46 lines
1.3 KiB
TypeScript
46 lines
1.3 KiB
TypeScript
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interface CursorTargetBlockLike {
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id: string
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content?: unknown
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}
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function blockSupportsTextCursor(block: CursorTargetBlockLike | undefined): block is CursorTargetBlockLike {
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return Array.isArray(block?.content)
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}
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export function findNearestTextCursorBlock(
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blocks: CursorTargetBlockLike[],
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targetIndex: number,
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): CursorTargetBlockLike | null {
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if (blocks.length === 0) return null
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const clampedTargetIndex = Math.min(Math.max(targetIndex, 0), blocks.length - 1)
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const targetBlock = blocks[clampedTargetIndex]
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if (blockSupportsTextCursor(targetBlock)) {
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return targetBlock
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}
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for (let distance = 1; distance < blocks.length; distance += 1) {
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const forwardBlock = blocks[clampedTargetIndex + distance]
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if (blockSupportsTextCursor(forwardBlock)) {
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return forwardBlock
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}
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const backwardBlock = blocks[clampedTargetIndex - distance]
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if (blockSupportsTextCursor(backwardBlock)) {
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return backwardBlock
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}
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}
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return null
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}
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export function findNearestTextCursorBlockById(
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blocks: CursorTargetBlockLike[],
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targetBlockId: string,
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): CursorTargetBlockLike | null {
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const targetIndex = blocks.findIndex((block) => block.id === targetBlockId)
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if (targetIndex === -1) return null
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return findNearestTextCursorBlock(blocks, targetIndex)
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}
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