@tldraw/editor/dist-esm/lib/editor/managers/Stack.mjs.map

A tiny little drawing app (editor).

{
  "version": 3,
  "sources": ["../../../../src/lib/editor/managers/Stack.ts"],
  "sourcesContent": ["import { EMPTY_ARRAY } from '@tldraw/state'\n\nexport type Stack<T> = StackItem<T> | EmptyStackItem<T>\n\nexport function stack<T>(items?: Array<T>): Stack<T> {\n\tif (items) {\n\t\tlet result = EMPTY_STACK_ITEM as Stack<T>\n\t\twhile (items.length) {\n\t\t\tresult = result.push(items.pop()!)\n\t\t}\n\t\treturn result\n\t}\n\treturn EMPTY_STACK_ITEM as any\n}\n\nclass EmptyStackItem<T> implements Iterable<T> {\n\treadonly length = 0\n\treadonly head = null\n\treadonly tail: Stack<T> = this\n\n\tpush(head: T): Stack<T> {\n\t\treturn new StackItem<T>(head, this)\n\t}\n\n\ttoArray() {\n\t\treturn EMPTY_ARRAY\n\t}\n\n\t[Symbol.iterator]() {\n\t\treturn {\n\t\t\tnext() {\n\t\t\t\treturn { value: undefined, done: true as const }\n\t\t\t},\n\t\t}\n\t}\n}\n\nconst EMPTY_STACK_ITEM = new EmptyStackItem()\n\nclass StackItem<T> implements Iterable<T> {\n\tlength: number\n\tconstructor(\n\t\tpublic readonly head: T,\n\t\tpublic readonly tail: Stack<T>\n\t) {\n\t\tthis.length = tail.length + 1\n\t}\n\n\tpush(head: T): Stack<T> {\n\t\treturn new StackItem(head, this)\n\t}\n\n\ttoArray() {\n\t\treturn Array.from(this)\n\t}\n\n\t[Symbol.iterator]() {\n\t\tlet stack = this as Stack<T>\n\t\treturn {\n\t\t\tnext() {\n\t\t\t\tif (stack.length) {\n\t\t\t\t\tconst value = stack.head!\n\t\t\t\t\tstack = stack.tail\n\t\t\t\t\treturn { value, done: false as const }\n\t\t\t\t} else {\n\t\t\t\t\treturn { value: undefined, done: true as const }\n\t\t\t\t}\n\t\t\t},\n\t\t}\n\t}\n}\n"],
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  "names": ["stack"]
}