progfay/scrapbox-parser

import type { ParserOption } from "../parse.ts";
import type { CodeBlockPack } from "./CodeBlock.ts";
import type { LinePack } from "./Line.ts";
import type { Row } from "./Row.ts";
import type { TablePack } from "./Table.ts";
import type { TitlePack } from "./Title.ts";

export type Pack = TitlePack | CodeBlockPack | TablePack | LinePack;

const isChildRowOfPack = (pack: Pack, row: Row): boolean =>
    (pack.type === "codeBlock" || pack.type === "table") &&
    row.indent > (pack.rows[0]?.indent ?? 0);

const packing = (packs: Pack[], row: Row): Pack[] => {
    const lastPack = packs[packs.length - 1];
    if (lastPack !== undefined && isChildRowOfPack(lastPack, row)) {
        lastPack.rows.push(row);
        return packs;
    }

    packs.push({
        type: /^\s*code:/.test(row.text)
            ? "codeBlock"
            : /^\s*table:/.test(row.text)
                ? "table"
                : "line",
        rows: [row],
    });

    return packs;
};

export const packRows = (rows: Row[], opts: ParserOption): Pack[] => {
    if (opts.hasTitle ?? true) {
        const [title, ...body] = rows;
        if (title === undefined) return [];
        return [
            {
                type: "title",
                rows: [title],
            },
            ...body.reduce(packing, []),
        ];
    }

    return rows.reduce(packing, []);
};