ed attribute value to decode. * @return string Decoded UTF-8 value of given attribute value. */ public static function decode_attribute( $text ): string { return static::decode( 'attribute', $text ); } /** * Decodes a span of HTML text, depending on the context in which it's found. * * This is a low-level method; prefer calling WP_HTML_Decoder::decode_attribute() or * WP_HTML_Decoder::decode_text_node() instead. It's provided for cases where this * may be difficult to do from calling code. * * Example: * * '©' = WP_HTML_Decoder::decode( 'data', '©' ); * * @since 6.6.0 * * @access private * * @param string $context `attribute` for decoding attribute values, `data` otherwise. * @param string $text Text document containing span of text to decode. * @return string Decoded UTF-8 string. */ public static function decode( $context, $text ): string { $decoded = ''; $end = strlen( $text ); $at = 0; $was_at = 0; while ( $at < $end ) { $next_character_reference_at = strpos( $text, '&', $at ); if ( false === $next_character_reference_at ) { break; } $character_reference = self::read_character_reference( $context, $text, $next_character_reference_at, $token_length ); if ( isset( $character_reference ) ) { $at = $next_character_reference_at; $decoded .= substr( $text, $was_at, $at - $was_at ); $decoded .= $character_reference; $at += $token_length; $was_at = $at; continue; } ++$at; } if ( 0 === $was_at ) { return $text; } if ( $was_at < $end ) { $decoded .= substr( $text, $was_at, $end - $was_at ); } return $decoded; } /** * Attempt to read a character reference at the given location in a given string, * depending on the context in which it's found. * * If a character reference is found, this function will return the translated value * that the reference maps to. It will then set `$match_byte_length` the * number of bytes of input it read while consuming the character reference. This * gives calling code the opportunity to advance its cursor when traversing a string * and decoding. * * Example: * * null === WP_HTML_Decoder::read_character_reference( 'attribute', 'Ships…', 0 ); * '…' === WP_HTML_Decoder::read_character_reference( 'attribute', 'Ships…', 5, $token_length ); * 8 === $token_length; // `…` * * null === WP_HTML_Decoder::read_character_reference( 'attribute', '¬in', 0 ); * '∉' === WP_HTML_Decoder::read_character_reference( 'attribute', '∉', 0, $token_length ); * 7 === $token_length; // `∉` * * '¬' === WP_HTML_Decoder::read_character_reference( 'data', '¬in', 0, $token_length ); * 4 === $token_length; // `¬` * '∉' === WP_HTML_Decoder::read_character_reference( 'data', '∉', 0, $token_length ); * 7 === $token_length; // `∉` * * @since 6.6.0 * * @global WP_Token_Map $html5_named_character_references Mappings for HTML5 named character references. * * @param string $context `attribute` for decoding attribute values, `data` otherwise. * @param string $text Text document containing span of text to decode. * @param int $at Optional. Byte offset into text where span begins, defaults to the beginning (0). * @param int &$match_byte_length Optional. Set to byte-length of character reference if provided and if a match * is found, otherwise not set. Default null. * @return string|false Decoded character reference in UTF-8 if found, otherwise `false`. */ public static function read_character_reference( $context, $text, $at = 0, &$match_byte_length = null ) { /** * Mappings for HTML5 named character references. * * @var WP_Token_Map $html5_named_character_references */ global $html5_named_character_references; $length = strlen( $text ); if ( $at + 1 >= $length ) { return null; } if ( '&' !== $text[ $at ] ) { return null; } /* * Numeric character references. * * When truncated, these will encode the code point found by parsing the * digits that are available. For example, when `🅰` is truncated * to `DZ` it will encode `DZ`. It does not: * - know how to parse the original `🅰`. * - fail to parse and return plaintext `DZ`. * - fail to parse and return the replacement character `�` */ if ( '#' === $text[ $at + 1 ] ) { if ( $at + 2 >= $length ) { return null; } /** Tracks inner parsing within the numeric character reference. */ $digits_at = $at + 2; if ( 'x' === $text[ $digits_at ] || 'X' === $text[ $digits_at ] ) { $numeric_base = 16; $numeric_digits = '0123456789abcdefABCDEF'; $max_digits = 6; // 􏿿 ++$digits_at; } else { $numeric_base = 10; $numeric_digits = '0123456789'; $max_digits = 7; // 􏿿 } // Cannot encode invalid Unicode code points. Max is to U+10FFFF. $zero_count = strspn( $text, '0', $digits_at ); $digit_count = strspn( $text, $numeric_digits, $digits_at + $zero_count ); $after_digits = $digits_at + $zero_count + $digit_count; $has_semicolon = $after_digits < $length && ';' === $text[ $after_digits ]; $end_of_span = $has_semicolon ? $after_digits + 1 : $after_digits; // `&#` or `&#x` without digits returns into plaintext. if ( 0 === $digit_count && 0 === $zero_count ) { return null; } // Whereas `&#` and only zeros is invalid. if ( 0 === $digit_count ) { $match_byte_length = $end_of_span - $at; return '�'; } // If there are too many digits then it's not worth parsing. It's invalid. if ( $digit_count > $max_digits ) { $match_byte_length = $end_of_span - $at; return '�'; } $digits = substr( $text, $digits_at + $zero_count, $digit_count ); $code_point = intval( $digits, $numeric_base ); /* * Noncharacters, 0x0D, and non-ASCII-whitespace control characters. * * > A noncharacter is a code point that is in the range U+FDD0 to U+FDEF, * > inclusive, or U+FFFE, U+FFFF, U+1FFFE, U+1FFFF, U+2FFFE, U+2FFFF, * > U+3FFFE, U+3FFFF, U+4FFFE, U+4FFFF, U+5FFFE, U+5FFFF, U+6FFFE, * > U+6FFFF, U+7FFFE, U+7FFFF, U+8FFFE, U+8FFFF, U+9FFFE, U+9FFFF, * > U+AFFFE, U+AFFFF, U+BFFFE, U+BFFFF, U+CFFFE, U+CFFFF, U+DFFFE, * > U+DFFFF, U+EFFFE, U+EFFFF, U+FFFFE, U+FFFFF, U+10FFFE, or U+10FFFF. * * A C0 control is a code point that is in the range of U+00 to U+1F, * but ASCII whitespace includes U+09, U+0A, U+0C, and U+0D. * * These characters are invalid but still decode as any valid character. * This comment is here to note and explain why there's no check to * remove these characters or replace them. * * @see https://infra.spec.whatwg.org/#noncharacter */ /* * Code points in the C1 controls area need to be remapped as if they * were stored in Windows-1252. Note! This transformation only happens * for numeric character references. The raw code points in the byte * stream are not translated. * * > If the number is one of the numbers in the first column of * > the following table, then find the row with that number in * > the first column, and set the character reference code to * > the number in the second column of that row. */ if ( $code_point >= 0x80 && $code_point <= 0x9F ) { $windows_1252_mapping = array( 0x20AC, // 0x80 -> EURO SIGN (€). 0x81, // 0x81 -> (no change). 0x201A, // 0x82 -> SINGLE LOW-9 QUOTATION MARK (‚). 0x0192, // 0x83 -> LATIN SMALL LETTER F WITH HOOK (ƒ). 0x201E, // 0x84 -> DOUBLE LOW-9 QUOTATION MARK („). 0x2026, // 0x85 -> HORIZONTAL ELLIPSIS (…). 0x2020, // 0x86 -> DAGGER (†). 0x2021, // 0x87 -> DOUBLE DAGGER (‡). 0x02C6, // 0x88 -> MODIFIER LETTER CIRCUMFLEX ACCENT (ˆ). 0x2030, // 0x89 -> PER MILLE SIGN (‰). 0x0160, // 0x8A -> LATIN CAPITAL LETTER S WITH CARON (Š). 0x2039, // 0x8B -> SINGLE LEFT-POINTING ANGLE QUOTATION MARK (‹). 0x0152, // 0x8C -> LATIN CAPITAL LIGATURE OE (Œ). 0x8D, // 0x8D -> (no change). 0x017D, // 0x8E -> LATIN CAPITAL LETTER Z WITH CARON (Ž). 0x8F, // 0x8F -> (no change). 0x90, // 0x90 -> (no change). 0x2018, // 0x91 -> LEFT SINGLE QUOTATION MARK (‘). 0x2019, // 0x92 -> RIGHT SINGLE QUOTATION MARK (’). 0x201C, // 0x93 -> LEFT DOUBLE QUOTATION MARK (“). 0x201D, // 0x94 -> RIGHT DOUBLE QUOTATION MARK (”). 0x2022, // 0x95 -> BULLET (•). 0x2013, // 0x96 -> EN DASH (–). 0x2014, // 0x97 -> EM DASH (—). 0x02DC, // 0x98 -> SMALL TILDE (˜). 0x2122, // 0x99 -> TRADE MARK SIGN (™). 0x0161, // 0x9A -> LATIN SMALL LETTER S WITH CARON (š). 0x203A, // 0x9B -> SINGLE RIGHT-POINTING ANGLE QUOTATION MARK (›). 0x0153, // 0x9C -> LATIN SMALL LIGATURE OE (œ). 0x9D, // 0x9D -> (no change). 0x017E, // 0x9E -> LATIN SMALL LETTER Z WITH CARON (ž). 0x0178, // 0x9F -> LATIN CAPITAL LETTER Y WITH DIAERESIS (Ÿ). ); $code_point = $windows_1252_mapping[ $code_point - 0x80 ]; } $match_byte_length = $end_of_span - $at; return self::code_point_to_utf8_bytes( $code_point ); } /** Tracks inner parsing within the named character reference. */ $name_at = $at + 1; // Minimum named character reference is two characters. E.g. `GT`. if ( $name_at + 2 > $length ) { return null; } $name_length = 0; $replacement = $html5_named_character_references->read_token( $text, $name_at, $name_length ); if ( false === $replacement ) { return null; } $after_name = $name_at + $name_length; // If the match ended with a semicolon then it should always be decoded. if ( ';' === $text[ $name_at + $name_length - 1 ] ) { $match_byte_length = $after_name - $at; return $replacement; } /* * At this point though there's a match for an entry in the named * character reference table but the match doesn't end in `;`. * It may be allowed if it's followed by something unambiguous. */ $ambiguous_follower = ( $after_name < $length && $name_at < $length && ( ctype_alnum( $text[ $after_name ] ) || '=' === $text[ $after_name ] ) ); // It's non-ambiguous, safe to leave it in. if ( ! $ambiguous_follower ) { $match_byte_length = $after_name - $at; return $replacement; } // It's ambiguous, which isn't allowed inside attributes. if ( 'attribute' === $context ) { return null; } $match_byte_length = $after_name - $at; return $replacement; } /** * Encode a code point number into the UTF-8 encoding. * * This encoder implements the UTF-8 encoding algorithm for converting * a code point into a byte sequence. If it receives an invalid code * point it will return the Unicode Replacement Character U+FFFD `�`. * * Example: * * '🅰' === WP_HTML_Decoder::code_point_to_utf8_bytes( 0x1f170 ); * * // Half of a surrogate pair is an invalid code point. * '�' === WP_HTML_Decoder::code_point_to_utf8_bytes( 0xd83c ); * * @since 6.6.0 * * @see https://www.rfc-editor.org/rfc/rfc3629 For the UTF-8 standard. * * @param int $code_point Which code point to convert. * @return string Converted code point, or `�` if invalid. */ public static function code_point_to_utf8_bytes( $code_point ): string { // Pre-check to ensure a valid code point. if ( $code_point <= 0 || ( $code_point >= 0xD800 && $code_point <= 0xDFFF ) || $code_point > 0x10FFFF ) { return '�'; } if ( $code_point <= 0x7F ) { return chr( $code_point ); } if ( $code_point <= 0x7FF ) { $byte1 = chr( ( $code_point >> 6 ) | 0xC0 ); $byte2 = chr( $code_point & 0x3F | 0x80 ); return "{$byte1}{$byte2}"; } if ( $code_point <= 0xFFFF ) { $byte1 = chr( ( $code_point >> 12 ) | 0xE0 ); $byte2 = chr( ( $code_point >> 6 ) & 0x3F | 0x80 ); $byte3 = chr( $code_point & 0x3F | 0x80 ); return "{$byte1}{$byte2}{$byte3}"; } // Any values above U+10FFFF are eliminated above in the pre-check. $byte1 = chr( ( $code_point >> 18 ) | 0xF0 ); $byte2 = chr( ( $code_point >> 12 ) & 0x3F | 0x80 ); $byte3 = chr( ( $code_point >> 6 ) & 0x3F | 0x80 ); $byte4 = chr( $code_point & 0x3F | 0x80 ); return "{$byte1}{$byte2}{$byte3}{$byte4}"; } } Horizontal filer - LucyJan Skip to main content
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