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Add support for styling U+2126 OHM SIGN #183

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Add support for styling U+2126 OHM SIGN #183

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9f981bb
Add support for styling U+2126 OHM SIGN
MDLC01 Aug 26, 2026
637dca0
Add test
MDLC01 Aug 26, 2026
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32 changes: 31 additions & 1 deletion src/styling.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -433,7 +433,9 @@ mod conversions {

#[inline]
pub fn is_upper_greek(c: char) -> bool {
matches!(c, 'Α'..='Ω' | '∇' | 'ϴ')
// The last character is U+2126 OHM SIGN, which canonically
// decomposes to the regular capital Omega (U+03A9).
matches!(c, 'Α'..='Ω' | '∇' | 'ϴ' | 'Ω')
}

#[inline]
Expand Down Expand Up @@ -463,6 +465,7 @@ mod conversions {
'ϴ' => 0x1D2C5,
'Σ'..='Ω' => 0x1D317,
'∇' => 0x1B4BA,
'Ω' => 0x1B59A,
'α'..='ω' => 0x1D311,
// Additional bold Greek symbols (U+1D6DB..U+1D6E1)
'∂' => 0x1B4D9,
Expand Down Expand Up @@ -500,6 +503,7 @@ mod conversions {
'ϴ' => 0x1D2FF,
'Σ'..='Ω' => 0x1D351,
'∇' => 0x1B4F4,
'Ω' => 0x1B5D4,
'α'..='ω' => 0x1D34B,
// Additional italic Greek symbols (U+1D715..U+1D71B)
'∂' => 0x1B513,
Expand All @@ -525,6 +529,7 @@ mod conversions {
'ϴ' => 0x1D339,
'Σ'..='Ω' => 0x1D38B,
'∇' => 0x1B52E,
'Ω' => 0x1B60E,
'α'..='ω' => 0x1D385,
// Additional bold italic Greek symbols (U+1D74F..U+1D755)
'∂' => 0x1B54D,
Expand Down Expand Up @@ -628,6 +633,7 @@ mod conversions {
'ϴ' => 0x1D373,
'Σ'..='Ω' => 0x1D3C5,
'∇' => 0x1B568,
'Ω' => 0x1B648,
'α'..='ω' => 0x1D3BF,
// Additional sans-serif bold Greek symbols (U+1D789..U+1D78F)
'∂' => 0x1B587,
Expand Down Expand Up @@ -666,6 +672,7 @@ mod conversions {
'ϴ' => 0x1D3AD,
'Σ'..='Ω' => 0x1D3FF,
'∇' => 0x1B5A2,
'Ω' => 0x1B682,
'α'..='ω' => 0x1D3F9,
// Additional sans-serif bold italic Greek symbols (U+1D7C3..U+1D7C9)
'∂' => 0x1B5C1,
Expand Down Expand Up @@ -940,3 +947,26 @@ mod conversions {
apply_delta(c, delta)
}
}

#[cfg(test)]
mod test {
use super::*;

/// U+2126 OHM SIGN canonically decomposes to U+03A9 GREEK CAPITAL LETTER
/// OMEGA and should therefore be styled the same way.
#[test]
fn ohm_sign_styles_like_capital_omega() {
const OHM: char = '\u{2126}';
const OMEGA: char = '\u{03A9}';

for f in [
conversions::to_bold,
conversions::to_italic,
conversions::to_bold_italic,
conversions::to_sans_serif_bold,
conversions::to_sans_serif_bold_italic,
] {
assert_eq!(f(OHM), f(OMEGA))
}
}
}
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