mirror of
https://github.com/typst/typst
synced 2025-05-14 17:15:28 +08:00
37 lines
1.3 KiB
Rust
37 lines
1.3 KiB
Rust
use super::*;
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pub(super) const ZERO: Em = Em::zero();
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pub(super) const THIN: Em = Em::new(1.0 / 6.0);
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pub(super) const MEDIUM: Em = Em::new(2.0 / 9.0);
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pub(super) const THICK: Em = Em::new(5.0 / 18.0);
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pub(super) const QUAD: Em = Em::new(1.0);
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/// Determine the spacing between two fragments in a given style.
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pub(super) fn spacing(left: MathClass, right: MathClass, style: MathStyle) -> Em {
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use MathClass::*;
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let script = style.size <= MathSize::Script;
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match (left, right) {
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// No spacing before punctuation; thin spacing after punctuation, unless
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// in script size.
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(_, Punctuation) => ZERO,
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(Punctuation, _) if !script => THIN,
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// No spacing after opening delimiters and before closing delimiters.
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(Opening, _) | (_, Closing) => ZERO,
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// Thick spacing around relations, unless followed by a another relation
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// or in script size.
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(Relation, Relation) => ZERO,
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(Relation, _) | (_, Relation) if !script => THICK,
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// Medium spacing around binary operators, unless in script size.
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(Vary | Binary, _) | (_, Vary | Binary) if !script => MEDIUM,
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// Thin spacing around large operators, unless next to a delimiter.
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(Large, Opening | Fence) | (Closing | Fence, Large) => ZERO,
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(Large, _) | (_, Large) => THIN,
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_ => ZERO,
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}
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}
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