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Rely on new Block Delimiter class when parsing blocks.
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@dmsnell
dmsnell committed Jun 9, 2024
1 parent 1e0513f commit 6adcb35
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Showing 2 changed files with 77 additions and 103 deletions.
179 changes: 76 additions & 103 deletions src/wp-includes/class-wp-block-parser.php
View file
Original file line number Diff line number Diff line change
Expand Up @@ -88,47 +88,52 @@ public function parse( $document ) {
* @return bool
*/
public function proceed() {
$next_token = $this->next_token();
list( $token_type, $block_name, $attrs, $start_offset, $token_length ) = $next_token;
$delimiter = WP_Parsed_Block_Delimiter_Info::next_delimiter( $this->document, $this->offset, $delimiter_at, $delimiter_length );
$stack_depth = count( $this->stack );

// we may have some HTML soup before the next block.
$leading_html_start = $start_offset > $this->offset ? $this->offset : null;

switch ( $token_type ) {
case 'no-more-tokens':
// if not in a block then flush output.
if ( 0 === $stack_depth ) {
$this->add_freeform();
return false;
}

/*
* Otherwise we have a problem
* This is an error
*
* we have options
* - treat it all as freeform text
* - assume an implicit closer (easiest when not nesting)
*/
if ( ! isset( $delimiter ) ) {
// if not in a block then flush output.
if ( 0 === $stack_depth ) {
$this->add_freeform();
return false;
}

/*
* Otherwise we have a problem
* This is an error
*
* we have options
* - treat it all as freeform text
* - assume an implicit closer (easiest when not nesting)
*/

// for the easy case we'll assume an implicit closer.
if ( 1 === $stack_depth ) {
$this->add_block_from_stack();
return false;
}

/*
* For the nested case where it's more difficult we'll
* have to assume that multiple closers are missing
* and so we'll collapse the whole stack piecewise
*
* The count of the stack changes during each iteration of the loop.
*/
while ( 0 < count( $this->stack ) ) { // phpcs:ignore
$this->add_block_from_stack();
}
return false;
}

// for the easy case we'll assume an implicit closer.
if ( 1 === $stack_depth ) {
$this->add_block_from_stack();
return false;
}
// we may have some HTML soup before the next block.
$leading_html_start = $delimiter_at > $this->offset ? $this->offset : null;

/*
* for the nested case where it's more difficult we'll
* have to assume that multiple closers are missing
* and so we'll collapse the whole stack piecewise
*/
while ( 0 < count( $this->stack ) ) {
$this->add_block_from_stack();
}
return false;
switch ( $delimiter->get_delimiter_type() ) {
case WP_Parsed_Block_Delimiter_Info::VOID:
$block_name = $delimiter->allocate_and_return_block_type();
$attrs = $delimiter->allocate_and_return_parsed_attributes();

case 'void-block':
/*
* easy case is if we stumbled upon a void block
* in the top-level of the document
Expand All @@ -139,41 +144,44 @@ public function proceed() {
substr(
$this->document,
$leading_html_start,
$start_offset - $leading_html_start
$delimiter_at - $leading_html_start
)
);
}

$this->output[] = (array) new WP_Block_Parser_Block( $block_name, $attrs, array(), '', array() );
$this->offset = $start_offset + $token_length;
$this->offset = $delimiter_at + $delimiter_length;
return true;
}

// otherwise we found an inner block.
$this->add_inner_block(
new WP_Block_Parser_Block( $block_name, $attrs, array(), '', array() ),
$start_offset,
$token_length
$delimiter_at,
$delimiter_length
);
$this->offset = $start_offset + $token_length;
$this->offset = $delimiter_at + $delimiter_length;
return true;

case 'block-opener':
case WP_Parsed_Block_Delimiter_Info::OPENER:
$block_name = $delimiter->allocate_and_return_block_type();
$attrs = $delimiter->allocate_and_return_parsed_attributes();

// track all newly-opened blocks on the stack.
array_push(
$this->stack,
new WP_Block_Parser_Frame(
new WP_Block_Parser_Block( $block_name, $attrs, array(), '', array() ),
$start_offset,
$token_length,
$start_offset + $token_length,
$delimiter_at,
$delimiter_length,
$delimiter_at + $delimiter_length,
$leading_html_start
)
);
$this->offset = $start_offset + $token_length;
$this->offset = $delimiter_at + $delimiter_length;
return true;

case 'block-closer':
case WP_Parsed_Block_Delimiter_Info::CLOSER:
/*
* if we're missing an opener we're in trouble
* This is an error
Expand All @@ -191,8 +199,8 @@ public function proceed() {

// if we're not nesting then this is easy - close the block.
if ( 1 === $stack_depth ) {
$this->add_block_from_stack( $start_offset );
$this->offset = $start_offset + $token_length;
$this->add_block_from_stack( $delimiter_at );
$this->offset = $delimiter_at + $delimiter_length;
return true;
}

Expand All @@ -201,18 +209,18 @@ public function proceed() {
* block and add it as a new innerBlock to the parent
*/
$stack_top = array_pop( $this->stack );
$html = substr( $this->document, $stack_top->prev_offset, $start_offset - $stack_top->prev_offset );
$html = substr( $this->document, $stack_top->prev_offset, $delimiter_at - $stack_top->prev_offset );
$stack_top->block->innerHTML .= $html;
$stack_top->block->innerContent[] = $html;
$stack_top->prev_offset = $start_offset + $token_length;
$stack_top->prev_offset = $delimiter_at + $delimiter_length;

$this->add_inner_block(
$stack_top->block,
$stack_top->token_start,
$stack_top->token_length,
$start_offset + $token_length
$delimiter_at + $delimiter_length
);
$this->offset = $start_offset + $token_length;
$this->offset = $delimiter_at + $delimiter_length;
return true;

default:
Expand All @@ -228,69 +236,34 @@ public function proceed() {
*
* Returns the type of the find: kind of find, block information, attributes
*
* @deprecated {WP_VERSION} Replaced by WP_Parsed_Block_Delimiter_Info.
*
* @internal
* @since 5.0.0
* @since 4.6.1 fixed a bug in attribute parsing which caused catastrophic backtracking on invalid block comments
* @since {WP_VERSION} Relies on the WP_Parsed_Block_Delimiter_Info class for parsing.
*
* @return array
*/
public function next_token() {
$matches = null;

/*
* aye the magic
* we're using a single RegExp to tokenize the block comment delimiters
* we're also using a trick here because the only difference between a
* block opener and a block closer is the leading `/` before `wp:` (and
* a closer has no attributes). we can trap them both and process the
* match back in PHP to see which one it was.
*/
$has_match = preg_match( get_block_delimiter_regex(), $this->document, $matches, PREG_OFFSET_CAPTURE, $this->offset );

// if we get here we probably have catastrophic backtracking or out-of-memory in the PCRE.
if ( false === $has_match ) {
$delimiter = WP_Parsed_Block_Delimiter_Info::next_delimiter( $this->document, $this->offset, $delimiter_at, $delimiter_length );
if ( ! isset( $delimiter ) ) {
return array( 'no-more-tokens', null, null, null, null );
}

// we have no more tokens.
if ( 0 === $has_match ) {
return array( 'no-more-tokens', null, null, null, null );
}
$name = $delimiter->allocate_and_return_block_type();
$attrs = $delimiter->allocate_and_return_parsed_attributes() ?? array();

list( $match, $started_at ) = $matches[0];

$length = strlen( $match );
$is_closer = isset( $matches['closer'] ) && -1 !== $matches['closer'][1];
$is_void = isset( $matches['void'] ) && -1 !== $matches['void'][1];
$namespace = $matches['namespace'];
$namespace = ( isset( $namespace ) && -1 !== $namespace[1] ) ? $namespace[0] : 'core/';
$name = $namespace . $matches['name'][0];
$has_attrs = isset( $matches['attrs'] ) && -1 !== $matches['attrs'][1];

/*
* Fun fact! It's not trivial in PHP to create "an empty associative array" since all arrays
* are associative arrays. If we use `array()` we get a JSON `[]`
*/
$attrs = $has_attrs
? json_decode( $matches['attrs'][0], /* as-associative */ true )
: array();

/*
* This state isn't allowed
* This is an error
*/
if ( $is_closer && ( $is_void || $has_attrs ) ) {
// we can ignore them since they don't hurt anything.
}
switch ( $delimiter->get_delimiter_type() ) {
case WP_Parsed_Block_Delimiter_Info::VOID:
return array( 'void-block', $name, $attrs, $delimiter_at, $delimiter_length );

if ( $is_void ) {
return array( 'void-block', $name, $attrs, $started_at, $length );
}
case WP_Parsed_Block_Delimiter_Info::CLOSER:
return array( 'block-closer', $name, null, $delimiter_at, $delimiter_length );

if ( $is_closer ) {
return array( 'block-closer', $name, null, $started_at, $length );
case WP_Parsed_Block_Delimiter_Info::OPENER:
return array( 'block-opener', $name, $attrs, $delimiter_at, $delimiter_length );
}

return array( 'block-opener', $name, $attrs, $started_at, $length );
}

/**
Expand Down
1 change: 1 addition & 0 deletions src/wp-settings.php
View file
Original file line number Diff line number Diff line change
Expand Up @@ -352,6 +352,7 @@
require ABSPATH . WPINC . '/class-wp-block-type-registry.php';
require ABSPATH . WPINC . '/class-wp-block.php';
require ABSPATH . WPINC . '/class-wp-block-list.php';
require ABSPATH . WPINC . '/block-parser/class-wp-parsed-block-delimiter-info.php';
require ABSPATH . WPINC . '/class-wp-block-parser-block.php';
require ABSPATH . WPINC . '/class-wp-block-parser-frame.php';
require ABSPATH . WPINC . '/class-wp-block-parser.php';
Expand Down

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