YetiForceCompany/YetiForceCRM

<?php
/* +*******************************************************************************
 * The contents of this file are subject to the vtiger CRM Public License Version 1.0
 * ("License"); You may not use this file except in compliance with the License
 * The Original Code is:  vtiger CRM Open Source
 * The Initial Developer of the Original Code is vtiger.
 * Portions created by vtiger are Copyright (C) vtiger.
 * All Rights Reserved.
 * **************************************************************************** */

class VTExpressionTokenizer
{
    public function __construct($expr)
    {
        $tokenTypes = [
            'SPACE' => ['\s+', 'processTokenId'],
            'SYMBOL' => ['[a-zA-Z][\w]*', 'processTokenSymbol'],
            'ESCAPED_SYMBOL' => ['?:`([^`]+)`', 'processTokenSymbol'],
            //"STRING" => array('?:(?:"((?:\\\\"|[^"])+)"|'."'((?:\\\\'|[^'])+)')", 'stripcslashes'),
            //"STRING" => array('?:"((?:\\\\"|[^"])+)"', 'stripcslashes'),
            'STRING' => ["?:'((?:\\\\'|[^'])+)'", 'stripcslashes'],
            'FLOAT' => ['\d+[.]\d+', 'floatval'],
            'INTEGER' => ['\d+', 'intval'],
            'OPERATOR' => ['[+]|[-]|[*]|>=|<=|[<]|[>]|==|\/', 'processTokenSymbol'],
            // NOTE: Any new Operator added should be updated in VTParser.inc::$precedence and operation at VTExpressionEvaluater
            'OPEN_BRACKET' => ['[(]', 'processTokenSymbol'],
            'CLOSE_BRACKET' => ['[)]', 'processTokenSymbol'],
            'COMMA' => ['[,]', 'processTokenSymbol'],
        ];
        $tokenReArr = [];
        $tokenNames = [];
        $this->tokenTypes = $tokenTypes;

        foreach ($tokenTypes as $tokenName => $code) {
            [$re] = $code;
            $tokenReArr[] = '(' . $re . ')';
            $tokenNames[] = $tokenName;
        }
        $this->tokenNames = $tokenNames;
        $tokenRe = '/' . implode('|', $tokenReArr) . '/';
        $this->EOF = new VTExpressionToken('EOF');

        $matches = [];
        preg_match_all($tokenRe, App\Purifier::decodeHtml($expr), $matches, PREG_SET_ORDER);
        $this->matches = $matches;
        $this->idx = 0;
    }

    public function nextToken()
    {
        $matches = $this->matches;
        $idx = $this->idx;
        if ($idx == \count($matches)) {
            return $this->EOF;
        }
        $match = $matches[$idx];
        $this->idx = $idx + 1;
        $i = 1;
        while (empty($match[$i])) {
            ++$i;
        }
        $tokenName = $this->tokenNames[$i - 1];
        $token = new VTExpressionToken($tokenName);
        if (method_exists($this, $this->tokenTypes[$tokenName][1])) {
            $token->value = \call_user_func([$this, $this->tokenTypes[$tokenName][1]], $match[$i]);
        } else {
            $token->value = $this->tokenTypes[$tokenName][1]($match[$i]);
        }

        return $token;
    }

    public function tests($token)
    {
        $this->processTokenId($token);
        $this->processTokenSymbol($token);
    }

    private function processTokenId($token)
    {
        return $token;
    }

    private function processTokenSymbol($token)
    {
        return new VTEXpressionSymbol($token);
    }
}