webpack/lib/json/JsonParser.js

Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support loaders to preprocess files, i.e. json, jsx, es7, css, less, ... and your custom stuff.

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

"use strict";

const parseJson = require("json-parse-better-errors");
const Parser = require("../Parser");
const JsonExportsDependency = require("../dependencies/JsonExportsDependency");
const JsonData = require("./JsonData");

/** @typedef {import("../../declarations/plugins/JsonModulesPluginParser").JsonModulesPluginParserOptions} JsonModulesPluginParserOptions */
/** @typedef {import("../Parser").ParserState} ParserState */
/** @typedef {import("../Parser").PreparsedAst} PreparsedAst */

class JsonParser extends Parser {
	/**
	 * @param {JsonModulesPluginParserOptions} options parser options
	 */
	constructor(options) {
		super();
		this.options = options || {};
	}

	/**
	 * @param {string | Buffer | PreparsedAst} source the source to parse
	 * @param {ParserState} state the parser state
	 * @returns {ParserState} the parser state
	 */
	parse(source, state) {
		if (Buffer.isBuffer(source)) {
			source = source.toString("utf-8");
		}

		/** @type {JsonModulesPluginParserOptions["parse"]} */
		const parseFn =
			typeof this.options.parse === "function" ? this.options.parse : parseJson;

		const data =
			typeof source === "object"
				? source
				: parseFn(source[0] === "\ufeff" ? source.slice(1) : source);

		state.module.buildInfo.jsonData = new JsonData(data);
		state.module.buildInfo.strict = true;
		state.module.buildMeta.exportsType = "default";
		state.module.buildMeta.defaultObject =
			typeof data === "object" ? "redirect-warn" : false;
		state.module.addDependency(
			new JsonExportsDependency(JsonExportsDependency.getExportsFromData(data))
		);
		return state;
	}
}

module.exports = JsonParser;