feat: add HTML table reader and date parsing
Every date function returns null rather than inferring a missing year, month or end date. A source that does not state an end yields endsAt: null, never a plausible guess — a confidently wrong end date is the failure this product exists to prevent. Handles the three formats seen on Game8: "August 12, 2026", "August 12 - September 21, 2026" (year applies to both ends, rolling the start back when the range crosses New Year), and a slash datetime range. Abbreviated months parse too, so a source switching to "Apr. 29" does not silently drop events. Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
This commit is contained in:
Lucas Winther
co-authored by
Claude Opus 5
Claude Opus 5
parent
e8293c7e8c
commit
caefe6b0d7
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/**
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* Deterministic date parsing for adapter sources.
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*
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* Every function here returns null rather than guessing. A source that does not
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* state a year, a month, or an end does not get one invented — see
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* docs/PRD.md § Quality bar. Returning null is a correct outcome.
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*/
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import type { Precision } from "../shared/schema.ts";
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export interface ParsedInstant {
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/** UTC ISO 8601. */
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iso: string;
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precision: Extract<Precision, "exact" | "day">;
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}
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const MONTHS: Record<string, number> = {
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january: 1, february: 2, march: 3, april: 4, may: 5, june: 6,
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july: 7, august: 8, september: 9, october: 10, november: 11, december: 12,
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// Game8 abbreviates in some tables ("Apr. 29 - May 13, 2026"). Without these
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// such rows parse as null and the events vanish silently, which is a worse
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// failure than a wrong date because nothing surfaces it.
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jan: 1, feb: 2, mar: 3, apr: 4, jun: 6, jul: 7,
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aug: 8, sep: 9, sept: 9, oct: 10, nov: 11, dec: 12,
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};
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function monthNumber(name: string): number | null {
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return MONTHS[name.toLowerCase().replace(/\.$/, "")] ?? null;
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}
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function iso(
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y: number,
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m: number,
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d: number,
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hh = 0,
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mm = 0,
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): string | null {
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if (m < 1 || m > 12 || d < 1 || d > 31 || hh > 23 || mm > 59) return null;
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const date = new Date(Date.UTC(y, m - 1, d, hh, mm, 0, 0));
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// Rejects impossible calendar dates such as February 30.
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if (date.getUTCMonth() !== m - 1 || date.getUTCDate() !== d) return null;
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return date.toISOString();
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}
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/** "August 12, 2026" → 2026-08-12T00:00:00.000Z, day precision. */
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export function parseMonthDayYear(input: string): ParsedInstant | null {
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const m = /([A-Za-z]+)\.?\s+(\d{1,2}),\s*(\d{4})/.exec(input);
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if (!m) return null;
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const month = monthNumber(m[1] ?? "");
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if (month === null) return null;
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const value = iso(Number(m[3]), month, Number(m[2]));
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return value === null ? null : { iso: value, precision: "day" };
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}
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/**
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* "August 12 - September 21, 2026" → both instants, year taken from the end.
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* A range whose end carries no year is unresolvable and returns null.
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*/
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export function parseMonthDayRange(
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input: string,
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): { start: ParsedInstant; end: ParsedInstant } | null {
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const m =
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/([A-Za-z]+)\.?\s+(\d{1,2})\s*[-–—]\s*([A-Za-z]+)\.?\s+(\d{1,2}),\s*(\d{4})/.exec(
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input,
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);
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if (!m) return null;
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const startMonth = monthNumber(m[1] ?? "");
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const endMonth = monthNumber(m[3] ?? "");
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if (startMonth === null || endMonth === null) return null;
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const year = Number(m[5]);
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// A range that crosses New Year renders as "December 28 - January 4, 2027",
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// where the stated year belongs to the end. Roll the start back a year.
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const startYear = startMonth > endMonth ? year - 1 : year;
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const startIso = iso(startYear, startMonth, Number(m[2]));
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const endIso = iso(year, endMonth, Number(m[4]));
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if (startIso === null || endIso === null) return null;
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return {
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start: { iso: startIso, precision: "day" },
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end: { iso: endIso, precision: "day" },
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};
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}
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/**
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* "2021/01/16 04:00 - 2021/01/31 03:59" → both instants, exact precision.
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* Trailing prose after the range (e.g. "Currently Unavailable") is ignored.
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*
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* NOTE: the source states a wall-clock time but not a timezone. These are read
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* as UTC. See the timezone caveat in the Genshin adapter.
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*/
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export function parseSlashDateTimeRange(
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input: string,
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): { start: ParsedInstant; end: ParsedInstant } | null {
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const re =
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/(\d{4})\/(\d{1,2})\/(\d{1,2})\s+(\d{1,2}):(\d{2})\s*[-–—]\s*(\d{4})\/(\d{1,2})\/(\d{1,2})\s+(\d{1,2}):(\d{2})/;
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const m = re.exec(input);
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if (!m) return null;
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const n = (i: number) => Number(m[i]);
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const startIso = iso(n(1), n(2), n(3), n(4), n(5));
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const endIso = iso(n(6), n(7), n(8), n(9), n(10));
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if (startIso === null || endIso === null) return null;
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return {
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start: { iso: startIso, precision: "exact" },
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end: { iso: endIso, precision: "exact" },
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};
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}
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@@ -0,0 +1,121 @@
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/**
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* Minimal, dependency-free HTML reading for adapters.
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*
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* Deliberately not a general HTML parser. It handles the one shape adapters
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* need — a linear walk of headings and flat tables — and is only safe because
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* adapters assert their fixtures have no nested tables. If a source ever needs
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* more than this, use Bun's built-in HTMLRewriter rather than growing regexes.
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*/
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const ENTITIES: Record<string, string> = {
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amp: "&",
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lt: "<",
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gt: ">",
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quot: '"',
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apos: "'",
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nbsp: " ",
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ndash: "–",
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mdash: "—",
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hellip: "…",
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rsquo: "’",
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lsquo: "‘",
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ldquo: "“",
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rdquo: "”",
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};
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export function decodeEntities(input: string): string {
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return input
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.replace(/&#x([0-9a-fA-F]+);/g, (_, hex: string) =>
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String.fromCodePoint(parseInt(hex, 16)),
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)
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.replace(/&#(\d+);/g, (_, dec: string) =>
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String.fromCodePoint(parseInt(dec, 10)),
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)
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.replace(/&([a-zA-Z]+);/g, (whole, name: string) => ENTITIES[name] ?? whole);
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}
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/** Strip tags, decode entities, collapse whitespace. */
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export function text(html: string): string {
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return decodeEntities(html.replace(/<[^>]*>/g, " "))
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.replace(/\s+/g, " ")
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.trim();
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}
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export interface TableNode {
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kind: "table";
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/** Every <th> → next-sibling <td> pair, text-only. Empty for column tables. */
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pairs: Array<{ label: string; value: string }>;
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/** All <th> texts, in order — lets a caller recognise a header-row table. */
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headers: string[];
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/** Every <tr> as its cell texts, header row included. For column tables. */
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rows: string[][];
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}
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export type DocNode =
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| { kind: "h2"; text: string }
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| { kind: "h3"; text: string }
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| TableNode;
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/**
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* Walk a document in source order, yielding h2/h3 headings and tables.
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*
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* Pure: no network, no clock. Given identical input it always yields identical
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* output, which is what makes fixture tests meaningful.
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*/
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export function scanDocument(rawHtml: string): DocNode[] {
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const html = rawHtml.replace(/<!--[\s\S]*?-->/g, "").replace(/\s+/g, " ");
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const nodes: DocNode[] = [];
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const re = /<h2\b[^>]*>([\s\S]*?)<\/h2>|<h3\b[^>]*>([\s\S]*?)<\/h3>|<table\b[^>]*>([\s\S]*?)<\/table>/gi;
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for (const m of html.matchAll(re)) {
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const [, h2, h3, table] = m;
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if (h2 !== undefined) {
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nodes.push({ kind: "h2", text: text(h2) });
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} else if (h3 !== undefined) {
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nodes.push({ kind: "h3", text: text(h3) });
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} else if (table !== undefined) {
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nodes.push(readTable(table));
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}
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}
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return nodes;
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}
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function readTable(body: string): TableNode {
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const headers: string[] = [];
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for (const m of body.matchAll(/<th\b[^>]*>([\s\S]*?)<\/th>/gi)) {
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headers.push(text(m[1] ?? ""));
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}
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// Label/value rows: a <th> immediately followed by a <td>.
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const pairs: Array<{ label: string; value: string }> = [];
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const pairRe = /<th\b[^>]*>([\s\S]*?)<\/th>\s*<td\b[^>]*>([\s\S]*?)<\/td>/gi;
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for (const m of body.matchAll(pairRe)) {
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pairs.push({ label: text(m[1] ?? ""), value: text(m[2] ?? "") });
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}
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// Row/cell grid, for column-oriented tables.
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const rows: string[][] = [];
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for (const tr of body.matchAll(/<tr\b[^>]*>([\s\S]*?)<\/tr>/gi)) {
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const cells: string[] = [];
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for (const cell of (tr[1] ?? "").matchAll(
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/<t([dh])\b[^>]*>([\s\S]*?)<\/t\1>/gi,
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)) {
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cells.push(text(cell[2] ?? ""));
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}
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if (cells.length > 0) rows.push(cells);
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}
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return { kind: "table", pairs, headers, rows };
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}
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/** True when the document contains no nested <table> elements. */
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export function assertFlatTables(rawHtml: string): boolean {
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let depth = 0;
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for (const m of rawHtml.matchAll(/<table\b[^>]*>|<\/table>/gi)) {
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depth += m[0].startsWith("</") ? -1 : 1;
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if (depth > 1) return false;
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}
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return depth === 0;
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}
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