mirror of https://github.com/webpack/webpack.git
121 lines
3.7 KiB
JavaScript
121 lines
3.7 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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const { ConcatSource, PrefixSource } = require("webpack-sources");
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const InitFragment = require("./InitFragment");
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const Template = require("./Template");
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const { mergeRuntime } = require("./util/runtime");
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/** @typedef {import("webpack-sources").Source} Source */
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/** @typedef {import("./Generator").GenerateContext} GenerateContext */
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/** @typedef {import("./util/runtime").RuntimeSpec} RuntimeSpec */
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/**
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* @param {string} condition condition
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* @param {string | Source} source source
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* @returns {string | Source} wrapped source
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*/
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const wrapInCondition = (condition, source) => {
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if (typeof source === "string") {
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return Template.asString([
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`if (${condition}) {`,
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Template.indent(source),
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"}",
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""
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]);
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}
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return new ConcatSource(
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`if (${condition}) {\n`,
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new PrefixSource("\t", source),
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"}\n"
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);
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};
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/**
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* @extends {InitFragment<GenerateContext>}
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*/
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class ConditionalInitFragment extends InitFragment {
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/**
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* @param {string | Source | undefined} content the source code that will be included as initialization code
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* @param {number} stage category of initialization code (contribute to order)
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* @param {number} position position in the category (contribute to order)
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* @param {string | undefined} key unique key to avoid emitting the same initialization code twice
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* @param {RuntimeSpec | boolean} runtimeCondition in which runtime this fragment should be executed
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* @param {string | Source=} endContent the source code that will be included at the end of the module
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*/
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constructor(
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content,
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stage,
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position,
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key,
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runtimeCondition = true,
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endContent = undefined
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) {
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super(content, stage, position, key, endContent);
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this.runtimeCondition = runtimeCondition;
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}
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/**
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* @param {GenerateContext} context context
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* @returns {string | Source | undefined} the source code that will be included as initialization code
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*/
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getContent(context) {
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if (this.runtimeCondition === false || !this.content) return "";
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if (this.runtimeCondition === true) return this.content;
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const expr = context.runtimeTemplate.runtimeConditionExpression({
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chunkGraph: context.chunkGraph,
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runtimeRequirements: context.runtimeRequirements,
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runtime: context.runtime,
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runtimeCondition: this.runtimeCondition
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});
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if (expr === "true") return this.content;
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return wrapInCondition(expr, this.content);
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}
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/**
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* @param {GenerateContext} context context
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* @returns {string|Source=} the source code that will be included at the end of the module
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*/
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getEndContent(context) {
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if (this.runtimeCondition === false || !this.endContent) return "";
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if (this.runtimeCondition === true) return this.endContent;
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const expr = context.runtimeTemplate.runtimeConditionExpression({
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chunkGraph: context.chunkGraph,
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runtimeRequirements: context.runtimeRequirements,
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runtime: context.runtime,
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runtimeCondition: this.runtimeCondition
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});
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if (expr === "true") return this.endContent;
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return wrapInCondition(expr, this.endContent);
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}
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/**
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* @param {ConditionalInitFragment} other fragment to merge with
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* @returns {ConditionalInitFragment} merged fragment
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*/
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merge(other) {
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if (this.runtimeCondition === true) return this;
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if (other.runtimeCondition === true) return other;
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if (this.runtimeCondition === false) return other;
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if (other.runtimeCondition === false) return this;
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const runtimeCondition = mergeRuntime(
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this.runtimeCondition,
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other.runtimeCondition
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);
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return new ConditionalInitFragment(
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this.content,
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this.stage,
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this.position,
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this.key,
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runtimeCondition,
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this.endContent
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);
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}
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}
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module.exports = ConditionalInitFragment;
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