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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const util = require("util");
const SortableSet = require("./util/SortableSet");
const {
compareLocations,
compareChunks,
compareIterables
} = require("./util/comparators");
/** @typedef {import("./AsyncDependenciesBlock")} AsyncDependenciesBlock */
/** @typedef {import("./Chunk")} Chunk */
/** @typedef {import("./ChunkGraph")} ChunkGraph */
/** @typedef {import("./Dependency").DependencyLocation} DependencyLocation */
/** @typedef {import("./Entrypoint")} Entrypoint */
/** @typedef {import("./Module")} Module */
/** @typedef {import("./ModuleGraph")} ModuleGraph */
/** @typedef {{id: number}} HasId */
/** @typedef {{module: Module, loc: DependencyLocation, request: string}} OriginRecord */
/**
* @typedef {Object} RawChunkGroupOptions
* @property {number=} preloadOrder
* @property {number=} prefetchOrder
*/
/** @typedef {RawChunkGroupOptions & { name?: string }} ChunkGroupOptions */
let debugId = 5000;
/**
* @template T
* @param {SortableSet<T>} set set to convert to array.
* @returns {T[]} the array format of existing set
*/
const getArray = set => Array.from(set);
/**
* A convenience method used to sort chunks based on their id's
* @param {ChunkGroup} a first sorting comparator
* @param {ChunkGroup} b second sorting comparator
* @returns {1|0|-1} a sorting index to determine order
*/
const sortById = (a, b) => {
if (a.id < b.id) return -1;
if (b.id < a.id) return 1;
return 0;
};
/**
* @param {OriginRecord} a the first comparator in sort
* @param {OriginRecord} b the second comparator in sort
* @returns {1|-1|0} returns sorting order as index
*/
const sortOrigin = (a, b) => {
const aIdent = a.module ? a.module.identifier() : "";
const bIdent = b.module ? b.module.identifier() : "";
if (aIdent < bIdent) return -1;
if (aIdent > bIdent) return 1;
return compareLocations(a.loc, b.loc);
};
class ChunkGroup {
/**
* Creates an instance of ChunkGroup.
* @param {string|ChunkGroupOptions=} options chunk group options passed to chunkGroup
*/
constructor(options) {
if (typeof options === "string") {
options = { name: options };
} else if (!options) {
options = { name: undefined };
}
/** @type {number} */
this.groupDebugId = debugId++;
this.options = options;
/** @type {SortableSet<ChunkGroup>} */
this._children = new SortableSet(undefined, sortById);
/** @type {SortableSet<ChunkGroup>} */
this._parents = new SortableSet(undefined, sortById);
/** @type {SortableSet<ChunkGroup>} */
this._asyncEntrypoints = new SortableSet(undefined, sortById);
this._blocks = new SortableSet();
/** @type {Chunk[]} */
this.chunks = [];
/** @type {OriginRecord[]} */
this.origins = [];
/** Indices in top-down order */
/** @private @type {Map<Module, number>} */
this._modulePreOrderIndices = new Map();
/** Indices in bottom-up order */
/** @private @type {Map<Module, number>} */
this._modulePostOrderIndices = new Map();
/** @type {number} */
this.index = undefined;
}
/**
* when a new chunk is added to a chunkGroup, addingOptions will occur.
* @param {ChunkGroupOptions} options the chunkGroup options passed to addOptions
* @returns {void}
*/
addOptions(options) {
for (const key of Object.keys(options)) {
if (this.options[key] === undefined) {
this.options[key] = options[key];
} else if (this.options[key] !== options[key]) {
if (key.endsWith("Order")) {
this.options[key] = Math.max(this.options[key], options[key]);
} else {
throw new Error(
`ChunkGroup.addOptions: No option merge strategy for ${key}`
);
}
}
}
}
/**
* returns the name of current ChunkGroup
* @returns {string|undefined} returns the ChunkGroup name
*/
get name() {
return this.options.name;
}
/**
* sets a new name for current ChunkGroup
* @param {string} value the new name for ChunkGroup
* @returns {void}
*/
set name(value) {
this.options.name = value;
}
/* istanbul ignore next */
/**
* get a uniqueId for ChunkGroup, made up of its member Chunk debugId's
* @returns {string} a unique concatenation of chunk debugId's
*/
get debugId() {
return Array.from(this.chunks, x => x.debugId).join("+");
}
/**
* get a unique id for ChunkGroup, made up of its member Chunk id's
* @returns {string} a unique concatenation of chunk ids
*/
get id() {
return Array.from(this.chunks, x => x.id).join("+");
}
/**
* Performs an unshift of a specific chunk
* @param {Chunk} chunk chunk being unshifted
* @returns {boolean} returns true if attempted chunk shift is accepted
*/
unshiftChunk(chunk) {
const oldIdx = this.chunks.indexOf(chunk);
if (oldIdx > 0) {
this.chunks.splice(oldIdx, 1);
this.chunks.unshift(chunk);
} else if (oldIdx < 0) {
this.chunks.unshift(chunk);
return true;
}
return false;
}
/**
* inserts a chunk before another existing chunk in group
* @param {Chunk} chunk Chunk being inserted
* @param {Chunk} before Placeholder/target chunk marking new chunk insertion point
* @returns {boolean} return true if insertion was successful
*/
insertChunk(chunk, before) {
const oldIdx = this.chunks.indexOf(chunk);
const idx = this.chunks.indexOf(before);
if (idx < 0) {
throw new Error("before chunk not found");
}
if (oldIdx >= 0 && oldIdx > idx) {
this.chunks.splice(oldIdx, 1);
this.chunks.splice(idx, 0, chunk);
} else if (oldIdx < 0) {
this.chunks.splice(idx, 0, chunk);
return true;
}
return false;
}
/**
* add a chunk into ChunkGroup. Is pushed on or prepended
* @param {Chunk} chunk chunk being pushed into ChunkGroupS
* @returns {boolean} returns true if chunk addition was successful.
*/
pushChunk(chunk) {
const oldIdx = this.chunks.indexOf(chunk);
if (oldIdx >= 0) {
return false;
}
this.chunks.push(chunk);
return true;
}
/**
* @param {Chunk} oldChunk chunk to be replaced
* @param {Chunk} newChunk New chunk that will be replaced with
* @returns {boolean} returns true if the replacement was successful
*/
replaceChunk(oldChunk, newChunk) {
const oldIdx = this.chunks.indexOf(oldChunk);
if (oldIdx < 0) return false;
const newIdx = this.chunks.indexOf(newChunk);
if (newIdx < 0) {
this.chunks[oldIdx] = newChunk;
return true;
}
if (newIdx < oldIdx) {
this.chunks.splice(oldIdx, 1);
return true;
} else if (newIdx !== oldIdx) {
this.chunks[oldIdx] = newChunk;
this.chunks.splice(newIdx, 1);
return true;
}
}
/**
* @param {Chunk} chunk chunk to remove
* @returns {boolean} returns true if chunk was removed
*/
removeChunk(chunk) {
const idx = this.chunks.indexOf(chunk);
if (idx >= 0) {
this.chunks.splice(idx, 1);
return true;
}
return false;
}
/**
* @returns {boolean} true, when this chunk group will be loaded on initial page load
*/
isInitial() {
return false;
}
/**
* @param {ChunkGroup} group chunk group to add
* @returns {boolean} returns true if chunk group was added
*/
addChild(group) {
const size = this._children.size;
this._children.add(group);
return size !== this._children.size;
}
/**
* @returns {ChunkGroup[]} returns the children of this group
*/
getChildren() {
return this._children.getFromCache(getArray);
}
getNumberOfChildren() {
return this._children.size;
}
get childrenIterable() {
return this._children;
}
/**
* @param {ChunkGroup} group the chunk group to remove
* @returns {boolean} returns true if the chunk group was removed
*/
removeChild(group) {
if (!this._children.has(group)) {
return false;
}
this._children.delete(group);
group.removeParent(this);
return true;
}
/**
* @param {ChunkGroup} parentChunk the parent group to be added into
* @returns {boolean} returns true if this chunk group was added to the parent group
*/
addParent(parentChunk) {
if (!this._parents.has(parentChunk)) {
this._parents.add(parentChunk);
return true;
}
return false;
}
/**
* @returns {ChunkGroup[]} returns the parents of this group
*/
getParents() {
return this._parents.getFromCache(getArray);
}
getNumberOfParents() {
return this._parents.size;
}
/**
* @param {ChunkGroup} parent the parent group
* @returns {boolean} returns true if the parent group contains this group
*/
hasParent(parent) {
return this._parents.has(parent);
}
get parentsIterable() {
return this._parents;
}
/**
* @param {ChunkGroup} chunkGroup the parent group
* @returns {boolean} returns true if this group has been removed from the parent
*/
removeParent(chunkGroup) {
if (this._parents.delete(chunkGroup)) {
chunkGroup.removeChild(this);
return true;
}
return false;
}
/**
* @param {Entrypoint} entrypoint entrypoint to add
* @returns {boolean} returns true if entrypoint was added
*/
addAsyncEntrypoint(entrypoint) {
const size = this._asyncEntrypoints.size;
this._asyncEntrypoints.add(entrypoint);
return size !== this._asyncEntrypoints.size;
}
get asyncEntrypointsIterable() {
return this._asyncEntrypoints;
}
/**
* @returns {Array} an array containing the blocks
*/
getBlocks() {
return this._blocks.getFromCache(getArray);
}
getNumberOfBlocks() {
return this._blocks.size;
}
hasBlock(block) {
return this._blocks.has(block);
}
/**
* @returns {Iterable<AsyncDependenciesBlock>} blocks
*/
get blocksIterable() {
return this._blocks;
}
/**
* @param {AsyncDependenciesBlock} block a block
* @returns {boolean} false, if block was already added
*/
addBlock(block) {
if (!this._blocks.has(block)) {
this._blocks.add(block);
return true;
}
return false;
}
/**
* @param {Module} module origin module
* @param {DependencyLocation} loc location of the reference in the origin module
* @param {string} request request name of the reference
* @returns {void}
*/
addOrigin(module, loc, request) {
this.origins.push({
module,
loc,
request
});
}
/**
* @returns {string[]} the files contained this chunk group
*/
getFiles() {
const files = new Set();
for (const chunk of this.chunks) {
for (const file of chunk.files) {
files.add(file);
}
}
return Array.from(files);
}
/**
* @returns {void}
*/
remove() {
// cleanup parents
for (const parentChunkGroup of this._parents) {
// remove this chunk from its parents
parentChunkGroup._children.delete(this);
// cleanup "sub chunks"
for (const chunkGroup of this._children) {
/**
* remove this chunk as "intermediary" and connect
* it "sub chunks" and parents directly
*/
// add parent to each "sub chunk"
chunkGroup.addParent(parentChunkGroup);
// add "sub chunk" to parent
parentChunkGroup.addChild(chunkGroup);
}
}
/**
* we need to iterate again over the children
* to remove this from the child's parents.
* This can not be done in the above loop
* as it is not guaranteed that `this._parents` contains anything.
*/
for (const chunkGroup of this._children) {
// remove this as parent of every "sub chunk"
chunkGroup._parents.delete(this);
}
// remove chunks
for (const chunk of this.chunks) {
chunk.removeGroup(this);
}
}
sortItems() {
this.origins.sort(sortOrigin);
}
/**
* Sorting predicate which allows current ChunkGroup to be compared against another.
* Sorting values are based off of number of chunks in ChunkGroup.
*
* @param {ChunkGraph} chunkGraph the chunk graph
* @param {ChunkGroup} otherGroup the chunkGroup to compare this against
* @returns {-1|0|1} sort position for comparison
*/
compareTo(chunkGraph, otherGroup) {
if (this.chunks.length > otherGroup.chunks.length) return -1;
if (this.chunks.length < otherGroup.chunks.length) return 1;
return compareIterables(compareChunks(chunkGraph))(
this.chunks,
otherGroup.chunks
);
}
/**
* @param {ModuleGraph} moduleGraph the module graph
* @param {ChunkGraph} chunkGraph the chunk graph
* @returns {Record<string, ChunkGroup[]>} mapping from children type to ordered list of ChunkGroups
*/
getChildrenByOrders(moduleGraph, chunkGraph) {
/** @type {Map<string, {order: number, group: ChunkGroup}[]>} */
const lists = new Map();
for (const childGroup of this._children) {
for (const key of Object.keys(childGroup.options)) {
if (key.endsWith("Order")) {
const name = key.substr(0, key.length - "Order".length);
let list = lists.get(name);
if (list === undefined) {
lists.set(name, (list = []));
}
list.push({
order: childGroup.options[key],
group: childGroup
});
}
}
}
/** @type {Record<string, ChunkGroup[]>} */
const result = Object.create(null);
for (const [name, list] of lists) {
list.sort((a, b) => {
const cmp = b.order - a.order;
if (cmp !== 0) return cmp;
return a.group.compareTo(chunkGraph, b.group);
});
result[name] = list.map(i => i.group);
}
return result;
}
/**
* Sets the top-down index of a module in this ChunkGroup
* @param {Module} module module for which the index should be set
* @param {number} index the index of the module
* @returns {void}
*/
setModulePreOrderIndex(module, index) {
this._modulePreOrderIndices.set(module, index);
}
/**
* Gets the top-down index of a module in this ChunkGroup
* @param {Module} module the module
* @returns {number} index
*/
getModulePreOrderIndex(module) {
return this._modulePreOrderIndices.get(module);
}
/**
* Sets the bottom-up index of a module in this ChunkGroup
* @param {Module} module module for which the index should be set
* @param {number} index the index of the module
* @returns {void}
*/
setModulePostOrderIndex(module, index) {
this._modulePostOrderIndices.set(module, index);
}
/**
* Gets the bottom-up index of a module in this ChunkGroup
* @param {Module} module the module
* @returns {number} index
*/
getModulePostOrderIndex(module) {
return this._modulePostOrderIndices.get(module);
}
/* istanbul ignore next */
checkConstraints() {
const chunk = this;
for (const child of chunk._children) {
if (!child._parents.has(chunk)) {
throw new Error(
`checkConstraints: child missing parent ${chunk.debugId} -> ${child.debugId}`
);
}
}
for (const parentChunk of chunk._parents) {
if (!parentChunk._children.has(chunk)) {
throw new Error(
`checkConstraints: parent missing child ${parentChunk.debugId} <- ${chunk.debugId}`
);
}
}
}
}
ChunkGroup.prototype.getModuleIndex = util.deprecate(
ChunkGroup.prototype.getModulePreOrderIndex,
"ChunkGroup.getModuleIndex was renamed to getModulePreOrderIndex",
"DEP_WEBPACK_CHUNK_GROUP_GET_MODULE_INDEX"
);
ChunkGroup.prototype.getModuleIndex2 = util.deprecate(
ChunkGroup.prototype.getModulePostOrderIndex,
"ChunkGroup.getModuleIndex2 was renamed to getModulePostOrderIndex",
"DEP_WEBPACK_CHUNK_GROUP_GET_MODULE_INDEX_2"
);
module.exports = ChunkGroup;