//! Several helpers to parse whitespace (`space_or_tab`, `space_or_tab_eol`).
//!
//! ## References
//!
//! * [`micromark-factory-space/index.js` in `micromark`](https://github.com/micromark/micromark/blob/main/packages/micromark-factory-space/dev/index.js)
use crate::construct::partial_space_or_tab::{
space_or_tab_with_options, Options as SpaceOrTabOptions,
};
use crate::event::{Content, Name};
use crate::state::{Name as StateName, State};
use crate::subtokenize::link;
use crate::tokenizer::Tokenizer;
/// Options to parse `space_or_tab` and one optional eol, but no blank line.
#[derive(Debug)]
pub struct Options {
/// Connect this whitespace to the previous.
pub connect: bool,
/// Embedded content type to use.
pub content_type: Option<Content>,
}
/// `space_or_tab`, or optionally `space_or_tab`, one `eol`, and
/// optionally `space_or_tab`.
///
/// ```bnf
/// space_or_tab_eol ::= 1*( ' ' '\t' ) | 0*( ' ' '\t' ) eol 0*( ' ' '\t' )
/// ```
pub fn space_or_tab_eol(tokenizer: &mut Tokenizer) -> StateName {
space_or_tab_eol_with_options(
tokenizer,
Options {
content_type: 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_type = options.content_type;
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 {
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_type: tokenizer
.tokenize_state
.space_or_tab_eol_content_type
.clone(),
connect: tokenizer.tokenize_state.space_or_tab_eol_connect,
},
))
}
/// 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;
if tokenizer
.tokenize_state
.space_or_tab_eol_content_type
.is_some()
{
tokenizer.tokenize_state.space_or_tab_eol_connect = true;
}
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 {
tokenizer.enter_with_content(
Name::LineEnding,
tokenizer
.tokenize_state
.space_or_tab_eol_content_type
.clone(),
);
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_type
.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_type = 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 {
tokenizer.attempt(
State::Next(StateName::SpaceOrTabEolAfterMore),
State::Next(StateName::SpaceOrTabEolAfterMore),
);
State::Retry(space_or_tab_with_options(
tokenizer,
SpaceOrTabOptions {
kind: Name::SpaceOrTab,
min: 1,
max: usize::MAX,
content_type: tokenizer
.tokenize_state
.space_or_tab_eol_content_type
.clone(),
connect: tokenizer.tokenize_state.space_or_tab_eol_connect,
},
))
}
/// After optional final whitespace.
///
/// ```markdown
/// | a␠␠␊
/// > | ␠␠b
/// ^
/// | a␊
/// > | ␠␠b
/// ^
/// ```
pub fn after_more(tokenizer: &mut Tokenizer) -> State {
tokenizer.tokenize_state.space_or_tab_eol_content_type = None;
tokenizer.tokenize_state.space_or_tab_eol_connect = false;
tokenizer.tokenize_state.space_or_tab_eol_ok = false;
// Blank line not allowed.
if matches!(tokenizer.current, None | Some(b'\n')) {
State::Nok
} else {
State::Ok
}
}
|
