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import nlp from "compromise";
/**
* Split text into chunks of specified max size with some overlap for continuity.
*/
export default function chunkText(
text: string,
maxChunkSize: number,
overlap: number = 0.2,
): string[] {
const sentences = nlp(text).sentences().out("array");
const chunks = [];
let currentChunk: string[] = [];
let currentSize = 0;
for (let i = 0; i < sentences.length; i++) {
const sentence = sentences[i];
currentChunk.push(sentence);
currentSize += sentence.length;
if (currentSize >= maxChunkSize) {
// Calculate overlap
const overlapSize = Math.floor(currentChunk.length * overlap);
const chunkText = currentChunk.join(" ");
chunks.push({
text: chunkText,
start: i - currentChunk.length + 1,
end: i,
});
// Prepare the next chunk with overlap
currentChunk = currentChunk.slice(-overlapSize);
currentSize = currentChunk.reduce((sum, s) => sum + s.length, 0);
}
}
if (currentChunk.length > 0) {
const chunkText = currentChunk.join(" ");
chunks.push({
text: chunkText,
start: sentences.length - currentChunk.length,
end: sentences.length,
});
}
return chunks.map((chunk) => chunk.text);
}
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