injection-js/reflection/reflection_capabilities.js

/**
 * @license
 * Copyright Google Inc. All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
import { __spreadArrays } from "tslib";
import { global, stringify } from '../facade/lang';
import { Type, isType } from '../facade/type';
/**
 * Attention: This regex has to hold even if the code is minified!
 */
export var DELEGATE_CTOR = /^function\s+\S+\(\)\s*{[\s\S]+\.apply\(this,\s*arguments\)/;
var ReflectionCapabilities = /** @class */ (function () {
    function ReflectionCapabilities(reflect) {
        this._reflect = reflect || global['Reflect'];
    }
    ReflectionCapabilities.prototype.isReflectionEnabled = function () {
        return true;
    };
    ReflectionCapabilities.prototype.factory = function (t) {
        return function () {
            var args = [];
            for (var _i = 0; _i < arguments.length; _i++) {
                args[_i] = arguments[_i];
            }
            return new (t.bind.apply(t, __spreadArrays([void 0], args)))();
        };
    };
    /** @internal */
    ReflectionCapabilities.prototype._zipTypesAndAnnotations = function (paramTypes, paramAnnotations) {
        var result;
        if (typeof paramTypes === 'undefined') {
            result = new Array(paramAnnotations.length);
        }
        else {
            result = new Array(paramTypes.length);
        }
        for (var i = 0; i < result.length; i++) {
            // TS outputs Object for parameters without types, while Traceur omits
            // the annotations. For now we preserve the Traceur behavior to aid
            // migration, but this can be revisited.
            if (typeof paramTypes === 'undefined') {
                result[i] = [];
                // tslint:disable-next-line:triple-equals
            }
            else if (paramTypes[i] != Object) {
                result[i] = [paramTypes[i]];
            }
            else {
                result[i] = [];
            }
            if (paramAnnotations && paramAnnotations[i] != null) {
                result[i] = result[i].concat(paramAnnotations[i]);
            }
        }
        return result;
    };
    ReflectionCapabilities.prototype._ownParameters = function (type, parentCtor) {
        // If we have no decorators, we only have function.length as metadata.
        // In that case, to detect whether a child class declared an own constructor or not,
        // we need to look inside of that constructor to check whether it is
        // just calling the parent.
        // This also helps to work around for https://github.com/Microsoft/TypeScript/issues/12439
        // that sets 'design:paramtypes' to []
        // if a class inherits from another class but has no ctor declared itself.
        if (DELEGATE_CTOR.exec(type.toString())) {
            return null;
        }
        // Prefer the direct API.
        if (type.parameters && type.parameters !== parentCtor.parameters) {
            return type.parameters;
        }
        // API of tsickle for lowering decorators to properties on the class.
        var tsickleCtorParams = type.ctorParameters;
        if (tsickleCtorParams && tsickleCtorParams !== parentCtor.ctorParameters) {
            // Newer tsickle uses a function closure
            // Retain the non-function case for compatibility with older tsickle
            var ctorParameters = typeof tsickleCtorParams === 'function' ? tsickleCtorParams() : tsickleCtorParams;
            var paramTypes = ctorParameters.map(function (ctorParam) { return ctorParam && ctorParam.type; });
            var paramAnnotations = ctorParameters.map(function (ctorParam) { return ctorParam && convertTsickleDecoratorIntoMetadata(ctorParam.decorators); });
            return this._zipTypesAndAnnotations(paramTypes, paramAnnotations);
        }
        // API for metadata created by invoking the decorators.
        if (this._reflect != null && this._reflect.getOwnMetadata != null) {
            var paramAnnotations = this._reflect.getOwnMetadata('parameters', type);
            var paramTypes = this._reflect.getOwnMetadata('design:paramtypes', type);
            if (paramTypes || paramAnnotations) {
                return this._zipTypesAndAnnotations(paramTypes, paramAnnotations);
            }
        }
        // If a class has no decorators, at least create metadata
        // based on function.length.
        // Note: We know that this is a real constructor as we checked
        // the content of the constructor above.
        return new Array(type.length).fill(undefined);
    };
    ReflectionCapabilities.prototype.parameters = function (type) {
        // Note: only report metadata if we have at least one class decorator
        // to stay in sync with the static reflector.
        if (!isType(type)) {
            return [];
        }
        var parentCtor = getParentCtor(type);
        var parameters = this._ownParameters(type, parentCtor);
        if (!parameters && parentCtor !== Object) {
            parameters = this.parameters(parentCtor);
        }
        return parameters || [];
    };
    ReflectionCapabilities.prototype._ownAnnotations = function (typeOrFunc, parentCtor) {
        // Prefer the direct API.
        if (typeOrFunc.annotations && typeOrFunc.annotations !== parentCtor.annotations) {
            var annotations = typeOrFunc.annotations;
            if (typeof annotations === 'function' && annotations.annotations) {
                annotations = annotations.annotations;
            }
            return annotations;
        }
        // API of tsickle for lowering decorators to properties on the class.
        if (typeOrFunc.decorators && typeOrFunc.decorators !== parentCtor.decorators) {
            return convertTsickleDecoratorIntoMetadata(typeOrFunc.decorators);
        }
        // API for metadata created by invoking the decorators.
        if (this._reflect && this._reflect.getOwnMetadata) {
            return this._reflect.getOwnMetadata('annotations', typeOrFunc);
        }
        return null;
    };
    ReflectionCapabilities.prototype.annotations = function (typeOrFunc) {
        if (!isType(typeOrFunc)) {
            return [];
        }
        var parentCtor = getParentCtor(typeOrFunc);
        var ownAnnotations = this._ownAnnotations(typeOrFunc, parentCtor) || [];
        var parentAnnotations = parentCtor !== Object ? this.annotations(parentCtor) : [];
        return parentAnnotations.concat(ownAnnotations);
    };
    ReflectionCapabilities.prototype._ownPropMetadata = function (typeOrFunc, parentCtor) {
        // Prefer the direct API.
        if (typeOrFunc.propMetadata && typeOrFunc.propMetadata !== parentCtor.propMetadata) {
            var propMetadata = typeOrFunc.propMetadata;
            if (typeof propMetadata === 'function' && propMetadata.propMetadata) {
                propMetadata = propMetadata.propMetadata;
            }
            return propMetadata;
        }
        // API of tsickle for lowering decorators to properties on the class.
        if (typeOrFunc.propDecorators && typeOrFunc.propDecorators !== parentCtor.propDecorators) {
            var propDecorators_1 = typeOrFunc.propDecorators;
            var propMetadata_1 = {};
            Object.keys(propDecorators_1).forEach(function (prop) {
                propMetadata_1[prop] = convertTsickleDecoratorIntoMetadata(propDecorators_1[prop]);
            });
            return propMetadata_1;
        }
        // API for metadata created by invoking the decorators.
        if (this._reflect && this._reflect.getOwnMetadata) {
            return this._reflect.getOwnMetadata('propMetadata', typeOrFunc);
        }
        return null;
    };
    ReflectionCapabilities.prototype.propMetadata = function (typeOrFunc) {
        if (!isType(typeOrFunc)) {
            return {};
        }
        var parentCtor = getParentCtor(typeOrFunc);
        var propMetadata = {};
        if (parentCtor !== Object) {
            var parentPropMetadata_1 = this.propMetadata(parentCtor);
            Object.keys(parentPropMetadata_1).forEach(function (propName) {
                propMetadata[propName] = parentPropMetadata_1[propName];
            });
        }
        var ownPropMetadata = this._ownPropMetadata(typeOrFunc, parentCtor);
        if (ownPropMetadata) {
            Object.keys(ownPropMetadata).forEach(function (propName) {
                var decorators = [];
                if (propMetadata.hasOwnProperty(propName)) {
                    decorators.push.apply(decorators, propMetadata[propName]);
                }
                decorators.push.apply(decorators, ownPropMetadata[propName]);
                propMetadata[propName] = decorators;
            });
        }
        return propMetadata;
    };
    ReflectionCapabilities.prototype.hasLifecycleHook = function (type, lcProperty) {
        return type instanceof Type && lcProperty in type.prototype;
    };
    ReflectionCapabilities.prototype.getter = function (name) {
        return new Function('o', 'return o.' + name + ';');
    };
    ReflectionCapabilities.prototype.setter = function (name) {
        return new Function('o', 'v', 'return o.' + name + ' = v;');
    };
    ReflectionCapabilities.prototype.method = function (name) {
        var functionBody = "if (!o." + name + ") throw new Error('\"" + name + "\" is undefined');\n        return o." + name + ".apply(o, args);";
        return new Function('o', 'args', functionBody);
    };
    // There is not a concept of import uri in Js, but this is useful in developing Dart applications.
    ReflectionCapabilities.prototype.importUri = function (type) {
        // StaticSymbol
        if (typeof type === 'object' && type['filePath']) {
            return type['filePath'];
        }
        // Runtime type
        return "./" + stringify(type);
    };
    ReflectionCapabilities.prototype.resourceUri = function (type) {
        return "./" + stringify(type);
    };
    ReflectionCapabilities.prototype.resolveIdentifier = function (name, moduleUrl, members, runtime) {
        return runtime;
    };
    ReflectionCapabilities.prototype.resolveEnum = function (enumIdentifier, name) {
        return enumIdentifier[name];
    };
    return ReflectionCapabilities;
}());
export { ReflectionCapabilities };
function convertTsickleDecoratorIntoMetadata(decoratorInvocations) {
    if (!decoratorInvocations) {
        return [];
    }
    return decoratorInvocations.map(function (decoratorInvocation) {
        var decoratorType = decoratorInvocation.type;
        var annotationCls = decoratorType.annotationCls;
        var annotationArgs = decoratorInvocation.args ? decoratorInvocation.args : [];
        return new (annotationCls.bind.apply(annotationCls, __spreadArrays([void 0], annotationArgs)))();
    });
}
function getParentCtor(ctor) {
    if (!ctor.prototype) {
        return Object;
    }
    var parentProto = Object.getPrototypeOf(ctor.prototype);
    var parentCtor = parentProto ? parentProto.constructor : null;
    // Note: We always use `Object` as the null value
    // to simplify checking later on.
    return parentCtor || Object;
}
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