Aura\Filter\Rule\Sanitize\Double

Complexity

Total Complexity

6

Size/Duplication

Total Lines	79
Duplicated Lines	0 %

Coupling/Cohesion

Components	0
Dependencies	0

Test Coverage

Coverage

100%

Importance

Changes

0

1 Method

Rating	Name	Duplication	Size	Complexity
B	__invoke()	0	59	6

<?php
/**
 *
 * This file is part of Aura for PHP.
 *
 * @license http://opensource.org/licenses/bsd-license.php BSD
 *
 */
namespace Aura\Filter\Rule\Sanitize;

/**
 *
 * Forces the value to a float.
 *
 * @package Aura.Filter
 *
 */
class Double
{
    /**
     *
     * Forces the value to a float.
     *
     * Attempts to extract a valid float from the given value, using an
     * algorithm somewhat less naive that "remove all characters that are not
     * '0-9.,eE+-'".  The result may not be expected, but it will be a float.
     *
     * @param object $subject The subject to be filtered.
     *
     * @param string $field The subject field name.
     *
     * @return bool True if the value was sanitized, false if not.
     *
     * @todo Extract scientific notation from weird strings?
     *
     */
    public function __invoke($subject, $field)
    {
        $value = $subject->$field;

        if (is_float($value)) {
            // already a float, nothing to do
            return true;
        }

        if (is_numeric($value)) {
            // numeric string, cast to a float
            $subject->$field = (float) $value;
            return true;
        }

        if (! is_string($value)) {
            // not a string, cannot sanitize
            return false;
        }

        // it's a non-numeric string, attempt to extract a float from it.
        // remove all + signs; any - sign takes precedence because ...
        //     0 + -1 = -1
        //     0 - +1 = -1
        // ... at least it seems that way to me now.
        $value = str_replace('+', '', $value);

        // reduce multiple decimals and minuses
        $value = preg_replace('/[\.-]{2,}/', '.', $value);

        // remove all decimals without a digit or minus next to them
        $value = preg_replace('/([^0-9-]\.[^0-9])/', '', $value);

        // remove all chars except digit, decimal, and minus
        $value = preg_replace('/[^0-9\.-]/', '', $value);

        // remove all trailing decimals and minuses
        $value = rtrim($value, '.-');

        // remove all minuses not at the front
        $is_negative = ($value[0] == '-');
        $value = str_replace('-', '', $value);
        if ($is_negative) {
            $value = '-' . $value;
        }

        // remove all decimals but the first
        $pos = strpos($value, '.');
        $value = str_replace('.', '', $value);
        if ($pos !== false) {
            $value = substr($value, 0, $pos)
                   . '.'
                   . substr($value, $pos);
        }

        // done
        $subject->$field = (float) $value;
        return true;
    }
}