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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. Props pento. Merges [43751] to trunk. See #45109. Built from https://develop.svn.wordpress.org/trunk@44116 git-svn-id: http://core.svn.wordpress.org/trunk@43946 1a063a9b-81f0-0310-95a4-ce76da25c4cd
474 lines
12 KiB
PHP
474 lines
12 KiB
PHP
<?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 !== $matches[ 'attrs' ][ 1 ];
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/*
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* Fun fact! It's not trivial in PHP to create "an empty associative array" since all arrays
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* are associative arrays. If we use `array()` we get a JSON `[]`
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*/
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$attrs = $has_attrs
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? json_decode( $matches[ 'attrs' ][ 0 ], /* as-associative */ true )
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: json_decode( '{}', /* don't ask why, just verify in PHP */ false );
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/*
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* This state isn't allowed
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* This is an error
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*/
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if ( $is_closer && ( $is_void || $has_attrs ) ) {
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// we can ignore them since they don't hurt anything
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}
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if ( $is_void ) {
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return array( 'void-block', $name, $attrs, $started_at, $length );
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}
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if ( $is_closer ) {
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return array( 'block-closer', $name, null, $started_at, $length );
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}
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return array( 'block-opener', $name, $attrs, $started_at, $length );
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}
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/**
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* Returns a new block object for freeform HTML
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*
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* @internal
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* @since 3.9.0
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*
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* @param string $innerHTML HTML content of block
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* @return WP_Block_Parser_Block freeform block object
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*/
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static function freeform( $innerHTML ) {
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return new WP_Block_Parser_Block( null, array(), array(), $innerHTML );
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}
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/**
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* Pushes a length of text from the input document
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* to the output list as a freeform block
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*
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* @internal
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* @since 3.8.0
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* @param null $length how many bytes of document text to output
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*/
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function add_freeform( $length = null ) {
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$length = $length ? $length : strlen( $this->document ) - $this->offset;
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if ( 0 === $length ) {
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return;
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}
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$this->output[] = (array) self::freeform( substr( $this->document, $this->offset, $length ) );
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}
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/**
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* Given a block structure from memory pushes
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* a new block to the output list
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*
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* @internal
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* @since 3.8.0
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* @param WP_Block_Parser_Block $block the block to add to the output
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* @param int $token_start byte offset into the document where the first token for the block starts
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* @param int $token_length byte length of entire block from start of opening token to end of closing token
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* @param int|null $last_offset last byte offset into document if continuing form earlier output
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*/
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function add_inner_block( WP_Block_Parser_Block $block, $token_start, $token_length, $last_offset = null ) {
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$parent = $this->stack[ count( $this->stack ) - 1 ];
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$parent->block->innerBlocks[] = $block;
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$parent->block->innerHTML .= substr( $this->document, $parent->prev_offset, $token_start - $parent->prev_offset );
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$parent->prev_offset = $last_offset ? $last_offset : $token_start + $token_length;
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}
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/**
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* Pushes the top block from the parsing stack to the output list
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*
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* @internal
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* @since 3.8.0
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* @param int|null $end_offset byte offset into document for where we should stop sending text output as HTML
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*/
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function add_block_from_stack( $end_offset = null ) {
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$stack_top = array_pop( $this->stack );
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$prev_offset = $stack_top->prev_offset;
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$stack_top->block->innerHTML .= isset( $end_offset )
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? substr( $this->document, $prev_offset, $end_offset - $prev_offset )
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: substr( $this->document, $prev_offset );
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if ( isset( $stack_top->leading_html_start ) ) {
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$this->output[] = (array) self::freeform( substr(
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$this->document,
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$stack_top->leading_html_start,
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$stack_top->token_start - $stack_top->leading_html_start
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) );
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}
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$this->output[] = (array) $stack_top->block;
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}
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}
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