Created
April 26, 2012 09:12
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Tokenizer Example of Mirc Color and Style (bold) Codes.
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<?php | |
/** | |
* Tokenizer Example of Mirc Color and Style (bold) Codes. | |
* | |
* @link http://stackoverflow.com/q/10329443/367456 | |
*/ | |
$mirc = "\x034this text is red\x033this text is green\x03 \x02bold text\x02 | |
\x034,3this text is red with a green background\x03"; | |
$tokenizer = new Tokenizer($mirc); | |
while(list($token, $data) = $tokenizer->getNext()) | |
{ | |
switch($token) | |
{ | |
case 'color-fgbg': | |
printf('<%s:%d,%d>', $token, $data[1], $data[2]); | |
break; | |
case 'color-fg': | |
printf('<%s:%d>', $token, $data[1]); | |
break; | |
case 'color-reset': | |
case 'style-bold'; | |
printf('<%s>', $token); | |
break; | |
case 'catch-all': | |
echo $data[0]; | |
break; | |
default: | |
throw new Exception(sprintf('Unknown token <%s>.', $token)); | |
} | |
} | |
/** | |
* regular expression based tokenizer, | |
* first token wins. | |
*/ | |
class Tokenizer | |
{ | |
private $subject; | |
private $offset = 0; | |
private $tokens = array( | |
'color-fgbg' => '\x03(\d{1,2}),(\d{1,2})', | |
'color-fg' => '\x03(\d{1,2})', | |
'color-reset' => '\x03', | |
'style-bold' => '\x02', | |
'catch-all' => '.|\n', | |
); | |
public function __construct($subject) | |
{ | |
$this->subject = (string) $subject; | |
} | |
public function setOffset($offset) | |
{ | |
$this->offset = max(0, $offset); | |
} | |
public function getOffset() | |
{ | |
return $this->offset; | |
} | |
/** | |
* @return array|null | |
*/ | |
public function getNext() | |
{ | |
if ($this->offset >= strlen($this->subject)) | |
return NULL; | |
foreach($this->tokens as $name => $token) | |
{ | |
if (FALSE === $r = preg_match("~$token~", $this->subject, $matches, PREG_OFFSET_CAPTURE, $this->offset)) | |
throw new RuntimeException('Pattern for token %s failed (regex error).', $name); | |
if ($r === 0) | |
continue; | |
if (!isset($matches[0])) { | |
var_dump(substr($this->subject, $this->offset)); | |
$c = 1; | |
} | |
if ($matches[0][1] !== $this->offset) | |
continue; | |
$data = array(); | |
foreach($matches as $match) | |
{ | |
list($data[]) = $match; | |
} | |
$this->offset += strlen($data[0]); | |
return array($name, $data); | |
} | |
return NULL; | |
} | |
} |
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