<?php
/**
 * Tokenizes JS code.
 *
 * PHP version 5
 *
 * @category  PHP
 * @package   PHP_CodeSniffer
 * @author    Greg Sherwood <gsherwood@squiz.net>
 * @author    Marc McIntyre <mmcintyre@squiz.net>
 * @copyright 2006-2014 Squiz Pty Ltd (ABN 77 084 670 600)
 * @license   https://github.com/squizlabs/PHP_CodeSniffer/blob/master/licence.txt BSD Licence
 * @link      http://pear.php.net/package/PHP_CodeSniffer
 */

/**
 * Tokenizes JS code.
 *
 * @category  PHP
 * @package   PHP_CodeSniffer
 * @author    Greg Sherwood <gsherwood@squiz.net>
 * @copyright 2006-2014 Squiz Pty Ltd (ABN 77 084 670 600)
 * @license   https://github.com/squizlabs/PHP_CodeSniffer/blob/master/licence.txt BSD Licence
 * @version   Release: @package_version@
 * @link      http://pear.php.net/package/PHP_CodeSniffer
 */
class PHP_CodeSniffer_Tokenizers_JS
{

    /**
     * A list of tokens that are allowed to open a scope.
     *
     * This array also contains information about what kind of token the scope
     * opener uses to open and close the scope, if the token strictly requires
     * an opener, if the token can share a scope closer, and who it can be shared
     * with. An example of a token that shares a scope closer is a CASE scope.
     *
     * @var array
     */
    public $scopeOpeners = array(
                            T_IF       => array(
                                           'start'  => array(T_OPEN_CURLY_BRACKET => T_OPEN_CURLY_BRACKET),
                                           'end'    => array(T_CLOSE_CURLY_BRACKET => T_CLOSE_CURLY_BRACKET),
                                           'strict' => false,
                                           'shared' => false,
                                           'with'   => array(),
                                          ),
                            T_TRY      => array(
                                           'start'  => array(T_OPEN_CURLY_BRACKET => T_OPEN_CURLY_BRACKET),
                                           'end'    => array(T_CLOSE_CURLY_BRACKET => T_CLOSE_CURLY_BRACKET),
                                           'strict' => true,
                                           'shared' => false,
                                           'with'   => array(),
                                          ),
                            T_CATCH    => array(
                                           'start'  => array(T_OPEN_CURLY_BRACKET => T_OPEN_CURLY_BRACKET),
                                           'end'    => array(T_CLOSE_CURLY_BRACKET => T_CLOSE_CURLY_BRACKET),
                                           'strict' => true,
                                           'shared' => false,
                                           'with'   => array(),
                                          ),
                            T_ELSE     => array(
                                           'start'  => array(T_OPEN_CURLY_BRACKET => T_OPEN_CURLY_BRACKET),
                                           'end'    => array(T_CLOSE_CURLY_BRACKET => T_CLOSE_CURLY_BRACKET),
                                           'strict' => false,
                                           'shared' => false,
                                           'with'   => array(),
                                          ),
                            T_FOR      => array(
                                           'start'  => array(T_OPEN_CURLY_BRACKET => T_OPEN_CURLY_BRACKET),
                                           'end'    => array(T_CLOSE_CURLY_BRACKET => T_CLOSE_CURLY_BRACKET),
                                           'strict' => false,
                                           'shared' => false,
                                           'with'   => array(),
                                          ),
                            T_FUNCTION => array(
                                           'start'  => array(T_OPEN_CURLY_BRACKET => T_OPEN_CURLY_BRACKET),
                                           'end'    => array(T_CLOSE_CURLY_BRACKET => T_CLOSE_CURLY_BRACKET),
                                           'strict' => false,
                                           'shared' => false,
                                           'with'   => array(),
                                          ),
                            T_WHILE    => array(
                                           'start'  => array(T_OPEN_CURLY_BRACKET => T_OPEN_CURLY_BRACKET),
                                           'end'    => array(T_CLOSE_CURLY_BRACKET => T_CLOSE_CURLY_BRACKET),
                                           'strict' => false,
                                           'shared' => false,
                                           'with'   => array(),
                                          ),
                            T_DO       => array(
                                           'start'  => array(T_OPEN_CURLY_BRACKET => T_OPEN_CURLY_BRACKET),
                                           'end'    => array(T_CLOSE_CURLY_BRACKET => T_CLOSE_CURLY_BRACKET),
                                           'strict' => true,
                                           'shared' => false,
                                           'with'   => array(),
                                          ),
                            T_SWITCH   => array(
                                           'start'  => array(T_OPEN_CURLY_BRACKET => T_OPEN_CURLY_BRACKET),
                                           'end'    => array(T_CLOSE_CURLY_BRACKET => T_CLOSE_CURLY_BRACKET),
                                           'strict' => true,
                                           'shared' => false,
                                           'with'   => array(),
                                          ),
                            T_CASE     => array(
                                           'start'  => array(T_COLON => T_COLON),
                                           'end'    => array(
                                                        T_BREAK    => T_BREAK,
                                                        T_RETURN   => T_RETURN,
                                                        T_CONTINUE => T_CONTINUE,
                                                        T_THROW    => T_THROW,
                                                       ),
                                           'strict' => true,
                                           'shared' => true,
                                           'with'   => array(
                                                        T_DEFAULT => T_DEFAULT,
                                                        T_CASE    => T_CASE,
                                                        T_SWITCH  => T_SWITCH,
                                                       ),
                                          ),
                            T_DEFAULT  => array(
                                           'start'  => array(T_COLON => T_COLON),
                                           'end'    => array(
                                                        T_BREAK    => T_BREAK,
                                                        T_RETURN   => T_RETURN,
                                                        T_CONTINUE => T_CONTINUE,
                                                        T_THROW    => T_THROW,
                                                       ),
                                           'strict' => true,
                                           'shared' => true,
                                           'with'   => array(
                                                        T_CASE   => T_CASE,
                                                        T_SWITCH => T_SWITCH,
                                                       ),
                                          ),
                           );

    /**
     * A list of tokens that end the scope.
     *
     * This array is just a unique collection of the end tokens
     * from the _scopeOpeners array. The data is duplicated here to
     * save time during parsing of the file.
     *
     * @var array
     */
    public $endScopeTokens = array(
                              T_CLOSE_CURLY_BRACKET => T_CLOSE_CURLY_BRACKET,
                              T_BREAK               => T_BREAK,
                             );

    /**
     * A list of special JS tokens and their types.
     *
     * @var array
     */
    protected $tokenValues = array(
                              'function'  => 'T_FUNCTION',
                              'prototype' => 'T_PROTOTYPE',
                              'try'       => 'T_TRY',
                              'catch'     => 'T_CATCH',
                              'return'    => 'T_RETURN',
                              'throw'     => 'T_THROW',
                              'break'     => 'T_BREAK',
                              'switch'    => 'T_SWITCH',
                              'continue'  => 'T_CONTINUE',
                              'if'        => 'T_IF',
                              'else'      => 'T_ELSE',
                              'do'        => 'T_DO',
                              'while'     => 'T_WHILE',
                              'for'       => 'T_FOR',
                              'var'       => 'T_VAR',
                              'case'      => 'T_CASE',
                              'default'   => 'T_DEFAULT',
                              'true'      => 'T_TRUE',
                              'false'     => 'T_FALSE',
                              'null'      => 'T_NULL',
                              'this'      => 'T_THIS',
                              'typeof'    => 'T_TYPEOF',
                              '('         => 'T_OPEN_PARENTHESIS',
                              ')'         => 'T_CLOSE_PARENTHESIS',
                              '{'         => 'T_OPEN_CURLY_BRACKET',
                              '}'         => 'T_CLOSE_CURLY_BRACKET',
                              '['         => 'T_OPEN_SQUARE_BRACKET',
                              ']'         => 'T_CLOSE_SQUARE_BRACKET',
                              '?'         => 'T_INLINE_THEN',
                              '.'         => 'T_OBJECT_OPERATOR',
                              '+'         => 'T_PLUS',
                              '-'         => 'T_MINUS',
                              '*'         => 'T_MULTIPLY',
                              '%'         => 'T_MODULUS',
                              '/'         => 'T_DIVIDE',
                              '^'         => 'T_LOGICAL_XOR',
                              ','         => 'T_COMMA',
                              ';'         => 'T_SEMICOLON',
                              ':'         => 'T_COLON',
                              '<'         => 'T_LESS_THAN',
                              '>'         => 'T_GREATER_THAN',
                              '<='        => 'T_IS_SMALLER_OR_EQUAL',
                              '>='        => 'T_IS_GREATER_OR_EQUAL',
                              '!'         => 'T_BOOLEAN_NOT',
                              '||'        => 'T_BOOLEAN_OR',
                              '&&'        => 'T_BOOLEAN_AND',
                              '|'         => 'T_BITWISE_OR',
                              '&'         => 'T_BITWISE_AND',
                              '!='        => 'T_IS_NOT_EQUAL',
                              '!=='       => 'T_IS_NOT_IDENTICAL',
                              '='         => 'T_EQUAL',
                              '=='        => 'T_IS_EQUAL',
                              '==='       => 'T_IS_IDENTICAL',
                              '-='        => 'T_MINUS_EQUAL',
                              '+='        => 'T_PLUS_EQUAL',
                              '*='        => 'T_MUL_EQUAL',
                              '/='        => 'T_DIV_EQUAL',
                              '%='        => 'T_MOD_EQUAL',
                              '++'        => 'T_INC',
                              '--'        => 'T_DEC',
                              '//'        => 'T_COMMENT',
                              '/*'        => 'T_COMMENT',
                              '/**'       => 'T_DOC_COMMENT',
                              '*/'        => 'T_COMMENT',
                             );

    /**
     * A list string delimiters.
     *
     * @var array
     */
    protected $stringTokens = array(
                               '\'' => '\'',
                               '"'  => '"',
                              );

    /**
     * A list tokens that start and end comments.
     *
     * @var array
     */
    protected $commentTokens = array(
                                '//'  => null,
                                '/*'  => '*/',
                                '/**' => '*/',
                               );


    /**
     * Creates an array of tokens when given some PHP code.
     *
     * Starts by using token_get_all() but does a lot of extra processing
     * to insert information about the context of the token.
     *
     * @param string $string  The string to tokenize.
     * @param string $eolChar The EOL character to use for splitting strings.
     *
     * @return array
     */
    public function tokenizeString($string, $eolChar='\n')
    {
        if (PHP_CODESNIFFER_VERBOSITY > 1) {
            echo "\t*** START JS TOKENIZING ***".PHP_EOL;
        }

        $maxTokenLength = 0;
        foreach ($this->tokenValues as $token => $values) {
            if (strlen($token) > $maxTokenLength) {
                $maxTokenLength = strlen($token);
            }
        }

        $tokens          = array();
        $inString        = '';
        $stringChar      = null;
        $inComment       = '';
        $buffer          = '';
        $preStringBuffer = '';
        $cleanBuffer     = false;

        $commentTokenizer = new PHP_CodeSniffer_Tokenizers_Comment();

        $tokens[] = array(
                     'code'    => T_OPEN_TAG,
                     'type'    => 'T_OPEN_TAG',
                     'content' => '',
                    );

        // Convert newlines to single characters for ease of
        // processing. We will change them back later.
        $string = str_replace($eolChar, "\n", $string);

        $chars    = str_split($string);
        $numChars = count($chars);
        for ($i = 0; $i < $numChars; $i++) {
            $char = $chars[$i];

            if (PHP_CODESNIFFER_VERBOSITY > 1) {
                $content       = PHP_CodeSniffer::prepareForOutput($char);
                $bufferContent = PHP_CodeSniffer::prepareForOutput($buffer);

                if ($inString !== '') {
                    echo "\t";
                }

                if ($inComment !== '') {
                    echo "\t";
                }

                echo "\tProcess char $i => $content (buffer: $bufferContent)".PHP_EOL;
            }//end if

            if ($inString === '' && $inComment === '' && $buffer !== '') {
                // If the buffer only has whitespace and we are about to
                // add a character, store the whitespace first.
                if (trim($char) !== '' && trim($buffer) === '') {
                    $tokens[] = array(
                                 'code'    => T_WHITESPACE,
                                 'type'    => 'T_WHITESPACE',
                                 'content' => str_replace("\n", $eolChar, $buffer),
                                );

                    if (PHP_CODESNIFFER_VERBOSITY > 1) {
                        $content = PHP_CodeSniffer::prepareForOutput($buffer);
                        echo "\t=> Added token T_WHITESPACE ($content)".PHP_EOL;
                    }

                    $buffer = '';
                }

                // If the buffer is not whitespace and we are about to
                // add a whitespace character, store the content first.
                if ($inString === ''
                    && $inComment === ''
                    && trim($char) === ''
                    && trim($buffer) !== ''
                ) {
                    $tokens[] = array(
                                 'code'    => T_STRING,
                                 'type'    => 'T_STRING',
                                 'content' => str_replace("\n", $eolChar, $buffer),
                                );

                    if (PHP_CODESNIFFER_VERBOSITY > 1) {
                        $content = PHP_CodeSniffer::prepareForOutput($buffer);
                        echo "\t=> Added token T_STRING ($content)".PHP_EOL;
                    }

                    $buffer = '';
                }
            }//end if

            // Process strings.
            if ($inComment === '' && isset($this->stringTokens[$char]) === true) {
                if ($inString === $char) {
                    // This could be the end of the string, but make sure it
                    // is not escaped first.
                    $escapes = 0;
                    for ($x = ($i - 1); $x >= 0; $x--) {
                        if ($chars[$x] !== '\\') {
                            break;
                        }

                        $escapes++;
                    }

                    if ($escapes === 0 || ($escapes % 2) === 0) {
                        // There is an even number escape chars,
                        // so this is not escaped, it is the end of the string.
                        $tokens[] = array(
                                     'code'    => T_CONSTANT_ENCAPSED_STRING,
                                     'type'    => 'T_CONSTANT_ENCAPSED_STRING',
                                     'content' => str_replace("\n", $eolChar, $buffer).$char,
                                    );

                        if (PHP_CODESNIFFER_VERBOSITY > 1) {
                            echo "\t\t* found end of string *".PHP_EOL;
                            $content = PHP_CodeSniffer::prepareForOutput($buffer.$char);
                            echo "\t=> Added token T_CONSTANT_ENCAPSED_STRING ($content)".PHP_EOL;
                        }

                        $buffer          = '';
                        $preStringBuffer = '';
                        $inString        = '';
                        $stringChar      = null;
                        continue;
                    }//end if
                } else if ($inString === '') {
                    $inString        = $char;
                    $stringChar      = $i;
                    $preStringBuffer = $buffer;

                    if (PHP_CODESNIFFER_VERBOSITY > 1) {
                        echo "\t\t* looking for string closer *".PHP_EOL;
                    }
                }//end if
            }//end if

            if ($inString !== '' && $char === "\n") {
                // Unless this newline character is escaped, the string did not
                // end before the end of the line, which means it probably
                // wasn't a string at all (maybe a regex).
                if ($chars[($i - 1)] !== '\\') {
                    $i      = $stringChar;
                    $buffer = $preStringBuffer;
                    $preStringBuffer = '';
                    $inString        = '';
                    $stringChar      = null;
                    $char            = $chars[$i];

                    if (PHP_CODESNIFFER_VERBOSITY > 1) {
                        echo "\t\t* found newline before end of string, bailing *".PHP_EOL;
                    }
                }
            }

            $buffer .= $char;

            // We don't look for special tokens inside strings,
            // so if we are in a string, we can continue here now
            // that the current char is in the buffer.
            if ($inString !== '') {
                continue;
            }

            // Special case for T_DIVIDE which can actually be
            // the start of a regular expression.
            if ($buffer === $char && $char === '/' && $chars[($i + 1)] !== '*') {
                $regex = $this->getRegexToken(
                    $i,
                    $string,
                    $chars,
                    $tokens,
                    $eolChar
                );

                if ($regex !== null) {
                    $tokens[] = array(
                                 'code'    => T_REGULAR_EXPRESSION,
                                 'type'    => 'T_REGULAR_EXPRESSION',
                                 'content' => $regex['content'],
                                );

                    if (PHP_CODESNIFFER_VERBOSITY > 1) {
                        $content = PHP_CodeSniffer::prepareForOutput($regex['content']);
                        echo "\t=> Added token T_REGULAR_EXPRESSION ($content)".PHP_EOL;
                    }

                    $i           = $regex['end'];
                    $buffer      = '';
                    $cleanBuffer = false;
                    continue;
                }//end if
            }//end if

            // Check for known tokens, but ignore tokens found that are not at
            // the end of a string, like FOR and this.FORmat.
            if (isset($this->tokenValues[strtolower($buffer)]) === true
                && (preg_match('|[a-zA-z0-9_]|', $char) === 0
                || isset($chars[($i + 1)]) === false
                || preg_match('|[a-zA-z0-9_]|', $chars[($i + 1)]) === 0)
            ) {
                $matchedToken    = false;
                $lookAheadLength = ($maxTokenLength - strlen($buffer));

                if ($lookAheadLength > 0) {
                    // The buffer contains a token type, but we need
                    // to look ahead at the next chars to see if this is
                    // actually part of a larger token. For example,
                    // FOR and FOREACH.
                    if (PHP_CODESNIFFER_VERBOSITY > 1) {
                        echo "\t\t* buffer possibly contains token, looking ahead $lookAheadLength chars *".PHP_EOL;
                    }

                    $charBuffer = $buffer;
                    for ($x = 1; $x <= $lookAheadLength; $x++) {
                        if (isset($chars[($i + $x)]) === false) {
                            break;
                        }

                        $charBuffer .= $chars[($i + $x)];

                        if (PHP_CODESNIFFER_VERBOSITY > 1) {
                            $content = PHP_CodeSniffer::prepareForOutput($charBuffer);
                            echo "\t\t=> Looking ahead $x chars => $content".PHP_EOL;
                        }

                        if (isset($this->tokenValues[strtolower($charBuffer)]) === true) {
                            // We've found something larger that matches
                            // so we can ignore this char. Except for 1 very specific
                            // case where a comment like /**/ needs to tokenize as
                            // T_COMMENT and not T_DOC_COMMENT.
                            $oldType = $this->tokenValues[strtolower($buffer)];
                            $newType = $this->tokenValues[strtolower($charBuffer)];
                            if ($oldType === 'T_COMMENT'
                                && $newType === 'T_DOC_COMMENT'
                                && $chars[($i + $x + 1)] === '/'
                            ) {
                                if (PHP_CODESNIFFER_VERBOSITY > 1) {
                                    echo "\t\t* look ahead ignored T_DOC_COMMENT, continuing *".PHP_EOL;
                                }
                            } else {
                                if (PHP_CODESNIFFER_VERBOSITY > 1) {
                                    echo "\t\t* look ahead found more specific token ($newType), ignoring $i *".PHP_EOL;
                                }

                                $matchedToken = true;
                                break;
                            }
                        }//end if
                    }//end for
                }//end if

                if ($matchedToken === false) {
                    if (PHP_CODESNIFFER_VERBOSITY > 1 && $lookAheadLength > 0) {
                        echo "\t\t* look ahead found nothing *".PHP_EOL;
                    }

                    $value    = $this->tokenValues[strtolower($buffer)];
                    $tokens[] = array(
                                 'code'    => constant($value),
                                 'type'    => $value,
                                 'content' => $buffer,
                                );

                    if (PHP_CODESNIFFER_VERBOSITY > 1) {
                        $content = PHP_CodeSniffer::prepareForOutput($buffer);
                        echo "\t=> Added token $value ($content)".PHP_EOL;
                    }

                    $cleanBuffer = true;
                }//end if
            } else if (isset($this->tokenValues[strtolower($char)]) === true) {
                // No matter what token we end up using, we don't
                // need the content in the buffer any more because we have
                // found a valid token.
                $newContent = substr(str_replace("\n", $eolChar, $buffer), 0, -1);
                if ($newContent !== '') {
                    $tokens[] = array(
                                 'code'    => T_STRING,
                                 'type'    => 'T_STRING',
                                 'content' => $newContent,
                                );

                    if (PHP_CODESNIFFER_VERBOSITY > 1) {
                        $content = PHP_CodeSniffer::prepareForOutput(substr($buffer, 0, -1));
                        echo "\t=> Added token T_STRING ($content)".PHP_EOL;
                    }
                }

                if (PHP_CODESNIFFER_VERBOSITY > 1) {
                    echo "\t\t* char is token, looking ahead ".($maxTokenLength - 1).' chars *'.PHP_EOL;
                }

                // The char is a token type, but we need to look ahead at the
                // next chars to see if this is actually part of a larger token.
                // For example, = and ===.
                $charBuffer   = $char;
                $matchedToken = false;
                for ($x = 1; $x <= $maxTokenLength; $x++) {
                    if (isset($chars[($i + $x)]) === false) {
                        break;
                    }

                    $charBuffer .= $chars[($i + $x)];

                    if (PHP_CODESNIFFER_VERBOSITY > 1) {
                        $content = PHP_CodeSniffer::prepareForOutput($charBuffer);
                        echo "\t\t=> Looking ahead $x chars => $content".PHP_EOL;
                    }

                    if (isset($this->tokenValues[strtolower($charBuffer)]) === true) {
                        // We've found something larger that matches
                        // so we can ignore this char.
                        if (PHP_CODESNIFFER_VERBOSITY > 1) {
                            $type = $this->tokenValues[strtolower($charBuffer)];
                            echo "\t\t* look ahead found more specific token ($type), ignoring $i *".PHP_EOL;
                        }

                        $matchedToken = true;
                        break;
                    }
                }//end for

                if ($matchedToken === false) {
                    $value    = $this->tokenValues[strtolower($char)];
                    $tokens[] = array(
                                 'code'    => constant($value),
                                 'type'    => $value,
                                 'content' => $char,
                                );

                    if (PHP_CODESNIFFER_VERBOSITY > 1) {
                        echo "\t\t* look ahead found nothing *".PHP_EOL;
                        $content = PHP_CodeSniffer::prepareForOutput($char);
                        echo "\t=> Added token $value ($content)".PHP_EOL;
                    }

                    $cleanBuffer = true;
                } else {
                    $buffer = $char;
                }//end if
            }//end if

            // Keep track of content inside comments.
            if ($inComment === ''
                && array_key_exists($buffer, $this->commentTokens) === true
            ) {
                // This is not really a comment if the content
                // looks like \// (i.e., it is escaped).
                if (isset($chars[($i - 2)]) === true && $chars[($i - 2)] === '\\') {
                    $lastToken   = array_pop($tokens);
                    $lastContent = $lastToken['content'];
                    if (PHP_CODESNIFFER_VERBOSITY > 1) {
                        $value   = $this->tokenValues[strtolower($lastContent)];
                        $content = PHP_CodeSniffer::prepareForOutput($lastContent);
                        echo "\t=> Removed token $value ($content)".PHP_EOL;
                    }

                    $lastChars    = str_split($lastContent);
                    $lastNumChars = count($lastChars);
                    for ($x = 0; $x < $lastNumChars; $x++) {
                        $lastChar = $lastChars[$x];
                        $value    = $this->tokenValues[strtolower($lastChar)];
                        $tokens[] = array(
                                     'code'    => constant($value),
                                     'type'    => $value,
                                     'content' => $lastChar,
                                    );

                        if (PHP_CODESNIFFER_VERBOSITY > 1) {
                            $content = PHP_CodeSniffer::prepareForOutput($lastChar);
                            echo "\t=> Added token $value ($content)".PHP_EOL;
                        }
                    }
                } else {
                    // We have started a comment.
                    $inComment = $buffer;

                    if (PHP_CODESNIFFER_VERBOSITY > 1) {
                        echo "\t\t* looking for end of comment *".PHP_EOL;
                    }
                }//end if
            } else if ($inComment !== '') {
                if ($this->commentTokens[$inComment] === null) {
                    // Comment ends at the next newline.
                    if (strpos($buffer, "\n") !== false) {
                        $inComment = '';
                    }
                } else {
                    if ($this->commentTokens[$inComment] === $buffer) {
                        $inComment = '';
                    }
                }

                if (PHP_CODESNIFFER_VERBOSITY > 1) {
                    if ($inComment === '') {
                        echo "\t\t* found end of comment *".PHP_EOL;
                    }
                }

                if ($inComment === '' && $cleanBuffer === false) {
                    $tokens[] = array(
                                 'code'    => T_STRING,
                                 'type'    => 'T_STRING',
                                 'content' => str_replace("\n", $eolChar, $buffer),
                                );

                    if (PHP_CODESNIFFER_VERBOSITY > 1) {
                        $content = PHP_CodeSniffer::prepareForOutput($buffer);
                        echo "\t=> Added token T_STRING ($content)".PHP_EOL;
                    }

                    $buffer = '';
                }
            }//end if

            if ($cleanBuffer === true) {
                $buffer      = '';
                $cleanBuffer = false;
            }
        }//end for

        if (empty($buffer) === false) {
            // Buffer contains whitespace from the end of the file.
            $tokens[] = array(
                         'code'    => T_WHITESPACE,
                         'type'    => 'T_WHITESPACE',
                         'content' => str_replace("\n", $eolChar, $buffer),
                        );

            if (PHP_CODESNIFFER_VERBOSITY > 1) {
                $content = PHP_CodeSniffer::prepareForOutput($buffer);
                echo "\t=> Added token T_WHITESPACE ($content)".PHP_EOL;
            }
        }

        $tokens[] = array(
                     'code'    => T_CLOSE_TAG,
                     'type'    => 'T_CLOSE_TAG',
                     'content' => '',
                    );

        /*
            Now that we have done some basic tokenizing, we need to
            modify the tokens to join some together and split some apart
            so they match what the PHP tokenizer does.
        */

        $finalTokens = array();
        $newStackPtr = 0;
        $numTokens   = count($tokens);
        for ($stackPtr = 0; $stackPtr < $numTokens; $stackPtr++) {
            $token = $tokens[$stackPtr];

            /*
                Look for comments and join the tokens together.
            */

            if ($token['code'] === T_COMMENT || $token['code'] === T_DOC_COMMENT) {
                $newContent   = '';
                $tokenContent = $token['content'];
                $endContent   = $this->commentTokens[$tokenContent];
                while ($tokenContent !== $endContent) {
                    if ($endContent === null
                        && strpos($tokenContent, $eolChar) !== false
                    ) {
                        // A null end token means the comment ends at the end of
                        // the line so we look for newlines and split the token.
                        $tokens[$stackPtr]['content'] = substr(
                            $tokenContent,
                            (strpos($tokenContent, $eolChar) + strlen($eolChar))
                        );

                        $tokenContent = substr(
                            $tokenContent,
                            0,
                            (strpos($tokenContent, $eolChar) + strlen($eolChar))
                        );

                        // If the substr failed, skip the token as the content
                        // will now be blank.
                        if ($tokens[$stackPtr]['content'] !== false
                            && $tokens[$stackPtr]['content'] !== ''
                        ) {
                            $stackPtr--;
                        }

                        break;
                    }//end if

                    $stackPtr++;
                    $newContent .= $tokenContent;
                    if (isset($tokens[$stackPtr]) === false) {
                        break;
                    }

                    $tokenContent = $tokens[$stackPtr]['content'];
                }//end while

                if ($token['code'] === T_DOC_COMMENT) {
                    $commentTokens = $commentTokenizer->tokenizeString($newContent.$tokenContent, $eolChar, $newStackPtr);
                    foreach ($commentTokens as $commentToken) {
                        $finalTokens[$newStackPtr] = $commentToken;
                        $newStackPtr++;
                    }

                    continue;
                } else {
                    // Save the new content in the current token so
                    // the code below can chop it up on newlines.
                    $token['content'] = $newContent.$tokenContent;
                }
            }//end if

            /*
                If this token has newlines in its content, split each line up
                and create a new token for each line. We do this so it's easier
                to ascertain where errors occur on a line.
                Note that $token[1] is the token's content.
            */

            if (strpos($token['content'], $eolChar) !== false) {
                $tokenLines = explode($eolChar, $token['content']);
                $numLines   = count($tokenLines);

                for ($i = 0; $i < $numLines; $i++) {
                    $newToken['content'] = $tokenLines[$i];
                    if ($i === ($numLines - 1)) {
                        if ($tokenLines[$i] === '') {
                            break;
                        }
                    } else {
                        $newToken['content'] .= $eolChar;
                    }

                    $newToken['type']          = $token['type'];
                    $newToken['code']          = $token['code'];
                    $finalTokens[$newStackPtr] = $newToken;
                    $newStackPtr++;
                }
            } else {
                $finalTokens[$newStackPtr] = $token;
                $newStackPtr++;
            }//end if

            // Convert numbers, including decimals.
            if ($token['code'] === T_STRING
                || $token['code'] === T_OBJECT_OPERATOR
            ) {
                $newContent  = '';
                $oldStackPtr = $stackPtr;
                while (preg_match('|^[0-9\.]+$|', $tokens[$stackPtr]['content']) !== 0) {
                    $newContent .= $tokens[$stackPtr]['content'];
                    $stackPtr++;
                }

                if ($newContent !== '' && $newContent !== '.') {
                    $finalTokens[($newStackPtr - 1)]['content'] = $newContent;
                    if (ctype_digit($newContent) === true) {
                        $finalTokens[($newStackPtr - 1)]['code']
                            = constant('T_LNUMBER');
                        $finalTokens[($newStackPtr - 1)]['type'] = 'T_LNUMBER';
                    } else {
                        $finalTokens[($newStackPtr - 1)]['code']
                            = constant('T_DNUMBER');
                        $finalTokens[($newStackPtr - 1)]['type'] = 'T_DNUMBER';
                    }

                    $stackPtr--;
                } else {
                    $stackPtr = $oldStackPtr;
                }
            }//end if

            // Convert the token after an object operator into a string, in most cases.
            if ($token['code'] === T_OBJECT_OPERATOR) {
                for ($i = ($stackPtr + 1); $i < $numTokens; $i++) {
                    if (isset(PHP_CodeSniffer_Tokens::$emptyTokens[$tokens[$i]['code']]) === true) {
                        continue;
                    }

                    if ($tokens[$i]['code'] !== T_PROTOTYPE
                        && $tokens[$i]['code'] !== T_LNUMBER
                        && $tokens[$i]['code'] !== T_DNUMBER
                    ) {
                        $tokens[$i]['code'] = T_STRING;
                        $tokens[$i]['type'] = 'T_STRING';
                    }

                    break;
                }
            }
        }//end for

        if (PHP_CODESNIFFER_VERBOSITY > 1) {
            echo "\t*** END TOKENIZING ***".PHP_EOL;
        }

        return $finalTokens;

    }//end tokenizeString()


    /**
     * Tokenizes a regular expression if one is found.
     *
     * If a regular expression is not found, NULL is returned.
     *
     * @param string $char    The index of the possible regex start character.
     * @param string $string  The complete content of the string being tokenized.
     * @param string $chars   An array of characters being tokenized.
     * @param string $tokens  The current array of tokens found in the string.
     * @param string $eolChar The EOL character to use for splitting strings.
     *
     * @return void
     */
    public function getRegexToken($char, $string, $chars, $tokens, $eolChar)
    {
        $beforeTokens = array(
                         T_EQUAL               => true,
                         T_OPEN_PARENTHESIS    => true,
                         T_OPEN_SQUARE_BRACKET => true,
                         T_RETURN              => true,
                         T_BOOLEAN_OR          => true,
                         T_BOOLEAN_AND         => true,
                         T_BITWISE_OR          => true,
                         T_BITWISE_AND         => true,
                         T_COMMA               => true,
                         T_COLON               => true,
                         T_TYPEOF              => true,
                        );

        $afterTokens = array(
                        ','      => true,
                        ')'      => true,
                        ']'      => true,
                        ';'      => true,
                        ' '      => true,
                        '.'      => true,
                        $eolChar => true,
                       );

        // Find the last non-whitespace token that was added
        // to the tokens array.
        $numTokens = count($tokens);
        for ($prev = ($numTokens - 1); $prev >= 0; $prev--) {
            if (isset(PHP_CodeSniffer_Tokens::$emptyTokens[$tokens[$prev]['code']]) === false) {
                break;
            }
        }

        if (isset($beforeTokens[$tokens[$prev]['code']]) === false) {
            return null;
        }

        // This is probably a regular expression, so look for the end of it.
        if (PHP_CODESNIFFER_VERBOSITY > 1) {
            echo "\t* token possibly starts a regular expression *".PHP_EOL;
        }

        $numChars = count($chars);
        for ($next = ($char + 1); $next < $numChars; $next++) {
            if ($chars[$next] === '/') {
                // Just make sure this is not escaped first.
                if ($chars[($next - 1)] !== '\\') {
                    // In the simple form: /.../ so we found the end.
                    break;
                } else if ($chars[($next - 2)] === '\\') {
                    // In the form: /...\\/ so we found the end.
                    break;
                }
            } else {
                $possibleEolChar = substr($string, $next, strlen($eolChar));
                if ($possibleEolChar === $eolChar) {
                    // This is the last token on the line and regular
                    // expressions need to be defined on a single line,
                    // so this is not a regular expression.
                    break;
                }
            }
        }

        if ($chars[$next] !== '/') {
            if (PHP_CODESNIFFER_VERBOSITY > 1) {
                echo "\t* could not find end of regular expression *".PHP_EOL;
            }

            return null;
        }

        while (preg_match('|[a-zA-Z]|', $chars[($next + 1)]) !== 0) {
            // The token directly after the end of the regex can
            // be modifiers like global and case insensitive
            // (.e.g, /pattern/gi).
            $next++;
        }

        $regexEnd = $next;
        if (PHP_CODESNIFFER_VERBOSITY > 1) {
            echo "\t* found end of regular expression at token $regexEnd *".PHP_EOL;
        }

        for ($next = ($next + 1); $next < $numChars; $next++) {
            if ($chars[$next] !== ' ') {
                break;
            } else {
                $possibleEolChar = substr($string, $next, strlen($eolChar));
                if ($possibleEolChar === $eolChar) {
                    // This is the last token on the line.
                    break;
                }
            }
        }

        if (isset($afterTokens[$chars[$next]]) === false) {
            if (PHP_CODESNIFFER_VERBOSITY > 1) {
                echo "\t* tokens after regular expression do not look correct *".PHP_EOL;
            }

            return null;
        }

        // This is a regular expression, so join all the tokens together.
        $content = '';
        for ($x = $char; $x <= $regexEnd; $x++) {
            $content .= $chars[$x];
        }

        $token = array(
                  'start'   => $char,
                  'end'     => $regexEnd,
                  'content' => $content,
                 );

        return $token;

    }//end getRegexToken()


    /**
     * Performs additional processing after main tokenizing.
     *
     * This additional processing looks for properties, closures, labels and objects.
     *
     * @param array  $tokens  The array of tokens to process.
     * @param string $eolChar The EOL character to use for splitting strings.
     *
     * @return void
     */
    public function processAdditional(&$tokens, $eolChar)
    {
        if (PHP_CODESNIFFER_VERBOSITY > 1) {
            echo "\t*** START ADDITIONAL JS PROCESSING ***".PHP_EOL;
        }

        $numTokens  = count($tokens);
        $classStack = array();

        for ($i = 0; $i < $numTokens; $i++) {
            if (PHP_CODESNIFFER_VERBOSITY > 1) {
                $type    = $tokens[$i]['type'];
                $content = PHP_CodeSniffer::prepareForOutput($tokens[$i]['content']);

                echo str_repeat("\t", count($classStack));
                echo "\tProcess token $i: $type => $content".PHP_EOL;
            }

            // Looking for functions that are actually closures.
            if ($tokens[$i]['code'] === T_FUNCTION && isset($tokens[$i]['scope_opener']) === true) {
                for ($x = ($i + 1); $x < $numTokens; $x++) {
                    if (isset(PHP_CodeSniffer_Tokens::$emptyTokens[$tokens[$x]['code']]) === false) {
                        break;
                    }
                }

                if ($tokens[$x]['code'] === T_OPEN_PARENTHESIS) {
                    $tokens[$i]['code'] = T_CLOSURE;
                    $tokens[$i]['type'] = 'T_CLOSURE';
                    if (PHP_CODESNIFFER_VERBOSITY > 1) {
                        $line = $tokens[$i]['line'];
                        echo str_repeat("\t", count($classStack));
                        echo "\t* token $i on line $line changed from T_FUNCTION to T_CLOSURE".PHP_EOL;
                    }

                    for ($x = ($tokens[$i]['scope_opener'] + 1); $x < $tokens[$i]['scope_closer']; $x++) {
                        if (isset($tokens[$x]['conditions'][$i]) === false) {
                            continue;
                        }

                        $tokens[$x]['conditions'][$i] = T_CLOSURE;
                        if (PHP_CODESNIFFER_VERBOSITY > 1) {
                            $type = $tokens[$x]['type'];
                            echo str_repeat("\t", count($classStack));
                            echo "\t\t* cleaned $x ($type) *".PHP_EOL;
                        }
                    }
                }//end if

                continue;
            } else if ($tokens[$i]['code'] === T_OPEN_CURLY_BRACKET
                && isset($tokens[$i]['scope_condition']) === false
            ) {
                $classStack[] = $i;

                $closer = $tokens[$i]['bracket_closer'];
                $tokens[$i]['code']      = T_OBJECT;
                $tokens[$i]['type']      = 'T_OBJECT';
                $tokens[$closer]['code'] = T_CLOSE_OBJECT;
                $tokens[$closer]['type'] = 'T_CLOSE_OBJECT';

                if (PHP_CODESNIFFER_VERBOSITY > 1) {
                    echo str_repeat("\t", count($classStack));
                    echo "\t* token $i converted from T_OPEN_CURLY_BRACKET to T_OBJECT *".PHP_EOL;
                    echo str_repeat("\t", count($classStack));
                    echo "\t* token $closer converted from T_CLOSE_CURLY_BRACKET to T_CLOSE_OBJECT *".PHP_EOL;
                }

                for ($x = ($i + 1); $x < $closer; $x++) {
                    $tokens[$x]['conditions'][$i] = T_OBJECT;
                    ksort($tokens[$x]['conditions'], SORT_NUMERIC);
                    if (PHP_CODESNIFFER_VERBOSITY > 1) {
                        $type = $tokens[$x]['type'];
                        echo str_repeat("\t", count($classStack));
                        echo "\t\t* added T_OBJECT condition to $x ($type) *".PHP_EOL;
                    }
                }
            } else if ($tokens[$i]['code'] === T_CLOSE_OBJECT) {
                $opener = array_pop($classStack);
            } else if ($tokens[$i]['code'] === T_COLON) {
                // If it is a scope opener, it belongs to a
                // DEFAULT or CASE statement.
                if (isset($tokens[$i]['scope_condition']) === true) {
                    continue;
                }

                // Make sure this is not part of an inline IF statement.
                for ($x = ($i - 1); $x >= 0; $x--) {
                    if ($tokens[$x]['code'] === T_INLINE_THEN) {
                        $tokens[$i]['code'] = T_INLINE_ELSE;
                        $tokens[$i]['type'] = 'T_INLINE_ELSE';

                        if (PHP_CODESNIFFER_VERBOSITY > 1) {
                            echo str_repeat("\t", count($classStack));
                            echo "\t* token $i converted from T_COLON to T_INLINE_THEN *".PHP_EOL;
                        }

                        continue(2);
                    } else if ($tokens[$x]['line'] < $tokens[$i]['line']) {
                        break;
                    }
                }

                // The string to the left of the colon is either a property or label.
                for ($label = ($i - 1); $label >= 0; $label--) {
                    if (isset(PHP_CodeSniffer_Tokens::$emptyTokens[$tokens[$label]['code']]) === false) {
                        break;
                    }
                }

                if ($tokens[$label]['code'] !== T_STRING
                    && $tokens[$label]['code'] !== T_CONSTANT_ENCAPSED_STRING
                ) {
                    continue;
                }

                if (empty($classStack) === false) {
                    $tokens[$label]['code'] = T_PROPERTY;
                    $tokens[$label]['type'] = 'T_PROPERTY';

                    if (PHP_CODESNIFFER_VERBOSITY > 1) {
                        echo str_repeat("\t", count($classStack));
                        echo "\t* token $label converted from T_STRING to T_PROPERTY *".PHP_EOL;
                    }
                } else {
                    $tokens[$label]['code'] = T_LABEL;
                    $tokens[$label]['type'] = 'T_LABEL';

                    if (PHP_CODESNIFFER_VERBOSITY > 1) {
                        echo str_repeat("\t", count($classStack));
                        echo "\t* token $label converted from T_STRING to T_LABEL *".PHP_EOL;
                    }
                }//end if
            }//end if
        }//end for

        if (PHP_CODESNIFFER_VERBOSITY > 1) {
            echo "\t*** END ADDITIONAL JS PROCESSING ***".PHP_EOL;
        }

    }//end processAdditional()


}//end class
