Press n or j to go to the next uncovered block, b, p or k for the previous block.
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* @module generate-news-indexes/helpers
* @description Utility functions for article metadata parsing, topic/type
* classification, news directory scanning, and cross-language discovery.
*
* @author Hack23 AB
* @license Apache-2.0
*/
import fs from 'fs';
import path from 'path';
import { fileURLToPath } from 'url';
import type {
LanguageConfig,
NewsArticleMetadata,
ArticleTypeValue,
} from './types.js';
import { LANGUAGES, LANGUAGE_FLAGS, AVAILABLE_IN_TRANSLATIONS } from './constants.js';
import { decodeHtmlEntities } from '../html-utils.js';
const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);
/** Root news directory */
export const NEWS_DIR: string = path.join(__dirname, '..', '..', 'news');
const TOPIC_INFERENCE_PATTERNS: ReadonlyArray<readonly [string, RegExp]> = [
['committees', /(committee|committeereports|utskott|betänkande|committee reports|rapport de commission|ausschuss|위원회|委员会|委員会)/i],
['legislation', /(proposition|motion|bill|legislative|lagstift|lovgiv|lainsäädäntö|gesetz|législation|legislación|立法|입법)/i],
['parliament', /(interpellation|riksdag|parliament|riksdagen|parlament|val\b|election|voting|vote|议会|의회|議会)/i],
['government', /(government|regering|regerings|minister|ministry|kristersson|gouvernement|gobierno|regierung|الحكومة|ממשלה|政府)/i],
['defense', /(defen[cs]e|försvar|forsvar|puolustus|verteidigung|défense|defensa|defensie|国防|防衛|국방)/i],
['environment', /(environment|climate|miljö|miljø|ympäristö|umwelt|environnement|medio ambiente|milieu|环境|環境|환경)/i],
['eu', /(eu|european union|europeiska unionen|union européenne|europäische union)/i],
] as const;
/**
* Generate language badge HTML for an article.
*/
export function generateLanguageBadge(lang: string, isRTL: boolean = false): string {
const flag: string = LANGUAGE_FLAGS[lang] || '🌐';
const langUpper: string = lang.toUpperCase();
const dirAttr: string = isRTL ? ' dir="ltr"' : '';
return `<span class="language-badge"${dirAttr} aria-label="${(LANGUAGES as Record<string, LanguageConfig>)[lang]?.name || lang} language"><span aria-hidden="true">${flag}</span> ${langUpper}</span>`;
}
/**
* Generate language switcher navigation for news index pages.
*/
export function generateLanguageSwitcherNav(currentLang: string): string {
const langEntries: [string, LanguageConfig][] = Object.entries(LANGUAGES);
const links: string = langEntries.map(([code, data]) => {
const flag: string = LANGUAGE_FLAGS[code] || '🌐';
const filename: string = code === 'en' ? 'index.html' : `index_${code}.html`;
const activeClass: string = code === currentLang ? ' active' : '';
// Norwegian files use filename suffix 'no' but must be advertised as 'nb' per BCP-47.
const bcp47: string = code === 'no' ? 'nb' : code;
// `lang=` ensures screen-readers pronounce the native language name
// using the correct voice, independent of the page's <html lang>.
return ` <a href="${filename}" class="lang-link${activeClass}" hreflang="${bcp47}" lang="${bcp47}">${flag} ${data.name}</a>`;
}).join('\n');
return `<nav class="language-switcher" role="navigation" aria-label="Language selection">\n${links}\n</nav>`;
}
/**
* Generate "Available in" text with language badges.
*/
export function generateAvailableLanguages(languages: string[], currentLang: string): string {
if (!languages || languages.length <= 1) return '';
const isRTL: boolean = ['ar', 'he'].includes(currentLang);
const availableText: string = AVAILABLE_IN_TRANSLATIONS[currentLang] || 'Available in';
const badges: string = languages.map((lang) => generateLanguageBadge(lang, isRTL)).join(' ');
return `<p class="available-languages"><strong>${availableText}:</strong> ${badges}</p>`;
}
/**
* Extract the JSON-LD `description` field from a NewsArticle blob
* embedded in the article HTML. Returns `null` when the script tag is
* missing, malformed, or has no description. Used as a tertiary fallback
* for `parseArticleMetadata` / `extractArticleMeta`, after `og:description`
* and `<meta name="description">`.
*
* Implements `seo-metadata-contract.md` §3.h.
*/
export function extractDescriptionFromJSONLD(html: string): string | null {
try {
const jsonLdMatch = html.match(/<script type="application\/ld\+json">([\s\S]*?)<\/script>/i);
if (!jsonLdMatch) return null;
const jsonData = JSON.parse(jsonLdMatch[1]!.trim()) as { description?: string };
const desc = typeof jsonData.description === 'string' ? jsonData.description.trim() : '';
return desc.length > 0 ? desc : null;
} catch {
return null;
}
}
/**
* Strip a trailing ` — Riksdagsmonitor` / ` | Riksdagsmonitor` brand
* suffix from a title so sitemap / news-index cards render the editorial
* headline alone. The brand is re-added by the card template.
*
* Implements `seo-metadata-contract.md` §3.h.
*/
export function stripBrandSuffix(title: string): string {
return title.replace(/\s*[—\-|]\s*Riksdagsmonitor\s*$/i, '').trim();
}
/**
* Choose the richest available description from three candidate sources,
* preferring whichever is longest but non-empty. Falls back in order:
* 1. `og:description` (often the richest, emitted by the aggregator)
* 2. `<meta name="description">` (truncated legacy copy)
* 3. JSON-LD `description` (last resort)
*
* Implements `seo-metadata-contract.md` §3.h.
*/
export function chooseBestDescription(
ogDescription: string | null,
metaDescription: string | null,
jsonLdDescription: string | null,
): string {
const candidates = [ogDescription, metaDescription, jsonLdDescription]
.map((s) => (s ?? '').trim())
.filter((s) => s.length > 0);
if (candidates.length === 0) return '';
candidates.sort((a, b) => b.length - a.length);
return candidates[0]!;
}
/**
* Parse HTML file to extract article metadata.
*/
export function parseArticleMetadata(filePath: string): NewsArticleMetadata | null {
try {
const content: string = fs.readFileSync(filePath, 'utf-8');
const fileName: string = path.basename(filePath);
// Extract language from filename (e.g., article-en.html → en, article-da.html → da)
const langMatch: RegExpMatchArray | null = fileName.match(/-(en|sv|da|no|fi|de|fr|es|nl|ar|he|ja|ko|zh)\.html$/);
if (!langMatch) {
console.warn(` ⚠️ Skipping ${fileName}: no language suffix`);
return null;
}
const lang: string = langMatch[1]!;
// Extract metadata from HTML meta tags
// Decode HTML entities to UTF-8 to prevent double-escaping in index pages
const rawTitle =
extractMetaContent(content, 'og:title') ||
extractTitle(content) ||
'Untitled';
const description = chooseBestDescription(
extractMetaContent(content, 'og:description'),
extractMetaContent(content, 'description'),
extractDescriptionFromJSONLD(content),
);
const topics = extractTopics(content, fileName);
const metadata: NewsArticleMetadata = {
slug: fileName,
lang,
title: stripBrandSuffix(decodeHtmlEntities(rawTitle)),
description: decodeHtmlEntities(description),
date: normalizeDateString(
extractMetaContent(content, 'article:published_time') ||
extractMetaContent(content, 'date') ||
extractDateFromJSONLD(content) ||
extractFromFilename(fileName),
),
type: classifyArticleType(content, fileName),
topics,
tags: decodeHtmlEntities(extractTags(content, fileName, topics).join('|||')).split('|||').filter(Boolean),
};
return metadata;
} catch (error: unknown) {
console.error(` ❌ Error parsing ${path.basename(filePath)}:`, (error as Error).message);
return null;
}
}
/**
* Extract content from meta tags.
*
* Fixed: regex now properly handles apostrophes and special characters in content.
*/
export function extractMetaContent(html: string, property: string): string | null {
// Match double-quoted attributes
const doubleQuotePattern = new RegExp(`<meta\\s+(?:property|name)="${property}"\\s+content="([^"]+)"`, 'i');
const doubleQuoteMatch: RegExpMatchArray | null = html.match(doubleQuotePattern);
if (doubleQuoteMatch) return doubleQuoteMatch[1]!;
// Match single-quoted attributes
const singleQuotePattern = new RegExp(`<meta\\s+(?:property|name)='${property}'\\s+content='([^']+)'`, 'i');
const singleQuoteMatch: RegExpMatchArray | null = html.match(singleQuotePattern);
Iif (singleQuoteMatch) return singleQuoteMatch[1]!;
// Try reversed order (content before property/name)
const reversedDoublePattern = new RegExp(`<meta\\s+content="([^"]+)"\\s+(?:property|name)="${property}"`, 'i');
const reversedDoubleMatch: RegExpMatchArray | null = html.match(reversedDoublePattern);
Iif (reversedDoubleMatch) return reversedDoubleMatch[1]!;
const reversedSinglePattern = new RegExp(`<meta\\s+content='([^']+)'\\s+(?:property|name)='${property}'`, 'i');
const reversedSingleMatch: RegExpMatchArray | null = html.match(reversedSinglePattern);
Iif (reversedSingleMatch) return reversedSingleMatch[1]!;
return null;
}
/**
* Extract title from <title> tag.
*/
export function extractTitle(html: string): string | null {
const match: RegExpMatchArray | null = html.match(/<title>([^<]+)<\/title>/i);
return match ? match[1]!.replace(' - Riksdagsmonitor', '').trim() : null;
}
/**
* Normalize date string to YYYY-MM-DD format.
*/
export function normalizeDateString(dateStr: string | null): string {
Iif (!dateStr) return new Date().toISOString().split('T')[0]!;
// If already in YYYY-MM-DD format, return as-is
if (/^\d{4}-\d{2}-\d{2}$/.test(dateStr)) {
return dateStr;
}
// If ISO timestamp (with time), extract just the date part
Eif (dateStr.includes('T')) {
return dateStr.split('T')[0]!;
}
// If has timezone offset like +01:00, remove it first
const cleaned: string = dateStr.replace(/[+-]\d{2}:\d{2}$/, '');
if (cleaned.includes('T')) {
return cleaned.split('T')[0]!;
}
return dateStr;
}
/**
* Extract date from JSON-LD structured data.
*/
export function extractDateFromJSONLD(html: string): string | null {
try {
// Extract JSON-LD script tag content
const jsonLdMatch: RegExpMatchArray | null = html.match(/<script type="application\/ld\+json">([\s\S]*?)<\/script>/i);
if (!jsonLdMatch) return null;
const jsonLdText: string = jsonLdMatch[1]!.trim();
const jsonData: { datePublished?: string } = JSON.parse(jsonLdText) as { datePublished?: string };
// Extract datePublished from NewsArticle schema
Eif (jsonData.datePublished) {
const dateStr: string = jsonData.datePublished.split('T')[0]!;
return dateStr;
}
return null;
} catch {
// Silently fail - this is a fallback mechanism
return null;
}
}
/**
* Extract date from filename (YYYY-MM-DD format).
*/
export function extractFromFilename(fileName: string): string {
const match: RegExpMatchArray | null = fileName.match(/^(\d{4}-\d{2}-\d{2})/);
return match ? match[1]! : new Date().toISOString().split('T')[0]!;
}
/**
* Classify article type based on content and filename.
* Supports detection keywords in all 14 languages.
*/
export function classifyArticleType(content: string, fileName: string): ArticleTypeValue {
const lowerContent: string = content.toLowerCase();
// Prospective: week-ahead / upcoming previews
const prospectiveKeywords: string[] = [
'week ahead', 'week-ahead', 'upcoming', 'preview', 'look ahead', // en
'veckan som kommer', 'kommande vecka', 'framåtblick', // sv
'ugen der kommer', 'kommende uge', 'fremadrettet', // da
'uken som kommer', 'fremtidsrettet', // no
'tuleva viikko', 'ennakko', // fi
'woche voraus', 'vorschau', // de
'semaine à venir', 'aperçu', // fr
'semana por delante', 'adelanto', // es
'week vooruit', 'vooruitblik', // nl
'الأسبوع المقبل', 'القادم', // ar
'השבוע הבא', 'הקרוב', // he
'来週の展望', '今後', // ja
'주간 전망', '다가오는', // ko
'一周展望', '即将' // zh
];
if (fileName.includes('week-ahead') || fileName.includes('month-ahead') || prospectiveKeywords.some((kw) => lowerContent.includes(kw.toLowerCase()))) {
return 'prospective';
}
// Analysis: committee reports, propositions, motions
const analysisKeywords: string[] = [
'committee reports', 'analysis', 'review', 'assessment', // en
'utskottsbetänkanden', 'analys', 'granskning', 'betänkande', // sv
'udvalgsrapporter', 'analyse', 'gennemgang', 'udvalgsbetænkning', // da
'komitérapporter', 'gjennomgang', 'komitéinnstilling', // no
'valiokuntaraportit', 'analyysi', 'katsaus', 'valiokunnan mietintö', // fi
'ausschussberichte', 'überprüfung', 'ausschussbericht', // de
'rapports de commission', 'examen', 'rapport de commission', // fr
'informes de comité', 'análisis', 'revisión', 'informe de comité', // es
'commissierapporten', 'beoordeling', 'commissieverslag', // nl
'تقارير اللجان', 'تحليل', 'تقرير اللجنة', // ar
'דוחות ועדות', 'ניתוח', 'דוח ועדה', // he
'委員会報告', '分析', // ja
'위원회 보고서', '분석', // ko
'委员会报告', '分析' // zh
];
if (fileName.includes('committee-reports') || fileName.includes('propositions') || fileName.includes('motions') ||
fileName.includes('deep-inspection') ||
analysisKeywords.some((kw) => lowerContent.includes(kw.toLowerCase()))) {
return 'analysis';
}
// Breaking: urgent/alert news
const breakingKeywords: string[] = [
'breaking', 'urgent', 'alert', 'flash', // en
'senaste nytt', 'akut', 'brådskande', // sv
'seneste nyt', 'hastesag', // da
'siste nytt', 'haster', // no
'viimeisimmät', 'kiireellinen', 'hälytys', // fi
'eilmeldungen', 'dringend', 'alarm', // de
'dernières nouvelles', 'alerte', // fr
'última hora', 'urgente', 'alerta', // es
'laatste nieuws', 'alert', // nl
'أخبار عاجلة', 'عاجل', // ar
'חדשות אחרונות', 'דחוף', // he
'速報', '緊急', // ja
'속보', '긴급', // ko
'突发新闻', '紧急' // zh
];
if (fileName.includes('breaking') || breakingKeywords.some((kw) => lowerContent.includes(kw.toLowerCase()))) {
return 'breaking';
}
return 'retrospective';
}
/**
* Extract topics from article tags.
* Supports topic detection keywords in all 14 languages.
*/
export function extractTopics(content: string, fileName: string = ''): string[] {
const topics: string[] = [];
const tagPattern = /<meta\s+property=["']article:tag["']\s+content=["']([^"']+)["']/gi;
let match: RegExpExecArray | null;
while ((match = tagPattern.exec(content)) !== null) {
const tag: string = match[1]!.toLowerCase();
if (tag.includes('eu')) topics.push('eu');
if (tag.includes('parliament') || tag.includes('riksdag') || tag.includes('parlamentet') || tag.includes('議会') || tag.includes('의회') || tag.includes('议会') || tag.includes('البرلمان') || tag.includes('פרלמנט')) topics.push('parliament');
if (tag.includes('government') || tag.includes('regering') || tag.includes('regjeringen') || tag.includes('hallitus') || tag.includes('regierung') || tag.includes('gouvernement') || tag.includes('gobierno') || tag.includes('政府') || tag.includes('정부') || tag.includes('الحكومة') || tag.includes('ממשלה')) topics.push('government');
if (tag.includes('defense') || tag.includes('defence') || tag.includes('försvar') || tag.includes('forsvar') || tag.includes('puolustus') || tag.includes('verteidigung') || tag.includes('défense') || tag.includes('defensa') || tag.includes('defensie') || tag.includes('الدفاع') || tag.includes('הגנה') || tag.includes('防衛') || tag.includes('국방') || tag.includes('国防')) topics.push('defense');
if (tag.includes('environment') || tag.includes('miljö') || tag.includes('miljø') || tag.includes('ympäristö') || tag.includes('umwelt') || tag.includes('environnement') || tag.includes('medio ambiente') || tag.includes('milieu') || tag.includes('البيئة') || tag.includes('סביבה') || tag.includes('環境') || tag.includes('환경') || tag.includes('环境')) topics.push('environment');
if (tag.includes('committee') || tag.includes('utskott') || tag.includes('udvalg') || tag.includes('utvalg') || tag.includes('valiokunt') || tag.includes('ausschuss') || tag.includes('commission') || tag.includes('comité') || tag.includes('commissie') || tag.includes('لجنة') || tag.includes('ועדה') || tag.includes('委員会') || tag.includes('위원회') || tag.includes('委员会')) topics.push('committees');
if (tag.includes('legislation') || tag.includes('lagstiftning') || tag.includes('lovgivning') || tag.includes('lainsäädäntö') || tag.includes('gesetzgebung') || tag.includes('législation') || tag.includes('legislación') || tag.includes('wetgeving') || tag.includes('التشريعات') || tag.includes('חקיקה') || tag.includes('立法') || tag.includes('입법')) topics.push('legislation');
}
const sourceSample = `${fileName} ${content.slice(0, 2500)}`;
for (const [topic, pattern] of TOPIC_INFERENCE_PATTERNS) {
if (pattern.test(sourceSample)) topics.push(topic);
}
return [...new Set(topics)].slice(0, 5); // Unique, max 5
}
/**
* Extract tags from article:tag meta tags.
*/
export function extractTags(content: string, fileName: string = '', inferredTopics?: string[]): string[] {
const tags: string[] = [];
const tagPattern = /<meta\s+property=["']article:tag["']\s+content=["']([^"']+)["']/gi;
let match: RegExpExecArray | null;
while ((match = tagPattern.exec(content)) !== null) {
tags.push(match[1]!);
}
if (tags.length === 0) {
inferredTopics ??= extractTopics(content, fileName);
const inferredType = classifyArticleType(content, fileName);
tags.push(inferredType, ...inferredTopics);
}
return [...new Set(tags.filter((tag) => tag.trim().length > 0))].slice(0, 4); // Max 4 tags for display
}
/**
* Collect all article HTML file paths recursively from a directory.
* Supports date-based subdirectory structure: news/{year}/{month}/article.html
*/
function collectArticleFiles(dir: string): string[] {
const result: string[] = [];
const entries = fs.readdirSync(dir, { withFileTypes: true });
for (const entry of entries) {
if (entry.isDirectory()) {
result.push(...collectArticleFiles(path.join(dir, entry.name)));
} else if (entry.isFile() && entry.name.endsWith('.html') && !entry.name.startsWith('index')) {
result.push(path.join(dir, entry.name));
}
}
return result;
}
/**
* Scan news directory and group articles by language.
* Supports date-based subdirectory structure: news/{year}/{month}/article.html
*/
export function scanNewsArticles(): Record<string, NewsArticleMetadata[]> {
console.log('\n📰 Scanning for articles...');
const filePaths: string[] = collectArticleFiles(NEWS_DIR);
console.log(` Found ${filePaths.length} article files`);
// Initialize buckets for all 14 supported languages
const articlesByLang: Record<string, NewsArticleMetadata[]> = Object.fromEntries(
Object.keys(LANGUAGES).map((lang) => [lang, []]),
);
filePaths.forEach((filePath) => {
const metadata: NewsArticleMetadata | null = parseArticleMetadata(filePath);
Eif (metadata) {
// Set slug to relative path from NEWS_DIR (e.g., "2026/02/2026-02-13-article-en.html")
metadata.slug = path.relative(NEWS_DIR, filePath).split(path.sep).join('/');
Eif (articlesByLang[metadata.lang]) {
articlesByLang[metadata.lang]!.push(metadata);
}
}
});
// Sort by date descending (newest first)
Object.keys(articlesByLang).forEach((lang) => {
articlesByLang[lang]?.sort((a, b) => new Date(b.date).getTime() - new Date(a.date).getTime());
});
const langCounts: string[] = Object.entries(articlesByLang)
.filter(([, arr]) => arr.length > 0)
.map(([lang, arr]) => `${lang.toUpperCase()} ${arr.length}`);
console.log(` 📊 Articles by language: ${langCounts.length > 0 ? langCounts.join(', ') : 'none found'}`);
return articlesByLang;
}
/**
* Build map of base slugs to available languages for cross-language discovery.
*/
export function buildSlugToLanguagesMap(articlesByLang: Record<string, NewsArticleMetadata[]>): Record<string, string[]> {
const slugToLanguages: Record<string, string[]> = {};
// Iterate through all articles in all languages
Object.entries(articlesByLang).forEach(([_lang, articles]) => {
articles.forEach((article) => {
// Strip language suffix from slug to get base slug
const baseSlug: string = article.slug.replace(/-(en|sv|da|no|fi|de|fr|es|nl|ar|he|ja|ko|zh)\.html$/, '.html');
Eif (!slugToLanguages[article.slug]) {
slugToLanguages[article.slug] = [];
}
// Find all articles with the same base slug across languages
Object.entries(articlesByLang).forEach(([otherLang, otherArticles]) => {
otherArticles.forEach((otherArticle) => {
const otherBaseSlug: string = otherArticle.slug.replace(/-(en|sv|da|no|fi|de|fr|es|nl|ar|he|ja|ko|zh)\.html$/, '.html');
if (baseSlug === otherBaseSlug && !slugToLanguages[article.slug]!.includes(otherLang)) {
slugToLanguages[article.slug]!.push(otherLang);
}
});
});
});
});
return slugToLanguages;
}
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