Add PHPStan

.github/workflows/lint.yaml

@@ -0,0 +1,32 @@
+name: Lint
+
+on:
+    push:
+        branches: [ master ]
+    pull_request:
+
+jobs:
+    tests:
+        runs-on: ubuntu-latest
+        name: Lint ${{ matrix.check.name }}
+        strategy:
+            fail-fast: false
+            matrix:
+                php: [ '8.1' ]
+                check:
+                    -   name: PHPStan
+                        command: make phpstan
+
+        steps:
+            -   name: Checkout
+                uses: actions/checkout@v2
+
+            -   name: Setup PHP
+                uses: shivammathur/setup-php@v2
+                with:
+                    php-version: "${{ matrix.php }}"
+                    tools: composer
+                    coverage: none
+
+            -   name: Run ${{ matrix.check.name }}
+                run: ${{ matrix.check.command }}

Makefile

@@ -5,6 +5,9 @@ PHPNOGC=php -d zend.enable_gc=0
 CCYELLOW=\033[0;33m
 CCEND=\033[0m
 
+PHPSTAN_BIN = vendor/phpstan/phpstan/phpstan
+PHPSTAN = $(PHPSTAN_BIN)
+
 .PHONY: help
 help:
 	@echo "\033[33mUsage:\033[0m\n  make TARGET\n\n\033[32m#\n# Commands\n#---------------------------------------------------------------------------\033[0m\n"
@@ -23,6 +26,14 @@ cs: $(PHP_CS_FIXER)
 	LC_ALL=C sort -u .gitignore -o .gitignore
 
 
+.PHONY: phpstan
+phpstan: ## Runs PHPStan
+phpstan: $(PHPSTAN_BIN) vendor
+ifndef SKIP_PHPSTAN
+	$(PHPSTAN) analyze
+endif
+
+
 #
 # Tests
 #---------------------------------------------------------------------------
@@ -48,5 +59,10 @@ vendor: composer.lock
 $(PHP_CS_FIXER): vendor
 	touch $@
 
+$(PHPSTAN_BIN): vendor
+ifndef SKIP_PHPSTAN
+	touch $@
+endif
+
 $(PHPUNIT): vendor
 	touch $@

composer.json

@@ -25,6 +25,7 @@
         "ext-json": "*",
         "bamarni/composer-bin-plugin": "^1.8",
         "ergebnis/composer-normalize": "^2.28",
+        "phpstan/phpstan": "^1.8",
         "phpunit/phpunit": "^8.4",
         "symfony/framework-bundle": "^4.4 || ^5.4 || ^6.0"
     },

phpstan.neon.dist

@@ -0,0 +1,7 @@
+parameters:
+    level: 6
+    paths:
+        - src
+        - tests
+    excludePaths:
+        - tests/Integration/var