Merge pull request #198 from Tencent/refactor/document-capture-facts

refactor(observation): decouple DOM processing from capture orchestration | 解耦 DOM 处理与采集流程
This commit is contained in:
Hannah Liu
2026-09-09 16:24:42 +08:00
committed by GitHub
18 changed files with 1050 additions and 612 deletions
@@ -672,6 +672,60 @@ describe("buildVomScene", () => {
expect(nestedInput?.parentId).toBe(result.nodes.find((item) => item.backendNodeId === 210)?.id);
});
it("excludes an overlay only in its owning document when target backend ids collide", () => {
const owner = (id: number): CapturedNode => ({
backendNodeId: id,
parentBackendNodeId: null,
frameId: "main",
tag: "iframe",
attrs: {},
rect: { x: id * 10, y: 0, w: 200, h: 100 },
paintOrder: 0,
position: "static",
pointerEvents: "auto",
});
const owners = [owner(10), owner(20)];
const result = buildFrameVomScene(
[
{
frameId: "main",
contextScopeId: "main",
target: { tabId: 7 },
domNodes: owners,
axNodes: [],
},
...["left", "right"].map((frameId, i) => ({
frameId,
contextScopeId: frameId,
parentFrameId: "main",
ownerBackendNodeId: owners[i].backendNodeId,
target: { tabId: 7, sessionId: frameId },
excludedBackendNodeIds: new Set(i === 0 ? [7] : []),
domNodes: [],
axNodes: [
{
nodeId: "button",
frameId,
backendDOMNodeId: 7,
role: { type: "role", value: "button" },
name: { type: "computedString", value: frameId + " action" },
},
],
})),
],
{
nodes: owners,
viewport: { width: 800, height: 600 },
iframeNodes: new Map(),
excludedBackendNodeIds: new Set(),
},
);
const rendered = renderVom(result);
expect(rendered.text).not.toContain("left action");
expect(rendered.text).toContain("right action");
expect(rendered.refs.find((ref) => ref.backendNodeId === 7)?.frameId).toBe("right");
});
it("does not place a child document at the page root when its frame boundary is unresolved", () => {
const childNode: CapturedNode = {
backendNodeId: 101,
+2
View File
@@ -676,6 +676,7 @@ function legacyFrameDocuments(
...(pageUrl ? { url: pageUrl } : {}),
axNodes: [],
domNodes: captured.nodes.map((node) => ({ ...node, frameId: node.frameId ?? rootFrameId })),
excludedBackendNodeIds: captured.frameExcludedBackendNodeIds?.get(rootFrameId),
},
];
const pending = [...captured.iframeNodes.entries()];
@@ -699,6 +700,7 @@ function legacyFrameDocuments(
target: parent.target,
axNodes: [],
domNodes: domNodes.map((node) => ({ ...node, frameId: node.frameId ?? frameId })),
excludedBackendNodeIds: captured.frameExcludedBackendNodeIds?.get(frameId),
});
pending.splice(index, 1);
progress = true;
@@ -538,6 +538,9 @@ describe("captureViewModel", () => {
strings: S,
documents: [
{
scrollOffsetX: 0,
scrollOffsetY: 0,
frameId: "main",
nodes: {
parentIndex: [-1, 0, 1, 0, 3, 4],
nodeName: [i("html"), i("body"), i("div"), i(OVERLAY_HOST_NAME), i("div"), i("button")],
@@ -568,8 +571,12 @@ describe("captureViewModel", () => {
],
};
const { excludedBackendNodeIds } = await captureViewModel(makeCdp(snapshot), 4);
const { excludedBackendNodeIds, frameExcludedBackendNodeIds } = await captureViewModel(
makeCdp(snapshot),
4,
);
expect(excludedBackendNodeIds).toEqual(new Set([13, 14, 15]));
expect(frameExcludedBackendNodeIds?.get("main")).toEqual(excludedBackendNodeIds);
});
it("excludes overlay host matched by tag name only", async () => {
@@ -1168,6 +1175,8 @@ describe("captureViewModel", () => {
},
},
{
scrollOffsetX: 0,
scrollOffsetY: 0,
nodes: {
parentIndex: [-1, 0, 1],
nodeName: [i("html"), i("body"), i("iframe")],
@@ -1175,8 +1184,6 @@ describe("captureViewModel", () => {
attributes: [[], [], []],
contentDocumentIndex: { index: [2], value: [2] },
},
scrollOffsetX: 0,
scrollOffsetY: 0,
layout: {
nodeIndex: [1, 2],
styles: [
@@ -1191,14 +1198,14 @@ describe("captureViewModel", () => {
},
},
{
scrollOffsetX: 0,
scrollOffsetY: 0,
nodes: {
parentIndex: [-1, 0],
nodeName: [i("body"), i("input")],
backendNodeId: [30, 31],
attributes: [[], [i("type"), i("text")]],
},
scrollOffsetX: 0,
scrollOffsetY: 0,
layout: {
nodeIndex: [1],
styles: [[i("static"), i("auto")]],
@@ -0,0 +1,127 @@
import { describe, expect, it, vi } from "vitest";
import { OVERLAY_HOST_MARKER_ATTR } from "@/lib/overlay-bridge";
import { createCaptureCheckpoint } from "../capture-abort";
import { buildDocumentIndex, type DecodedNode } from "../facts";
import { decodeDocument, REQUESTED_STYLES } from "../snapshot";
function node(id: number, parent: number | null): DecodedNode {
return {
backendNodeId: id,
parentBackendNodeId: parent,
tag: "div",
attrs: {},
paintOrder: 0,
position: "static",
pointerEvents: "auto",
};
}
describe("document facts", () => {
it.each([
1_000, 10_000, 100_000,
])("indexes deep and wide inputs of %i without copying ancestors", async (count) => {
for (const wide of [false, true]) {
let reads = 0;
const input = Array.from({ length: count }, (_, i) => {
const item = node(i, i ? (wide ? 0 : i - 1) : null);
if (i === 0) item.attrs[OVERLAY_HOST_MARKER_ATTR] = "";
Object.defineProperty(item, "parentBackendNodeId", {
get: () => {
reads++;
return i ? (wide ? 0 : i - 1) : null;
},
});
return item;
}).reverse(); // parent need not precede child
const index = await buildDocumentIndex(input);
expect(index.nodes.size).toBe(count);
expect(index.excludedBackendNodeIds.size).toBe(count);
expect(reads).toBeLessThanOrEqual(count * 8);
expect(index.nodes.get(count - 1)).toBe(input[0]);
}
});
it("handles cycles and orphans and propagates overlay through shadow roots", async () => {
const host = { ...node(1, null), attrs: { [OVERLAY_HOST_MARKER_ATTR]: "" } };
const input = [
node(3, 2),
{ ...node(2, 1), tag: "#document-fragment" },
host,
node(4, 99),
node(5, 6),
node(6, 5),
node(7, 6),
];
const index = await buildDocumentIndex(input);
expect([...index.excludedBackendNodeIds].sort()).toEqual([1, 2, 3]);
expect(index.nodes.size).toBe(input.length);
});
it("does not propagate a descendant overlay backwards into a cycle", async () => {
const overlay = { ...node(3, 1), attrs: { [OVERLAY_HOST_MARKER_ATTR]: "" } };
const index = await buildDocumentIndex([overlay, node(1, 2), node(2, 1)]);
expect([...index.excludedBackendNodeIds]).toEqual([3]);
});
it("decodes current observation bounds, styles and attributes without projecting coordinates", async () => {
const strings = ["div", "aria-hidden", "true", "inert", "", "visible", "0", "static", "auto"];
const styles = REQUESTED_STYLES.map((style) =>
style === "visibility" ? 5 : style === "opacity" ? 6 : style === "position" ? 7 : 8,
);
const { nodes } = await decodeDocument(
{
nodes: { backendNodeId: [1], parentIndex: [-1], nodeName: [0], attributes: [[1, 2, 3, 4]] },
layout: { nodeIndex: [0], bounds: [[10, 20, 120, 40]], styles: [styles] },
},
strings,
);
expect(nodes[0].attrs).toEqual({ "aria-hidden": "true", inert: "" });
expect(nodes[0].layout).toEqual({
boundsSpace: "snapshot-document-layout",
bounds: [10, 20, 120, 40],
styles: {
position: "static",
"pointer-events": "auto",
cursor: "auto",
visibility: "visible",
opacity: "0",
},
});
expect(nodes[0]).not.toHaveProperty("rect");
expect(nodes[0]).not.toHaveProperty("excluded");
});
it("keeps short blocks synchronous and checks cancellation after yielding", async () => {
const clock = vi.spyOn(performance, "now").mockReturnValue(0);
try {
const controller = new AbortController();
const checkpoint = createCaptureCheckpoint(controller.signal);
for (let i = 0; i < 20; i++) expect(checkpoint()).toBeUndefined();
clock.mockReturnValue(9);
const pending = checkpoint();
expect(pending).toBeInstanceOf(Promise);
controller.abort();
await expect(pending).rejects.toMatchObject({ name: "AbortError" });
} finally {
clock.mockRestore();
}
});
it("checks cancellation at bounded indexing blocks", async () => {
const controller = new AbortController();
const input = Array.from({ length: 100_000 }, (_, i) => node(i, i ? i - 1 : null));
let reads = 0;
for (const item of input)
Object.defineProperty(item, "attrs", {
get: () => {
reads++;
if (reads === 100) controller.abort();
return {};
},
});
await expect(buildDocumentIndex(input, controller.signal)).rejects.toMatchObject({
name: "AbortError",
});
expect(reads).toBeLessThanOrEqual(356);
});
});
@@ -1,6 +1,7 @@
import { describe, expect, it, vi } from "vitest";
import { type CdpRunner, cdpRunnerForTarget } from "../../shared";
import { captureViewModel } from "../capture";
import { enrichFormControlStates } from "../form-capture";
import { decodeDocument } from "../snapshot";
interface Control {
id: number;
@@ -77,21 +78,32 @@ function reply(entries: Array<[number, unknown]>) {
};
}
function fakeCdp(groups: Control[][], evaluate: (params: Record<string, unknown>) => unknown) {
async function fakeCdp(
groups: Control[][],
evaluate: (params: Record<string, unknown>) => unknown,
) {
const snap = snapshot(groups);
const send = vi.fn(async (_tabId: number, method: string, params?: object) => {
if (method === "DOMSnapshot.captureSnapshot") return snap;
if (method === "Runtime.evaluate") return evaluate(params as Record<string, unknown>);
return {};
});
return { send, cdp: { send: send as CdpRunner["send"] } };
const nodes = await decodeControls(snap);
return { send, cdp: { send: send as CdpRunner["send"] }, nodes };
}
async function decodeControls(snap: ReturnType<typeof snapshot>) {
return Promise.all(
snap.documents.map(async (doc) =>
(await decodeDocument(doc, snap.strings)).nodes.map((node) => ({ ...node, rect: null })),
),
);
}
describe("form state identity", () => {
it("matches reordered controls by identity and preserves controls missing from the batch", async () => {
// The snapshot includes a shadow input. The runtime query skips it,
// encounters a new input, and sees the remaining inputs in a new order.
const { cdp } = fakeCdp(
const { cdp, nodes } = await fakeCdp(
[
[
{ id: 10, value: "" },
@@ -106,21 +118,21 @@ describe("form state identity", () => {
[11, state("alice@example.com")],
]),
);
const captured = await captureViewModel(cdp, 7);
expect(captured.nodes.find((n) => n.backendNodeId === 10)).toMatchObject({
await enrichFormControlStates(cdp, 7, nodes);
expect(nodes[0].find((n) => n.backendNodeId === 10)).toMatchObject({
formValue: "",
formState: "empty",
formPlaceholder: "snapshot placeholder",
});
expect(captured.nodes.find((n) => n.backendNodeId === 11)).toMatchObject({
expect(nodes[0].find((n) => n.backendNodeId === 11)).toMatchObject({
formValue: "alice@example.com",
});
expect(captured.nodes.find((n) => n.backendNodeId === 12)).toMatchObject({ formValue: "上海" });
expect(captured.nodes.some((n) => n.backendNodeId === 99)).toBe(false);
expect(nodes[0].find((n) => n.backendNodeId === 12)).toMatchObject({ formValue: "上海" });
expect(nodes[0].some((n) => n.backendNodeId === 99)).toBe(false);
});
it("does not shift state between frames when one frame is absent from the runtime batch", async () => {
const { cdp } = fakeCdp(
const { cdp, nodes } = await fakeCdp(
[
[],
[{ id: 11, value: "inaccessible frame" }],
@@ -133,8 +145,8 @@ describe("form state identity", () => {
[21, state("second frame")],
]),
);
const captured = await captureViewModel(cdp, 7);
const controls = [...captured.iframeNodes.values()].flat();
await enrichFormControlStates(cdp, 7, nodes);
const controls = nodes.slice(1).flat();
expect(controls.find((n) => n.backendNodeId === 11)?.formValue).toBe("inaccessible frame");
expect(controls.find((n) => n.backendNodeId === 21)?.formValue).toBe("second frame");
expect(controls.find((n) => n.backendNodeId === 31)?.formValue).toBe("third frame");
@@ -142,7 +154,6 @@ describe("form state identity", () => {
it("keeps identical backend ids in different OOPIF targets separate", async () => {
const sendToTarget = vi.fn(async (target, method) => {
if (method === "DOMSnapshot.captureSnapshot") return snapshot([[{ id: 11, value: "old" }]]);
if (method === "Runtime.evaluate") return reply([[11, state(target.sessionId)]]);
return {};
});
@@ -151,8 +162,9 @@ describe("form state identity", () => {
});
const cdp = { send, sendToTarget } as unknown as CdpRunner;
for (const sessionId of ["left-frame", "right-frame"]) {
const captured = await captureViewModel(cdpRunnerForTarget(cdp, { tabId: 7, sessionId }), 7);
expect(captured.nodes.find((n) => n.backendNodeId === 11)?.formValue).toBe(sessionId);
const nodes = await decodeControls(snapshot([[{ id: 11, value: "old" }]]));
await enrichFormControlStates(cdpRunnerForTarget(cdp, { tabId: 7, sessionId }), 7, nodes);
expect(nodes[0].find((n) => n.backendNodeId === 11)?.formValue).toBe(sessionId);
expect(sendToTarget).toHaveBeenCalledWith(
{ tabId: 7, sessionId },
"Runtime.releaseObjectGroup",
@@ -168,7 +180,7 @@ describe("form state identity", () => {
"malformed",
"invalid-state",
])("preserves snapshot data when enrichment is %s", async (mode) => {
const { cdp, send } = fakeCdp([[{ id: 11, value: "snapshot value" }]], () => {
const { cdp, send, nodes } = await fakeCdp([[{ id: 11, value: "snapshot value" }]], () => {
if (mode === "unsupported") throw new Error("serialization unsupported");
if (mode === "legacy") return { result: { value: { controls: [state("wrong value")] } } };
const result = reply([
@@ -178,8 +190,8 @@ describe("form state identity", () => {
result.result.deepSerializedValue.value[0].value[1].value = "not json";
return result;
});
const captured = await captureViewModel(cdp, 7);
expect(captured.nodes.find((n) => n.backendNodeId === 11)).toMatchObject({
expect(await enrichFormControlStates(cdp, 7, nodes)).toBe(mode !== "unsupported");
expect(nodes[0].find((n) => n.backendNodeId === 11)).toMatchObject({
formValue: "snapshot value",
formPlaceholder: "snapshot placeholder",
});
@@ -188,18 +200,34 @@ describe("form state identity", () => {
it("releases the batch's remote objects when capture is cancelled", async () => {
const controller = new AbortController();
const { cdp, send } = fakeCdp([[{ id: 11, value: "old" }]], () => {
const { cdp, send, nodes } = await fakeCdp([[{ id: 11, value: "old" }]], () => {
controller.abort();
return reply([[11, state("new")]]);
});
await expect(captureViewModel(cdp, 7, { signal: controller.signal })).rejects.toMatchObject({
await expect(enrichFormControlStates(cdp, 7, nodes, controller.signal)).rejects.toMatchObject({
name: "AbortError",
});
expect(send).toHaveBeenCalledWith(7, "Runtime.releaseObjectGroup", expect.anything());
});
it("does not report success when cancelled during object cleanup", async () => {
const controller = new AbortController();
const nodes = await decodeControls(snapshot([[{ id: 11, value: "old" }]]));
const cdp: CdpRunner = {
send: vi.fn(async (_tabId, method) => {
if (method === "Runtime.evaluate") return reply([[11, state("new")]]);
if (method === "Runtime.releaseObjectGroup") controller.abort();
return {};
}) as CdpRunner["send"],
};
await expect(enrichFormControlStates(cdp, 7, nodes, controller.signal)).rejects.toMatchObject({
name: "AbortError",
});
expect(cdp.send).toHaveBeenCalledWith(7, "Runtime.releaseObjectGroup", expect.anything());
});
it("skips entries without node identity while still applying valid entries", async () => {
const { cdp } = fakeCdp(
const { cdp, nodes } = await fakeCdp(
[
[
{ id: 11, value: "snapshot value" },
@@ -216,20 +244,20 @@ describe("form state identity", () => {
return result;
},
);
const captured = await captureViewModel(cdp, 7);
expect(captured.nodes.find((n) => n.backendNodeId === 11)?.formValue).toBe("snapshot value");
expect(captured.nodes.find((n) => n.backendNodeId === 12)?.formValue).toBe("live value");
await enrichFormControlStates(cdp, 7, nodes);
expect(nodes[0].find((n) => n.backendNodeId === 11)?.formValue).toBe("snapshot value");
expect(nodes[0].find((n) => n.backendNodeId === 12)?.formValue).toBe("live value");
});
it.each([
"password",
"text",
])("redacts a sensitive %s control after identity matching", async (type) => {
const { cdp } = fakeCdp([[{ id: 11, value: "secret", type }]], () =>
const { cdp, nodes } = await fakeCdp([[{ id: 11, value: "secret", type }]], () =>
reply([[11, { ...state("secret"), sensitive: true }]]),
);
const captured = await captureViewModel(cdp, 7);
const control = captured.nodes.find((n) => n.backendNodeId === 11);
await enrichFormControlStates(cdp, 7, nodes);
const control = nodes[0].find((n) => n.backendNodeId === 11);
expect(control?.formState).toBe("filled");
expect(control?.formValue).toBeUndefined();
expect(control?.formDefaultValue).toBeUndefined();
@@ -246,7 +274,7 @@ describe("form state identity", () => {
defaultValue: "",
placeholder: "",
}));
const { cdp, send } = fakeCdp([controls], (params) => {
const { cdp, send, nodes } = await fakeCdp([controls], (params) => {
const doc = {
querySelectorAll: (selector: string) =>
selector === "input,textarea,select" ? elements : [],
@@ -257,9 +285,9 @@ describe("form state identity", () => {
expect(entries).toHaveLength(250);
return reply(entries.map(([element, json]) => [element.backendNodeId, JSON.parse(json)]));
});
const captured = await captureViewModel(cdp, 7);
expect(captured.nodes.find((n) => n.backendNodeId === 250)?.formValue).toBe("live 250");
expect(captured.nodes.find((n) => n.backendNodeId === 251)?.formValue).toBe("old");
await enrichFormControlStates(cdp, 7, nodes);
expect(nodes[0].find((n) => n.backendNodeId === 250)?.formValue).toBe("live 250");
expect(nodes[0].find((n) => n.backendNodeId === 251)?.formValue).toBe("old");
expect(send.mock.calls.filter(([, method]) => method === "Runtime.evaluate")).toHaveLength(1);
expect(
send.mock.calls.filter(([, method]) => method === "Runtime.releaseObjectGroup"),
@@ -1,4 +1,5 @@
import { describe, expect, it, vi } from "vitest";
import { OVERLAY_HOST_MARKER_ATTR } from "@/lib/overlay-bridge";
import type { CdpRunner } from "../../shared";
import type { CapturedNode, CapturedViewModel } from "../capture";
import { captureFrameData } from "../frame-capture";
@@ -32,7 +33,7 @@ function childSnapshot(frameId: string, backendNodeId: number) {
parentIndex: [-1, 0],
nodeName: [1, 2],
backendNodeId: [backendNodeId - 1, backendNodeId],
attributes: [[], []],
attributes: [[], []] as number[][],
},
layout: {
nodeIndex: [0, 1],
@@ -140,9 +141,15 @@ describe("captureFrameData", () => {
}
if (method === "DOMSnapshot.enable" || method === "Accessibility.enable") return {};
if (method === "DOMSnapshot.captureSnapshot") {
return target.sessionId === "left-session"
? childSnapshot("left", 101)
: childSnapshot("right", 201);
if (target.sessionId !== "left-session") return childSnapshot("right", 201);
const snapshot = childSnapshot("left", 101);
const marker = snapshot.strings.push(OVERLAY_HOST_MARKER_ATTR) - 1;
const nodes = snapshot.documents[0].nodes;
nodes.backendNodeId.push(201); // Same id as a real button in the other target.
nodes.parentIndex.push(0);
nodes.nodeName.push(2);
nodes.attributes.push([marker, -1]);
return snapshot;
}
if (method === "Accessibility.getFullAXTree") return { nodes: [] };
throw new Error(`unexpected ${method}`);
@@ -188,6 +195,10 @@ describe("captureFrameData", () => {
const trees = await captureFrameData(cdp, 4, captured);
expect(trees.find((tree) => tree.frameId === "left")?.excludedBackendNodeIds).toEqual(
new Set([201]),
);
expect(trees.find((tree) => tree.frameId === "right")?.excludedBackendNodeIds?.size).toBe(0);
expect(trees.map((tree) => tree.frameId)).toEqual(["main", "left", "right"]);
expect(
captured.frameNodes?.get("left")?.find((node) => node.backendNodeId === 101)?.rect,
@@ -274,10 +285,5 @@ describe("captureFrameData", () => {
expect(childDocument?.domNodes.find((node) => node.backendNodeId === 101)).toEqual(
expect.objectContaining({ rect: null, localRect: null, rendered: true }),
);
expect(captured.frameGeometryIssues).toContainEqual({
status: "unavailable",
source: { target: { tabId: 4, sessionId: "child-session" }, frameId: "child" },
reason: "snapshot-coordinates-unavailable",
});
});
});
@@ -29,7 +29,7 @@ function captured(frameNodes: Map<string, CapturedNode[]>): CapturedViewModel {
}
describe("buildFrameDocuments", () => {
it("partitions mixed AX results by node ownership and cuts cross-frame parent edges", () => {
it("partitions mixed AX results by node ownership and cuts cross-frame parent edges", async () => {
const graph: CdpFrameGraph = {
rootFrameId: "main",
frames: [
@@ -54,7 +54,7 @@ describe("buildFrameDocuments", () => {
},
];
const documents = buildFrameDocuments(
const documents = await buildFrameDocuments(
graph,
batches,
captured(
@@ -72,7 +72,7 @@ describe("buildFrameDocuments", () => {
expect(childNodes.find((node) => node.nodeId === "virtual")?.frameId).toBe("child");
});
it("deduplicates overlapping same-target AX results using the strongest ownership", () => {
it("deduplicates overlapping same-target AX results using the strongest ownership", async () => {
const graph: CdpFrameGraph = {
rootFrameId: "main",
frames: [
@@ -92,7 +92,7 @@ describe("buildFrameDocuments", () => {
},
];
const documents = buildFrameDocuments(
const documents = await buildFrameDocuments(
graph,
batches,
captured(
@@ -107,7 +107,7 @@ describe("buildFrameDocuments", () => {
expect(documents.find((document) => document.frameId === "child")?.axNodes).toHaveLength(1);
});
it("uses target-scoped backend ownership when OOPIF backend ids collide", () => {
it("uses target-scoped backend ownership when OOPIF backend ids collide", async () => {
const graph: CdpFrameGraph = {
rootFrameId: "main",
frames: [
@@ -129,7 +129,7 @@ describe("buildFrameDocuments", () => {
nodes: [{ nodeId: `${frame.frameId}-node`, backendDOMNodeId: 7 }],
}));
const documents = buildFrameDocuments(
const documents = await buildFrameDocuments(
graph,
batches,
captured(
@@ -149,7 +149,7 @@ describe("buildFrameDocuments", () => {
);
});
it("uses captured frame parent identity instead of guessing from backend ids", () => {
it("uses captured frame parent identity instead of guessing from backend ids", async () => {
const frameNodes = new Map([
["main", [domNode("main", 1)]],
["left", [domNode("left", 7)]],
@@ -164,11 +164,25 @@ describe("buildFrameDocuments", () => {
nodes: [],
}));
const documents = buildFrameDocuments(null, frames, capture);
const documents = await buildFrameDocuments(null, frames, capture);
expect(documents.find((document) => document.frameId === "child")).toMatchObject({
parentFrameId: "left",
ownerBackendNodeId: 7,
});
});
it("resolves a reverse-ordered deep AX parent chain without recursion", async () => {
const frame = { frameId: "main", target: { tabId: 4 } };
const nodes: FrameOwnedAxNode[] = Array.from({ length: 10000 }, (_, i) => ({
nodeId: String(i),
...(i ? { parentId: String(i - 1) } : { frameId: "main" }),
})).reverse();
const documents = await buildFrameDocuments(
{ rootFrameId: "main", frames: [frame] },
[{ frame, nodes }],
captured(new Map()),
);
expect(documents[0].axNodes).toHaveLength(10000);
expect(documents[0].axNodes[0].frameId).toBe("main");
});
});
@@ -0,0 +1,40 @@
function captureAbortError(): Error {
const error = new Error("observation aborted");
error.name = "AbortError";
return error;
}
export function isAbortError(error: unknown): boolean {
return (
typeof error === "object" &&
error !== null &&
(error as { name?: string }).name === "AbortError"
);
}
export function throwIfAborted(signal: AbortSignal | undefined): void {
if (signal?.aborted) throw captureAbortError();
}
/** Check at bounded work blocks; yield only after a processing slice is spent.
* Each caller owns its deadline, so unrelated captures do not share state. */
export function createCaptureCheckpoint(signal?: AbortSignal): () => Promise<void> | undefined {
throwIfAborted(signal);
let deadline = performance.now() + 8;
return () => {
throwIfAborted(signal);
if (performance.now() < deadline) return;
return new Promise<void>((resolve) => {
const channel = new MessageChannel();
channel.port1.onmessage = () => {
channel.port1.close();
channel.port2.close();
resolve();
};
channel.port2.postMessage(null);
}).then(() => {
throwIfAborted(signal);
deadline = performance.now() + 8;
});
};
}
@@ -0,0 +1,37 @@
import type { Rect } from "@browser-skill/vom";
export interface CapturedNode {
backendNodeId: number;
parentBackendNodeId: number | null;
frameId?: string;
/** Owning iframe backend node id; `null` for the top-level document. */
ownerFrameBackendNodeId?: number | null;
tag: string;
attrs: Record<string, string>;
/** Top-level viewport-relative CSS px, clipped to the owning frame viewport. */
rect: Rect | null;
/** Frame-local viewport-relative CSS px before top-level projection. */
localRect?: Rect | null;
paintOrder: number;
position: string;
pointerEvents: string;
/**
* computed `cursor`. `cursor: pointer` is the strongest CDP-free signal
* that a non-semantic element (a `<div>`/`<span>` with a click handler)
* is actually an interactive control — used by the adapter to surface
* custom buttons/checkboxes the AX tree drops as `generic`. Optional like
* `textContent`: the live parser always sets it, hand-built fixtures may not.
*/
cursor?: string;
/**
* Whether the live DOM snapshot provides a painted, non-hidden box for this
* node. Semantic resolution uses this only for DOM fallback nodes; AX-backed
* nodes remain authoritative even when they are outside the viewport.
*/
rendered?: boolean;
textContent?: string;
formState?: "empty" | "filled" | "default";
formValue?: string;
formDefaultValue?: string;
formPlaceholder?: string;
}
+34 -506
View File
@@ -1,20 +1,14 @@
// CDP capture adapter: DOMSnapshot.captureSnapshot + Page.getLayoutMetrics
// → CapturedNode[] + Viewport. This is the ONLY VOM module that touches
// raw CDP. The captureSnapshot reply is columnar (parallel arrays + a
// shared string table); requested computed styles are decoded through
// STYLE_COL so capture and visibility policy share one explicit contract.
// Coordinate DOMSnapshot acquisition, frame geometry and hover probes.
// Snapshot decoding and form enrichment live in their own modules.
import type { Rect, Viewport } from "@browser-skill/vom";
import type { Viewport } from "@browser-skill/vom";
import type { CdpTarget } from "@/browser-driver/frame-graph";
import { evaluateHoverTrigger } from "@/lib/hover-trigger-policy";
import { isOverlayHostNode, OVERLAY_HOST_SELECTOR } from "../../lib/overlay-bridge";
import { OVERLAY_HOST_SELECTOR } from "../../lib/overlay-bridge";
import {
type FrameProjectionIssue,
type FrameProjectionState,
projectSnapshotRect,
type SnapshotCoordinates,
snapshotCoordinates,
snapshotViewportRect,
} from "../geometry/coordinate-types";
import {
GeometryContext,
@@ -22,48 +16,20 @@ import {
snapshotLayoutScale,
} from "../geometry/frame-context";
import type { CdpRunner } from "../shared";
import { isAbortError, throwIfAborted } from "./capture-abort";
import type { CapturedNode } from "./capture-types";
import { enrichFormControlStates } from "./form-capture";
import { clearHover, ProbeBudget, waitForHover } from "./hover-perception";
import { type FrameContext, normalizeDocument } from "./normalize";
import {
REQUESTED_STYLES,
type SnapshotDocument,
type SnapshotReply,
snapshotFrameId,
sparseIndexMap,
} from "./snapshot";
const REQUESTED_STYLES = ["position", "pointer-events", "cursor", "visibility", "opacity"] as const;
const STYLE_COL = Object.fromEntries(
REQUESTED_STYLES.map((name, index) => [name, index]),
) as Record<(typeof REQUESTED_STYLES)[number], number>;
export interface CapturedNode {
backendNodeId: number;
parentBackendNodeId: number | null;
frameId?: string;
/** Owning iframe backend node id; `null` for the top-level document. */
ownerFrameBackendNodeId?: number | null;
tag: string;
attrs: Record<string, string>;
/** Top-level viewport-relative CSS px, clipped to the owning frame viewport. */
rect: Rect | null;
/** Frame-local viewport-relative CSS px before top-level projection. */
localRect?: Rect | null;
paintOrder: number;
position: string;
pointerEvents: string;
/**
* computed `cursor`. `cursor: pointer` is the strongest CDP-free signal
* that a non-semantic element (a `<div>`/`<span>` with a click handler)
* is actually an interactive control — used by the adapter to surface
* custom buttons/checkboxes the AX tree drops as `generic`. Optional like
* `textContent`: the live parser always sets it, hand-built fixtures may not.
*/
cursor?: string;
/**
* Whether the live DOM snapshot provides a painted, non-hidden box for this
* node. Semantic resolution uses this only for DOM fallback nodes; AX-backed
* nodes remain authoritative even when they are outside the viewport.
*/
rendered?: boolean;
textContent?: string;
formState?: "empty" | "filled" | "default";
formValue?: string;
formDefaultValue?: string;
formPlaceholder?: string;
}
export type { CapturedNode } from "./capture-types";
export type CapturedIframeNodes = Map<number, CapturedNode[]>;
@@ -80,6 +46,7 @@ export interface CapturedViewModel {
viewport: Viewport;
iframeNodes: CapturedIframeNodes;
frameNodes?: Map<string, CapturedNode[]>;
frameExcludedBackendNodeIds?: Map<string, ReadonlySet<number>>;
frameOwnerBackendNodeIds?: Map<string, number>;
/** Explicit DOMSnapshot frame ancestry; never inferred from backend node ids. */
frameParentIds?: Map<string, string>;
@@ -96,244 +63,9 @@ export interface CaptureViewModelOptions {
target?: CdpTarget;
}
function captureAbortError(): Error {
const error = new Error("observation aborted");
error.name = "AbortError";
return error;
}
function isAbortError(error: unknown): boolean {
return (
typeof error === "object" &&
error !== null &&
(error as { name?: string }).name === "AbortError"
);
}
function throwIfAborted(signal: AbortSignal | undefined): void {
if (signal?.aborted) throw captureAbortError();
}
/** Sparse array format Chrome uses for infrequently-set per-node fields. */
interface SparseArray {
index: number[];
value: number[];
}
interface RareBooleanData {
index: number[];
}
interface SnapshotDocument {
frameId?: string | number;
scrollOffsetX?: number;
scrollOffsetY?: number;
nodes?: {
parentIndex?: number[];
nodeName?: number[];
backendNodeId?: number[];
attributes?: number[][];
/**
* Per-node text value (index into strings), set for `#text` / CDATA nodes.
* Element nodes carry -1. Same length as `backendNodeId`.
*/
nodeValue?: number[];
/** Maps node array index → index into `documents[]` for frame content. */
contentDocumentIndex?: SparseArray;
inputValue?: SparseArray;
textValue?: SparseArray;
inputChecked?: RareBooleanData;
optionSelected?: RareBooleanData;
};
layout?: {
nodeIndex?: number[];
styles?: number[][];
bounds?: number[][];
paintOrders?: number[];
};
}
function snapshotFrameId(document: SnapshotDocument, strings: string[]): string | undefined {
if (typeof document.frameId === "string") return document.frameId || undefined;
if (typeof document.frameId === "number") return str(strings, document.frameId) || undefined;
return undefined;
}
interface SnapshotReply {
strings?: string[];
documents?: SnapshotDocument[];
}
function isFormControlTag(tag: string): boolean {
return tag === "input" || tag === "textarea" || tag === "select";
}
function isSensitiveFormControl(node: Pick<CapturedNode, "tag" | "attrs">): boolean {
return node.tag === "input" && (node.attrs.type ?? "").toLowerCase() === "password";
}
function snapshotFormState(
value: string | undefined,
defaultValue: string,
hasDefaultValue: boolean,
sensitive: boolean,
): CapturedNode["formState"] {
if (sensitive) {
if (value === undefined && !hasDefaultValue) return undefined;
return (value ?? defaultValue) === "" ? "empty" : "filled";
}
if (value === undefined) return undefined;
if (value === "") return "empty";
return value === defaultValue ? "default" : "filled";
}
const MAX_FORM_ENRICH_CONTROLS = 250;
interface CapturedFormState {
value?: string;
defaultValue?: string;
placeholder?: string;
state?: "empty" | "filled" | "default";
sensitive?: boolean;
}
interface DeepSerializedValue {
type: string;
value?: unknown;
}
function formStateBatchExpression(maxControls: number): string {
return `(() => {
const maxControls = ${JSON.stringify(maxControls)};
let remaining = maxControls;
const controlSelector = "input,textarea,select";
const controlState = (el) => {
const tag = el.tagName.toLowerCase();
const type = tag === "input" ? String(el.type || "text").toLowerCase() : tag;
const sensitive = type === "password" || type === "credit-card";
const rawValue = typeof el.value === "string" ? el.value : "";
const defaultValue = typeof el.defaultValue === "string" ? el.defaultValue : "";
const placeholder = typeof el.placeholder === "string" ? el.placeholder : "";
const state = rawValue === "" ? "empty" : rawValue === defaultValue ? "default" : "filled";
return {
state,
sensitive,
placeholder,
...(sensitive ? {} : { value: rawValue, defaultValue }),
};
};
const controls = [];
const collect = (doc) => {
for (const el of Array.from(doc.querySelectorAll(controlSelector))) {
if (remaining <= 0) break;
// Deep serialization supplies the node's backend id. Keep the
// state as JSON so decoding needs no general-purpose V8 deserializer.
controls.push([el, JSON.stringify(controlState(el))]);
remaining -= 1;
}
for (const frame of Array.from(doc.querySelectorAll("iframe"))) {
if (remaining <= 0) break;
let childDoc = null;
try { childDoc = frame.contentDocument; } catch { childDoc = null; }
if (childDoc) collect(childDoc);
}
};
collect(document);
return controls;
})()`;
}
function formStatesByBackendId(result: RuntimeEvaluateReply): Map<number, CapturedFormState> {
const states = new Map<number, CapturedFormState>();
const serialized = result.result?.deepSerializedValue;
if (serialized?.type !== "array" || !Array.isArray(serialized.value)) return states;
for (const entry of serialized.value as DeepSerializedValue[]) {
if (entry?.type !== "array" || !Array.isArray(entry.value)) continue;
const [element, json] = entry.value as DeepSerializedValue[];
if (element?.type !== "node" || json?.type !== "string" || typeof json.value !== "string") {
continue;
}
const backendNodeId = (element.value as { backendNodeId?: number } | undefined)?.backendNodeId;
if (typeof backendNodeId !== "number" || !Number.isSafeInteger(backendNodeId)) continue;
try {
const state = JSON.parse(json.value) as CapturedFormState | null;
if (
!state ||
!["empty", "filled", "default"].includes(state.state ?? "") ||
typeof state.sensitive !== "boolean" ||
typeof state.placeholder !== "string" ||
(!state.sensitive &&
(typeof state.value !== "string" || typeof state.defaultValue !== "string"))
) {
continue;
}
states.set(backendNodeId, state);
} catch {
// A malformed entry must not overwrite the snapshot's own state.
}
}
return states;
}
function applyFormStates(nodes: CapturedNode[], states: Map<number, CapturedFormState>): void {
for (const node of nodes) {
if (!isFormControlTag(node.tag)) continue;
const state = states.get(node.backendNodeId);
if (!state) continue;
node.formState = state.state;
node.formPlaceholder = state.placeholder ?? "";
if (state.sensitive || isSensitiveFormControl(node)) {
delete node.formValue;
delete node.formDefaultValue;
delete node.attrs.value;
} else {
node.formDefaultValue = state.defaultValue ?? "";
if (state.value !== undefined) node.formValue = state.value;
}
}
}
async function enrichFormControlStates(
cdp: CdpRunner,
tabId: number,
frameNodeGroups: CapturedNode[][],
signal?: AbortSignal,
): Promise<void> {
const hasControls = frameNodeGroups.some((nodes) =>
nodes.some((node) => isFormControlTag(node.tag)),
);
if (!hasControls) return;
const objectGroup = `bsk-vom-forms-${crypto.randomUUID()}`;
try {
throwIfAborted(signal);
const result = await cdp.send<RuntimeEvaluateReply>(tabId, "Runtime.evaluate", {
expression: formStateBatchExpression(MAX_FORM_ENRICH_CONTROLS),
objectGroup,
serializationOptions: {
serialization: "deep",
maxDepth: 3,
additionalParameters: { maxNodeDepth: 0, includeShadowTree: "none" },
},
});
throwIfAborted(signal);
// Backend ids are scoped to this capture's CDP target. OOPIF targets
// use their own captureViewModel call and never share this lookup.
const states = formStatesByBackendId(result);
for (const nodes of frameNodeGroups) {
applyFormStates(nodes, states);
}
} catch (error) {
if (isAbortError(error)) throw error;
// Best-effort enrichment. DOMSnapshot/AX data still carries the nodes.
} finally {
await cdp.send(tabId, "Runtime.releaseObjectGroup", { objectGroup }).catch(() => undefined);
}
}
interface RuntimeEvaluateReply {
result?: {
value?: unknown;
deepSerializedValue?: DeepSerializedValue;
};
}
@@ -352,36 +84,6 @@ interface CdpDomNode {
shadowRoots?: CdpDomNode[];
}
interface ParseDocumentResult {
nodes: CapturedNode[];
excludedBackendNodeIds: Set<number>;
}
interface FrameContext {
frameId?: string;
ownerFrameBackendNodeId: number | null;
projection: FrameProjectionState;
target: CdpTarget;
coordinates: SnapshotCoordinates | null;
layoutUnitsPerCssPixel: number | null;
}
function str(strings: string[], idx: number | undefined): string {
if (idx === undefined || idx < 0) return "";
return strings[idx] ?? "";
}
function sparseIndexMap(sparse: SparseArray | undefined): Map<number, number> {
const out = new Map<number, number>();
if (!sparse?.index || !sparse.value) return out;
for (let i = 0; i < sparse.index.length; i++) {
const nodeIndex = sparse.index[i];
const docIndex = sparse.value[i];
if (nodeIndex !== undefined && docIndex !== undefined) out.set(nodeIndex, docIndex);
}
return out;
}
function collectBackendIdsFromDomNode(node: CdpDomNode | undefined, out: Set<number>): void {
if (!node) return;
if (typeof node.backendNodeId === "number") {
@@ -791,198 +493,12 @@ export async function collectOverlayExcludedBackendIds(
return excluded;
}
/**
* Parse one DOMSnapshot document into CapturedNode[].
*
* @param doc - the raw DOMSnapshot document object
* @param strings - the shared string table for the whole snapshot
* @param context - frame coordinate context; output rects are top viewport-relative
*/
function parseDocumentNodes(
doc: SnapshotDocument,
strings: string[],
context: FrameContext,
): ParseDocumentResult {
const dn = doc.nodes;
const dl = doc.layout;
if (!dn?.backendNodeId) {
return { nodes: [], excludedBackendNodeIds: new Set() };
}
const count = dn.backendNodeId.length;
const layoutByNode = new Map<number, number>();
(dl?.nodeIndex ?? []).forEach((nodeIdx, layoutIdx) => layoutByNode.set(nodeIdx, layoutIdx));
// The agent's own overlay (WXT shadow host, marked with OVERLAY_HOST_MARKER_ATTR)
// is injected into the page and its open shadow root
// is inlined by DOMSnapshot as descendants of the host. Its fixed
// full-viewport click-blocker would otherwise dominate occlusion detection
// and hide the real page, so mark the host + its whole subtree excluded.
// parentIndex always references an earlier node, so one forward pass suffices.
const excluded = new Array<boolean>(count).fill(false);
const excludedBackendNodeIds = new Set<number>();
for (let n = 0; n < count; n++) {
const parentIdx = dn.parentIndex?.[n] ?? -1;
const inherited = parentIdx >= 0 && excluded[parentIdx];
let isOverlayHost = inherited;
if (!isOverlayHost) {
const pairs = dn.attributes?.[n] ?? [];
const attrNames: string[] = [];
for (let a = 0; a + 1 < pairs.length; a += 2) {
attrNames.push(str(strings, pairs[a]));
}
isOverlayHost = isOverlayHostNode(str(strings, dn.nodeName?.[n]), attrNames);
}
if (!isOverlayHost) continue;
excluded[n] = true;
const backendNodeId = dn.backendNodeId[n];
if (backendNodeId !== undefined) {
excludedBackendNodeIds.add(backendNodeId);
}
}
const posCol = STYLE_COL.position;
const peCol = STYLE_COL["pointer-events"];
const cursorCol = STYLE_COL.cursor;
const visibilityCol = STYLE_COL.visibility;
const opacityCol = STYLE_COL.opacity;
const inputValues = sparseIndexMap(dn.inputValue);
const textValues = sparseIndexMap(dn.textValue);
const checkedInputs = new Set(dn.inputChecked?.index ?? []);
const selectedOptions = new Set(dn.optionSelected?.index ?? []);
// Collect visible text from #text child nodes so element CapturedNodes
// carry a textContent value usable as a button/link label fallback.
// nodeValue is a parallel array: string index for text nodes, -1 otherwise.
const nodeTextContent = new Map<number, string>();
if (dn.nodeValue) {
for (let n = 0; n < count; n++) {
const nvIdx = dn.nodeValue[n] ?? -1;
if (nvIdx < 0) continue;
const text = str(strings, nvIdx).trim();
if (!text) continue;
const parentIdx = dn.parentIndex?.[n] ?? -1;
if (parentIdx >= 0) {
const existing = nodeTextContent.get(parentIdx);
nodeTextContent.set(parentIdx, existing ? `${existing} ${text}` : text);
}
}
}
// Build CapturedNodes.
const nodes: CapturedNode[] = [];
for (let n = 0; n < count; n++) {
if (excluded[n]) continue;
const backendNodeId = dn.backendNodeId[n];
const parentIdx = dn.parentIndex?.[n] ?? -1;
const parentBackendNodeId = parentIdx >= 0 ? (dn.backendNodeId[parentIdx] ?? null) : null;
const tag = str(strings, dn.nodeName?.[n]).toLowerCase();
const attrs: Record<string, string> = {};
const pairs = dn.attributes?.[n] ?? [];
for (let a = 0; a + 1 < pairs.length; a += 2) {
attrs[str(strings, pairs[a]).toLowerCase()] = str(strings, pairs[a + 1]);
}
let rect: Rect | null = null;
let localRect: Rect | null = null;
let paintOrder = 0;
let position = "static";
let pointerEvents = "auto";
let cursor = "auto";
let rendered = false;
const li = layoutByNode.get(n);
if (li !== undefined) {
const b = dl?.bounds?.[li];
if (b && b.length >= 4 && b[2] > 0 && b[3] > 0) {
const input = snapshotViewportRect(
b,
{ target: context.target, frameId: context.frameId },
context.coordinates,
);
if (input) {
const { x, y, width: w, height: h } = input.rect;
localRect = { x, y, w, h };
}
const bounds =
input && context.projection.status === "available"
? projectSnapshotRect(input, context.projection.projection)
: null;
rect = bounds ? { x: bounds.x, y: bounds.y, w: bounds.width, h: bounds.height } : null;
}
paintOrder = dl?.paintOrders?.[li] ?? 0;
const styleRow = dl?.styles?.[li] ?? [];
position = str(strings, styleRow[posCol]) || "static";
pointerEvents = str(strings, styleRow[peCol]) || "auto";
cursor = str(strings, styleRow[cursorCol]) || "auto";
const visibility = str(strings, styleRow[visibilityCol]) || "visible";
const opacity = str(strings, styleRow[opacityCol]) || "1";
rendered =
!!b &&
b.length >= 4 &&
b.slice(0, 4).every(Number.isFinite) &&
b[2] > 0 &&
b[3] > 0 &&
visibility !== "hidden" &&
visibility !== "collapse" &&
(Number.parseFloat(opacity) || 0) > 0;
}
// Skip non-element nodes (#text, #cdata-section, etc.) — they carry no
// geometry and are never queried by callers.
if (tag.startsWith("#")) continue;
const textContent = nodeTextContent.get(n);
const rawFormValueIndex = tag === "textarea" ? textValues.get(n) : inputValues.get(n);
const rawFormValue =
rawFormValueIndex !== undefined ? str(strings, rawFormValueIndex) : undefined;
const sensitive = isSensitiveFormControl({ tag, attrs });
const formDefaultValue = attrs.value ?? "";
const formValue = sensitive ? undefined : rawFormValue;
const formState = snapshotFormState(
rawFormValue,
formDefaultValue,
Object.prototype.hasOwnProperty.call(attrs, "value"),
sensitive,
);
if (sensitive) delete attrs.value;
nodes.push({
backendNodeId,
parentBackendNodeId,
...(context.frameId ? { frameId: context.frameId } : {}),
ownerFrameBackendNodeId: context.ownerFrameBackendNodeId,
tag,
attrs,
rect,
localRect,
paintOrder,
position,
pointerEvents,
cursor,
rendered,
textContent,
...(formValue !== undefined ? { formValue } : {}),
...(tag === "input" || tag === "textarea"
? {
formPlaceholder: attrs.placeholder ?? "",
...(!sensitive ? { formDefaultValue } : {}),
...(formState ? { formState } : {}),
}
: {}),
...(checkedInputs.has(n) ? { formValue: "true", formState: "filled" } : {}),
...(selectedOptions.has(n) ? { formValue: attrs.value ?? textContent ?? "" } : {}),
});
}
return { nodes, excludedBackendNodeIds };
}
interface ParseFrameDocumentsResult {
frameGeometryIssues: FrameProjectionIssue[];
iframeNodes: CapturedIframeNodes;
frameOwnerBackendNodeIds: Map<string, number>;
frameParentIds: Map<string, string>;
frameExcludedBackendNodeIds: Map<string, ReadonlySet<number>>;
excludedBackendNodeIds: Set<number>;
}
@@ -999,6 +515,7 @@ async function parseChildFrameDocuments(
const iframeNodes: CapturedIframeNodes = new Map();
const frameOwnerBackendNodeIds = new Map<string, number>();
const frameParentIds = new Map<string, string>();
const frameExcludedBackendNodeIds = new Map<string, ReadonlySet<number>>();
const excludedBackendNodeIds = new Set<number>();
const parentDoc = documents[parentDocIndex];
const cdi = sparseIndexMap(parentDoc?.nodes?.contentDocumentIndex);
@@ -1007,6 +524,7 @@ async function parseChildFrameDocuments(
iframeNodes,
frameOwnerBackendNodeIds,
frameParentIds,
frameExcludedBackendNodeIds,
excludedBackendNodeIds,
frameGeometryIssues,
};
@@ -1096,13 +614,14 @@ async function parseChildFrameDocuments(
};
const nextVisited = new Set(visited);
nextVisited.add(childDocIndex);
const parsed = parseDocumentNodes(childDoc, strings, childContext);
const parsed = await normalizeDocument(childDoc, strings, childContext, signal);
iframeNodes.set(iframeBackendId, parsed.nodes);
if (childContext.frameId) {
frameOwnerBackendNodeIds.set(childContext.frameId, iframeBackendId);
frameExcludedBackendNodeIds.set(childContext.frameId, parsed.index.excludedBackendNodeIds);
if (parentContext.frameId) frameParentIds.set(childContext.frameId, parentContext.frameId);
}
for (const id of parsed.excludedBackendNodeIds) excludedBackendNodeIds.add(id);
for (const id of parsed.index.excludedBackendNodeIds) excludedBackendNodeIds.add(id);
const nested = await parseChildFrameDocuments(
documents,
@@ -1123,6 +642,8 @@ async function parseChildFrameDocuments(
for (const [frameId, parentFrameId] of nested.frameParentIds) {
frameParentIds.set(frameId, parentFrameId);
}
for (const [frameId, excluded] of nested.frameExcludedBackendNodeIds)
frameExcludedBackendNodeIds.set(frameId, excluded);
for (const id of nested.excludedBackendNodeIds) excludedBackendNodeIds.add(id);
}
@@ -1130,6 +651,7 @@ async function parseChildFrameDocuments(
iframeNodes,
frameOwnerBackendNodeIds,
frameParentIds,
frameExcludedBackendNodeIds,
excludedBackendNodeIds,
frameGeometryIssues,
};
@@ -1201,9 +723,9 @@ export async function captureViewModel(
coordinates,
layoutUnitsPerCssPixel,
};
const mainParsed = parseDocumentNodes(doc0, strings, topContext);
const mainParsed = await normalizeDocument(doc0, strings, topContext, options.signal);
const nodes = mainParsed.nodes;
const excludedBackendNodeIds = new Set(mainParsed.excludedBackendNodeIds);
const excludedBackendNodeIds = new Set(mainParsed.index.excludedBackendNodeIds);
const ownerIds = new Set<number>();
for (const document of documents) {
@@ -1222,6 +744,11 @@ export async function captureViewModel(
options.signal,
);
const iframeNodes = frameParsed.iframeNodes;
if (topContext.frameId)
frameParsed.frameExcludedBackendNodeIds.set(
topContext.frameId,
mainParsed.index.excludedBackendNodeIds,
);
for (const id of frameParsed.excludedBackendNodeIds) {
excludedBackendNodeIds.add(id);
}
@@ -1251,6 +778,7 @@ export async function captureViewModel(
...frameParsed.frameGeometryIssues,
],
frameOwnerBackendNodeIds: frameParsed.frameOwnerBackendNodeIds,
frameExcludedBackendNodeIds: frameParsed.frameExcludedBackendNodeIds,
frameParentIds: frameParsed.frameParentIds,
...(topContext.frameId ? { rootFrameId: topContext.frameId } : {}),
excludedBackendNodeIds,
+94
View File
@@ -0,0 +1,94 @@
import { isOverlayHostNode } from "@/lib/overlay-bridge";
import { createCaptureCheckpoint } from "./capture-abort";
import type { CapturedNode } from "./capture-types";
/** Bounds retain their raw snapshot document layout units until normalization. */
export interface SnapshotLayout {
readonly boundsSpace: "snapshot-document-layout";
bounds?: number[];
styles: Readonly<Record<string, string>>;
}
export interface DecodedNode extends Omit<CapturedNode, "rect" | "localRect" | "rendered"> {
nodeType?: number;
layout?: SnapshotLayout;
}
export interface NodeFacts extends CapturedNode {
nodeType?: number;
layout?: SnapshotLayout;
}
export interface DocumentIndex<T extends DecodedNode = NodeFacts> {
readonly nodes: ReadonlyMap<number, T>;
readonly excludedBackendNodeIds: ReadonlySet<number>;
}
export interface DecodedDocument {
nodes: DecodedNode[];
}
/** All snapshot nodes participate, including document and shadow roots. This
* preserves overlay propagation when the semantic adapter omits those nodes. */
export async function buildDocumentIndex<T extends DecodedNode>(
input: readonly T[],
signal?: AbortSignal,
): Promise<DocumentIndex<T>> {
const checkpoint = createCaptureCheckpoint(signal);
const nodes = new Map<number, T>();
const overlayByNode = new Map<number, boolean>();
const excludedBackendNodeIds = new Set<number>();
for (let i = 0; i < input.length; i++) {
if (i % 256 === 0) {
const pending = checkpoint();
if (pending) await pending;
}
const node = input[i];
nodes.set(node.backendNodeId, node);
}
let work = 0;
for (const node of input) {
if (work++ % 256 === 0) {
const pending = checkpoint();
if (pending) await pending;
}
if (overlayByNode.has(node.backendNodeId)) continue;
const path: DecodedNode[] = [];
const visiting = new Set<number>();
let current: DecodedNode | undefined = node;
let overlay = false;
while (current && !overlayByNode.has(current.backendNodeId)) {
if (work++ % 256 === 0) {
const pending = checkpoint();
if (pending) await pending;
}
if (visiting.has(current.backendNodeId)) {
// Only an overlay inside the cycle may mark the cycle and its descendants.
overlay = path
.slice(path.findIndex((item) => item.backendNodeId === current!.backendNodeId))
.some((item) => isOverlayHostNode(item.tag, Object.keys(item.attrs)));
break;
}
visiting.add(current.backendNodeId);
path.push(current);
if (current.parentBackendNodeId === null) {
current = undefined;
break;
}
current = nodes.get(current.parentBackendNodeId);
}
if (current && overlayByNode.has(current.backendNodeId))
overlay = overlayByNode.get(current.backendNodeId)!;
for (let i = path.length - 1; i >= 0; i--) {
if (work++ % 256 === 0) {
const pending = checkpoint();
if (pending) await pending;
}
const item = path[i];
overlay = overlay || isOverlayHostNode(item.tag, Object.keys(item.attrs));
overlayByNode.set(item.backendNodeId, overlay);
if (overlay) excludedBackendNodeIds.add(item.backendNodeId);
}
}
return { nodes, excludedBackendNodeIds };
}
@@ -0,0 +1,155 @@
import type { CdpRunner } from "../shared";
import { isAbortError, throwIfAborted } from "./capture-abort";
import type { CapturedNode } from "./capture-types";
interface RuntimeEvaluateReply {
result?: { deepSerializedValue?: DeepSerializedValue };
}
const MAX_FORM_ENRICH_CONTROLS = 250;
interface CapturedFormState {
value?: string;
defaultValue?: string;
placeholder?: string;
state?: "empty" | "filled" | "default";
sensitive?: boolean;
}
interface DeepSerializedValue {
type: string;
value?: unknown;
}
function formStateBatchExpression(maxControls: number): string {
return `(() => {
const maxControls = ${JSON.stringify(maxControls)};
let remaining = maxControls;
const controlSelector = "input,textarea,select";
const controlState = (el) => {
const tag = el.tagName.toLowerCase();
const type = tag === "input" ? String(el.type || "text").toLowerCase() : tag;
const sensitive = type === "password" || type === "credit-card";
const rawValue = typeof el.value === "string" ? el.value : "";
const defaultValue = typeof el.defaultValue === "string" ? el.defaultValue : "";
const placeholder = typeof el.placeholder === "string" ? el.placeholder : "";
const state = rawValue === "" ? "empty" : rawValue === defaultValue ? "default" : "filled";
return {
state,
sensitive,
placeholder,
...(sensitive ? {} : { value: rawValue, defaultValue }),
};
};
const controls = [];
const collect = (doc) => {
for (const el of Array.from(doc.querySelectorAll(controlSelector))) {
if (remaining <= 0) break;
// Deep serialization supplies the node's backend id. Keep the
// state as JSON so decoding needs no general-purpose V8 deserializer.
controls.push([el, JSON.stringify(controlState(el))]);
remaining -= 1;
}
for (const frame of Array.from(doc.querySelectorAll("iframe"))) {
if (remaining <= 0) break;
let childDoc = null;
try { childDoc = frame.contentDocument; } catch { childDoc = null; }
if (childDoc) collect(childDoc);
}
};
collect(document);
return controls;
})()`;
}
function formStatesByBackendId(result: RuntimeEvaluateReply): Map<number, CapturedFormState> {
const states = new Map<number, CapturedFormState>();
const serialized = result.result?.deepSerializedValue;
if (serialized?.type !== "array" || !Array.isArray(serialized.value)) return states;
for (const entry of serialized.value as DeepSerializedValue[]) {
if (entry?.type !== "array" || !Array.isArray(entry.value)) continue;
const [element, json] = entry.value as DeepSerializedValue[];
if (element?.type !== "node" || json?.type !== "string" || typeof json.value !== "string") {
continue;
}
const backendNodeId = (element.value as { backendNodeId?: number } | undefined)?.backendNodeId;
if (typeof backendNodeId !== "number" || !Number.isSafeInteger(backendNodeId)) continue;
try {
const state = JSON.parse(json.value) as CapturedFormState | null;
if (
!state ||
!["empty", "filled", "default"].includes(state.state ?? "") ||
typeof state.sensitive !== "boolean" ||
typeof state.placeholder !== "string" ||
(!state.sensitive &&
(typeof state.value !== "string" || typeof state.defaultValue !== "string"))
) {
continue;
}
states.set(backendNodeId, state);
} catch {
// A malformed entry must not overwrite the snapshot's own state.
}
}
return states;
}
function applyFormStates(nodes: CapturedNode[], states: Map<number, CapturedFormState>): void {
for (const node of nodes) {
if (!["input", "textarea", "select"].includes(node.tag)) continue;
const state = states.get(node.backendNodeId);
if (!state) continue;
node.formState = state.state;
node.formPlaceholder = state.placeholder ?? "";
if (
state.sensitive ||
(node.tag === "input" && (node.attrs.type ?? "").toLowerCase() === "password")
) {
delete node.formValue;
delete node.formDefaultValue;
delete node.attrs.value;
} else {
node.formDefaultValue = state.defaultValue ?? "";
if (state.value !== undefined) node.formValue = state.value;
}
}
}
export async function enrichFormControlStates(
cdp: CdpRunner,
tabId: number,
frameNodeGroups: CapturedNode[][],
signal?: AbortSignal,
): Promise<boolean> {
const hasControls = frameNodeGroups.some((nodes) =>
nodes.some((node) => ["input", "textarea", "select"].includes(node.tag)),
);
if (!hasControls) return true;
const objectGroup = `bsk-vom-forms-${crypto.randomUUID()}`;
try {
throwIfAborted(signal);
const result = await cdp.send<RuntimeEvaluateReply>(tabId, "Runtime.evaluate", {
expression: formStateBatchExpression(MAX_FORM_ENRICH_CONTROLS),
objectGroup,
serializationOptions: {
serialization: "deep",
maxDepth: 3,
additionalParameters: { maxNodeDepth: 0, includeShadowTree: "none" },
},
});
throwIfAborted(signal);
// Backend ids are scoped to this capture's CDP target. OOPIF targets
// have separate enrichment calls and never share this lookup.
const states = formStatesByBackendId(result);
for (const nodes of frameNodeGroups) {
applyFormStates(nodes, states);
}
return true;
} catch (error) {
if (isAbortError(error)) throw error;
// Best-effort enrichment. DOMSnapshot/AX data still carries the nodes.
return false;
} finally {
await cdp.send(tabId, "Runtime.releaseObjectGroup", { objectGroup }).catch(() => undefined);
throwIfAborted(signal);
}
}
@@ -56,6 +56,11 @@ async function captureMissingFrameDocuments(
geometry,
target: frame.target,
});
if (child.frameExcludedBackendNodeIds?.size) {
captured.frameExcludedBackendNodeIds ??= new Map();
for (const [id, excluded] of child.frameExcludedBackendNodeIds)
captured.frameExcludedBackendNodeIds.set(id, excluded);
}
if (child.frameGeometryIssues?.length) {
(captured.frameGeometryIssues ??= []).push(...child.frameGeometryIssues);
}
@@ -174,5 +179,5 @@ export async function captureFrameData<T extends FrameAxNode>(
if (graph) await captureMissingFrameDocuments(cdp, tabId, graph, captured, geometry, signal);
throwIfAborted(signal);
const batches = await captureAxTrees<T>(cdp, tabId, frames, captured, signal);
return buildFrameDocuments(graph, batches, captured);
return buildFrameDocuments(graph, batches, captured, signal);
}
+80 -46
View File
@@ -4,7 +4,8 @@ import {
type CdpTarget,
cdpTargetKey,
} from "@/browser-driver/frame-graph";
import type { CapturedNode, CapturedViewModel } from "./capture";
import { createCaptureCheckpoint } from "./capture-abort";
import type { CapturedNode } from "./capture-types";
export interface FrameOwnedAxNode {
nodeId: string;
@@ -23,6 +24,17 @@ export interface FrameDocument<T extends FrameOwnedAxNode> extends CdpFrame {
contextScopeId: string;
axNodes: T[];
domNodes: CapturedNode[];
excludedBackendNodeIds?: ReadonlySet<number>;
}
/** Explicit snapshot document data used to join DOM and AX ownership. */
export interface FrameDomInput {
nodes: CapturedNode[];
rootFrameId?: string;
frameNodes?: ReadonlyMap<string, CapturedNode[]>;
frameOwnerBackendNodeIds?: ReadonlyMap<string, number>;
frameParentIds?: ReadonlyMap<string, string>;
frameExcludedBackendNodeIds?: ReadonlyMap<string, ReadonlySet<number>>;
}
interface Ownership {
@@ -47,7 +59,7 @@ function targetBackendKey(target: CdpTarget, backendNodeId: number): string {
function frameList<T extends FrameOwnedAxNode>(
graph: CdpFrameGraph | null,
batches: FrameAxBatch<T>[],
captured: CapturedViewModel,
captured: FrameDomInput,
): CdpFrame[] {
const frames = new Map<string, CdpFrame>();
for (const frame of graph?.frames ?? []) frames.set(frame.frameId, frame);
@@ -70,11 +82,14 @@ function frameList<T extends FrameOwnedAxNode>(
});
}
export function buildFrameDocuments<T extends FrameOwnedAxNode>(
export async function buildFrameDocuments<T extends FrameOwnedAxNode>(
graph: CdpFrameGraph | null,
batches: FrameAxBatch<T>[],
captured: CapturedViewModel,
): FrameDocument<T>[] {
captured: FrameDomInput,
signal?: AbortSignal,
): Promise<FrameDocument<T>[]> {
const checkpoint = createCaptureCheckpoint(signal);
let work = 0;
const frames = frameList(graph, batches, captured);
const frameById = new Map(frames.map((frame) => [frame.frameId, frame]));
const rootFrameId = graph?.rootFrameId ?? captured.rootFrameId ?? frames[0]?.frameId;
@@ -83,54 +98,68 @@ export function buildFrameDocuments<T extends FrameOwnedAxNode>(
const backendOwner = new Map<string, string>();
for (const frame of frames) {
for (const node of domNodesForFrame(frame.frameId)) {
if (work++ % 256 === 0) {
const pending = checkpoint();
if (pending) await pending;
}
backendOwner.set(targetBackendKey(frame.target, node.backendNodeId), frame.frameId);
}
}
const candidates = new Map<string, OwnedCandidate<T>>();
for (const batch of batches) {
const nodeById = new Map(batch.nodes.map((node) => [node.nodeId, node]));
const ownershipByNodeId = new Map<string, Ownership>();
const resolving = new Set<string>();
const resolveOwnership = (node: T): Ownership => {
const cached = ownershipByNodeId.get(node.nodeId);
if (cached) return cached;
if (node.frameId && frameById.has(node.frameId)) {
const ownership = { frameId: node.frameId, strength: 4 };
ownershipByNodeId.set(node.nodeId, ownership);
return ownership;
}
if (typeof node.backendDOMNodeId === "number") {
const frameId = backendOwner.get(
targetBackendKey(batch.frame.target, node.backendDOMNodeId),
);
if (frameId) {
const ownership = { frameId, strength: 3 };
ownershipByNodeId.set(node.nodeId, ownership);
return ownership;
}
}
if (node.parentId && !resolving.has(node.nodeId)) {
const parent = nodeById.get(node.parentId);
if (parent) {
resolving.add(node.nodeId);
const inherited = resolveOwnership(parent);
resolving.delete(node.nodeId);
const ownership = {
frameId: inherited.frameId,
strength: Math.min(2, inherited.strength),
};
ownershipByNodeId.set(node.nodeId, ownership);
return ownership;
}
}
const ownership = { frameId: batch.frame.frameId, strength: 1 };
ownershipByNodeId.set(node.nodeId, ownership);
return ownership;
};
const nodeById = new Map<string, T>();
for (const node of batch.nodes) {
const ownership = resolveOwnership(node);
if (work++ % 256 === 0) {
const pending = checkpoint();
if (pending) await pending;
}
nodeById.set(node.nodeId, node);
}
const ownershipByNodeId = new Map<string, Ownership>();
for (const node of batch.nodes) {
const path: T[] = [];
const visiting = new Set<string>();
let current: T | undefined = node;
let ownership: Ownership = { frameId: batch.frame.frameId, strength: 1 };
while (current) {
if (work++ % 256 === 0) {
const pending = checkpoint();
if (pending) await pending;
}
const cached = ownershipByNodeId.get(current.nodeId);
if (cached) {
ownership = cached;
break;
}
if (visiting.has(current.nodeId)) break;
visiting.add(current.nodeId);
if (current.frameId && frameById.has(current.frameId)) {
ownership = { frameId: current.frameId, strength: 4 };
ownershipByNodeId.set(current.nodeId, ownership);
break;
}
const frameId =
typeof current.backendDOMNodeId === "number"
? backendOwner.get(targetBackendKey(batch.frame.target, current.backendDOMNodeId))
: undefined;
if (frameId) {
ownership = { frameId, strength: 3 };
ownershipByNodeId.set(current.nodeId, ownership);
break;
}
path.push(current);
current = current.parentId ? nodeById.get(current.parentId) : undefined;
}
for (let i = path.length - 1; i >= 0; i--) {
if (work++ % 256 === 0) {
const pending = checkpoint();
if (pending) await pending;
}
ownership = { frameId: ownership.frameId, strength: Math.min(2, ownership.strength) };
ownershipByNodeId.set(path[i].nodeId, ownership);
}
if (!ownershipByNodeId.has(node.nodeId)) ownershipByNodeId.set(node.nodeId, ownership);
const key = targetNodeKey(batch.frame.target, node.nodeId);
const existing = candidates.get(key);
if (!existing || ownership.strength > existing.ownership.strength) {
@@ -144,6 +173,10 @@ export function buildFrameDocuments<T extends FrameOwnedAxNode>(
);
const axNodesByFrame = new Map<string, T[]>();
for (const candidate of candidates.values()) {
if (work++ % 256 === 0) {
const pending = checkpoint();
if (pending) await pending;
}
const { node, target, ownership } = candidate;
const parentFrameId = node.parentId
? ownershipByTargetNode.get(targetNodeKey(target, node.parentId))
@@ -169,5 +202,6 @@ export function buildFrameDocuments<T extends FrameOwnedAxNode>(
contextScopeId: frame.frameId,
axNodes: axNodesByFrame.get(frame.frameId) ?? [],
domNodes: domNodesForFrame(frame.frameId),
excludedBackendNodeIds: captured.frameExcludedBackendNodeIds?.get(frame.frameId),
}));
}
+78
View File
@@ -0,0 +1,78 @@
import type { CdpTarget } from "@/browser-driver/frame-graph";
import {
type FrameProjectionState,
projectSnapshotRect,
type SnapshotCoordinates,
snapshotViewportRect,
} from "../geometry/coordinate-types";
import { createCaptureCheckpoint } from "./capture-abort";
import { buildDocumentIndex, type DocumentIndex, type NodeFacts } from "./facts";
import { decodeDocument, type SnapshotDocument } from "./snapshot";
export interface FrameContext {
frameId?: string;
ownerFrameBackendNodeId: number | null;
projection: FrameProjectionState;
target: CdpTarget;
coordinates: SnapshotCoordinates | null;
layoutUnitsPerCssPixel: number | null;
}
export interface NormalizedDocument {
nodes: NodeFacts[];
index: DocumentIndex;
}
/** Interpret one document using a supplied projection. No live reads or frame scheduling. */
export async function normalizeDocument(
doc: SnapshotDocument,
strings: string[],
context: FrameContext,
signal?: AbortSignal,
): Promise<NormalizedDocument> {
const decoded = await decodeDocument(doc, strings, signal);
const checkpoint = createCaptureCheckpoint(signal);
const nodes: NodeFacts[] = [];
for (let i = 0; i < decoded.nodes.length; i++) {
if (i % 256 === 0) {
const pending = checkpoint();
if (pending) await pending;
}
const node = decoded.nodes[i];
const bounds = node.layout?.bounds ?? [];
const input = snapshotViewportRect(
bounds,
{ target: context.target, frameId: context.frameId },
context.coordinates,
);
const local = input?.rect;
const rect =
input && context.projection.status === "available"
? projectSnapshotRect(input, context.projection.projection)
: null;
const visibility = node.layout?.styles.visibility || "visible";
const opacity = node.layout?.styles.opacity || "1";
nodes.push({
...node,
...(context.frameId ? { frameId: context.frameId } : {}),
ownerFrameBackendNodeId: context.ownerFrameBackendNodeId,
localRect: local ? { x: local.x, y: local.y, w: local.width, h: local.height } : null,
rect: rect ? { x: rect.x, y: rect.y, w: rect.width, h: rect.height } : null,
rendered:
bounds.length >= 4 &&
bounds.slice(0, 4).every(Number.isFinite) &&
bounds[2] > 0 &&
bounds[3] > 0 &&
visibility !== "hidden" &&
visibility !== "collapse" &&
(Number.parseFloat(opacity) || 0) > 0,
});
}
const index = await buildDocumentIndex(nodes, signal);
return {
nodes: nodes.filter(
(node) => !node.tag.startsWith("#") && !index.excludedBackendNodeIds.has(node.backendNodeId),
),
index,
};
}
@@ -2,7 +2,10 @@ import type { Rect, RenderedRef, VomResult } from "@browser-skill/vom";
import type { CdpTarget } from "@/browser-driver/frame-graph";
import { readRecordingDocumentIdentity } from "@/shared/recording-document-identity";
import type { CapturedSurfaceProbe } from "./capture";
import type { CapturedFrameDocument, FrameAxNode } from "./frame-capture";
import type {
FrameDocument as CapturedFrameDocument,
FrameOwnedAxNode as FrameAxNode,
} from "./frame-document";
/** Frame identity needed to resolve an `@eN` that lives in an iframe. */
export interface CaptureVomFrame {
@@ -61,8 +61,9 @@ export function buildSemanticGraph(input: BuildSemanticGraphInput): SemanticGrap
dom,
sourceOrder: index,
excluded:
document.frameId === rootFrameId &&
input.excludedBackendNodeIds?.has(dom.backendNodeId) === true,
document.excludedBackendNodeIds?.has(dom.backendNodeId) === true ||
(document.frameId === rootFrameId &&
input.excludedBackendNodeIds?.has(dom.backendNodeId) === true),
};
nodes.set(id, node);
frameNodeIds.push(id);
@@ -90,9 +91,10 @@ export function buildSemanticGraph(input: BuildSemanticGraphInput): SemanticGrap
ax,
sourceOrder: document.domNodes.length + index,
excluded:
document.frameId === rootFrameId &&
typeof ax.backendDOMNodeId === "number" &&
input.excludedBackendNodeIds?.has(ax.backendDOMNodeId) === true,
(document.excludedBackendNodeIds?.has(ax.backendDOMNodeId) === true ||
(document.frameId === rootFrameId &&
input.excludedBackendNodeIds?.has(ax.backendDOMNodeId) === true)),
});
frameNodeIds.push(id);
}
+224
View File
@@ -0,0 +1,224 @@
import { createCaptureCheckpoint } from "./capture-abort";
import type { CapturedNode } from "./capture-types";
import type { DecodedDocument, DecodedNode } from "./facts";
export const REQUESTED_STYLES = [
"position",
"pointer-events",
"cursor",
"visibility",
"opacity",
] as const;
const STYLE_COL = Object.fromEntries(
REQUESTED_STYLES.map((name, index) => [name, index]),
) as Record<(typeof REQUESTED_STYLES)[number], number>;
/** Sparse array format Chrome uses for infrequently-set per-node fields. */
interface SparseArray {
index: number[];
value: number[];
}
interface RareBooleanData {
index: number[];
}
export interface SnapshotDocument {
frameId?: string | number;
scrollOffsetX?: number;
scrollOffsetY?: number;
nodes?: {
parentIndex?: number[];
nodeName?: number[];
nodeType?: number[];
backendNodeId?: number[];
attributes?: number[][];
/**
* Per-node text value (index into strings), set for `#text` / CDATA nodes.
* Element nodes carry -1. Same length as `backendNodeId`.
*/
nodeValue?: number[];
/** Maps node array index → index into `documents[]` for frame content. */
contentDocumentIndex?: SparseArray;
inputValue?: SparseArray;
textValue?: SparseArray;
inputChecked?: RareBooleanData;
optionSelected?: RareBooleanData;
};
layout?: {
nodeIndex?: number[];
styles?: number[][];
bounds?: number[][];
paintOrders?: number[];
};
}
export function snapshotFrameId(document: SnapshotDocument, strings: string[]): string | undefined {
if (typeof document.frameId === "string") return document.frameId || undefined;
if (typeof document.frameId === "number") return str(strings, document.frameId) || undefined;
return undefined;
}
export interface SnapshotReply {
strings?: string[];
documents?: SnapshotDocument[];
}
function isSensitiveFormControl(node: Pick<CapturedNode, "tag" | "attrs">): boolean {
return node.tag === "input" && (node.attrs.type ?? "").toLowerCase() === "password";
}
function snapshotFormState(
value: string | undefined,
defaultValue: string,
hasDefaultValue: boolean,
sensitive: boolean,
): CapturedNode["formState"] {
if (sensitive) {
if (value === undefined && !hasDefaultValue) return undefined;
return (value ?? defaultValue) === "" ? "empty" : "filled";
}
if (value === undefined) return undefined;
if (value === "") return "empty";
return value === defaultValue ? "default" : "filled";
}
function str(strings: string[], idx: number | undefined): string {
if (idx === undefined || idx < 0) return "";
return strings[idx] ?? "";
}
export function sparseIndexMap(sparse: SparseArray | undefined): Map<number, number> {
const out = new Map<number, number>();
if (!sparse?.index || !sparse.value) return out;
for (let i = 0; i < sparse.index.length; i++) {
const nodeIndex = sparse.index[i];
const docIndex = sparse.value[i];
if (nodeIndex !== undefined && docIndex !== undefined) out.set(nodeIndex, docIndex);
}
return out;
}
export async function decodeDocument(
doc: SnapshotDocument,
strings: string[],
signal?: AbortSignal,
): Promise<DecodedDocument> {
const checkpoint = createCaptureCheckpoint(signal);
const dn = doc.nodes;
const dl = doc.layout;
if (!dn?.backendNodeId) {
return { nodes: [] };
}
const count = dn.backendNodeId.length;
const layoutByNode = new Map<number, number>();
for (let i = 0; i < (dl?.nodeIndex?.length ?? 0); i++) {
if (i % 256 === 0) {
const pending = checkpoint();
if (pending) await pending;
}
layoutByNode.set(dl!.nodeIndex![i], i);
}
const inputValues = sparseIndexMap(dn.inputValue);
const textValues = sparseIndexMap(dn.textValue);
const checkedInputs = new Set(dn.inputChecked?.index ?? []);
const selectedOptions = new Set(dn.optionSelected?.index ?? []);
// Collect visible text from #text child nodes so element CapturedNodes
// carry a textContent value usable as a button/link label fallback.
// nodeValue is a parallel array: string index for text nodes, -1 otherwise.
const nodeTextContent = new Map<number, string[]>();
if (dn.nodeValue) {
for (let n = 0; n < count; n++) {
if (n % 256 === 0) {
const pending = checkpoint();
if (pending) await pending;
}
const nvIdx = dn.nodeValue[n] ?? -1;
if (nvIdx < 0) continue;
const text = str(strings, nvIdx).trim();
if (!text) continue;
const parentIdx = dn.parentIndex?.[n] ?? -1;
if (parentIdx >= 0) {
const existing = nodeTextContent.get(parentIdx);
if (existing) existing.push(text);
else nodeTextContent.set(parentIdx, [text]);
}
}
}
// Decode fields without assigning a coordinate projection or semantic policy.
const nodes: DecodedNode[] = [];
for (let n = 0; n < count; n++) {
if (n % 256 === 0) {
const pending = checkpoint();
if (pending) await pending;
}
const backendNodeId = dn.backendNodeId[n];
const parentIdx = dn.parentIndex?.[n] ?? -1;
const parentBackendNodeId = parentIdx >= 0 ? (dn.backendNodeId[parentIdx] ?? null) : null;
const tag = str(strings, dn.nodeName?.[n]).toLowerCase();
const attrs: Record<string, string> = {};
const pairs = dn.attributes?.[n] ?? [];
for (let a = 0; a + 1 < pairs.length; a += 2) {
attrs[str(strings, pairs[a]).toLowerCase()] = str(strings, pairs[a + 1]);
}
const li = layoutByNode.get(n);
const styleRow = li === undefined ? [] : (dl?.styles?.[li] ?? []);
const styles: Record<string, string> = {};
for (const name of REQUESTED_STYLES) styles[name] = str(strings, styleRow[STYLE_COL[name]]);
const layout =
li === undefined
? undefined
: {
boundsSpace: "snapshot-document-layout" as const,
bounds: dl?.bounds?.[li],
styles,
};
const textContent = nodeTextContent.get(n)?.join(" ");
const rawFormValueIndex = tag === "textarea" ? textValues.get(n) : inputValues.get(n);
const rawFormValue =
rawFormValueIndex !== undefined ? str(strings, rawFormValueIndex) : undefined;
const sensitive = isSensitiveFormControl({ tag, attrs });
const formDefaultValue = attrs.value ?? "";
const formValue = sensitive ? undefined : rawFormValue;
const formState = snapshotFormState(
rawFormValue,
formDefaultValue,
Object.prototype.hasOwnProperty.call(attrs, "value"),
sensitive,
);
if (sensitive) delete attrs.value;
nodes.push({
backendNodeId,
nodeType: dn.nodeType?.[n],
parentBackendNodeId,
tag,
attrs,
layout,
paintOrder: li === undefined ? 0 : (dl?.paintOrders?.[li] ?? 0),
position: styles.position || "static",
pointerEvents: styles["pointer-events"] || "auto",
cursor: styles.cursor || "auto",
textContent,
...(formValue !== undefined ? { formValue } : {}),
...(tag === "input" || tag === "textarea"
? {
formPlaceholder: attrs.placeholder ?? "",
...(!sensitive ? { formDefaultValue } : {}),
...(formState ? { formState } : {}),
}
: {}),
...(checkedInputs.has(n) ? { formValue: "true", formState: "filled" } : {}),
...(selectedOptions.has(n) ? { formValue: attrs.value ?? textContent ?? "" } : {}),
});
}
return { nodes };
}