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