110 lines
2.8 KiB
PHP
110 lines
2.8 KiB
PHP
<?php
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namespace MailPoet\Newsletter\Editor;
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use pQuery;
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use MailPoet\Util\DOM as DOMUtil;
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if(!defined('ABSPATH')) exit;
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class StructureTransformer {
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function transform($content, $image_full_width) {
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$root = pQuery::parseStr($content);
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$this->hoistImagesToRoot($root);
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$structure = $this->transformTagsToBlocks($root, $image_full_width);
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$structure = $this->mergeNeighboringBlocks($structure);
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return $structure;
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}
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/**
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* Hoists images to root level, preserves order by splitting neighboring
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* elements and inserts tags as children of top ancestor
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*/
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protected function hoistImagesToRoot($root) {
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foreach($root->query('img') as $item) {
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$top_ancestor = DOMUtil::findTopAncestor($item);
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$offset = $top_ancestor->index();
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if($item->hasParent('a')) {
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$item = $item->parent;
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}
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DOMUtil::splitOn($item->getRoot(), $item);
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}
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}
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/**
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* Transforms HTML tags into their respective JSON objects,
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* turns other root children into text blocks
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*/
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private function transformTagsToBlocks($root, $image_full_width) {
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return array_map(function($item) use ($image_full_width) {
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if($item->tag === 'img' || $item->tag === 'a' && $item->query('img')) {
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if($item->tag === 'a') {
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$link = $item->getAttribute('href');
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$image = $item->children[0];
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} else {
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$link = '';
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$image = $item;
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}
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return array(
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'type' => 'image',
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'link' => $link,
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'src' => $image->getAttribute('src'),
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'alt' => $image->getAttribute('alt'),
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'fullWidth' => $image_full_width,
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'width' => $image->getAttribute('width'),
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'height' => $image->getAttribute('height'),
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'styles' => array(
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'block' => array(
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'textAlign' => 'center',
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),
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),
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);
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} else {
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return array(
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'type' => 'text',
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'text' => $item->toString()
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);
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}
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}, $root->children);
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}
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/**
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* Merges neighboring blocks when possible.
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* E.g. 2 adjacent text blocks may be combined into one.
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*/
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private function mergeNeighboringBlocks($structure) {
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$updated_structure = array();
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$text_accumulator = '';
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foreach($structure as $item) {
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if($item['type'] === 'text') {
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$text_accumulator .= $item['text'];
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}
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if($item['type'] !== 'text') {
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if(!empty($text_accumulator)) {
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$updated_structure[] = array(
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'type' => 'text',
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'text' => trim($text_accumulator),
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);
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$text_accumulator = '';
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}
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$updated_structure[] = $item;
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}
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}
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if(!empty($text_accumulator)) {
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$updated_structure[] = array(
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'type' => 'text',
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'text' => trim($text_accumulator),
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);
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}
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return $updated_structure;
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}
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}
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