Added Phan dev-dependency

- Updated composer.json
- Created Phan configuration
- Updated UXML class

.phan/config.php

@@ -0,0 +1,73 @@
+<?php
+/**
+ * This configuration will be read and overlaid on top of the
+ * default configuration. Command-line arguments will be applied
+ * after this file is read.
+ */
+return [
+    // Supported values: `'5.6'`, `'7.0'`, `'7.1'`, `'7.2'`, `'7.3'`,
+    // `'7.4'`, `null`.
+    // If this is set to `null`,
+    // then Phan assumes the PHP version which is closest to the minor version
+    // of the php executable used to execute Phan.
+    //
+    // Note that the **only** effect of choosing `'5.6'` is to infer
+    // that functions removed in php 7.0 exist.
+    // (See `backward_compatibility_checks` for additional options)
+    // TODO: Set this.
+    'target_php_version' => null,
+
+    // A list of directories that should be parsed for class and
+    // method information. After excluding the directories
+    // defined in exclude_analysis_directory_list, the remaining
+    // files will be statically analyzed for errors.
+    //
+    // Thus, both first-party and third-party code being used by
+    // your application should be included in this list.
+    'directory_list' => [
+        'src'
+    ],
+
+    // A regex used to match every file name that you want to
+    // exclude from parsing. Actual value will exclude every
+    // "test", "tests", "Test" and "Tests" folders found in
+    // "vendor/" directory.
+    'exclude_file_regex' => '@^vendor/.*/(tests?|Tests?)/@',
+
+    // A directory list that defines files that will be excluded
+    // from static analysis, but whose class and method
+    // information should be included.
+    //
+    // Generally, you'll want to include the directories for
+    // third-party code (such as "vendor/") in this list.
+    //
+    // n.b.: If you'd like to parse but not analyze 3rd
+    //       party code, directories containing that code
+    //       should be added to both the `directory_list`
+    //       and `exclude_analysis_directory_list` arrays.
+    'exclude_analysis_directory_list' => [
+        'vendor/'
+    ],
+
+    // Set to true in order to attempt to detect unused variables.
+    // `dead_code_detection` will also enable unused variable detection.
+    //
+    // This has a few known false positives, e.g. for loops or branches.
+    'unused_variable_detection' => true,
+
+    // If enabled, warn about throw statement where the exception types
+    // are not documented in the PHPDoc of functions, methods, and closures.
+    'warn_about_undocumented_throw_statements' => true,
+
+    // If enabled (and warn_about_undocumented_throw_statements is enabled),
+    // warn about function/closure/method calls that have (at)throws
+    // without the invoking method documenting that exception.
+    'warn_about_undocumented_exceptions_thrown_by_invoked_functions' => true,
+
+    // A list of plugin files to execute
+    // NOTE: values can be the base name without the extension for plugins bundled with Phan (E.g. 'AlwaysReturnPlugin')
+    // or relative/absolute paths to the plugin (Relative to the project root).
+    'plugins' => [
+        'PreferNamespaceUsePlugin',
+    ]
+];

composer.json

@@ -19,5 +19,8 @@
     "require": {
         "php": ">=7.1",
         "lib-libxml": "*"
+    },
+    "require-dev": {
+        "phan/phan": "^3.0"
     }
 }

src/UXML.php

@@ -36,7 +36,7 @@ public static function load(string $xmlString): self {
      * @param  DOMDocument|null $doc   Document instance
      * @return self                    New instamce
      */
-    public static function newInstance(string $name, ?string $value=null, array $attrs=[], DOMDocument $doc=null) {
+    public static function newInstance(string $name, ?string $value=null, array $attrs=[], DOMDocument $doc=null): self {
         $targetDoc = ($doc === null) ? new DOMDocument() : $doc;
         $domElement = $targetDoc->createElement($name, $value);
 
@@ -57,6 +57,7 @@ public static function newInstance(string $name, ?string $value=null, array $att
     /**
      * Class constructor
      * @param DOMElement $element DOM Element instance
+     * @suppress PhanUndeclaredProperty
      */
     public function __construct(DOMElement $element) {
         $this->element = $element;
@@ -114,6 +115,7 @@ public function getAll(string $xpath, ?int $limit=null): array {
         $domNodes = $xpathInstance->query($xpath, $this->element);
         foreach ($domNodes as $domNode) {
             if (!$domNode instanceof DOMElement) continue;
+            // @phan-suppress-next-line PhanUndeclaredProperty
             $res[] = $domNode->uxml ?? new self($domNode);
             if (($limit !== null) && (--$limit <= 0)) break;
         }