Feature: Allow valid continues statements inside switch

Travelopia-WordPress/Sniffs/PHP/PreferBreakInsideSwitchOnlySniff.php

@@ -0,0 +1,72 @@
+<?php
+/**
+ * Sniff: PreferBreakInsideSwitchOnlySniff.
+ *
+ * @package travelopia-coding-standards
+ */
+
+namespace Travelopia\Sniffs\PHP;
+
+use PHP_CodeSniffer\Sniffs\Sniff;
+use PHP_CodeSniffer\Files\File;
+
+/**
+ * Sniff to check if only break is used inside a switch case, and not continue.
+ */
+class PreferBreakInsideSwitchOnlySniff implements Sniff {
+
+	/**
+	 * Register the sniff.
+	 *
+	 * @return mixed[]
+	 */
+	public function register(): array {
+		return [ T_CASE ];
+	}
+
+	/**
+	 * Process the sniff.
+	 *
+	 * @param File $phpcsFile The file being processed.
+	 * @param int  $stackPtr  Stack pointer.
+	 *
+	 * @return void
+	 */
+	public function process( File $phpcsFile, $stackPtr ): void {
+		// Get tokens.
+		$tokens = $phpcsFile->getTokens();
+
+		// Set Start and End pointers.
+		$searchStartPtr = $stackPtr + 1;
+		$caseEndPtr     = $tokens[ $stackPtr ]['scope_closer'];
+
+		// Search for continue inside the case.
+		do {
+			// Find the next continue.
+			$continuePtr = $phpcsFile->findNext( T_CONTINUE, $searchStartPtr, $caseEndPtr + 1 );
+
+			// If continue is inside a loop, ignore it.
+			if ( false !== $continuePtr ) {
+				// Search for the loop in which the continue is present.
+				$loopStartPtr = $phpcsFile->findPrevious( [ T_WHILE, T_FOR, T_FOREACH, T_DO ], $continuePtr, $stackPtr );
+				$loopEndPtr   = $tokens[ $loopStartPtr ]['scope_closer'];
+
+				// If the continue is inside a loop, ignore it.
+				if ( $loopStartPtr && $continuePtr > $loopStartPtr && $continuePtr < $loopEndPtr ) {
+					$searchStartPtr = $loopEndPtr + 1;
+					continue;
+				}
+
+				// Display warning.
+				$phpcsFile->addWarningOnLine(
+					'Use `break` or `continue x` where x is the nesting level to break out of the switch.',
+					$tokens[ $continuePtr ]['line'],
+					'UseBreakInsideSwitch'
+				);
+
+				// Set the search pointer to the next token.
+				$searchStartPtr = $continuePtr + 1;
+			}
+		} while ( false !== $continuePtr );
+	}
+}