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import { hasOwnPrototype, hasOwnWritablePrototype } from './utility';
import {
getFunctionSource,
getDefinedConstructor,
getDefinedConstructorName,
getTypeSignature,
getTaggedType,
resolveType
} from '../utility';
import { isFunction } from '../base';
// ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- -----
/** @typedef {import('./typedef.js').ClassConstructor<typeof Function>} ClassConstructor */
/**
* Detects whether the passed `value` is a
* constructor function implemented as `class`.
* @param {any} [value]
* An optionally passed value of any type.
* @returns {value is ClassConstructor}
* A boolean value which indicates whether the
* tested value is a class-constructor function.
* @category Function Type Detection
*/
export function isClass(value) {
return (
isFunction(value) && getFunctionSource(value).startsWith('class')
// (/^class(\s+[^{]+)?\s*{/).test(getFunctionSource(value))
);
}
// /**
// * @template {new (...args: any[]) => any} T
// * @typedef {import('./typedef.js').SubclassedConstructor<T>} SubclassedConstructor
// */
//
// /**
// * Detects whether the passed `value` is a
// * constructor function implemented as `class`
// * that in addition extends another class.
// * @param {any} [value]
// * An optionally passed value of any type.
// * @returns {value is SubclassedConstructor}
// * A boolean value which indicates whether the
// * tested value is a subclassed constructor function.
// * @category Function Type Detection
// */
// export function isSubclass(value) {
// return (
// isClass(value) &&
// // see ... [https://regex101.com/r/MoEhSd/1]
// /^class\s+([_$\p{L}][_$\p{L}\p{N}]+\s+)?extends\b/u.test(getFunctionSource(value))
// );
// }
// ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- -----
/** @typedef {import('./typedef.js').GeneratorFunction} GeneratorFunction */
/**
* Detects whether the passed `value` is exclusively a `GeneratorFunction` type.
* @param {any} [value]
* An optionally passed value of any type.
* @returns {value is GeneratorFunction}
* A boolean value which indicates whether the tested value is exclusively a
* `GeneratorFunction` type.
* @category Function Type Detection
*/
export function isGeneratorFunction(value) {
return (
isFunction(value) &&
getTypeSignature(value) === '[object GeneratorFunction]' &&
resolveType(value) === 'GeneratorFunction'
);
}
/** @typedef {import('./typedef.js').AsyncGeneratorFunction} AsyncGeneratorFunction */
/**
* Detects whether the passed `value` is exclusively an `AsyncGeneratorFunction` type.
* @param {any} [value]
* An optionally passed value of any type.
* @returns {value is AsyncGeneratorFunction}
* A boolean value which indicates whether the tested value is exclusively an
* `AsyncGeneratorFunction` type.
* @category Function Type Detection
*/
export function isAsyncGeneratorFunction(value) {
return (
isFunction(value) &&
getTypeSignature(value) === '[object AsyncGeneratorFunction]' &&
resolveType(value) === 'AsyncGeneratorFunction'
);
}
/** @typedef {import('./typedef.js').AnyGeneratorFunction} AnyGeneratorFunction */
/**
* Detects whether the passed `value` is either kind of generator function,
* async or non-async.
* @param {any} [value]
* An optionally passed value of any type.
* @returns {value is AnyGeneratorFunction}
* A boolean value which indicates whether the tested value is either
* an async or a non-async generator function.
* @category Function Type Detection
*/
export function isAnyGeneratorFunction(value) {
if (isFunction(value)) {
const typeName = resolveType(value);
const taggedType = getTaggedType(value);
return (
!!typeName &&
typeName === taggedType &&
(typeName === 'GeneratorFunction' || typeName === 'AsyncGeneratorFunction')
);
}
return false;
}
// ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- -----
/** @typedef {import('./typedef.js').AsyncFunction} AsyncFunction */
/**
* Detects whether the passed `value` is an async function type, either an
* async arrow function expression or an async non-arrow function expression
* or an async function statement.
* It does not detect an async generator function since the latter is not
* an async function itself but the factory function of an async generator.
* Async functions do return promises but do not return async generators.
* @param {any} [value]
* An optionally passed value of any type.
* @returns {value is AsyncFunction}
* A boolean value which indicates whether
* the tested value is an async function.
* @category Function Type Detection
*/
export function isAsyncFunction(value) {
return (
isFunction(value) &&
getTypeSignature(value) === '[object AsyncFunction]' &&
getDefinedConstructorName(value) === 'AsyncFunction'
);
}
/**
* Detects whether the passed `value` is exclusively one of following two
* async function variants, either an async non-arrow function expression
* or an async function statement.
* @param {any} [value]
* An optionally passed value of any type.
* @returns {value is AsyncFunction}
* A boolean value which indicates whether the tested value does match
* exclusively a non-arrow async function.
* @category Function Type Detection
*/
export function isAsyncNonArrow(value) {
return (
isAsyncFunction(value) &&
// see ... [https://regex101.com/r/9SamJe/2]
!/^async\s+(?:\(.*?\)|[^(),=]+)\s*=>/.test(getFunctionSource(value))
);
}
/**
* Detects whether the passed `value` is exclusively an async arrow function.
* @param {any} [value]
* An optionally passed value of any type.
* @returns {value is AsyncFunction}
* A boolean value which indicates whether the tested value is exclusively
* an async arrow function.
* @category Function Type Detection
*/
export function isAsyncArrow(value) {
return (
isAsyncFunction(value) &&
// see ... [https://regex101.com/r/9SamJe/2]
/^async\s+(?:\(.*?\)|[^(),=]+)\s*=>/.test(getFunctionSource(value))
);
}
/** @typedef {import('./typedef.js').NonAsyncArrow} NonAsyncArrow */
/**
* Detects whether the passed `value` is exclusively a non-async arrow function.
* @param {any} [value]
* An optionally passed value of any type.
* @returns {value is NonAsyncArrow}
* A boolean value which indicates whether the tested value is exclusively
* a non-async arrow function.
* @category Function Type Detection
*/
export function isNonAsyncArrow(value) {
return isArrow(value) && !isAsyncFunction(value);
}
/** @typedef {import('./typedef.js').AnyArrow} AnyArrow */
/**
* Detects whether the passed `value` is either kind of an arrow
* function expression - async or non-async.
* @param {any} [value]
* An optionally passed value of any type.
* @returns {value is AnyArrow}
* A boolean value which indicates whether the tested value is
* either an async or a non-async arrow function expression.
* @category Function Type Detection
*/
export function isArrow(value) {
return (
isFunction(value) &&
// see ... [https://regex101.com/r/9SamJe/1]
/^(?:async\s+)?(?:\(.*?\)|[^(),=]+)\s*=>/.test(getFunctionSource(value))
);
}
// ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- -----
/** @typedef {import('./typedef.js').ES3Function} ES3Function */
/**
* Detects whether the passed `value` is exclusively the only available
* function type of ES3 (in addition to all the built-in constructors).
* @param {any} [value]
* An optionally passed value of any type.
* @returns {value is ES3Function}
* A boolean value which indicates whether the tested value is exclusively
* the only available/known function type back at ES3 (in addition to all
* the built-in constructor functions).
* @category Function Type Detection
*/
export function isES3Function(value) {
return (
isFunction(value) &&
hasOwnWritablePrototype(value) &&
!isAnyGeneratorFunction(value) &&
!getFunctionSource(getDefinedConstructor(value)).startsWith('class')
// (/^class(\s+[^{]+)?\s*{/).test(getFunctionSource(getDefinedConstructor(value)))
// !isExtendedFunction(value)
);
}
// ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- -----
/** @typedef {import('./typedef.js').ConciseGenericMethod} ConciseGenericMethod */
/**
* Detects whether the passed `value` is a concise generic method, a function
* which has been created exclusively by a non-async and non-generator shorthand
* method definition.
* @param {any} [value]
* An optionally passed value of any type.
* @returns {value is ConciseGenericMethod}
* A boolean value which indicates whether the tested value is exclusively a
* concise generic method, a function created by a non-async and non-generator
* shorthand method definition.
* @category Function Type Detection
*/
export function isConciseGenericMethod(value) {
return (
isFunction(value) &&
!hasOwnPrototype(value) &&
getTypeSignature(value) === '[object Function]' &&
getDefinedConstructorName(value) === 'Function' &&
// - until here all above steps do apply
// for non-async arrow functions too.
!isArrow(value)
);
}
// ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- -----
/**
* Detects whether the passed `value` is a generic (unspecific/non-specific)
* function ...
*
* - either a good old ES3 function,
* - or a non-async arrow function expression.
* - or either a non-async and non-generator concise method (shorthand function definition).
*
* Thus, the following specific (non-generic) function types are excluded ...
*
* - class constructor functions,
* - any generator function,
* - any async function variant,
* - extended `Function` types,
* - built-in constructor functions,
* - Web Api constructor functions.
* @param {any} [value]
* An optionally passed value of any type.
* @returns {value is (ES3Function | NonAsyncArrow)}
* A boolean value which indicates whether the tested value is either
* a good old ES3 function or a non-async arrow function expression.
* @category Function Type Detection
*/
export function isGenericFunction(value) {
return (
isFunction(value) &&
// non-async arrow-functions and shorthand methods (aka concise methods)
(!hasOwnPrototype(value)
? getTypeSignature(value) === '[object Function]' &&
getDefinedConstructorName(value) === 'Function'
: // ES3 function
hasOwnWritablePrototype(value) &&
!isAnyGeneratorFunction(value) &&
!getFunctionSource(getDefinedConstructor(value)).startsWith('class'))
);
// // ... was ...
//
// return isNonAsyncArrow(value) || isES3Function(value);
//
// // ... but is too strict due to methods that are written like ...
// //
// // const idealThenable = {
// // // Concise Method Syntax aka "Shorthand Method Definitions"
// // then(onFulfilled, onRejected) {
// // try {
// // const result = 'fulfilled from thenable';
// // if (typeof onFulfilled === 'function') {
// // onFulfilled(result);
// // }
// // } catch (err) {
// // if (typeof onRejected === 'function') {
// // onRejected(err);
// // }
// // }
// // }
// // };
// // ... where `then` is a function which does not have an own `prototype` descriptor slot.
}
// // ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- -----
//
// /** @typedef {import('./typedef.js').FunctionSubtype<Function>} FunctionSubtype */
//
// /**
// * Detects whether the passed `value` is exclusively an instance
// * of a `Function` subclass, hence a `Function` subtype of e.g.
// * following form ...
// *
// * ```
// * class Applicator extends Function {
// * constructor(...args) {
// * super(...args);
// * }
// * }
// * // - constructable and callable instance of the
// * // custom `Applicator` function subtype/class.
// * const Area = new Applicator('length = 1, width = 1', 'this.area = length * width');
// *
// * console.log(new Area); // { area: 1 }
// * ```
// * @param {any} [value]
// * An optionally passed value of any type.
// * @returns {value is FunctionSubtype}
// * A boolean value which indicates whether the tested type is a
// * `Function` subtype (an instance of a class which extends `Function`).
// * @category Function Type Detection
// */
// export function isFunctionSubtype(value) {
// return (
// isFunction(value) &&
// getFunctionSource(
// getOwnPropertyDescriptor(value, 'constructor') ?? value.constructor ?? ((_) => _)
// ).startsWith('class')
// );
// }
//
// // ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- -----
/** @typedef {import('./typedef.js').UnnamedFunction} UnnamedFunction */
/**
* Detects whether the passed `value` is any kind of function type
* but without a given name.
* @param {any} [value]
* An optionally passed value of any type.
* @returns {value is UnnamedFunction}
* A boolean value which indicates whether
* the tested type is an unnamed function.
* @category Function Type Detection
*/
export function isUnnamedFunction(value) {
return isFunction(value) && value.name === '';
}
// ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- -----
|