@angular/core
Version:
Angular - the core framework
129 lines • 15.9 kB
JavaScript
/**
* @license
* Copyright Google LLC 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 { ɵstringify as stringify } from '@angular/core';
let _nextReferenceId = 0;
export class MetadataOverrider {
constructor() {
this._references = new Map();
}
/**
* Creates a new instance for the given metadata class
* based on an old instance and overrides.
*/
overrideMetadata(metadataClass, oldMetadata, override) {
const props = {};
if (oldMetadata) {
_valueProps(oldMetadata).forEach((prop) => props[prop] = oldMetadata[prop]);
}
if (override.set) {
if (override.remove || override.add) {
throw new Error(`Cannot set and add/remove ${stringify(metadataClass)} at the same time!`);
}
setMetadata(props, override.set);
}
if (override.remove) {
removeMetadata(props, override.remove, this._references);
}
if (override.add) {
addMetadata(props, override.add);
}
return new metadataClass(props);
}
}
function removeMetadata(metadata, remove, references) {
const removeObjects = new Set();
for (const prop in remove) {
const removeValue = remove[prop];
if (Array.isArray(removeValue)) {
removeValue.forEach((value) => {
removeObjects.add(_propHashKey(prop, value, references));
});
}
else {
removeObjects.add(_propHashKey(prop, removeValue, references));
}
}
for (const prop in metadata) {
const propValue = metadata[prop];
if (Array.isArray(propValue)) {
metadata[prop] = propValue.filter((value) => !removeObjects.has(_propHashKey(prop, value, references)));
}
else {
if (removeObjects.has(_propHashKey(prop, propValue, references))) {
metadata[prop] = undefined;
}
}
}
}
function addMetadata(metadata, add) {
for (const prop in add) {
const addValue = add[prop];
const propValue = metadata[prop];
if (propValue != null && Array.isArray(propValue)) {
metadata[prop] = propValue.concat(addValue);
}
else {
metadata[prop] = addValue;
}
}
}
function setMetadata(metadata, set) {
for (const prop in set) {
metadata[prop] = set[prop];
}
}
function _propHashKey(propName, propValue, references) {
let nextObjectId = 0;
const objectIds = new Map();
const replacer = (key, value) => {
if (value !== null && typeof value === 'object') {
if (objectIds.has(value)) {
return objectIds.get(value);
}
// Record an id for this object such that any later references use the object's id instead
// of the object itself, in order to break cyclic pointers in objects.
objectIds.set(value, `ɵobj#${nextObjectId++}`);
// The first time an object is seen the object itself is serialized.
return value;
}
else if (typeof value === 'function') {
value = _serializeReference(value, references);
}
return value;
};
return `${propName}:${JSON.stringify(propValue, replacer)}`;
}
function _serializeReference(ref, references) {
let id = references.get(ref);
if (!id) {
id = `${stringify(ref)}${_nextReferenceId++}`;
references.set(ref, id);
}
return id;
}
function _valueProps(obj) {
const props = [];
// regular public props
Object.keys(obj).forEach((prop) => {
if (!prop.startsWith('_')) {
props.push(prop);
}
});
// getters
let proto = obj;
while (proto = Object.getPrototypeOf(proto)) {
Object.keys(proto).forEach((protoProp) => {
const desc = Object.getOwnPropertyDescriptor(proto, protoProp);
if (!protoProp.startsWith('_') && desc && 'get' in desc) {
props.push(protoProp);
}
});
}
return props;
}
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {ɵstringify as stringify} from '@angular/core';\n\nimport {MetadataOverride} from './metadata_override';\n\ntype StringMap = {\n  [key: string]: any\n};\n\nlet _nextReferenceId = 0;\n\nexport class MetadataOverrider {\n  private _references = new Map<any, string>();\n  /**\n   * Creates a new instance for the given metadata class\n   * based on an old instance and overrides.\n   */\n  overrideMetadata<C extends T, T>(\n      metadataClass: {new(options: T): C;}, oldMetadata: C, override: MetadataOverride<T>): C {\n    const props: StringMap = {};\n    if (oldMetadata) {\n      _valueProps(oldMetadata).forEach((prop) => props[prop] = (<any>oldMetadata)[prop]);\n    }\n\n    if (override.set) {\n      if (override.remove || override.add) {\n        throw new Error(`Cannot set and add/remove ${stringify(metadataClass)} at the same time!`);\n      }\n      setMetadata(props, override.set);\n    }\n    if (override.remove) {\n      removeMetadata(props, override.remove, this._references);\n    }\n    if (override.add) {\n      addMetadata(props, override.add);\n    }\n    return new metadataClass(<any>props);\n  }\n}\n\nfunction removeMetadata(metadata: StringMap, remove: any, references: Map<any, string>) {\n  const removeObjects = new Set<string>();\n  for (const prop in remove) {\n    const removeValue = remove[prop];\n    if (Array.isArray(removeValue)) {\n      removeValue.forEach((value: any) => {\n        removeObjects.add(_propHashKey(prop, value, references));\n      });\n    } else {\n      removeObjects.add(_propHashKey(prop, removeValue, references));\n    }\n  }\n\n  for (const prop in metadata) {\n    const propValue = metadata[prop];\n    if (Array.isArray(propValue)) {\n      metadata[prop] = propValue.filter(\n          (value: any) => !removeObjects.has(_propHashKey(prop, value, references)));\n    } else {\n      if (removeObjects.has(_propHashKey(prop, propValue, references))) {\n        metadata[prop] = undefined;\n      }\n    }\n  }\n}\n\nfunction addMetadata(metadata: StringMap, add: any) {\n  for (const prop in add) {\n    const addValue = add[prop];\n    const propValue = metadata[prop];\n    if (propValue != null && Array.isArray(propValue)) {\n      metadata[prop] = propValue.concat(addValue);\n    } else {\n      metadata[prop] = addValue;\n    }\n  }\n}\n\nfunction setMetadata(metadata: StringMap, set: any) {\n  for (const prop in set) {\n    metadata[prop] = set[prop];\n  }\n}\n\nfunction _propHashKey(propName: any, propValue: any, references: Map<any, string>): string {\n  let nextObjectId = 0;\n  const objectIds = new Map<object, string>();\n  const replacer = (key: any, value: any) => {\n    if (value !== null && typeof value === 'object') {\n      if (objectIds.has(value)) {\n        return objectIds.get(value);\n      }\n      // Record an id for this object such that any later references use the object's id instead\n      // of the object itself, in order to break cyclic pointers in objects.\n      objectIds.set(value, `ɵobj#${nextObjectId++}`);\n\n      // The first time an object is seen the object itself is serialized.\n      return value;\n    } else if (typeof value === 'function') {\n      value = _serializeReference(value, references);\n    }\n    return value;\n  };\n\n  return `${propName}:${JSON.stringify(propValue, replacer)}`;\n}\n\nfunction _serializeReference(ref: any, references: Map<any, string>): string {\n  let id = references.get(ref);\n  if (!id) {\n    id = `${stringify(ref)}${_nextReferenceId++}`;\n    references.set(ref, id);\n  }\n  return id;\n}\n\n\nfunction _valueProps(obj: any): string[] {\n  const props: string[] = [];\n  // regular public props\n  Object.keys(obj).forEach((prop) => {\n    if (!prop.startsWith('_')) {\n      props.push(prop);\n    }\n  });\n\n  // getters\n  let proto = obj;\n  while (proto = Object.getPrototypeOf(proto)) {\n    Object.keys(proto).forEach((protoProp) => {\n      const desc = Object.getOwnPropertyDescriptor(proto, protoProp);\n      if (!protoProp.startsWith('_') && desc && 'get' in desc) {\n        props.push(protoProp);\n      }\n    });\n  }\n  return props;\n}\n"]}