Blocks: Introduce the block parser.
The `WP_Block_Parser` class, and the accompanying `parse_blocks()` helper function, can be used to parse an array of blocks out of a content string. `WP_Block_Parser` is copied from the `@wordpress/block-serialization-default-parser` package. To ensure it stays in sync with the JavaScript parser, changes should be implemented in the package first, then the package version should be upgraded to include the changes. See #45109. Built from https://develop.svn.wordpress.org/branches/5.0@43751 git-svn-id: http://core.svn.wordpress.org/branches/5.0@43580 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Gary Pendergast
parent
591a09dea0
commit
f7d01b4e70
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@ -112,3 +112,40 @@ function get_dynamic_block_names() {
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return $dynamic_block_names;
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return $dynamic_block_names;
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}
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}
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/**
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* Parses blocks out of a content string.
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*
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* @since 5.0.0
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*
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* @param string $content Post content.
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* @return array Array of parsed block objects.
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*/
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function parse_blocks( $content ) {
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/*
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* If there are no blocks in the content, return a single block, rather
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* than wasting time trying to parse the string.
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*/
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if ( ! has_blocks( $content ) ) {
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return array(
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array(
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'blockName' => null,
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'attrs' => array(),
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'innerBlocks' => array(),
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'innerHTML' => $content,
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),
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);
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}
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/**
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* Filter to allow plugins to replace the server-side block parser
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*
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* @since 5.0.0
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*
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* @param string $parser_class Name of block parser class
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*/
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$parser_class = apply_filters( 'block_parser_class', 'WP_Block_Parser' );
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$parser = new $parser_class();
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return $parser->parse( $content );
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}
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@ -0,0 +1,473 @@
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<?php
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/**
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* Class WP_Block_Parser_Block
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*
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* Holds the block structure in memory
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*
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* @since 3.8.0
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*/
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class WP_Block_Parser_Block {
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/**
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* Name of block
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*
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* @example "core/paragraph"
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*
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* @since 3.8.0
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* @var string
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*/
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public $blockName;
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/**
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* Optional set of attributes from block comment delimiters
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*
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* @example null
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* @example array( 'columns' => 3 )
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*
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* @since 3.8.0
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* @var array|null
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*/
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public $attrs;
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/**
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* List of inner blocks (of this same class)
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*
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* @since 3.8.0
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* @var WP_Block_Parser_Block[]
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*/
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public $innerBlocks;
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/**
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* Resultant HTML from inside block comment delimiters
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* after removing inner blocks
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*
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* @example "...Just <!-- wp:test /--> testing..." -> "Just testing..."
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*
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* @since 3.8.0
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* @var string
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*/
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public $innerHTML;
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function __construct( $name, $attrs, $innerBlocks, $innerHTML ) {
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$this->blockName = $name;
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$this->attrs = $attrs;
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$this->innerBlocks = $innerBlocks;
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$this->innerHTML = $innerHTML;
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}
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}
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/**
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* Class WP_Block_Parser_Frame
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*
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* Holds partial blocks in memory while parsing
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*
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* @internal
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* @since 3.8.0
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*/
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class WP_Block_Parser_Frame {
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/**
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* Full or partial block
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*
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* @since 3.8.0
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* @var WP_Block_Parser_Block
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*/
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public $block;
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/**
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* Byte offset into document for start of parse token
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*
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* @since 3.8.0
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* @var int
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*/
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public $token_start;
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/**
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* Byte length of entire parse token string
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*
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* @since 3.8.0
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* @var int
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*/
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public $token_length;
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/**
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* Byte offset into document for after parse token ends
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* (used during reconstruction of stack into parse production)
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*
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* @since 3.8.0
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* @var int
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*/
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public $prev_offset;
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/**
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* Byte offset into document where leading HTML before token starts
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*
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* @since 3.8.0
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* @var int
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*/
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public $leading_html_start;
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function __construct( $block, $token_start, $token_length, $prev_offset = null, $leading_html_start = null ) {
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$this->block = $block;
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$this->token_start = $token_start;
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$this->token_length = $token_length;
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$this->prev_offset = isset( $prev_offset ) ? $prev_offset : $token_start + $token_length;
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$this->leading_html_start = $leading_html_start;
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}
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}
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/**
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* Class WP_Block_Parser
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*
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* Parses a document and constructs a list of parsed block objects
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*
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* @since 3.8.0
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* @since 4.0.0 returns arrays not objects, all attributes are arrays
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*/
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class WP_Block_Parser {
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/**
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* Input document being parsed
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*
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* @example "Pre-text\n<!-- wp:paragraph -->This is inside a block!<!-- /wp:paragraph -->"
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*
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* @since 3.8.0
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* @var string
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*/
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public $document;
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/**
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* Tracks parsing progress through document
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*
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* @since 3.8.0
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* @var int
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*/
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public $offset;
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/**
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* List of parsed blocks
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*
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* @since 3.8.0
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* @var WP_Block_Parser_Block[]
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*/
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public $output;
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/**
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* Stack of partially-parsed structures in memory during parse
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*
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* @since 3.8.0
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* @var WP_Block_Parser_Frame[]
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*/
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public $stack;
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/**
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* Parses a document and returns a list of block structures
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*
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* When encountering an invalid parse will return a best-effort
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* parse. In contrast to the specification parser this does not
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* return an error on invalid inputs.
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*
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* @since 3.8.0
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*
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* @param string $document
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* @return WP_Block_Parser_Block[]
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*/
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function parse( $document ) {
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$this->document = $document;
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$this->offset = 0;
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$this->output = array();
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$this->stack = array();
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do {
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// twiddle our thumbs
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} while ( $this->proceed() );
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return $this->output;
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}
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/**
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* Processes the next token from the input document
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* and returns whether to proceed eating more tokens
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*
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* This is the "next step" function that essentially
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* takes a token as its input and decides what to do
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* with that token before descending deeper into a
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* nested block tree or continuing along the document
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* or breaking out of a level of nesting.
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*
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* @internal
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* @since 3.8.0
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* @return bool
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*/
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function proceed() {
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$next_token = $this->next_token();
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list( $token_type, $block_name, $attrs, $start_offset, $token_length ) = $next_token;
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$stack_depth = count( $this->stack );
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// we may have some HTML soup before the next block
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$leading_html_start = $start_offset > $this->offset ? $this->offset : null;
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switch ( $token_type ) {
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case 'no-more-tokens':
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// if not in a block then flush output
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if ( 0 === $stack_depth ) {
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$this->add_freeform();
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return false;
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}
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/*
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* Otherwise we have a problem
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* This is an error
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*
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* we have options
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* - treat it all as freeform text
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* - assume an implicit closer (easiest when not nesting)
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*/
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// for the easy case we'll assume an implicit closer
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if ( 1 === $stack_depth ) {
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$this->add_block_from_stack();
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return false;
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}
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/*
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* for the nested case where it's more difficult we'll
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* have to assume that multiple closers are missing
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* and so we'll collapse the whole stack piecewise
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*/
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while ( 0 < count( $this->stack ) ) {
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$this->add_block_from_stack();
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}
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return false;
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case 'void-block':
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/*
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* easy case is if we stumbled upon a void block
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* in the top-level of the document
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*/
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if ( 0 === $stack_depth ) {
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if ( isset( $leading_html_start ) ) {
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$this->output[] = (array) self::freeform( substr(
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$this->document,
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$leading_html_start,
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$start_offset - $leading_html_start
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) );
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}
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$this->output[] = (array) new WP_Block_Parser_Block( $block_name, $attrs, array(), '' );
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$this->offset = $start_offset + $token_length;
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return true;
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}
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// otherwise we found an inner block
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$this->add_inner_block(
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new WP_Block_Parser_Block( $block_name, $attrs, array(), '' ),
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$start_offset,
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$token_length
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);
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$this->offset = $start_offset + $token_length;
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return true;
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case 'block-opener':
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// track all newly-opened blocks on the stack
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array_push( $this->stack, new WP_Block_Parser_Frame(
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new WP_Block_Parser_Block( $block_name, $attrs, array(), '' ),
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$start_offset,
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$token_length,
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$start_offset + $token_length,
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$leading_html_start
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) );
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$this->offset = $start_offset + $token_length;
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return true;
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case 'block-closer':
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/*
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* if we're missing an opener we're in trouble
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* This is an error
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*/
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if ( 0 === $stack_depth ) {
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/*
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* we have options
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* - assume an implicit opener
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* - assume _this_ is the opener
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* - give up and close out the document
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*/
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$this->add_freeform();
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return false;
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}
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// if we're not nesting then this is easy - close the block
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if ( 1 === $stack_depth ) {
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$this->add_block_from_stack( $start_offset );
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$this->offset = $start_offset + $token_length;
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return true;
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}
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/*
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* otherwise we're nested and we have to close out the current
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* block and add it as a new innerBlock to the parent
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*/
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$stack_top = array_pop( $this->stack );
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$stack_top->block->innerHTML .= substr( $this->document, $stack_top->prev_offset, $start_offset - $stack_top->prev_offset );
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$stack_top->prev_offset = $start_offset + $token_length;
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$this->add_inner_block(
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$stack_top->block,
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$stack_top->token_start,
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$stack_top->token_length,
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$start_offset + $token_length
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);
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$this->offset = $start_offset + $token_length;
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return true;
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default:
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// This is an error
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$this->add_freeform();
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return false;
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}
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}
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/**
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* Scans the document from where we last left off
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* and finds the next valid token to parse if it exists
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*
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* Returns the type of the find: kind of find, block information, attributes
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*
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* @internal
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* @since 3.8.0
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* @return array
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*/
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function next_token() {
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$matches = null;
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/*
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* aye the magic
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* we're using a single RegExp to tokenize the block comment delimiters
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* we're also using a trick here because the only difference between a
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* block opener and a block closer is the leading `/` before `wp:` (and
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* a closer has no attributes). we can trap them both and process the
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* match back in PHP to see which one it was.
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*/
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$has_match = preg_match(
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'/<!--\s+(?<closer>\/)?wp:(?<namespace>[a-z][a-z0-9_-]*\/)?(?<name>[a-z][a-z0-9_-]*)\s+(?<attrs>{(?:(?!}\s+-->).)+?}\s+)?(?<void>\/)?-->/s',
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$this->document,
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$matches,
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PREG_OFFSET_CAPTURE,
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$this->offset
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);
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// we have no more tokens
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if ( 0 === $has_match ) {
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return array( 'no-more-tokens', null, null, null, null );
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}
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list( $match, $started_at ) = $matches[ 0 ];
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$length = strlen( $match );
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$is_closer = isset( $matches[ 'closer' ] ) && -1 !== $matches[ 'closer' ][ 1 ];
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$is_void = isset( $matches[ 'void' ] ) && -1 !== $matches[ 'void' ][ 1 ];
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$namespace = $matches[ 'namespace' ];
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$namespace = ( isset( $namespace ) && -1 !== $namespace[ 1 ] ) ? $namespace[ 0 ] : 'core/';
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$name = $namespace . $matches[ 'name' ][ 0 ];
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$has_attrs = isset( $matches[ 'attrs' ] ) && -1 !== $matches[ 'attrs' ][ 1 ];
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||||||
|
/*
|
||||||
|
* 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 )
|
||||||
|
: json_decode( '{}', /* don't ask why, just verify in PHP */ false );
|
||||||
|
|
||||||
|
/*
|
||||||
|
* 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
|
||||||
|
}
|
||||||
|
|
||||||
|
if ( $is_void ) {
|
||||||
|
return array( 'void-block', $name, $attrs, $started_at, $length );
|
||||||
|
}
|
||||||
|
|
||||||
|
if ( $is_closer ) {
|
||||||
|
return array( 'block-closer', $name, null, $started_at, $length );
|
||||||
|
}
|
||||||
|
|
||||||
|
return array( 'block-opener', $name, $attrs, $started_at, $length );
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Returns a new block object for freeform HTML
|
||||||
|
*
|
||||||
|
* @internal
|
||||||
|
* @since 3.9.0
|
||||||
|
*
|
||||||
|
* @param string $innerHTML HTML content of block
|
||||||
|
* @return WP_Block_Parser_Block freeform block object
|
||||||
|
*/
|
||||||
|
static function freeform( $innerHTML ) {
|
||||||
|
return new WP_Block_Parser_Block( null, array(), array(), $innerHTML );
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Pushes a length of text from the input document
|
||||||
|
* to the output list as a freeform block
|
||||||
|
*
|
||||||
|
* @internal
|
||||||
|
* @since 3.8.0
|
||||||
|
* @param null $length how many bytes of document text to output
|
||||||
|
*/
|
||||||
|
function add_freeform( $length = null ) {
|
||||||
|
$length = $length ? $length : strlen( $this->document ) - $this->offset;
|
||||||
|
|
||||||
|
if ( 0 === $length ) {
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
|
||||||
|
$this->output[] = (array) self::freeform( substr( $this->document, $this->offset, $length ) );
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Given a block structure from memory pushes
|
||||||
|
* a new block to the output list
|
||||||
|
*
|
||||||
|
* @internal
|
||||||
|
* @since 3.8.0
|
||||||
|
* @param WP_Block_Parser_Block $block the block to add to the output
|
||||||
|
* @param int $token_start byte offset into the document where the first token for the block starts
|
||||||
|
* @param int $token_length byte length of entire block from start of opening token to end of closing token
|
||||||
|
* @param int|null $last_offset last byte offset into document if continuing form earlier output
|
||||||
|
*/
|
||||||
|
function add_inner_block( WP_Block_Parser_Block $block, $token_start, $token_length, $last_offset = null ) {
|
||||||
|
$parent = $this->stack[ count( $this->stack ) - 1 ];
|
||||||
|
$parent->block->innerBlocks[] = $block;
|
||||||
|
$parent->block->innerHTML .= substr( $this->document, $parent->prev_offset, $token_start - $parent->prev_offset );
|
||||||
|
$parent->prev_offset = $last_offset ? $last_offset : $token_start + $token_length;
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Pushes the top block from the parsing stack to the output list
|
||||||
|
*
|
||||||
|
* @internal
|
||||||
|
* @since 3.8.0
|
||||||
|
* @param int|null $end_offset byte offset into document for where we should stop sending text output as HTML
|
||||||
|
*/
|
||||||
|
function add_block_from_stack( $end_offset = null ) {
|
||||||
|
$stack_top = array_pop( $this->stack );
|
||||||
|
$prev_offset = $stack_top->prev_offset;
|
||||||
|
|
||||||
|
$stack_top->block->innerHTML .= isset( $end_offset )
|
||||||
|
? substr( $this->document, $prev_offset, $end_offset - $prev_offset )
|
||||||
|
: substr( $this->document, $prev_offset );
|
||||||
|
|
||||||
|
if ( isset( $stack_top->leading_html_start ) ) {
|
||||||
|
$this->output[] = (array) self::freeform( substr(
|
||||||
|
$this->document,
|
||||||
|
$stack_top->leading_html_start,
|
||||||
|
$stack_top->token_start - $stack_top->leading_html_start
|
||||||
|
) );
|
||||||
|
}
|
||||||
|
|
||||||
|
$this->output[] = (array) $stack_top->block;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
@ -4,7 +4,7 @@
|
||||||
*
|
*
|
||||||
* @global string $wp_version
|
* @global string $wp_version
|
||||||
*/
|
*/
|
||||||
$wp_version = '5.0-alpha-43750';
|
$wp_version = '5.0-alpha-43751';
|
||||||
|
|
||||||
/**
|
/**
|
||||||
* Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.
|
* Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.
|
||||||
|
|
|
||||||
|
|
@ -245,6 +245,7 @@ require( ABSPATH . WPINC . '/rest-api/search/class-wp-rest-search-handler.php' )
|
||||||
require( ABSPATH . WPINC . '/rest-api/search/class-wp-rest-post-search-handler.php' );
|
require( ABSPATH . WPINC . '/rest-api/search/class-wp-rest-post-search-handler.php' );
|
||||||
require( ABSPATH . WPINC . '/class-wp-block-type.php' );
|
require( ABSPATH . WPINC . '/class-wp-block-type.php' );
|
||||||
require( ABSPATH . WPINC . '/class-wp-block-type-registry.php' );
|
require( ABSPATH . WPINC . '/class-wp-block-type-registry.php' );
|
||||||
|
require( ABSPATH . WPINC . '/class-wp-block-parser.php' );
|
||||||
require( ABSPATH . WPINC . '/blocks.php' );
|
require( ABSPATH . WPINC . '/blocks.php' );
|
||||||
|
|
||||||
$GLOBALS['wp_embed'] = new WP_Embed();
|
$GLOBALS['wp_embed'] = new WP_Embed();
|
||||||
|
|
|
||||||
Loading…
Reference in New Issue