mirror of
https://code.mensbeam.com/MensBeam/Arsse.git
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1271a0c8c0
This method provides generalized, consistent type casting more versatile than PHP's basic type juggling while hiding the significant complexity in achieving this. While this commit does not change any existing code to use the new method, the intent is for both API handlers and database drivers to use the same basic rules for type conversion while still allowing for differing failure modes.
343 lines
15 KiB
PHP
343 lines
15 KiB
PHP
<?php
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declare(strict_types=1);
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namespace JKingWeb\Arsse\Misc;
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use JKingWeb\Arsse\ExceptionType;
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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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const FLOAT = 1 << 4;
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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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//normalization types
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const T_MIXED = 0; // pass through unchanged
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const T_NULL = 1; // convert to null
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const T_BOOL = 2; // convert to boolean
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const T_INT = 3; // convert to integer
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const T_FLOAT = 4; // convert to floating point
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const T_DATE = 5; // convert to DateTimeInterface instance
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const T_STRING = 6; // convert to string
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const T_ARRAY = 7; // convert to array
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//normalization modes
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const M_NULL = 1 << 28; // pass nulls through regardless of target type
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const M_DROP = 1 << 29; // drop the value (return null) if the type doesn't match
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const M_STRICT = 1 << 30; // throw an exception if the type doesn't match
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const M_ARRAY = 1 << 31; // the value should be a flat array of values of the specified type; indexed and associative are both acceptable
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public function normalize($value, int $type, string $dateFormat = null) {
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$allowNull = ($type & self::M_NULL);
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$strict = ($type & (self::M_STRICT | self::M_DROP));
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$drop = ($type & self::M_DROP);
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$arrayVal = ($type & self::M_ARRAY);
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$type = ($type & ~(self::M_NULL | self::M_DROP | self::M_STRICT | self::M_ARRAY));
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// if the value is null and this is allowed, simply return
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if ($allowNull && is_null($value)) {
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return null;
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}
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// if the value is supposed to be an array, handle it specially
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if ($arrayVal) {
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$value = self::normalize($value, self::T_ARRAY);
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foreach ($value as $key => $v) {
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$value[$key] = self::normalize($v, $type | ($allowNull ? self::M_NULL : 0) | ($strict ? self::M_STRICT : 0) | ($drop ? self::M_DROP : 0), $dateFormat);
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}
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return $value;
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}
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switch ($type) {
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case self::T_MIXED:
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return $value;
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case self::T_NULL:
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return null;
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case self::T_BOOL:
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if (is_bool($value)) {
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return $value;
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}
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$out = self::bool($value);
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if ($strict && is_null($out)) {
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// if strict and input is not a boolean, this is an error
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if ($drop) {
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return null;
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}
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throw new ExceptionType("strictFailure", $type);
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} elseif (is_float($value) && is_nan($value)) {
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return false;
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} elseif (is_null($out)) {
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// if not strict and input is not a boolean, return a simple type-cast
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return (bool) $value;
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}
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return $out;
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case self::T_INT:
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if (is_int($value)) {
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return $value;
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} elseif ($value instanceof \DateTimeInterface) {
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if ($strict && !$drop) {
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throw new ExceptionType("strictFailure", $type);
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}
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return (!$drop) ? (int) $value->getTimestamp(): null;
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}
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$info = self::int($value);
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if ($strict && !($info & self::VALID)) {
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// if strict and input is not an integer, this is an error
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if ($drop) {
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return null;
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}
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throw new ExceptionType("strictFailure", $type);
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} elseif (is_bool($value)) {
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return (int) $value;
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} elseif ($info & (self::VALID | self::FLOAT)) {
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$out = strtolower((string) $value);
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if (strpos($out, "e")) {
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return (int) (float) $out;
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} else {
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return (int) $out;
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}
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} else {
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return 0;
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}
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case self::T_FLOAT:
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if (is_float($value)) {
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return $value;
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} elseif ($value instanceof \DateTimeInterface) {
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if ($strict && !$drop) {
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throw new ExceptionType("strictFailure", $type);
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}
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return (!$drop) ? (float) $value->getTimestamp(): null;
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} elseif (is_bool($value) && $strict) {
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if ($drop) {
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return null;
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}
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throw new ExceptionType("strictFailure", $type);
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}
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$out = filter_var($value, \FILTER_VALIDATE_FLOAT);
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if ($strict && $out===false) {
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// if strict and input is not a float, this is an error
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if ($drop) {
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return null;
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}
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throw new ExceptionType("strictFailure", $type);
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}
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return (float) $out;
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case self::T_STRING:
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if (is_string($value)) {
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return $value;
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}
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if ($value instanceof \DateTimeImmutable) {
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return $value->setTimezone(new \DateTimeZone("UTC"))->format(Date::FORMAT['iso8601'][1]);
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} elseif ($value instanceof \DateTime) {
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$out = clone $value;
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$out->setTimezone(new \DateTimeZone("UTC"));
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return $out->format(Date::FORMAT['iso8601'][1]);
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} elseif (is_float($value) && is_finite($value)) {
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$out = (string) $value;
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if(!strpos($out, "E")) {
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return $out;
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} else {
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$out = sprintf("%F", $value);
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return substr($out, -2)==".0" ? (string) (int) $out : $out;
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}
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}
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$info = self::str($value);
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if (!($info & self::VALID)) {
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if ($drop) {
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return null;
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} elseif ($strict) {
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// if strict and input is not a string, this is an error
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throw new ExceptionType("strictFailure", $type);
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} elseif (!is_scalar($value)) {
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return "";
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} else {
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return (string) $value;
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}
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} else {
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return (string) $value;
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}
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case self::T_DATE:
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if ($value instanceof \DateTimeImmutable) {
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return $value->setTimezone(new \DateTimeZone("UTC"));
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} elseif ($value instanceof \DateTime) {
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$out = clone $value;
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$out->setTimezone(new \DateTimeZone("UTC"));
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return $out;
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} elseif (is_int($value)) {
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return \DateTime::createFromFormat("U", (string) $value, new \DateTimeZone("UTC"));
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} elseif (is_float($value)) {
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return \DateTime::createFromFormat("U.u", sprintf("%F", $value), new \DateTimeZone("UTC"));
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} elseif (is_string($value)) {
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try {
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if (!is_null($dateFormat)) {
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$out = false;
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if ($dateFormat=="microtime") {
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// PHP is not able to correctly handle the output of microtime() as the input of DateTime::createFromFormat(), so we fudge it to look like a float
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if (preg_match("<^0\.\d{6}00 \d+$>", $value)) {
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$value = substr($value,11).".".substr($value,2,6);
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} else {
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throw new \Exception;
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}
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}
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$f = isset(Date::FORMAT[$dateFormat]) ? Date::FORMAT[$dateFormat][0] : $dateFormat;
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if ($dateFormat=="iso8601" || $dateFormat=="iso8601m") {
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// DateTime::createFromFormat() doesn't provide one catch-all for ISO 8601 timezone specifiers, so we try all of them till one works
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if ($dateFormat=="iso8601m") {
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$f2 = Date::FORMAT["iso8601"][0];
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$zones = [$f."", $f."\Z", $f."P", $f."O", $f2."", $f2."\Z", $f2."P", $f2."O"];
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} else {
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$zones = [$f."", $f."\Z", $f."P", $f."O"];
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}
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do {
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$ftz = array_shift($zones);
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$out = \DateTime::createFromFormat($ftz, $value, new \DateTimeZone("UTC"));
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} while (!$out && $zones);
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} else {
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$out = \DateTime::createFromFormat($f, $value, new \DateTimeZone("UTC"));
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}
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if (!$out) {
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throw new \Exception;
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}
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return $out;
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} else {
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return new \DateTime($value, new \DateTimeZone("UTC"));
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}
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} catch (\Exception $e) {
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if ($strict && !$drop) {
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throw new ExceptionType("strictFailure", $type);
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}
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return null;
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}
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} elseif ($strict && !$drop) {
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throw new ExceptionType("strictFailure", $type);
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}
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return null;
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case self::T_ARRAY:
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if (is_array($value)) {
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return $value;
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} elseif ($value instanceof \Traversable) {
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$out = [];
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foreach ($value as $k => $v) {
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$out[$k] = $v;
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}
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return $out;
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} else {
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if ($drop) {
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return null;
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} elseif ($strict) {
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// if strict and input is not a string, this is an error
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throw new ExceptionType("strictFailure", $type);
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} elseif (is_null($value) || (is_float($value) && is_nan($value))) {
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return [];
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} else {
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return [$value];
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}
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}
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default:
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throw new ExceptionType("typeUnknown", $type); // @codeCoverageIgnore
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}
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}
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public static function int($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 = strtolower((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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}
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// interpret the value as a float
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$float = filter_var($value, \FILTER_VALIDATE_FLOAT);
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if ($float !== false) {
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if (!fmod($float, 1)) {
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// an integral float is acceptable
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$value = (int) (!strpos($value, "e") ? $value : $float);
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} else {
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$out += self::FLOAT;
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$value = $float;
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}
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} else {
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return $out;
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}
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} elseif (is_float($value)) {
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if (!fmod($value, 1)) {
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// an integral float is acceptable
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$value = (int) $value;
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} else {
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$out += self::FLOAT;
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}
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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 $out;
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}
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// mark validity
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if (is_int($value)) {
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$out += self::VALID;
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}
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// mark zeroness
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if (!$value) {
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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 && ($info & self::ZERO)) { // zero (and not allowed)
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return false;
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} else { // non-negative integer
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return true;
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}
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}
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public static function bool($value, bool $default = null) {
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if (is_null($value) || ValueInfo::str($value) & ValueInfo::WHITE) {
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return $default;
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}
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$out = filter_var($value, \FILTER_VALIDATE_BOOLEAN, \FILTER_NULL_ON_FAILURE);
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if (is_null($out) && (ValueInfo::int($value) & ValueInfo::VALID)) {
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$out = (int) filter_var($value, \FILTER_VALIDATE_FLOAT);
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return ($out==1 || $out==0) ? (bool) $out : $default;
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}
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return !is_null($out) ? $out : $default;
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}
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}
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