Implement conditional returns

Author: AJenbo

src/completion/resolver.rs

@@ -130,7 +130,8 @@ impl Backend {
     /// `paren_end` is the position one past the closing `)`.
     ///
     /// Returns subjects such as:
-    ///   - `"app()"` for a standalone function call
+    ///   - `"app()"` for a standalone function call without arguments
+    ///   - `"app(A::class)"` for a function call with arguments (preserved)
     ///   - `"$this->getService()"` for an instance method call
     ///   - `"ClassName::make()"` for a static method call
     ///   - `"ClassName"` for `new ClassName()` instantiation
@@ -140,6 +141,11 @@ impl Backend {
             return None;
         }
 
+        // Capture the argument text between the parentheses for later use
+        // in conditional return-type resolution (e.g. `app(A::class)`).
+        let args_text: String = chars[open + 1..paren_end - 1].iter().collect();
+        let args_text = args_text.trim();
+
         // Read the function / method name before `(`
         let mut i = open;
         while i > 0
@@ -187,8 +193,13 @@ impl Backend {
             }
         }
 
-        // Standalone function call: `app()`
-        Some(format!("{}()", func_name))
+        // Standalone function call: preserve arguments for conditional
+        // return-type resolution (e.g. `app(A::class)` instead of `app()`).
+        if args_text.is_empty() {
+            Some(format!("{}()", func_name))
+        } else {
+            Some(format!("{}({})", func_name, args_text))
+        }
     }
 
     /// Raw helper: extract identifier/keyword before `::` without going

src/completion/target.rs

@@ -532,7 +532,8 @@ impl Backend {
     /// `paren_end` is the position one past the closing `)`.
     ///
     /// Returns subjects such as:
-    ///   - `"app()"` for a standalone function call
+    ///   - `"app()"` for a standalone function call without arguments
+    ///   - `"app(A::class)"` for a function call with arguments (preserved)
     ///   - `"$this->getService()"` for an instance method call
     ///   - `"ClassName::make()"` for a static method call
     ///   - `"ClassName"` for `new ClassName()` instantiation
@@ -542,6 +543,11 @@ impl Backend {
             return None;
         }
 
+        // Capture the argument text between the parentheses for later use
+        // in conditional return-type resolution (e.g. `app(A::class)`).
+        let args_text: String = chars[open + 1..paren_end - 1].iter().collect();
+        let args_text = args_text.trim();
+
         // Read the function / method name before `(`
         let mut i = open;
         while i > 0
@@ -586,8 +592,13 @@ impl Backend {
             }
         }
 
-        // Standalone function call: `app()`
-        Some(format!("{}()", func_name))
+        // Standalone function call: preserve arguments for conditional
+        // return-type resolution (e.g. `app(A::class)` instead of `app()`).
+        if args_text.is_empty() {
+            Some(format!("{}()", func_name))
+        } else {
+            Some(format!("{}({})", func_name, args_text))
+        }
     }
 
     /// Extract a `$variable` ending at position `end` (exclusive).