saikiranvella
44 lines
1.6 KiB
TypeScript
44 lines
1.6 KiB
TypeScript
/**
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* Minimal RSS/Atom extraction — enough for EDGAR atom feeds and PR-wire RSS.
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* Deliberately dependency-free; if a feed outgrows this, swap in
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* fast-xml-parser without touching the pollers' output shape.
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*/
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export class RssParser {
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/** Extract raw <item>…</item> or <entry>…</entry> blocks. */
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static blocks(xml: string, tag: 'item' | 'entry'): string[] {
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const re = new RegExp(`<${tag}[\\s>][\\s\\S]*?<\\/${tag}>`, 'g');
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return xml.match(re) ?? [];
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}
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/** First occurrence of a simple tag's text content, entity-decoded. */
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static tag(block: string, name: string): string | null {
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const re = new RegExp(`<${name}[^>]*>([\\s\\S]*?)<\\/${name}>`, 'i');
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const m = block.match(re);
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return m ? RssParser.clean(m[1]) : null;
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}
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/** Atom-style <link href="…"/> (self-closing) or RSS <link>…</link>. */
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static link(block: string): string | null {
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const href = block.match(/<link[^>]*href="([^"]+)"/i);
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if (href) return RssParser.decode(href[1].trim());
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return RssParser.tag(block, 'link');
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}
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private static clean(raw: string): string {
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const noCdata = raw.replace(/<!\[CDATA\[([\s\S]*?)\]\]>/g, '$1');
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const noTags = noCdata.replace(/<[^>]+>/g, ' ');
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return RssParser.decode(noTags).replace(/\s+/g, ' ').trim();
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}
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private static decode(s: string): string {
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return s
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.replace(/&/g, '&')
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.replace(/</g, '<')
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.replace(/>/g, '>')
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.replace(/"/g, '"')
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.replace(/�?39;/g, "'")
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.replace(/'/g, "'")
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.replace(/&#(\d+);/g, (_, n) => String.fromCharCode(Number(n)));
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}
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}
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