import type { PdfPageContent } from '../../models/PdfPageContent.js';
export type ContentType = 'cover' | 'image' | 'article' | 'mixed';
export interface ContinuationMarkers {
    toPage: number | null;
    fromPage: number | null;
}
/**
 * The current page's main body ends mid-sentence, i.e. it looks like a clause cut
 * across the page break. Two conditions must both hold:
 *  - no terminal sentence punctuation, AND
 *  - the tail ends on a word or comma (a clause genuinely running on).
 * A tail that ends on a separator / number / symbol is NOT a hanging sentence:
 * ad legal fine print ("... | Chromos | -"), a stat callout, or a caption fragment
 * would otherwise read as "hanging" and wrongly glue an ad or a standalone page
 * onto its neighbour.
 */
export declare function mainBodyEndsHanging(page: PdfPageContent): boolean;
/** The next page begins mid-sentence: its first text element is body starting lowercase. */
export declare function nextStartsMidSentence(page: PdfPageContent): boolean;
/** The page opens a new section/article (large display title or a section-marker word). */
export declare function startsNewSection(page: PdfPageContent): boolean;
/**
 * The next page's first body paragraph opens with a discourse connective
 * ("Meanwhile, ..."): continuation evidence even when the previous page ended
 * on a sentence boundary.
 */
export declare function nextStartsWithConnective(page: PdfPageContent): boolean;
/**
 * Distinct normalized tokens of the page's running head / kicker (stashed by
 * the clean composer in metadata.runningHeadText before the margin filter
 * discards those elements). "BUSINESS stable fly" -> [business, stable, fly].
 */
export declare function runningHeadTokens(page: PdfPageContent): string[];
/**
 * Parse "continued on/from page N" markers from a page's text.
 */
export declare function parseContinuationMarkers(page: PdfPageContent): ContinuationMarkers;
/**
 * The two pages are the left and right halves of the SAME physical spread page
 * (adjacent by construction: the splitter emits left then right).
 */
export declare function isSpreadMatePair(currentPage: PdfPageContent, nextPage: PdfPageContent): boolean;
/**
 * An "artwork half": a spread half whose content is imagery belonging to its
 * mate's article, not an article of its own. Evidence: it has image content,
 * no article opening of its own, and at most caption-level text in few boxes
 * (ads scatter promo copy across 5+ boxes; editorial artwork carries 0-3).
 * For halves already collapsed to a screenshot, the collapse reason separates
 * editorial artwork (single-large-image / tiled-images / cover) from ads.
 */
export declare function isSpreadArtworkHalf(page: PdfPageContent): boolean;
/**
 * Spread-mate attachment: exactly one half is artwork and the other carries
 * the article text. Direction-agnostic (artwork may sit left or right).
 * Evaluated BEFORE the screenshot guard in hasContentContinuity: within a
 * spread, a full-page editorial image belongs to its mate's article, unlike a
 * portrait document where an image-only page is a standalone ad/insert.
 */
export declare function spreadMateContinuity(currentPage: PdfPageContent, nextPage: PdfPageContent): boolean;
/**
 * A page that has been (or should be) collapsed to a single full-page screenshot
 * is standalone and must never merge with a neighbour. Primary signal is the
 * metadata the screenshot stage writes; the structural fallback covers ads that
 * the per-document screenshot cap left un-converted.
 */
export declare function isScreenshotPage(page: PdfPageContent): boolean;
export declare function isCoverPage(page: PdfPageContent): boolean;
export declare function analyzeContentType(page: PdfPageContent): ContentType;
/**
 * Decide whether content flows continuously from currentPage into nextPage.
 *
 * `sharedRunningHead` is document-level evidence the caller computes (see
 * PdfPageComposer): both pages carry the same RARE running-head kicker (an
 * article subject line such as "stable fly", not a section label). It covers
 * continuations whose pages each end on a clean sentence boundary, which the
 * text-flow signals below cannot see.
 */
export declare function hasContentContinuity(currentPage: PdfPageContent, nextPage: PdfPageContent, sharedRunningHead?: boolean): boolean;
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