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block.js
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block.js
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import extend from 'extend';
import Delta from 'quill-delta';
import Parchment from 'parchment';
import Break from './break';
import Inline from './inline';
import TextBlot from './text';
const NEWLINE_LENGTH = 1;
class Block extends Parchment.Block {
constructor(domNode) {
super(domNode);
this.cache = {};
}
delta() {
if (this.cache.delta == null) {
this.cache.delta = this.descendants(Parchment.Leaf)
.reduce((delta, leaf) => {
if (leaf.length() === 0) {
return delta;
}
return delta.insert(leaf.value(), bubbleFormats(leaf));
}, new Delta())
.insert('\n', bubbleFormats(this));
}
return this.cache.delta;
}
deleteAt(index, length) {
super.deleteAt(index, length);
this.cache = {};
}
formatAt(index, length, name, value) {
if (length <= 0) return;
if (Parchment.query(name, Parchment.Scope.BLOCK)) {
if (index + length === this.length()) {
this.format(name, value);
}
} else {
super.formatAt(
index,
Math.min(length, this.length() - index - 1),
name,
value,
);
}
this.cache = {};
}
insertAt(index, value, def) {
if (def != null) {
super.insertAt(index, value, def);
return;
}
if (value.length === 0) return;
const lines = value.split('\n');
const text = lines.shift();
if (text.length > 0) {
if (index < this.length() - 1 || this.children.tail == null) {
super.insertAt(Math.min(index, this.length() - 1), text);
} else {
this.children.tail.insertAt(this.children.tail.length(), text);
}
this.cache = {};
}
let block = this;
lines.reduce((lineIndex, line) => {
block = block.split(lineIndex, true);
block.insertAt(0, line);
return line.length;
}, index + text.length);
}
insertBefore(blot, ref) {
const { head } = this.children;
super.insertBefore(blot, ref);
if (head instanceof Break) {
head.remove();
}
this.cache = {};
}
length() {
if (this.cache.length == null) {
this.cache.length = super.length() + NEWLINE_LENGTH;
}
return this.cache.length;
}
moveChildren(target, ref) {
super.moveChildren(target, ref);
this.cache = {};
}
optimize(context) {
super.optimize(context);
this.cache = {};
}
path(index) {
return super.path(index, true);
}
removeChild(child) {
super.removeChild(child);
this.cache = {};
}
split(index, force = false) {
if (force && (index === 0 || index >= this.length() - NEWLINE_LENGTH)) {
const clone = this.clone();
if (index === 0) {
this.parent.insertBefore(clone, this);
return this;
}
this.parent.insertBefore(clone, this.next);
return clone;
}
const next = super.split(index, force);
this.cache = {};
return next;
}
}
Block.blotName = 'block';
Block.tagName = 'P';
Block.defaultChild = Break;
Block.allowedChildren = [Inline, Parchment.Embed, TextBlot];
class BlockEmbed extends Parchment.Embed {
attach() {
super.attach();
this.attributes = new Parchment.Attributor.Store(this.domNode);
}
delta() {
return new Delta().insert(
this.value(),
extend(this.formats(), this.attributes.values()),
);
}
format(name, value) {
const attribute = Parchment.query(name, Parchment.Scope.BLOCK_ATTRIBUTE);
if (attribute != null) {
this.attributes.attribute(attribute, value);
}
}
formatAt(index, length, name, value) {
this.format(name, value);
}
insertAt(index, value, def) {
if (typeof value === 'string' && value.endsWith('\n')) {
const block = Parchment.create(Block.blotName);
this.parent.insertBefore(block, index === 0 ? this : this.next);
block.insertAt(0, value.slice(0, -1));
} else {
super.insertAt(index, value, def);
}
}
}
BlockEmbed.scope = Parchment.Scope.BLOCK_BLOT;
// It is important for cursor behavior BlockEmbeds use tags that are block level elements
function bubbleFormats(blot, formats = {}) {
if (blot == null) return formats;
if (typeof blot.formats === 'function') {
formats = extend(formats, blot.formats());
}
if (
blot.parent == null ||
blot.parent.blotName === 'scroll' ||
blot.parent.statics.scope !== blot.statics.scope
) {
return formats;
}
return bubbleFormats(blot.parent, formats);
}
export { bubbleFormats, BlockEmbed, Block as default };