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import type { AxNodeResult } from "../cdp/commands";
import type { BrowserClient } from "../client";
import type { Box } from "./box";
import { cdpCall } from "./cdp-call";
export type RawAxNode = AxNodeResult;
type AxValue = NonNullable<RawAxNode["role"]>;
export type SlimNode = {
role: string;
name?: string;
value?: string;
description?: string;
state?: string;
children: SlimNode[];
_backendId?: number;
ref?: string;
box?: Box;
};
export const INTERACTIVE_ROLES = new Set([
"button",
"link",
"textbox",
"checkbox",
"radio",
"combobox",
"menuitem",
"tab",
"switch",
"slider",
"searchbox",
"spinbutton",
]);
// The AX `value` is stale for freshly-typed or controlled inputs, so for these roles the live DOM property is read instead.
export const VALUE_ROLES = new Set([
"textbox",
"searchbox",
"spinbutton",
"combobox",
"checkbox",
"radio",
"switch",
"slider",
]);
const stringOf = (v: AxValue | undefined): string | undefined => {
const x = v?.value;
if (typeof x === "string" && x !== "") return x;
if (typeof x === "number") return String(x);
return undefined;
};
const collectState = (props: RawAxNode["properties"]): string | undefined => {
if (!props || props.length === 0) return undefined;
const flags: string[] = [];
for (const p of props) {
const name = p.name;
if (!name) continue;
const raw = p.value?.value;
if (raw === true && (name === "focused" || name === "required" || name === "disabled" || name === "checked" || name === "expanded" || name === "selected" || name === "pressed" || name === "modal")) {
flags.push(name);
}
if (typeof raw === "number" && name === "level") flags.push(`level ${raw}`);
}
return flags.length > 0 ? flags.join(", ") : undefined;
};
export const buildTree = (
rawNodes: ReadonlyArray<RawAxNode>,
opts: { interestingOnly: boolean; maxNodes: number },
): SlimNode[] => {
const byId = new Map<string, RawAxNode>();
for (const n of rawNodes) byId.set(n.nodeId, n);
const rootIds: string[] = [];
for (const n of rawNodes) {
if (!n.parentId || !byId.has(n.parentId)) rootIds.push(n.nodeId);
}
let budget = opts.maxNodes;
const slim = (node: RawAxNode): SlimNode | undefined => {
if (budget <= 0) return undefined;
if (opts.interestingOnly && node.ignored) {
// Chrome often ignores wrapper divs while their descendants remain meaningful, so recurse through an ignored node's children.
const out: SlimNode[] = [];
for (const cid of node.childIds ?? []) {
const child = byId.get(cid);
if (!child) continue;
const slimChild = slim(child);
if (slimChild) out.push(slimChild);
}
return out.length > 0 ? { role: "_hoist", children: out } : undefined;
}
budget--;
const role = stringOf(node.role) ?? "unknown";
const name = stringOf(node.name);
const value = stringOf(node.value);
const description = stringOf(node.description);
const state = collectState(node.properties);
const children: SlimNode[] = [];
for (const cid of node.childIds ?? []) {
const child = byId.get(cid);
if (!child) continue;
const slimChild = slim(child);
if (!slimChild) continue;
if (slimChild.role === "_hoist") children.push(...slimChild.children);
else children.push(slimChild);
}
const out: SlimNode = { role, children };
if (name !== undefined) out.name = name;
if (value !== undefined) out.value = value;
if (description !== undefined) out.description = description;
if (state !== undefined) out.state = state;
if (node.backendDOMNodeId !== undefined) out._backendId = node.backendDOMNodeId;
return out;
};
const result: SlimNode[] = [];
for (const rid of rootIds) {
const root = byId.get(rid);
if (!root) continue;
const s = slim(root);
if (!s) continue;
if (s.role === "_hoist") result.push(...s.children);
else result.push(s);
}
return result;
};
export const countNodes = (nodes: ReadonlyArray<SlimNode>): number => {
let n = 0;
for (const node of nodes) n += 1 + countNodes(node.children);
return n;
};
export const stripInternals = (nodes: ReadonlyArray<SlimNode>): SlimNode[] =>
nodes.map((n) => {
const { _backendId: _bid, ...rest } = n;
return { ...rest, children: stripInternals(n.children) };
});
export const collectInteractiveTargets = (
nodes: ReadonlyArray<SlimNode>,
): Array<{ node: SlimNode; backendId: number }> => {
const out: Array<{ node: SlimNode; backendId: number }> = [];
const walk = (ns: ReadonlyArray<SlimNode>): void => {
for (const n of ns) {
if (n._backendId !== undefined && INTERACTIVE_ROLES.has(n.role)) {
out.push({ node: n, backendId: n._backendId });
}
walk(n.children);
}
};
walk(nodes);
return out;
};
export const liveValue = async (client: BrowserClient, backendId: number): Promise<string | undefined> => {
const resolved = await cdpCall(client, "DOM.resolveNode", { backendNodeId: backendId });
if (!resolved.success) return undefined;
const objectId = resolved.data.object.objectId;
if (!objectId) return undefined;
const fn = `function () {
if (this.type === "checkbox" || this.type === "radio") return this.checked ? "checked" : "unchecked";
if (typeof this.value === "string") return this.value;
return null;
}`;
const r = await cdpCall(client, "Runtime.callFunctionOn", {
objectId,
functionDeclaration: fn,
returnByValue: true,
});
if (!r.success) return undefined;
const value = r.data.result.value;
return typeof value === "string" ? value : undefined;
};
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