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<?php
/**
* SerializeParser
*
* @copyright Jason Judge
*
* @license http://opensource.org/licenses/MIT MIT
*
* @link https://github.com/academe/SerializeParser/blob/master/src/StringReader.php
*/
namespace Nextend\SmartSlider3\BackupSlider\Serialize;
/**
* Given a string, this class will read through the string using
* one of a number of terminating rules:
* - One character.
* - A specified number of characters.
* - Until a matching character is found.
*/
class StringReader
{
protected $pos = 0;
protected $max = 0;
protected $string = [];
public function __construct($string)
{
// Split the string up into an array of UTF-8 characters.
// As an array we can read through it one character at a time.
//$this->string = preg_split('//u', $string, -1, PREG_SPLIT_NO_EMPTY);
//$this->max = count($this->string) - 1;
$this->string = $string;
$this->max = strlen($this->string) - 1;
}
/**
* Read the next character from the supplied string.
* Return null when we have run out of characters.
*/
public function readOne()
{
if ($this->pos <= $this->max) {
$value = $this->string[$this->pos];
$this->pos += 1;
} else {
$value = null;
}
return $value;
}
/**
* Read characters until we reach the given character $char.
* By default, discard that final matching character and return
* the rest.
*/
public function readUntil($char, $discard_char = true)
{
$value = '';
while(null !== ($one = $this->readOne())) {
if ($one !== $char || !$discard_char) {
$value .= $one;
}
if ($one === $char) {
break;
}
}
return $value;
}
/**
* Read $count characters, or until we have reached the end,
* whichever comes first.
* By default, remove enclosing double-quotes from the result.
*/
public function read($count, $strip_quotes = true)
{
$value = '';
while($count > 0 && null != ($one = $this->readOne())) {
$value .= $one;
$count -= 1;
}
return $strip_quotes ? $this->stripQuotes($value) : $value;
}
/**
* Remove a single set of double-quotes from around a string.
* abc => abc
* "abc" => abc
* ""abc"" => "abc"
*
* @param string string
* @returns string
*/
public function stripQuotes($string)
{
// Only remove exactly one quote from the start and the end,
// and then only if there is one at each end.
if (strlen($string) < 2 || substr($string, 0, 1) !== '"' || substr($string, -1, 1) !== '"') {
// Too short, or does not start or end with a quote.
return $string;
}
// Return the middle of the string, from the second character to the second-but-last.
return substr($string, 1, -1);
}
}