Add sniff to detect @var usage

moodle/Sniffs/Commenting/VariableCommentSniff.php

@@ -0,0 +1,304 @@
+<?php
+
+// This file is part of Moodle - https://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANdTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <https://www.gnu.org/licenses/>.
+
+namespace MoodleHQ\MoodleCS\moodle\Sniffs\Commenting;
+
+use PHP_CodeSniffer\Files\File;
+use PHP_CodeSniffer\Sniffs\AbstractVariableSniff;
+use PHPCSUtils\Utils\ObjectDeclarations;
+
+/**
+ * Parses and verifies the variable doc comment.
+ *
+ * The Sniff is based upon the Squiz Labs version, but it has been modified to accept int, rather than integer.
+ *
+ * @author    Greg Sherwood <gsherwood@squiz.net>
+ * @author Andrew Lyons <andrew@nicols.co.uk>
+ * @copyright 2006-2015 Squiz Pty Ltd (ABN 77 084 670 600)
+ * @license   https://github.com/PHPCSStandards/PHP_CodeSniffer/blob/master/licence.txt BSD Licence
+ */
+class VariableCommentSniff extends AbstractVariableSniff
+{
+    /**
+     * An array of variable types for param/var we will check.
+     *
+     * @var string[]
+     */
+    protected static $allowedTypes = [
+        'array',
+        'bool',
+        'float',
+        'int',
+        'mixed',
+        'object',
+        'string',
+        'resource',
+        'callable',
+    ];
+
+    protected static $ignoredTokens = [
+        T_PUBLIC            => T_PUBLIC,
+        T_PRIVATE           => T_PRIVATE,
+        T_PROTECTED         => T_PROTECTED,
+        T_VAR               => T_VAR,
+        T_STATIC            => T_STATIC,
+        T_READONLY          => T_READONLY,
+        T_WHITESPACE        => T_WHITESPACE,
+        T_STRING            => T_STRING,
+        T_NS_SEPARATOR      => T_NS_SEPARATOR,
+        T_NAMESPACE         => T_NAMESPACE,
+        T_NULLABLE          => T_NULLABLE,
+        T_TYPE_UNION        => T_TYPE_UNION,
+        T_TYPE_INTERSECTION => T_TYPE_INTERSECTION,
+        T_NULL              => T_NULL,
+        T_TRUE              => T_TRUE,
+        T_FALSE             => T_FALSE,
+        T_SELF              => T_SELF,
+        T_PARENT            => T_PARENT,
+    ];
+
+    /**
+     * Called to process class member vars.
+     *
+     * @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 processMemberVar(File $phpcsFile, $stackPtr) {
+        $tokens = $phpcsFile->getTokens();
+        $ignore = self::$ignoredTokens;
+
+        for ($commentEnd = ($stackPtr - 1); $commentEnd >= 0; $commentEnd--) {
+            if (isset($ignore[$tokens[$commentEnd]['code']]) === true) {
+                continue;
+            }
+
+            if (
+                $tokens[$commentEnd]['code'] === T_ATTRIBUTE_END
+                && isset($tokens[$commentEnd]['attribute_opener']) === true
+            ) {
+                $commentEnd = $tokens[$commentEnd]['attribute_opener'];
+                continue;
+            }
+
+            break;
+        }
+
+        if (
+            $commentEnd === false
+            || ($tokens[$commentEnd]['code'] !== T_DOC_COMMENT_CLOSE_TAG
+                && $tokens[$commentEnd]['code'] !== T_COMMENT)
+        ) {
+            $phpcsFile->addError('Missing member variable doc comment', $stackPtr, 'Missing');
+            return;
+        }
+
+        if ($tokens[$commentEnd]['code'] === T_COMMENT) {
+            $phpcsFile->addError('You must use "/**" style comments for a member variable comment', $stackPtr, 'WrongStyle');
+            return;
+        }
+
+        $commentStart = $tokens[$commentEnd]['comment_opener'];
+
+        $foundVar = null;
+        foreach ($tokens[$commentStart]['comment_tags'] as $tag) {
+            if ($tokens[$tag]['content'] === '@var') {
+                if ($foundVar !== null) {
+                    $error = 'Only one @var tag is allowed in a member variable comment';
+                    $phpcsFile->addError($error, $tag, 'DuplicateVar');
+                } else {
+                    $foundVar = $tag;
+                }
+            } elseif ($tokens[$tag]['content'] === '@see') {
+                // Make sure the tag isn't empty.
+                $string = $phpcsFile->findNext(T_DOC_COMMENT_STRING, $tag, $commentEnd);
+                if ($string === false || $tokens[$string]['line'] !== $tokens[$tag]['line']) {
+                    $error = 'Content missing for @see tag in member variable comment';
+                    $phpcsFile->addError($error, $tag, 'EmptySees');
+                }
+            } else {
+                $error = '%s tag is not allowed in member variable comment';
+                $data = [$tokens[$tag]['content']];
+                $phpcsFile->addWarning($error, $tag, 'TagNotAllowed', $data);
+            }
+        }
+
+        // The @var tag is the only one we require.
+        if ($foundVar === null) {
+            $error = 'Missing @var tag in member variable comment';
+            $phpcsFile->addError($error, $commentEnd, 'MissingVar');
+            return;
+        }
+
+        $firstTag = $tokens[$commentStart]['comment_tags'][0];
+        if ($foundVar !== null && $tokens[$firstTag]['content'] !== '@var') {
+            $error = 'The @var tag must be the first tag in a member variable comment';
+            $phpcsFile->addError($error, $foundVar, 'VarOrder');
+        }
+
+        // Make sure the tag isn't empty and has the correct padding.
+        $string = $phpcsFile->findNext(T_DOC_COMMENT_STRING, $foundVar, $commentEnd);
+        if ($string === false || $tokens[$string]['line'] !== $tokens[$foundVar]['line']) {
+            $error = 'Content missing for @var tag in member variable comment';
+            $phpcsFile->addError($error, $foundVar, 'EmptyVar');
+            return;
+        }
+
+        // Support both a var type and a description.
+        preg_match('`^((?:\|?(?:array\([^\)]*\)|[\\\\a-z0-9\[\]]+))*)( .*)?`i', $tokens[($foundVar + 2)]['content'], $varParts);
+        $varType = $varParts[1];
+
+        // Check var type (can be multiple, separated by '|').
+        $typeNames = explode('|', $varType);
+        $suggestedNames = [];
+        foreach ($typeNames as $i => $typeName) {
+            $suggestedName = self::suggestType($typeName);
+            if (in_array($suggestedName, $suggestedNames, true) === false) {
+                $suggestedNames[] = $suggestedName;
+            }
+        }
+
+        $suggestedType = implode('|', $suggestedNames);
+        if ($varType !== $suggestedType) {
+            $error = 'Expected "%s" but found "%s" for @var tag in member variable comment';
+            $data = [
+                $suggestedType,
+                $varType,
+            ];
+
+            $fix = $phpcsFile->addFixableError($error, $foundVar, 'IncorrectVarType', $data);
+            if ($fix === true) {
+                $replacement = $suggestedType;
+                if (empty($varParts[2]) === false) {
+                    $replacement .= $varParts[2];
+                }
+
+                $phpcsFile->fixer->replaceToken(($foundVar + 2), $replacement);
+                unset($replacement);
+            }
+        }
+    }
+
+    /**
+     * Processes normal variables within a method.
+     *
+     * @param File $file The file where this token was found.
+     * @param int $stackptr The position where the token was found.
+     *
+     * @return void
+     */
+    protected function processVariable(File $phpcsFile, $stackPtr) {
+        // Find the method that this variable is declared in.
+        $methodPtr = $phpcsFile->findPrevious(T_FUNCTION, $stackPtr);
+        if ($methodPtr === false) {
+            // Not in a method.
+            return;  // @codeCoverageIgnore
+        }
+
+        $methodName = ObjectDeclarations::getName($phpcsFile, $methodPtr);
+        if ($methodName !== '__construct') {
+            // Not in a constructor.
+            return;
+        }
+
+        $method = $phpcsFile->getTokens()[$methodPtr];
+        if ($method['parenthesis_opener'] < $stackPtr && $method['parenthesis_closer'] > $stackPtr) {
+            $this->processMemberVar($phpcsFile, $stackPtr);
+            return;
+        }
+    }
+
+    /**
+     * Returns a valid variable type for param/var tags.
+     *
+     * If type is not one of the standard types, it must be a custom type.
+     * Returns the correct type name suggestion if type name is invalid.
+     *
+     * @param string $varType The variable type to process.
+     *
+     * @return string
+     */
+    protected static function suggestType(string $varType): string {
+        if (in_array($varType, self::$allowedTypes, true) === true) {
+            return $varType;
+        } elseif (substr($varType, -2) === '[]') {
+            return sprintf(
+                '%s[]',
+                self::suggestType(substr($varType, 0, -2))
+            );
+        } else {
+            $lowerVarType = strtolower($varType);
+            switch ($lowerVarType) {
+                case 'bool':
+                case 'boolean':
+                    return 'bool';
+                case 'double':
+                case 'real':
+                case 'float':
+                    return 'float';
+                case 'int':
+                case 'integer':
+                    return 'int';
+                case 'array()':
+                case 'array':
+                    return 'array';
+            }
+
+            if (strpos($lowerVarType, 'array(') !== false) {
+                // Valid array declaration:
+                // array, array(type), array(type1 => type2).
+                $matches = [];
+                $pattern = '/^array\(\s*([^\s^=^>]*)(\s*=>\s*(.*))?\s*\)/i';
+                if (preg_match($pattern, $varType, $matches) !== 0) {
+                    $type1 = '';
+                    if (isset($matches[1]) === true) {
+                        $type1 = $matches[1];
+                    }
+
+                    $type2 = '';
+                    if (isset($matches[3]) === true) {
+                        $type2 = $matches[3];
+                    }
+
+                    $type1 = self::suggestType($type1);
+                    $type2 = self::suggestType($type2);
+                    if ($type2 !== '') {
+                        $type2 = ' => ' . $type2;
+                    }
+
+                    return "array($type1$type2)";
+                } else {
+                    return 'array';
+                }
+            } elseif (in_array($lowerVarType, self::$allowedTypes, true) === true) {
+                // A valid type, but not lower cased.
+                return $lowerVarType;
+            } else {
+                // Must be a custom type name.
+                return $varType;
+            }
+        }
+    }
+
+    /**
+     * @codeCoverageIgnore
+     */
+    protected function processVariableInString(File $phpcsFile, $stackPtr) {
+    }
+}