59 lines
1.2 KiB
TypeScript
59 lines
1.2 KiB
TypeScript
import { RichTextFormat } from './types';
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/**
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* Optimised equality check for format objects.
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*
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* @param {?RichTextFormat} format1 Format to compare.
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* @param {?RichTextFormat} format2 Format to compare.
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*
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* @return {boolean} True if formats are equal, false if not.
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*/
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export function isFormatEqual( format1: RichTextFormat, format2: RichTextFormat ): boolean {
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// Both not defined.
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if ( format1 === format2 ) {
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return true;
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}
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// Either not defined.
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if ( ! format1 || ! format2 ) {
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return false;
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}
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if ( format1.type !== format2.type ) {
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return false;
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}
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const attributes1 = format1.attributes;
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const attributes2 = format2.attributes;
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// Both not defined.
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if ( attributes1 === attributes2 ) {
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return true;
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}
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// Either not defined.
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if ( ! attributes1 || ! attributes2 ) {
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return false;
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}
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const keys1 = Object.keys( attributes1 );
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const keys2 = Object.keys( attributes2 );
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if ( keys1.length !== keys2.length ) {
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return false;
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}
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const length = keys1.length;
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// Optimise for speed.
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for ( let i = 0; i < length; i++ ) {
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const name = keys1[ i ];
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if ( attributes1[ name ] !== attributes2[ name ] ) {
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return false;
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}
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}
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return true;
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}
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