{"version":3,"file":"set-array.umd.js","sources":["../src/set-array.ts"],"sourcesContent":["type Key = string | number | symbol;\n\n/**\n * SetArray acts like a `Set` (allowing only one occurrence of a string `key`), but provides the\n * index of the `key` in the backing array.\n *\n * This is designed to allow synchronizing a second array with the contents of the backing array,\n * like how in a sourcemap `sourcesContent[i]` is the source content associated with `source[i]`,\n * and there are never duplicates.\n */\nexport class SetArray<T extends Key = Key> {\n  private declare _indexes: Record<T, number | undefined>;\n  declare array: readonly T[];\n\n  constructor() {\n    this._indexes = { __proto__: null } as any;\n    this.array = [];\n  }\n}\n\ninterface PublicSet<T extends Key> {\n  array: T[];\n  _indexes: SetArray<T>['_indexes'];\n}\n\n/**\n * Typescript doesn't allow friend access to private fields, so this just casts the set into a type\n * with public access modifiers.\n */\nfunction cast<T extends Key>(set: SetArray<T>): PublicSet<T> {\n  return set as any;\n}\n\n/**\n * Gets the index associated with `key` in the backing array, if it is already present.\n */\nexport function get<T extends Key>(setarr: SetArray<T>, key: T): number | undefined {\n  return cast(setarr)._indexes[key];\n}\n\n/**\n * Puts `key` into the backing array, if it is not already present. Returns\n * the index of the `key` in the backing array.\n */\nexport function put<T extends Key>(setarr: SetArray<T>, key: T): number {\n  // The key may or may not be present. If it is present, it's a number.\n  const index = get(setarr, key);\n  if (index !== undefined) return index;\n\n  const { array, _indexes: indexes } = cast(setarr);\n\n  const length = array.push(key);\n  return (indexes[key] = length - 1);\n}\n\n/**\n * Pops the last added item out of the SetArray.\n */\nexport function pop<T extends Key>(setarr: SetArray<T>): void {\n  const { array, _indexes: indexes } = cast(setarr);\n  if (array.length === 0) return;\n\n  const last = array.pop()!;\n  indexes[last] = undefined;\n}\n\n/**\n * Removes the key, if it exists in the set.\n */\nexport function remove<T extends Key>(setarr: SetArray<T>, key: T): void {\n  const index = get(setarr, key);\n  if (index === undefined) return;\n\n  const { array, _indexes: indexes } = cast(setarr);\n  for (let i = index + 1; i < array.length; i++) {\n    const k = array[i];\n    array[i - 1] = k;\n    indexes[k]!--;\n  }\n  indexes[key] = undefined;\n  array.pop();\n}\n"],"names":[],"mappings":";;;;;;IAEA;;;;;;;;UAQa,QAAQ;QAInB;YACE,IAAI,CAAC,QAAQ,GAAG,EAAE,SAAS,EAAE,IAAI,EAAS,CAAC;YAC3C,IAAI,CAAC,KAAK,GAAG,EAAE,CAAC;SACjB;KACF;IAOD;;;;IAIA,SAAS,IAAI,CAAgB,GAAgB;QAC3C,OAAO,GAAU,CAAC;IACpB,CAAC;IAED;;;aAGgB,GAAG,CAAgB,MAAmB,EAAE,GAAM;QAC5D,OAAO,IAAI,CAAC,MAAM,CAAC,CAAC,QAAQ,CAAC,GAAG,CAAC,CAAC;IACpC,CAAC;IAED;;;;aAIgB,GAAG,CAAgB,MAAmB,EAAE,GAAM;;QAE5D,MAAM,KAAK,GAAG,GAAG,CAAC,MAAM,EAAE,GAAG,CAAC,CAAC;QAC/B,IAAI,KAAK,KAAK,SAAS;YAAE,OAAO,KAAK,CAAC;QAEtC,MAAM,EAAE,KAAK,EAAE,QAAQ,EAAE,OAAO,EAAE,GAAG,IAAI,CAAC,MAAM,CAAC,CAAC;QAElD,MAAM,MAAM,GAAG,KAAK,CAAC,IAAI,CAAC,GAAG,CAAC,CAAC;QAC/B,QAAQ,OAAO,CAAC,GAAG,CAAC,GAAG,MAAM,GAAG,CAAC,EAAE;IACrC,CAAC;IAED;;;aAGgB,GAAG,CAAgB,MAAmB;QACpD,MAAM,EAAE,KAAK,EAAE,QAAQ,EAAE,OAAO,EAAE,GAAG,IAAI,CAAC,MAAM,CAAC,CAAC;QAClD,IAAI,KAAK,CAAC,MAAM,KAAK,CAAC;YAAE,OAAO;QAE/B,MAAM,IAAI,GAAG,KAAK,CAAC,GAAG,EAAG,CAAC;QAC1B,OAAO,CAAC,IAAI,CAAC,GAAG,SAAS,CAAC;IAC5B,CAAC;IAED;;;aAGgB,MAAM,CAAgB,MAAmB,EAAE,GAAM;QAC/D,MAAM,KAAK,GAAG,GAAG,CAAC,MAAM,EAAE,GAAG,CAAC,CAAC;QAC/B,IAAI,KAAK,KAAK,SAAS;YAAE,OAAO;QAEhC,MAAM,EAAE,KAAK,EAAE,QAAQ,EAAE,OAAO,EAAE,GAAG,IAAI,CAAC,MAAM,CAAC,CAAC;QAClD,KAAK,IAAI,CAAC,GAAG,KAAK,GAAG,CAAC,EAAE,CAAC,GAAG,KAAK,CAAC,MAAM,EAAE,CAAC,EAAE,EAAE;YAC7C,MAAM,CAAC,GAAG,KAAK,CAAC,CAAC,CAAC,CAAC;YACnB,KAAK,CAAC,CAAC,GAAG,CAAC,CAAC,GAAG,CAAC,CAAC;YACjB,OAAO,CAAC,CAAC,CAAE,EAAE,CAAC;SACf;QACD,OAAO,CAAC,GAAG,CAAC,GAAG,SAAS,CAAC;QACzB,KAAK,CAAC,GAAG,EAAE,CAAC;IACd;;;;;;;;;;;;;;"}