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<?php
/**
* @file
*
* The CSS Input Stream abstraction.
*/
namespace QueryPath\CSS;
/**
* Simple wrapper to turn a string into an input stream.
* This provides a standard interface on top of an array of
* characters.
*/
class InputStream {
protected $stream = NULL;
public $position = 0;
/**
* Build a new CSS input stream from a string.
*
* @param string
* String to turn into an input stream.
*/
function __construct($string) {
$this->stream = str_split($string);
}
/**
* Look ahead one character.
*
* @return char
* Returns the next character, but does not remove it from
* the stream.
*/
function peek() {
return $this->stream[0];
}
/**
* Get the next unconsumed character in the stream.
* This will remove that character from the front of the
* stream and return it.
*/
function consume() {
$ret = array_shift($this->stream);
if (!empty($ret)) {
$this->position++;
}
return $ret;
}
/**
* Check if the stream is empty.
* @return boolean
* Returns TRUE when the stream is empty, FALSE otherwise.
*/
function isEmpty() {
return count($this->stream) == 0;
}
}
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