97 lines
2.5 KiB
PHP
97 lines
2.5 KiB
PHP
<?php
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namespace NoccyLabs\Dataset\Readers;
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use NoccyLabs\Dataset\ReaderInterface;
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class JsonReader implements ReaderInterface
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{
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private array $files = [];
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private array $options = [];
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private int $currentFile = 0;
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private ?int $loadedFile = null;
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private array $data = [];
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private int $currentIndex = 0;
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private int $counter = 0;
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public function __construct(string $filename, array $options)
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{
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$this->files = glob($filename);
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$this->options = $options;
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}
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private function checkLoadedSlice()
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{
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// If the current file is the loaded file, we're already set
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if ($this->currentFile === $this->loadedFile) return;
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if ($this->currentFile >= count($this->files)) {
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//printf("Reached end of set at slice=%d\n", $this->currentFile);
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return;
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}
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$flags = ($this->options['bigintAsString']??false)?JSON_BIGINT_AS_STRING:0;
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$file = $this->files[$this->currentFile];
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$json = @json_decode(@file_get_contents($file), true, 512, $flags);
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$this->loadData($json);
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$this->loadedFile = $this->currentFile;
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//printf("loaded slice %d: %s\n", $this->currentFile, $file);
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}
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private function loadData(array $data)
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{
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// FIXME parse data according to directives if present
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$this->data = $data;
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$this->currentIndex = 0;
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}
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public function rewind(): void
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{
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$this->currentFile = 0;
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$this->currentIndex = 0;
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$this->counter = 0;
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//printf("Rewinding to slice=%d index=%d\n", $this->currentFile, $this->currentIndex);
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$this->checkLoadedSlice();
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}
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public function key()
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{
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//$this->checkLoadedSlice();
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return $this->counter;
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}
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public function current()
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{
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//$this->checkLoadedSlice();
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return $this->data[$this->currentIndex];
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}
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public function next(): void
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{
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$this->counter++;
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$this->currentIndex++;
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if ($this->currentIndex >= count($this->data)) {
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$this->currentFile++;
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$this->currentIndex = 0;
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//printf("Rolling over to slice=%d index=%d counter=%d\n", $this->currentFile, $this->currentIndex, $this->counter);
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}
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//$this->checkLoadedSlice();
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}
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public function valid(): bool
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{
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$this->checkLoadedSlice();
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return ($this->currentFile < count($this->files) && ($this->currentIndex < count($this->data)));
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}
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}
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