Fix missing blackboard bold letters (#3759)

crates/typst/src/math/style.rs

@@ -300,7 +300,8 @@ pub fn styled_char(styles: StyleChain, c: char, auto_italic: bool) -> char {
                 c,
                 'a'..='z' | 'ı' | 'ȷ' | 'A'..='Z' | 'α'..='ω' |
                 '∂' | 'ϵ' | 'ϑ' | 'ϰ' | 'ϕ' | 'ϱ' | 'ϖ'
-            ),
+            )
+            && matches!(variant, Sans | Serif),
     );
 
     if let Some(c) = basic_exception(c) {
@@ -444,6 +445,11 @@ fn latin_exception(
         ('Q', Bb, ..) => 'ℚ',
         ('R', Bb, ..) => 'ℝ',
         ('Z', Bb, ..) => 'ℤ',
+        ('D', Bb, _, true) => 'ⅅ',
+        ('d', Bb, _, true) => 'ⅆ',
+        ('e', Bb, _, true) => 'ⅇ',
+        ('i', Bb, _, true) => 'ⅈ',
+        ('j', Bb, _, true) => 'ⅉ',
         ('h', Serif, false, true) => 'ℎ',
         ('e', Cal, false, _) => 'ℯ',
         ('g', Cal, false, _) => 'ℊ',
@@ -462,15 +468,20 @@ fn greek_exception(
 ) -> Option<char> {
     use MathVariant::*;
     let list = match c {
-        'ϴ' => ['𝚹', '𝛳', '𝜭', '𝝧', '𝞡'],
-        '∇' => ['𝛁', '𝛻', '𝜵', '𝝯', '𝞩'],
-        '∂' => ['𝛛', '𝜕', '𝝏', '𝞉', '𝟃'],
-        'ϵ' => ['𝛜', '𝜖', '𝝐', '𝞊', '𝟄'],
-        'ϑ' => ['𝛝', '𝜗', '𝝑', '𝞋', '𝟅'],
-        'ϰ' => ['𝛞', '𝜘', '𝝒', '𝞌', '𝟆'],
-        'ϕ' => ['𝛟', '𝜙', '𝝓', '𝞍', '𝟇'],
-        'ϱ' => ['𝛠', '𝜚', '𝝔', '𝞎', '𝟈'],
-        'ϖ' => ['𝛡', '𝜛', '𝝕', '𝞏', '𝟉'],
+        'ϴ' => ['𝚹', '𝛳', '𝜭', '𝝧', '𝞡', 'ϴ'],
+        '∇' => ['𝛁', '𝛻', '𝜵', '𝝯', '𝞩', '∇'],
+        '∂' => ['𝛛', '𝜕', '𝝏', '𝞉', '𝟃', '∂'],
+        'ϵ' => ['𝛜', '𝜖', '𝝐', '𝞊', '𝟄', 'ϵ'],
+        'ϑ' => ['𝛝', '𝜗', '𝝑', '𝞋', '𝟅', 'ϑ'],
+        'ϰ' => ['𝛞', '𝜘', '𝝒', '𝞌', '𝟆', 'ϰ'],
+        'ϕ' => ['𝛟', '𝜙', '𝝓', '𝞍', '𝟇', 'ϕ'],
+        'ϱ' => ['𝛠', '𝜚', '𝝔', '𝞎', '𝟈', 'ϱ'],
+        'ϖ' => ['𝛡', '𝜛', '𝝕', '𝞏', '𝟉', 'ϖ'],
+        'Γ' => ['𝚪', '𝛤', '𝜞', '𝝘', '𝞒', 'ℾ'],
+        'γ' => ['𝛄', '𝛾', '𝜸', '𝝲', '𝞬', 'ℽ'],
+        'Π' => ['𝚷', '𝛱', '𝜫', '𝝥', '𝞟', 'ℿ'],
+        'π' => ['𝛑', '𝜋', '𝝅', '𝝿', '𝞹', 'ℼ'],
+        '∑' => ['∑', '∑', '∑', '∑', '∑', '⅀'],
         _ => return None,
     };
 
@@ -480,6 +491,7 @@ fn greek_exception(
         (Serif, true, true) => list[2],
         (Sans, _, false) => list[3],
         (Sans, _, true) => list[4],
+        (Bb, ..) => list[5],
         _ => return None,
     })
 }

tests/typ/math/style.typ

@@ -20,7 +20,14 @@ $a/b, display(a/b), display(a)/display(b), inline(a/b), script(a/b), sscript(a/b
 
 ---
 // Test a few style exceptions.
-$h, bb(N), cal(R), Theta, italic(Theta), sans(Theta), sans(italic(Theta))$
+$h, bb(N), cal(R), Theta, italic(Theta), sans(Theta), sans(italic(Theta)) \
+ bb(d), bb(italic(d)), italic(bb(d)), bb(e), bb(italic(e)), italic(bb(e)) \
+ bb(i), bb(italic(i)), italic(bb(i)), bb(j), bb(italic(j)), italic(bb(j)) \
+ bb(D), bb(italic(D)), italic(bb(D))$
+
+---
+// Test a few greek exceptions.
+$bb(Gamma) , bb(gamma), bb(Pi), bb(pi), bb(sum)$
 
 ---
 // Test hebrew exceptions.