2 files changed, 209 insertions, 0 deletions
diff --git a/build/code_sniffer/phpbb/Sniffs/Namespaces/UnusedUseSniff.php b/build/code_sniffer/phpbb/Sniffs/Namespaces/UnusedUseSniff.php
new file mode 100644
index 0000000000..dad384d855
--- /dev/null
+++ b/build/code_sniffer/phpbb/Sniffs/Namespaces/UnusedUseSniff.php
@@ -0,0 +1,206 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+/**
+* Checks that each use statement is used.
+*/
+class phpbb_Sniffs_Namespaces_UnusedUseSniff implements PHP_CodeSniffer_Sniff
+{
+	/**
+	* {@inheritdoc}
+	*/
+	public function register()
+	{
+		return array(T_USE);
+	}
+
+	/**
+	* {@inheritdoc}
+	*/
+	public function process(PHP_CodeSniffer_File $phpcsFile, $stackPtr)
+	{
+		if ($this->should_ignore_use($phpcsFile, $stackPtr) === true) {
+			return;
+		}
+
+		$tokens = $phpcsFile->getTokens();
+
+		$class_name_start = $phpcsFile->findNext(array(T_NS_SEPARATOR, T_STRING), ($stackPtr + 1));
+
+		$find = array(
+			T_NS_SEPARATOR,
+			T_STRING,
+			T_WHITESPACE,
+		);
+
+		$class_name_end = $phpcsFile->findNext($find, ($stackPtr + 1), null, true);
+
+		$aliasing_as_position = $phpcsFile->findNext(T_AS, $class_name_end, null, false, null, true);
+		if ($aliasing_as_position !== false)
+		{
+			$alias_position = $phpcsFile->findNext(T_STRING, $aliasing_as_position, null, false, null, true);
+			$class_name_short = $tokens[$alias_position]['content'];
+			$class_name_full = $phpcsFile->getTokensAsString($class_name_start, ($class_name_end - $class_name_start - 1));
+		}
+		else
+		{
+			$class_name_full = $phpcsFile->getTokensAsString($class_name_start, ($class_name_end - $class_name_start));
+			$class_name_short = $tokens[$class_name_end - 1]['content'];
+		}
+
+		$ok = false;
+
+		// Checks in simple statements (new, instanceof and extends)
+		foreach (array(T_INSTANCEOF, T_NEW, T_EXTENDS) as $keyword)
+		{
+			$old_simple_statement = $stackPtr;
+			while (($simple_statement = $phpcsFile->findNext($keyword, ($old_simple_statement + 1))) !== false)
+			{
+				$old_simple_statement = $simple_statement;
+
+				$simple_class_name_start = $phpcsFile->findNext(array(T_NS_SEPARATOR, T_STRING), ($simple_statement + 1));
+				$simple_class_name_end = $phpcsFile->findNext($find, ($simple_statement + 1), null, true);
+
+				$simple_class_name = trim($phpcsFile->getTokensAsString($simple_class_name_start, ($simple_class_name_end - $simple_class_name_start)));
+
+				if ($simple_class_name === $class_name_full)
+				{
+					$error = 'Either use statement or full name must be used.';
+					$phpcsFile->addError($error, $simple_statement, 'FullName');
+				}
+
+				if ($simple_class_name === $class_name_short)
+				{
+					$ok = true;
+				}
+			}
+		}
+
+		// Checks paamayim nekudotayim
+		$old_paamayim_nekudotayim = $stackPtr;
+		while (($paamayim_nekudotayim = $phpcsFile->findNext(T_PAAMAYIM_NEKUDOTAYIM, ($old_paamayim_nekudotayim + 1))) !== false)
+		{
+			$old_paamayim_nekudotayim = $paamayim_nekudotayim;
+
+			$paamayim_nekudotayim_class_name_start = $phpcsFile->findPrevious($find, $paamayim_nekudotayim - 1, null, true);
+			$paamayim_nekudotayim_class_name_end = $paamayim_nekudotayim - 1;
+
+			$paamayim_nekudotayim_class_name = trim($phpcsFile->getTokensAsString($paamayim_nekudotayim_class_name_start + 1, ($paamayim_nekudotayim_class_name_end - $paamayim_nekudotayim_class_name_start)));
+
+			if ($paamayim_nekudotayim_class_name === $class_name_full)
+			{
+				$error = 'Either use statement or full name must be used.';
+				$phpcsFile->addError($error, $paamayim_nekudotayim, 'FullName');
+			}
+
+			if ($paamayim_nekudotayim_class_name === $class_name_short)
+			{
+				$ok = true;
+			}
+		}
+		
+		// Checks in implements
+		$old_implements = $stackPtr;
+		while (($implements = $phpcsFile->findNext(T_IMPLEMENTS, ($old_implements + 1))) !== false)
+		{
+			$old_implements = $implements;
+
+			$old_implemented_class = $implements;
+			while (($implemented_class = $phpcsFile->findNext(T_STRING, ($old_implemented_class + 1), null, false, null, true)) !== false)
+			{
+				$old_implemented_class = $implemented_class;
+
+				$implements_class_name_start = $phpcsFile->findNext(array(T_NS_SEPARATOR, T_STRING), ($implemented_class - 1));
+				$implements_class_name_end = $phpcsFile->findNext($find, ($implemented_class - 1), null, true);
+
+				$implements_class_name = trim($phpcsFile->getTokensAsString($implements_class_name_start, ($implements_class_name_end - $implements_class_name_start)));
+
+				if ($implements_class_name === $class_name_full)
+				{
+					$error = 'Either use statement or full name must be used.';
+					$phpcsFile->addError($error, $implements, 'FullName');
+				}
+
+				if ($implements_class_name === $class_name_short)
+				{
+					$ok = true;
+				}
+			}
+		}
+
+		// Checks in type hinting
+		$old_function_declaration = $stackPtr;
+		while (($function_declaration = $phpcsFile->findNext(T_FUNCTION, ($old_function_declaration + 1))) !== false)
+		{
+			$old_function_declaration = $function_declaration;
+
+			$end_function = $phpcsFile->findNext(array(T_CLOSE_PARENTHESIS), ($function_declaration + 1));
+			$old_argument = $function_declaration;
+			while (($argument = $phpcsFile->findNext(T_VARIABLE, ($old_argument + 1), $end_function)) !== false)
+			{
+				$old_argument = $argument;
+
+				$start_argument = $phpcsFile->findPrevious(array(T_OPEN_PARENTHESIS, T_COMMA), $argument);
+				$argument_class_name_start = $phpcsFile->findNext(array(T_NS_SEPARATOR, T_STRING), ($start_argument + 1), $argument);
+				$argument_class_name_end = $phpcsFile->findNext($find, ($argument_class_name_start + 1), null, true);
+
+				$argument_class_name = $phpcsFile->getTokensAsString($argument_class_name_start, ($argument_class_name_end - $argument_class_name_start - 1));
+
+				if ($argument_class_name === $class_name_full)
+				{
+					$error = 'Either use statement or full name must be used.';
+					$phpcsFile->addError($error, $function_declaration, 'FullName');
+				}
+
+				if ($argument_class_name === $class_name_short)
+				{
+					$ok = true;
+				}
+			}
+		}
+
+		if (!$ok)
+		{
+			$error = 'There must not be unused USE statement.';
+			$phpcsFile->addError($error, $stackPtr, 'Unused');
+		}
+	}
+
+	/**
+	* Check if this use statement is part of the namespace block.
+	*
+	* @param PHP_CodeSniffer_File $phpcsFile The file being scanned.
+	* @param int                  $stackPtr  The position of the current token in
+	*                                        the stack passed in $tokens.
+	*
+	* @return bool
+	*/
+	private function should_ignore_use(PHP_CodeSniffer_File $phpcsFile, $stackPtr)
+	{
+		$tokens = $phpcsFile->getTokens();
+
+		// Ignore USE keywords inside closures.
+		$next = $phpcsFile->findNext(T_WHITESPACE, ($stackPtr + 1), null, true);
+		if ($tokens[$next]['code'] === T_OPEN_PARENTHESIS) {
+			return true;
+		}
+
+		// Ignore USE keywords for traits.
+		if ($phpcsFile->hasCondition($stackPtr, array(T_CLASS, T_TRAIT)) === true) {
+			return true;
+		}
+
+		return false;
+
+	}
+}
diff --git a/build/code_sniffer/ruleset-php-strict.xml b/build/code_sniffer/ruleset-php-strict.xml
index 59db73dec4..9e2f0664d8 100644
--- a/build/code_sniffer/ruleset-php-strict.xml
+++ b/build/code_sniffer/ruleset-php-strict.xml
@@ -42,4 +42,7 @@
  <!-- There MUST be one blank line after the namespace declaration -->
  <rule ref="PSR2.Namespaces.NamespaceDeclaration" />
 
+ <!-- There MUST NOT be unused use statements. -->
+ <rule ref="./phpbb/Sniffs/Namespaces/UnusedUseSniff.php" />
+
 </ruleset>