mirror of
https://github.com/smogon/pokemon-showdown-client.git
synced 2026-03-22 01:55:56 -05:00
92 lines
2.3 KiB
PHP
92 lines
2.3 KiB
PHP
<?php
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/**
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* @file
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* @license https://opensource.org/licenses/Apache-2.0 Apache-2.0
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*/
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namespace Wikimedia\CSS\Parser;
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/**
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* Read data for the CSS parser
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*/
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class StringDataSource implements DataSource {
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/** @var string */
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protected $string;
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/** @var int */
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protected $len = 0, $pos = 0;
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/** @var string[] */
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protected $putBack = [];
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/**
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* @param string $string Input string. Must be valid UTF-8 with no BOM.
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*/
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public function __construct( $string ) {
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static $newPHP;
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$this->string = (string)$string;
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$this->len = strlen( $this->string );
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// HHVM 3.4 and older come with an outdated version of libmbfl that
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// incorrectly allows values above U+10FFFF, so we have to check
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// for them separately. (This issue also exists in PHP 5.3 and
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// older, which are no longer supported.)
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// @codeCoverageIgnoreStart
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if ( $newPHP === null ) {
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$newPHP = !mb_check_encoding( "\xf4\x90\x80\x80", 'UTF-8' );
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}
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// @codeCoverageIgnoreEnd
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if ( !mb_check_encoding( $this->string, 'UTF-8' ) ||
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!$newPHP && preg_match( "/\xf4[\x90-\xbf]|[\xf5-\xff]/S", $this->string ) !== 0
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) {
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throw new \InvalidArgumentException( '$string is not valid UTF-8' );
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}
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}
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public function readCharacter() {
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if ( $this->putBack ) {
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return array_pop( $this->putBack );
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}
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if ( $this->pos >= $this->len ) {
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return self::EOF;
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}
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// We already checked that the string is valid UTF-8 in the
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// constructor, so we can do a quick binary "get next character" here.
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$p = $this->pos;
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$c = $this->string[$p];
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$cc = ord( $this->string[$p] );
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if ( $cc <= 0x7f ) {
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$this->pos += 1;
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return $c;
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} elseif ( ( $cc & 0xe0 ) === 0xc0 ) {
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$this->pos += 2;
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return substr( $this->string, $p, 2 );
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} elseif ( ( $cc & 0xf0 ) === 0xe0 ) {
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$this->pos += 3;
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return substr( $this->string, $p, 3 );
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} elseif ( ( $cc & 0xf8 ) === 0xf0 ) {
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$this->pos += 4;
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return substr( $this->string, $p, 4 );
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} else {
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// WTF? Should never get here because it should have failed
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// validation in the constructor.
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// @codeCoverageIgnoreStart
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throw new \UnexpectedValueException(
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sprintf( 'Unexpected byte %02X in string at position %d.', $cc, $this->pos )
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);
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// @codeCoverageIgnoreEnd
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}
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}
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public function putBackCharacter( $char ) {
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if ( $char !== self::EOF ) {
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$this->putBack[] = $char;
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}
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}
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}
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