refactor: custom json parse not needed
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376
src/parse.ts
376
src/parse.ts
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// @ts-nocheck
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import { objAsString } from "./objAsString.js";
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import { Err } from "./types.js";
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// json_parse extracted from the json-bigint npm library
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// regexpxs extracted from
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// (c) BSD-3-Clause
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// https://github.com/fastify/secure-json-parse/graphs/contributors and https://github.com/hapijs/bourne/graphs/contributors
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const suspectProtoRx =
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/(?:_|\\u005[Ff])(?:_|\\u005[Ff])(?:p|\\u0070)(?:r|\\u0072)(?:o|\\u006[Ff])(?:t|\\u0074)(?:o|\\u006[Ff])(?:_|\\u005[Ff])(?:_|\\u005[Ff])/;
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const suspectConstructorRx =
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/(?:c|\\u0063)(?:o|\\u006[Ff])(?:n|\\u006[Ee])(?:s|\\u0073)(?:t|\\u0074)(?:r|\\u0072)(?:u|\\u0075)(?:c|\\u0063)(?:t|\\u0074)(?:o|\\u006[Ff])(?:r|\\u0072)/;
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let json_parse = function (options) {
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"use strict";
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// This is a function that can parse a JSON text, producing a JavaScript
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// data structure. It is a simple, recursive descent parser. It does not use
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// eval or regular expressions, so it can be used as a model for implementing
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// a JSON parser in other languages.
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// We are defining the function inside of another function to avoid creating
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// global variables.
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// Default options one can override by passing options to the parse()
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let _options = {
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strict: false, // not being strict means do not generate syntax errors for "duplicate key"
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storeAsString: false, // toggles whether the values should be stored as BigNumber (default) or a string
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alwaysParseAsBig: false, // toggles whether all numbers should be Big
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protoAction: "error",
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constructorAction: "error",
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};
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// If there are options, then use them to override the default _options
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if (options !== undefined && options !== null) {
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if (options.strict === true) {
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_options.strict = true;
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}
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if (options.storeAsString === true) {
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_options.storeAsString = true;
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}
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_options.alwaysParseAsBig = options.alwaysParseAsBig === true ? options.alwaysParseAsBig : false;
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if (typeof options.constructorAction !== "undefined") {
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if (
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options.constructorAction === "error" ||
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options.constructorAction === "ignore" ||
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options.constructorAction === "preserve"
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) {
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_options.constructorAction = options.constructorAction;
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} else {
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throw new Error(
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`Incorrect value for constructorAction option, must be "error", "ignore" or undefined but passed ${options.constructorAction}`
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);
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}
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}
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if (typeof options.protoAction !== "undefined") {
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if (options.protoAction === "error" || options.protoAction === "ignore" || options.protoAction === "preserve") {
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_options.protoAction = options.protoAction;
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} else {
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throw new Error(
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`Incorrect value for protoAction option, must be "error", "ignore" or undefined but passed ${options.protoAction}`
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);
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}
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}
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}
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let at, // The index of the current character
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ch, // The current character
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escapee = {
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'"': '"',
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"\\": "\\",
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"/": "/",
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b: "\b",
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f: "\f",
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n: "\n",
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r: "\r",
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t: "\t",
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},
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text,
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error = function (m) {
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// Call error when something is wrong.
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throw {
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name: "SyntaxError",
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message: m,
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at: at,
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text: text,
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};
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},
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next = function (c) {
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// If a c parameter is provided, verify that it matches the current character.
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if (c && c !== ch) {
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error("Expected '" + c + "' instead of '" + ch + "'");
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}
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// Get the next character. When there are no more characters,
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// return the empty string.
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ch = text.charAt(at);
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at += 1;
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return ch;
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},
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number = function () {
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// Parse a number value.
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let number,
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string = "";
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if (ch === "-") {
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string = "-";
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next("-");
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}
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while (ch >= "0" && ch <= "9") {
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string += ch;
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next();
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}
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if (ch === ".") {
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string += ".";
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while (next() && ch >= "0" && ch <= "9") {
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string += ch;
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}
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}
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if (ch === "e" || ch === "E") {
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string += ch;
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next();
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if (ch === "-" || ch === "+") {
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string += ch;
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next();
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}
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while (ch >= "0" && ch <= "9") {
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string += ch;
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next();
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}
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}
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number = +string;
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if (!isFinite(number)) {
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error("Bad number");
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} else {
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if (Number.isSafeInteger(number)) return !_options.alwaysParseAsBig ? number : BigInt(number);
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// Number with fractional part should be treated as number(double) including big integers in scientific notation, i.e 1.79e+308
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else return _options.storeAsString ? string : /[.eE]/.test(string) ? number : BigInt(string);
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}
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},
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string = function () {
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// Parse a string value.
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let hex,
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i,
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string = "",
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uffff;
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// When parsing for string values, we must look for " and \ characters.
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if (ch === '"') {
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let startAt = at;
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while (next()) {
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if (ch === '"') {
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if (at - 1 > startAt) string += text.substring(startAt, at - 1);
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next();
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return string;
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}
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if (ch === "\\") {
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if (at - 1 > startAt) string += text.substring(startAt, at - 1);
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next();
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if (ch === "u") {
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uffff = 0;
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for (i = 0; i < 4; i += 1) {
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hex = parseInt(next(), 16);
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if (!isFinite(hex)) {
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break;
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}
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uffff = uffff * 16 + hex;
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}
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string += String.fromCharCode(uffff);
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} else if (typeof escapee[ch] === "string") {
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string += escapee[ch];
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} else {
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break;
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}
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startAt = at;
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}
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}
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}
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error("Bad string");
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},
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white = function () {
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// Skip whitespace.
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while (ch && ch <= " ") {
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next();
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}
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},
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word = function () {
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// true, false, or null.
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switch (ch) {
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case "t":
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next("t");
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next("r");
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next("u");
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next("e");
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return true;
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case "f":
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next("f");
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next("a");
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next("l");
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next("s");
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next("e");
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return false;
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case "n":
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next("n");
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next("u");
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next("l");
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next("l");
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return null;
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}
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error("Unexpected '" + ch + "'");
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},
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value, // Place holder for the value function.
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array = function () {
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// Parse an array value.
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let array = [];
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if (ch === "[") {
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next("[");
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white();
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if (ch === "]") {
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next("]");
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return array; // empty array
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}
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while (ch) {
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array.push(value());
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white();
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if (ch === "]") {
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next("]");
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return array;
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}
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next(",");
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white();
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}
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}
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error("Bad array");
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},
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object = function () {
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// Parse an object value.
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let key,
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object = Object.create(null);
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if (ch === "{") {
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next("{");
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white();
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if (ch === "}") {
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next("}");
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return object; // empty object
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}
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while (ch) {
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key = string();
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white();
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next(":");
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if (_options.strict === true && Object.hasOwnProperty.call(object, key)) {
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error('Duplicate key "' + key + '"');
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}
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if (suspectProtoRx.test(key) === true) {
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if (_options.protoAction === "error") {
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error("Object contains forbidden prototype property");
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} else if (_options.protoAction === "ignore") {
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value();
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} else {
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object[key] = value();
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}
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} else if (suspectConstructorRx.test(key) === true) {
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if (_options.constructorAction === "error") {
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error("Object contains forbidden constructor property");
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} else if (_options.constructorAction === "ignore") {
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value();
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} else {
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object[key] = value();
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}
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} else {
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object[key] = value();
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}
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white();
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if (ch === "}") {
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next("}");
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return object;
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}
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next(",");
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white();
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}
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}
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error("Bad object");
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};
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value = function () {
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// Parse a JSON value. It could be an object, an array, a string, a number,
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// or a word.
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white();
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switch (ch) {
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case "{":
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return object();
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case "[":
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return array();
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case '"':
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return string();
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case "-":
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return number();
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default:
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return ch >= "0" && ch <= "9" ? number() : word();
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}
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};
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// Return the json_parse function. It will have access to all of the above
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// functions and variables.
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return function (source, reviver) {
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let result;
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text = source + "";
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at = 0;
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ch = " ";
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result = value();
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white();
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if (ch) {
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error("Syntax error");
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}
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// If there is a reviver function, we recursively walk the new structure,
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// passing each name/value pair to the reviver function for possible
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// transformation, starting with a temporary root object that holds the result
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// in an empty key. If there is not a reviver function, we simply return the
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// result.
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return typeof reviver === "function"
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? (function walk(holder, key) {
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let v,
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value = holder[key];
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if (value && typeof value === "object") {
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Object.keys(value).forEach(function (k) {
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v = walk(value, k);
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if (v !== undefined) {
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value[k] = v;
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} else {
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delete value[k];
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}
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});
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}
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return reviver.call(holder, key, value);
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})({ "": result }, "")
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: result;
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};
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};
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// parseJSON is a wrapper for JSONbig.parse that returns an error rather than
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// throwing an error. JSONbig is an alternative to JSON.parse that decodes
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// every number as a bigint. This is required when working with the skyd API
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// because the skyd API uses 64 bit precision for all of its numbers, and
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// therefore cannot be parsed losslessly by javascript. The skyd API is
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// cryptographic, therefore full precision is required.
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function parseJSON(json: string): [any, Err] {
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try {
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let obj = json_parse({ alwaysParseAsBig: true })(json);
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return [obj, null];
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} catch (err: any) {
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return [{}, objAsString(err)];
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}
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}
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export { parseJSON };
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