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// Port of expr-lang/expr builtin/function.go

import type { Type } from "../checker/nature/type.js";

export class Func {

Name: string;

// Fast: func(arg any) any

Fast?: (arg: any) => any;

// Func: func(args ...any) (any, error)

Func?: (...args: any[]) => any;

// Safe: func(args ...any) (any, uint, error)

Safe?: (...args: any[]) => [any, number];

// Types: []reflect.Type

Types?: Type[];

// Validate: func(args []reflect.Type) (reflect.Type, error)

Validate?: (args: Type[]) => Type;

// Deref: func(i int, arg reflect.Type) bool

Deref?: (i: number, arg: Type) => boolean;

Predicate: boolean;

constructor(init: Partial<Func> = {}) {

this.Name = init.Name ?? "";

this.Fast = init.Fast;

this.Func = init.Func;

this.Safe = init.Safe;

this.Types = init.Types;

this.Validate = init.Validate;

this.Deref = init.Deref;

this.Predicate = init.Predicate ?? false;

}

Type(): Type | null {

if (this.Types && this.Types.length > 0) {

return this.Types[0]!;

}

return null;

}

}

// Alias preserving upstream Go name "Function".

export { Func as Function };