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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::event::{Content, Link, Name};
use crate::state::{Name as StateName, State};
use crate::subtokenize::link;
use crate::tokenizer::Tokenizer;
/// Options to parse `space_or_tab`.
#[derive(Debug)]
pub struct Options {
/// Minimum allowed bytes (inclusive).
pub min: usize,
/// Maximum allowed bytes (inclusive).
pub max: usize,
/// Token type to use for whitespace events.
pub kind: Name,
/// Connect this whitespace to the previous.
pub connect: bool,
/// Embedded content type to use.
pub content: Option<Content>,
}
/// One or more `space_or_tab`.
///
/// ```bnf
/// space_or_tab ::= 1*( ' ' '\t' )
/// ```
pub fn space_or_tab(tokenizer: &mut Tokenizer) -> StateName {
space_or_tab_min_max(tokenizer, 1, usize::MAX)
}
/// Between `x` and `y` `space_or_tab`.
///
/// ```bnf
/// space_or_tab_min_max ::= x*y( ' ' '\t' )
/// ```
pub fn space_or_tab_min_max(tokenizer: &mut Tokenizer, min: usize, max: usize) -> StateName {
space_or_tab_with_options(
tokenizer,
Options {
kind: Name::SpaceOrTab,
min,
max,
content: None,
connect: false,
},
)
}
/// `space_or_tab`, with the given options.
pub fn space_or_tab_with_options(tokenizer: &mut Tokenizer, options: Options) -> StateName {
tokenizer.tokenize_state.space_or_tab_connect = options.connect;
tokenizer.tokenize_state.space_or_tab_content = options.content;
tokenizer.tokenize_state.space_or_tab_min = options.min;
tokenizer.tokenize_state.space_or_tab_max = options.max;
tokenizer.tokenize_state.space_or_tab_token = options.kind;
StateName::SpaceOrTabStart
}
/// Start of `space_or_tab`.
///
/// ```markdown
/// > | a␠␠b
/// ^
/// ```
pub fn start(tokenizer: &mut Tokenizer) -> State {
if tokenizer.tokenize_state.space_or_tab_max > 0
&& matches!(tokenizer.current, Some(b'\t' | b' '))
{
if let Some(ref content) = tokenizer.tokenize_state.space_or_tab_content {
tokenizer.enter_link(
tokenizer.tokenize_state.space_or_tab_token.clone(),
Link {
previous: None,
next: None,
content: content.clone(),
},
);
} else {
tokenizer.enter(tokenizer.tokenize_state.space_or_tab_token.clone());
}
if tokenizer.tokenize_state.space_or_tab_connect {
let index = tokenizer.events.len() - 1;
link(&mut tokenizer.events, index);
} else if tokenizer.tokenize_state.space_or_tab_content.is_some() {
tokenizer.tokenize_state.space_or_tab_connect = true;
}
State::Retry(StateName::SpaceOrTabInside)
} else {
State::Retry(StateName::SpaceOrTabAfter)
}
}
/// In `space_or_tab`.
///
/// ```markdown
/// > | a␠␠b
/// ^
/// ```
pub fn inside(tokenizer: &mut Tokenizer) -> State {
match tokenizer.current {
Some(b'\t' | b' ')
if tokenizer.tokenize_state.space_or_tab_size
< tokenizer.tokenize_state.space_or_tab_max =>
{
tokenizer.consume();
tokenizer.tokenize_state.space_or_tab_size += 1;
State::Next(StateName::SpaceOrTabInside)
}
_ => {
tokenizer.exit(tokenizer.tokenize_state.space_or_tab_token.clone());
State::Retry(StateName::SpaceOrTabAfter)
}
}
}
/// After `space_or_tab`.
///
/// ```markdown
/// > | a␠␠b
/// ^
/// ```
pub fn after(tokenizer: &mut Tokenizer) -> State {
let state = if tokenizer.tokenize_state.space_or_tab_size
>= tokenizer.tokenize_state.space_or_tab_min
{
State::Ok
} else {
State::Nok
};
tokenizer.tokenize_state.space_or_tab_connect = false;
tokenizer.tokenize_state.space_or_tab_content = None;
tokenizer.tokenize_state.space_or_tab_size = 0;
tokenizer.tokenize_state.space_or_tab_max = 0;
tokenizer.tokenize_state.space_or_tab_min = 0;
tokenizer.tokenize_state.space_or_tab_token = Name::SpaceOrTab;
state
}
|
