24 lines
709 B
PHP
24 lines
709 B
PHP
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<?php
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namespace nur\mapper\base;
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use nur\b\ValueException;
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use nur\func;
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use Traversable;
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class producer_utils {
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static function ensure_producer($producer, ?array $args=null): iterable {
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if (is_array($producer) &&
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array_key_exists(0, $producer) &&
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is_subclass_of($producer[0], Producer::class)) {
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$producer = array_merge($producer, $args);
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return func::cons(...$producer);
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}
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if (is_iterable($producer)) return $producer;
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if (is_string($producer) && is_subclass_of($producer, Traversable::class)) {
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if ($args === null) $args = [];
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return func::cons($producer, ...$args);
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}
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throw ValueException::unexpected_type(Producer::class, $producer);
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}
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}
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