@tldraw/utils/dist-esm/lib/reordering.mjs.map

tldraw infinite canvas SDK (private utilities).

{
  "version": 3,
  "sources": ["../../src/lib/reordering.ts"],
  "sourcesContent": ["import {\n\tgenerateJitteredKeyBetween,\n\tgenerateNJitteredKeysBetween,\n\tgenerateNKeysBetween,\n} from 'fractional-indexing-jittered'\n\nconst generateKeysFn =\n\tprocess.env.NODE_ENV === 'test' ? generateNKeysBetween : generateNJitteredKeysBetween\n\n/**\n * A string made up of an integer part followed by a fraction part. The fraction point consists of\n * zero or more digits with no trailing zeros. Based on\n * {@link https://observablehq.com/@dgreensp/implementing-fractional-indexing}.\n *\n * @public\n */\nexport type IndexKey = string & { __brand: 'indexKey' }\n\n/**\n * The index key for the first index - 'a0'.\n * @public\n */\nexport const ZERO_INDEX_KEY = 'a0' as IndexKey\n\n/** @internal */\nexport function validateIndexKey(index: string): asserts index is IndexKey {\n\ttry {\n\t\tgenerateJitteredKeyBetween(index, null)\n\t} catch {\n\t\tthrow new Error('invalid index: ' + index)\n\t}\n}\n\n/**\n * Get a number of indices between two indices.\n * @param below - The index below.\n * @param above - The index above.\n * @param n - The number of indices to get.\n * @public\n */\nexport function getIndicesBetween(\n\tbelow: IndexKey | null | undefined,\n\tabove: IndexKey | null | undefined,\n\tn: number\n) {\n\treturn generateKeysFn(below ?? null, above ?? null, n) as IndexKey[]\n}\n\n/**\n * Get a number of indices above an index.\n * @param below - The index below.\n * @param n - The number of indices to get.\n * @public\n */\nexport function getIndicesAbove(below: IndexKey | null | undefined, n: number) {\n\treturn generateKeysFn(below ?? null, null, n) as IndexKey[]\n}\n\n/**\n * Get a number of indices below an index.\n * @param above - The index above.\n * @param n - The number of indices to get.\n * @public\n */\nexport function getIndicesBelow(above: IndexKey | null | undefined, n: number) {\n\treturn generateKeysFn(null, above ?? null, n) as IndexKey[]\n}\n\n/**\n * Get the index between two indices.\n * @param below - The index below.\n * @param above - The index above.\n * @public\n */\nexport function getIndexBetween(\n\tbelow: IndexKey | null | undefined,\n\tabove: IndexKey | null | undefined\n) {\n\treturn generateKeysFn(below ?? null, above ?? null, 1)[0] as IndexKey\n}\n\n/**\n * Get the index above a given index.\n * @param below - The index below.\n * @public\n */\nexport function getIndexAbove(below: IndexKey | null | undefined = null) {\n\treturn generateKeysFn(below, null, 1)[0] as IndexKey\n}\n\n/**\n * Get the index below a given index.\n * @param above - The index above.\n *  @public\n */\nexport function getIndexBelow(above: IndexKey | null | undefined = null) {\n\treturn generateKeysFn(null, above, 1)[0] as IndexKey\n}\n\n/**\n * Get n number of indices, starting at an index.\n * @param n - The number of indices to get.\n * @param start -  The index to start at.\n * @public\n */\nexport function getIndices(n: number, start = 'a1' as IndexKey) {\n\treturn [start, ...generateKeysFn(start, null, n)] as IndexKey[]\n}\n\n/**\n * Sort by index.\n * @param a - An object with an index property.\n * @param b - An object with an index property.\n * @public */\nexport function sortByIndex<T extends { index: IndexKey }>(a: T, b: T) {\n\tif (a.index < b.index) {\n\t\treturn -1\n\t} else if (a.index > b.index) {\n\t\treturn 1\n\t}\n\treturn 0\n}\n"],
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