Press n or j to go to the next uncovered block, b, p or k for the previous block.
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* Direct Peritext `Fragment` to Slate `Descendant[]` converter with caching.
*
* Implements a double-buffered cache keyed by Peritext `Block.hash`, which lets
* unchanged sub-trees be reused across renders so that React's reconciler can
* skip re-rendering unchanged components.
*/
import {Slice} from 'json-joy/lib/json-crdt-extensions/peritext/slice/Slice';
import {type Block, LeafBlock, type Inline} from 'json-joy/lib/json-crdt-extensions/peritext';
import type {Fragment} from 'json-joy/lib/json-crdt-extensions/peritext/block/Fragment';
import type {SlateDocument, SlateElementNode, SlateTextNode} from '../types';
/**
* Double-buffered cache for Slate element nodes, keyed by Peritext Block hash.
* Entries that are not accessed during the current render pass are dropped at
* the next {@link SlateNodeCache.gc} call.
*/
class SlateNodeCache {
/** Entries written/read during the *current* render pass. */
private curr: Map<number, SlateElementNode> = new Map();
/** Entries from the *previous* render pass (read-only during current). */
private prev: Map<number, SlateElementNode> = new Map();
get(hash: number): SlateElementNode | undefined {
const curr = this.curr;
let node = curr.get(hash);
Iif (node !== undefined) return node;
node = this.prev.get(hash);
if (node !== undefined) curr.set(hash, node);
return node;
}
set(hash: number, node: SlateElementNode): void {
this.curr.set(hash, node);
}
/** Call once at the **end** of each render pass. Drops entries not accessed
* during this render. */
gc(): void {
this.prev = this.curr;
this.curr = new Map();
}
}
/**
* Stateful converter that turns a Peritext `Fragment` into a Slate
* `Descendant[]` document, reusing unchanged sub-trees via {@link SlateNodeCache}.
*
* Because unchanged blocks return the **same object reference**, React's
* reconciler (and Slate's `onChange` diffing) can skip re-rendering them.
*/
export class ToSlateNode {
public readonly cache = new SlateNodeCache();
convert(fragment: Fragment<string>): SlateDocument {
const root = fragment.root;
const blockChildren = root.children;
const length = blockChildren.length;
const result: SlateElementNode[] = [];
const cache = this.cache;
for (let i = 0; i < length; i++) {
const block = blockChildren[i];
const cached = cache.get(block.hash);
if (cached) {
result.push(cached);
continue;
}
const node = this.convBlock(block);
result.push(node);
}
cache.gc();
return result;
}
private convBlock(block: Block | LeafBlock): SlateElementNode {
const hash = block.hash;
const cached = this.cache.get(hash);
Iif (cached) return cached;
const node = this.buildBlock(block);
this.cache.set(hash, node);
return node;
}
private buildBlock(block: Block | LeafBlock): SlateElementNode {
if (block instanceof LeafBlock) {
const textChildren: SlateTextNode[] = [];
for (let iterator = block.texts0(), inline: Inline | undefined; (inline = iterator()); ) {
const text = inline.text();
const attr = inline.attr();
const attrKeys = Object.keys(attr);
if (!text && attrKeys.length === 0) continue;
const textNode: SlateTextNode = {text: text || ''};
const length = attrKeys.length;
ATTRS: for (let i = 0; i < length; i++) {
const tag = attrKeys[i];
const stack = attr[tag];
Iif (!stack || stack.length <= 0) continue ATTRS;
const slice = stack[0].slice;
Iif (!(slice instanceof Slice)) continue ATTRS;
const data = slice.data();
if (data && typeof data === 'object' && !Array.isArray(data)) Object.assign(textNode, {[tag]: data});
else textNode[tag] = data !== undefined ? data : true;
}
textChildren.push(textNode);
}
const node: SlateElementNode = {
type: block.tag() + '',
children: textChildren.length ? textChildren : [{text: ''}],
};
const attr = block.attr();
Eif (attr && typeof attr === 'object') Object.assign(node, attr);
return node;
} else {
const childBlocks = block.children;
const len = childBlocks.length;
const children: SlateElementNode[] = new Array(len);
for (let i = 0; i < len; i++) children[i] = this.convBlock(childBlocks[i]);
const attr = block.attr();
const node: SlateElementNode = {
...(attr && typeof attr === 'object' ? attr : {}),
type: block.tag() + '',
children: len ? children : [{text: ''}],
};
return node;
}
}
}
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