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Arsse/lib/Misc/ValueInfo.php
2017-10-07 12:44:53 -04:00

104 lines
3.6 KiB
PHP

<?php
declare(strict_types=1);
namespace JKingWeb\Arsse\Misc;
class ValueInfo {
// universal
const VALID = 1 << 0;
const NULL = 1 << 1;
// integers
const ZERO = 1 << 2;
const NEG = 1 << 3;
// strings
const EMPTY = 1 << 2;
const WHITE = 1 << 3;
public static function int($value): int {
$out = 0;
if (is_null($value)) {
// check if the input is null
return self::NULL;
} elseif (is_string($value) || (is_object($value) && method_exists($value, "__toString"))) {
$value = (string) $value;
// normalize a string an integer or float if possible
if (!strlen($value)) {
// the empty string is equivalent to null when evaluating an integer
return self::NULL;
} elseif (filter_var($value, \FILTER_VALIDATE_FLOAT) !== false && !fmod((float) $value, 1)) {
// an integral float is acceptable
$value = (int) $value;
} else {
return $out;
}
} elseif (is_float($value) && !fmod($value, 1)) {
// an integral float is acceptable
$value = (int) $value;
} elseif (!is_int($value)) {
// if the value is not an integer or integral float, stop
return $out;
}
// mark validity
$out += self::VALID;
// mark zeroness
if ($value==0) {
$out += self::ZERO;
}
// mark negativeness
if ($value < 0) {
$out += self::NEG;
}
return $out;
}
public static function str($value): int {
$out = 0;
// check if the input is null
if (is_null($value)) {
$out += self::NULL;
}
if (is_object($value) && method_exists($value, "__toString")) {
// if the value is an object which has a __toString method, this is acceptable
$value = (string) $value;
} elseif (!is_scalar($value) || is_bool($value) || (is_float($value) && !is_finite($value))) {
// otherwise if the value is not scalar, is a boolean, or is infinity or NaN, it cannot be valid
return $out;
}
// mark validity
$out += self::VALID;
if (!strlen((string) $value)) {
// mark emptiness
$out += self::EMPTY;
} elseif (!strlen(trim((string) $value))) {
// mark whitespacedness
$out += self::WHITE;
}
return $out;
}
public static function id($value, bool $allowNull = false): bool {
$info = self::int($value);
if ($allowNull && ($info & self::NULL)) { // null (and allowed)
return true;
} elseif (!($info & self::VALID)) { // not an integer
return false;
} elseif ($info & self::NEG) { // negative integer
return false;
} elseif (!$allowNull && ($info & self::ZERO)) { // zero (and not allowed)
return false;
} else { // non-negative integer
return true;
}
}
public static function bool($value, bool $default = null) {
if (is_null($value) || ValueInfo::str($value) & ValueInfo::WHITE) {
return $default;
}
$out = filter_var($value, \FILTER_VALIDATE_BOOLEAN, \FILTER_NULL_ON_FAILURE);
if (is_null($out) && (ValueInfo::int($value) & ValueInfo::VALID)) {
$out = abs((int) filter_var($value, \FILTER_VALIDATE_FLOAT));
return ($out < 2) ? (bool) $out : $default;
}
return !is_null($out) ? $out : $default;
}
}