mirror of https://github.com/webpack/webpack.git
86 lines
2.8 KiB
JavaScript
86 lines
2.8 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 RawSource = require("webpack-sources").RawSource;
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const WebAssemblyImportDependency = require("../dependencies/WebAssemblyImportDependency");
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class WasmModuleTemplatePlugin {
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apply(moduleTemplate) {
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moduleTemplate.hooks.content.tap("WasmModuleTemplatePlugin", (moduleSource, module, {
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chunk
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}) => {
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if(module.type && module.type.startsWith("webassembly")) {
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if(chunk.isInitial())
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throw new Error("Sync WebAsssmbly compilation is not yet implemented");
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const generateExports = () => {
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if(Array.isArray(module.buildMeta.providedExports) && Array.isArray(module.usedExports)) {
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// generate mangled exports
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return module.buildMeta.providedExports.map(exp => {
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const usedName = module.isUsed(exp);
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if(usedName) {
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return `${module.exportsArgument}[${JSON.stringify(usedName)}] = instance.exports[${JSON.stringify(exp)}];`;
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} else {
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return `// unused ${JSON.stringify(exp)} export`;
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}
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}).join("\n");
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} else {
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// generate simple export
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return `${module.moduleArgument}.exports = instance.exports;`;
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}
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};
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const generateImports = () => {
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const depsByRequest = new Map();
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for(const dep of module.dependencies) {
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if(dep instanceof WebAssemblyImportDependency) {
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const request = dep.request;
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let array = depsByRequest.get(request);
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if(!array) {
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depsByRequest.set(request, array = []);
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}
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const exportName = dep.name;
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const usedName = dep.module && dep.module.isUsed(exportName);
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array.push({
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exportName,
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usedName,
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module: dep.module
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});
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}
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}
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const importsCode = [];
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for(const pair of depsByRequest) {
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const properties = [];
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for(const data of pair[1]) {
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properties.push(`\n\t\t${JSON.stringify(data.exportName)}: __webpack_require__(${JSON.stringify(data.module.id)})[${JSON.stringify(data.usedName)}]`);
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}
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importsCode.push(`\n\t${JSON.stringify(pair[0])}: {${properties.join(",")}\n\t}`);
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}
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return importsCode.join(",");
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};
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const source = new RawSource([
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"\"use strict\";",
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"",
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"// Instanciate WebAssembly module",
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"var instance = new WebAssembly.Instance(__webpack_require__.w[module.i], {" + generateImports(),
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"});",
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"",
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"// export exports from WebAssmbly module",
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// TODO rewrite this to getters depending on exports to support circular dependencies
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generateExports()
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].join("\n"));
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return source;
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} else {
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return moduleSource;
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}
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});
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moduleTemplate.hooks.hash.tap("WasmModuleTemplatePlugin", hash => {
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hash.update("WasmModuleTemplatePlugin");
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hash.update("1");
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});
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}
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}
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module.exports = WasmModuleTemplatePlugin;
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