feat: Swift language support

* feat: add Swift language support

Add tree-sitter-swift extractor for classes, structs, protocols,
functions, imports, and call graph edges. Includes 8 passing tests.

* feat: full Swift AST support — enums, extensions, actors, conformance

- Enums: extract enum types, methods, and cases (case_of edges)
- Extensions: methods attach to the original type (no duplicate nodes)
- Actors: recognized via unified class_declaration node type
- Conformance/inheritance: inherits edges from : Protocol syntax
- deinit/subscript: name resolution for nameless declarations
- 12 new tests (110 total, all passing)

graphify/extract.py

@@ -371,6 +371,24 @@ def _csharp_extra_walk(node, source: bytes, file_nid: str, stem: str, str_path:
     return False
 
 
+# ── Swift extra walk for enum cases ──────────────────────────────────────────
+
+def _swift_extra_walk(node, source: bytes, file_nid: str, stem: str, str_path: str,
+                      nodes: list, edges: list, seen_ids: set, function_bodies: list,
+                      parent_class_nid: str | None, add_node_fn, add_edge_fn) -> bool:
+    """Handle enum_entry for Swift. Returns True if handled."""
+    if node.type == "enum_entry" and parent_class_nid:
+        for child in node.children:
+            if child.type == "simple_identifier":
+                case_name = _read_text(child, source)
+                case_nid = _make_id(parent_class_nid, case_name)
+                line = node.start_point[0] + 1
+                add_node_fn(case_nid, case_name, line)
+                add_edge_fn(parent_class_nid, case_nid, "case_of", line)
+        return True
+    return False
+
+
 # ── Language configs ──────────────────────────────────────────────────────────
 
 _PYTHON_CONFIG = LanguageConfig(
@@ -527,6 +545,39 @@ _PHP_CONFIG = LanguageConfig(
 )
 
 
+def _import_swift(node, source: bytes, file_nid: str, stem: str, edges: list, str_path: str) -> None:
+    for child in node.children:
+        if child.type == "identifier":
+            raw = _read_text(child, source)
+            tgt_nid = _make_id(raw)
+            edges.append({
+                "source": file_nid,
+                "target": tgt_nid,
+                "relation": "imports",
+                "confidence": "EXTRACTED",
+                "source_file": str_path,
+                "source_location": f"L{node.start_point[0] + 1}",
+                "weight": 1.0,
+            })
+            break
+
+
+_SWIFT_CONFIG = LanguageConfig(
+    ts_module="tree_sitter_swift",
+    class_types=frozenset({"class_declaration", "protocol_declaration"}),
+    function_types=frozenset({"function_declaration", "init_declaration", "deinit_declaration", "subscript_declaration"}),
+    import_types=frozenset({"import_declaration"}),
+    call_types=frozenset({"call_expression"}),
+    call_function_field="",
+    call_accessor_node_types=frozenset({"navigation_expression"}),
+    call_accessor_field="",
+    name_fallback_child_types=("simple_identifier", "type_identifier", "user_type"),
+    body_fallback_child_types=("class_body", "protocol_body", "function_body", "enum_class_body"),
+    function_boundary_types=frozenset({"function_declaration", "init_declaration", "deinit_declaration", "subscript_declaration"}),
+    import_handler=_import_swift,
+)
+
+
 # ── Generic extractor ─────────────────────────────────────────────────────────
 
 def _extract_generic(path: Path, config: LanguageConfig) -> dict:
@@ -634,6 +685,27 @@ def _extract_generic(path: Path, config: LanguageConfig) -> dict:
                                     seen_ids.add(base_nid)
                             add_edge(class_nid, base_nid, "inherits", line)
 
+            # Swift-specific: conformance / inheritance
+            if config.ts_module == "tree_sitter_swift":
+                for child in node.children:
+                    if child.type == "inheritance_specifier":
+                        for sub in child.children:
+                            if sub.type in ("user_type", "type_identifier"):
+                                base = _read_text(sub, source)
+                                base_nid = _make_id(stem, base)
+                                if base_nid not in seen_ids:
+                                    base_nid = _make_id(base)
+                                    if base_nid not in seen_ids:
+                                        nodes.append({
+                                            "id": base_nid,
+                                            "label": base,
+                                            "file_type": "code",
+                                            "source_file": "",
+                                            "source_location": "",
+                                        })
+                                        seen_ids.add(base_nid)
+                                add_edge(class_nid, base_nid, "inherits", line)
+
             # Find body and recurse
             body = _find_body(node, config)
             if body:
@@ -643,11 +715,15 @@ def _extract_generic(path: Path, config: LanguageConfig) -> dict:
 
         # Function types
         if t in config.function_types:
-            # Resolve function name
+            # Swift deinit/subscript have no name field — resolve before generic fallback
-            if config.resolve_function_name_fn is not None:
+            if t == "deinit_declaration":
+                func_name: str | None = "deinit"
+            elif t == "subscript_declaration":
+                func_name = "subscript"
+            elif config.resolve_function_name_fn is not None:
                 # C/C++ style: use declarator
                 declarator = node.child_by_field_name("declarator")
-                func_name: str | None = None
+                func_name = None
                 if declarator:
                     func_name = config.resolve_function_name_fn(declarator, source)
             else:
@@ -690,6 +766,12 @@ def _extract_generic(path: Path, config: LanguageConfig) -> dict:
                                    parent_class_nid, add_node, add_edge, walk):
                 return
 
+        if config.ts_module == "tree_sitter_swift":
+            if _swift_extra_walk(node, source, file_nid, stem, str_path,
+                                  nodes, edges, seen_ids, function_bodies,
+                                  parent_class_nid, add_node, add_edge):
+                return
+
         # Default: recurse
         for child in node.children:
             walk(child, parent_class_nid=None)
@@ -713,7 +795,19 @@ def _extract_generic(path: Path, config: LanguageConfig) -> dict:
             callee_name: str | None = None
 
             # Special handling per language
-            if config.ts_module == "tree_sitter_kotlin":
+            if config.ts_module == "tree_sitter_swift":
+                # Swift: first child may be simple_identifier or navigation_expression
+                first = node.children[0] if node.children else None
+                if first:
+                    if first.type == "simple_identifier":
+                        callee_name = _read_text(first, source)
+                    elif first.type == "navigation_expression":
+                        for child in first.children:
+                            if child.type == "navigation_suffix":
+                                for sc in child.children:
+                                    if sc.type == "simple_identifier":
+                                        callee_name = _read_text(sc, source)
+            elif config.ts_module == "tree_sitter_kotlin":
                 # Kotlin: first child may be simple_identifier or navigation_expression
                 first = node.children[0] if node.children else None
                 if first:
@@ -984,6 +1078,11 @@ def extract_php(path: Path) -> dict:
     return _extract_generic(path, _PHP_CONFIG)
 
 
+def extract_swift(path: Path) -> dict:
+    """Extract classes, structs, protocols, functions, imports, and calls from a .swift file."""
+    return _extract_generic(path, _SWIFT_CONFIG)
+
+
 # ── Go extractor (custom walk) ────────────────────────────────────────────────
 
 def extract_go(path: Path) -> dict:
@@ -1523,6 +1622,7 @@ def extract(paths: list[Path]) -> dict:
         ".kts": extract_kotlin,
         ".scala": extract_scala,
         ".php": extract_php,
+        ".swift": extract_swift,
     }
 
     for path in paths:
@@ -1564,7 +1664,7 @@ def collect_files(target: Path) -> list[Path]:
     _EXTENSIONS = (
         "*.py", "*.js", "*.ts", "*.tsx", "*.go", "*.rs",
         "*.java", "*.c", "*.h", "*.cpp", "*.cc", "*.cxx", "*.hpp",
-        "*.rb", "*.cs", "*.kt", "*.kts", "*.scala", "*.php",
+        "*.rb", "*.cs", "*.kt", "*.kts", "*.scala", "*.php", "*.swift",
     )
     results: list[Path] = []
     for pattern in _EXTENSIONS:

pyproject.toml

@@ -26,6 +26,7 @@ dependencies = [
     "tree-sitter-kotlin",
     "tree-sitter-scala",
     "tree-sitter-php",
+    "tree-sitter-swift",
 ]
 
 [project.urls]

tests/fixtures/sample.swift

@@ -0,0 +1,73 @@
+import Foundation
+import UIKit
+
+protocol Processor {
+    func process() -> [String]
+}
+
+protocol Loggable {
+    func log()
+}
+
+class DataProcessor: Processor {
+    private var items: [String] = []
+
+    init() {}
+
+    deinit {}
+
+    func addItem(_ item: String) {
+        items.append(item)
+    }
+
+    func process() -> [String] {
+        return validate(items)
+    }
+
+    private func validate(_ data: [String]) -> [String] {
+        return data.filter { !$0.isEmpty }
+    }
+}
+
+struct Config {
+    let baseUrl: String
+    let timeout: Int
+
+    subscript(key: String) -> String? {
+        return nil
+    }
+}
+
+enum NetworkError {
+    case timeout
+    case connectionFailed
+    case unauthorized
+
+    func describe() -> String {
+        return "error"
+    }
+}
+
+actor CacheManager {
+    private var store: [String: String] = [:]
+
+    func get(_ key: String) -> String? {
+        return store[key]
+    }
+}
+
+extension DataProcessor: Loggable {
+    func log() {
+        print("logging")
+    }
+}
+
+extension Config {
+    func isValid() -> Bool {
+        return !baseUrl.isEmpty
+    }
+}
+
+func createProcessor() -> DataProcessor {
+    return DataProcessor()
+}

tests/test_extract.py

@@ -60,7 +60,8 @@ def test_collect_files_from_dir():
     files = collect_files(FIXTURES)
     supported = {".py", ".js", ".ts", ".tsx", ".go", ".rs",
                  ".java", ".c", ".cpp", ".cc", ".cxx", ".rb",
-                 ".cs", ".kt", ".kts", ".scala", ".php", ".h", ".hpp"}
+                 ".cs", ".kt", ".kts", ".scala", ".php", ".h", ".hpp",
+                 ".swift"}
     assert all(f.suffix in supported for f in files)
     assert len(files) > 0
 

tests/test_languages.py

@@ -1,10 +1,11 @@
-"""Tests for the 8 new language extractors: Java, C, C++, Ruby, C#, Kotlin, Scala, PHP."""
+"""Tests for language extractors: Java, C, C++, Ruby, C#, Kotlin, Scala, PHP, Swift."""
 from __future__ import annotations
 from pathlib import Path
 import pytest
 from graphify.extract import (
     extract_java, extract_c, extract_cpp, extract_ruby,
     extract_csharp, extract_kotlin, extract_scala, extract_php,
+    extract_swift,
 )
 
 FIXTURES = Path(__file__).parent / "fixtures"
@@ -217,3 +218,122 @@ def test_php_finds_function():
 def test_php_finds_imports():
     r = extract_php(FIXTURES / "sample.php")
     assert "imports" in _relations(r)
+
+
+# ── Swift ────────────────────────────────────────────────────────────────────
+
+def test_swift_no_error():
+    r = extract_swift(FIXTURES / "sample.swift")
+    assert "error" not in r
+
+def test_swift_finds_class():
+    r = extract_swift(FIXTURES / "sample.swift")
+    assert any("DataProcessor" in l for l in _labels(r))
+
+def test_swift_finds_protocol():
+    r = extract_swift(FIXTURES / "sample.swift")
+    assert any("Processor" in l for l in _labels(r))
+
+def test_swift_finds_struct():
+    r = extract_swift(FIXTURES / "sample.swift")
+    assert any("Config" in l for l in _labels(r))
+
+def test_swift_finds_methods():
+    r = extract_swift(FIXTURES / "sample.swift")
+    labels = _labels(r)
+    assert any("addItem" in l for l in labels)
+    assert any("process" in l for l in labels)
+
+def test_swift_finds_function():
+    r = extract_swift(FIXTURES / "sample.swift")
+    assert any("createProcessor" in l for l in _labels(r))
+
+def test_swift_finds_imports():
+    r = extract_swift(FIXTURES / "sample.swift")
+    assert "imports" in _relations(r)
+
+def test_swift_no_dangling_edges():
+    r = extract_swift(FIXTURES / "sample.swift")
+    node_ids = {n["id"] for n in r["nodes"]}
+    for e in r["edges"]:
+        assert e["source"] in node_ids
+
+def test_swift_finds_actor():
+    r = extract_swift(FIXTURES / "sample.swift")
+    assert any("CacheManager" in l for l in _labels(r))
+
+def test_swift_finds_enum():
+    r = extract_swift(FIXTURES / "sample.swift")
+    assert any("NetworkError" in l for l in _labels(r))
+
+def test_swift_finds_enum_methods():
+    r = extract_swift(FIXTURES / "sample.swift")
+    assert any("describe" in l for l in _labels(r))
+
+def test_swift_finds_enum_cases():
+    r = extract_swift(FIXTURES / "sample.swift")
+    labels = _labels(r)
+    assert any("timeout" in l for l in labels)
+    assert any("connectionFailed" in l for l in labels)
+
+def test_swift_enum_cases_have_case_of_edge():
+    r = extract_swift(FIXTURES / "sample.swift")
+    case_edges = [e for e in r["edges"] if e["relation"] == "case_of"]
+    assert len(case_edges) >= 2
+
+def test_swift_finds_deinit():
+    r = extract_swift(FIXTURES / "sample.swift")
+    assert any("deinit" in l for l in _labels(r))
+
+def test_swift_finds_subscript():
+    r = extract_swift(FIXTURES / "sample.swift")
+    assert any("subscript" in l for l in _labels(r))
+
+def test_swift_extension_methods_attach_to_type():
+    r = extract_swift(FIXTURES / "sample.swift")
+    node_by_id = {n["id"]: n["label"] for n in r["nodes"]}
+    method_edges = [e for e in r["edges"] if e["relation"] == "method"]
+    found = False
+    for e in method_edges:
+        src_label = node_by_id.get(e["source"], "")
+        tgt_label = node_by_id.get(e["target"], "")
+        if "Config" in src_label and "isValid" in tgt_label:
+            found = True
+            break
+    assert found, "extension method isValid should attach to Config"
+
+def test_swift_extension_does_not_duplicate_type_node():
+    r = extract_swift(FIXTURES / "sample.swift")
+    config_nodes = [n for n in r["nodes"] if n["label"] == "Config"]
+    assert len(config_nodes) == 1, f"Config should appear once, got {len(config_nodes)}"
+
+def test_swift_conformance_edge():
+    r = extract_swift(FIXTURES / "sample.swift")
+    inherits_edges = [e for e in r["edges"] if e["relation"] == "inherits"]
+    node_by_id = {n["id"]: n["label"] for n in r["nodes"]}
+    found = False
+    for e in inherits_edges:
+        src_label = node_by_id.get(e["source"], "")
+        tgt_label = node_by_id.get(e["target"], "")
+        if "DataProcessor" in src_label and "Processor" in tgt_label:
+            found = True
+            break
+    assert found, "DataProcessor should have inherits edge to Processor"
+
+def test_swift_extension_conformance_edge():
+    r = extract_swift(FIXTURES / "sample.swift")
+    inherits_edges = [e for e in r["edges"] if e["relation"] == "inherits"]
+    node_by_id = {n["id"]: n["label"] for n in r["nodes"]}
+    found = False
+    for e in inherits_edges:
+        src_label = node_by_id.get(e["source"], "")
+        tgt_label = node_by_id.get(e["target"], "")
+        if "DataProcessor" in src_label and "Loggable" in tgt_label:
+            found = True
+            break
+    assert found, "extension should add conformance edge DataProcessor -> Loggable"
+
+def test_swift_emits_calls():
+    r = extract_swift(FIXTURES / "sample.swift")
+    calls = _calls(r)
+    assert any("process" in src and "validate" in tgt for src, tgt in calls)