57 lines
2 KiB
TypeScript
57 lines
2 KiB
TypeScript
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import { readFileSync } from "node:fs";
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import * as path from "node:path";
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import { fileURLToPath } from "node:url";
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/**
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* Parse `const NAME = <numeric expr>;` constants out of a JS/TS source — the
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* ONE source of truth for the ngspice transport numbers. The reducer and the
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* parity tripwire derive their expectations from here instead of hardcoding
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* copies that silently go stale when the protocol numbers move.
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*/
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const here = path.dirname(fileURLToPath(import.meta.url));
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export const repoRoot = path.resolve(here, "../../..");
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export function readRepoFile(rel: string): string {
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return readFileSync(path.join(repoRoot, rel), "utf8");
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}
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export function parseConstants(
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source: string,
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names: readonly string[],
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label: string,
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): Record<string, number> {
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const out: Record<string, number> = {};
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for (const name of names) {
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const m = source.match(new RegExp(`const ${name}\\s*=\\s*([^;]+);`));
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if (!m) throw new Error(`${label}: constant ${name} not found`);
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const expr = m[1]!.trim();
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// Strictly digits/arithmetic/underscores — anything else is rejected, so
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// the Function() evaluation below can only compute a number, never run
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// code from the scanned source.
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if (!/^[\d\s*+\-()_]+$/.test(expr)) {
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throw new Error(`${label}: constant ${name} is not a numeric expression: ${expr}`);
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}
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out[name] = Function(`"use strict"; return (${expr});`)() as number;
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}
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return out;
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}
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export const NGSPICE_WORKER_REL = "web/standalone/src/wasm/ngspice-worker.js";
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export const NGSPICE_WORKER_CONSTANTS = [
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"MAX_EVENT_BATCH_LINES",
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"MAX_EVENT_BATCH_UTF8_BYTES",
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"MAX_EVENT_UNACKED_FRAMES",
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"MAX_EVENT_UNACKED_UTF8_BYTES",
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"MAX_DEFERRED_EVENTS",
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"MAX_DEFERRED_UTF8_BYTES",
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] as const;
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/** The production worker's transport constants, parsed from its source. */
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export function ngspiceWorkerConstants(): Record<string, number> {
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return parseConstants(
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readRepoFile(NGSPICE_WORKER_REL),
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NGSPICE_WORKER_CONSTANTS,
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NGSPICE_WORKER_REL,
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);
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}
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