Add CLAUDE.md with project documentation for AI assistants

Provides comprehensive guidance covering project purpose, PHP/Nette
version compatibility, repository structure, extension types, build
commands, testing patterns, CI pipeline, and development guidelines.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: 2 people

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code when working with this repository.
+
+## Project Overview
+
+**phpstan/phpstan-nette** is a PHPStan extension that provides static analysis support for the [Nette Framework](https://nette.org/). It teaches PHPStan to understand Nette-specific patterns such as dynamic method return types, magic properties, component model conventions, and framework-specific coding rules.
+
+The extension is distributed via Composer as `phpstan/phpstan-nette` and is of type `phpstan-extension`.
+
+## PHP Version Support
+
+This repository supports **PHP 7.4+** (not just PHP 8.1+ like phpstan-src). All code must be compatible with PHP 7.4, 8.0, 8.1, 8.2, 8.3, and 8.4. Do not use language features unavailable in PHP 7.4.
+
+## Nette Version Support
+
+The extension supports multiple versions of Nette libraries:
+- `nette/application` ^3.0 (conflicts with <2.3.0)
+- `nette/di` ^3.0 (conflicts with <2.3.0)
+- `nette/forms` ^3.0 (conflicts with <2.3.0)
+- `nette/utils` ^2.3.0 || ^3.0.0 || ^4.0 (conflicts with <2.3.0)
+
+CI runs tests with both `--prefer-lowest` and highest dependency versions to ensure compatibility across all supported Nette versions.
+
+## Repository Structure
+
+```
+├── extension.neon       # Main extension config (type extensions, reflection, stubs)
+├── rules.neon           # Optional rules config (framework-specific rules)
+├── src/
+│   ├── Type/Nette/      # Dynamic return type extensions (12 files)
+│   ├── Reflection/Nette/ # Class reflection extensions (6 files)
+│   ├── Rule/Nette/      # PHPStan rules (4 files)
+│   └── Stubs/Nette/     # Stub file loader (1 file)
+├── stubs/               # PHPStan stub files for Nette classes (26 files)
+├── tests/
+│   ├── Type/Nette/      # Type extension tests + data/
+│   ├── Reflection/Nette/ # Reflection extension tests
+│   ├── Rule/Nette/      # Rule tests + data/
+│   └── bootstrap.php    # Test bootstrap (autoloader only)
+├── phpstan.neon         # PHPStan config for analysing this project itself
+├── phpunit.xml          # PHPUnit configuration
+├── Makefile             # Build commands
+└── composer.json        # Package definition
+```
+
+## Key Concepts
+
+### Extension Types
+
+1. **Dynamic Return Type Extensions** (`src/Type/Nette/`): Teach PHPStan the return types of Nette methods that depend on arguments or context (e.g., `Container::getComponent()` return type based on `createComponent*` methods, `ServiceLocator::getByType()` based on class string argument).
+
+2. **Class Reflection Extensions** (`src/Reflection/Nette/`): Make PHPStan understand magic properties and methods on `Nette\Utils\Html` and `Nette\SmartObject`/`Nette\Object` classes.
+
+3. **Rules** (`src/Rule/Nette/`): Framework-specific static analysis rules:
+   - `DoNotExtendNetteObjectRule` — Forbids extending deprecated `Nette\Object`
+   - `RethrowExceptionRule` — Ensures exceptions like `AbortException` are rethrown
+   - `RegularExpressionPatternRule` — Validates regex patterns in Nette Strings methods
+   - `PresenterInjectedPropertiesExtension` — Read/write extension for `@inject` properties
+
+4. **Stub Files** (`stubs/`): Provide more precise type information for Nette classes than the original source code. Referenced in `extension.neon` under `parameters.stubFiles`.
+
+### Configuration Files
+
+- **`extension.neon`**: Loaded automatically by phpstan/extension-installer. Registers all type extensions, reflection extensions, stub files, early terminating methods, and universal object crates.
+- **`rules.neon`**: Optional, must be explicitly included. Registers framework-specific rules and defines which Nette methods throw exceptions.
+
+## Common Commands
+
+```bash
+# Run all checks (lint, coding standard, tests, PHPStan analysis)
+make check
+
+# Run tests only
+make tests
+
+# Run PHPStan analysis on this project at level 8
+make phpstan
+
+# Run PHP parallel lint
+make lint
+
+# Run coding standard checks (requires build-cs setup)
+make cs-install   # First time: clone and install build-cs
+make cs           # Check coding standard
+make cs-fix       # Auto-fix coding standard violations
+```
+
+## Testing Patterns
+
+Tests use PHPStan's built-in testing infrastructure. There are three patterns:
+
+### Type Inference Tests
+- Extend `PHPStan\Testing\TypeInferenceTestCase`
+- Data files in `tests/Type/Nette/data/` contain PHP code with `assertType()` calls
+- Test methods yield from `$this->gatherAssertTypes(__DIR__ . '/data/file.php')`
+- Additional PHPStan config loaded via `getAdditionalConfigFiles()`
+
+### Reflection Extension Tests
+- Extend `PHPStan\Testing\PHPStanTestCase`
+- Create reflection provider with `$this->createReflectionProvider()`
+- Test `hasMethod()`, `getMethod()`, `hasProperty()`, `getProperty()` on class reflections
+- Use `@dataProvider` for parameterized tests
+
+### Rule Tests
+- Extend `PHPStan\Testing\RuleTestCase<RuleClass>`
+- Implement `getRule()` to return the rule instance
+- Call `$this->analyse([files], [[message, line], ...])` to verify expected errors
+- Test data files in `tests/Rule/Nette/data/`
+
+## CI Pipeline
+
+GitHub Actions workflow (`.github/workflows/build.yml`) on the `2.0.x` branch runs:
+1. **Lint** — PHP parallel lint on PHP 7.4–8.4
+2. **Coding Standard** — phpcs via phpstan/build-cs (2.x branch)
+3. **Tests** — PHPUnit on PHP 7.4–8.4 with lowest and highest dependencies
+4. **Static Analysis** — PHPStan level 8 on PHP 7.4–8.4 with lowest and highest dependencies
+
+## Development Guidelines
+
+- The main development branch is `2.0.x`.
+- PSR-4 autoloading: namespace `PHPStan\` maps to `src/`.
+- Tests use classmap autoloading from `tests/`.
+- PHPStan analysis runs at **level 8** with strict rules, phpunit extension, and deprecation rules.
+- Test data directories (`tests/*/data/*`) are excluded from PHPStan analysis.
+- The coding standard is defined externally in `phpstan/build-cs` (2.x branch).