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<?php

/**

 * Processes pattern strings and checks that the code conforms to the pattern.

 *

 * PHP version 5

 *

 * @category  PHP

 * @package   PHP_CodeSniffer

 * @author    Greg Sherwood <gsherwood@squiz.net>

 * @author    Marc McIntyre <mmcintyre@squiz.net>

 * @copyright 2006 Squiz Pty Ltd (ABN 77 084 670 600)

 * @license   http://matrix.squiz.net/developer/tools/php_cs/licence BSD Licence

 * @version   CVS: $Id: AbstractPatternSniff.php,v 1.26 2008/12/11 06:08:10 squiz Exp $

 * @link      http://pear.php.net/package/PHP_CodeSniffer

 */

if (class_exists('PHP_CodeSniffer_Standards_IncorrectPatternException', true) === false) {

    $error = 'Class PHP_CodeSniffer_Standards_IncorrectPatternException not found';

    throw new PHP_CodeSniffer_Exception($error);

}

/**

 * Processes pattern strings and checks that the code conforms to the pattern.

 *

 * This test essentially checks that code is correctly formatted with whitespace.

 *

 * @category  PHP

 * @package   PHP_CodeSniffer

 * @author    Greg Sherwood <gsherwood@squiz.net>

 * @author    Marc McIntyre <mmcintyre@squiz.net>

 * @copyright 2006 Squiz Pty Ltd (ABN 77 084 670 600)

 * @license   http://matrix.squiz.net/developer/tools/php_cs/licence BSD Licence

 * @version   Release: 1.2.0RC1

 * @link      http://pear.php.net/package/PHP_CodeSniffer

 */

abstract class PHP_CodeSniffer_Standards_AbstractPatternSniff implements PHP_CodeSniffer_Sniff

{

    /**

     * The parsed patterns array.

     *

     * @var array

     */

    private $_parsedPatterns = array();

    /**

     * Tokens that wish this sniff wishes to process outside of the patterns.

     *

     * @var array(int)

     * @see registerSupplementary()

     * @see processSupplementary()

     */

    private $_supplementaryTokens = array();

    /**

     * If true, comments will be ignored if they are found in the code.

     *

     * @var boolean

     */

    private $_ignoreComments = false;

    /**

     * Positions in the stack where errors have occured.

     *

     * @var array()

     */

    private $_errorPos = array();

    /**

     * Constructs a PHP_CodeSniffer_Standards_AbstractPatternSniff.

     *

     * @param boolean $ignoreComments If true, comments will be ignored.

     */

    public function __construct($ignoreComments=false)

    {

        $this->_ignoreComments      = $ignoreComments;

        $this->_supplementaryTokens = $this->registerSupplementary();

    }//end __construct()

    /**

     * Registers the tokens to listen to.

     *

     * Classes extending <i>AbstractPatternTest</i> should implement the

     * <i>getPatterns()</i> method to register the patterns they wish to test.

     *

     * @return array(int)

     * @see process()

     */

    public final function register()

    {

        $listenTypes = array();

        $patterns    = $this->getPatterns();

        foreach ($patterns as $pattern) {

            $parsedPattern = $this->_parse($pattern);

            // Find a token position in the pattern that we can use for a listener

            // token.

            $pos           = $this->_getListenerTokenPos($parsedPattern);

            $tokenType     = $parsedPattern[$pos]['token'];

            $listenTypes[] = $tokenType;

            $patternArray = array(

                             'listen_pos'   => $pos,

                             'pattern'      => $parsedPattern,

                             'pattern_code' => $pattern,

                            );

            if (isset($this->_parsedPatterns[$tokenType]) === false) {

                $this->_parsedPatterns[$tokenType] = array();

            }

            $this->_parsedPatterns[$tokenType][] = $patternArray;

        }//end foreach

        return array_unique(array_merge($listenTypes, $this->_supplementaryTokens));

    }//end register()

    /**

     * Returns the token types that the specified pattern is checking for.

     *

     * Returned array is in the format:

     * <code>

     *   array(

     *      T_WHITESPACE => 0, // 0 is the position where the T_WHITESPACE token

     *                         // should occur in the pattern.

     *   );

     * </code>

     *

     * @param array $pattern The parsed pattern to find the acquire the token

     *                       types from.

     *

     * @return array(int => int)

     */

    private function _getPatternTokenTypes($pattern)

    {

        $tokenTypes = array();

        foreach ($pattern as $pos => $patternInfo) {

            if ($patternInfo['type'] === 'token') {

                if (isset($tokenTypes[$patternInfo['token']]) === false) {

                    $tokenTypes[$patternInfo['token']] = $pos;

                }

            }

        }

        return $tokenTypes;

    }//end _getPatternTokenTypes()

    /**

     * Returns the position in the pattern that this test should register as

     * a listener for the pattern.

     *

     * @param array $pattern The pattern to acquire the listener for.

     *

     * @return int The postition in the pattern that this test should register

     *             as the listener.

     * @throws PHP_CodeSniffer_Exception If we could not determine a token

     *                                         to listen for.

     */

    private function _getListenerTokenPos($pattern)

    {

        $tokenTypes = $this->_getPatternTokenTypes($pattern);

        $tokenCodes = array_keys($tokenTypes);

        $token      = PHP_CodeSniffer_Tokens::getHighestWeightedToken($tokenCodes);

        // If we could not get a token.

        if ($token === false) {

            $error = 'Could not determine a token to listen for';

            throw new PHP_CodeSniffer_Exception($error);

        }

        return $tokenTypes[$token];

    }//end _getListenerTokenPos()

    /**

     * Processes the test.

     *

     * @param PHP_CodeSniffer_File $phpcsFile The PHP_CodeSniffer file where the

     *                                        token occured.

     * @param int                  $stackPtr  The postion in the tokens stack

     *                                        where the listening token type was

     *                                        found.

     *

     * @return void

     * @see register()

     */

    public final function process(PHP_CodeSniffer_File $phpcsFile, $stackPtr)

    {

        $tokens = $phpcsFile->getTokens();

        if (in_array($tokens[$stackPtr]['code'], $this->_supplementaryTokens) === true) {

            $this->processSupplementary($phpcsFile, $stackPtr);

        }

        $type = $tokens[$stackPtr]['code'];

        // If the type is not set, then it must have been a token registered

        // with registerSupplementary().

        if (isset($this->_parsedPatterns[$type]) === false) {

            return;

        }

        $allErrors = array();

        // Loop over each pattern that is listening to the current token type

        // that we are processing.

        foreach ($this->_parsedPatterns[$type] as $patternInfo) {

            // If processPattern returns false, then the pattern that we are

            // checking the code with must not be design to check that code.

            $errors = $this->processPattern($patternInfo, $phpcsFile, $stackPtr);

            if ($errors === false) {

                // The pattern didn't match.

                continue;

            } else if (empty($errors) === true) {

                // The pattern matched, but there were no errors.

                break;

            }

            foreach ($errors as $stackPtr => $error) {

                if (isset($this->_errorPos[$stackPtr]) === false) {

                    $this->_errorPos[$stackPtr] = true;

                    $allErrors[$stackPtr]       = $error;

                }

            }

        }

        foreach ($allErrors as $stackPtr => $error) {

            $phpcsFile->addError($error, $stackPtr);

        }

    }//end process()

    /**

     * Processes the pattern and verifies the code at $stackPtr.

     *

     * @param array                $patternInfo Information about the pattern used

     *                                          for checking, which includes are

     *                                          parsed token representation of the

     *                                          pattern.

     * @param PHP_CodeSniffer_File $phpcsFile   The PHP_CodeSniffer file where the

     *                                          token occured.

     * @param int                  $stackPtr    The postion in the tokens stack where

     *                                          the listening token type was found.

     *

     * @return array(errors)

     */

    protected function processPattern(

        $patternInfo,

        PHP_CodeSniffer_File $phpcsFile,

        $stackPtr

    ) {

        $tokens      = $phpcsFile->getTokens();

        $pattern     = $patternInfo['pattern'];

        $patternCode = $patternInfo['pattern_code'];

        $errors      = array();

        $found       = '';

        $ignoreTokens = array(T_WHITESPACE);

        if ($this->_ignoreComments === true) {

            $ignoreTokens

                = array_merge($ignoreTokens, PHP_CodeSniffer_Tokens::$commentTokens);

        }

        $origStackPtr = $stackPtr;

        $hasError     = false;

        if ($patternInfo['listen_pos'] > 0) {

            $stackPtr--;

            for ($i = ($patternInfo['listen_pos'] - 1); $i >= 0; $i--) {

                if ($pattern[$i]['type'] === 'token') {

                    if ($pattern[$i]['token'] === T_WHITESPACE) {

                        if ($tokens[$stackPtr]['code'] === T_WHITESPACE) {

                            $found = $tokens[$stackPtr]['content'].$found;

                        }

                        // Only check the size of the whitespace if this is not

                        // not the first token. We don't care about the size of

                        // leading whitespace, just that there is some.

                        if ($i !== 0) {

                            if ($tokens[$stackPtr]['content'] !== $pattern[$i]['value']) {

                                $hasError = true;

                            }

                        }

                    } else {

                        // Check to see if this important token is the same as the

                        // previous important token in the pattern. If it is not,

                        // then the pattern cannot be for this piece of code.

                        $prev = $phpcsFile->findPrevious(

                            $ignoreTokens,

                            $stackPtr,

                            null,

                            true

                        );

                        if ($prev === false

                            || $tokens[$prev]['code'] !== $pattern[$i]['token']

                        ) {

                            return false;

                        }

                        // If we skipped past some whitespace tokens, then add them

                        // to the found string.

                        if (($stackPtr - $prev) > 1) {

                            for ($j = ($stackPtr - 1); $j > $prev; $j--) {

                                $found = $tokens[$j]['content'].$found;

                            }

                        }

                        $found = $tokens[$prev]['content'].$found;

                        if (isset($pattern[($i - 1)]) === true

                            && $pattern[($i - 1)]['type'] === 'skip'

                        ) {

                            $stackPtr = $prev;

                        } else {

                            $stackPtr = ($prev - 1);

                        }

                    }//end if

                } else if ($pattern[$i]['type'] === 'skip') {

                    // Skip to next piece of relevant code.

                    if ($pattern[$i]['to'] === 'parenthesis_closer') {

                        $to = 'parenthesis_opener';

                    } else {

                        $to = 'scope_opener';

                    }

                    // Find the previous opener.

                    $next = $phpcsFile->findPrevious(

                        $ignoreTokens,

                        $stackPtr,

                        null,

                        true

                    );

                    if ($next === false || isset($tokens[$next][$to]) === false) {

                        // If there was not opener, then we must be

                        // using the wrong pattern.

                        return false;

                    }

                    if ($to === 'parenthesis_opener') {

                        $found = '{'.$found;

                    } else {

                        $found = '('.$found;

                    }

                    $found = '...'.$found;

                    // Skip to the opening token.

                    $stackPtr = ($tokens[$next][$to] - 1);

                } else if ($pattern[$i]['type'] === 'string') {

                    $found = 'abc';

                } else if ($pattern[$i]['type'] === 'newline') {

                    $found = 'EOL';

                }//end if

            }//end for

        }//end if

        $stackPtr          = $origStackPtr;

        $lastAddedStackPtr = null;

        $patternLen        = count($pattern);

        for ($i = $patternInfo['listen_pos']; $i < $patternLen; $i++) {

            if ($pattern[$i]['type'] === 'token') {

                if ($pattern[$i]['token'] === T_WHITESPACE) {

                    if ($this->_ignoreComments === true) {

                        // If we are ignoring comments, check to see if this current

                        // token is a comment. If so skip it.

                        if (in_array($tokens[$stackPtr]['code'], PHP_CodeSniffer_Tokens::$commentTokens) === true) {

                            continue;

                        }

                        // If the next token is a comment, the we need to skip the

                        // current token as we should allow a space before a

                        // comment for readability.

                        if (in_array($tokens[($stackPtr + 1)]['code'], PHP_CodeSniffer_Tokens::$commentTokens) === true) {

                            continue;

                        }

                    }

                    $tokenContent = '';

                    if ($tokens[$stackPtr]['code'] === T_WHITESPACE) {

                        if (isset($pattern[($i + 1)]) === false) {

                            // This is the last token in the pattern, so just compare

                            // the next token of content.

                            $tokenContent = $tokens[$stackPtr]['content'];

                        } else {

                            // Get all the whitespace to the next token.

                            $next = $phpcsFile->findNext(

                                PHP_CodeSniffer_Tokens::$emptyTokens,

                                $stackPtr,

                                null,

                                true

                            );

                            $tokenContent = $phpcsFile->getTokensAsString(

                                $stackPtr,

                                ($next - $stackPtr)

                            );

                            $lastAddedStackPtr = $stackPtr;

                            $stackPtr          = $next;

                        }

                        if ($stackPtr !== $lastAddedStackPtr) {

                            $found .= $tokenContent;

                        }

                    } else {

                        if ($stackPtr !== $lastAddedStackPtr) {

                            $found            .= $tokens[$stackPtr]['content'];

                            $lastAddedStackPtr = $stackPtr;

                        }

                    }//end if

                    if (isset($pattern[($i + 1)]) === true

                        && $pattern[($i + 1)]['type'] === 'skip'

                    ) {

                        // The next token is a skip token, so we just need to make

                        // sure the whitespace we found has *at least* the

                        // whitespace required.

                        if (strpos($tokenContent, $pattern[$i]['value']) !== 0) {

                            $hasError = true;

                        }

                    } else {

                        if ($tokenContent !== $pattern[$i]['value']) {

                            $hasError = true;

                        }

                    }

                } else {

                    // Check to see if this important token is the same as the

                    // next important token in the pattern. If it is not, then

                    // the pattern cannot be for this piece of code.

                    $next = $phpcsFile->findNext(

                        $ignoreTokens,

                        $stackPtr,

                        null,

                        true

                    );

                    if ($next === false

                        || $tokens[$next]['code'] !== $pattern[$i]['token']

                    ) {

                        return false;

                    }

                    // If we skipped past some whitespace tokens, then add them

                    // to the found string.

                    if (($next - $stackPtr) > 0) {

                        $hasComment = false;

                        for ($j = $stackPtr; $j < $next; $j++) {

                            $found .= $tokens[$j]['content'];

                            if (in_array($tokens[$j]['code'], PHP_CodeSniffer_Tokens::$commentTokens) === true) {

                                $hasComment = true;

                            }

                        }

                        // If we are not ignoring comments, this additional

                        // whitespace or comment is not allowed. If we are

                        // ignoring comments, there needs to be at least one

                        // comment for this to be allowed.

                        if ($this->_ignoreComments === false

                            || ($this->_ignoreComments === true

                            && $hasComment === false)

                        ) {

                            $hasError = true;

                        }

                        // Even when ignoring comments, we are not allowed to include

                        // newlines without the pattern specifying them, so

                        // everything should be on the same line.

                        if ($tokens[$next]['line'] !== $tokens[$stackPtr]['line']) {

                            $hasError = true;

                        }

                    }//end if

                    if ($next !== $lastAddedStackPtr) {

                        $found            .= $tokens[$next]['content'];

                        $lastAddedStackPtr = $next;

                    }

                    if (isset($pattern[($i + 1)]) === true

                        && $pattern[($i + 1)]['type'] === 'skip'

                    ) {

                        $stackPtr = $next;

                    } else {

                        $stackPtr = ($next + 1);

                    }

                }//end if

            } else if ($pattern[$i]['type'] === 'skip') {

                if ($pattern[$i]['to'] === 'unknown') {

                    $next = $phpcsFile->findNext(

                        $pattern[($i + 1)]['token'],

                        $stackPtr

                    );

                    if ($next === false) {

                        // Couldn't find the next token, sowe we must

                        // be using the wrong pattern.

                        return false;

                    }

                    $found   .= '...';

                    $stackPtr = $next;

                } else {

                    // Find the previous opener.

                    $next = $phpcsFile->findPrevious(

                        PHP_CodeSniffer_Tokens::$blockOpeners,

                        $stackPtr

                    );

                    if ($next === false

                        || isset($tokens[$next][$pattern[$i]['to']]) === false

                    ) {

                        // If there was not opener, then we must

                        // be using the wrong pattern.

                        return false;

                    }

                    $found .= '...';

                    if ($pattern[$i]['to'] === 'parenthesis_closer') {

                        $found .= ')';

                    } else {

                        $found .= '}';

                    }

                    // Skip to the closing token.

                    $stackPtr = ($tokens[$next][$pattern[$i]['to']] + 1);

                }

            } else if ($pattern[$i]['type'] === 'string') {

                if ($tokens[$stackPtr]['code'] !== T_STRING) {

                    $hasError = true;

                }

                if ($stackPtr !== $lastAddedStackPtr) {

                    $found            .= 'abc';

                    $lastAddedStackPtr = $stackPtr;

                }

                $stackPtr++;

            } else if ($pattern[$i]['type'] === 'newline') {

                // Find the next token that contains a newline character.

                $newline = 0;

                for ($j = $stackPtr; $j < $phpcsFile->numTokens; $j++) {

                    if (strpos($tokens[$j]['content'], $phpcsFile->eolChar) !== false) {

                        $newline = $j;

                        break;

                    }

                }

                if ($newline === 0) {

                    // We didn't find a newline character in the rest of the file.

                    $next     = ($phpcsFile->numTokens - 1);

                    $hasError = true;

                } else {

                    if ($this->_ignoreComments === false) {

                        // The newline character cannot be part of a comment.

                        if (in_array($tokens[$newline]['code'], PHP_CodeSniffer_Tokens::$commentTokens) === true) {

                            $hasError = true;

                        }

                    }

                    if ($newline === $stackPtr) {

                        $next = ($stackPtr + 1);

                    } else {

                        // Check that there were no significant tokens that we

                        // skipped over to find our newline character.

                        $next = $phpcsFile->findNext(

                            $ignoreTokens,

                            $stackPtr,

                            null,

                            true

                        );

                        if ($next < $newline) {

                            // We skipped a non-ignored token.

                            $hasError = true;

                        } else {

                            $next = ($newline + 1);

                        }

                    }

                }//end if

                if ($stackPtr !== $lastAddedStackPtr) {

                    $found .= $phpcsFile->getTokensAsString(

                        $stackPtr,

                        ($next - $stackPtr)

                    );

                    $diff = ($next - $stackPtr);

                    $lastAddedStackPtr = ($next - 1);

                }

                $stackPtr = $next;

            }//end if

        }//end for

        if ($hasError === true) {

            $error = $this->prepareError($found, $patternCode);

            $errors[$origStackPtr] = $error;

        }

        return $errors;

    }//end processPattern()

    /**

     * Prepares an error for the specified patternCode.

     *

     * @param string $found       The actual found string in the code.

     * @param string $patternCode The expected pattern code.

     *

     * @return string The error message.

     */

    protected function prepareError($found, $patternCode)

    {

        $found    = str_replace("\r\n", '\n', $found);

        $found    = str_replace("\n", '\n', $found);

        $found    = str_replace("\r", '\n', $found);

        $found    = str_replace('EOL', '\n', $found);

        $expected = str_replace('EOL', '\n', $patternCode);

        $error = "Expected \"$expected\"; found \"$found\"";

        return $error;

    }//end prepareError()

    /**

     * Returns the patterns that should be checked.

     *

     * @return array(string)

     */

    protected abstract function getPatterns();

    /**

     * Registers any supplementary tokens that this test might wish to process.

     *

     * A sniff may wish to register supplementary tests when it wishes to group

     * an arbitary validation that cannot be performed using a pattern, with

     * other pattern tests.

     *

     * @return array(int)

     * @see processSupplementary()

     */

    protected function registerSupplementary()

    {

        return array();

    }//end registerSupplementary()

     /**

      * Processes any tokens registered with registerSupplementary().

      *

      * @param PHP_CodeSniffer_File $phpcsFile The PHP_CodeSniffer file where to

      *                                        process the skip.

      * @param int                  $stackPtr  The position in the tokens stack to

      *                                        process.

      *

      * @return void

      * @see registerSupplementary()

      */

    protected function processSupplementary(

        PHP_CodeSniffer_File $phpcsFile,

        $stackPtr

    ) {

         return;

    }//end processSupplementary()

    /**

     * Parses a pattern string into an array of pattern steps.

     *

     * @param string $pattern The pattern to parse.

     *

     * @return array The parsed pattern array.

     * @see _createSkipPattern()

     * @see _createTokenPattern()

     */

    private function _parse($pattern)

    {

        $patterns   = array();

        $length     = strlen($pattern);

        $lastToken  = 0;

        $firstToken = 0;

        for ($i = 0; $i < $length; $i++) {

            $specialPattern = false;

            $isLastChar     = ($i === ($length - 1));

            $oldFirstToken  = $firstToken;

            if (substr($pattern, $i, 3) === '...') {

                // It's a skip pattern. The skip pattern requires the

                // content of the token in the "from" position and the token

                // to skip to.

                $specialPattern = $this->_createSkipPattern($pattern, ($i - 1));

                $lastToken      = ($i - $firstToken);

                $firstToken     = ($i + 3);

                $i              = ($i + 3);

                if ($specialPattern['to'] !== 'unknown') {

                    $firstToken++;

                }

            } else if (substr($pattern, $i, 3) === 'abc') {

                $specialPattern = array('type' => 'string');

                $lastToken      = ($i - $firstToken);

                $firstToken     = ($i + 3);

                $i              = ($i + 2);

            } else if (substr($pattern, $i, 3) === 'EOL') {

                $specialPattern = array('type' => 'newline');

                $lastToken      = ($i - $firstToken);

                $firstToken     = ($i + 3);

                $i              = ($i + 2);

            }

            if ($specialPattern !== false || $isLastChar === true) {

                // If we are at the end of the string, don't worry about a limit.

                if ($isLastChar === true) {

                    // Get the string from the end of the last skip pattern, if any,

                    // to the end of the pattern string.

                    $str = substr($pattern, $oldFirstToken);

                } else {

                    // Get the string from the end of the last special pattern,

                    // if any, to the start of this special pattern.

                    $str = substr($pattern, $oldFirstToken, $lastToken);

                }

                $tokenPatterns = $this->_createTokenPattern($str);

                // Make sure we don't skip the last token.

                if ($isLastChar === false && $i === ($length - 1)) {

                    $i--;

                }

                foreach ($tokenPatterns as $tokenPattern) {

                    $patterns[] = $tokenPattern;

                }

            }//end if

            // Add the skip pattern *after* we have processed

            // all the tokens from the end of the last skip pattern

            // to the start of this skip pattern.

            if ($specialPattern !== false) {

                $patterns[] = $specialPattern;

            }

        }//end for

        return $patterns;

    }//end _parse()

    /**

     * Creates a skip pattern.

     *

     * @param string $pattern The pattern being parsed.

     * @param string $from    The token content that the skip pattern starts from.

     *

     * @return array The pattern step.

     * @see _createTokenPattern()

     * @see _parse()

     */

    private function _createSkipPattern($pattern, $from)

    {

        $skip = array('type' => 'skip');

        $nestedParenthesis = 0;

        for ($start = $from; $start >= 0; $start--) {

            switch ($pattern[$start]) {

            case '(':

                if ($nestedParenthesis === 0) {

                    $skip['to'] = 'parenthesis_closer';

                }

                $nestedParenthesis--;

                break;

            case '{':

                $skip['to'] = 'scope_closer';

                break;

            case ')':

                $nestedParenthesis++;

                break;

            }

            if (isset($skip['to']) === true) {

                break;

            }

        }

        if (isset($skip['to']) === false) {

            $skip['to'] = 'unknown';

        }

        return $skip;

    }//end _createSkipPattern()

    /**

     * Creates a token pattern.

     *

     * @param string $str The tokens string that the pattern should match.

     *

     * @return array The pattern step.

     * @see _createSkipPattern()

     * @see _parse()

     */

    private function _createTokenPattern($str)

    {

        // Don't add a space after the closing php tag as it will add a new

        // whitespace token.

        $tokens = token_get_all('<?php '.$str.'?>');

        // Remove the <?php tag from the front and the end php tag from the back.

        $tokens = array_slice($tokens, 1, (count($tokens) - 2));

        foreach ($tokens as &$token) {

            $token = PHP_CodeSniffer::standardiseToken($token);

        }

        $patterns = array();

        foreach ($tokens as $patternInfo) {

            $patterns[] = array(

                           'type'  => 'token',

                           'token' => $patternInfo['code'],

                           'value' => $patternInfo['content'],

                          );

        }

        return $patterns;

    }//end _createTokenPattern()

}//end class

?>