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<?php |
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/** |
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* This file is part of graze/csv-token |
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* |
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* Copyright (c) 2016 Nature Delivered Ltd. <https://www.graze.com> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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* |
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* @license https://github.com/graze/csv-token/blob/master/LICENSE.md |
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* @link https://github.com/graze/csv-token |
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*/ |
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namespace Graze\CsvToken\Tokeniser; |
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use Graze\CsvToken\Csv\Bom; |
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use Graze\CsvToken\Csv\CsvConfigurationInterface; |
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use Graze\CsvToken\Tokeniser\Token\Token; |
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use Graze\CsvToken\Tokeniser\Token\TokenStore; |
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use Iterator; |
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use Psr\Http\Message\StreamInterface; |
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class StreamTokeniser implements TokeniserInterface |
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{ |
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use StateBuilder; |
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/** @var int */ |
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private $maxTypeLength; |
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/** @var StreamInterface */ |
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private $stream; |
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/** @var State */ |
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private $state; |
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/** @var TokenStore */ |
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private $tokenStore; |
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/** |
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* Tokeniser constructor. |
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* |
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* @param CsvConfigurationInterface $config |
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* @param StreamInterface $stream |
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*/ |
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public function __construct(CsvConfigurationInterface $config, StreamInterface $stream) |
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{ |
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$this->tokenStore = new TokenStore($config); |
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$this->state = $this->buildStates($this->tokenStore); |
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$types = $this->tokenStore->getTokens(); |
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$this->maxTypeLength = count($types) > 0 ? strlen(array_keys($types)[0]) : 1; |
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$this->stream = $stream; |
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} |
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/** |
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* Loop through the stream, pulling maximum type length each time, find the largest type that matches and create a |
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* token, then move on length characters |
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* |
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* @return Iterator |
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*/ |
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public function getTokens() |
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{ |
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$this->stream->rewind(); |
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$position = $this->stream->tell(); |
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$buffer = $this->stream->read($this->maxTypeLength); |
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/** @var Token $last */ |
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$last = null; |
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while (strlen($buffer) > 0) { |
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$token = $this->state->match($position, $buffer); |
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if ($token->getType() == Token::T_BOM) { |
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$this->changeEncoding($token); |
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} |
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$this->state = $this->state->getNextState($token->getType()); |
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$len = $token->getLength(); |
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// merge tokens together to condense T_CONTENT tokens |
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if ($token->getType() == Token::T_CONTENT) { |
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$last = (!is_null($last)) ? $last->addContent($token->getContent()) : $token; |
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} else { |
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if (!is_null($last)) { |
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yield $last; |
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$last = null; |
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} |
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yield $token; |
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} |
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$position += $len; |
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$buffer = substr($buffer, $len) . $this->stream->read($len); |
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} |
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if (!is_null($last)) { |
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yield $last; |
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} |
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$this->stream->close(); |
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} |
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/** |
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* @param Token $token |
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*/ |
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private function changeEncoding(Token $token) |
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{ |
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$this->tokenStore->setEncoding(Bom::getEncoding($token->getContent())); |
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} |
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} |
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graze /
csv-token
