Gary Pendergast 570fc2a5b0 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.



git-svn-id: https://develop.svn.wordpress.org/branches/5.0@43751 602fd350-edb4-49c9-b593-d223f7449a82
2018-10-18 04:39:40 +00:00
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