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Database.php
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Database.php
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<?php
namespace FpDbTest;
use InvalidArgumentException;
use mysqli;
class Database implements DatabaseInterface
{
private mysqli $mysqli;
private const /*string*/ UNEXPECTED_VARIABLE_PATTERN = 'Unexpected variable for modifier `%s` -> passed `%s`';
private const /*mixed*/ SKIP_VALUE = null;
public function __construct(mysqli $mysqli)
{
$this->mysqli = $mysqli;
}
public function buildQuery(string $query, array $args = []): string
{
$regex = '/({.*?}|\?d|\?f|\?a|\?#|\?)/';
$parts = preg_split($regex, $query, -1, PREG_SPLIT_DELIM_CAPTURE);
if (($expectedCount = intdiv(count($parts), 2)) !== ($passedCount = count($args))) {
throw new InvalidArgumentException(sprintf("query expect %d arguments but %d passed.", $expectedCount, $passedCount));
}
foreach ($args as $i => $arg) {
$part = &$parts[$i * 2 + 1];
if ($part[0] == '?') {
$part = $this->parseVariable($part, $arg);
} elseif ($part[0] == '{') {
if ($arg === self::SKIP_VALUE) {
$part = '';
continue;
}
$modPos = strpos($part, '?');
$mod = $part[$modPos + 1];
if (in_array($mod, ['d', 'f', 'a', '#'])) {
$mod = '?' . $mod;
}
$variable = $this->parseVariable($mod, $arg);
$part = substr(substr_replace($part, $variable, $modPos, strlen($mod)), 1, -1);
} else {
throw new InvalidArgumentException('Probably invalid query string.');
}
}
return (implode('', $parts));
}
function parseVariable(string $modifier, $variable): float|int|string
{
return match ($modifier) {
'?d' => $this->parseInt($variable),
'?f' => $this->parseFloat($variable),
'?#' => $this->parseIdentifiers($variable),
'?a' => $this->parseArray($variable),
'?' => $this->parseBase($variable),
default => throw new InvalidArgumentException("Unexpected modifier: `$modifier`"),
};
}
function parseInt($variable): int
{
return match (true) {
is_null($variable) => 'NULL',
is_int($variable) => $variable,
is_bool($variable) => intval($variable),
($result = intval($variable)) == $variable => $result,
default => throw new InvalidArgumentException(sprintf(self::UNEXPECTED_VARIABLE_PATTERN, '?d', $variable)),
};
}
function parseFloat($variable): float
{
return match (true) {
is_null($variable) => 'NULL',
is_float($variable) => $variable,
is_bool($variable), is_numeric($variable) => intval($variable),
default => throw new InvalidArgumentException(sprintf(self::UNEXPECTED_VARIABLE_PATTERN, '?f', $variable)),
};
}
function parseIdentifiers($variable): string
{
if (!is_string($variable) && (!is_array($variable) || !array_is_list($variable))) {
throw new InvalidArgumentException(sprintf(self::UNEXPECTED_VARIABLE_PATTERN, '?#', $variable));
}
if (is_array($variable)) {
$variable = implode('`, `', $variable);
}
return "`$variable`";
}
function parseArray($variable): string
{
if (!is_array($variable)) {
throw new InvalidArgumentException(sprintf(self::UNEXPECTED_VARIABLE_PATTERN, '?a', $variable));
}
try {
if (array_is_list($variable)) {
$result = array_map(function ($v) {
return $this->parseBase($v);
}, $variable);
} else {
$result = array_map(function ($key, $value) {
return sprintf("`$key` = %s", $this->parseBase($value));
}, array_keys($variable), array_values($variable));
}
} catch (InvalidArgumentException $e) {
throw new InvalidArgumentException('Only scalar values supported in array for `?a` modifier.', 0, $e);
}
return implode(', ', $result);
}
function parseBase($variable): float|int|string
{
return match (true) {
is_string($variable) => sprintf('\'%s\'', $variable),
is_int($variable), is_float($variable) => $variable,
is_bool($variable) => $variable ? 1 : 0,
is_null($variable) => 'NULL',
default => throw new InvalidArgumentException(sprintf(self::UNEXPECTED_VARIABLE_PATTERN, '?', $variable)),
};
}
public function skip(): mixed
{
return self::SKIP_VALUE;
}
}