[6a3a178] | 1 | /*
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| 2 | MIT License http://www.opensource.org/licenses/mit-license.php
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| 3 | Author Tobias Koppers @sokra
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| 4 | */
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| 5 |
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| 6 | "use strict";
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| 7 |
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| 8 | const { RawSource } = require("webpack-sources");
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| 9 | const ConcatenationScope = require("../ConcatenationScope");
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| 10 | const { UsageState } = require("../ExportsInfo");
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| 11 | const Generator = require("../Generator");
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| 12 | const RuntimeGlobals = require("../RuntimeGlobals");
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| 13 |
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| 14 | /** @typedef {import("webpack-sources").Source} Source */
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| 15 | /** @typedef {import("../ExportsInfo")} ExportsInfo */
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| 16 | /** @typedef {import("../Generator").GenerateContext} GenerateContext */
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| 17 | /** @typedef {import("../Module").ConcatenationBailoutReasonContext} ConcatenationBailoutReasonContext */
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| 18 | /** @typedef {import("../NormalModule")} NormalModule */
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| 19 | /** @typedef {import("../util/runtime").RuntimeSpec} RuntimeSpec */
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| 20 |
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| 21 | const stringifySafe = data => {
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| 22 | const stringified = JSON.stringify(data);
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| 23 | if (!stringified) {
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| 24 | return undefined; // Invalid JSON
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| 25 | }
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| 26 |
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| 27 | return stringified.replace(/\u2028|\u2029/g, str =>
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| 28 | str === "\u2029" ? "\\u2029" : "\\u2028"
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| 29 | ); // invalid in JavaScript but valid JSON
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| 30 | };
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| 31 |
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| 32 | /**
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| 33 | * @param {Object} data data (always an object or array)
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| 34 | * @param {ExportsInfo} exportsInfo exports info
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| 35 | * @param {RuntimeSpec} runtime the runtime
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| 36 | * @returns {Object} reduced data
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| 37 | */
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| 38 | const createObjectForExportsInfo = (data, exportsInfo, runtime) => {
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| 39 | if (exportsInfo.otherExportsInfo.getUsed(runtime) !== UsageState.Unused)
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| 40 | return data;
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| 41 | const isArray = Array.isArray(data);
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| 42 | const reducedData = isArray ? [] : {};
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| 43 | for (const key of Object.keys(data)) {
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| 44 | const exportInfo = exportsInfo.getReadOnlyExportInfo(key);
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| 45 | const used = exportInfo.getUsed(runtime);
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| 46 | if (used === UsageState.Unused) continue;
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| 47 |
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| 48 | let value;
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| 49 | if (used === UsageState.OnlyPropertiesUsed && exportInfo.exportsInfo) {
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| 50 | value = createObjectForExportsInfo(
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| 51 | data[key],
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| 52 | exportInfo.exportsInfo,
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| 53 | runtime
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| 54 | );
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| 55 | } else {
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| 56 | value = data[key];
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| 57 | }
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| 58 | const name = exportInfo.getUsedName(key, runtime);
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| 59 | reducedData[name] = value;
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| 60 | }
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| 61 | if (isArray) {
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| 62 | let arrayLengthWhenUsed =
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| 63 | exportsInfo.getReadOnlyExportInfo("length").getUsed(runtime) !==
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| 64 | UsageState.Unused
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| 65 | ? data.length
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| 66 | : undefined;
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| 67 |
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| 68 | let sizeObjectMinusArray = 0;
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| 69 | for (let i = 0; i < reducedData.length; i++) {
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| 70 | if (reducedData[i] === undefined) {
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| 71 | sizeObjectMinusArray -= 2;
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| 72 | } else {
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| 73 | sizeObjectMinusArray += `${i}`.length + 3;
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| 74 | }
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| 75 | }
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| 76 | if (arrayLengthWhenUsed !== undefined) {
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| 77 | sizeObjectMinusArray +=
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| 78 | `${arrayLengthWhenUsed}`.length +
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| 79 | 8 -
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| 80 | (arrayLengthWhenUsed - reducedData.length) * 2;
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| 81 | }
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| 82 | if (sizeObjectMinusArray < 0)
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| 83 | return Object.assign(
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| 84 | arrayLengthWhenUsed === undefined
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| 85 | ? {}
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| 86 | : { length: arrayLengthWhenUsed },
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| 87 | reducedData
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| 88 | );
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| 89 | const generatedLength =
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| 90 | arrayLengthWhenUsed !== undefined
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| 91 | ? Math.max(arrayLengthWhenUsed, reducedData.length)
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| 92 | : reducedData.length;
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| 93 | for (let i = 0; i < generatedLength; i++) {
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| 94 | if (reducedData[i] === undefined) {
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| 95 | reducedData[i] = 0;
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| 96 | }
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| 97 | }
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| 98 | }
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| 99 | return reducedData;
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| 100 | };
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| 101 |
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| 102 | const TYPES = new Set(["javascript"]);
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| 103 |
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| 104 | class JsonGenerator extends Generator {
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| 105 | /**
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| 106 | * @param {NormalModule} module fresh module
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| 107 | * @returns {Set<string>} available types (do not mutate)
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| 108 | */
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| 109 | getTypes(module) {
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| 110 | return TYPES;
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| 111 | }
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| 112 |
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| 113 | /**
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| 114 | * @param {NormalModule} module the module
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| 115 | * @param {string=} type source type
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| 116 | * @returns {number} estimate size of the module
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| 117 | */
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| 118 | getSize(module, type) {
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| 119 | let data =
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| 120 | module.buildInfo &&
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| 121 | module.buildInfo.jsonData &&
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| 122 | module.buildInfo.jsonData.get();
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| 123 | if (!data) return 0;
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| 124 | return stringifySafe(data).length + 10;
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| 125 | }
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| 126 |
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| 127 | /**
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| 128 | * @param {NormalModule} module module for which the bailout reason should be determined
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| 129 | * @param {ConcatenationBailoutReasonContext} context context
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| 130 | * @returns {string | undefined} reason why this module can't be concatenated, undefined when it can be concatenated
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| 131 | */
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| 132 | getConcatenationBailoutReason(module, context) {
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| 133 | return undefined;
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| 134 | }
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| 135 |
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| 136 | /**
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| 137 | * @param {NormalModule} module module for which the code should be generated
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| 138 | * @param {GenerateContext} generateContext context for generate
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| 139 | * @returns {Source} generated code
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| 140 | */
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| 141 | generate(
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| 142 | module,
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| 143 | {
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| 144 | moduleGraph,
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| 145 | runtimeTemplate,
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| 146 | runtimeRequirements,
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| 147 | runtime,
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| 148 | concatenationScope
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| 149 | }
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| 150 | ) {
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| 151 | const data =
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| 152 | module.buildInfo &&
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| 153 | module.buildInfo.jsonData &&
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| 154 | module.buildInfo.jsonData.get();
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| 155 | if (data === undefined) {
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| 156 | return new RawSource(
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| 157 | runtimeTemplate.missingModuleStatement({
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| 158 | request: module.rawRequest
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| 159 | })
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| 160 | );
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| 161 | }
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| 162 | const exportsInfo = moduleGraph.getExportsInfo(module);
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| 163 | let finalJson =
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| 164 | typeof data === "object" &&
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| 165 | data &&
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| 166 | exportsInfo.otherExportsInfo.getUsed(runtime) === UsageState.Unused
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| 167 | ? createObjectForExportsInfo(data, exportsInfo, runtime)
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| 168 | : data;
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| 169 | // Use JSON because JSON.parse() is much faster than JavaScript evaluation
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| 170 | const jsonStr = stringifySafe(finalJson);
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| 171 | const jsonExpr =
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| 172 | jsonStr.length > 20 && typeof finalJson === "object"
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| 173 | ? `JSON.parse('${jsonStr.replace(/[\\']/g, "\\$&")}')`
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| 174 | : jsonStr;
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| 175 | let content;
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| 176 | if (concatenationScope) {
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| 177 | content = `${runtimeTemplate.supportsConst() ? "const" : "var"} ${
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| 178 | ConcatenationScope.NAMESPACE_OBJECT_EXPORT
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| 179 | } = ${jsonExpr};`;
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| 180 | concatenationScope.registerNamespaceExport(
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| 181 | ConcatenationScope.NAMESPACE_OBJECT_EXPORT
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| 182 | );
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| 183 | } else {
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| 184 | runtimeRequirements.add(RuntimeGlobals.module);
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| 185 | content = `${module.moduleArgument}.exports = ${jsonExpr};`;
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| 186 | }
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| 187 | return new RawSource(content);
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| 188 | }
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| 189 | }
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| 190 |
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| 191 | module.exports = JsonGenerator;
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