Add MATLAB language server support (#893)

Requires Matlab and node to be installed, using vscode Matlab extension as LS

CHANGELOG.md

@@ -56,6 +56,7 @@ Status of the `main` branch. Changes prior to the next official version change w
   * **Add support for Erlang** experimental, may hang or be slow, uses the recently archived [erlang_ls](https://github.com/erlang-ls/erlang_ls)
   * **Ruby dual language server support**: Added ruby-lsp as the modern primary Ruby language server. Solargraph remains available as an experimental legacy option. ruby-lsp supports both .rb and .erb files, while Solargraph supports .rb files only.
   * **Add support for PowerShell** via PowerShell Editor Services (PSES). Requires `pwsh` (PowerShell Core) to be installed and available in PATH. Supports symbol navigation, go-to-definition, and within-file references for .ps1 files.
+  * **Add support for MATLAB** via the official MathWorks MATLAB Language Server. Requires MATLAB R2021b or later and Node.js. Set `MATLAB_PATH` environment variable or configure `matlab_path` in `ls_specific_settings`. Supports .m, .mlx, and .mlapp files with code completion, diagnostics, go-to-definition, find references, document symbols, formatting, and rename.
 
 
 # 0.1.4

README.md

@@ -82,7 +82,7 @@ that implement the language server protocol (LSP).
 The underlying language servers are typically open-source projects (like Serena) or at least freely available for use.
 
 With Serena's LSP library, we provide **support for over 30 programming languages**, including
-AL, Bash, C#, C/C++, Clojure, Dart, Elixir, Elm, Erlang, Fortran, Go, Groovy (partial support), Haskell, Java, Javascript, Julia, Kotlin, Lua, Markdown, Nix, Perl, PHP, PowerShell, Python, R, Ruby, Rust, Scala, Swift, TOML, TypeScript, YAML, and Zig.
+AL, Bash, C#, C/C++, Clojure, Dart, Elixir, Elm, Erlang, Fortran, Go, Groovy (partial support), Haskell, Java, Javascript, Julia, Kotlin, Lua, Markdown, MATLAB, Nix, Perl, PHP, PowerShell, Python, R, Ruby, Rust, Scala, Swift, TOML, TypeScript, YAML, and Zig.
 
 > [!IMPORTANT]
 > Some language servers require additional dependencies to be installed; see the [Language Support](https://oraios.github.io/serena/01-about/020_programming-languages.html) page for details.

pyproject.toml

@@ -306,6 +306,7 @@ markers = [
   "powershell: language server running for PowerShell",
   "slow: tests that require additional Expert instances and have long startup times (~60-90s each)",
   "toml: language server running for TOML",
+  "matlab: language server running for MATLAB (requires MATLAB R2021b+)",
 ]
 
 [tool.codespell]

src/solidlsp/language_servers/matlab_language_server.py

@@ -0,0 +1,559 @@
+"""
+MATLAB language server integration using the official MathWorks MATLAB Language Server.
+
+Architecture:
+    This module uses the MathWorks MATLAB VS Code extension (mathworks.language-matlab)
+    which contains a Node.js-based language server. The extension is downloaded from the
+    VS Code Marketplace and extracted locally. The language server spawns a real MATLAB
+    process to provide code intelligence - it is NOT a standalone static analyzer.
+
+    Flow: Serena -> Node.js LSP Server -> MATLAB Process -> Code Analysis
+
+Why MATLAB installation is required:
+    The language server launches an actual MATLAB session (via MatlabSession.js) to perform
+    code analysis, diagnostics, and other features. Without MATLAB, the LSP cannot function.
+    This is different from purely static analyzers that parse code without execution.
+
+Requirements:
+    - MATLAB R2021b or later must be installed and licensed
+    - Node.js must be installed (for running the language server)
+    - MATLAB path can be specified via MATLAB_PATH environment variable or auto-detected
+
+The MATLAB language server provides:
+    - Code diagnostics (publishDiagnostics)
+    - Code completions (completionProvider)
+    - Go to definition (definitionProvider)
+    - Find references (referencesProvider)
+    - Document symbols (documentSymbol)
+    - Document formatting (documentFormattingProvider)
+    - Function signature help (signatureHelpProvider)
+    - Symbol rename (renameProvider)
+"""
+
+import glob
+import logging
+import os
+import pathlib
+import platform
+import shutil
+import threading
+import zipfile
+from typing import Any, cast
+
+import requests
+
+from solidlsp.ls import LSPFileBuffer, SolidLanguageServer
+from solidlsp.ls_config import LanguageServerConfig
+from solidlsp.lsp_protocol_handler.lsp_types import DocumentSymbol, InitializeParams, SymbolInformation
+from solidlsp.lsp_protocol_handler.server import ProcessLaunchInfo
+from solidlsp.settings import SolidLSPSettings
+
+log = logging.getLogger(__name__)
+
+# Environment variable for MATLAB installation path
+MATLAB_PATH_ENV_VAR = "MATLAB_PATH"
+
+# VS Code Marketplace URL for MATLAB extension
+MATLAB_EXTENSION_URL = (
+    "https://marketplace.visualstudio.com/_apis/public/gallery/publishers/MathWorks/vsextensions/language-matlab/latest/vspackage"
+)
+
+
+class MatlabLanguageServer(SolidLanguageServer):
+    """
+    Provides MATLAB specific instantiation of the LanguageServer class using the official
+    MathWorks MATLAB Language Server.
+
+    The MATLAB language server requires:
+        - MATLAB R2021b or later installed on the system
+        - Node.js for running the language server
+
+    The language server is automatically downloaded from the VS Code marketplace
+    (MathWorks.language-matlab extension) and extracted.
+
+    You can pass the following entries in ls_specific_settings["matlab"]:
+        - matlab_path: Path to MATLAB installation (overrides MATLAB_PATH env var)
+    """
+
+    @staticmethod
+    def _find_matlab_installation() -> str:
+        """
+        Find MATLAB installation path.
+
+        Search order:
+            1. MATLAB_PATH environment variable
+            2. Common installation locations based on platform
+
+        Returns:
+            Path to MATLAB installation directory.
+
+        Raises:
+            RuntimeError: If MATLAB installation is not found.
+
+        """
+        # Check environment variable first
+        matlab_path = os.environ.get(MATLAB_PATH_ENV_VAR)
+        if matlab_path and os.path.isdir(matlab_path):
+            log.info(f"Using MATLAB from environment variable {MATLAB_PATH_ENV_VAR}: {matlab_path}")
+            return matlab_path
+
+        system = platform.system()
+
+        if system == "Darwin":  # macOS
+            # Check common macOS locations
+            search_patterns = [
+                "/Applications/MATLAB_*.app",
+                "/Volumes/*/Applications/MATLAB_*.app",
+                os.path.expanduser("~/Applications/MATLAB_*.app"),
+            ]
+            for pattern in search_patterns:
+                matches = sorted(glob.glob(pattern), reverse=True)  # Newest version first
+                for match in matches:
+                    if os.path.isdir(match):
+                        log.info(f"Found MATLAB installation: {match}")
+                        return match
+
+        elif system == "Windows":
+            # Check common Windows locations
+            search_patterns = [
+                "C:\\Program Files\\MATLAB\\R*",
+                "C:\\Program Files (x86)\\MATLAB\\R*",
+            ]
+            for pattern in search_patterns:
+                matches = sorted(glob.glob(pattern), reverse=True)
+                for match in matches:
+                    if os.path.isdir(match):
+                        log.info(f"Found MATLAB installation: {match}")
+                        return match
+
+        elif system == "Linux":
+            # Check common Linux locations
+            search_patterns = [
+                "/usr/local/MATLAB/R*",
+                "/opt/MATLAB/R*",
+                os.path.expanduser("~/MATLAB/R*"),
+            ]
+            for pattern in search_patterns:
+                matches = sorted(glob.glob(pattern), reverse=True)
+                for match in matches:
+                    if os.path.isdir(match):
+                        log.info(f"Found MATLAB installation: {match}")
+                        return match
+
+        raise RuntimeError(
+            f"MATLAB installation not found. Set the {MATLAB_PATH_ENV_VAR} environment variable "
+            "to your MATLAB installation directory (e.g., /Applications/MATLAB_R2024b.app on macOS, "
+            "C:\\Program Files\\MATLAB\\R2024b on Windows, or /usr/local/MATLAB/R2024b on Linux)."
+        )
+
+    def __init__(self, config: LanguageServerConfig, repository_root_path: str, solidlsp_settings: SolidLSPSettings):
+        """
+        Creates a MatlabLanguageServer instance. This class is not meant to be instantiated directly.
+        Use LanguageServer.create() instead.
+        """
+        matlab_lsp_command, matlab_path = self._setup_runtime_dependencies(config, solidlsp_settings)
+        self._matlab_path = matlab_path
+
+        # Set environment for MATLAB
+        proc_env = {
+            "MATLAB_INSTALL_PATH": matlab_path,
+        }
+
+        super().__init__(
+            config,
+            repository_root_path,
+            ProcessLaunchInfo(cmd=matlab_lsp_command, cwd=repository_root_path, env=proc_env),
+            "matlab",
+            solidlsp_settings,
+        )
+        self.server_ready = threading.Event()
+        self.initialize_searcher_command_available = threading.Event()
+
+    @classmethod
+    def _download_matlab_extension(cls, url: str, target_dir: str) -> bool:
+        """
+        Download and extract the MATLAB extension from VS Code marketplace.
+
+        The VS Code marketplace packages extensions as .vsix files (which are ZIP archives).
+        This method downloads the VSIX file and extracts it to get the language server.
+
+        Args:
+            url: VS Code marketplace URL for the MATLAB extension
+            target_dir: Directory where the extension will be extracted
+
+        Returns:
+            True if successful, False otherwise
+
+        """
+        try:
+            log.info(f"Downloading MATLAB extension from {url}")
+
+            # Create target directory for the extension
+            os.makedirs(target_dir, exist_ok=True)
+
+            # Download with proper headers to mimic VS Code marketplace client
+            headers = {
+                "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36",
+                "Accept": "application/octet-stream, application/vsix, */*",
+            }
+
+            response = requests.get(url, headers=headers, stream=True, timeout=300)
+            response.raise_for_status()
+
+            # Save to temporary VSIX file
+            temp_file = os.path.join(target_dir, "matlab_extension_temp.vsix")
+            total_size = int(response.headers.get("content-length", 0))
+
+            log.info(f"Downloading {total_size / 1024 / 1024:.1f} MB...")
+
+            with open(temp_file, "wb") as f:
+                downloaded = 0
+                for chunk in response.iter_content(chunk_size=8192):
+                    if chunk:
+                        f.write(chunk)
+                        downloaded += len(chunk)
+                        if total_size > 0 and downloaded % (10 * 1024 * 1024) == 0:
+                            progress = (downloaded / total_size) * 100
+                            log.info(f"Download progress: {progress:.1f}%")
+
+            log.info("Download complete, extracting...")
+
+            # Extract VSIX file (VSIX files are ZIP archives)
+            with zipfile.ZipFile(temp_file, "r") as zip_ref:
+                zip_ref.extractall(target_dir)
+
+            # Clean up temp file
+            os.remove(temp_file)
+
+            log.info("MATLAB extension extracted successfully")
+            return True
+
+        except Exception as e:
+            log.error(f"Error downloading/extracting MATLAB extension: {e}")
+            return False
+
+    @classmethod
+    def _find_matlab_extension(cls, solidlsp_settings: SolidLSPSettings) -> str | None:
+        """
+        Find MATLAB extension in various locations.
+
+        Search order:
+        1. Environment variable (MATLAB_EXTENSION_PATH)
+        2. Default download location (~/.serena/ls_resources/matlab-extension)
+        3. VS Code installed extensions
+
+        Returns:
+            Path to MATLAB extension directory or None if not found
+
+        """
+        # Check environment variable
+        env_path = os.environ.get("MATLAB_EXTENSION_PATH")
+        if env_path and os.path.exists(env_path):
+            log.debug(f"Found MATLAB extension via MATLAB_EXTENSION_PATH: {env_path}")
+            return env_path
+        elif env_path:
+            log.warning(f"MATLAB_EXTENSION_PATH set but directory not found: {env_path}")
+
+        # Check default download location
+        default_path = os.path.join(cls.ls_resources_dir(solidlsp_settings), "matlab-extension", "extension")
+        if os.path.exists(default_path):
+            log.debug(f"Found MATLAB extension in default location: {default_path}")
+            return default_path
+
+        # Search VS Code extensions
+        vscode_extensions_dir = os.path.expanduser("~/.vscode/extensions")
+        if os.path.exists(vscode_extensions_dir):
+            for entry in os.listdir(vscode_extensions_dir):
+                if entry.startswith("mathworks.language-matlab"):
+                    ext_path = os.path.join(vscode_extensions_dir, entry)
+                    if os.path.isdir(ext_path):
+                        log.debug(f"Found MATLAB extension in VS Code: {ext_path}")
+                        return ext_path
+
+        log.debug("MATLAB extension not found in any known location")
+        return None
+
+    @classmethod
+    def _download_and_install_matlab_extension(cls, solidlsp_settings: SolidLSPSettings) -> str | None:
+        """
+        Download and install MATLAB extension from VS Code marketplace.
+
+        Returns:
+            Path to installed extension or None if download failed
+
+        """
+        matlab_extension_dir = os.path.join(cls.ls_resources_dir(solidlsp_settings), "matlab-extension")
+
+        log.info(f"Downloading MATLAB extension from: {MATLAB_EXTENSION_URL}")
+
+        if cls._download_matlab_extension(MATLAB_EXTENSION_URL, matlab_extension_dir):
+            extension_path = os.path.join(matlab_extension_dir, "extension")
+            if os.path.exists(extension_path):
+                log.info("MATLAB extension downloaded and installed successfully")
+                return extension_path
+            else:
+                log.error(f"Download completed but extension not found at: {extension_path}")
+        else:
+            log.error("Failed to download MATLAB extension from marketplace")
+
+        return None
+
+    @classmethod
+    def _get_executable_path(cls, extension_path: str, system: str) -> str:
+        """
+        Get the path to the MATLAB language server executable based on platform.
+
+        The language server is a Node.js script located in the extension's server directory.
+        """
+        # The MATLAB extension bundles the language server in the 'server' directory
+        server_dir = os.path.join(extension_path, "server", "out")
+        main_script = os.path.join(server_dir, "index.js")
+
+        if os.path.exists(main_script):
+            return main_script
+
+        # Alternative location
+        alt_script = os.path.join(extension_path, "out", "index.js")
+        if os.path.exists(alt_script):
+            return alt_script
+
+        raise RuntimeError(f"MATLAB language server script not found in extension at {extension_path}")
+
+    @classmethod
+    def _setup_runtime_dependencies(cls, config: LanguageServerConfig, solidlsp_settings: SolidLSPSettings) -> tuple[list[str], str]:
+        """
+        Setup runtime dependencies for MATLAB Language Server and return the command to start the server.
+
+        Returns:
+            Tuple of (command to start the server, MATLAB installation path)
+
+        """
+        system = platform.system()
+
+        # Verify node is installed
+        node_path = shutil.which("node")
+        if node_path is None:
+            raise RuntimeError("Node.js is not installed or isn't in PATH. Please install Node.js and try again.")
+
+        # Get MATLAB path from settings or auto-detect
+        language_specific_config = solidlsp_settings.get_ls_specific_settings(cls.get_language_enum_instance())
+        matlab_path = language_specific_config.get("matlab_path")
+
+        if not matlab_path:
+            matlab_path = cls._find_matlab_installation()  # Raises RuntimeError if not found
+
+        # Verify MATLAB path exists
+        if not os.path.isdir(matlab_path):
+            raise RuntimeError(f"MATLAB installation directory does not exist: {matlab_path}")
+
+        log.info(f"Using MATLAB installation: {matlab_path}")
+
+        # Find existing extension or download if needed
+        extension_path = cls._find_matlab_extension(solidlsp_settings)
+        if extension_path is None:
+            log.info("MATLAB extension not found on disk, attempting to download...")
+            extension_path = cls._download_and_install_matlab_extension(solidlsp_settings)
+
+        if extension_path is None:
+            raise RuntimeError(
+                "Failed to locate or download MATLAB Language Server. Please either:\n"
+                "1. Set MATLAB_EXTENSION_PATH environment variable to the MATLAB extension directory\n"
+                "2. Install the MATLAB extension in VS Code (MathWorks.language-matlab)\n"
+                "3. Ensure internet connection for automatic download"
+            )
+
+        # Get the language server script path
+        server_script = cls._get_executable_path(extension_path, system)
+
+        if not os.path.exists(server_script):
+            raise RuntimeError(f"MATLAB Language Server script not found at: {server_script}")
+
+        # Build the command to run the language server
+        # The MATLAB language server is run via Node.js with the --stdio flag
+        cmd = [node_path, server_script, "--stdio"]
+
+        return cmd, matlab_path
+
+    @staticmethod
+    def _get_initialize_params(repository_absolute_path: str) -> InitializeParams:
+        """Return the initialize params for the MATLAB Language Server."""
+        root_uri = pathlib.Path(repository_absolute_path).as_uri()
+        initialize_params = {
+            "locale": "en",
+            "capabilities": {
+                "textDocument": {
+                    "synchronization": {"didSave": True, "dynamicRegistration": True},
+                    "completion": {
+                        "dynamicRegistration": True,
+                        "completionItem": {"snippetSupport": True},
+                    },
+                    "definition": {"dynamicRegistration": True},
+                    "references": {"dynamicRegistration": True},
+                    "documentSymbol": {
+                        "dynamicRegistration": True,
+                        "hierarchicalDocumentSymbolSupport": True,
+                        "symbolKind": {"valueSet": list(range(1, 27))},
+                    },
+                    "hover": {"dynamicRegistration": True, "contentFormat": ["markdown", "plaintext"]},
+                    "signatureHelp": {"dynamicRegistration": True},
+                    "codeAction": {"dynamicRegistration": True},
+                    "formatting": {"dynamicRegistration": True},
+                    "rename": {"dynamicRegistration": True, "prepareSupport": True},
+                    "publishDiagnostics": {"relatedInformation": True},
+                },
+                "workspace": {
+                    "workspaceFolders": True,
+                    "didChangeConfiguration": {"dynamicRegistration": True},
+                    "symbol": {"dynamicRegistration": True},
+                },
+            },
+            "processId": os.getpid(),
+            "rootPath": repository_absolute_path,
+            "rootUri": root_uri,
+            "workspaceFolders": [
+                {
+                    "uri": root_uri,
+                    "name": os.path.basename(repository_absolute_path),
+                }
+            ],
+        }
+        return cast(InitializeParams, initialize_params)
+
+    def _start_server(self) -> None:
+        """Start the MATLAB Language Server and wait for it to be ready."""
+        root_uri = pathlib.Path(self.repository_root_path).as_uri()
+
+        def register_capability_handler(params: dict) -> None:
+            assert "registrations" in params
+            for registration in params["registrations"]:
+                if registration["method"] == "workspace/executeCommand":
+                    self.initialize_searcher_command_available.set()
+            return
+
+        def execute_client_command_handler(params: dict) -> list:
+            return []
+
+        def workspace_folders_handler(params: dict) -> list:
+            """Handle workspace/workspaceFolders request from the server."""
+            return [{"uri": root_uri, "name": os.path.basename(self.repository_root_path)}]
+
+        def workspace_configuration_handler(params: dict) -> list:
+            """Handle workspace/configuration request from the server."""
+            items = params.get("items", [])
+            result = []
+            for item in items:
+                section = item.get("section", "")
+                if section == "MATLAB":
+                    # Return MATLAB configuration
+                    result.append({"installPath": self._matlab_path, "matlabConnectionTiming": "onStart"})
+                else:
+                    result.append({})
+            return result
+
+        def do_nothing(params: dict) -> None:
+            return
+
+        def window_log_message(msg: dict) -> None:
+            log.info(f"LSP: window/logMessage: {msg}")
+            message_text = msg.get("message", "")
+            # Check for MATLAB language server ready signals
+            # Wait for "MVM attach success" or "Adding workspace folder" which indicates MATLAB is fully ready
+            # Note: "connected to" comes earlier but the server isn't fully ready at that point
+            if "mvm attach success" in message_text.lower() or "adding workspace folder" in message_text.lower():
+                log.info("MATLAB language server ready signal detected (MVM attached)")
+                self.server_ready.set()
+                self.completions_available.set()
+
+        self.server.on_request("client/registerCapability", register_capability_handler)
+        self.server.on_notification("window/logMessage", window_log_message)
+        self.server.on_request("workspace/executeClientCommand", execute_client_command_handler)
+        self.server.on_request("workspace/workspaceFolders", workspace_folders_handler)
+        self.server.on_request("workspace/configuration", workspace_configuration_handler)
+        self.server.on_notification("$/progress", do_nothing)
+        self.server.on_notification("textDocument/publishDiagnostics", do_nothing)
+
+        log.info("Starting MATLAB server process")
+        self.server.start()
+        initialize_params = self._get_initialize_params(self.repository_root_path)
+
+        log.info("Sending initialize request from LSP client to LSP server and awaiting response")
+        init_response = self.server.send.initialize(initialize_params)
+        log.debug(f"Received initialize response from MATLAB server: {init_response}")
+
+        # Verify basic capabilities
+        capabilities = init_response.get("capabilities", {})
+        assert capabilities.get("textDocumentSync") in [1, 2], "Expected Full or Incremental text sync"
+
+        # Log available capabilities
+        if "completionProvider" in capabilities:
+            log.info("MATLAB server supports completions")
+        if "definitionProvider" in capabilities:
+            log.info("MATLAB server supports go-to-definition")
+        if "referencesProvider" in capabilities:
+            log.info("MATLAB server supports find-references")
+        if "documentSymbolProvider" in capabilities:
+            log.info("MATLAB server supports document symbols")
+        if "documentFormattingProvider" in capabilities:
+            log.info("MATLAB server supports document formatting")
+        if "renameProvider" in capabilities:
+            log.info("MATLAB server supports rename")
+
+        self.server.notify.initialized({})
+
+        # Wait for server readiness with timeout
+        # MATLAB takes longer to start than most language servers (typically 10-30 seconds)
+        log.info("Waiting for MATLAB language server to be ready (this may take up to 60 seconds)...")
+        if not self.server_ready.wait(timeout=60.0):
+            # Fallback: assume server is ready after timeout
+            log.info("Timeout waiting for MATLAB server ready signal, proceeding anyway")
+            self.server_ready.set()
+            self.completions_available.set()
+        else:
+            log.info("MATLAB server initialization complete")
+
+    def is_ignored_dirname(self, dirname: str) -> bool:
+        """Define MATLAB-specific directories to ignore."""
+        return super().is_ignored_dirname(dirname) or dirname in [
+            "slprj",  # Simulink project files
+            "codegen",  # Code generation output
+            "sldemo_cache",  # Simulink demo cache
+            "helperFiles",  # Common helper file directories
+        ]
+
+    def _request_document_symbols(
+        self, relative_file_path: str, file_data: LSPFileBuffer | None
+    ) -> list[SymbolInformation] | list[DocumentSymbol] | None:
+        """
+        Override to normalize MATLAB symbol names.
+
+        The MATLAB LSP sometimes returns symbol names as lists instead of strings,
+        particularly for script sections (cell mode markers like %%). This method
+        normalizes the names to strings for compatibility with the unified symbol format.
+        """
+        symbols = super()._request_document_symbols(relative_file_path, file_data)
+
+        if symbols is None or len(symbols) == 0:
+            return symbols
+
+        self._normalize_matlab_symbols(symbols)
+        return symbols
+
+    def _normalize_matlab_symbols(self, symbols: list[SymbolInformation] | list[DocumentSymbol]) -> None:
+        """
+        Normalize MATLAB symbol names in-place.
+
+        MATLAB LSP returns section names as lists like ["Section Name"] instead of
+        strings. This converts them to plain strings.
+        """
+        for symbol in symbols:
+            # MATLAB LSP returns names as lists for script sections, violating LSP spec
+            # Cast to Any to handle runtime type that differs from spec
+            name: Any = symbol.get("name")
+            if isinstance(name, list):
+                symbol["name"] = name[0] if name else ""
+                log.debug("Normalized MATLAB symbol name from list to string")
+
+            # Recursively normalize children if present
+            children: Any = symbol.get("children")
+            if children and isinstance(children, list):
+                self._normalize_matlab_symbols(children)

src/solidlsp/ls_config.py

@@ -64,6 +64,11 @@ class Language(str, Enum):
     GROOVY = "groovy"
     VUE = "vue"
     POWERSHELL = "powershell"
+    MATLAB = "matlab"
+    """MATLAB language server using the official MathWorks MATLAB Language Server.
+    Requires MATLAB R2021b or later and Node.js.
+    Set MATLAB_PATH environment variable or configure matlab_path in ls_specific_settings.
+    """
     # Experimental or deprecated Language Servers
     TYPESCRIPT_VTS = "typescript_vts"
     """Use the typescript language server through the natively bundled vscode extension via https://github.com/yioneko/vtsls"""
@@ -225,6 +230,8 @@ class Language(str, Enum):
                 return FilenameMatcher("*.ps1", "*.psm1", "*.psd1")
             case self.GROOVY:
                 return FilenameMatcher("*.groovy", "*.gvy")
+            case self.MATLAB:
+                return FilenameMatcher("*.m", "*.mlx", "*.mlapp")
             case _:
                 raise ValueError(f"Unhandled language: {self}")
 
@@ -390,6 +397,10 @@ class Language(str, Enum):
                 from solidlsp.language_servers.groovy_language_server import GroovyLanguageServer
 
                 return GroovyLanguageServer
+            case self.MATLAB:
+                from solidlsp.language_servers.matlab_language_server import MatlabLanguageServer
+
+                return MatlabLanguageServer
             case _:
                 raise ValueError(f"Unhandled language: {self}")
 

test/resources/repos/matlab/test_repo/Calculator.m

@@ -0,0 +1,81 @@
+classdef Calculator < handle
+    % Calculator A simple calculator class for testing MATLAB LSP
+    %
+    % This class provides basic arithmetic operations and demonstrates
+    % MATLAB class structure for LSP testing purposes.
+
+    properties
+        LastResult double = 0
+        History cell = {}
+    end
+
+    properties (Access = private)
+        OperationCount uint32 = 0
+    end
+
+    methods
+        function obj = Calculator()
+            % Constructor for Calculator class
+            obj.LastResult = 0;
+            obj.History = {};
+            obj.OperationCount = 0;
+        end
+
+        function result = add(obj, a, b)
+            % ADD Add two numbers
+            %   result = add(obj, a, b) returns the sum of a and b
+            result = a + b;
+            obj.updateState(result, 'add');
+        end
+
+        function result = subtract(obj, a, b)
+            % SUBTRACT Subtract b from a
+            %   result = subtract(obj, a, b) returns a - b
+            result = a - b;
+            obj.updateState(result, 'subtract');
+        end
+
+        function result = multiply(obj, a, b)
+            % MULTIPLY Multiply two numbers
+            %   result = multiply(obj, a, b) returns a * b
+            result = a * b;
+            obj.updateState(result, 'multiply');
+        end
+
+        function result = divide(obj, a, b)
+            % DIVIDE Divide a by b
+            %   result = divide(obj, a, b) returns a / b
+            %   Throws error if b is zero
+            if b == 0
+                error('Calculator:DivisionByZero', 'Cannot divide by zero');
+            end
+            result = a / b;
+            obj.updateState(result, 'divide');
+        end
+
+        function displayHistory(obj)
+            % DISPLAYHISTORY Display the calculation history
+            fprintf('Calculation History:\n');
+            for i = 1:length(obj.History)
+                fprintf('  %d: %s = %.4f\n', i, obj.History{i}.operation, obj.History{i}.result);
+            end
+        end
+    end
+
+    methods (Access = private)
+        function updateState(obj, result, operation)
+            % Update internal state after an operation
+            obj.LastResult = result;
+            obj.OperationCount = obj.OperationCount + 1;
+            obj.History{end+1} = struct('operation', operation, 'result', result);
+        end
+    end
+
+    methods (Static)
+        function result = power(base, exponent)
+            % POWER Compute base raised to exponent
+            %   result = Calculator.power(base, exponent) returns base^exponent
+            result = base ^ exponent;
+        end
+    end
+end

test/resources/repos/matlab/test_repo/main.m

@@ -0,0 +1,67 @@
+% MAIN Main script demonstrating Calculator and mathUtils usage
+%
+% This script shows how to use the Calculator class and mathUtils
+% functions together for various mathematical operations.
+
+% Add lib folder to path
+addpath('lib');
+
+%% Section 1: Basic Calculator Operations
+% Create a calculator instance and perform basic operations
+
+calc = Calculator();
+
+% Perform some calculations
+sum_result = calc.add(10, 5);
+fprintf('10 + 5 = %d\n', sum_result);
+
+diff_result = calc.subtract(10, 3);
+fprintf('10 - 3 = %d\n', diff_result);
+
+prod_result = calc.multiply(4, 7);
+fprintf('4 * 7 = %d\n', prod_result);
+
+quot_result = calc.divide(20, 4);
+fprintf('20 / 4 = %d\n', quot_result);
+
+%% Section 2: Static Method Usage
+% Use the static power method
+
+power_result = Calculator.power(2, 10);
+fprintf('2^10 = %d\n', power_result);
+
+%% Section 3: Math Utilities
+% Test the mathUtils functions
+
+% Factorial
+fact5 = mathUtils('factorial', 5);
+fprintf('5! = %d\n', fact5);
+
+% Fibonacci
+fib10 = mathUtils('fibonacci', 10);
+fprintf('Fibonacci(10) = %d\n', fib10);
+
+% Prime check
+is17prime = mathUtils('isPrime', 17);
+fprintf('Is 17 prime? %s\n', mat2str(is17prime));
+
+% Statistics
+data = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
+[dataMean, dataStd] = mathUtils('stats', data);
+fprintf('Mean: %.2f, Std: %.2f\n', dataMean, dataStd);
+
+%% Section 4: Display History
+% Show all calculations performed by the calculator
+
+calc.displayHistory();
+
+%% Section 5: Error Handling
+% Demonstrate error handling with division by zero
+
+try
+    calc.divide(10, 0);
+catch ME
+    fprintf('Caught expected error: %s\n', ME.message);
+end
+
+fprintf('\nAll tests completed successfully!\n');

test/solidlsp/matlab/__init__.py

@@ -0,0 +1 @@
+# MATLAB language server tests

test/solidlsp/matlab/test_matlab_basic.py

@@ -0,0 +1,117 @@
+"""
+Basic integration tests for the MATLAB language server functionality.
+
+These tests validate the functionality of the language server APIs
+like request_document_symbols using the MATLAB test repository.
+
+Requirements:
+    - MATLAB R2021b or later must be installed
+    - MATLAB_PATH environment variable should be set to MATLAB installation directory
+    - Node.js and npm must be installed
+"""
+
+import os
+
+import pytest
+
+from solidlsp import SolidLanguageServer
+from solidlsp.ls_config import Language
+
+# Skip all tests if MATLAB is not available
+pytestmark = pytest.mark.matlab
+
+# Check if MATLAB is available
+MATLAB_AVAILABLE = os.environ.get("MATLAB_PATH") is not None or any(
+    os.path.exists(p)
+    for p in [
+        "/Applications/MATLAB_R2024b.app",
+        "/Applications/MATLAB_R2025b.app",
+        "/Volumes/S1/Applications/MATLAB_R2024b.app",
+        "/Volumes/S1/Applications/MATLAB_R2025b.app",
+    ]
+)
+
+
+@pytest.mark.skipif(not MATLAB_AVAILABLE, reason="MATLAB installation not found")
+class TestMatlabLanguageServerBasics:
+    """Test basic functionality of the MATLAB language server."""
+
+    @pytest.mark.parametrize("language_server", [Language.MATLAB], indirect=True)
+    def test_matlab_language_server_initialization(self, language_server: SolidLanguageServer) -> None:
+        """Test that MATLAB language server can be initialized successfully."""
+        assert language_server is not None
+        assert language_server.language == Language.MATLAB
+
+    @pytest.mark.parametrize("language_server", [Language.MATLAB], indirect=True)
+    def test_matlab_request_document_symbols_class(self, language_server: SolidLanguageServer) -> None:
+        """Test request_document_symbols for MATLAB class file."""
+        # Test getting symbols from Calculator.m (class file)
+        all_symbols, _root_symbols = language_server.request_document_symbols("Calculator.m").get_all_symbols_and_roots()
+
+        # Extract class symbols (LSP Symbol Kind 5 for class)
+        class_symbols = [symbol for symbol in all_symbols if symbol.get("kind") == 5]
+        class_names = [symbol["name"] for symbol in class_symbols]
+
+        # Should find the Calculator class
+        assert "Calculator" in class_names, "Should find Calculator class"
+
+        # Extract method symbols (LSP Symbol Kind 6 for method or 12 for function)
+        method_symbols = [symbol for symbol in all_symbols if symbol.get("kind") in [6, 12]]
+        method_names = [symbol["name"] for symbol in method_symbols]
+
+        # Should find key methods
+        expected_methods = ["add", "subtract", "multiply", "divide"]
+        for method in expected_methods:
+            assert method in method_names, f"Should find {method} method in Calculator class"
+
+    @pytest.mark.parametrize("language_server", [Language.MATLAB], indirect=True)
+    def test_matlab_request_document_symbols_function(self, language_server: SolidLanguageServer) -> None:
+        """Test request_document_symbols for MATLAB function file."""
+        # Test getting symbols from lib/mathUtils.m (function file)
+        all_symbols, _root_symbols = language_server.request_document_symbols("lib/mathUtils.m").get_all_symbols_and_roots()
+
+        # Extract function symbols (LSP Symbol Kind 12 for function)
+        function_symbols = [symbol for symbol in all_symbols if symbol.get("kind") == 12]
+        function_names = [symbol["name"] for symbol in function_symbols]
+
+        # Should find the main mathUtils function
+        assert "mathUtils" in function_names, "Should find mathUtils function"
+
+        # Should also find nested/local functions
+        expected_local_functions = ["computeFactorial", "computeFibonacci", "checkPrime", "computeStats"]
+        for func in expected_local_functions:
+            assert func in function_names, f"Should find {func} local function"
+
+    @pytest.mark.parametrize("language_server", [Language.MATLAB], indirect=True)
+    def test_matlab_request_document_symbols_script(self, language_server: SolidLanguageServer) -> None:
+        """Test request_document_symbols for MATLAB script file."""
+        # Test getting symbols from main.m (script file)
+        all_symbols, _root_symbols = language_server.request_document_symbols("main.m").get_all_symbols_and_roots()
+
+        # Scripts may have variables and sections, but less structured symbols
+        # Just verify we can get symbols without errors
+        assert all_symbols is not None
+
+
+@pytest.mark.skipif(not MATLAB_AVAILABLE, reason="MATLAB installation not found")
+class TestMatlabLanguageServerReferences:
+    """Test find references functionality of the MATLAB language server."""
+
+    @pytest.mark.parametrize("language_server", [Language.MATLAB], indirect=True)
+    def test_matlab_find_references_within_file(self, language_server: SolidLanguageServer) -> None:
+        """Test finding references within a single MATLAB file."""
+        # Find references to 'result' variable in Calculator.m
+        # This is a basic test to verify references work
+        references = language_server.request_references("Calculator.m", 25, 12)  # 'result' in add method
+
+        # Should find at least the definition
+        assert references is not None
+
+    @pytest.mark.parametrize("language_server", [Language.MATLAB], indirect=True)
+    def test_matlab_find_references_cross_file(self, language_server: SolidLanguageServer) -> None:
+        """Test finding references across MATLAB files."""
+        # Find references to Calculator class used in main.m
+        references = language_server.request_references("main.m", 11, 8)  # 'Calculator' reference
+
+        # Should find references in both main.m and Calculator.m
+        assert references is not None