source: frontend/node_modules/webpack/lib/ConditionalInitFragment.js

/*
        MIT License http://www.opensource.org/licenses/mit-license.php
        Author Tobias Koppers @sokra
*/

"use strict";

const { ConcatSource, PrefixSource } = require("webpack-sources");
const InitFragment = require("./InitFragment");
const Template = require("./Template");
const { mergeRuntime } = require("./util/runtime");

/** @typedef {import("webpack-sources").Source} Source */
/** @typedef {import("./Generator").GenerateContext} GenerateContext */
/** @typedef {import("./util/runtime").RuntimeSpec} RuntimeSpec */

/**
 * Returns wrapped source.
 * @param {string} condition condition
 * @param {string | Source} source source
 * @returns {string | Source} wrapped source
 */
const wrapInCondition = (condition, source) => {
        if (typeof source === "string") {
                return Template.asString([
                        `if (${condition}) {`,
                        Template.indent(source),
                        "}",
                        ""
                ]);
        }
        return new ConcatSource(
                `if (${condition}) {\n`,
                new PrefixSource("\t", source),
                "}\n"
        );
};

/**
 * Represents ConditionalInitFragment.
 * @extends {InitFragment<GenerateContext>}
 */
class ConditionalInitFragment extends InitFragment {
        /**
         * Creates an instance of ConditionalInitFragment.
         * @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 | undefined} key unique key to avoid emitting the same initialization code twice
         * @param {RuntimeSpec | boolean} runtimeCondition in which runtime this fragment should be executed
         * @param {string | Source=} endContent the source code that will be included at the end of the module
         */
        constructor(
                content,
                stage,
                position,
                key,
                runtimeCondition = true,
                endContent = undefined
        ) {
                super(content, stage, position, key, endContent);
                this.runtimeCondition = runtimeCondition;
        }

        /**
         * Returns the source code that will be included as initialization code.
         * @param {GenerateContext} context context
         * @returns {string | Source | undefined} the source code that will be included as initialization code
         */
        getContent(context) {
                if (this.runtimeCondition === false || !this.content) return "";
                if (this.runtimeCondition === true) return this.content;
                const expr = context.runtimeTemplate.runtimeConditionExpression({
                        chunkGraph: context.chunkGraph,
                        runtimeRequirements: context.runtimeRequirements,
                        runtime: context.runtime,
                        runtimeCondition: this.runtimeCondition
                });
                if (expr === "true") return this.content;
                return wrapInCondition(expr, this.content);
        }

        /**
         * Returns the source code that will be included at the end of the module.
         * @param {GenerateContext} context context
         * @returns {string | Source | undefined} the source code that will be included at the end of the module
         */
        getEndContent(context) {
                if (this.runtimeCondition === false || !this.endContent) return "";
                if (this.runtimeCondition === true) return this.endContent;
                const expr = context.runtimeTemplate.runtimeConditionExpression({
                        chunkGraph: context.chunkGraph,
                        runtimeRequirements: context.runtimeRequirements,
                        runtime: context.runtime,
                        runtimeCondition: this.runtimeCondition
                });
                if (expr === "true") return this.endContent;
                return wrapInCondition(expr, this.endContent);
        }

        /**
         * Returns merged fragment.
         * @param {ConditionalInitFragment} other fragment to merge with
         * @returns {ConditionalInitFragment} merged fragment
         */
        merge(other) {
                if (this.runtimeCondition === true) return this;
                if (other.runtimeCondition === true) return other;
                if (this.runtimeCondition === false) return other;
                if (other.runtimeCondition === false) return this;
                const runtimeCondition = mergeRuntime(
                        this.runtimeCondition,
                        other.runtimeCondition
                );
                return new ConditionalInitFragment(
                        this.content,
                        this.stage,
                        this.position,
                        this.key,
                        runtimeCondition,
                        this.endContent
                );
        }
}

module.exports = ConditionalInitFragment;