Function buildSegments

packages/e2e-tests/src/cache-analysis.ts:109–133

(body: MinimalRequest["body"])

/** Build the wire-order segment list: system blocks first, then every message. */
export function buildSegments(body: MinimalRequest["body"]): WireSegment[] {
    const segs: WireSegment[] = [];
    const system = body.system;
    const sysBlocks = Array.isArray(system) ? system : system != null ? [system] : [];
    sysBlocks.forEach((b, i) => {
        const raw = blockText(b);
        segs.push({
            id: `system[${i}]`,
            hash: sha(normalizeSystemText(raw)),
            bytes: Buffer.byteLength(raw),
            breakpoint: hasCacheControl(b),
        });
    });
    const messages = Array.isArray(body.messages) ? (body.messages as Json[]) : [];
    messages.forEach((m, i) => {
        const norm = JSON.stringify({ role: m.role, content: stripCacheControl(m.content) });
        segs.push({
            id: `message[${i}](${String(m.role)})`,
            hash: sha(norm),
            bytes: Buffer.byteLength(JSON.stringify(m)),
            breakpoint: messageHasBreakpoint(m),
        });
    });
    return segs;
}

/** First wire-order segment index where prev/cur diverge (added/removed/changed). */
function firstDivergence(prev: WireSegment[], cur: WireSegment[]): number {