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<?php
namespace Masterminds\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 $is;
// Flipping this to TRUE will give minisculely more debugging info.
public $debug = FALSE;
/**
* Create a new Scanner.
*
* @param \Masterminds\HTML5\Parser\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->key();
}
/**
* Take a peek at the next character in the data.
*
* @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() {
$this->is->next();
if ($this->is->valid()) {
if ($this->debug) fprintf(STDOUT, "> %s\n", $this->is->current());
return $this->is->current();
}
return FALSE;
}
/**
* Get the current character.
*
* Note, this does not advance the pointer.
*
* @return string
* The current character.
*/
public function current() {
if ($this->is->valid()) {
return $this->is->current();
}
return FALSE;
}
/**
* Silently consume N chars.
*/
public function consume($count = 1) {
for ($i = 0; $i < $count; ++$i) {
$this->next();
}
}
/**
* 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) {
$this->is->unconsume($howMany);
}
/**
* Get the next group of that contains hex characters.
*
* Note, along with getting the characters the pointer in the data will be
* moved as well.
*
* @return string
* The next group that is hex characters.
*/
public function getHex() {
return $this->is->charsWhile(static::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(static::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(static::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');
}
/**
* Consume whitespace.
*
* Whitespace in HTML5 is: formfeed, tab, newline, space.
*/
public function whitespace() {
return $this->is->charsWhile("\n\t\f ");
}
/**
* Returns the current line that is being consumed.
*
* @return int
* The current line number.
*/
public function currentLine() {
return $this->is->currentLine();
}
/**
* Read chars until something in the mask is encountered.
*/
public function charsUntil($mask) {
return $this->is->charsUntil($mask);
}
/**
* Read chars as long as the mask matches.
*/
public function charsWhile($mask) {
return $this->is->charsWhile($mask);
}
/**
* Returns the current column of the current line that the tokenizer is at.
*
* Newlines are column 0. The first char after a newline is column 1.
*
* @return int
* The column number.
*/
public function columnOffset() {
return $this->is->columnOffset();
}
/**
* Get all characters until EOF.
*
* This consumes characters until the EOF.
*
* @return int
* The number of characters remaining.
*/
public function remainingChars() {
return $this->is->remainingChars();
}
}
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