Improve symbol repr (#5505)

crates/typst-library/src/foundations/symbol.rs

@@ -246,10 +246,50 @@ impl Debug for List {
 
 impl crate::foundations::Repr for Symbol {
     fn repr(&self) -> EcoString {
-        eco_format!("\"{}\"", self.get())
+        match &self.0 {
+            Repr::Single(c) => eco_format!("symbol(\"{}\")", *c),
+            Repr::Complex(variants) => {
+                eco_format!("symbol{}", repr_variants(variants.iter().copied(), ""))
+            }
+            Repr::Modified(arc) => {
+                let (list, modifiers) = arc.as_ref();
+                if modifiers.is_empty() {
+                    eco_format!("symbol{}", repr_variants(list.variants(), ""))
+                } else {
+                    eco_format!("symbol{}", repr_variants(list.variants(), modifiers))
+                }
+            }
+        }
     }
 }
 
+fn repr_variants<'a>(
+    variants: impl Iterator<Item = (&'a str, char)>,
+    applied_modifiers: &str,
+) -> String {
+    crate::foundations::repr::pretty_array_like(
+        &variants
+            .filter(|(variant, _)| {
+                // Only keep variants that can still be accessed, i.e., variants
+                // that contain all applied modifiers.
+                parts(applied_modifiers).all(|am| variant.split('.').any(|m| m == am))
+            })
+            .map(|(variant, c)| {
+                let trimmed_variant = variant
+                    .split('.')
+                    .filter(|&m| parts(applied_modifiers).all(|am| m != am));
+                if trimmed_variant.clone().all(|m| m.is_empty()) {
+                    eco_format!("\"{c}\"")
+                } else {
+                    let trimmed_modifiers = trimmed_variant.collect::<Vec<_>>().join(".");
+                    eco_format!("(\"{}\", \"{}\")", trimmed_modifiers, c)
+                }
+            })
+            .collect::<Vec<_>>(),
+        false,
+    )
+}
+
 impl Serialize for Symbol {
     fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
     where

tests/suite/symbols/symbol.typ

@@ -49,3 +49,65 @@
 --- symbol-unknown-modifier ---
 // Error: 13-20 unknown symbol modifier
 #emoji.face.garbage
+
+--- symbol-repr ---
+#test(
+  repr(sym.amp),
+  `symbol("&", ("inv", "⅋"))`.text,
+)
+#test(
+  repr(sym.amp.inv),
+  `symbol("⅋")`.text,
+)
+#test(
+  repr(sym.arrow.double.r),
+  ```
+  symbol(
+    "⇒",
+    ("bar", "⤇"),
+    ("long", "⟹"),
+    ("long.bar", "⟾"),
+    ("not", "⇏"),
+    ("l", "⇔"),
+    ("l.long", "⟺"),
+    ("l.not", "⇎"),
+  )
+  ```.text,
+)
+#test(repr(sym.smash), "symbol(\"⨳\")")
+
+#let envelope = symbol(
+  "🖂",
+  ("stamped", "🖃"),
+  ("stamped.pen", "🖆"),
+  ("lightning", "🖄"),
+  ("fly", "🖅"),
+)
+#test(
+  repr(envelope),
+  ```
+  symbol(
+    "🖂",
+    ("stamped", "🖃"),
+    ("stamped.pen", "🖆"),
+    ("lightning", "🖄"),
+    ("fly", "🖅"),
+  )
+  ```.text,
+)
+#test(
+  repr(envelope.stamped),
+  `symbol("🖃", ("pen", "🖆"))`.text,
+)
+#test(
+  repr(envelope.stamped.pen),
+  `symbol("🖆")`.text,
+)
+#test(
+  repr(envelope.lightning),
+  `symbol("🖄")`.text,
+)
+#test(
+  repr(envelope.fly),
+  `symbol("🖅")`.text,
+)