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|
//! Utilities to classify characters as whitespace, punctuation, or rest.
use crate::unicode::PUNCTUATION;
/// Character kinds.
#[derive(Debug, PartialEq, Eq)]
pub enum Kind {
/// Whitespace.
///
/// ## Example
///
/// ```markdown
/// > | **a_b_ c**.
/// ^ ^ ^
/// ```
Whitespace,
/// Punctuation.
///
/// ## Example
///
/// ```markdown
/// > | **a_b_ c**.
/// ^^ ^ ^ ^
/// ```
Punctuation,
/// Everything else.
///
/// ## Example
///
/// ```markdown
/// > | **a_b_ c**.
/// ^ ^ ^
/// ```
Other,
}
/// Classify whether a character code represents whitespace, punctuation, or
/// something else.
///
/// Used for attention (emphasis, strong), whose sequences can open or close
/// based on the class of surrounding characters.
///
/// > 👉 **Note** that eof (`None`) is seen as whitespace.
///
/// ## References
///
/// * [`micromark-util-classify-character` in `micromark`](https://github.com/micromark/micromark/blob/main/packages/micromark-util-classify-character/dev/index.js)
pub fn classify(char: char) -> Kind {
// Unicode whitespace.
if char.is_whitespace() {
Kind::Whitespace
}
// Unicode punctuation.
else if PUNCTUATION.contains(&char) {
Kind::Punctuation
}
// Everything else.
else {
Kind::Other
}
}
/// Like [`classify`], but supports eof as whitespace.
pub fn classify_opt(char_opt: Option<char>) -> Kind {
if let Some(char) = char_opt {
classify(char)
}
// EOF.
else {
Kind::Whitespace
}
}
|
