@tldraw/state/dist-esm/lib/capture.mjs.map

tldraw infinite canvas SDK (state).

{
  "version": 3,
  "sources": ["../../src/lib/capture.ts"],
  "sourcesContent": ["import { isComputed } from './Computed'\nimport { attach, detach, singleton } from './helpers'\nimport type { Child, Signal } from './types'\n\nclass CaptureStackFrame {\n\toffset = 0\n\n\tmaybeRemoved?: Signal<any>[]\n\n\tconstructor(\n\t\tpublic readonly below: CaptureStackFrame | null,\n\t\tpublic readonly child: Child\n\t) {}\n}\n\nconst inst = singleton('capture', () => ({ stack: null as null | CaptureStackFrame }))\n\n/**\n * Executes the given function without capturing any parents in the current capture context.\n *\n * This is mainly useful if you want to run an effect only when certain signals change while also\n * dereferencing other signals which should not cause the effect to rerun on their own.\n *\n * @example\n * ```ts\n * const name = atom('name', 'Sam')\n * const time = atom('time', () => new Date().getTime())\n *\n * setInterval(() => {\n *   time.set(new Date().getTime())\n * })\n *\n * react('log name changes', () => {\n * \t print(name.get(), 'was changed at', unsafe__withoutCapture(() => time.get()))\n * })\n *\n * ```\n *\n * @public\n */\nexport function unsafe__withoutCapture<T>(fn: () => T): T {\n\tconst oldStack = inst.stack\n\tinst.stack = null\n\ttry {\n\t\treturn fn()\n\t} finally {\n\t\tinst.stack = oldStack\n\t}\n}\n\nexport function startCapturingParents(child: Child) {\n\tinst.stack = new CaptureStackFrame(inst.stack, child)\n\tif (child.__debug_ancestor_epochs__) {\n\t\tconst previousAncestorEpochs = child.__debug_ancestor_epochs__\n\t\tchild.__debug_ancestor_epochs__ = null\n\t\tfor (const p of child.parents) {\n\t\t\tp.__unsafe__getWithoutCapture(true)\n\t\t}\n\t\tlogChangedAncestors(child, previousAncestorEpochs)\n\t}\n\tchild.parentSet.clear()\n}\n\nexport function stopCapturingParents() {\n\tconst frame = inst.stack!\n\tinst.stack = frame.below\n\n\tif (frame.offset < frame.child.parents.length) {\n\t\tfor (let i = frame.offset; i < frame.child.parents.length; i++) {\n\t\t\tconst maybeRemovedParent = frame.child.parents[i]\n\t\t\tif (!frame.child.parentSet.has(maybeRemovedParent)) {\n\t\t\t\tdetach(maybeRemovedParent, frame.child)\n\t\t\t}\n\t\t}\n\n\t\tframe.child.parents.length = frame.offset\n\t\tframe.child.parentEpochs.length = frame.offset\n\t}\n\n\tif (frame.maybeRemoved) {\n\t\tfor (let i = 0; i < frame.maybeRemoved.length; i++) {\n\t\t\tconst maybeRemovedParent = frame.maybeRemoved[i]\n\t\t\tif (!frame.child.parentSet.has(maybeRemovedParent)) {\n\t\t\t\tdetach(maybeRemovedParent, frame.child)\n\t\t\t}\n\t\t}\n\t}\n\n\tif (frame.child.__debug_ancestor_epochs__) {\n\t\tcaptureAncestorEpochs(frame.child, frame.child.__debug_ancestor_epochs__)\n\t}\n}\n\n// this must be called after the parent is up to date\nexport function maybeCaptureParent(p: Signal<any, any>) {\n\tif (inst.stack) {\n\t\tconst wasCapturedAlready = inst.stack.child.parentSet.has(p)\n\t\t// if the child didn't deref this parent last time it executed, then idx will be -1\n\t\t// if the child did deref this parent last time but in a different order relative to other parents, then idx will be greater than stack.offset\n\t\t// if the child did deref this parent last time in the same order, then idx will be the same as stack.offset\n\t\t// if the child did deref this parent already during this capture session then 0 <= idx < stack.offset\n\n\t\tif (wasCapturedAlready) {\n\t\t\treturn\n\t\t}\n\n\t\tinst.stack.child.parentSet.add(p)\n\t\tif (inst.stack.child.isActivelyListening) {\n\t\t\tattach(p, inst.stack.child)\n\t\t}\n\n\t\tif (inst.stack.offset < inst.stack.child.parents.length) {\n\t\t\tconst maybeRemovedParent = inst.stack.child.parents[inst.stack.offset]\n\t\t\tif (maybeRemovedParent !== p) {\n\t\t\t\tif (!inst.stack.maybeRemoved) {\n\t\t\t\t\tinst.stack.maybeRemoved = [maybeRemovedParent]\n\t\t\t\t} else {\n\t\t\t\t\tinst.stack.maybeRemoved.push(maybeRemovedParent)\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tinst.stack.child.parents[inst.stack.offset] = p\n\t\tinst.stack.child.parentEpochs[inst.stack.offset] = p.lastChangedEpoch\n\t\tinst.stack.offset++\n\t}\n}\n\n/**\n * A debugging tool that tells you why a computed signal or effect is running.\n * Call in the body of a computed signal or effect function.\n *\n * @example\n * ```ts\n * const name = atom('name', 'Bob')\n * react('greeting', () => {\n * \twhyAmIRunning()\n *\tprint('Hello', name.get())\n * })\n *\n * name.set('Alice')\n *\n * // 'greeting' is running because:\n * //     'name' changed => 'Alice'\n * ```\n *\n * @public\n */\nexport function whyAmIRunning() {\n\tconst child = inst.stack?.child\n\tif (!child) {\n\t\tthrow new Error('whyAmIRunning() called outside of a reactive context')\n\t}\n\tchild.__debug_ancestor_epochs__ = new Map()\n}\n\nfunction captureAncestorEpochs(child: Child, ancestorEpochs: Map<Signal<any>, number>) {\n\tfor (let i = 0; i < child.parents.length; i++) {\n\t\tconst parent = child.parents[i]\n\t\tconst epoch = child.parentEpochs[i]\n\t\tancestorEpochs.set(parent, epoch)\n\t\tif (isComputed(parent)) {\n\t\t\tcaptureAncestorEpochs(parent as any, ancestorEpochs)\n\t\t}\n\t}\n\treturn ancestorEpochs\n}\n\ntype ChangeTree = { [signalName: string]: ChangeTree } | null\nfunction collectChangedAncestors(\n\tchild: Child,\n\tancestorEpochs: Map<Signal<any>, number>\n): NonNullable<ChangeTree> {\n\tconst changeTree: ChangeTree = {}\n\tfor (let i = 0; i < child.parents.length; i++) {\n\t\tconst parent = child.parents[i]\n\t\tif (!ancestorEpochs.has(parent)) {\n\t\t\tcontinue\n\t\t}\n\t\tconst prevEpoch = ancestorEpochs.get(parent)\n\t\tconst currentEpoch = parent.lastChangedEpoch\n\t\tif (currentEpoch !== prevEpoch) {\n\t\t\tif (isComputed(parent)) {\n\t\t\t\tchangeTree[parent.name] = collectChangedAncestors(parent as any, ancestorEpochs)\n\t\t\t} else {\n\t\t\t\tchangeTree[parent.name] = null\n\t\t\t}\n\t\t}\n\t}\n\treturn changeTree\n}\n\nfunction logChangedAncestors(child: Child, ancestorEpochs: Map<Signal<any>, number>) {\n\tconst changeTree = collectChangedAncestors(child, ancestorEpochs)\n\tif (Object.keys(changeTree).length === 0) {\n\t\t// eslint-disable-next-line no-console\n\t\tconsole.log(`Effect(${child.name}) was executed manually.`)\n\t\treturn\n\t}\n\n\tlet str = isComputed(child)\n\t\t? `Computed(${child.name}) is recomputing because:`\n\t\t: `Effect(${child.name}) is executing because:`\n\n\tfunction logParent(tree: NonNullable<ChangeTree>, indent: number) {\n\t\tconst indentStr = '\\n' + ' '.repeat(indent) + '\u21B3 '\n\t\tfor (const [name, val] of Object.entries(tree)) {\n\t\t\tif (val) {\n\t\t\t\tstr += `${indentStr}Computed(${name}) changed`\n\t\t\t\tlogParent(val, indent + 2)\n\t\t\t} else {\n\t\t\t\tstr += `${indentStr}Atom(${name}) changed`\n\t\t\t}\n\t\t}\n\t}\n\n\tlogParent(changeTree, 1)\n\n\t// eslint-disable-next-line no-console\n\tconsole.log(str)\n}\n"],
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}