editing deleteSelection.ts

100% Statements 19/19

91.67% Branches 11/12

100% Functions 3/3

100% Lines 19/19

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import { deleteExpandedSelection } from './deleteExpandedSelection';
import { mutateBlock } from '../common/mutate';
import { runEditSteps } from './runEditSteps';
import type {
    DeleteSelectionContext,
    DeleteSelectionResult,
    DeleteSelectionStep,
    FormatContentModelContext,
    ReadonlyContentModelDocument,
} from 'roosterjs-content-model-types';
 
/**
 * Delete selected content from Content Model
 * @param model The model to delete selected content from
 * @param additionalSteps @optional Addition delete steps
 * @param formatContext @optional A context object provided by formatContentModel API
 * @returns A DeleteSelectionResult object to specify the deletion result
 */
export function deleteSelection(
    model: ReadonlyContentModelDocument,
    additionalSteps: (DeleteSelectionStep | null)[] = [],
    formatContext?: FormatContentModelContext
): DeleteSelectionResult {
    const context = deleteExpandedSelection(model, formatContext);
    const steps = additionalSteps.filter(
        (x: DeleteSelectionStep | null): x is DeleteSelectionStep => !!x
    );
 
    runEditSteps(steps, context);
 
    mergeParagraphAfterDelete(context);
    return context;
}
 
// If we end up with multiple paragraphs impacted, we need to merge them
function mergeParagraphAfterDelete(context: DeleteSelectionContext) {
    const {
        insertPoint,
        deleteResult,
        lastParagraph,
        lastTableContext,
        undeletableSegments,
    } = context;
 
    if (
        insertPoint &&
        deleteResult != 'notDeleted' &&
        deleteResult != 'nothingToDelete' &&
        lastParagraph &&
        lastParagraph != insertPoint.paragraph &&
        lastTableContext == insertPoint.tableContext
    ) {
        const mutableLastParagraph = mutateBlock(lastParagraph);
        const mutableInsertingParagraph = mutateBlock(insertPoint.paragraph);
 
        Eif (undeletableSegments) {
            mutableLastParagraph.segments.unshift(...undeletableSegments);
        }
 
        mutableInsertingParagraph.segments.push(...mutableLastParagraph.segments);
        mutableLastParagraph.segments = [];
    }
}