WPHTML Converter

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Convert WordPress block HTML to its JavaScript object or PHP array forms.

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Copy code

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Built by Happy Prime, contributors welcome.

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} innerContent Inner content. 29 | */ 30 | 31 | /** 32 | * @typedef {Object} ParsedFrame 33 | * @property {ParsedBlock} block Block. 34 | * @property {number} tokenStart Token start. 35 | * @property {number} tokenLength Token length. 36 | * @property {number} prevOffset Previous offset. 37 | * @property {number|null} leadingHtmlStart Leading HTML start. 38 | */ 39 | 40 | /** 41 | * @typedef {'no-more-tokens'|'void-block'|'block-opener'|'block-closer'} TokenType 42 | */ 43 | 44 | /** 45 | * @typedef {[TokenType, string, Attributes, number, number]} Token 46 | */ 47 | 48 | /** 49 | * Matches block comment delimiters 50 | * 51 | * While most of this pattern is straightforward the attribute parsing 52 | * incorporates a tricks to make sure we don't choke on specific input 53 | * 54 | * - since JavaScript has no possessive quantifier or atomic grouping 55 | * we are emulating it with a trick 56 | * 57 | * we want a possessive quantifier or atomic group to prevent backtracking 58 | * on the `}`s should we fail to match the remainder of the pattern 59 | * 60 | * we can emulate this with a positive lookahead and back reference 61 | * (a++)*c === ((?=(a+))\1)*c 62 | * 63 | * let's examine an example: 64 | * - /(a+)*c/.test('aaaaaaaaaaaaad') fails after over 49,000 steps 65 | * - /(a++)*c/.test('aaaaaaaaaaaaad') fails after 85 steps 66 | * - /(?>a+)*c/.test('aaaaaaaaaaaaad') fails after 126 steps 67 | * 68 | * this is because the possessive `++` and the atomic group `(?>)` 69 | * tell the engine that all those `a`s belong together as a single group 70 | * and so it won't split it up when stepping backwards to try and match 71 | * 72 | * if we use /((?=(a+))\1)*c/ then we get the same behavior as the atomic group 73 | * or possessive and prevent the backtracking because the `a+` is matched but 74 | * not captured. thus, we find the long string of `a`s and remember it, then 75 | * reference it as a whole unit inside our pattern 76 | * 77 | * @see http://instanceof.me/post/52245507631/regex-emulate-atomic-grouping-with-lookahead 78 | * @see http://blog.stevenlevithan.com/archives/mimic-atomic-groups 79 | * @see https://javascript.info/regexp-infinite-backtracking-problem 80 | * 81 | * once browsers reliably support atomic grouping or possessive 82 | * quantifiers natively we should remove this trick and simplify 83 | * 84 | * @type {RegExp} 85 | * 86 | * @since 3.8.0 87 | * @since 4.6.1 added optimization to prevent backtracking on attribute parsing 88 | */ 89 | const tokenizer = 90 | /)[^])*)\5|[^]*?)}\s+)?(\/)?-->/g; 91 | 92 | /** 93 | * Constructs a block object. 94 | * 95 | * @param {string|null} blockName 96 | * @param {Attributes} attrs 97 | * @param {ParsedBlock[]} innerBlocks 98 | * @param {string} innerHTML 99 | * @param {string[]} innerContent 100 | * @return {ParsedBlock} The block object. 101 | */ 102 | function Block( blockName, attrs, innerBlocks, innerHTML, innerContent ) { 103 | return { 104 | blockName, 105 | attrs, 106 | innerBlocks, 107 | innerHTML, 108 | innerContent, 109 | }; 110 | } 111 | 112 | /** 113 | * Constructs a freeform block object. 114 | * 115 | * @param {string} innerHTML 116 | * @return {ParsedBlock} The freeform block object. 117 | */ 118 | function Freeform( innerHTML ) { 119 | return Block( null, {}, [], innerHTML, [ innerHTML ] ); 120 | } 121 | 122 | /** 123 | * Constructs a frame object. 124 | * 125 | * @param {ParsedBlock} block 126 | * @param {number} tokenStart 127 | * @param {number} tokenLength 128 | * @param {number} prevOffset 129 | * @param {number|null} leadingHtmlStart 130 | * @return {ParsedFrame} The frame object. 131 | */ 132 | function Frame( block, tokenStart, tokenLength, prevOffset, leadingHtmlStart ) { 133 | return { 134 | block, 135 | tokenStart, 136 | tokenLength, 137 | prevOffset: prevOffset || tokenStart + tokenLength, 138 | leadingHtmlStart, 139 | }; 140 | } 141 | 142 | /** 143 | * Parser function, that converts input HTML into a block based structure. 144 | * 145 | * @param {string} doc The HTML document to parse. 146 | * 147 | * @example 148 | * Input post: 149 | * ```html 150 | * 151 | *

152 | *

153 | *

Left

154 | *

155 | * 156 | * 157 | * 158 | *

159 | *

Middle

160 | *

161 | * 162 | * 163 | * 164 | *

165 | *

166 | * 167 | * ``` 168 | * 169 | * Parsing code: 170 | * ```js 171 | * import { parse } from '@wordpress/block-serialization-default-parser'; 172 | * 173 | * parse( post ) === [ 174 | * { 175 | * blockName: "core/columns", 176 | * attrs: { 177 | * columns: 3 178 | * }, 179 | * innerBlocks: [ 180 | * { 181 | * blockName: "core/column", 182 | * attrs: null, 183 | * innerBlocks: [ 184 | * { 185 | * blockName: "core/paragraph", 186 | * attrs: null, 187 | * innerBlocks: [], 188 | * innerHTML: "\n

Left

\n" 189 | * } 190 | * ], 191 | * innerHTML: '\n

\n' 192 | * }, 193 | * { 194 | * blockName: "core/column", 195 | * attrs: null, 196 | * innerBlocks: [ 197 | * { 198 | * blockName: "core/paragraph", 199 | * attrs: null, 200 | * innerBlocks: [], 201 | * innerHTML: "\n

Middle

\n" 202 | * } 203 | * ], 204 | * innerHTML: '\n

\n' 205 | * }, 206 | * { 207 | * blockName: "core/column", 208 | * attrs: null, 209 | * innerBlocks: [], 210 | * innerHTML: '\n

\n' 211 | * } 212 | * ], 213 | * innerHTML: '\n

\n\n\n\n

\n' 214 | * } 215 | * ]; 216 | * ``` 217 | * @return {ParsedBlock[]} A block-based representation of the input HTML. 218 | */ 219 | export const parse = ( doc ) => { 220 | document = doc; 221 | offset = 0; 222 | output = []; 223 | stack = []; 224 | tokenizer.lastIndex = 0; 225 | 226 | do { 227 | // twiddle our thumbs 228 | } while ( proceed() ); 229 | 230 | return output; 231 | }; 232 | 233 | /** 234 | * Parses the next token in the input document. 235 | * 236 | * @return {boolean} Returns true when there is more tokens to parse. 237 | */ 238 | function proceed() { 239 | const stackDepth = stack.length; 240 | const next = nextToken(); 241 | const [ tokenType, blockName, attrs, startOffset, tokenLength ] = next; 242 | 243 | // We may have some HTML soup before the next block. 244 | const leadingHtmlStart = startOffset > offset ? offset : null; 245 | 246 | switch ( tokenType ) { 247 | case 'no-more-tokens': 248 | // If not in a block then flush output. 249 | if ( 0 === stackDepth ) { 250 | addFreeform(); 251 | return false; 252 | } 253 | 254 | // Otherwise we have a problem 255 | // This is an error 256 | // we have options 257 | // - treat it all as freeform text 258 | // - assume an implicit closer (easiest when not nesting) 259 | 260 | // For the easy case we'll assume an implicit closer. 261 | if ( 1 === stackDepth ) { 262 | addBlockFromStack(); 263 | return false; 264 | } 265 | 266 | // For the nested case where it's more difficult we'll 267 | // have to assume that multiple closers are missing 268 | // and so we'll collapse the whole stack piecewise. 269 | while ( 0 < stack.length ) { 270 | addBlockFromStack(); 271 | } 272 | return false; 273 | case 'void-block': 274 | // easy case is if we stumbled upon a void block 275 | // in the top-level of the document. 276 | if ( 0 === stackDepth ) { 277 | if ( null !== leadingHtmlStart ) { 278 | output.push( 279 | Freeform( 280 | document.substr( 281 | leadingHtmlStart, 282 | startOffset - leadingHtmlStart 283 | ) 284 | ) 285 | ); 286 | } 287 | output.push( Block( blockName, attrs, [], '', [] ) ); 288 | offset = startOffset + tokenLength; 289 | return true; 290 | } 291 | 292 | // Otherwise we found an inner block. 293 | addInnerBlock( 294 | Block( blockName, attrs, [], '', [] ), 295 | startOffset, 296 | tokenLength 297 | ); 298 | offset = startOffset + tokenLength; 299 | return true; 300 | 301 | case 'block-opener': 302 | // Track all newly-opened blocks on the stack. 303 | stack.push( 304 | Frame( 305 | Block( blockName, attrs, [], '', [] ), 306 | startOffset, 307 | tokenLength, 308 | startOffset + tokenLength, 309 | leadingHtmlStart 310 | ) 311 | ); 312 | offset = startOffset + tokenLength; 313 | return true; 314 | 315 | case 'block-closer': 316 | // If we're missing an opener we're in trouble 317 | // This is an error. 318 | if ( 0 === stackDepth ) { 319 | // We have options 320 | // - assume an implicit opener 321 | // - assume _this_ is the opener 322 | // - give up and close out the document. 323 | addFreeform(); 324 | return false; 325 | } 326 | 327 | // If we're not nesting then this is easy - close the block. 328 | if ( 1 === stackDepth ) { 329 | addBlockFromStack( startOffset ); 330 | offset = startOffset + tokenLength; 331 | return true; 332 | } 333 | 334 | // Otherwise we're nested and we have to close out the current 335 | // block and add it as a innerBlock to the parent. 336 | const stackTop = /** @type {ParsedFrame} */ ( stack.pop() ); 337 | const html = document.substr( 338 | stackTop.prevOffset, 339 | startOffset - stackTop.prevOffset 340 | ); 341 | stackTop.block.innerHTML += html; 342 | stackTop.block.innerContent.push( html ); 343 | stackTop.prevOffset = startOffset + tokenLength; 344 | 345 | addInnerBlock( 346 | stackTop.block, 347 | stackTop.tokenStart, 348 | stackTop.tokenLength, 349 | startOffset + tokenLength 350 | ); 351 | offset = startOffset + tokenLength; 352 | return true; 353 | 354 | default: 355 | // This is an error. 356 | addFreeform(); 357 | return false; 358 | } 359 | } 360 | 361 | /** 362 | * Parse JSON if valid, otherwise return null 363 | * 364 | * Note that JSON coming from the block comment 365 | * delimiters is constrained to be an object 366 | * and cannot be things like `true` or `null` 367 | * 368 | * @param {string} input JSON input string to parse 369 | * @return {Object|null} parsed JSON if valid 370 | */ 371 | function parseJSON( input ) { 372 | try { 373 | return JSON.parse( input ); 374 | } catch ( e ) { 375 | return null; 376 | } 377 | } 378 | 379 | /** 380 | * Finds the next token in the document. 381 | * 382 | * @return {Token} The next matched token. 383 | */ 384 | function nextToken() { 385 | // Aye the magic 386 | // we're using a single RegExp to tokenize the block comment delimiters 387 | // we're also using a trick here because the only difference between a 388 | // block opener and a block closer is the leading `/` before `wp:` (and 389 | // a closer has no attributes). we can trap them both and process the 390 | // match back in JavaScript to see which one it was. 391 | const matches = tokenizer.exec( document ); 392 | 393 | // We have no more tokens. 394 | if ( null === matches ) { 395 | return [ 'no-more-tokens', '', null, 0, 0 ]; 396 | } 397 | 398 | const startedAt = matches.index; 399 | const [ 400 | match, 401 | closerMatch, 402 | namespaceMatch, 403 | nameMatch, 404 | attrsMatch /* Internal/unused. */, 405 | , 406 | voidMatch, 407 | ] = matches; 408 | 409 | const length = match.length; 410 | const isCloser = !! closerMatch; 411 | const isVoid = !! voidMatch; 412 | const namespace = namespaceMatch || 'core/'; 413 | const name = namespace + nameMatch; 414 | const hasAttrs = !! attrsMatch; 415 | const attrs = hasAttrs ? parseJSON( attrsMatch ) : {}; 416 | 417 | // This state isn't allowed 418 | // This is an error. 419 | if ( isCloser && ( isVoid || hasAttrs ) ) { 420 | // We can ignore them since they don't hurt anything 421 | // we may warn against this at some point or reject it. 422 | } 423 | 424 | if ( isVoid ) { 425 | return [ 'void-block', name, attrs, startedAt, length ]; 426 | } 427 | 428 | if ( isCloser ) { 429 | return [ 'block-closer', name, null, startedAt, length ]; 430 | } 431 | 432 | return [ 'block-opener', name, attrs, startedAt, length ]; 433 | } 434 | 435 | /** 436 | * Adds a freeform block to the output. 437 | * 438 | * @param {number} [rawLength] 439 | */ 440 | function addFreeform( rawLength ) { 441 | const length = rawLength ? rawLength : document.length - offset; 442 | 443 | if ( 0 === length ) { 444 | return; 445 | } 446 | 447 | output.push( Freeform( document.substr( offset, length ) ) ); 448 | } 449 | 450 | /** 451 | * Adds inner block to the parent block. 452 | * 453 | * @param {ParsedBlock} block 454 | * @param {number} tokenStart 455 | * @param {number} tokenLength 456 | * @param {number} [lastOffset] 457 | */ 458 | function addInnerBlock( block, tokenStart, tokenLength, lastOffset ) { 459 | const parent = stack[ stack.length - 1 ]; 460 | parent.block.innerBlocks.push( block ); 461 | const html = document.substr( 462 | parent.prevOffset, 463 | tokenStart - parent.prevOffset 464 | ); 465 | 466 | if ( html ) { 467 | parent.block.innerHTML += html; 468 | parent.block.innerContent.push( html ); 469 | } 470 | 471 | parent.block.innerContent.push( null ); 472 | parent.prevOffset = lastOffset ? lastOffset : tokenStart + tokenLength; 473 | } 474 | 475 | /** 476 | * Adds block from the stack to the output. 477 | * 478 | * @param {number} [endOffset] 479 | */ 480 | function addBlockFromStack( endOffset ) { 481 | const { block, leadingHtmlStart, prevOffset, tokenStart } = 482 | /** @type {ParsedFrame} */ ( stack.pop() ); 483 | 484 | const html = endOffset 485 | ? document.substr( prevOffset, endOffset - prevOffset ) 486 | : document.substr( prevOffset ); 487 | 488 | if ( html ) { 489 | block.innerHTML += html; 490 | block.innerContent.push( html ); 491 | } 492 | 493 | if ( null !== leadingHtmlStart ) { 494 | output.push( 495 | Freeform( 496 | document.substr( 497 | leadingHtmlStart, 498 | tokenStart - leadingHtmlStart 499 | ) 500 | ) 501 | ); 502 | } 503 | 504 | output.push( block ); 505 | } 506 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | WPHTML Converter 2 | 3 | Copyright 2023, Happy Prime and contributors 4 | 5 | This program is free software; you can redistribute it and/or modify 6 | it under the terms of the GNU General Public License as published by 7 | the Free Software Foundation; either version 2 of the License, or 8 | (at your option) any later version. 9 | 10 | This program is distributed in the hope that it will be useful, 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 | GNU General Public License for more details. 14 | 15 | You should have received a copy of the GNU General Public License 16 | along with this program; if not, write to the Free Software 17 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 18 | 19 | This program is distributed alongside work covered by the following copyright and 20 | permission notices: 21 | 22 | Block Serialization Default Parser is authored by The WordPress Contributors 23 | and licensed as GPL 2.0 or later. 24 | 25 | =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= 26 | 27 | GNU GENERAL PUBLIC LICENSE 28 | Version 2, June 1991 29 | 30 | Copyright (C) 1989, 1991 Free Software Foundation, Inc., 31 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 32 | Everyone is permitted to copy and distribute verbatim copies 33 | of this license document, but changing it is not allowed. 34 | 35 | Preamble 36 | 37 | The licenses for most software are designed to take away your 38 | freedom to share and change it. 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IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 297 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR 298 | REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, 299 | INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING 300 | OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED 301 | TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY 302 | YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER 303 | PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE 304 | POSSIBILITY OF SUCH DAMAGES. 305 | 306 | END OF TERMS AND CONDITIONS 307 | 308 | How to Apply These Terms to Your New Programs 309 | 310 | If you develop a new program, and you want it to be of the greatest 311 | possible use to the public, the best way to achieve this is to make it 312 | free software which everyone can redistribute and change under these terms. 313 | 314 | To do so, attach the following notices to the program. It is safest 315 | to attach them to the start of each source file to most effectively 316 | convey the exclusion of warranty; and each file should have at least 317 | the "copyright" line and a pointer to where the full notice is found. 318 | 319 | 320 | Copyright (C) 321 | 322 | This program is free software; you can redistribute it and/or modify 323 | it under the terms of the GNU General Public License as published by 324 | the Free Software Foundation; either version 2 of the License, or 325 | (at your option) any later version. 326 | 327 | This program is distributed in the hope that it will be useful, 328 | but WITHOUT ANY WARRANTY; without even the implied warranty of 329 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 330 | GNU General Public License for more details. 331 | 332 | You should have received a copy of the GNU General Public License along 333 | with this program; if not, write to the Free Software Foundation, Inc., 334 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 335 | 336 | Also add information on how to contact you by electronic and paper mail. 337 | 338 | If the program is interactive, make it output a short notice like this 339 | when it starts in an interactive mode: 340 | 341 | Gnomovision version 69, Copyright (C) year name of author 342 | Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 343 | This is free software, and you are welcome to redistribute it 344 | under certain conditions; type `show c' for details. 345 | 346 | The hypothetical commands `show w' and `show c' should show the appropriate 347 | parts of the General Public License. Of course, the commands you use may 348 | be called something other than `show w' and `show c'; they could even be 349 | mouse-clicks or menu items--whatever suits your program. 350 | 351 | You should also get your employer (if you work as a programmer) or your 352 | school, if any, to sign a "copyright disclaimer" for the program, if 353 | necessary. Here is a sample; alter the names: 354 | 355 | Yoyodyne, Inc., hereby disclaims all copyright interest in the program 356 | `Gnomovision' (which makes passes at compilers) written by James Hacker. 357 | 358 | , 1 April 1989 359 | Ty Coon, President of Vice 360 | 361 | This General Public License does not permit incorporating your program into 362 | proprietary programs. If your program is a subroutine library, you may 363 | consider it more useful to permit linking proprietary applications with the 364 | library. If this is what you want to do, use the GNU Lesser General 365 | Public License instead of this License. 366 | 367 | WRITTEN OFFER 368 | 369 | The source code for any program binaries or compressed scripts that are 370 | included with WPHTML Converter can be freely obtained at the following URL: 371 | 372 | https://github.com/happyprime/wphtml-converter/ 373 | --------------------------------------------------------------------------------