feat(native): port Objective-C extractor to Rust

crates/codegraph-core/Cargo.toml

@@ -36,6 +36,7 @@ tree-sitter-dart = "0.0.4"
 tree-sitter-zig = "1"
 tree-sitter-haskell = "0.23"
 tree-sitter-ocaml = "0.24"
+tree-sitter-objc = "3"
 tree-sitter-gleam = "1"
 tree-sitter-julia = "0.23"
 tree-sitter-clojure-orchard = "0.2"

crates/codegraph-core/src/extractors/helpers.rs

@@ -374,6 +374,19 @@ pub const OCAML_AST_CONFIG: LangAstConfig = LangAstConfig {
     string_prefixes: &[],
 };
 
+/// Objective-C string literals use the `@"..."` prefix. The shared
+/// `build_string_node` strips a leading `@` before applying prefixes, so we
+/// don't need to list it explicitly here.
+pub const OBJC_AST_CONFIG: LangAstConfig = LangAstConfig {
+    new_types: &[],
+    throw_types: &["throw_statement"],
+    await_types: &[],
+    string_types: &["string_literal"],
+    regex_types: &[],
+    quote_chars: &['"'],
+    string_prefixes: &[],
+};
+
 pub const GLEAM_AST_CONFIG: LangAstConfig = LangAstConfig {
     new_types: &[],
     throw_types: &[],

crates/codegraph-core/src/extractors/mod.rs

@@ -18,6 +18,7 @@ pub mod javascript;
 pub mod julia;
 pub mod kotlin;
 pub mod lua;
+pub mod objc;
 pub mod ocaml;
 pub mod php;
 pub mod python;
@@ -137,6 +138,9 @@ pub fn extract_symbols_with_opts(
         LanguageKind::Ocaml | LanguageKind::OcamlInterface => {
             ocaml::OcamlExtractor.extract_with_opts(tree, source, file_path, include_ast_nodes)
         }
+        LanguageKind::ObjC => {
+            objc::ObjCExtractor.extract_with_opts(tree, source, file_path, include_ast_nodes)
+        }
         LanguageKind::Gleam => {
             gleam::GleamExtractor.extract_with_opts(tree, source, file_path, include_ast_nodes)
         }