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70 lines
2.0 KiB
Markdown
70 lines
2.0 KiB
Markdown
# catena
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Turn a pile of files into a searchable corpus: chunking, scrubbing, subtitles
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and rank fusion, as WebAssembly.
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```sh
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npm install catena
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```
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```js
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import { chunkMarkdown, scrub, countTokens, fuseHits } from "catena";
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const chunks = chunkMarkdown(markdown, 512, 64);
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chunks[0].page; // 41
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chunks[0].chapter; // 'III. The Second Estate'
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const clean = scrub(rawMarkdown, true);
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countTokens(clean);
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fuseHits([...vectorHits, ...textHits], undefined, { vec: 2 }, 20);
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```
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Records come back as plain objects — the same documents the command-line
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tools write, with the same field names and the same stability promise.
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Nothing has to be freed.
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`splitCollection` throws when the document is one work rather than a
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collection, which is the usual answer:
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```js
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let works;
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try {
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works = splitCollection(markdown);
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} catch (why) {
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works = [{ idx: 0, title, text: markdown }];
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}
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```
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## What is here
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| `chunkMarkdown` | Markdown into passages that carry their page, chapter and role |
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| `scrub` | Converted markdown in, clean markdown out |
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| `countTokens` | Tokens, by the encoding the budgets count in |
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| `parseSubtitles` | SubRip, WebVTT or ASS into cues |
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| `packCues` | Cues into passages, keeping the times they were said at |
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| `splitCollection` | One markdown file into the works inside it |
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| `fuseHits` | Several ranked lists into one |
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| `identify` | What a file is, from its first bytes |
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The tools that read files or call another program are not here: a browser has
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neither, and a binding that pretends otherwise fails at run time rather than
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at compile time. Those stay command-line tools.
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## Node and the web
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```js
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import { chunkMarkdown } from "catena"; // resolves per environment
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import { chunkMarkdown } from "catena/node"; // or pick one
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import { chunkMarkdown } from "catena/web";
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```
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Two builds because the loaders differ: node reads the `.wasm` off disk at
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import, the web build takes a URL a bundler rewrites.
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## Licence
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MPL-2.0. Source: <https://git.pumpin.online/funkpower/catena>
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