@angular/core
Version:
Angular - the core framework
123 lines • 14 kB
JavaScript
/**
* @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 { ɵstringify as stringify } from '@angular/core';
var _nextReferenceId = 0;
var MetadataOverrider = /** @class */ (function () {
function MetadataOverrider() {
this._references = new Map();
}
/**
* Creates a new instance for the given metadata class
* based on an old instance and overrides.
*/
MetadataOverrider.prototype.overrideMetadata = function (metadataClass, oldMetadata, override) {
var props = {};
if (oldMetadata) {
_valueProps(oldMetadata).forEach(function (prop) { return 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);
};
return MetadataOverrider;
}());
export { MetadataOverrider };
function removeMetadata(metadata, remove, references) {
var removeObjects = new Set();
var _loop_1 = function (prop) {
var removeValue = remove[prop];
if (removeValue instanceof Array) {
removeValue.forEach(function (value) { removeObjects.add(_propHashKey(prop, value, references)); });
}
else {
removeObjects.add(_propHashKey(prop, removeValue, references));
}
};
for (var prop in remove) {
_loop_1(prop);
}
var _loop_2 = function (prop) {
var propValue = metadata[prop];
if (propValue instanceof Array) {
metadata[prop] = propValue.filter(function (value) { return !removeObjects.has(_propHashKey(prop, value, references)); });
}
else {
if (removeObjects.has(_propHashKey(prop, propValue, references))) {
metadata[prop] = undefined;
}
}
};
for (var prop in metadata) {
_loop_2(prop);
}
}
function addMetadata(metadata, add) {
for (var prop in add) {
var addValue = add[prop];
var propValue = metadata[prop];
if (propValue != null && propValue instanceof Array) {
metadata[prop] = propValue.concat(addValue);
}
else {
metadata[prop] = addValue;
}
}
}
function setMetadata(metadata, set) {
for (var prop in set) {
metadata[prop] = set[prop];
}
}
function _propHashKey(propName, propValue, references) {
var replacer = function (key, value) {
if (typeof value === 'function') {
value = _serializeReference(value, references);
}
return value;
};
return propName + ":" + JSON.stringify(propValue, replacer);
}
function _serializeReference(ref, references) {
var id = references.get(ref);
if (!id) {
id = "" + stringify(ref) + _nextReferenceId++;
references.set(ref, id);
}
return id;
}
function _valueProps(obj) {
var props = [];
// regular public props
Object.keys(obj).forEach(function (prop) {
if (!prop.startsWith('_')) {
props.push(prop);
}
});
// getters
var proto = obj;
while (proto = Object.getPrototypeOf(proto)) {
Object.keys(proto).forEach(function (protoProp) {
var desc = Object.getOwnPropertyDescriptor(proto, protoProp);
if (!protoProp.startsWith('_') && desc && 'get' in desc) {
props.push(protoProp);
}
});
}
return props;
}
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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';\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 ${stringify(metadataClass)} at the same time!`);\n      }\n      setMetadata(props, override.set);\n    }\n    if (override.remove) {\n      removeMetadata(props, override.remove, this._references);\n    }\n    if (override.add) {\n      addMetadata(props, override.add);\n    }\n    return new metadataClass(<any>props);\n  }\n}\n\nfunction removeMetadata(metadata: StringMap, remove: any, references: Map<any, string>) {\n  const removeObjects = new Set<string>();\n  for (const prop in remove) {\n    const removeValue = remove[prop];\n    if (removeValue instanceof Array) {\n      removeValue.forEach(\n          (value: any) => { removeObjects.add(_propHashKey(prop, value, references)); });\n    } else {\n      removeObjects.add(_propHashKey(prop, removeValue, references));\n    }\n  }\n\n  for (const prop in metadata) {\n    const propValue = metadata[prop];\n    if (propValue instanceof Array) {\n      metadata[prop] = propValue.filter(\n          (value: any) => !removeObjects.has(_propHashKey(prop, value, references)));\n    } else {\n      if (removeObjects.has(_propHashKey(prop, propValue, references))) {\n        metadata[prop] = undefined;\n      }\n    }\n  }\n}\n\nfunction addMetadata(metadata: StringMap, add: any) {\n  for (const prop in add) {\n    const addValue = add[prop];\n    const propValue = metadata[prop];\n    if (propValue != null && propValue instanceof Array) {\n      metadata[prop] = propValue.concat(addValue);\n    } else {\n      metadata[prop] = addValue;\n    }\n  }\n}\n\nfunction setMetadata(metadata: StringMap, set: any) {\n  for (const prop in set) {\n    metadata[prop] = set[prop];\n  }\n}\n\nfunction _propHashKey(propName: any, propValue: any, references: Map<any, string>): string {\n  const replacer = (key: any, value: any) => {\n    if (typeof value === 'function') {\n      value = _serializeReference(value, references);\n    }\n    return value;\n  };\n\n  return `${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"]}