Pass text node to text show rule instead of string

library/src/text/mod.rs

@@ -167,6 +167,13 @@ impl TextNode {
             }
         }
     }
+
+    fn field(&self, name: &str) -> Option<Value> {
+        match name {
+            "text" => Some(Value::Str(self.0.clone().into())),
+            _ => None,
+        }
+    }
 }
 
 impl Debug for TextNode {

src/model/styles.rs

@@ -419,9 +419,10 @@ impl Recipe {
                         result.push(make(text[cursor..start].into()));
                     }
 
-                    let transformed = self
-                        .transform
-                        .apply(world, self.span, || Value::Str(mat.as_str().into()))?;
+                    let transformed = self.transform.apply(world, self.span, || {
+                        Value::Content(make(mat.as_str().into()))
+                    })?;
+
                     result.push(transformed);
                     cursor = mat.end();
                 }

tests/typ/style/show-text.typ

@@ -47,6 +47,11 @@ Treeworld, the World of worlds, is a world.
 #show regex("(?i)rust"): it => [#it (🚀)]
 Rust is memory-safe and blazingly fast. Let's rewrite everything in rust.
 
+---
+// Test accessing the string itself.
+#show "hello": it => it.text.split("").map(upper).join("|")
+Oh, hello there!
+
 ---
 // Replace worlds but only in lists.
 #show list: it => [