diff options
Diffstat (limited to 'node_modules/webpack/lib/json/JsonGenerator.js')
| -rw-r--r-- | node_modules/webpack/lib/json/JsonGenerator.js | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/node_modules/webpack/lib/json/JsonGenerator.js b/node_modules/webpack/lib/json/JsonGenerator.js new file mode 100644 index 00000000..d7074fc0 --- /dev/null +++ b/node_modules/webpack/lib/json/JsonGenerator.js @@ -0,0 +1,205 @@ +/* + MIT License http://www.opensource.org/licenses/mit-license.php + Author Tobias Koppers @sokra +*/ + +"use strict"; + +const { RawSource } = require("webpack-sources"); +const ConcatenationScope = require("../ConcatenationScope"); +const { UsageState } = require("../ExportsInfo"); +const Generator = require("../Generator"); +const RuntimeGlobals = require("../RuntimeGlobals"); + +/** @typedef {import("webpack-sources").Source} Source */ +/** @typedef {import("../ExportsInfo")} ExportsInfo */ +/** @typedef {import("../Generator").GenerateContext} GenerateContext */ +/** @typedef {import("../Module").ConcatenationBailoutReasonContext} ConcatenationBailoutReasonContext */ +/** @typedef {import("../NormalModule")} NormalModule */ +/** @typedef {import("../util/runtime").RuntimeSpec} RuntimeSpec */ +/** @typedef {import("./JsonData")} JsonData */ +/** @typedef {import("./JsonModulesPlugin").RawJsonData} RawJsonData */ + +/** + * @param {RawJsonData} data Raw JSON data + * @returns {undefined|string} stringified data + */ +const stringifySafe = data => { + const stringified = JSON.stringify(data); + if (!stringified) { + return undefined; // Invalid JSON + } + + return stringified.replace(/\u2028|\u2029/g, str => + str === "\u2029" ? "\\u2029" : "\\u2028" + ); // invalid in JavaScript but valid JSON +}; + +/** + * @param {RawJsonData} data Raw JSON data (always an object or array) + * @param {ExportsInfo} exportsInfo exports info + * @param {RuntimeSpec} runtime the runtime + * @returns {RawJsonData} reduced data + */ +const createObjectForExportsInfo = (data, exportsInfo, runtime) => { + if (exportsInfo.otherExportsInfo.getUsed(runtime) !== UsageState.Unused) + return data; + const isArray = Array.isArray(data); + /** @type {RawJsonData} */ + const reducedData = isArray ? [] : {}; + for (const key of Object.keys(data)) { + const exportInfo = exportsInfo.getReadOnlyExportInfo(key); + const used = exportInfo.getUsed(runtime); + if (used === UsageState.Unused) continue; + + /** @type {RawJsonData} */ + let value; + if (used === UsageState.OnlyPropertiesUsed && exportInfo.exportsInfo) { + value = createObjectForExportsInfo( + data[key], + exportInfo.exportsInfo, + runtime + ); + } else { + value = data[key]; + } + + const name = /** @type {string} */ (exportInfo.getUsedName(key, runtime)); + /** @type {Record<string, RawJsonData>} */ (reducedData)[name] = value; + } + if (isArray) { + let arrayLengthWhenUsed = + exportsInfo.getReadOnlyExportInfo("length").getUsed(runtime) !== + UsageState.Unused + ? data.length + : undefined; + + let sizeObjectMinusArray = 0; + for (let i = 0; i < reducedData.length; i++) { + if (reducedData[i] === undefined) { + sizeObjectMinusArray -= 2; + } else { + sizeObjectMinusArray += `${i}`.length + 3; + } + } + if (arrayLengthWhenUsed !== undefined) { + sizeObjectMinusArray += + `${arrayLengthWhenUsed}`.length + + 8 - + (arrayLengthWhenUsed - reducedData.length) * 2; + } + if (sizeObjectMinusArray < 0) + return Object.assign( + arrayLengthWhenUsed === undefined + ? {} + : { length: arrayLengthWhenUsed }, + reducedData + ); + /** @type {number} */ + const generatedLength = + arrayLengthWhenUsed !== undefined + ? Math.max(arrayLengthWhenUsed, reducedData.length) + : reducedData.length; + for (let i = 0; i < generatedLength; i++) { + if (reducedData[i] === undefined) { + reducedData[i] = 0; + } + } + } + return reducedData; +}; + +const TYPES = new Set(["javascript"]); + +class JsonGenerator extends Generator { + /** + * @param {NormalModule} module fresh module + * @returns {Set<string>} available types (do not mutate) + */ + getTypes(module) { + return TYPES; + } + + /** + * @param {NormalModule} module the module + * @param {string=} type source type + * @returns {number} estimate size of the module + */ + getSize(module, type) { + /** @type {RawJsonData | undefined} */ + const data = + module.buildInfo && + module.buildInfo.jsonData && + module.buildInfo.jsonData.get(); + if (!data) return 0; + return /** @type {string} */ (stringifySafe(data)).length + 10; + } + + /** + * @param {NormalModule} module module for which the bailout reason should be determined + * @param {ConcatenationBailoutReasonContext} context context + * @returns {string | undefined} reason why this module can't be concatenated, undefined when it can be concatenated + */ + getConcatenationBailoutReason(module, context) { + return undefined; + } + + /** + * @param {NormalModule} module module for which the code should be generated + * @param {GenerateContext} generateContext context for generate + * @returns {Source} generated code + */ + generate( + module, + { + moduleGraph, + runtimeTemplate, + runtimeRequirements, + runtime, + concatenationScope + } + ) { + /** @type {RawJsonData | undefined} */ + const data = + module.buildInfo && + module.buildInfo.jsonData && + module.buildInfo.jsonData.get(); + if (data === undefined) { + return new RawSource( + runtimeTemplate.missingModuleStatement({ + request: module.rawRequest + }) + ); + } + const exportsInfo = moduleGraph.getExportsInfo(module); + /** @type {RawJsonData} */ + let finalJson = + typeof data === "object" && + data && + exportsInfo.otherExportsInfo.getUsed(runtime) === UsageState.Unused + ? createObjectForExportsInfo(data, exportsInfo, runtime) + : data; + // Use JSON because JSON.parse() is much faster than JavaScript evaluation + const jsonStr = /** @type {string} */ (stringifySafe(finalJson)); + const jsonExpr = + jsonStr.length > 20 && typeof finalJson === "object" + ? `JSON.parse('${jsonStr.replace(/[\\']/g, "\\$&")}')` + : jsonStr; + /** @type {string} */ + let content; + if (concatenationScope) { + content = `${runtimeTemplate.supportsConst() ? "const" : "var"} ${ + ConcatenationScope.NAMESPACE_OBJECT_EXPORT + } = ${jsonExpr};`; + concatenationScope.registerNamespaceExport( + ConcatenationScope.NAMESPACE_OBJECT_EXPORT + ); + } else { + runtimeRequirements.add(RuntimeGlobals.module); + content = `${module.moduleArgument}.exports = ${jsonExpr};`; + } + return new RawSource(content); + } +} + +module.exports = JsonGenerator; |