@adonis-agora/agent/dist/src/channels/split.js

Governed, durable-backed AI agent (chat + tool-calling + governance) for AdonisJS — part of the Agora ecosystem.

/**
 * Split `text` into messages of at most `maxLength` characters, cutting where a reader would: at a
 * paragraph break, else a line break, else the end of a sentence, else a space — and only when
 * none of those falls past the first third of the window, mid-word. Whitespace at the cut is dropped;
 * empty pieces are never returned.
 */
export function splitMessage(text, maxLength) {
    if (!Number.isInteger(maxLength) || maxLength < 1) {
        throw new RangeError('maxLength must be a positive integer');
    }
    const pieces = [];
    let rest = text.trim();
    while (rest.length > maxLength) {
        const window = rest.slice(0, maxLength + 1);
        const floor = Math.floor(maxLength / 3);
        const cut = lastBreak(window, /\n\s*\n/g, floor) ??
            lastBreak(window, /\n/g, floor) ??
            lastBreak(window, /[.!?…](?=\s)/g, floor, true) ??
            lastBreak(window, /\s/g, floor) ??
            maxLength;
        const piece = rest.slice(0, cut).trimEnd();
        if (piece.length > 0)
            pieces.push(piece);
        rest = rest.slice(cut).trimStart();
    }
    if (rest.length > 0)
        pieces.push(rest);
    return pieces;
}
/**
 * Where the last match of `pattern` in `window` lets the text be cut, if that is past `floor`:
 * before the match, or after it (`keep` — a sentence keeps its full stop). `null` when there is none.
 */
function lastBreak(window, pattern, floor, keep = false) {
    let found = null;
    for (const match of window.matchAll(pattern)) {
        const index = match.index ?? 0;
        const at = keep ? index + match[0].length : index;
        // A cut must leave the piece within the limit (the window is one character longer).
        if (at > floor && at <= window.length - 1)
            found = at;
    }
    return found;
}
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