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StringDataSource.php
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StringDataSource.php
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<?php
/**
* @file
* @license https://opensource.org/licenses/Apache-2.0 Apache-2.0
*/
namespace Wikimedia\CSS\Parser;
use InvalidArgumentException;
use UnexpectedValueException;
/**
* Read data for the CSS parser
*/
class StringDataSource implements DataSource {
/** @var string */
protected $string;
/** @var int */
protected $len = 0;
/** @var int */
protected $pos = 0;
/** @var string[] */
protected $putBack = [];
/**
* @param string $string Input string. Must be valid UTF-8 with no BOM.
*/
public function __construct( $string ) {
$this->string = (string)$string;
$this->len = strlen( $this->string );
if ( !mb_check_encoding( $this->string, 'UTF-8' ) ) {
throw new InvalidArgumentException( '$string is not valid UTF-8' );
}
}
/** @inheritDoc */
public function readCharacter() {
if ( $this->putBack ) {
return array_pop( $this->putBack );
}
if ( $this->pos >= $this->len ) {
return self::EOF;
}
// We already checked that the string is valid UTF-8 in the
// constructor, so we can do a quick binary "get next character" here.
$p = $this->pos;
$c = $this->string[$p];
$cc = ord( $this->string[$p] );
if ( $cc <= 0x7f ) {
$this->pos++;
return $c;
} elseif ( ( $cc & 0xe0 ) === 0xc0 ) {
$this->pos += 2;
return substr( $this->string, $p, 2 );
} elseif ( ( $cc & 0xf0 ) === 0xe0 ) {
$this->pos += 3;
return substr( $this->string, $p, 3 );
} elseif ( ( $cc & 0xf8 ) === 0xf0 ) {
$this->pos += 4;
return substr( $this->string, $p, 4 );
} else {
// WTF? Should never get here because it should have failed
// validation in the constructor.
// @codeCoverageIgnoreStart
throw new UnexpectedValueException(
sprintf( 'Unexpected byte %02X in string at position %d.', $cc, $this->pos )
);
// @codeCoverageIgnoreEnd
}
}
/** @inheritDoc */
public function putBackCharacter( $char ) {
if ( $char !== self::EOF ) {
$this->putBack[] = $char;
}
}
}

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text/x-php
Expires
Aug 19 2026, 18:51 (6 w, 2 d ago)
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local-disk
Storage Format
Raw Data
Storage Handle
45/cd/8f27d55545c5b3d4fc1d3a54f7b2
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StringDataSource.php (1 KB)

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