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<?php
namespace HTML5\Parser;
/**
* The scanner.
*
* This scans over an input stream.
*/
class Scanner {
const CHARS_HEX = 'abcdefABCDEF01234567890';
const CHARS_ALNUM = 'abcdefAghijklmnopqrstuvwxyABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890';
const CHARS_ALPHA = 'abcdefAghijklmnopqrstuvwxyABCDEFGHIJKLMNOPQRSTUVWXYZ';
protected $char;
protected $is;
/**
* Create a new Scanner.
*
* @param \HTML5\InputStream $input
* An InputStream to be scanned.
*/
public function __construct($input) {
$this->is = $input;
}
/**
* Get the current position.
*
* @return int
* The current intiger byte position.
*/
public function position() {
return $this->is->position();
}
/**
* Take a peek at the character after the next character in the data.
*
* For example, you start scanning the string abc. The pointer is before a.
* When you start peek() will return b while next() will return a.
*
* @return string
* The next character.
*/
public function peek() {
return $this->is->peek();
}
/**
* Get the next character.
*
* Note: This advances the pointer.
*
* @return string
* The next character.
*/
public function next() {
$this->char = $this->is->char();
return $this->char;
}
/**
* Get the current character.
*
* Note, this does not advance the pointer.
*
* @return string
* The current character.
*/
public function current() {
return $this->char;
}
/**
* Unconsume some of the data. This moves the data pointer backwards.
*
* @param int $howMany
* The number of characters to move the pointer back.
*/
public function unconsume($howMany = 1) {
for ($i = 0; $i < $howMany; ++$i) {
$this->is->unconsume();
}
}
/**
* Get the next group of that is a hex value.
*
* Note, along with getting the characters the pointer in the data will be
* moved as well.
*
* @todo There is a potential for many false positives with this method. Make it more accurate.
*
* @return string
* The next group that is a hex value.
*/
public function getHex() {
return $this->is->charsWhile(self::CHARS_HEX);
}
/**
* Get the next group of characters that are ASCII Alpha characters.
*
* Note, along with getting the characters the pointer in the data will be
* moved as well.
*
* @return string
* The next group of ASCII alpha characters.
*/
public function getAsciiAlpha() {
return $this->is->charsWhile(self::CHARS_ALPHA);
}
/**
* Get the next group of characters that are ASCII Alpha characters and numbers.
*
* Note, along with getting the characters the pointer in the data will be
* moved as well.
*
* @return string
* The next group of ASCII alpha characters and numbers.
*/
public function getAsciiAlphaNum() {
return $this->is->charsWhile(self::CHARS_ALNUM);
}
/**
* Get the next group of numbers.
*
* Note, along with getting the characters the pointer in the data will be
* moved as well.
*
* @return string
* The next group of numbers.
*/
public function getNumeric() {
return $this->is->charsWhile('0123456789');
}
}
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