New sniffs for enforcing require strict types & formatting of declare…

… statements (ref #2365)

package.xml

@@ -402,6 +402,7 @@ http://pear.php.net/dtd/package-2.0.xsd">
         <file baseinstalldir="PHP/CodeSniffer" name="LowerCaseKeywordSniff.php" role="php" />
         <file baseinstalldir="PHP/CodeSniffer" name="LowerCaseTypeSniff.php" role="php" />
         <file baseinstalldir="PHP/CodeSniffer" name="NoSilencedErrorsSniff.php" role="php" />
+        <file baseinstalldir="PHP/CodeSniffer" name="RequireStrictTypesSniff.php" role="php" />
         <file baseinstalldir="PHP/CodeSniffer" name="SAPIUsageSniff.php" role="php" />
         <file baseinstalldir="PHP/CodeSniffer" name="SyntaxSniff.php" role="php" />
         <file baseinstalldir="PHP/CodeSniffer" name="UpperCaseConstantSniff.php" role="php" />
@@ -670,6 +671,9 @@ http://pear.php.net/dtd/package-2.0.xsd">
         <file baseinstalldir="PHP/CodeSniffer" name="LowerCaseTypeUnitTest.php" role="test" />
         <file baseinstalldir="PHP/CodeSniffer" name="NoSilencedErrorsUnitTest.inc" role="test" />
         <file baseinstalldir="PHP/CodeSniffer" name="NoSilencedErrorsUnitTest.php" role="test" />
+        <file baseinstalldir="PHP/CodeSniffer" name="RequireStrictTypesUnitTest.1.inc" role="test" />
+        <file baseinstalldir="PHP/CodeSniffer" name="RequireStrictTypesUnitTest.2.inc" role="test" />
+        <file baseinstalldir="PHP/CodeSniffer" name="RequireStrictTypesUnitTest.php" role="test" />
         <file baseinstalldir="PHP/CodeSniffer" name="SAPIUsageUnitTest.inc" role="test" />
         <file baseinstalldir="PHP/CodeSniffer" name="SAPIUsageUnitTest.php" role="test" />
         <file baseinstalldir="PHP/CodeSniffer" name="SyntaxUnitTest.inc" role="test" />
@@ -1039,6 +1043,9 @@ http://pear.php.net/dtd/package-2.0.xsd">
        <dir name="Classes">
         <file baseinstalldir="PHP/CodeSniffer" name="ClassInstantiationSniff.php" role="php" />
        </dir>
+       <dir name="Files">
+        <file baseinstalldir="PHP/CodeSniffer" name="DeclareStatementSniff.php" role="php" />
+       </dir>
        <dir name="Functions">
         <file baseinstalldir="PHP/CodeSniffer" name="NullableTypeDeclarationSniff.php" role="php" />
        </dir>
@@ -1058,6 +1065,11 @@ http://pear.php.net/dtd/package-2.0.xsd">
         <file baseinstalldir="PHP/CodeSniffer" name="ClassInstantiationUnitTest.inc.fixed" role="test" />
         <file baseinstalldir="PHP/CodeSniffer" name="ClassInstantiationUnitTest.php" role="test" />
        </dir>
+       <dir name="Files">
+        <file baseinstalldir="PHP/CodeSniffer" name="DeclareStatementUnitTest.inc" role="test" />
+        <file baseinstalldir="PHP/CodeSniffer" name="DeclareStatementUnitTest.inc.fixed" role="test" />
+        <file baseinstalldir="PHP/CodeSniffer" name="DeclareStatementUnitTest.php" role="test" />
+       </dir>
        <dir name="Functions">
         <file baseinstalldir="PHP/CodeSniffer" name="NullableTypeDeclarationUnitTest.inc" role="test" />
         <file baseinstalldir="PHP/CodeSniffer" name="NullableTypeDeclarationUnitTest.inc.fixed" role="test" />

src/Standards/Generic/Sniffs/PHP/RequireStrictTypesSniff.php

@@ -0,0 +1,69 @@
+<?php
+/**
+ * Checks that the strict_types has been declared.
+ *
+ * @author    Sertan Danis <sdanis@squiz.net>
+ * @copyright 2006-2019 Squiz Pty Ltd (ABN 77 084 670 600)
+ * @license   https://github.com/squizlabs/PHP_CodeSniffer/blob/master/licence.txt BSD Licence
+ */
+
+namespace PHP_CodeSniffer\Standards\Generic\Sniffs\PHP;
+
+use PHP_CodeSniffer\Sniffs\Sniff;
+use PHP_CodeSniffer\Files\File;
+
+class RequireStrictTypesSniff implements Sniff
+{
+
+
+    /**
+     * Returns an array of tokens this test wants to listen for.
+     *
+     * @return array
+     */
+    public function register()
+    {
+        return [T_OPEN_TAG];
+
+    }//end register()
+
+
+    /**
+     * Processes this sniff, when one of its tokens is encountered.
+     *
+     * @param \PHP_CodeSniffer\Files\File $phpcsFile The file being scanned.
+     * @param int                         $stackPtr  The position of the current token in
+     *                                               the stack passed in $tokens.
+     *
+     * @return int
+     */
+    public function process(File $phpcsFile, $stackPtr)
+    {
+        $tokens  = $phpcsFile->getTokens();
+        $declare = $phpcsFile->findNext(T_DECLARE, $stackPtr);
+        $found   = false;
+
+        if ($declare !== false) {
+            $nextString = $phpcsFile->findNext(T_STRING, $declare);
+
+            if ($nextString !== false) {
+                if (strtolower($tokens[$nextString]['content']) === 'strict_types') {
+                    // There is a strict types declaration.
+                    $found = true;
+                }
+            }
+        }
+
+        if ($found === false) {
+            $error = 'Missing required strict_types declaration';
+            $phpcsFile->addError($error, $stackPtr, 'MissingDeclaration');
+        }
+
+        // Skip the rest of the file so we don't pick up additional
+        // open tags, typically embedded in HTML.
+        return $phpcsFile->numTokens;
+
+    }//end process()
+
+
+}//end class

src/Standards/Generic/Tests/PHP/RequireStrictTypesUnitTest.1.inc

@@ -0,0 +1,8 @@
+<?php
+
+
+declare(strict_types=1);
+
+declare(ticks=1) {
+    // some code
+}

src/Standards/Generic/Tests/PHP/RequireStrictTypesUnitTest.2.inc

@@ -0,0 +1,2 @@
+<?php
+declare(ticks=1);

src/Standards/Generic/Tests/PHP/RequireStrictTypesUnitTest.php

@@ -0,0 +1,56 @@
+<?php
+/**
+ * Unit test class for the RequireStrictType sniff.
+ *
+ * @author    Sertan Danis <sdanis@squiz.net>
+ * @copyright 2006-2019 Squiz Pty Ltd (ABN 77 084 670 600)
+ * @license   https://github.com/squizlabs/PHP_CodeSniffer/blob/master/licence.txt BSD Licence
+ */
+
+namespace PHP_CodeSniffer\Standards\Generic\Tests\PHP;
+
+use PHP_CodeSniffer\Tests\Standards\AbstractSniffUnitTest;
+
+class RequireStrictTypesUnitTest extends AbstractSniffUnitTest
+{
+
+
+    /**
+     * Returns the lines where errors should occur.
+     *
+     * The key of the array should represent the line number and the value
+     * should represent the number of errors that should occur on that line.
+     *
+     * @param string $testFile The name of the file being tested.
+     *
+     * @return array<int, int>
+     */
+    public function getErrorList($testFile='')
+    {
+        switch ($testFile) {
+        case 'RequireStrictTypesUnitTest.1.inc':
+            return [];
+            break;
+        }
+
+        return [1 => 1];
+
+    }//end getErrorList()
+
+
+    /**
+     * Returns the lines where warnings should occur.
+     *
+     * The key of the array should represent the line number and the value
+     * should represent the number of warnings that should occur on that line.
+     *
+     * @return array<int, int>
+     */
+    public function getWarningList()
+    {
+        return [];
+
+    }//end getWarningList()
+
+
+}//end class