Method invoke

packages/graph/src/FunctionRegistry.ts:120–146

* Invoke a function with the given context.

(ctx: FunctionCallContext)

   * Invoke a function with the given context.
   */
  public invoke(ctx: FunctionCallContext): unknown {
    const def = this.get(ctx.name);
    if (!def) {
      throw new Error(`Unknown function: ${ctx.name}`);
    }

    // Validate argument count
    const requiredArgs = def.args.filter((a) => a.required).length;
    if (ctx.args.length < requiredArgs) {
      throw new Error(
        `Function ${ctx.name} requires at least ${requiredArgs} argument(s), got ${ctx.args.length}`,
      );
    }
    // Skip max args check for variadic functions
    if (!def.variadic && ctx.args.length > def.args.length) {
      throw new Error(
        `Function ${ctx.name} accepts at most ${def.args.length} argument(s), got ${ctx.args.length}`,
      );
    }

    // Validate DISTINCT usage
    if (ctx.distinct && !def.supportsDistinct) {
      throw new Error(`Function ${ctx.name} does not support DISTINCT`);
    }

    return def.impl(ctx.args, ctx.path);
  }

  /**
   * Get all registered function names.