Fix "False positive staticMethod.alreadyNarrowedType for Strings::length() inside numeric comparison"

.github/workflows/e2e-tests.yml

@@ -0,0 +1,56 @@
+# https://help.github.com/en/categories/automating-your-workflow-with-github-actions
+
+name: "E2E Tests"
+
+on:
+  pull_request:
+  push:
+    branches:
+      - "2.0.x"
+
+concurrency:
+  group: e2e-${{ github.head_ref || github.run_id }} # will be canceled on subsequent pushes in pull requests but not branches
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  e2e-tests:
+    name: "E2E tests"
+    runs-on: "ubuntu-latest"
+    timeout-minutes: 60
+
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - script: |
+              cd e2e/bug-208
+              composer install
+              vendor/bin/phpstan
+
+    steps:
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@9af89fc71515a100421586dfdb3dc9c984fbf411 # v2.19.4
+        with:
+          egress-policy: audit
+
+      - name: "Checkout"
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+      - name: "Install PHP"
+        uses: "shivammathur/setup-php@7c071dfe9dc99bdf297fa79cb49ea005b9fcadbc" # v2.37.1
+        with:
+          coverage: "none"
+          php-version: "8.3"
+
+      - uses: "ramsey/composer-install@65e4f84970763564f46a70b8a54b90d033b3bdda" # v4.0.0
+
+      - name: "Install bashunit"
+        uses: "TypedDevs/bashunit@ffa9c79e71ecbb9990e777348bc9ba12314b62d0" # 0.39.1
+        with:
+          directory: "e2e"
+
+      - name: "Test"
+        run: ${{ matrix.script }}

e2e/bug-208/.gitignore

@@ -0,0 +1,2 @@
+/vendor
+composer.lock

e2e/bug-208/composer.json

@@ -0,0 +1,13 @@
+{
+    "require-dev": {
+		"nette/utils": "^3.2.5",
+		"phpstan/phpstan-nette": "@dev",
+		"phpstan/phpstan": "@dev"
+    },
+	"repositories": [
+		{
+			"type": "path",
+			"url": "../../"
+		}
+	]
+}

e2e/bug-208/phpstan.neon

@@ -0,0 +1,8 @@
+includes:
+    - ../../extension.neon
+    - ../../rules.neon
+
+parameters:
+	level: 8
+	paths:
+		- src

e2e/bug-208/src/foo.php

@@ -0,0 +1,18 @@
+<?php
+declare(strict_types=1);
+
+use Nette\Utils\Strings;
+
+function withoutPriorCheck(string $body): void
+{
+	if (Strings::length($body) < 100) { // no error
+		echo 'a';
+	}
+}
+
+function withPriorCheck(string $body): void
+{
+	if ($body !== '' && Strings::length($body) < 100) { // false positive
+		echo 'a';
+	}
+}

src/Type/Nette/StringsLengthTypeSpecifiyingExtension.php

@@ -54,7 +54,7 @@ public function specifyTypes(MethodReflection $staticMethodReflection, StaticCal
 			new IntersectionType([new StringType(), new AccessoryNonEmptyStringType()]),
 			$context,
 			$scope,
-		);
+		)->setRootExpr($node);
 	}
 
 }