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Edit File: StringConstraint.php

<?php

/*
 * This file is part of the JsonSchema package.
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace JsonSchema\Constraints;

use JsonSchema\Entity\JsonPointer;

/**
 * The StringConstraint Constraints, validates an string against a given schema
 *
 * @author Robert Schönthal <seroscho@googlemail.com>
 * @author Bruno Prieto Reis <bruno.p.reis@gmail.com>
 */
class StringConstraint extends Constraint
{
    /**
     * {@inheritdoc}
     */
    public function check(&$element, $schema = null, JsonPointer $path = null, $i = null)
    {
        // Verify maxLength
        if (isset($schema->maxLength) && $this->strlen($element) > $schema->maxLength) {
            $this->addError($path, 'Must be at most ' . $schema->maxLength . ' characters long', 'maxLength', array(
                'maxLength' => $schema->maxLength,
            ));
        }

//verify minLength
        if (isset($schema->minLength) && $this->strlen($element) < $schema->minLength) {
            $this->addError($path, 'Must be at least ' . $schema->minLength . ' characters long', 'minLength', array(
                'minLength' => $schema->minLength,
            ));
        }

// Verify a regex pattern
        if (isset($schema->pattern) && !preg_match('#' . str_replace('#', '\\#', $schema->pattern) . '#u', $element)) {
            $this->addError($path, 'Does not match the regex pattern ' . $schema->pattern, 'pattern', array(
                'pattern' => $schema->pattern,
            ));
        }

$this->checkFormat($element, $schema, $path, $i);
    }

private function strlen($string)
    {
        if (extension_loaded('mbstring')) {
            return mb_strlen($string, mb_detect_encoding($string));
        }

// mbstring is present on all test platforms, so strlen() can be ignored for coverage
        return strlen($string); // @codeCoverageIgnore
    }
}