93 lines
2.8 KiB
PHP
93 lines
2.8 KiB
PHP
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<?php
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namespace NoccyLabs\Dataset;
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use Iterator;
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class FilteringReaderIterator implements Iterator
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{
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private Iterator $reader;
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private $condition;
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public function __construct(Iterator $reader, array|callable $condition)
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{
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$this->reader = $reader;
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$this->condition = $condition;
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}
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public function current(): mixed
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{
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return $this->reader->current();
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}
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public function key(): mixed
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{
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return $this->reader->key();
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}
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public function valid(): bool
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{
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return $this->reader->valid();
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}
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public function next(): void
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{
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$this->reader->next();
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while ($this->reader->valid()) {
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$curr = $this->reader->current();
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if ($this->matchCondition($curr))
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break;
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$this->reader->next();
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}
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}
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public function rewind(): void
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{
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$this->reader->rewind();
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while ($this->reader->valid()) {
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$curr = $this->reader->current();
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if ($this->matchCondition($curr))
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break;
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$this->reader->next();
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}
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}
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/**
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* Test a condition against a row
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*
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* The matched conditions are:
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* - string/bool/int/float - match value
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* - array - all conditions in array must match:
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* - eq equals
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* - neq not equals
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* - gt greater than
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* - gte greater than or equal
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* - lt less than
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* - in value in array
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* - nin value not in array
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*/
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private function matchCondition(array $row): bool
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{
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if (is_callable($this->condition)) {
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return (bool)call_user_func($this->condition, $row);
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}
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foreach ($this->condition as $field=>$test) {
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if (!array_key_exists($field, $row)) continue;
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if (is_array($test)) {
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if (array_key_exists('eq',$test) && $row[$field] != $test['eq']) return false;
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if (array_key_exists('neq',$test) && $row[$field] == $test['neq']) return false;
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if (array_key_exists('gt',$test) && $row[$field] <= $test['gt']) return false;
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if (array_key_exists('gte',$test) && $row[$field] < $test['gte']) return false;
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if (array_key_exists('lt',$test) && $row[$field] >= $test['lt']) return false;
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if (array_key_exists('lte',$test) && $row[$field] > $test['lte']) return false;
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if (array_key_exists('in',$test) && !in_array($row[$field], $test['in'])) return false;
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if (array_key_exists('nin',$test) && in_array($row[$field], $test['in'])) return false;
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} else {
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if ($row[$field] != $test) return false;
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}
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}
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return true;
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}
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}
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