/php/PHP_CodeSniffer/src/Standards/Squiz/Sniffs/Commenting/FunctionCommentThrowTagSniff.php
PHP | 233 lines | 154 code | 34 blank | 45 comment | 29 complexity | 313377363b681107ec24d241bf2fb843 MD5 | raw file
Possible License(s): BSD-3-Clause, AGPL-1.0, 0BSD, MIT
- <?php
- /**
- * Verifies that a @throws tag exists for each exception type a function throws.
- *
- * @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\Squiz\Sniffs\Commenting;
- use PHP_CodeSniffer\Sniffs\Sniff;
- use PHP_CodeSniffer\Files\File;
- use PHP_CodeSniffer\Util\Tokens;
- class FunctionCommentThrowTagSniff implements Sniff
- {
- /**
- * Returns an array of tokens this test wants to listen for.
- *
- * @return array
- */
- public function register()
- {
- return [T_FUNCTION];
- }//end register()
- /**
- * Processes this test, 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[$stackPtr]['scope_closer']) === false) {
- // Abstract or incomplete.
- return;
- }
- $find = Tokens::$methodPrefixes;
- $find[] = T_WHITESPACE;
- $commentEnd = $phpcsFile->findPrevious($find, ($stackPtr - 1), null, true);
- if ($tokens[$commentEnd]['code'] !== T_DOC_COMMENT_CLOSE_TAG) {
- // Function doesn't have a doc comment or is using the wrong type of comment.
- return;
- }
- $stackPtrEnd = $tokens[$stackPtr]['scope_closer'];
- // Find all the exception type tokens within the current scope.
- $thrownExceptions = [];
- $currPos = $stackPtr;
- $foundThrows = false;
- $unknownCount = 0;
- do {
- $currPos = $phpcsFile->findNext([T_THROW, T_ANON_CLASS, T_CLOSURE], ($currPos + 1), $stackPtrEnd);
- if ($currPos === false) {
- break;
- }
- if ($tokens[$currPos]['code'] !== T_THROW) {
- $currPos = $tokens[$currPos]['scope_closer'];
- continue;
- }
- $foundThrows = true;
- /*
- If we can't find a NEW, we are probably throwing
- a variable or calling a method.
- If we're throwing a variable, and it's the same variable as the
- exception container from the nearest 'catch' block, we take that exception
- as it is likely to be a re-throw.
- If we can't find a matching catch block, or the variable name
- is different, it's probably a different variable, so we ignore it,
- but they still need to provide at least one @throws tag, even through we
- don't know the exception class.
- */
- $nextToken = $phpcsFile->findNext(T_WHITESPACE, ($currPos + 1), null, true);
- if ($tokens[$nextToken]['code'] === T_NEW
- || $tokens[$nextToken]['code'] === T_NS_SEPARATOR
- || $tokens[$nextToken]['code'] === T_STRING
- ) {
- if ($tokens[$nextToken]['code'] === T_NEW) {
- $currException = $phpcsFile->findNext(
- [
- T_NS_SEPARATOR,
- T_STRING,
- ],
- $currPos,
- $stackPtrEnd,
- false,
- null,
- true
- );
- } else {
- $currException = $nextToken;
- }
- if ($currException !== false) {
- $endException = $phpcsFile->findNext(
- [
- T_NS_SEPARATOR,
- T_STRING,
- ],
- ($currException + 1),
- $stackPtrEnd,
- true,
- null,
- true
- );
- if ($endException === false) {
- $thrownExceptions[] = $tokens[$currException]['content'];
- } else {
- $thrownExceptions[] = $phpcsFile->getTokensAsString($currException, ($endException - $currException));
- }
- }//end if
- } else if ($tokens[$nextToken]['code'] === T_VARIABLE) {
- // Find the nearest catch block in this scope and, if the caught var
- // matches our rethrown var, use the exception types being caught as
- // exception types that are being thrown as well.
- $catch = $phpcsFile->findPrevious(
- T_CATCH,
- $currPos,
- $tokens[$stackPtr]['scope_opener'],
- false,
- null,
- false
- );
- if ($catch !== false) {
- $thrownVar = $phpcsFile->findPrevious(
- T_VARIABLE,
- ($tokens[$catch]['parenthesis_closer'] - 1),
- $tokens[$catch]['parenthesis_opener']
- );
- if ($tokens[$thrownVar]['content'] === $tokens[$nextToken]['content']) {
- $exceptions = explode('|', $phpcsFile->getTokensAsString(($tokens[$catch]['parenthesis_opener'] + 1), ($thrownVar - $tokens[$catch]['parenthesis_opener'] - 1)));
- foreach ($exceptions as $exception) {
- $thrownExceptions[] = trim($exception);
- }
- }
- }
- } else {
- ++$unknownCount;
- }//end if
- } while ($currPos < $stackPtrEnd && $currPos !== false);
- if ($foundThrows === false) {
- return;
- }
- // Only need one @throws tag for each type of exception thrown.
- $thrownExceptions = array_unique($thrownExceptions);
- $throwTags = [];
- $commentStart = $tokens[$commentEnd]['comment_opener'];
- foreach ($tokens[$commentStart]['comment_tags'] as $tag) {
- if ($tokens[$tag]['content'] !== '@throws') {
- continue;
- }
- if ($tokens[($tag + 2)]['code'] === T_DOC_COMMENT_STRING) {
- $exception = $tokens[($tag + 2)]['content'];
- $space = strpos($exception, ' ');
- if ($space !== false) {
- $exception = substr($exception, 0, $space);
- }
- $throwTags[$exception] = true;
- }
- }
- if (empty($throwTags) === true) {
- $error = 'Missing @throws tag in function comment';
- $phpcsFile->addError($error, $commentEnd, 'Missing');
- return;
- } else if (empty($thrownExceptions) === true) {
- // If token count is zero, it means that only variables are being
- // thrown, so we need at least one @throws tag (checked above).
- // Nothing more to do.
- return;
- }
- // Make sure @throws tag count matches thrown count.
- $thrownCount = (count($thrownExceptions) + $unknownCount);
- $tagCount = count($throwTags);
- if ($thrownCount !== $tagCount) {
- $error = 'Expected %s @throws tag(s) in function comment; %s found';
- $data = [
- $thrownCount,
- $tagCount,
- ];
- $phpcsFile->addError($error, $commentEnd, 'WrongNumber', $data);
- return;
- }
- foreach ($thrownExceptions as $throw) {
- if (isset($throwTags[$throw]) === true) {
- continue;
- }
- foreach ($throwTags as $tag => $ignore) {
- if (strrpos($tag, $throw) === (strlen($tag) - strlen($throw))) {
- continue 2;
- }
- }
- $error = 'Missing @throws tag for "%s" exception';
- $data = [$throw];
- $phpcsFile->addError($error, $commentEnd, 'Missing', $data);
- }
- }//end process()
- }//end class