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42 lines
1.5 KiB
Rust
42 lines
1.5 KiB
Rust
/// Determine whether a character is a line break.
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pub fn char_is_linebreak(c: char) -> bool {
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matches!(
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c,
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'\u{000A}' | // LineFeed
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'\u{000B}' | // VerticalTab
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'\u{000C}' | // FormFeed
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'\u{000D}' | // CarriageReturn
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'\u{0085}' | // NextLine
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'\u{2028}' | // Line Separator
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'\u{2029}' // ParagraphSeparator
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)
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}
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/// Determine whether a character qualifies as (non-line-break)
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/// whitespace.
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pub fn char_is_whitespace(c: char) -> bool {
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// TODO: this is a naive binary categorization of whitespace
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// characters. For display, word wrapping, etc. we'll need a better
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// categorization based on e.g. breaking vs non-breaking spaces
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// and whether they're zero-width or not.
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match c {
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//'\u{1680}' | // Ogham Space Mark (here for completeness, but usually displayed as a dash, not as whitespace)
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'\u{0009}' | // Character Tabulation
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'\u{0020}' | // Space
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'\u{00A0}' | // No-break Space
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'\u{180E}' | // Mongolian Vowel Separator
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'\u{202F}' | // Narrow No-break Space
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'\u{205F}' | // Medium Mathematical Space
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'\u{3000}' | // Ideographic Space
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'\u{FEFF}' // Zero Width No-break Space
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=> true,
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// En Quad, Em Quad, En Space, Em Space, Three-per-em Space,
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// Four-per-em Space, Six-per-em Space, Figure Space,
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// Punctuation Space, Thin Space, Hair Space, Zero Width Space.
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c if ('\u{2000}' ..= '\u{200B}').contains(&c) => true,
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_ => false,
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}
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}
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