PHPCS: switch to phpcsdevcs (#259)

* Composer: require PHPCSDevCS

* PHPCS: switch to using the PHPCSDev standard

This commit:
* Switches out the `PSR2` ruleset in favour of the `PHPCSDev` ruleset.
    The PHPCSDev ruleset checks the following:
    > * Compliance with PSR-12, with a few select exceptions.
    > * Use of camelCase variable and function names.
    > * Use of normalized arrays.
    > * All files, classes, functions and properties are documented with a docblock and contain the minimally needed information.
    > * A number of arbitrary additional code style and QA checks.
    > * PHP cross-version compatibility, while allowing for tokens back-filled by PHPCS itself.
* For the PHP cross-version compatibility check, the minimum supported PHP version (`testVersion`) is set to PHP 5.4, in line with the `require`ment for this package per the `composer.json` file.
* In contrast to `PHPCSDev`/PSR12, the ruleset for the VariableAnalysis package will:
    - Enforce tabs instead of spaces.
    - Disallow a blank line at the start of a class.
        Note: this complies with PSR12. PHPCSDev already had the blank line enforcement in place prior to this being forbidden via the PSR12 standard, which is why it excludes the rule.
    - Not enforce most documentation checks.
    - Not enforce assignment operator alignment.
* Additionally, for the time being, the PSR12 line length guidelines will not be enforced.
    Enforcing those needs additional (manual) adjustments to the codebase which can be done at a later point in time.
* Adds some extra documention to the ruleset.

Refs:
* https://github.com/PHPCSStandards/PHPCSDevCS
* https://github.com/PHPCSStandards/PHPCSDevCS/blob/main/PHPCSDev/ruleset.xml

* CS: various minor whitespace fixes

Minimal changes needed to comply with the PSR12/PHPCSDev whitespace rules.

Most notably this commit adds a blank line between a PHP open tag and the namespace declaration as per the PSR12 file header rules.

* CS: minor code restructuring [1]

The `VariableAnalysisSniff::processVariableAsSuperGlobal()` method checks a variable name against a fixed array of names using `in_array()`.

To comply with the updated CS rules, each parameter in the function call would need to be placed on a new line and the function call itself as well, making this a very drawn out condition.

By restructuring the code to declare the array prior to the `in_array()` function call, this is no longer needed.

Additional notes:
* I've also changed the `in_array()` call to a _strict_ comparison by adding the third parameter and setting it to `true`.
* I've simplified the `return` by removing the unnecessary condition and double return statements.
* The array could/should probably be declared as a property instead of within the function.
    I've not done so at this time, as it could also be considered to switch over to using the PHPCSUtils `Variables::isSuperglobal()` or `Variables::isSuperglobalName()` methods in the future.

Ref:
* https://www.php.net/manual/en/function.in-array.php
* https://phpcsutils.com/phpdoc/classes/PHPCSUtils-Utils-Variables.html#property_phpReservedVars

* CS: minor code restructuring [2]

Similar to the previous commit, the `VariableAnalysisSniff::processVariableAsStaticDeclaration()` method declares an array within a function call.

This commit moves the array declaration out of the function call and leverages a pre-defined array from the PHPCS native `Tokens` class to retrieve a number of the tokens (heredoc and nowdoc tokens).

Note: this commit does **not** fix known shortcomings of this method as reported in 158 and 253.

Co-authored-by: jrfnl <jrfnl@users.noreply.github.com>

Author: jrfnl

.github/workflows/test.yml

@@ -147,8 +147,8 @@ jobs:
 
       - name: 'Composer: adjust dependencies'
         run: |
-          # Remove dev dependencies which are not compatible with all supported PHP versions.
-          composer remove --dev --no-update sirbrillig/phpcs-import-detection phpstan/phpstan
+          # Remove dev dependencies which are not compatible with all supported PHP/PHPCS versions.
+          composer remove --dev --no-update phpcsstandards/phpcsdevcs sirbrillig/phpcs-import-detection phpstan/phpstan
           composer require --no-update squizlabs/php_codesniffer:"${{ matrix.phpcs_version }}"
 
       - name: Install Composer dependencies

Tests/BaseTestCase.php

@@ -1,4 +1,5 @@
 <?php
+
 namespace VariableAnalysis\Tests;
 
 use PHPUnit\Framework\TestCase;

Tests/VariableAnalysisSniff/ArrayAssignmentShortcutTest.php

@@ -1,4 +1,5 @@
 <?php
+
 namespace VariableAnalysis\Tests\VariableAnalysisSniff;
 
 use VariableAnalysis\Tests\BaseTestCase;

Tests/VariableAnalysisSniff/ArrowFunctionTest.php

@@ -1,4 +1,5 @@
 <?php
+
 namespace VariableAnalysis\Tests\VariableAnalysisSniff;
 
 use VariableAnalysis\Tests\BaseTestCase;

Tests/VariableAnalysisSniff/ClosingPhpTagsTest.php

@@ -1,4 +1,5 @@
 <?php
+
 namespace VariableAnalysis\Tests\VariableAnalysisSniff;
 
 use VariableAnalysis\Tests\BaseTestCase;

Tests/VariableAnalysisSniff/GlobalScopeTest.php

@@ -1,4 +1,5 @@
 <?php
+
 namespace VariableAnalysis\Tests\VariableAnalysisSniff;
 
 use VariableAnalysis\Tests\BaseTestCase;

Tests/VariableAnalysisSniff/IfConditionTest.php

@@ -1,4 +1,5 @@
 <?php
+
 namespace VariableAnalysis\Tests\VariableAnalysisSniff;
 
 use VariableAnalysis\Tests\BaseTestCase;

Tests/VariableAnalysisSniff/IssetTest.php

@@ -1,4 +1,5 @@
 <?php
+
 namespace VariableAnalysis\Tests\VariableAnalysisSniff;
 
 use VariableAnalysis\Tests\BaseTestCase;

Tests/VariableAnalysisSniff/UnsetTest.php

@@ -1,4 +1,5 @@
 <?php
+
 namespace VariableAnalysis\Tests\VariableAnalysisSniff;
 
 use VariableAnalysis\Tests\BaseTestCase;

Tests/VariableAnalysisSniff/UnusedFollowedByRequireTest.php

@@ -1,4 +1,5 @@
 <?php
+
 namespace VariableAnalysis\Tests\VariableAnalysisSniff;
 
 use VariableAnalysis\Tests\BaseTestCase;