add map for pseudo elements

src/class.rs

@@ -28,12 +28,13 @@ impl<'a> Class<'a> {
 
         if let Some(pseudo) = pseudo {
             rest.push_str("::");
+            let pseudo: &str = z.pseudos.get(*pseudo).map(AsRef::as_ref).unwrap_or(pseudo);
             rest.push_str(pseudo);
         }
 
         // TODO we can probably skip the format here, we just need to push the char at the start
         if !rest.is_empty() {
-            rest = format!(":{rest}");
+            rest.insert(0, ':')
         }
 
         format!(".{original}{rest}")

src/defaults.rs

@@ -58,3 +58,13 @@ pub(crate) fn default_modifiers() -> HashMap<String, String> {
     .map(|(a, b)| (a.to_string(), b.to_string()))
     .collect()
 }
+
+pub(crate) fn default_pseudos() -> HashMap<String, String> {
+    vec![
+        ("ph", "placeholder"),
+        // TODO
+    ]
+    .into_iter()
+    .map(|(a, b)| (a.to_string(), b.to_string()))
+    .collect()
+}

src/lib.rs

@@ -15,6 +15,7 @@ pub struct Zephyr {
     pub names: HashMap<String, String>,
     pub values: HashMap<String, String>,
     pub modifiers: HashMap<String, String>,
+    pub pseudos: HashMap<String, String>,
 }
 
 impl Zephyr {
@@ -25,6 +26,7 @@ impl Zephyr {
             names: default_names(),
             values: default_values(),
             modifiers: default_modifiers(),
+            pseudos: default_pseudos(),
         }
     }
 
@@ -35,6 +37,7 @@ impl Zephyr {
             names: HashMap::new(),
             values: HashMap::new(),
             modifiers: HashMap::new(),
+            pseudos: HashMap::new(),
         }
     }