ystem identifier ────╯
* ╰──┴── name is "html".
*
* If a public identifier were provided it would indicate to a knowledgeable
* parser how to interpret the system identifier.
*
*
* │ │ ╰─── public identifier ─────╯ ╰──── system identifier ────╯
* ╰──┴── name is "html".
*
* @see https://html.spec.whatwg.org/#tokenization
*
* @since 6.7.0
*
* @var string|null
*/
public $system_identifier = null;
/**
* Which document compatability mode this DOCTYPE declaration indicates.
*
* This value should be considered "read only" and not modified.
*
* When an HTML parser has not already set the document compatability mode,
* (e.g. "quirks" or "no-quirks" mode), it will infer if from the properties
* of the appropriate DOCTYPE declaration, if one exists. The DOCTYPE can
* indicate one of three possible document compatability modes:
*
* - "no-quirks" and "limited-quirks" modes (also called "standards" mode).
* - "quirks" mode (also called `CSS1Compat` mode).
*
* An appropriate DOCTYPE is one encountered in the "initial" insertion mode,
* before the HTML element has been opened and before finding any other
* DOCTYPE declaration tokens.
*
* @see https://html.spec.whatwg.org/#the-initial-insertion-mode
*
* @since 6.7.0
*
* @var string One of "no-quirks", "limited-quirks", or "quirks".
*/
public $indicated_compatability_mode;
/**
* Constructor.
*
* This class should not be instantiated directly.
* Use the static {@see self::from_doctype_token} method instead.
*
* The arguments to this constructor correspond to the "DOCTYPE token"
* as defined in the HTML specification.
*
* > DOCTYPE tokens have a name, a public identifier, a system identifier,
* > and a force-quirks flag. When a DOCTYPE token is created, its name, public identifier,
* > and system identifier must be marked as missing (which is a distinct state from the
* > empty string), and the force-quirks flag must be set to off (its other state is on).
*
* @see https://html.spec.whatwg.org/multipage/parsing.html#tokenization
*
* @since 6.7.0
*
* @param string|null $name Name of the DOCTYPE.
* @param string|null $public_identifier Public identifier of the DOCTYPE.
* @param string|null $system_identifier System identifier of the DOCTYPE.
* @param bool $force_quirks_flag Whether the force-quirks flag is set for the token.
*/
private function __construct(
?string $name,
?string $public_identifier,
?string $system_identifier,
bool $force_quirks_flag
) {
$this->name = $name;
$this->public_identifier = $public_identifier;
$this->system_identifier = $system_identifier;
/*
* > If the DOCTYPE token matches one of the conditions in the following list,
* > then set the Document to quirks mode:
*/
/*
* > The force-quirks flag is set to on.
*/
if ( $force_quirks_flag ) {
$this->indicated_compatability_mode = 'quirks';
return;
}
/*
* Normative documents will contain the literal `` with no
* public or system identifiers; short-circuit to avoid extra parsing.
*/
if ( 'html' === $name && null === $public_identifier && null === $system_identifier ) {
$this->indicated_compatability_mode = 'no-quirks';
return;
}
/*
* > The name is not "html".
*
* The tokenizer must report the name in lower case even if provided in
* the document in upper case; thus no conversion is required here.
*/
if ( 'html' !== $name ) {
$this->indicated_compatability_mode = 'quirks';
return;
}
/*
* Set up some variables to handle the rest of the conditions.
*
* > set...the public identifier...to...the empty string if the public identifier was missing.
* > set...the system identifier...to...the empty string if the system identifier was missing.
* >
* > The system identifier and public identifier strings must be compared...
* > in an ASCII case-insensitive manner.
* >
* > A system identifier whose value is the empty string is not considered missing
* > for the purposes of the conditions above.
*/
$system_identifier_is_missing = null === $system_identifier;
$public_identifier = null === $public_identifier ? '' : strtolower( $public_identifier );
$system_identifier = null === $system_identifier ? '' : strtolower( $system_identifier );
/*
* > The public identifier is set to…
*/
if (
'-//w3o//dtd w3 html strict 3.0//en//' === $public_identifier ||
'-/w3c/dtd html 4.0 transitional/en' === $public_identifier ||
'html' === $public_identifier
) {
$this->indicated_compatability_mode = 'quirks';
return;
}
/*
* > The system identifier is set to…
*/
if ( 'http://www.ibm.com/data/dtd/v11/ibmxhtml1-transitional.dtd' === $system_identifier ) {
$this->indicated_compatability_mode = 'quirks';
return;
}
/*
* All of the following conditions depend on matching the public identifier.
* If the public identifier is empty, none of the following conditions will match.
*/
if ( '' === $public_identifier ) {
$this->indicated_compatability_mode = 'no-quirks';
return;
}
/*
* > The public identifier starts with…
*
* @todo Optimize this matching. It shouldn't be a large overall performance issue,
* however, as only a single DOCTYPE declaration token should ever be parsed,
* and normative documents will have exited before reaching this condition.
*/
if (
str_starts_with( $public_identifier, '+//silmaril//dtd html pro v0r11 19970101//' ) ||
str_starts_with( $public_identifier, '-//as//dtd html 3.0 aswedit + extensions//' ) ||
str_starts_with( $public_identifier, '-//advasoft ltd//dtd html 3.0 aswedit + extensions//' ) ||
str_starts_with( $public_identifier, '-//ietf//dtd html 2.0 level 1//' ) ||
str_starts_with( $public_identifier, '-//ietf//dtd html 2.0 level 2//' ) ||
str_starts_with( $public_identifier, '-//ietf//dtd html 2.0 strict level 1//' ) ||
str_starts_with( $public_identifier, '-//ietf//dtd html 2.0 strict level 2//' ) ||
str_starts_with( $public_identifier, '-//ietf//dtd html 2.0 strict//' ) ||
str_starts_with( $public_identifier, '-//ietf//dtd html 2.0//' ) ||
str_starts_with( $public_identifier, '-//ietf//dtd html 2.1e//' ) ||
str_starts_with( $public_identifier, '-//ietf//dtd html 3.0//' ) ||
str_starts_with( $public_identifier, '-//ietf//dtd html 3.2 final//' ) ||
str_starts_with( $public_identifier, '-//ietf//dtd html 3.2//' ) ||
str_starts_with( $public_identifier, '-//ietf//dtd html 3//' ) ||
str_starts_with( $public_identifier, '-//ietf//dtd html level 0//' ) ||
str_starts_with( $public_identifier, '-//ietf//dtd html level 1//' ) ||
str_starts_with( $public_identifier, '-//ietf//dtd html level 2//' ) ||
str_starts_with( $public_identifier, '-//ietf//dtd html level 3//' ) ||
str_starts_with( $public_identifier, '-//ietf//dtd html strict level 0//' ) ||
str_starts_with( $public_identifier, '-//ietf//dtd html strict level 1//' ) ||
str_starts_with( $public_identifier, '-//ietf//dtd html strict level 2//' ) ||
str_starts_with( $public_identifier, '-//ietf//dtd html strict level 3//' ) ||
str_starts_with( $public_identifier, '-//ietf//dtd html strict//' ) ||
str_starts_with( $public_identifier, '-//ietf//dtd html//' ) ||
str_starts_with( $public_identifier, '-//metrius//dtd metrius presentational//' ) ||
str_starts_with( $public_identifier, '-//microsoft//dtd internet explorer 2.0 html strict//' ) ||
str_starts_with( $public_identifier, '-//microsoft//dtd internet explorer 2.0 html//' ) ||
str_starts_with( $public_identifier, '-//microsoft//dtd internet explorer 2.0 tables//' ) ||
str_starts_with( $public_identifier, '-//microsoft//dtd internet explorer 3.0 html strict//' ) ||
str_starts_with( $public_identifier, '-//microsoft//dtd internet explorer 3.0 html//' ) ||
str_starts_with( $public_identifier, '-//microsoft//dtd internet explorer 3.0 tables//' ) ||
str_starts_with( $public_identifier, '-//netscape comm. corp.//dtd html//' ) ||
str_starts_with( $public_identifier, '-//netscape comm. corp.//dtd strict html//' ) ||
str_starts_with( $public_identifier, "-//o'reilly and associates//dtd html 2.0//" ) ||
str_starts_with( $public_identifier, "-//o'reilly and associates//dtd html extended 1.0//" ) ||
str_starts_with( $public_identifier, "-//o'reilly and associates//dtd html extended relaxed 1.0//" ) ||
str_starts_with( $public_identifier, '-//sq//dtd html 2.0 hotmetal + extensions//' ) ||
str_starts_with( $public_identifier, '-//softquad software//dtd hotmetal pro 6.0::19990601::extensions to html 4.0//' ) ||
str_starts_with( $public_identifier, '-//softquad//dtd hotmetal pro 4.0::19971010::extensions to html 4.0//' ) ||
str_starts_with( $public_identifier, '-//spyglass//dtd html 2.0 extended//' ) ||
str_starts_with( $public_identifier, '-//sun microsystems corp.//dtd hotjava html//' ) ||
str_starts_with( $public_identifier, '-//sun microsystems corp.//dtd hotjava strict html//' ) ||
str_starts_with( $public_identifier, '-//w3c//dtd html 3 1995-03-24//' ) ||
str_starts_with( $public_identifier, '-//w3c//dtd html 3.2 draft//' ) ||
str_starts_with( $public_identifier, '-//w3c//dtd html 3.2 final//' ) ||
str_starts_with( $public_identifier, '-//w3c//dtd html 3.2//' ) ||
str_starts_with( $public_identifier, '-//w3c//dtd html 3.2s draft//' ) ||
str_starts_with( $public_identifier, '-//w3c//dtd html 4.0 frameset//' ) ||
str_starts_with( $public_identifier, '-//w3c//dtd html 4.0 transitional//' ) ||
str_starts_with( $public_identifier, '-//w3c//dtd html experimental 19960712//' ) ||
str_starts_with( $public_identifier, '-//w3c//dtd html experimental 970421//' ) ||
str_starts_with( $public_identifier, '-//w3c//dtd w3 html//' ) ||
str_starts_with( $public_identifier, '-//w3o//dtd w3 html 3.0//' ) ||
str_starts_with( $public_identifier, '-//webtechs//dtd mozilla html 2.0//' ) ||
str_starts_with( $public_identifier, '-//webtechs//dtd mozilla html//' )
) {
$this->indicated_compatability_mode = 'quirks';
return;
}
/*
* > The system identifier is missing and the public identifier starts with…
*/
if (
$system_identifier_is_missing && (
str_starts_with( $public_identifier, '-//w3c//dtd html 4.01 frameset//' ) ||
str_starts_with( $public_identifier, '-//w3c//dtd html 4.01 transitional//' )
)
) {
$this->indicated_compatability_mode = 'quirks';
return;
}
/*
* > Otherwise, if the DOCTYPE token matches one of the conditions in
* > the following list, then set the Document to limited-quirks mode.
*/
/*
* > The public identifier starts with…
*/
if (
str_starts_with( $public_identifier, '-//w3c//dtd xhtml 1.0 frameset//' ) ||
str_starts_with( $public_identifier, '-//w3c//dtd xhtml 1.0 transitional//' )
) {
$this->indicated_compatability_mode = 'limited-quirks';
return;
}
/*
* > The system identifier is not missing and the public identifier starts with…
*/
if (
! $system_identifier_is_missing && (
str_starts_with( $public_identifier, '-//w3c//dtd html 4.01 frameset//' ) ||
str_starts_with( $public_identifier, '-//w3c//dtd html 4.01 transitional//' )
)
) {
$this->indicated_compatability_mode = 'limited-quirks';
return;
}
$this->indicated_compatability_mode = 'no-quirks';
}
/**
* Creates a WP_HTML_Doctype_Info instance by parsing a raw DOCTYPE declaration token.
*
* Use this method to parse a DOCTYPE declaration token and get access to its properties
* via the returned WP_HTML_Doctype_Info class instance. The provided input must parse
* properly as a DOCTYPE declaration, though it must not represent a valid DOCTYPE.
*
* Example:
*
* // Normative HTML DOCTYPE declaration.
* $doctype = WP_HTML_Doctype_Info::from_doctype_token( '' );
* 'no-quirks' === $doctype->indicated_compatability_mode;
*
* // A nonsensical DOCTYPE is still valid, and will indicate "quirks" mode.
* $doctype = WP_HTML_Doctype_Info::from_doctype_token( '' );
* 'quirks' === $doctype->indicated_compatability_mode;
*
* // Textual quirks present in raw HTML are handled appropriately.
* $doctype = WP_HTML_Doctype_Info::from_doctype_token( "" );
* 'no-quirks' === $doctype->indicated_compatability_mode;
*
* // Anything other than a proper DOCTYPE declaration token fails to parse.
* null === WP_HTML_Doctype_Info::from_doctype_token( ' ' );
* null === WP_HTML_Doctype_Info::from_doctype_token( '
' );
* null === WP_HTML_Doctype_Info::from_doctype_token( '' );
* null === WP_HTML_Doctype_Info::from_doctype_token( 'html' );
* null === WP_HTML_Doctype_Info::from_doctype_token( '' );
*
* @since 6.7.0
*
* @param string $doctype_html The complete raw DOCTYPE HTML string, e.g. ``.
*
* @return WP_HTML_Doctype_Info|null A WP_HTML_Doctype_Info instance will be returned if the
* provided DOCTYPE HTML is a valid DOCTYPE. Otherwise, null.
*/
public static function from_doctype_token( string $doctype_html ): ?self {
$doctype_name = null;
$doctype_public_id = null;
$doctype_system_id = null;
$end = strlen( $doctype_html ) - 1;
/*
* This parser combines the rules for parsing DOCTYPE tokens found in the HTML
* specification for the DOCTYPE related tokenizer states.
*
* @see https://html.spec.whatwg.org/#doctype-state
*/
/*
* - Valid DOCTYPE HTML token must be at least `` assuming a complete token not
* ending in end-of-file.
* - It must start with an ASCII case-insensitive match for `` must be the final byte in the HTML string.
*/
if (
$end < 9 ||
0 !== substr_compare( $doctype_html, '`?
if ( '>' !== $doctype_html[ $end ] || ( strcspn( $doctype_html, '>', $at ) + $at ) < $end ) {
return null;
}
/*
* Perform newline normalization and ensure the $end value is correct after normalization.
*
* @see https://html.spec.whatwg.org/#preprocessing-the-input-stream
* @see https://infra.spec.whatwg.org/#normalize-newlines
*/
$doctype_html = str_replace( "\r\n", "\n", $doctype_html );
$doctype_html = str_replace( "\r", "\n", $doctype_html );
$end = strlen( $doctype_html ) - 1;
/*
* In this state, the doctype token has been found and its "content" optionally including the
* name, public identifier, and system identifier is between the current position and the end.
*
* ""
* ╰─ $at ╰─ $end
*
* It's also possible that the declaration part is empty.
*
* ╭─ $at
* ""
* ╰─ $end
*
* Rules for parsing ">" which terminates the DOCTYPE do not need to be considered as they
* have been handled above in the condition that the provided DOCTYPE HTML must contain
* exactly one ">" character in the final position.
*/
/*
*
* Parsing effectively begins in "Before DOCTYPE name state". Ignore whitespace and
* proceed to the next state.
*
* @see https://html.spec.whatwg.org/#before-doctype-name-state
*/
$at += strspn( $doctype_html, " \t\n\f\r", $at );
if ( $at >= $end ) {
return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true );
}
$name_length = strcspn( $doctype_html, " \t\n\f\r", $at, $end - $at );
$doctype_name = str_replace( "\0", "\u{FFFD}", strtolower( substr( $doctype_html, $at, $name_length ) ) );
$at += $name_length;
$at += strspn( $doctype_html, " \t\n\f\r", $at, $end - $at );
if ( $at >= $end ) {
return new self( $doctype_name, $doctype_public_id, $doctype_system_id, false );
}
/*
* "After DOCTYPE name state"
*
* Find a case-insensitive match for "PUBLIC" or "SYSTEM" at this point.
* Otherwise, set force-quirks and enter bogus DOCTYPE state (skip the rest of the doctype).
*
* @see https://html.spec.whatwg.org/#after-doctype-name-state
*/
if ( $at + 6 >= $end ) {
return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true );
}
/*
* > If the six characters starting from the current input character are an ASCII
* > case-insensitive match for the word "PUBLIC", then consume those characters
* > and switch to the after DOCTYPE public keyword state.
*/
if ( 0 === substr_compare( $doctype_html, 'PUBLIC', $at, 6, true ) ) {
$at += 6;
$at += strspn( $doctype_html, " \t\n\f\r", $at, $end - $at );
if ( $at >= $end ) {
return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true );
}
goto parse_doctype_public_identifier;
}
/*
* > Otherwise, if the six characters starting from the current input character are an ASCII
* > case-insensitive match for the word "SYSTEM", then consume those characters and switch
* > to the after DOCTYPE system keyword state.
*/
if ( 0 === substr_compare( $doctype_html, 'SYSTEM', $at, 6, true ) ) {
$at += 6;
$at += strspn( $doctype_html, " \t\n\f\r", $at, $end - $at );
if ( $at >= $end ) {
return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true );
}
goto parse_doctype_system_identifier;
}
/*
* > Otherwise, this is an invalid-character-sequence-after-doctype-name parse error.
* > Set the current DOCTYPE token's force-quirks flag to on. Reconsume in the bogus
* > DOCTYPE state.
*/
return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true );
parse_doctype_public_identifier:
/*
* The parser should enter "DOCTYPE public identifier (double-quoted) state" or
* "DOCTYPE public identifier (single-quoted) state" by finding one of the valid quotes.
* Anything else forces quirks mode and ignores the rest of the contents.
*
* @see https://html.spec.whatwg.org/#doctype-public-identifier-(double-quoted)-state
* @see https://html.spec.whatwg.org/#doctype-public-identifier-(single-quoted)-state
*/
$closer_quote = $doctype_html[ $at ];
/*
* > This is a missing-quote-before-doctype-public-identifier parse error. Set the
* > current DOCTYPE token's force-quirks flag to on. Reconsume in the bogus DOCTYPE state.
*/
if ( '"' !== $closer_quote && "'" !== $closer_quote ) {
return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true );
}
++$at;
$identifier_length = strcspn( $doctype_html, $closer_quote, $at, $end - $at );
$doctype_public_id = str_replace( "\0", "\u{FFFD}", substr( $doctype_html, $at, $identifier_length ) );
$at += $identifier_length;
if ( $at >= $end || $closer_quote !== $doctype_html[ $at ] ) {
return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true );
}
++$at;
/*
* "Between DOCTYPE public and system identifiers state"
*
* Advance through whitespace between public and system identifiers.
*
* @see https://html.spec.whatwg.org/#between-doctype-public-and-system-identifiers-state
*/
$at += strspn( $doctype_html, " \t\n\f\r", $at, $end - $at );
if ( $at >= $end ) {
return new self( $doctype_name, $doctype_public_id, $doctype_system_id, false );
}
parse_doctype_system_identifier:
/*
* The parser should enter "DOCTYPE system identifier (double-quoted) state" or
* "DOCTYPE system identifier (single-quoted) state" by finding one of the valid quotes.
* Anything else forces quirks mode and ignores the rest of the contents.
*
* @see https://html.spec.whatwg.org/#doctype-system-identifier-(double-quoted)-state
* @see https://html.spec.whatwg.org/#doctype-system-identifier-(single-quoted)-state
*/
$closer_quote = $doctype_html[ $at ];
/*
* > This is a missing-quote-before-doctype-system-identifier parse error. Set the
* > current DOCTYPE token's force-quirks flag to on. Reconsume in the bogus DOCTYPE state.
*/
if ( '"' !== $closer_quote && "'" !== $closer_quote ) {
return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true );
}
++$at;
$identifier_length = strcspn( $doctype_html, $closer_quote, $at, $end - $at );
$doctype_system_id = str_replace( "\0", "\u{FFFD}", substr( $doctype_html, $at, $identifier_length ) );
$at += $identifier_length;
if ( $at >= $end || $closer_quote !== $doctype_html[ $at ] ) {
return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true );
}
return new self( $doctype_name, $doctype_public_id, $doctype_system_id, false );
}
}
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