source: imaps-frontend/node_modules/webpack/lib/InitFragment.js

/*
        MIT License http://www.opensource.org/licenses/mit-license.php
        Author Florent Cailhol @ooflorent
*/

"use strict";

const { ConcatSource } = require("webpack-sources");
const makeSerializable = require("./util/makeSerializable");

/** @typedef {import("webpack-sources").Source} Source */
/** @typedef {import("./Generator").GenerateContext} GenerateContext */
/** @typedef {import("./serialization/ObjectMiddleware").ObjectDeserializerContext} ObjectDeserializerContext */
/** @typedef {import("./serialization/ObjectMiddleware").ObjectSerializerContext} ObjectSerializerContext */

/**
 * @template T
 * @param {InitFragment<T>} fragment the init fragment
 * @param {number} index index
 * @returns {[InitFragment<T>, number]} tuple with both
 */
const extractFragmentIndex = (fragment, index) => [fragment, index];

/**
 * @template T
 * @param {[InitFragment<T>, number]} a first pair
 * @param {[InitFragment<T>, number]} b second pair
 * @returns {number} sort value
 */
const sortFragmentWithIndex = ([a, i], [b, j]) => {
        const stageCmp = a.stage - b.stage;
        if (stageCmp !== 0) return stageCmp;
        const positionCmp = a.position - b.position;
        if (positionCmp !== 0) return positionCmp;
        return i - j;
};

/**
 * @template GenerateContext
 */
class InitFragment {
        /**
         * @param {string | Source | undefined} content the source code that will be included as initialization code
         * @param {number} stage category of initialization code (contribute to order)
         * @param {number} position position in the category (contribute to order)
         * @param {string=} key unique key to avoid emitting the same initialization code twice
         * @param {string | Source=} endContent the source code that will be included at the end of the module
         */
        constructor(content, stage, position, key, endContent) {
                this.content = content;
                this.stage = stage;
                this.position = position;
                this.key = key;
                this.endContent = endContent;
        }

        /**
         * @param {GenerateContext} context context
         * @returns {string | Source | undefined} the source code that will be included as initialization code
         */
        getContent(context) {
                return this.content;
        }

        /**
         * @param {GenerateContext} context context
         * @returns {string|Source=} the source code that will be included at the end of the module
         */
        getEndContent(context) {
                return this.endContent;
        }

        /**
         * @template Context
         * @template T
         * @param {Source} source sources
         * @param {InitFragment<T>[]} initFragments init fragments
         * @param {Context} context context
         * @returns {Source} source
         */
        static addToSource(source, initFragments, context) {
                if (initFragments.length > 0) {
                        // Sort fragments by position. If 2 fragments have the same position,
                        // use their index.
                        const sortedFragments = initFragments
                                .map(extractFragmentIndex)
                                .sort(sortFragmentWithIndex);

                        // Deduplicate fragments. If a fragment has no key, it is always included.
                        const keyedFragments = new Map();
                        for (const [fragment] of sortedFragments) {
                                if (
                                        typeof (
                                                /** @type {InitFragment<T> & { mergeAll?: (fragments: InitFragment<Context>[]) => InitFragment<Context>[] }} */
                                                (fragment).mergeAll
                                        ) === "function"
                                ) {
                                        if (!fragment.key) {
                                                throw new Error(
                                                        `InitFragment with mergeAll function must have a valid key: ${fragment.constructor.name}`
                                                );
                                        }
                                        const oldValue = keyedFragments.get(fragment.key);
                                        if (oldValue === undefined) {
                                                keyedFragments.set(fragment.key, fragment);
                                        } else if (Array.isArray(oldValue)) {
                                                oldValue.push(fragment);
                                        } else {
                                                keyedFragments.set(fragment.key, [oldValue, fragment]);
                                        }
                                        continue;
                                } else if (typeof fragment.merge === "function") {
                                        const oldValue = keyedFragments.get(fragment.key);
                                        if (oldValue !== undefined) {
                                                keyedFragments.set(fragment.key, fragment.merge(oldValue));
                                                continue;
                                        }
                                }
                                keyedFragments.set(fragment.key || Symbol("fragment key"), fragment);
                        }

                        const concatSource = new ConcatSource();
                        const endContents = [];
                        for (let fragment of keyedFragments.values()) {
                                if (Array.isArray(fragment)) {
                                        fragment = fragment[0].mergeAll(fragment);
                                }
                                concatSource.add(fragment.getContent(context));
                                const endContent = fragment.getEndContent(context);
                                if (endContent) {
                                        endContents.push(endContent);
                                }
                        }

                        concatSource.add(source);
                        for (const content of endContents.reverse()) {
                                concatSource.add(content);
                        }
                        return concatSource;
                }
                return source;
        }

        /**
         * @param {ObjectSerializerContext} context context
         */
        serialize(context) {
                const { write } = context;

                write(this.content);
                write(this.stage);
                write(this.position);
                write(this.key);
                write(this.endContent);
        }

        /**
         * @param {ObjectDeserializerContext} context context
         */
        deserialize(context) {
                const { read } = context;

                this.content = read();
                this.stage = read();
                this.position = read();
                this.key = read();
                this.endContent = read();
        }
}

makeSerializable(InitFragment, "webpack/lib/InitFragment");

InitFragment.prototype.merge =
        /** @type {TODO} */
        (undefined);

InitFragment.STAGE_CONSTANTS = 10;
InitFragment.STAGE_ASYNC_BOUNDARY = 20;
InitFragment.STAGE_HARMONY_EXPORTS = 30;
InitFragment.STAGE_HARMONY_IMPORTS = 40;
InitFragment.STAGE_PROVIDES = 50;
InitFragment.STAGE_ASYNC_DEPENDENCIES = 60;
InitFragment.STAGE_ASYNC_HARMONY_IMPORTS = 70;

module.exports = InitFragment;