From 5a989395a4318475590c6515512f17e2b8e4df8f Mon Sep 17 00:00:00 2001
From: Greg Sherwood <gsherwood@squiz.net>
Date: Thu, 19 Apr 2018 11:59:29 +1000
Subject: [PATCH] Added new Generic.PHP.LowerCaseType sniff to ensure PHP types
 used for type hints, return types, and type casting are lowercase

---
 package.xml                                   |   7 +
 .../Docs/PHP/LowerCaseTypeStandard.xml        |  38 +++++
 .../Generic/Sniffs/PHP/LowerCaseTypeSniff.php | 148 ++++++++++++++++++
 .../Tests/PHP/LowerCaseTypeUnitTest.inc       |  29 ++++
 .../Tests/PHP/LowerCaseTypeUnitTest.inc.fixed |  29 ++++
 .../Tests/PHP/LowerCaseTypeUnitTest.php       |  60 +++++++
 6 files changed, 311 insertions(+)
 create mode 100644 src/Standards/Generic/Docs/PHP/LowerCaseTypeStandard.xml
 create mode 100644 src/Standards/Generic/Sniffs/PHP/LowerCaseTypeSniff.php
 create mode 100644 src/Standards/Generic/Tests/PHP/LowerCaseTypeUnitTest.inc
 create mode 100644 src/Standards/Generic/Tests/PHP/LowerCaseTypeUnitTest.inc.fixed
 create mode 100644 src/Standards/Generic/Tests/PHP/LowerCaseTypeUnitTest.php

diff --git a/package.xml b/package.xml
index 730f946467..10472737f7 100644
--- a/package.xml
+++ b/package.xml
@@ -99,6 +99,8 @@ http://pear.php.net/dtd/package-2.0.xsd">
     -- Functionality of the Squiz standard remains the same, but the error codes are now different
     -- Previously, Squiz.PHP.ForbiddenFunctions.Found and Squiz.PHP.ForbiddenFunctions.FoundWithAlternative
     -- Now, Generic.PHP.ForbiddenFunctions.Found and Generic.PHP.ForbiddenFunctions.FoundWithAlternative
+  - Added new Generic.PHP.LowerCaseType sniff
+    -- Ensures PHP types used for type hints, return types, and type casting are lowercase
   - Added new Generic.WhiteSpace.ArbitraryParenthesesSpacing sniff
     -- Generates an error for whitespace inside parenthesis that don't belong to a function call/declaration or control structure
     -- Generates a warning for any empty parenthesis found
@@ -391,6 +393,7 @@ http://pear.php.net/dtd/package-2.0.xsd">
         <file baseinstalldir="PHP/CodeSniffer" name="ForbiddenFunctionsStandard.xml" role="php" />
         <file baseinstalldir="PHP/CodeSniffer" name="LowerCaseConstantStandard.xml" role="php" />
         <file baseinstalldir="PHP/CodeSniffer" name="LowerCaseKeywordStandard.xml" role="php" />
+        <file baseinstalldir="PHP/CodeSniffer" name="LowerCaseTypeStandard.xml" role="php" />
         <file baseinstalldir="PHP/CodeSniffer" name="NoSilencedErrorsStandard.xml" role="php" />
         <file baseinstalldir="PHP/CodeSniffer" name="SAPIUsageStandard.xml" role="php" />
         <file baseinstalldir="PHP/CodeSniffer" name="UpperCaseConstantStandard.xml" role="php" />
@@ -489,6 +492,7 @@ http://pear.php.net/dtd/package-2.0.xsd">
         <file baseinstalldir="PHP/CodeSniffer" name="ForbiddenFunctionsSniff.php" role="php" />
         <file baseinstalldir="PHP/CodeSniffer" name="LowerCaseConstantSniff.php" role="php" />
         <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="SAPIUsageSniff.php" role="php" />
         <file baseinstalldir="PHP/CodeSniffer" name="SyntaxSniff.php" role="php" />
@@ -705,6 +709,9 @@ http://pear.php.net/dtd/package-2.0.xsd">
         <file baseinstalldir="PHP/CodeSniffer" name="LowerCaseKeywordUnitTest.inc" role="test" />
         <file baseinstalldir="PHP/CodeSniffer" name="LowerCaseKeywordUnitTest.inc.fixed" role="test" />
         <file baseinstalldir="PHP/CodeSniffer" name="LowerCaseKeywordUnitTest.php" role="test" />
+        <file baseinstalldir="PHP/CodeSniffer" name="LowerCaseTypeUnitTest.inc" role="test" />
+        <file baseinstalldir="PHP/CodeSniffer" name="LowerCaseTypeUnitTest.inc.fixed" role="test" />
+        <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="SAPIUsageUnitTest.inc" role="test" />
diff --git a/src/Standards/Generic/Docs/PHP/LowerCaseTypeStandard.xml b/src/Standards/Generic/Docs/PHP/LowerCaseTypeStandard.xml
new file mode 100644
index 0000000000..61c8d5396f
--- /dev/null
+++ b/src/Standards/Generic/Docs/PHP/LowerCaseTypeStandard.xml
@@ -0,0 +1,38 @@
+<documentation title="Lowercase PHP Types">
+    <standard>
+    <![CDATA[
+    All PHP types used for type hints and return types should be lowercase.
+    ]]>
+    </standard>
+    <code_comparison>
+        <code title="Valid: Lowercase types used.">
+        <![CDATA[
+function myFunction(int $foo) : string {
+}
+        ]]>
+        </code>
+        <code title="Invalid: Non-lowercase types used.">
+        <![CDATA[
+function myFunction(<em>Int</em> $foo) : <em>STRING</em> {
+}
+        ]]>
+        </code>
+    </code_comparison>
+    <standard>
+    <![CDATA[
+    All PHP types used for type casting should be lowercase.
+    ]]>
+    </standard>
+    <code_comparison>
+        <code title="Valid: Lowercase type used.">
+        <![CDATA[
+$foo = (bool) $isValid;
+        ]]>
+        </code>
+        <code title="Invalid: Non-lowercase type used.">
+        <![CDATA[
+$foo = <em>(BOOL)</em> $isValid;
+        ]]>
+        </code>
+    </code_comparison>
+</documentation>
diff --git a/src/Standards/Generic/Sniffs/PHP/LowerCaseTypeSniff.php b/src/Standards/Generic/Sniffs/PHP/LowerCaseTypeSniff.php
new file mode 100644
index 0000000000..feaa6dd183
--- /dev/null
+++ b/src/Standards/Generic/Sniffs/PHP/LowerCaseTypeSniff.php
@@ -0,0 +1,148 @@
+<?php
+/**
+ * Checks that all PHP types are lowercase.
+ *
+ * @author    Greg Sherwood <gsherwood@squiz.net>
+ * @copyright 2006-2015 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;
+use PHP_CodeSniffer\Util\Tokens;
+
+class LowerCaseTypeSniff implements Sniff
+{
+
+
+    /**
+     * Returns an array of tokens this test wants to listen for.
+     *
+     * @return array
+     */
+    public function register()
+    {
+        $tokens   = Tokens::$castTokens;
+        $tokens[] = T_FUNCTION;
+        $tokens[] = T_CLOSURE;
+        return $tokens;
+
+    }//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 void
+     */
+    public function process(File $phpcsFile, $stackPtr)
+    {
+        $tokens  = $phpcsFile->getTokens();
+
+        if (isset(Tokens::$castTokens[$tokens[$stackPtr]['code']]) === true) {
+            // A cast token.
+            if (strtolower($tokens[$stackPtr]['content']) !== $tokens[$stackPtr]['content']) {
+                if ($tokens[$stackPtr]['content'] === strtoupper($tokens[$stackPtr]['content'])) {
+                    $phpcsFile->recordMetric($stackPtr, 'PHP type case', 'upper');
+                } else {
+                    $phpcsFile->recordMetric($stackPtr, 'PHP type case', 'mixed');
+                }
+
+                $error = 'PHP types must be lowercase; expected "%s" but found "%s"';
+                $data  = [
+                    strtolower($tokens[$stackPtr]['content']),
+                    $tokens[$stackPtr]['content'],
+                ];
+
+                $fix = $phpcsFile->addFixableError($error, $stackPtr, 'Found', $data);
+                if ($fix === true) {
+                    $phpcsFile->fixer->replaceToken($stackPtr, strtolower($tokens[$stackPtr]['content']));
+                }
+            } else {
+                $phpcsFile->recordMetric($stackPtr, 'PHP type case', 'lower');
+            }//end if
+
+            return;
+        }
+
+        $phpTypes = [
+            'self'     => true,
+            'array'    => true,
+            'callable' => true,
+            'bool'     => true,
+            'float'    => true,
+            'int'      => true,
+            'string'   => true,
+            'iterable' => true,
+        ];
+
+        $props      = $phpcsFile->getMethodProperties($stackPtr);
+        $returnType = $props['return_type'];
+        if ($returnType !== ''
+            && isset($phpTypes[strtolower($returnType)]) === true
+        ) {
+            // A function return type.
+            if (strtolower($returnType) !== $returnType) {
+                if ($returnType === strtoupper($returnType)) {
+                    $phpcsFile->recordMetric($stackPtr, 'PHP type case', 'upper');
+                } else {
+                    $phpcsFile->recordMetric($stackPtr, 'PHP type case', 'mixed');
+                }
+
+                $error = 'PHP types must be lowercase; expected "%s" but found "%s"';
+                $data  = [
+                    strtolower($returnType),
+                    $returnType,
+                ];
+
+                $fix = $phpcsFile->addFixableError($error, $stackPtr, 'Found', $data);
+                if ($fix === true) {
+                    $token = $props['return_type_token'];
+                    $phpcsFile->fixer->replaceToken($token, strtolower($tokens[$token]['content']));
+                }
+            } else {
+                $phpcsFile->recordMetric($stackPtr, 'PHP type case', 'lower');
+            }//end if
+        }
+
+        $params = $phpcsFile->getMethodParameters($stackPtr);
+        foreach ($params as $param) {
+            $typeHint = $param['type_hint'];
+            if ($typeHint !== ''
+                && isset($phpTypes[strtolower($typeHint)]) === true
+            ) {
+                // A function return type.
+                if (strtolower($typeHint) !== $typeHint) {
+                    if ($typeHint === strtoupper($typeHint)) {
+                        $phpcsFile->recordMetric($stackPtr, 'PHP type case', 'upper');
+                    } else {
+                        $phpcsFile->recordMetric($stackPtr, 'PHP type case', 'mixed');
+                    }
+
+                    $error = 'PHP types must be lowercase; expected "%s" but found "%s"';
+                    $data  = [
+                        strtolower($typeHint),
+                        $typeHint,
+                    ];
+
+                    $fix = $phpcsFile->addFixableError($error, $stackPtr, 'Found', $data);
+                    if ($fix === true) {
+                        $token = $param['type_hint_token'];
+                        $phpcsFile->fixer->replaceToken($token, strtolower($tokens[$token]['content']));
+                    }
+                } else {
+                    $phpcsFile->recordMetric($stackPtr, 'PHP type case', 'lower');
+                }//end if
+            }
+        }
+
+    }//end process()
+
+
+}//end class
diff --git a/src/Standards/Generic/Tests/PHP/LowerCaseTypeUnitTest.inc b/src/Standards/Generic/Tests/PHP/LowerCaseTypeUnitTest.inc
new file mode 100644
index 0000000000..3ed2e99c46
--- /dev/null
+++ b/src/Standards/Generic/Tests/PHP/LowerCaseTypeUnitTest.inc
@@ -0,0 +1,29 @@
+<?php
+$foo = (int) $bar;
+$foo = (integer) $bar;
+$foo = (bool) $bar;
+$foo = (boolean) $bar;
+$foo = (float) $bar;
+$foo = (double) $bar;
+$foo = (real) $bar;
+$foo = (string) $bar;
+$foo = (array) $bar;
+$foo = (object) $bar;
+$foo = (unset) $bar;
+
+$foo = (Int) $bar;
+$foo = (INTEGER) $bar;
+$foo = (BOOL) $bar;
+$foo = (String) $bar;
+$foo = (Array) $bar;
+
+function foo(int $a, string $b, bool $c, array $d, Foo\Bar $e) : int {}
+function foo(Int $a, String $b, BOOL $c, Array $d, Foo\Bar $e) : Foo\Bar {}
+function foo(Int $a, Bar $b, BOOL $c, Array $d, Foo\Bar $e) : Bar {}
+function foo(callable $a, Callable $b, self $c, Iterable $d, iterable $e) : Float {}
+
+$foo = function (int $a, Bool $b) {};
+$foo = function (int $a, Callable $b) :INT{};
+$foo = function (BOOL $a, float $b) use ($foo) : INT {};
+$foo = function (Foo $a, Foo\Bar $b) use ($foo) : \Foo\Bar {};
+$foo = function (bool $a, callable $b) use ($foo) : Bar {};
diff --git a/src/Standards/Generic/Tests/PHP/LowerCaseTypeUnitTest.inc.fixed b/src/Standards/Generic/Tests/PHP/LowerCaseTypeUnitTest.inc.fixed
new file mode 100644
index 0000000000..99ec783e54
--- /dev/null
+++ b/src/Standards/Generic/Tests/PHP/LowerCaseTypeUnitTest.inc.fixed
@@ -0,0 +1,29 @@
+<?php
+$foo = (int) $bar;
+$foo = (integer) $bar;
+$foo = (bool) $bar;
+$foo = (boolean) $bar;
+$foo = (float) $bar;
+$foo = (double) $bar;
+$foo = (real) $bar;
+$foo = (string) $bar;
+$foo = (array) $bar;
+$foo = (object) $bar;
+$foo = (unset) $bar;
+
+$foo = (int) $bar;
+$foo = (integer) $bar;
+$foo = (bool) $bar;
+$foo = (string) $bar;
+$foo = (array) $bar;
+
+function foo(int $a, string $b, bool $c, array $d, Foo\Bar $e) : int {}
+function foo(int $a, string $b, bool $c, array $d, Foo\Bar $e) : Foo\Bar {}
+function foo(int $a, Bar $b, bool $c, array $d, Foo\Bar $e) : Bar {}
+function foo(callable $a, callable $b, self $c, iterable $d, iterable $e) : float {}
+
+$foo = function (int $a, bool $b) {};
+$foo = function (int $a, callable $b) :int{};
+$foo = function (bool $a, float $b) use ($foo) : int {};
+$foo = function (Foo $a, Foo\Bar $b) use ($foo) : \Foo\Bar {};
+$foo = function (bool $a, callable $b) use ($foo) : Bar {};
diff --git a/src/Standards/Generic/Tests/PHP/LowerCaseTypeUnitTest.php b/src/Standards/Generic/Tests/PHP/LowerCaseTypeUnitTest.php
new file mode 100644
index 0000000000..5d12af93bd
--- /dev/null
+++ b/src/Standards/Generic/Tests/PHP/LowerCaseTypeUnitTest.php
@@ -0,0 +1,60 @@
+<?php
+/**
+ * Unit test class for the LowerCaseType sniff.
+ *
+ * @author    Greg Sherwood <gsherwood@squiz.net>
+ * @copyright 2006-2015 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 LowerCaseTypeUnitTest 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.
+     *
+     * @return array<int, int>
+     */
+    public function getErrorList()
+    {
+        return [
+            14 => 1,
+            15 => 1,
+            16 => 1,
+            17 => 1,
+            18 => 1,
+            21 => 4,
+            22 => 3,
+            23 => 3,
+            25 => 1,
+            26 => 2,
+            27 => 2,
+        ];
+
+    }//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