Add Kotlin language support

api/analyzers/analyzer.py

@@ -56,7 +56,7 @@ def resolve(self, files: dict[Path, File], lsp: SyncLanguageServer, file_path: P
         try:
             locations = lsp.request_definition(str(file_path), node.start_point.row, node.start_point.column)
             return [(files[Path(self.resolve_path(location['absolutePath'], path))], files[Path(self.resolve_path(location['absolutePath'], path))].tree.root_node.descendant_for_point_range(Point(location['range']['start']['line'], location['range']['start']['character']), Point(location['range']['end']['line'], location['range']['end']['character']))) for location in locations if location and Path(self.resolve_path(location['absolutePath'], path)) in files]
-        except Exception as e:
+        except Exception:
             return []
 
     @abstractmethod
@@ -135,7 +135,7 @@ def add_symbols(self, entity: Entity) -> None:
     @abstractmethod
     def resolve_symbol(self, files: dict[Path, File], lsp: SyncLanguageServer, file_path: Path, path: Path, key: str, symbol: Node) -> list[Entity]:
         """
-        Resolve a symbol to an entity.
+        Resolve a symbol to entities.
 
         Args:
             lsp (SyncLanguageServer): The language server.

api/analyzers/kotlin/analyzer.py

@@ -0,0 +1,157 @@
+from pathlib import Path
+from ...entities.entity import Entity
+from ...entities.file import File
+from typing import Optional
+from ..analyzer import AbstractAnalyzer
+
+from multilspy import SyncLanguageServer
+
+import tree_sitter_kotlin as tskotlin
+from tree_sitter import Language, Node
+
+import logging
+logger = logging.getLogger('code_graph')
+
+class KotlinAnalyzer(AbstractAnalyzer):
+    def __init__(self) -> None:
+        super().__init__(Language(tskotlin.language()))
+
+    def add_dependencies(self, path: Path, files: list[Path]):
+        # For now, we skip dependency resolution for Kotlin
+        # In the future, this could parse build.gradle or pom.xml for Kotlin projects
+        pass
+
+    def get_entity_label(self, node: Node) -> str:
+        if node.type == 'class_declaration':
+            # Check if it's an interface by looking for interface keyword
+            for child in node.children:
+                if child.type == 'interface':
+                    return "Interface"
+            return "Class"
+        elif node.type == 'object_declaration':
+            return "Object"
+        elif node.type == 'function_declaration':
+            # Check if this is a method (inside a class) or a top-level function
+            parent = node.parent
+            if parent and parent.type == 'class_body':
+                return "Method"
+            return "Function"
+        raise ValueError(f"Unknown entity type: {node.type}")
+
+    def get_entity_name(self, node: Node) -> str:
+        if node.type in ['class_declaration', 'object_declaration', 'function_declaration']:
+            for child in node.children:
+                if child.type == 'identifier':
+                    return child.text.decode('utf-8')
+        raise ValueError(f"Cannot extract name from entity type: {node.type}")
+
+    def get_entity_docstring(self, node: Node) -> Optional[str]:
+        if node.type in ['class_declaration', 'object_declaration', 'function_declaration']:
+            # Check for KDoc comment (/** ... */) before the node
+            if node.prev_sibling and node.prev_sibling.type == "multiline_comment":
+                comment_text = node.prev_sibling.text.decode('utf-8')
+                # Only return if it's a KDoc comment (starts with /**)
+                if comment_text.startswith('/**'):
+                    return comment_text
+            return None
+        raise ValueError(f"Unknown entity type: {node.type}")        
+
+    def get_entity_types(self) -> list[str]:
+        return ['class_declaration', 'object_declaration', 'function_declaration']
+
+    def _get_delegation_types(self, entity: Entity) -> list[tuple]:
+        """Extract type identifiers from delegation specifiers in order.
+
+        Returns list of (node, is_constructor_invocation) tuples.
+        constructor_invocation indicates a superclass; plain user_type indicates an interface.
+        """
+        types = []
+        for child in entity.node.children:
+            if child.type == 'delegation_specifiers':
+                for spec in child.children:
+                    if spec.type == 'delegation_specifier':
+                        for sub in spec.children:
+                            if sub.type == 'constructor_invocation':
+                                for s in sub.children:
+                                    if s.type == 'user_type':
+                                        for id_node in s.children:
+                                            if id_node.type == 'identifier':
+                                                types.append((id_node, True))
+                            elif sub.type == 'user_type':
+                                for id_node in sub.children:
+                                    if id_node.type == 'identifier':
+                                        types.append((id_node, False))
+        return types
+
+    def add_symbols(self, entity: Entity) -> None:
+        if entity.node.type == 'class_declaration':
+            types = self._get_delegation_types(entity)
+            for node, is_class in types:
+                if is_class:
+                    entity.add_symbol("base_class", node)
+                else:
+                    entity.add_symbol("implement_interface", node)
+
+        elif entity.node.type == 'object_declaration':
+            types = self._get_delegation_types(entity)
+            for node, _ in types:
+                entity.add_symbol("implement_interface", node)
+
+        elif entity.node.type == 'function_declaration':
+            # Find function calls
+            captures = self._captures("(call_expression) @reference.call", entity.node)
+            if 'reference.call' in captures:
+                for caller in captures['reference.call']:
+                    entity.add_symbol("call", caller)
+
+            # Find parameters with types
+            captures = self._captures("(parameter (user_type (identifier) @parameter))", entity.node)
+            if 'parameter' in captures:
+                for parameter in captures['parameter']:
+                    entity.add_symbol("parameters", parameter)
+
+            # Find return type
+            captures = self._captures("(function_declaration (user_type (identifier) @return_type))", entity.node)
+            if 'return_type' in captures:
+                for return_type in captures['return_type']:
+                    entity.add_symbol("return_type", return_type)
+
+    def is_dependency(self, file_path: str) -> bool:
+        # Check if file is in a dependency directory (e.g., build, .gradle cache)
+        return "build/" in file_path or ".gradle/" in file_path or "/cache/" in file_path
+
+    def resolve_path(self, file_path: str, path: Path) -> str:
+        # For Kotlin, just return the file path as-is for now
+        return file_path
+
+    def resolve_type(self, files: dict[Path, File], lsp: SyncLanguageServer, file_path: Path, path: Path, node: Node) -> list[Entity]:
+        res = []
+        for file, resolved_node in self.resolve(files, lsp, file_path, path, node):
+            type_dec = self.find_parent(resolved_node, ['class_declaration', 'object_declaration'])
+            if type_dec in file.entities:
+                res.append(file.entities[type_dec])
+        return res
+
+    def resolve_method(self, files: dict[Path, File], lsp: SyncLanguageServer, file_path: Path, path: Path, node: Node) -> list[Entity]:
+        res = []
+        # For call expressions, we need to extract the function name
+        if node.type == 'call_expression':
+            # Find the identifier being called
+            for child in node.children:
+                if child.type in ['identifier', 'navigation_expression']:
+                    for file, resolved_node in self.resolve(files, lsp, file_path, path, child):
+                        method_dec = self.find_parent(resolved_node, ['function_declaration', 'class_declaration', 'object_declaration'])
+                        if method_dec and method_dec.type in ['class_declaration', 'object_declaration']:
+                            continue
+                        if method_dec in file.entities:
+                            res.append(file.entities[method_dec])
+                    break
+        return res
+
+    def resolve_symbol(self, files: dict[Path, File], lsp: SyncLanguageServer, file_path: Path, path: Path, key: str, symbol: Node) -> list[Entity]:
+        if key in ["implement_interface", "base_class", "parameters", "return_type"]:
+            return self.resolve_type(files, lsp, file_path, path, symbol)
+        elif key in ["call"]:
+            return self.resolve_method(files, lsp, file_path, path, symbol)
+        else:
+            raise ValueError(f"Unknown key {key}")

api/analyzers/source_analyzer.py

@@ -8,10 +8,11 @@
 from ..graph import Graph
 from .analyzer import AbstractAnalyzer
 # from .c.analyzer import CAnalyzer
-from .java.analyzer import JavaAnalyzer
-from .python.analyzer import PythonAnalyzer
 from .csharp.analyzer import CSharpAnalyzer
+from .java.analyzer import JavaAnalyzer
 from .javascript.analyzer import JavaScriptAnalyzer
+from .kotlin.analyzer import KotlinAnalyzer
+from .python.analyzer import PythonAnalyzer
 
 from multilspy import SyncLanguageServer
 from multilspy.multilspy_config import MultilspyConfig
@@ -28,7 +29,9 @@
     '.py': PythonAnalyzer(),
     '.java': JavaAnalyzer(),
     '.cs': CSharpAnalyzer(),
-    '.js': JavaScriptAnalyzer()}
+    '.js': JavaScriptAnalyzer(),
+    '.kt': KotlinAnalyzer(),
+    '.kts': KotlinAnalyzer()}
 
 class NullLanguageServer:
     def start_server(self):
@@ -145,8 +148,11 @@ def second_pass(self, graph: Graph, files: list[Path], path: Path) -> None:
             lsps[".cs"] = SyncLanguageServer.create(config, logger, str(path))
         else:
             lsps[".cs"] = NullLanguageServer()
+        # For now, use NullLanguageServer for Kotlin as kotlin-language-server setup is not yet integrated
+        lsps[".kt"] = NullLanguageServer()
+        lsps[".kts"] = NullLanguageServer()
         lsps[".js"] = NullLanguageServer()
-        with lsps[".java"].start_server(), lsps[".py"].start_server(), lsps[".cs"].start_server(), lsps[".js"].start_server():
+        with lsps[".java"].start_server(), lsps[".py"].start_server(), lsps[".cs"].start_server(), lsps[".js"].start_server(), lsps[".kt"].start_server(), lsps[".kts"].start_server():
             files_len = len(self.files)
             for i, file_path in enumerate(files):
                 if file_path not in self.files:
@@ -158,31 +164,28 @@ def second_pass(self, graph: Graph, files: list[Path], path: Path) -> None:
                 logging.info(f'Processing file ({i + 1}/{files_len}): {file_path}')
                 for _, entity in file.entities.items():
                     entity.resolved_symbol(lambda key, symbol, fp=file_path: analyzers[fp.suffix].resolve_symbol(self.files, lsps[fp.suffix], fp, path, key, symbol))
-                    for key, symbols in entity.symbols.items():
-                        for symbol in symbols:
-                            if len(symbol.resolved_symbol) == 0:
-                                continue
-                            resolved_symbol = next(iter(symbol.resolved_symbol))
+                    for key, resolved_set in entity.resolved_symbols.items():
+                        for resolved in resolved_set:
                             if key == "base_class":
-                                graph.connect_entities("EXTENDS", entity.id, resolved_symbol.id)
+                                graph.connect_entities("EXTENDS", entity.id, resolved.id)
                             elif key == "implement_interface":
-                                graph.connect_entities("IMPLEMENTS", entity.id, resolved_symbol.id)
+                                graph.connect_entities("IMPLEMENTS", entity.id, resolved.id)
                             elif key == "extend_interface":
-                                graph.connect_entities("EXTENDS", entity.id, resolved_symbol.id)
+                                graph.connect_entities("EXTENDS", entity.id, resolved.id)
                             elif key == "call":
-                                graph.connect_entities("CALLS", entity.id, resolved_symbol.id, {"line": symbol.symbol.start_point.row, "text": symbol.symbol.text.decode("utf-8")})
+                                graph.connect_entities("CALLS", entity.id, resolved.id)
                             elif key == "return_type":
-                                graph.connect_entities("RETURNS", entity.id, resolved_symbol.id)
+                                graph.connect_entities("RETURNS", entity.id, resolved.id)
                             elif key == "parameters":
-                                graph.connect_entities("PARAMETERS", entity.id, resolved_symbol.id)
+                                graph.connect_entities("PARAMETERS", entity.id, resolved.id)
 
     def analyze_files(self, files: list[Path], path: Path, graph: Graph) -> None:
         self.first_pass(path, files, [], graph)
         self.second_pass(graph, files, path)
 
     def analyze_sources(self, path: Path, ignore: list[str], graph: Graph) -> None:
         path = path.resolve()
-        files = list(path.rglob("*.java")) + list(path.rglob("*.py")) + list(path.rglob("*.cs")) + [f for f in path.rglob("*.js") if "node_modules" not in f.parts]
+        files = list(path.rglob("*.java")) + list(path.rglob("*.py")) + list(path.rglob("*.cs")) + [f for f in path.rglob("*.js") if "node_modules" not in f.parts] + list(path.rglob("*.kt")) + list(path.rglob("*.kts"))
         # First pass analysis of the source code
         self.first_pass(path, files, ignore, graph)
 

api/entities/entity.py

@@ -1,31 +1,31 @@
 from typing import Callable, Self
 from tree_sitter import Node
 
-class Symbol:
-    def __init__(self, symbol: Node):
-        self.symbol = symbol
-        self.resolved_symbol = set()
-
-    def add_resolve_symbol(self, resolved_symbol):
-        self.resolved_symbol.add(resolved_symbol)
 
 class Entity:
     def __init__(self, node: Node):
         self.node = node
-        self.symbols: dict[str, list[Symbol]] = {}
+        self.symbols: dict[str, list[Node]] = {}
+        self.resolved_symbols: dict[str, set[Self]] = {}
         self.children: dict[Node, Self] = {}
 
     def add_symbol(self, key: str, symbol: Node):
         if key not in self.symbols:
             self.symbols[key] = []
-        self.symbols[key].append(Symbol(symbol))
+        self.symbols[key].append(symbol)
+
+    def add_resolved_symbol(self, key: str, symbol: Self):
+        if key not in self.resolved_symbols:
+            self.resolved_symbols[key] = set()
+        self.resolved_symbols[key].add(symbol)
 
     def add_child(self, child: Self):
         child.parent = self
         self.children[child.node] = child
 
     def resolved_symbol(self, f: Callable[[str, Node], list[Self]]):
         for key, symbols in self.symbols.items():
+            self.resolved_symbols[key] = set()
             for symbol in symbols:
-                for resolved_symbol in f(key, symbol.symbol):
-                    symbol.add_resolve_symbol(resolved_symbol)
+                for resolved_symbol in f(key, symbol):
+                    self.resolved_symbols[key].add(resolved_symbol)

pyproject.toml

@@ -14,6 +14,7 @@ dependencies = [
     "tree-sitter-python>=0.25.0,<0.26.0",
     "tree-sitter-java>=0.23.5,<0.24.0",
     "tree-sitter-javascript>=0.23.0,<0.24.0",
+    "tree-sitter-kotlin>=1.1.0,<2.0.0",
     "tree-sitter-c-sharp>=0.23.1,<0.24.0",
     "fastapi>=0.115.0,<1.0.0",
     "uvicorn[standard]>=0.34.0,<1.0.0",

tests/source_files/kotlin/sample.kt

@@ -0,0 +1,39 @@
+/**
+ * A base interface for logging
+ */
+interface Logger {
+    fun log(message: String)
+}
+
+/**
+ * Base class for shapes
+ */
+open class Shape(val name: String) {
+    open fun area(): Double = 0.0
+}
+
+class Circle(val radius: Double) : Shape("circle"), Logger {
+    override fun area(): Double {
+        return Math.PI * radius * radius
+    }
+
+    override fun log(message: String) {
+        println(message)
+    }
+}
+
+fun calculateTotal(shapes: List<Shape>): Double {
+    var total = 0.0
+    for (shape in shapes) {
+        total += shape.area()
+    }
+    return total
+}
+
+object AppConfig : Logger {
+    val version = "1.0"
+
+    override fun log(message: String) {
+        println("[$version] $message")
+    }
+}