Drupal LSP Server

Language Server Protocol implementation for Drupal projects providing intelligent IDE support for YAML service definitions, PHP dependency injection patterns, and code quality tools.

Features

YAML Support

• Autocomplete for service references with smart sorting (Core/Contrib/Custom)
• Autocomplete for route references (route:, route_name:, base_route:)
• Autocomplete for parent links in menu/task/action links
• Go-to-definition for service references (jumps to YAML or PHP class)
• Hover info with clickable links to definitions
• Diagnostics for undefined service references
• Diagnostics for undefined route references
• Diagnostics for undefined parent links
• Smart validation - skips dynamic routes (view., rest., jsonapi.*)

PHP Support

• Autocomplete for \Drupal::service() calls with pattern-aware suggestions
• Autocomplete for route references in routing methods:
  • Url::fromRoute('route_name')
  • $this->redirect('route_name')
  • $variable->setRedirect('route_name', ['params'])
  • Link::createFromRoute('title', 'route_name')
• Go-to-definition for DI container service strings
• Hover info with service details and clickable links
• Diagnostics for undefined services in DI patterns
• Diagnostics for undefined routes in routing methods
• Smart pattern matching - only triggers on legitimate container patterns, avoids false positives

Code Quality

• PHP_CodeSniffer integration (phpcs/phpcbf)
  • Auto-detects phpcs.xml/phpcs.xml.dist in project root
  • Format document command with phpcbf
  • Real-time diagnostics integration

Installation

npm install -g drupal-lsp-server

Or clone and build locally:

git clone https://github.com/syntlyx/drupal-lsp-server.git
cd drupal-lsp-server
npm install
npm run compile
npm link

Architecture

Modular provider-based architecture for maintainability and extensibility:

src/
├── providers/           # LSP capability implementations
│   ├── yaml/           # YAML-specific providers
│   │   ├── YamlCompletionProvider.ts
│   │   ├── YamlDefinitionProvider.ts
│   │   ├── YamlDiagnosticProvider.ts
│   │   ├── YamlHoverProvider.ts
│   │   ├── YamlServiceNameExtractor.ts
│   │   └── YamlRouteNameExtractor.ts
│   ├── php/            # PHP-specific providers
│   │   ├── PhpCompletionProvider.ts
│   │   ├── PhpDefinitionProvider.ts
│   │   ├── PhpDiagnosticProvider.ts
│   │   ├── PhpHoverProvider.ts
│   │   ├── PhpCsProvider.ts
│   │   ├── PhpServiceNameExtractor.ts
│   │   └── PhpRouteNameExtractor.ts
│   ├── base/           # Base provider classes
│   ├── ICompletionProvider.ts
│   ├── IDefinitionProvider.ts
│   ├── IDiagnosticProvider.ts
│   └── IHoverProvider.ts
├── parsers/            # Service, route, and link parsers
│   ├── YamlServiceParser.ts
│   ├── YamlRouteParser.ts
│   ├── YamlLinkParser.ts
│   └── CommonEntityRoutes.ts
├── utils/              # Helper utilities
│   ├── DrupalProjectResolver.ts
│   ├── CacheManager.ts
│   └── PhpCsBinaryResolver.ts
├── types/              # TypeScript interfaces
│   └── ServerSettings.ts
└── server.ts           # Main LSP server

Key Components

• Providers: Interface-based implementations for LSP features (completion, definition, diagnostics, hover)
• Parsers: YAML parsing for services, routes, and links with Core/Contrib/Custom categorization
• DrupalProjectResolver: Handles different Drupal installation patterns (root, web/, docroot/)
• PhpCsProvider: Integrates PHP_CodeSniffer for formatting and diagnostics
• Route Support: Comprehensive route autocomplete and validation with 90+ common entity routes

Performance

• Fast indexing: ~3ms for 687 services, sub-second for route/link parsing
• Smart caching: Parsed services, routes, and links cached in memory with infinite TTL
• Efficient pattern matching: Regex-based with early exits to avoid false positives
• Early Drupal detection: Prevents running in non-Drupal projects
• Real-time validation: Works even while typing (closing quotes optional)

Development

Prerequisites

• Node.js 20+
• TypeScript 5.6+
• A Drupal 9/10/11 project for testing

Build

npm install
npm run compile

Watch Mode

npm run watch

Lint

npm run lint
npm run lint:fix

Roadmap

Near-term

• Plugin/Module entity autocomplete
• Hook autocomplete and validation
• Form API autocomplete
• Entity field autocomplete
• Configuration entity autocomplete
• Twig template variable autocomplete

Contributing

Contributions welcome! The codebase is designed for extensibility:

1. Each file type has its own provider directory
2. Providers implement consistent interfaces
3. Add new completions by creating new provider classes
4. Keep parsers separate from providers

License

MIT License - see LICENSE file