WP_HTML_Processor::step_in_head() │ private │ WP 6.7.0
Parses next element in the 'in head' insertion mode.
This internal function performs the 'in head' insertion mode logic for the generalized WP_HTML_Processor::step() function.
Method of the class: WP_HTML_Processor{}
No Hooks.
Return
true|false. Whether an element was found.
Usage
// private - for code of main (parent) class only $result = $this->step_in_head(): bool;
Notes
- See: https://html.spec.whatwg.org/multipage/parsing.html#parsing-main-inhead
- See: WP_HTML_Processor::step
Changelog
| Since 6.7.0 | Introduced. |
WP_HTML_Processor::step_in_head() WP HTML Processor::step in head code WP 6.7.1
private function step_in_head(): bool {
$token_name = $this->get_token_name();
$token_type = $this->get_token_type();
$is_closer = parent::is_tag_closer();
$op_sigil = '#tag' === $token_type ? ( $is_closer ? '-' : '+' ) : '';
$op = "{$op_sigil}{$token_name}";
switch ( $op ) {
case '#text':
/*
* > A character token that is one of U+0009 CHARACTER TABULATION,
* > U+000A LINE FEED (LF), U+000C FORM FEED (FF),
* > U+000D CARRIAGE RETURN (CR), or U+0020 SPACE
*/
if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) {
// Insert the character.
$this->insert_html_element( $this->state->current_token );
return true;
}
goto in_head_anything_else;
break;
/*
* > A comment token
*/
case '#comment':
case '#funky-comment':
case '#presumptuous-tag':
$this->insert_html_element( $this->state->current_token );
return true;
/*
* > A DOCTYPE token
*/
case 'html':
// Parse error: ignore the token.
return $this->step();
/*
* > A start tag whose tag name is "html"
*/
case '+HTML':
return $this->step_in_body();
/*
* > A start tag whose tag name is one of: "base", "basefont", "bgsound", "link"
*/
case '+BASE':
case '+BASEFONT':
case '+BGSOUND':
case '+LINK':
$this->insert_html_element( $this->state->current_token );
return true;
/*
* > A start tag whose tag name is "meta"
*/
case '+META':
$this->insert_html_element( $this->state->current_token );
/*
* > If the active speculative HTML parser is null, then:
* > - If the element has a charset attribute, and getting an encoding from
* > its value results in an encoding, and the confidence is currently
* > tentative, then change the encoding to the resulting encoding.
*/
$charset = $this->get_attribute( 'charset' );
if ( is_string( $charset ) && 'tentative' === $this->state->encoding_confidence ) {
$this->bail( 'Cannot yet process META tags with charset to determine encoding.' );
}
/*
* > - Otherwise, if the element has an http-equiv attribute whose value is
* > an ASCII case-insensitive match for the string "Content-Type", and
* > the element has a content attribute, and applying the algorithm for
* > extracting a character encoding from a meta element to that attribute's
* > value returns an encoding, and the confidence is currently tentative,
* > then change the encoding to the extracted encoding.
*/
$http_equiv = $this->get_attribute( 'http-equiv' );
$content = $this->get_attribute( 'content' );
if (
is_string( $http_equiv ) &&
is_string( $content ) &&
0 === strcasecmp( $http_equiv, 'Content-Type' ) &&
'tentative' === $this->state->encoding_confidence
) {
$this->bail( 'Cannot yet process META tags with http-equiv Content-Type to determine encoding.' );
}
return true;
/*
* > A start tag whose tag name is "title"
*/
case '+TITLE':
$this->insert_html_element( $this->state->current_token );
return true;
/*
* > A start tag whose tag name is "noscript", if the scripting flag is enabled
* > A start tag whose tag name is one of: "noframes", "style"
*
* The scripting flag is never enabled in this parser.
*/
case '+NOFRAMES':
case '+STYLE':
$this->insert_html_element( $this->state->current_token );
return true;
/*
* > A start tag whose tag name is "noscript", if the scripting flag is disabled
*/
case '+NOSCRIPT':
$this->insert_html_element( $this->state->current_token );
$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_HEAD_NOSCRIPT;
return true;
/*
* > A start tag whose tag name is "script"
*
* @todo Could the adjusted insertion location be anything other than the current location?
*/
case '+SCRIPT':
$this->insert_html_element( $this->state->current_token );
return true;
/*
* > An end tag whose tag name is "head"
*/
case '-HEAD':
$this->state->stack_of_open_elements->pop();
$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_AFTER_HEAD;
return true;
/*
* > An end tag whose tag name is one of: "body", "html", "br"
*
* BR tags are always reported by the Tag Processor as opening tags.
*/
case '-BODY':
case '-HTML':
/*
* > Act as described in the "anything else" entry below.
*/
goto in_head_anything_else;
break;
/*
* > A start tag whose tag name is "template"
*
* @todo Could the adjusted insertion location be anything other than the current location?
*/
case '+TEMPLATE':
$this->state->active_formatting_elements->insert_marker();
$this->state->frameset_ok = false;
$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TEMPLATE;
$this->state->stack_of_template_insertion_modes[] = WP_HTML_Processor_State::INSERTION_MODE_IN_TEMPLATE;
$this->insert_html_element( $this->state->current_token );
return true;
/*
* > An end tag whose tag name is "template"
*/
case '-TEMPLATE':
if ( ! $this->state->stack_of_open_elements->contains( 'TEMPLATE' ) ) {
// @todo Indicate a parse error once it's possible.
return $this->step();
}
$this->generate_implied_end_tags_thoroughly();
if ( ! $this->state->stack_of_open_elements->current_node_is( 'TEMPLATE' ) ) {
// @todo Indicate a parse error once it's possible.
}
$this->state->stack_of_open_elements->pop_until( 'TEMPLATE' );
$this->state->active_formatting_elements->clear_up_to_last_marker();
array_pop( $this->state->stack_of_template_insertion_modes );
$this->reset_insertion_mode_appropriately();
return true;
}
/*
* > A start tag whose tag name is "head"
* > Any other end tag
*/
if ( '+HEAD' === $op || $is_closer ) {
// Parse error: ignore the token.
return $this->step();
}
/*
* > Anything else
*/
in_head_anything_else:
$this->state->stack_of_open_elements->pop();
$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_AFTER_HEAD;
return $this->step( self::REPROCESS_CURRENT_NODE );
}