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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
/** @type {WeakMap<object, WeakMap<object, object>>} */
const mergeCache = new WeakMap();
/** @type {WeakMap<object, Map<string, Map<string|number|boolean, object>>>} */
const setPropertyCache = new WeakMap();
const DELETE = Symbol("DELETE");
const DYNAMIC_INFO = Symbol("cleverMerge dynamic info");
/**
* Merges two given objects and caches the result to avoid computation if same objects passed as arguments again.
* @template T
* @template O
* @example
* // performs cleverMerge(first, second), stores the result in WeakMap and returns result
* cachedCleverMerge({a: 1}, {a: 2})
* {a: 2}
* // when same arguments passed, gets the result from WeakMap and returns it.
* cachedCleverMerge({a: 1}, {a: 2})
* {a: 2}
* @param {T} first first object
* @param {O} second second object
* @returns {T & O | T | O} merged object of first and second object
*/
const cachedCleverMerge = (first, second) => {
if (second === undefined) return first;
if (first === undefined) return second;
if (typeof second !== "object" || second === null) return second;
if (typeof first !== "object" || first === null) return first;
let innerCache = mergeCache.get(first);
if (innerCache === undefined) {
innerCache = new WeakMap();
mergeCache.set(first, innerCache);
}
const prevMerge = innerCache.get(second);
if (prevMerge !== undefined) return prevMerge;
const newMerge = _cleverMerge(first, second, true);
innerCache.set(second, newMerge);
return newMerge;
};
/**
* @template T
* @param {Partial<T>} obj object
* @param {string} property property
* @param {string|number|boolean} value assignment value
* @returns {T} new object
*/
const cachedSetProperty = (obj, property, value) => {
let mapByProperty = setPropertyCache.get(obj);
if (mapByProperty === undefined) {
mapByProperty = new Map();
setPropertyCache.set(obj, mapByProperty);
}
let mapByValue = mapByProperty.get(property);
if (mapByValue === undefined) {
mapByValue = new Map();
mapByProperty.set(property, mapByValue);
}
let result = mapByValue.get(value);
if (result) return result;
result = {
...obj,
[property]: value
};
mapByValue.set(value, result);
return result;
};
/**
* @typedef {Object} ObjectParsedPropertyEntry
* @property {any | undefined} base base value
* @property {string | undefined} byProperty the name of the selector property
* @property {Map<string, any>} byValues value depending on selector property, merged with base
*/
/**
* @typedef {Object} ParsedObject
* @property {Map<string, ObjectParsedPropertyEntry>} static static properties (key is property name)
* @property {{ byProperty: string, fn: Function } | undefined} dynamic dynamic part
*/
/** @type {WeakMap<object, ParsedObject>} */
const parseCache = new WeakMap();
/**
* @param {object} obj the object
* @returns {ParsedObject} parsed object
*/
const cachedParseObject = obj => {
const entry = parseCache.get(obj);
if (entry !== undefined) return entry;
const result = parseObject(obj);
parseCache.set(obj, result);
return result;
};
/**
* @param {object} obj the object
* @returns {ParsedObject} parsed object
*/
const parseObject = obj => {
const info = new Map();
let dynamicInfo;
const getInfo = p => {
const entry = info.get(p);
if (entry !== undefined) return entry;
const newEntry = {
base: undefined,
byProperty: undefined,
byValues: undefined
};
info.set(p, newEntry);
return newEntry;
};
for (const key of Object.keys(obj)) {
if (key.startsWith("by")) {
const byProperty = key;
const byObj = obj[byProperty];
if (typeof byObj === "object") {
for (const byValue of Object.keys(byObj)) {
const obj = byObj[byValue];
for (const key of Object.keys(obj)) {
const entry = getInfo(key);
if (entry.byProperty === undefined) {
entry.byProperty = byProperty;
entry.byValues = new Map();
} else if (entry.byProperty !== byProperty) {
throw new Error(
`${byProperty} and ${entry.byProperty} for a single property is not supported`
);
}
entry.byValues.set(byValue, obj[key]);
if (byValue === "default") {
for (const otherByValue of Object.keys(byObj)) {
if (!entry.byValues.has(otherByValue))
entry.byValues.set(otherByValue, undefined);
}
}
}
}
} else if (typeof byObj === "function") {
if (dynamicInfo === undefined) {
dynamicInfo = {
byProperty: key,
fn: byObj
};
} else {
throw new Error(
`${key} and ${dynamicInfo.byProperty} when both are functions is not supported`
);
}
} else {
const entry = getInfo(key);
entry.base = obj[key];
}
} else {
const entry = getInfo(key);
entry.base = obj[key];
}
}
return {
static: info,
dynamic: dynamicInfo
};
};
/**
* @param {Map<string, ObjectParsedPropertyEntry>} info static properties (key is property name)
* @param {{ byProperty: string, fn: Function } | undefined} dynamicInfo dynamic part
* @returns {object} the object
*/
const serializeObject = (info, dynamicInfo) => {
const obj = {};
// Setup byProperty structure
for (const entry of info.values()) {
if (entry.byProperty !== undefined) {
const byObj = (obj[entry.byProperty] = obj[entry.byProperty] || {});
for (const byValue of entry.byValues.keys()) {
byObj[byValue] = byObj[byValue] || {};
}
}
}
for (const [key, entry] of info) {
if (entry.base !== undefined) {
obj[key] = entry.base;
}
// Fill byProperty structure
if (entry.byProperty !== undefined) {
const byObj = (obj[entry.byProperty] = obj[entry.byProperty] || {});
for (const byValue of Object.keys(byObj)) {
const value = getFromByValues(entry.byValues, byValue);
if (value !== undefined) byObj[byValue][key] = value;
}
}
}
if (dynamicInfo !== undefined) {
obj[dynamicInfo.byProperty] = dynamicInfo.fn;
}
return obj;
};
const VALUE_TYPE_UNDEFINED = 0;
const VALUE_TYPE_ATOM = 1;
const VALUE_TYPE_ARRAY_EXTEND = 2;
const VALUE_TYPE_OBJECT = 3;
const VALUE_TYPE_DELETE = 4;
/**
* @param {any} value a single value
* @returns {VALUE_TYPE_UNDEFINED | VALUE_TYPE_ATOM | VALUE_TYPE_ARRAY_EXTEND | VALUE_TYPE_OBJECT | VALUE_TYPE_DELETE} value type
*/
const getValueType = value => {
if (value === undefined) {
return VALUE_TYPE_UNDEFINED;
} else if (value === DELETE) {
return VALUE_TYPE_DELETE;
} else if (Array.isArray(value)) {
if (value.lastIndexOf("...") !== -1) return VALUE_TYPE_ARRAY_EXTEND;
return VALUE_TYPE_ATOM;
} else if (
typeof value === "object" &&
value !== null &&
(!value.constructor || value.constructor === Object)
) {
return VALUE_TYPE_OBJECT;
}
return VALUE_TYPE_ATOM;
};
/**
* Merges two objects. Objects are deeply clever merged.
* Arrays might reference the old value with "...".
* Non-object values take preference over object values.
* @template T
* @template O
* @param {T} first first object
* @param {O} second second object
* @returns {T & O | T | O} merged object of first and second object
*/
const cleverMerge = (first, second) => {
if (second === undefined) return first;
if (first === undefined) return second;
if (typeof second !== "object" || second === null) return second;
if (typeof first !== "object" || first === null) return first;
return _cleverMerge(first, second, false);
};
/**
* Merges two objects. Objects are deeply clever merged.
* @param {object} first first object
* @param {object} second second object
* @param {boolean} internalCaching should parsing of objects and nested merges be cached
* @returns {object} merged object of first and second object
*/
const _cleverMerge = (first, second, internalCaching = false) => {
const firstObject = internalCaching
? cachedParseObject(first)
: parseObject(first);
const { static: firstInfo, dynamic: firstDynamicInfo } = firstObject;
// If the first argument has a dynamic part we modify the dynamic part to merge the second argument
if (firstDynamicInfo !== undefined) {
let { byProperty, fn } = firstDynamicInfo;
const fnInfo = fn[DYNAMIC_INFO];
if (fnInfo) {
second = internalCaching
? cachedCleverMerge(fnInfo[1], second)
: cleverMerge(fnInfo[1], second);
fn = fnInfo[0];
}
const newFn = (...args) => {
const fnResult = fn(...args);
return internalCaching
? cachedCleverMerge(fnResult, second)
: cleverMerge(fnResult, second);
};
newFn[DYNAMIC_INFO] = [fn, second];
return serializeObject(firstObject.static, { byProperty, fn: newFn });
}
// If the first part is static only, we merge the static parts and keep the dynamic part of the second argument
const secondObject = internalCaching
? cachedParseObject(second)
: parseObject(second);
const { static: secondInfo, dynamic: secondDynamicInfo } = secondObject;
/** @type {Map<string, ObjectParsedPropertyEntry>} */
const resultInfo = new Map();
for (const [key, firstEntry] of firstInfo) {
const secondEntry = secondInfo.get(key);
const entry =
secondEntry !== undefined
? mergeEntries(firstEntry, secondEntry, internalCaching)
: firstEntry;
resultInfo.set(key, entry);
}
for (const [key, secondEntry] of secondInfo) {
if (!firstInfo.has(key)) {
resultInfo.set(key, secondEntry);
}
}
return serializeObject(resultInfo, secondDynamicInfo);
};
/**
* @param {ObjectParsedPropertyEntry} firstEntry a
* @param {ObjectParsedPropertyEntry} secondEntry b
* @param {boolean} internalCaching should parsing of objects and nested merges be cached
* @returns {ObjectParsedPropertyEntry} new entry
*/
const mergeEntries = (firstEntry, secondEntry, internalCaching) => {
switch (getValueType(secondEntry.base)) {
case VALUE_TYPE_ATOM:
case VALUE_TYPE_DELETE:
// No need to consider firstEntry at all
// second value override everything
// = second.base + second.byProperty
return secondEntry;
case VALUE_TYPE_UNDEFINED:
if (!firstEntry.byProperty) {
// = first.base + second.byProperty
return {
base: firstEntry.base,
byProperty: secondEntry.byProperty,
byValues: secondEntry.byValues
};
} else if (firstEntry.byProperty !== secondEntry.byProperty) {
throw new Error(
`${firstEntry.byProperty} and ${secondEntry.byProperty} for a single property is not supported`
);
} else {
// = first.base + (first.byProperty + second.byProperty)
// need to merge first and second byValues
const newByValues = new Map(firstEntry.byValues);
for (const [key, value] of secondEntry.byValues) {
const firstValue = getFromByValues(firstEntry.byValues, key);
newByValues.set(
key,
mergeSingleValue(firstValue, value, internalCaching)
);
}
return {
base: firstEntry.base,
byProperty: firstEntry.byProperty,
byValues: newByValues
};
}
default: {
if (!firstEntry.byProperty) {
// The simple case
// = (first.base + second.base) + second.byProperty
return {
base: mergeSingleValue(
firstEntry.base,
secondEntry.base,
internalCaching
),
byProperty: secondEntry.byProperty,
byValues: secondEntry.byValues
};
}
let newBase;
const intermediateByValues = new Map(firstEntry.byValues);
for (const [key, value] of intermediateByValues) {
intermediateByValues.set(
key,
mergeSingleValue(value, secondEntry.base, internalCaching)
);
}
if (
Array.from(firstEntry.byValues.values()).every(value => {
const type = getValueType(value);
return type === VALUE_TYPE_ATOM || type === VALUE_TYPE_DELETE;
})
) {
// = (first.base + second.base) + ((first.byProperty + second.base) + second.byProperty)
newBase = mergeSingleValue(
firstEntry.base,
secondEntry.base,
internalCaching
);
} else {
// = first.base + ((first.byProperty (+default) + second.base) + second.byProperty)
newBase = firstEntry.base;
if (!intermediateByValues.has("default"))
intermediateByValues.set("default", secondEntry.base);
}
if (!secondEntry.byProperty) {
// = first.base + (first.byProperty + second.base)
return {
base: newBase,
byProperty: firstEntry.byProperty,
byValues: intermediateByValues
};
} else if (firstEntry.byProperty !== secondEntry.byProperty) {
throw new Error(
`${firstEntry.byProperty} and ${secondEntry.byProperty} for a single property is not supported`
);
}
const newByValues = new Map(intermediateByValues);
for (const [key, value] of secondEntry.byValues) {
const firstValue = getFromByValues(intermediateByValues, key);
newByValues.set(
key,
mergeSingleValue(firstValue, value, internalCaching)
);
}
return {
base: newBase,
byProperty: firstEntry.byProperty,
byValues: newByValues
};
}
}
};
/**
* @param {Map<string, any>} byValues all values
* @param {string} key value of the selector
* @returns {any | undefined} value
*/
const getFromByValues = (byValues, key) => {
if (key !== "default" && byValues.has(key)) {
return byValues.get(key);
}
return byValues.get("default");
};
/**
* @param {any} a value
* @param {any} b value
* @param {boolean} internalCaching should parsing of objects and nested merges be cached
* @returns {any} value
*/
const mergeSingleValue = (a, b, internalCaching) => {
const bType = getValueType(b);
const aType = getValueType(a);
switch (bType) {
case VALUE_TYPE_DELETE:
case VALUE_TYPE_ATOM:
return b;
case VALUE_TYPE_OBJECT: {
return aType !== VALUE_TYPE_OBJECT
? b
: internalCaching
? cachedCleverMerge(a, b)
: cleverMerge(a, b);
}
case VALUE_TYPE_UNDEFINED:
return a;
case VALUE_TYPE_ARRAY_EXTEND:
switch (
aType !== VALUE_TYPE_ATOM
? aType
: Array.isArray(a)
? VALUE_TYPE_ARRAY_EXTEND
: VALUE_TYPE_OBJECT
) {
case VALUE_TYPE_UNDEFINED:
return b;
case VALUE_TYPE_DELETE:
return b.filter(item => item !== "...");
case VALUE_TYPE_ARRAY_EXTEND: {
const newArray = [];
for (const item of b) {
if (item === "...") {
for (const item of a) {
newArray.push(item);
}
} else {
newArray.push(item);
}
}
return newArray;
}
case VALUE_TYPE_OBJECT:
return b.map(item => (item === "..." ? a : item));
default:
throw new Error("Not implemented");
}
default:
throw new Error("Not implemented");
}
};
/**
* @template T
* @param {T} obj the object
* @returns {T} the object without operations like "..." or DELETE
*/
const removeOperations = obj => {
const newObj = /** @type {T} */ ({});
for (const key of Object.keys(obj)) {
const value = obj[key];
const type = getValueType(value);
switch (type) {
case VALUE_TYPE_UNDEFINED:
case VALUE_TYPE_DELETE:
break;
case VALUE_TYPE_OBJECT:
newObj[key] = removeOperations(value);
break;
case VALUE_TYPE_ARRAY_EXTEND:
newObj[key] = value.filter(i => i !== "...");
break;
default:
newObj[key] = value;
break;
}
}
return newObj;
};
/**
* @template T
* @template {string} P
* @param {T} obj the object
* @param {P} byProperty the by description
* @param {...any} values values
* @returns {Omit<T, P>} object with merged byProperty
*/
const resolveByProperty = (obj, byProperty, ...values) => {
if (typeof obj !== "object" || obj === null || !(byProperty in obj)) {
return obj;
}
const { [byProperty]: _byValue, ..._remaining } = /** @type {object} */ (obj);
const remaining = /** @type {T} */ (_remaining);
const byValue = /** @type {Record<string, T> | function(...any[]): T} */ (
_byValue
);
if (typeof byValue === "object") {
const key = values[0];
if (key in byValue) {
return cachedCleverMerge(remaining, byValue[key]);
} else if ("default" in byValue) {
return cachedCleverMerge(remaining, byValue.default);
} else {
return /** @type {T} */ (remaining);
}
} else if (typeof byValue === "function") {
const result = byValue.apply(null, values);
return cachedCleverMerge(
remaining,
resolveByProperty(result, byProperty, ...values)
);
}
};
exports.cachedSetProperty = cachedSetProperty;
exports.cachedCleverMerge = cachedCleverMerge;
exports.cleverMerge = cleverMerge;
exports.resolveByProperty = resolveByProperty;
exports.removeOperations = removeOperations;
exports.DELETE = DELETE;