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* Backs the manual "Analyze a region" flow (spec FR-023, FR-024, FR-024a) —
* both the pointer overlay and the panel's keyboard candidate list feed
* through here, since FR-024b requires the two paths to see the same
* candidates and the same measure of each.
*
* Every operation below is one `chrome.scripting.executeScript` call into a
* single self-contained dispatch function, `pickerPageScript`. It is
* serialized by `func.toString()` and runs in an isolated world with no
* access to this module's scope (research R2, and the same constraint
* `extractPage` and `selectionService.ts` document) — so every helper it
* needs (the FR-012 scorer from `lib/pageExtractor.ts`'s `scoreCandidate`,
* the selector-path logic from `lib/selectorPath.ts`) is duplicated as a
* nested function INSIDE it, the same documented exception plan.md records
* for `extension/scripts/corpusProbe.ts`. Folding every command (list,
* highlight, clear, resolve, pointer-pick) into ONE dispatch function keeps
* that duplication to a single copy rather than one per entry point.
*/
/** One candidate the scorer considered, ranked (FR-024b: label, length, excerpt). */
export interface PickerCandidate {
selector: string;
label: string;
textLength: number;
excerpt: string;
}
export type CommitOutcome = { ok: true; text: string } | { ok: false; reason: string };
export type PointerPickOutcome =
| { ok: true; text: string; selector: string }
| { ok: false; reason: string };
export type PickerCommand =
| { type: "beginSession" }
| { type: "list" }
| { type: "highlight"; selector: string }
| { type: "clearHighlight" }
| { type: "resolveText"; selector: string }
| { type: "pointerPick" }
| { type: "cancelPointerPick" };
export type PickerPageResult =
| { kind: "candidates"; candidates: PickerCandidate[] }
| { kind: "void" }
| { kind: "commit"; outcome: CommitOutcome }
| { kind: "pointerPick"; outcome: PointerPickOutcome };
/**
* Runs inside the target page via executeScript. Self-contained by the same
* rule as `extractPage` — exported so it can be unit-tested directly (jsdom
* has no `innerText`, so length/ordering assertions use the `textContent`
* fallback, same tradeoff research R9 documents for the extractor tests).
*/
export async function pickerPageScript(command: PickerCommand): Promise<PickerPageResult> {
const NOISE_SELECTOR = "nav, header, footer, aside, script, style, noscript";
const NOISE_KEYWORDS_RE =
/nav|menu|footer|cookie|consent|banner|sidebar|related|similar|promo|skip/i;
const CANDIDATE_MIN_CHARS = 200;
const MACHINE_GENERATED_RE = /^(css|sc|jsx|emotion)-|[-_][a-z0-9]{5,}$/i;
const MAX_SEGMENTS = 4;
const EXCERPT_MAX = 120;
const HIGHLIGHT_ATTR = "data-jpa-picker-highlight";
const CURSOR_BADGE_ID = "jpa-picker-cursor-badge";
// Cap on the ranked list shown in the panel (FR-024b) — enough to cover
// every corpus fixture's real candidates without overwhelming a
// screen-reader user. Must live INSIDE this function: it is serialized by
// `func.toString()` for executeScript, and a module-scope const referenced
// from here is a ReferenceError at runtime, not a closure capture.
const MAX_CANDIDATES = 8;
function textOf(element: Element): string {
const clone = element.cloneNode(true) as HTMLElement;
for (const noise of Array.from(clone.querySelectorAll(NOISE_SELECTOR))) {
noise.remove();
}
const raw: string = (clone as { innerText?: string }).innerText ?? clone.textContent ?? "";
return raw
.replace(/[ \t]+/g, " ")
.replace(/\s*\n\s*/g, "\n")
.trim();
}
function attrsOf(el: Element): string {
const id = typeof el.id === "string" ? el.id : "";
const className = typeof el.className === "string" ? el.className : "";
const role = el.getAttribute("role") ?? "";
let dataAttrs = "";
for (const attr of Array.from(el.attributes)) {
if (attr.name.startsWith("data-")) dataAttrs += ` ${attr.value}`;
}
return `${id} ${className} ${role}${dataAttrs}`;
}
// Duplicated from lib/pageExtractor.ts's scoreCandidate (FR-012) — ranking
// shown to a hand-scoping user must match what the automatic path would
// have picked, per FR-024b.
function scoreCandidate(el: Element): { text: string; score: number } | null {
if (el.matches(NOISE_SELECTOR)) return null;
const text = textOf(el);
if (text.length < CANDIDATE_MIN_CHARS) return null;
const clone = el.cloneNode(true) as HTMLElement;
for (const noise of Array.from(clone.querySelectorAll(NOISE_SELECTOR))) {
noise.remove();
}
let anchorLength = 0;
for (const anchor of Array.from(clone.querySelectorAll("a"))) {
anchorLength += (anchor.textContent ?? "").length;
}
const linkDensity = text.length > 0 ? Math.min(1, anchorLength / text.length) : 0;
let selfOrAncestorNoisy = false;
for (
let node: Element | null = el;
node && node !== document.body && node !== document.documentElement;
node = node.parentElement
) {
if (NOISE_KEYWORDS_RE.test(attrsOf(node))) {
selfOrAncestorNoisy = true;
break;
}
}
let noiseDescendantLength = 0;
if (!selfOrAncestorNoisy) {
const seen = new Set<Element>();
for (const descendant of Array.from(clone.querySelectorAll("*"))) {
if (!NOISE_KEYWORDS_RE.test(attrsOf(descendant))) continue;
let counted = false;
for (const seenEl of seen) {
if (seenEl.contains(descendant)) {
counted = true;
break;
}
}
if (counted) continue;
seen.add(descendant);
noiseDescendantLength += textOf(descendant).length;
}
}
const noiseFraction = text.length > 0 ? noiseDescendantLength / text.length : 0;
const penalty = selfOrAncestorNoisy ? 0.1 : Math.max(0.15, 1 - noiseFraction);
const score = text.length * (1 - linkDensity) * penalty;
return { text, score };
}
// Duplicated from lib/selectorPath.ts — see file header for why.
function humanClasses(el: Element): string[] {
return Array.from(el.classList).filter((c) => c.length > 0 && !MACHINE_GENERATED_RE.test(c));
}
function firstDataAttribute(el: Element): string | null {
for (const attr of Array.from(el.attributes)) {
if (attr.name.startsWith("data-")) return attr.name;
}
return null;
}
function nthOfType(el: Element): number {
const parent = el.parentElement;
if (!parent) return 1;
const siblings = Array.from(parent.children).filter((c) => c.tagName === el.tagName);
return siblings.indexOf(el) + 1;
}
function segmentFor(el: Element): { value: string; anchor: boolean } {
const tag = el.tagName.toLowerCase();
if (el.id && !MACHINE_GENERATED_RE.test(el.id)) return { value: `#${el.id}`, anchor: true };
const dataAttr = firstDataAttribute(el);
if (dataAttr) return { value: `[${dataAttr}]`, anchor: true };
const classes = humanClasses(el);
if (classes.length > 0) return { value: `${tag}.${classes.join(".")}`, anchor: false };
return { value: `${tag}:nth-of-type(${nthOfType(el)})`, anchor: false };
}
function selectorPath(el: Element): string {
const segments: string[] = [];
let node: Element | null = el;
while (
node &&
node !== document.body &&
node !== document.documentElement &&
segments.length < MAX_SEGMENTS
) {
const segment = segmentFor(node);
segments.unshift(segment.value);
if (segment.anchor) break;
node = node.parentElement;
}
return segments.join(" > ");
}
function excerptOf(text: string): string {
const collapsed = text.replace(/\s+/g, " ").trim();
if (collapsed.length <= EXCERPT_MAX) return collapsed;
const cut = collapsed.slice(0, EXCERPT_MAX);
const lastSpace = cut.lastIndexOf(" ");
return `${(lastSpace > 40 ? cut.slice(0, lastSpace) : cut).trim()}…`;
}
function labelFor(el: Element): string {
const tag = el.tagName.toLowerCase();
if (tag === "main" || el.getAttribute("role") === "main") return "Main content";
if (tag === "article") return "Article";
const aria = el.getAttribute("aria-label");
if (aria && aria.trim().length > 0) return aria.trim().slice(0, 40);
const humanCls = humanClasses(el)[0];
if (humanCls) return humanCls.replace(/[-_]+/g, " ").trim();
const dataAttr = firstDataAttribute(el);
if (dataAttr) return dataAttr.replace(/^data-/, "").replace(/[-_]+/g, " ").trim();
return "Block";
}
/** Elements considered candidates, same set the extractor's scorer walks. */
function candidateElements(): Element[] {
const els: Element[] = [];
for (const selector of ["main", "[role=main]", "article"]) {
const el = document.querySelector(selector);
if (el) els.push(el);
}
if (document.body) {
for (const el of Array.from(document.body.querySelectorAll("*"))) els.push(el);
}
return els;
}
function rankCandidates(): { el: Element; text: string; score: number }[] {
const scored: { el: Element; text: string; score: number }[] = [];
const seen = new Set<Element>();
for (const el of candidateElements()) {
if (seen.has(el)) continue;
seen.add(el);
const evaluated = scoreCandidate(el);
if (evaluated) scored.push({ el, ...evaluated });
}
scored.sort((a, b) => b.score - a.score);
// Dedupe near-identical nested wrappers (a <div> whose only child is the
// real candidate scores almost the same and would otherwise double the
// list with no new information for the user, spec FR-024b).
const kept: { el: Element; text: string; score: number }[] = [];
for (const candidate of scored) {
const isNearDuplicate = kept.some((k) => {
const related = k.el.contains(candidate.el) || candidate.el.contains(k.el);
if (!related) return false;
const ratio = candidate.text.length / Math.max(1, k.text.length);
return ratio > 0.85 && ratio < 1.15;
});
if (!isNearDuplicate) kept.push(candidate);
if (kept.length >= MAX_CANDIDATES) break;
}
return kept;
}
function listCandidates(): PickerCandidate[] {
return rankCandidates().map(({ el, text }) => ({
selector: selectorPath(el),
label: labelFor(el),
textLength: text.length,
excerpt: excerptOf(text),
}));
}
// Removes only the highlight styling/badge — called on every hover or
// arrow-key move to swap the highlighted candidate. It must NOT touch
// scroll position or the stored-origin flag below, or repeated moves would
// each capture a new "original" and FR-025's restore-on-dismiss would
// restore to the wrong place.
function clearHighlightVisuals(): void {
for (const el of Array.from(document.querySelectorAll(`[${HIGHLIGHT_ATTR}]`))) {
(el as HTMLElement).style.outline = "";
(el as HTMLElement).style.outlineOffset = "";
(el as HTMLElement).style.boxShadow = "";
el.removeAttribute(HIGHLIGHT_ATTR);
}
document.getElementById(CURSOR_BADGE_ID)?.remove();
document.body.style.cursor = "";
}
// Captures the CURRENT scroll position as the one FR-025 restores to on
// dismissal — but only if a session hasn't already captured one, so
// repeated calls during one session (one per hovered/highlighted
// candidate) never overwrite it with an already-scrolled position.
function rememberOriginalScroll(): void {
const globalScope = window as unknown as Record<string, unknown>;
if (globalScope.__jpaPickerOriginalScroll === undefined) {
globalScope.__jpaPickerOriginalScroll = { x: window.scrollX, y: window.scrollY };
}
}
// Explicit session boundary: forces a fresh capture even if a PRIOR
// session left one behind without going through clearHighlight (e.g. the
// panel was closed without Escape/commit while the page never navigated,
// so this page context — and any leftover flag — survived). Called once
// by the caller when scoping actually begins, before the first highlight
// or the pointer picker starts.
function beginSession(): void {
clearHighlightVisuals();
const globalScope = window as unknown as Record<string, unknown>;
delete globalScope.__jpaPickerOriginalScroll;
rememberOriginalScroll();
}
// The actual "dismiss without side effects" endpoint (FR-025, T101):
// visuals gone AND scroll restored to what it was when scoping started.
function clearHighlight(): void {
clearHighlightVisuals();
const globalScope = window as unknown as Record<string, unknown>;
const stored = globalScope.__jpaPickerOriginalScroll as { x: number; y: number } | undefined;
if (stored) {
window.scrollTo(stored.x, stored.y);
delete globalScope.__jpaPickerOriginalScroll;
}
}
// FR-024c: perceivable without relying on color alone (a shape/outline
// change, not a color shift) and 3:1 against arbitrary page content —
// achieved with a white+blue double ring via boxShadow rather than a flat
// color, since a flat color chosen once cannot stay contrasty against
// unknown page backgrounds.
function applyHighlight(el: Element): void {
clearHighlightVisuals();
const node = el as HTMLElement;
node.style.outline = "3px solid #2563eb";
node.style.outlineOffset = "2px";
node.style.boxShadow = "0 0 0 2px #ffffff, 0 0 0 5px #2563eb";
node.setAttribute(HIGHLIGHT_ATTR, "true");
}
function highlightBySelector(selector: string): void {
rememberOriginalScroll();
const el = document.querySelector(selector);
if (!el) return;
applyHighlight(el);
el.scrollIntoView({ block: "center", behavior: "smooth" });
}
// FR-024b's stale-list edge case (spec Edge Cases): the list was built at
// some earlier moment, so re-resolve at commit time rather than trust it.
function resolveText(selector: string): CommitOutcome {
const el = document.querySelector(selector);
if (!el) {
return { ok: false, reason: "This region is no longer on the page. Choose another one from the list." };
}
const text = textOf(el);
if (text.length < 200) {
return { ok: false, reason: "This region is no longer on the page. Choose another one from the list." };
}
return { ok: true, text };
}
// FR-024/FR-024c/FR-025/T100/T101: pointer path. Highlights the block
// under the cursor with its live character count, commits on click
// (re-resolving the node at click time per the same re-render edge case),
// and on Escape restores scroll, cursor, and highlight styling exactly as
// found — "dismissible without side effects."
function pointerPick(): Promise<PointerPickOutcome> {
return new Promise((resolve) => {
beginSession();
document.body.style.cursor = "crosshair";
function blockUnder(x: number, y: number): Element | null {
let node = document.elementFromPoint(x, y);
while (node && node !== document.body) {
if (textOf(node).length >= CANDIDATE_MIN_CHARS || node.parentElement === document.body) {
return node;
}
node = node.parentElement;
}
return node;
}
function showBadge(x: number, y: number, length: number): void {
let badge = document.getElementById(CURSOR_BADGE_ID);
if (!badge) {
badge = document.createElement("div");
badge.id = CURSOR_BADGE_ID;
badge.style.position = "fixed";
badge.style.zIndex = "2147483647";
badge.style.pointerEvents = "none";
badge.style.background = "#111827";
badge.style.color = "#ffffff";
badge.style.font = "11px sans-serif";
badge.style.padding = "2px 6px";
badge.style.borderRadius = "4px";
document.body.appendChild(badge);
}
badge.textContent = `${length.toLocaleString()} chars`;
badge.style.left = `${x + 12}px`;
badge.style.top = `${y + 12}px`;
}
const onMouseMove = (e: MouseEvent): void => {
const target = blockUnder(e.clientX, e.clientY);
if (target) {
applyHighlight(target);
showBadge(e.clientX, e.clientY, textOf(target).length);
}
};
// A successful commit clears the highlight but leaves scroll where the
// user clicked — FR-025's restore-on-dismiss applies to abandoning
// selection, not to completing it. Escape and "nothing found" ARE
// dismissals, so both restore scroll via the full clearHighlight().
// Also drops the cross-invocation cancel handle below: once this
// promise is settling, an external "cancelPointerPick" call from a
// LATER, separate executeScript invocation must no longer reach in.
const cleanup = (restoreScroll: boolean): void => {
document.removeEventListener("mousemove", onMouseMove, true);
document.removeEventListener("click", onClick, true);
document.removeEventListener("keydown", onKeyDown, true);
if (restoreScroll) clearHighlight();
else clearHighlightVisuals();
delete (window as unknown as Record<string, unknown>).__jpaPickerCancelPointerPick;
};
const onClick = (e: MouseEvent): void => {
e.preventDefault();
e.stopPropagation();
const target = blockUnder(e.clientX, e.clientY);
if (!target) {
cleanup(true);
resolve({ ok: false, reason: "No region was found at that point." });
return;
}
const text = textOf(target);
const selector = selectorPath(target);
cleanup(false);
resolve({ ok: true, text, selector });
};
const dismiss = (): void => {
cleanup(true);
resolve({ ok: false, reason: "dismissed" });
};
const onKeyDown = (e: KeyboardEvent): void => {
if (e.key !== "Escape") return;
dismiss();
};
// Each executeScript call is a fresh invocation with its OWN closure —
// a later "cancelPointerPick" call cannot reach this promise's resolve
// directly. Stashing `dismiss` on `window` (the one thing that DOES
// persist across separate injections into the same page, same
// technique the remembered-scroll flag above uses) is what lets the
// panel cancel an in-flight pointer session without the user having
// pressed Escape on the page itself — e.g. clicking "Use the list
// instead" or "Cancel" back in the panel.
(window as unknown as Record<string, unknown>).__jpaPickerCancelPointerPick = dismiss;
document.addEventListener("mousemove", onMouseMove, true);
document.addEventListener("click", onClick, true);
document.addEventListener("keydown", onKeyDown, true);
});
}
function cancelPointerPick(): void {
const globalScope = window as unknown as Record<string, unknown>;
const dismiss = globalScope.__jpaPickerCancelPointerPick as (() => void) | undefined;
dismiss?.();
}
switch (command.type) {
case "beginSession":
beginSession();
return { kind: "void" };
case "list":
return { kind: "candidates", candidates: listCandidates() };
case "highlight":
highlightBySelector(command.selector);
return { kind: "void" };
case "clearHighlight":
clearHighlight();
return { kind: "void" };
case "resolveText":
return { kind: "commit", outcome: resolveText(command.selector) };
case "pointerPick":
return { kind: "pointerPick", outcome: await pointerPick() };
case "cancelPointerPick":
cancelPointerPick();
return { kind: "void" };
default:
return { kind: "void" };
}
}
/**
* Marks the start of a scoping session — called once by the panel before
* the first candidate is listed/highlighted or the pointer picker starts.
* Forces a fresh scroll-origin capture even if a prior session on this same
* page left one behind without an explicit dismiss (see `beginSession`'s
* in-page comment).
*/
async function beginSession(tabId: number): Promise<void> {
try {
await chrome.scripting.executeScript({
target: { tabId },
func: pickerPageScript,
args: [{ type: "beginSession" }],
});
} catch {
// Best-effort — worst case a later dismiss restores to a slightly
// stale position, which is cosmetic.
}
}
async function listCandidates(tabId: number): Promise<PickerCandidate[]> {
try {
const [injection] = await chrome.scripting.executeScript({
target: { tabId },
func: pickerPageScript,
args: [{ type: "list" }],
});
const result = injection?.result as PickerPageResult | undefined;
return result?.kind === "candidates" ? result.candidates : [];
} catch {
return [];
}
}
async function highlightCandidate(tabId: number, selector: string): Promise<void> {
try {
await chrome.scripting.executeScript({
target: { tabId },
func: pickerPageScript,
args: [{ type: "highlight", selector }],
});
} catch {
// Best-effort visual supplement (FR-024b) — a screen-reader user does
// not depend on it, so a failure here is silent.
}
}
async function clearPickerHighlight(tabId: number): Promise<void> {
try {
await chrome.scripting.executeScript({
target: { tabId },
func: pickerPageScript,
args: [{ type: "clearHighlight" }],
});
} catch {
// Page may already be gone (navigation) — nothing to restore.
}
}
async function resolveCandidateText(tabId: number, selector: string): Promise<CommitOutcome> {
try {
const [injection] = await chrome.scripting.executeScript({
target: { tabId },
func: pickerPageScript,
args: [{ type: "resolveText", selector }],
});
const result = injection?.result as PickerPageResult | undefined;
if (result?.kind === "commit") return result.outcome;
return { ok: false, reason: "This region is no longer on the page. Choose another one from the list." };
} catch {
return { ok: false, reason: "This region is no longer on the page. Choose another one from the list." };
}
}
async function startPointerPick(tabId: number): Promise<PointerPickOutcome> {
try {
const [injection] = await chrome.scripting.executeScript({
target: { tabId },
func: pickerPageScript,
args: [{ type: "pointerPick" }],
});
const result = injection?.result as PickerPageResult | undefined;
if (result?.kind === "pointerPick") return result.outcome;
return { ok: false, reason: "dismissed" };
} catch {
return { ok: false, reason: "dismissed" };
}
}
/**
* Cancels an in-flight `startPointerPick` from OUTSIDE the page — e.g. the
* panel's own "Cancel"/"Use the list instead" controls, where no Escape
* keydown ever reaches the page. A separate executeScript call reaching the
* still-pending one via the `window`-stashed handle in `pointerPick` (see
* its in-page comment) — without this, that promise would never resolve and
* the page would be left in crosshair mode with live listeners forever.
*/
async function cancelPointerPick(tabId: number): Promise<void> {
try {
await chrome.scripting.executeScript({
target: { tabId },
func: pickerPageScript,
args: [{ type: "cancelPointerPick" }],
});
} catch {
// Page may already be gone (navigation) — the pending promise, if any,
// died with it.
}
}
export const pickerService = {
beginSession,
listCandidates,
highlightCandidate,
clearPickerHighlight,
resolveCandidateText,
startPointerPick,
cancelPointerPick,
};
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