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<?php
/*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* This software consists of voluntary contributions made by many individuals
* and is licensed under the MIT license. For more information, see
* <http://www.doctrine-project.org>.
*/

namespace Doctrine\ORM\Query;

/**
* Scans a DQL query for tokens.
*
* @author Guilherme Blanco <guilhermeblanco@hotmail.com>
* @author Janne Vanhala <jpvanhal@cc.hut.fi>
* @author Roman Borschel <roman@code-factory.org>
* @since 2.0
*/
class Lexer extends \Doctrine\Common\Lexer
{
    // All tokens that are not valid identifiers must be < 100
    const T_NONE = 1;
    const T_INTEGER = 2;
    const T_STRING = 3;
    const T_INPUT_PARAMETER = 4;
    const T_FLOAT = 5;
    const T_CLOSE_PARENTHESIS = 6;
    const T_OPEN_PARENTHESIS = 7;
    const T_COMMA = 8;
    const T_DIVIDE = 9;
    const T_DOT = 10;
    const T_EQUALS = 11;
    const T_GREATER_THAN = 12;
    const T_LOWER_THAN = 13;
    const T_MINUS = 14;
    const T_MULTIPLY = 15;
    const T_NEGATE = 16;
    const T_PLUS = 17;
    const T_OPEN_CURLY_BRACE = 18;
    const T_CLOSE_CURLY_BRACE = 19;

    // All tokens that are also identifiers should be >= 100
    const T_IDENTIFIER = 100;
    const T_ALL = 101;
    const T_AND = 102;
    const T_ANY = 103;
    const T_AS = 104;
    const T_ASC = 105;
    const T_AVG = 106;
    const T_BETWEEN = 107;
    const T_BOTH = 108;
    const T_BY = 109;
    const T_CASE = 110;
    const T_COALESCE = 111;
    const T_COUNT = 112;
    const T_DELETE = 113;
    const T_DESC = 114;
    const T_DISTINCT = 115;
    const T_ELSE = 116;
    const T_EMPTY = 117;
    const T_END = 118;
    const T_ESCAPE = 119;
    const T_EXISTS = 120;
    const T_FALSE = 121;
    const T_FROM = 122;
    const T_GROUP = 123;
    const T_HAVING = 124;
    const T_HIDDEN = 125;
    const T_IN = 126;
    const T_INDEX = 127;
    const T_INNER = 128;
    const T_INSTANCE = 129;
    const T_IS = 130;
    const T_JOIN = 131;
    const T_LEADING = 132;
    const T_LEFT = 133;
    const T_LIKE = 134;
    const T_MAX = 135;
    const T_MEMBER = 136;
    const T_MIN = 137;
    const T_NOT = 138;
    const T_NULL = 139;
    const T_NULLIF = 140;
    const T_OF = 141;
    const T_OR = 142;
    const T_ORDER = 143;
    const T_OUTER = 144;
    const T_SELECT = 145;
    const T_SET = 146;
    const T_SOME = 147;
    const T_SUM = 148;
    const T_THEN = 149;
    const T_TRAILING = 150;
    const T_TRUE = 151;
    const T_UPDATE = 152;
    const T_WHEN = 153;
    const T_WHERE = 154;
    const T_WITH = 155;
    const T_PARTIAL = 156;
    const T_NEW = 157;

    /**
* Creates a new query scanner object.
*
* @param string $input A query string.
*/
    public function __construct($input)
    {
        $this->setInput($input);
    }

    /**
* @inheritdoc
*/
    protected function getCatchablePatterns()
    {
        return array(
            '[a-z_\\\][a-z0-9_\:\\\]*[a-z0-9_]{1}',
            '(?:[0-9]+(?:[\.][0-9]+)*)(?:e[+-]?[0-9]+)?',
            "'(?:[^']|'')*'",
            '\?[0-9]*|:[a-z_][a-z0-9_]*'
        );
    }

    /**
* @inheritdoc
*/
    protected function getNonCatchablePatterns()
    {
        return array('\s+', '(.)');
    }

    /**
* @inheritdoc
*/
    protected function getType(&$value)
    {
        $type = self::T_NONE;

        switch (true) {
            // Recognize numeric values
            case (is_numeric($value)):
                if (strpos($value, '.') !== false || stripos($value, 'e') !== false) {
                    return self::T_FLOAT;
                }

                return self::T_INTEGER;

            // Recognize quoted strings
            case ($value[0] === "'"):
                $value = str_replace("''", "'", substr($value, 1, strlen($value) - 2));

                return self::T_STRING;

            // Recognize identifiers
            case (ctype_alpha($value[0]) || $value[0] === '_'):
                $name = 'Doctrine\ORM\Query\Lexer::T_' . strtoupper($value);

                if (defined($name)) {
                    $type = constant($name);

                    if ($type > 100) {
                        return $type;
                    }
                }

                return self::T_IDENTIFIER;

            // Recognize input parameters
            case ($value[0] === '?' || $value[0] === ':'):
                return self::T_INPUT_PARAMETER;

            // Recognize symbols
            case ($value === '.'): return self::T_DOT;
            case ($value === ','): return self::T_COMMA;
            case ($value === '('): return self::T_OPEN_PARENTHESIS;
            case ($value === ')'): return self::T_CLOSE_PARENTHESIS;
            case ($value === '='): return self::T_EQUALS;
            case ($value === '>'): return self::T_GREATER_THAN;
            case ($value === '<'): return self::T_LOWER_THAN;
            case ($value === '+'): return self::T_PLUS;
            case ($value === '-'): return self::T_MINUS;
            case ($value === '*'): return self::T_MULTIPLY;
            case ($value === '/'): return self::T_DIVIDE;
            case ($value === '!'): return self::T_NEGATE;
            case ($value === '{'): return self::T_OPEN_CURLY_BRACE;
            case ($value === '}'): return self::T_CLOSE_CURLY_BRACE;

            // Default
            default:
                // Do nothing
        }

        return $type;
    }
}
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