aws-cdk
Version:
CDK Toolkit, the command line tool for CDK apps
183 lines • 18.3 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.applyDefaults = applyDefaults;
exports.isEmpty = isEmpty;
exports.deepClone = deepClone;
exports.mapObject = mapObject;
exports.makeObject = makeObject;
exports.deepGet = deepGet;
exports.deepSet = deepSet;
exports.deepMerge = deepMerge;
exports.splitBySize = splitBySize;
const types_1 = require("./types");
const error_1 = require("../toolkit/error");
/**
* Return a new object by adding missing keys into another object
*/
function applyDefaults(hash, defaults) {
const result = {};
Object.keys(hash).forEach(k => result[k] = hash[k]);
Object.keys(defaults)
.filter(k => !(k in result))
.forEach(k => result[k] = defaults[k]);
return result;
}
/**
* Return whether the given parameter is an empty object or empty list.
*/
function isEmpty(x) {
if (x == null) {
return false;
}
if ((0, types_1.isArray)(x)) {
return x.length === 0;
}
return Object.keys(x).length === 0;
}
/**
* Deep clone a tree of objects, lists or scalars
*
* Does not support cycles.
*/
function deepClone(x) {
if (typeof x === 'undefined') {
return undefined;
}
if (x === null) {
return null;
}
if ((0, types_1.isArray)(x)) {
return x.map(deepClone);
}
if ((0, types_1.isObject)(x)) {
return makeObject(mapObject(x, (k, v) => [k, deepClone(v)]));
}
return x;
}
/**
* Map over an object, treating it as a dictionary
*/
function mapObject(x, fn) {
const ret = [];
Object.keys(x).forEach(key => {
ret.push(fn(key, x[key]));
});
return ret;
}
/**
* Construct an object from a list of (k, v) pairs
*/
function makeObject(pairs) {
const ret = {};
for (const pair of pairs) {
ret[pair[0]] = pair[1];
}
return ret;
}
/**
* Deep get a value from a tree of nested objects
*
* Returns undefined if any part of the path was unset or
* not an object.
*/
function deepGet(x, path) {
path = path.slice();
while (path.length > 0 && (0, types_1.isObject)(x)) {
const key = path.shift();
x = x[key];
}
return path.length === 0 ? x : undefined;
}
/**
* Deep set a value in a tree of nested objects
*
* Throws an error if any part of the path is not an object.
*/
function deepSet(x, path, value) {
path = path.slice();
if (path.length === 0) {
throw new error_1.ToolkitError('Path may not be empty');
}
while (path.length > 1 && (0, types_1.isObject)(x)) {
const key = path.shift();
if (!(key in x)) {
x[key] = {};
}
x = x[key];
}
if (!(0, types_1.isObject)(x)) {
throw new error_1.ToolkitError(`Expected an object, got '${x}'`);
}
if (value !== undefined) {
x[path[0]] = value;
}
else {
delete x[path[0]];
}
}
/**
* Recursively merge objects together
*
* The leftmost object is mutated and returned. Arrays are not merged
* but overwritten just like scalars.
*
* If an object is merged into a non-object, the non-object is lost.
*/
function deepMerge(...objects) {
function mergeOne(target, source) {
for (const key of Object.keys(source)) {
if (key === '__proto__' || key === 'constructor') {
continue;
}
const value = source[key];
if ((0, types_1.isObject)(value)) {
if (!(0, types_1.isObject)(target[key])) {
target[key] = {};
} // Overwrite on purpose
mergeOne(target[key], value);
}
else if (typeof value !== 'undefined') {
target[key] = value;
}
}
}
const others = objects.filter(x => x != null);
if (others.length === 0) {
return {};
}
const into = others.splice(0, 1)[0];
others.forEach(other => mergeOne(into, other));
return into;
}
/**
* Splits the given object into two, such that:
*
* 1. The size of the first object (after stringified in UTF-8) is less than or equal to the provided size limit.
* 2. Merging the two objects results in the original one.
*/
function splitBySize(data, maxSizeBytes) {
if (maxSizeBytes < 2) {
// It's impossible to fit anything in the first object
return [undefined, data];
}
const entries = Object.entries(data);
return recurse(0, 0);
function recurse(index, runningTotalSize) {
if (index >= entries.length) {
// Everything fits in the first object
return [data, undefined];
}
const size = runningTotalSize + entrySize(entries[index]);
return (size > maxSizeBytes) ? cutAt(index) : recurse(index + 1, size);
}
function entrySize(entry) {
return Buffer.byteLength(JSON.stringify(Object.fromEntries([entry])));
}
function cutAt(index) {
return [
Object.fromEntries(entries.slice(0, index)),
Object.fromEntries(entries.slice(index)),
];
}
}
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{ isArray, isObject, Obj } from './types';\nimport { ToolkitError } from '../toolkit/error';\n\n/**\n * Return a new object by adding missing keys into another object\n */\nexport function applyDefaults(hash: any, defaults: any) {\n  const result: any = { };\n\n  Object.keys(hash).forEach(k => result[k] = hash[k]);\n\n  Object.keys(defaults)\n    .filter(k => !(k in result))\n    .forEach(k => result[k] = defaults[k]);\n\n  return result;\n}\n\n/**\n * Return whether the given parameter is an empty object or empty list.\n */\nexport function isEmpty(x: any) {\n  if (x == null) { return false; }\n  if (isArray(x)) { return x.length === 0; }\n  return Object.keys(x).length === 0;\n}\n\n/**\n * Deep clone a tree of objects, lists or scalars\n *\n * Does not support cycles.\n */\nexport function deepClone(x: any): any {\n  if (typeof x === 'undefined') { return undefined; }\n  if (x === null) { return null; }\n  if (isArray(x)) { return x.map(deepClone); }\n  if (isObject(x)) { return makeObject(mapObject(x, (k, v) => [k, deepClone(v)] as [string, any])); }\n  return x;\n}\n\n/**\n * Map over an object, treating it as a dictionary\n */\nexport function mapObject<T, U>(x: Obj<T>, fn: (key: string, value: T) => U): U[] {\n  const ret: U[] = [];\n  Object.keys(x).forEach(key => {\n    ret.push(fn(key, x[key]));\n  });\n  return ret;\n}\n\n/**\n * Construct an object from a list of (k, v) pairs\n */\nexport function makeObject<T>(pairs: Array<[string, T]>): Obj<T> {\n  const ret: Obj<T> = {};\n  for (const pair of pairs) {\n    ret[pair[0]] = pair[1];\n  }\n  return ret;\n}\n\n/**\n * Deep get a value from a tree of nested objects\n *\n * Returns undefined if any part of the path was unset or\n * not an object.\n */\nexport function deepGet(x: any, path: string[]): any {\n  path = path.slice();\n\n  while (path.length > 0 && isObject(x)) {\n    const key = path.shift()!;\n    x = x[key];\n  }\n  return path.length === 0 ? x : undefined;\n}\n\n/**\n * Deep set a value in a tree of nested objects\n *\n * Throws an error if any part of the path is not an object.\n */\nexport function deepSet(x: any, path: string[], value: any) {\n  path = path.slice();\n\n  if (path.length === 0) {\n    throw new ToolkitError('Path may not be empty');\n  }\n\n  while (path.length > 1 && isObject(x)) {\n    const key = path.shift()!;\n    if (!(key in x)) { x[key] = {}; }\n    x = x[key];\n  }\n\n  if (!isObject(x)) {\n    throw new ToolkitError(`Expected an object, got '${x}'`);\n  }\n\n  if (value !== undefined) {\n    x[path[0]] = value;\n  } else {\n    delete x[path[0]];\n  }\n}\n\n/**\n * Recursively merge objects together\n *\n * The leftmost object is mutated and returned. Arrays are not merged\n * but overwritten just like scalars.\n *\n * If an object is merged into a non-object, the non-object is lost.\n */\nexport function deepMerge(...objects: Array<Obj<any> | undefined>) {\n  function mergeOne(target: Obj<any>, source: Obj<any>) {\n    for (const key of Object.keys(source)) {\n      if (key === '__proto__' || key === 'constructor') {\n        continue;\n      }\n\n      const value = source[key];\n\n      if (isObject(value)) {\n        if (!isObject(target[key])) { target[key] = {}; } // Overwrite on purpose\n        mergeOne(target[key], value);\n      } else if (typeof value !== 'undefined') {\n        target[key] = value;\n      }\n    }\n  }\n\n  const others = objects.filter(x => x != null) as Array<Obj<any>>;\n\n  if (others.length === 0) { return {}; }\n  const into = others.splice(0, 1)[0];\n\n  others.forEach(other => mergeOne(into, other));\n  return into;\n}\n\n/**\n * Splits the given object into two, such that:\n *\n * 1. The size of the first object (after stringified in UTF-8) is less than or equal to the provided size limit.\n * 2. Merging the two objects results in the original one.\n */\nexport function splitBySize(data: any, maxSizeBytes: number): [any, any] {\n  if (maxSizeBytes < 2) {\n    // It's impossible to fit anything in the first object\n    return [undefined, data];\n  }\n  const entries = Object.entries(data);\n  return recurse(0, 0);\n\n  function recurse(index: number, runningTotalSize: number): [any, any] {\n    if (index >= entries.length) {\n      // Everything fits in the first object\n      return [data, undefined];\n    }\n\n    const size = runningTotalSize + entrySize(entries[index]);\n    return (size > maxSizeBytes) ? cutAt(index) : recurse(index + 1, size);\n  }\n\n  function entrySize(entry: [string, unknown]) {\n    return Buffer.byteLength(JSON.stringify(Object.fromEntries([entry])));\n  }\n\n  function cutAt(index: number): [any, any] {\n    return [\n      Object.fromEntries(entries.slice(0, index)),\n      Object.fromEntries(entries.slice(index)),\n    ];\n  }\n}\n"]}