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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::subtokenize::link;
use crate::token::Token;
use crate::tokenizer::{ContentType, State, StateFn, 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: Token,
/// Connect this whitespace to the previous.
pub connect: bool,
/// Embedded content type to use.
pub content_type: Option<ContentType>,
}
/// Options to parse `space_or_tab` and one optional eol, but no blank line.
#[derive(Debug)]
pub struct EolOptions {
/// Connect this whitespace to the previous.
pub connect: bool,
/// Embedded content type to use.
pub content_type: Option<ContentType>,
}
/// State needed to parse `space_or_tab`.
#[derive(Debug)]
struct Info {
/// Current size.
size: usize,
/// Configuration.
options: Options,
}
/// State needed to parse `space_or_tab_eol`.
#[derive(Debug)]
struct EolInfo {
/// Whether to connect the next whitespace to the event before.
connect: bool,
/// Whether there was initial whitespace.
ok: bool,
/// Configuration.
options: EolOptions,
}
/// One or more `space_or_tab`.
///
/// ```bnf
/// space_or_tab ::= 1*( ' ' '\t' )
/// ```
pub fn space_or_tab() -> Box<StateFn> {
space_or_tab_min_max(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(min: usize, max: usize) -> Box<StateFn> {
space_or_tab_with_options(Options {
kind: Token::SpaceOrTab,
min,
max,
content_type: None,
connect: false,
})
}
/// `space_or_tab`, with the given options.
pub fn space_or_tab_with_options(options: Options) -> Box<StateFn> {
Box::new(|t| start(t, Info { size: 0, options }))
}
/// `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() -> Box<StateFn> {
space_or_tab_eol_with_options(EolOptions {
content_type: None,
connect: false,
})
}
/// `space_or_tab_eol`, with the given options.
pub fn space_or_tab_eol_with_options(options: EolOptions) -> Box<StateFn> {
Box::new(move |tokenizer| {
let mut info = EolInfo {
connect: options.connect,
ok: false,
options,
};
tokenizer.attempt(
space_or_tab_with_options(Options {
kind: Token::SpaceOrTab,
min: 1,
max: usize::MAX,
content_type: info.options.content_type.clone(),
connect: info.options.connect,
}),
move |ok| {
if ok {
info.ok = ok;
if info.options.content_type.is_some() {
info.connect = true;
}
}
Box::new(|t| after_space_or_tab(t, info))
},
)(tokenizer)
})
}
/// Before `space_or_tab`.
///
/// ```markdown
/// > | a␠␠b
/// ^
/// ```
fn start(tokenizer: &mut Tokenizer, mut info: Info) -> State {
match tokenizer.current {
Some(b'\t' | b' ') if info.options.max > 0 => {
tokenizer
.enter_with_content(info.options.kind.clone(), info.options.content_type.clone());
if info.options.content_type.is_some() {
let index = tokenizer.events.len() - 1;
link(&mut tokenizer.events, index);
}
tokenizer.consume();
info.size += 1;
State::Fn(Box::new(|t| inside(t, info)))
}
_ => {
if info.options.min == 0 {
State::Ok
} else {
State::Nok
}
}
}
}
/// In `space_or_tab`.
///
/// ```markdown
/// > | a␠␠b
/// ^
/// ```
fn inside(tokenizer: &mut Tokenizer, mut info: Info) -> State {
match tokenizer.current {
Some(b'\t' | b' ') if info.size < info.options.max => {
tokenizer.consume();
info.size += 1;
State::Fn(Box::new(|t| inside(t, info)))
}
_ => {
tokenizer.exit(info.options.kind.clone());
if info.size >= info.options.min {
State::Ok
} else {
State::Nok
}
}
}
}
/// `space_or_tab_eol`: after optionally first `space_or_tab`.
///
/// ```markdown
/// > | a
/// ^
/// | b
/// ```
fn after_space_or_tab(tokenizer: &mut Tokenizer, mut info: EolInfo) -> State {
match tokenizer.current {
Some(b'\n') => {
tokenizer.enter_with_content(Token::LineEnding, info.options.content_type.clone());
if info.connect {
let index = tokenizer.events.len() - 1;
link(&mut tokenizer.events, index);
} else if info.options.content_type.is_some() {
info.connect = true;
}
tokenizer.consume();
tokenizer.exit(Token::LineEnding);
State::Fn(Box::new(|t| after_eol(t, info)))
}
_ if info.ok => State::Ok,
_ => State::Nok,
}
}
/// `space_or_tab_eol`: after eol.
///
/// ```markdown
/// | a
/// > | b
/// ^
/// ```
#[allow(clippy::needless_pass_by_value)]
fn after_eol(tokenizer: &mut Tokenizer, info: EolInfo) -> State {
tokenizer.attempt_opt(
space_or_tab_with_options(Options {
kind: Token::SpaceOrTab,
min: 1,
max: usize::MAX,
content_type: info.options.content_type,
connect: info.connect,
}),
after_more_space_or_tab,
)(tokenizer)
}
/// `space_or_tab_eol`: after more (optional) `space_or_tab`.
///
/// ```markdown
/// | a
/// > | b
/// ^
/// ```
fn after_more_space_or_tab(tokenizer: &mut Tokenizer) -> State {
// Blank line not allowed.
if matches!(tokenizer.current, None | Some(b'\n')) {
State::Nok
} else {
State::Ok
}
}
|
