Bring back support for PHP 5.3

As Parallel Lint supports PHP 5.3 again since [PR 51](php-parallel-lint/PHP-Parallel-Lint#51), it would be helpful for the Highlighter repo to also support PHP 5.3.

This restores the PHP 5.3 minimum version to the same as before the version drop in 02b6aa6

Author: jrfnl

.github/workflows/test.yml

@@ -12,7 +12,7 @@ jobs:
 
     strategy:
       matrix:
-        php: ['5.4', '5.5', '5.6', '7.0', '7.1', '7.2', '7.3', '7.4', '8.0']
+        php: ['5.3', '5.4', '5.5', '5.6', '7.0', '7.1', '7.2', '7.3', '7.4', '8.0']
         experimental: [false]
 
         include:
@@ -34,6 +34,11 @@ jobs:
           coverage: none
           tools: cs2pr
 
+      # Remove PHPCS as it has a minimum PHP requirements of PHP 5.4 and would block install on PHP 5.3.
+      - name: 'Composer: remove PHPCS'
+        if: ${{ matrix.php < 5.4 }}
+        run: composer remove --dev squizlabs/php_codesniffer --no-update
+
       # Install dependencies and handle caching in one go.
       # @link https://github.com/marketplace/actions/install-composer-dependencies
       - name: Install Composer dependencies - normal

composer.json

@@ -14,7 +14,7 @@
         "psr-4": {"JakubOnderka\\PhpConsoleHighlighter\\": "src/"}
     },
     "require": {
-        "php": ">=5.4.0",
+        "php": ">=5.3.0",
         "ext-tokenizer": "*",
         "php-parallel-lint/php-console-color": "^1.0"
     },

src/Highlighter.php

@@ -168,7 +168,6 @@ private function getTokenType($arrayToken)
             case T_LINE:
             case T_CLASS_C:
             case T_FUNC_C:
-            case T_TRAIT_C:
                 return self::TOKEN_DEFAULT;
 
             case T_COMMENT:
@@ -183,6 +182,12 @@ private function getTokenType($arrayToken)
                 return self::TOKEN_HTML;
         }
 
+        // Traits didn't exist in PHP 5.3 yet, so the trait magic constant needs special casing for PHP >= 5.4.
+        // __TRAIT__ will tokenize as T_STRING in PHP 5.3, so, the end result will be the same cross-version.
+        if (defined('T_TRAIT_C') && $arrayToken[0] === T_TRAIT_C) {
+            return self::TOKEN_DEFAULT;
+        }
+
         // Handle PHP >= 8.0 namespaced name tokens.
         // https://www.php.net/manual/en/migration80.incompatible.php#migration80.incompatible.tokenizer
         if (defined('T_NAME_QUALIFIED') && $arrayToken[0] === T_NAME_QUALIFIED) {