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<?php |
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/** |
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* CSVelte: Slender, elegant CSV for PHP |
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* |
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* Inspired by Python's CSV module and Frictionless Data and the W3C's CSV |
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* standardization efforts, CSVelte was written in an effort to take all the |
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* suck out of working with CSV. |
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* |
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* @copyright Copyright (c) 2018 Luke Visinoni |
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* @author Luke Visinoni <[email protected]> |
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* @license See LICENSE file (MIT license) |
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*/ |
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namespace CSVelte\Traits; |
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use CSVelte\Exception\IOException; |
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/** |
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* IO IsReadable Trait. |
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* |
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* Read methods shared between CSVelte\IO classes. |
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*/ |
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trait IsReadable |
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{ |
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/** |
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* Read single line. |
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* Read the next line from the file (moving the internal pointer down a line). |
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* Returns multiple lines if newline character(s) fall within a quoted string. |
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* |
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* @param string|array $eol A string or array of strings to be used as EOL char/sequence |
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* @param int $maxLength Maximum number of bytes to return (line will be truncated to this -1 if set) |
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* |
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* @throws IOException |
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* |
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* @return string A single line read from the file. |
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* |
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* @todo Should this add a newline if maxlength is reached? |
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* @todo I could actually buffer this by reading x chars at a time and doing |
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* the same thing with looping char by char if this is too IO intensive. |
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*/ |
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public function readLine($eol = PHP_EOL, $maxLength = null) |
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{ |
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$size = 0; |
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$buffer = false; |
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if (!is_array($eol)) { |
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$eol = [$eol]; |
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} |
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while (!$this->eof()) { |
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// Using a loose equality here to match on '' and false. |
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if (null == ($byte = $this->read(1))) { |
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return $buffer; |
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} |
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$buffer .= $byte; |
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// Break when a new line is found or the max length - 1 is reached |
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if (array_reduce($eol, function ($carry, $eol) use ($buffer) { |
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if (!$carry) { |
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$eollen = 0 - strlen($eol); |
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return substr($buffer, $eollen) === $eol; |
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} |
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return true; |
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}, false) || ++$size === $maxLength - 1) { |
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break; |
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} |
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} |
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return $buffer; |
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} |
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abstract public function isReadable(); |
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abstract public function read($length); |
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abstract public function eof(); |
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/** |
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* Assert that this file/stream object is readable. |
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* |
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* @throws IOException |
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*/ |
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protected function assertIsReadable() |
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{ |
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if (!$this->isReadable()) { |
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throw new IOException('Stream not readable', IOException::ERR_NOT_READABLE); |
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} |
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} |
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} |
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nozavroni /
csvelte
