54 lines
1.6 KiB
TypeScript
54 lines
1.6 KiB
TypeScript
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/**
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* Internal dependencies
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*/
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import { isFormatEqual } from './is-format-equal';
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/** @typedef {import('./types').RichTextValue} RichTextValue */
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/**
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* Efficiently updates all the formats from `start` (including) until `end`
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* (excluding) with the active formats. Mutates `value`.
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*
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* @param {Object} $1 Named paramentes.
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* @param {RichTextValue} $1.value Value te update.
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* @param {number} $1.start Index to update from.
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* @param {number} $1.end Index to update until.
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* @param {Array} $1.formats Replacement formats.
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*
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* @return {RichTextValue} Mutated value.
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*/
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export function updateFormats( { value, start, end, formats } ) {
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// Start and end may be switched in case of delete.
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const min = Math.min( start, end );
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const max = Math.max( start, end );
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const formatsBefore = value.formats[ min - 1 ] || [];
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const formatsAfter = value.formats[ max ] || [];
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// First, fix the references. If any format right before or after are
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// equal, the replacement format should use the same reference.
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value.activeFormats = formats.map( ( format, index ) => {
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if ( formatsBefore[ index ] ) {
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if ( isFormatEqual( format, formatsBefore[ index ] ) ) {
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return formatsBefore[ index ];
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}
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} else if ( formatsAfter[ index ] ) {
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if ( isFormatEqual( format, formatsAfter[ index ] ) ) {
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return formatsAfter[ index ];
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}
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}
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return format;
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} );
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while ( --end >= start ) {
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if ( value.activeFormats.length > 0 ) {
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value.formats[ end ] = value.activeFormats;
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} else {
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delete value.formats[ end ];
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}
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}
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return value;
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}
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