refactor: custom json parse not needed

2023-09-07 19:30:34 -04:00 · 2023-09-07 19:30:34 -04:00 · 885aaadd4f
parent a8f2eb666b
commit 885aaadd4f
1 changed files with 0 additions and 376 deletions
--- a/src/parse.ts
+++ b/src/parse.ts
@ -1,376 +0,0 @@
 // @ts-nocheck
 import { objAsString } from "./objAsString.js";
 import { Err } from "./types.js";
 // json_parse extracted from the json-bigint npm library
 // regexpxs extracted from
 // (c) BSD-3-Clause
 // https://github.com/fastify/secure-json-parse/graphs/contributors and https://github.com/hapijs/bourne/graphs/contributors
 const suspectProtoRx =
  /(?:_|\\u005[Ff])(?:_|\\u005[Ff])(?:p|\\u0070)(?:r|\\u0072)(?:o|\\u006[Ff])(?:t|\\u0074)(?:o|\\u006[Ff])(?:_|\\u005[Ff])(?:_|\\u005[Ff])/;
 const suspectConstructorRx =
  /(?: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)/;
 let json_parse = function (options) {
  "use strict";
  // This is a function that can parse a JSON text, producing a JavaScript
  // data structure. It is a simple, recursive descent parser. It does not use
  // eval or regular expressions, so it can be used as a model for implementing
  // a JSON parser in other languages.
  // We are defining the function inside of another function to avoid creating
  // global variables.
  // Default options one can override by passing options to the parse()
  let _options = {
    strict: false, // not being strict means do not generate syntax errors for "duplicate key"
    storeAsString: false, // toggles whether the values should be stored as BigNumber (default) or a string
    alwaysParseAsBig: false, // toggles whether all numbers should be Big
    protoAction: "error",
    constructorAction: "error",
  };
  // If there are options, then use them to override the default _options
  if (options !== undefined && options !== null) {
    if (options.strict === true) {
      _options.strict = true;
    }
    if (options.storeAsString === true) {
      _options.storeAsString = true;
    }
    _options.alwaysParseAsBig = options.alwaysParseAsBig === true ? options.alwaysParseAsBig : false;
    if (typeof options.constructorAction !== "undefined") {
      if (
        options.constructorAction === "error" ||
        options.constructorAction === "ignore" ||
        options.constructorAction === "preserve"
      ) {
        _options.constructorAction = options.constructorAction;
      } else {
        throw new Error(
          `Incorrect value for constructorAction option, must be "error", "ignore" or undefined but passed ${options.constructorAction}`
        );
      }
    }
    if (typeof options.protoAction !== "undefined") {
      if (options.protoAction === "error" || options.protoAction === "ignore" || options.protoAction === "preserve") {
        _options.protoAction = options.protoAction;
      } else {
        throw new Error(
          `Incorrect value for protoAction option, must be "error", "ignore" or undefined but passed ${options.protoAction}`
        );
      }
    }
  }
  let at, // The index of the current character
    ch, // The current character
    escapee = {
      '"': '"',
      "\\": "\\",
      "/": "/",
      b: "\b",
      f: "\f",
      n: "\n",
      r: "\r",
      t: "\t",
    },
    text,
    error = function (m) {
      // Call error when something is wrong.
      throw {
        name: "SyntaxError",
        message: m,
        at: at,
        text: text,
      };
    },
    next = function (c) {
      // If a c parameter is provided, verify that it matches the current character.
      if (c && c !== ch) {
        error("Expected '" + c + "' instead of '" + ch + "'");
      }
      // Get the next character. When there are no more characters,
      // return the empty string.
      ch = text.charAt(at);
      at += 1;
      return ch;
    },
    number = function () {
      // Parse a number value.
      let number,
        string = "";
      if (ch === "-") {
        string = "-";
        next("-");
      }
      while (ch >= "0" && ch <= "9") {
        string += ch;
        next();
      }
      if (ch === ".") {
        string += ".";
        while (next() && ch >= "0" && ch <= "9") {
          string += ch;
        }
      }
      if (ch === "e" || ch === "E") {
        string += ch;
        next();
        if (ch === "-" || ch === "+") {
          string += ch;
          next();
        }
        while (ch >= "0" && ch <= "9") {
          string += ch;
          next();
        }
      }
      number = +string;
      if (!isFinite(number)) {
        error("Bad number");
      } else {
        if (Number.isSafeInteger(number)) return !_options.alwaysParseAsBig ? number : BigInt(number);
        // Number with fractional part should be treated as number(double) including big integers in scientific notation, i.e 1.79e+308
        else return _options.storeAsString ? string : /[.eE]/.test(string) ? number : BigInt(string);
      }
    },
    string = function () {
      // Parse a string value.
      let hex,
        i,
        string = "",
        uffff;
      // When parsing for string values, we must look for " and \ characters.
      if (ch === '"') {
        let startAt = at;
        while (next()) {
          if (ch === '"') {
            if (at - 1 > startAt) string += text.substring(startAt, at - 1);
            next();
            return string;
          }
          if (ch === "\\") {
            if (at - 1 > startAt) string += text.substring(startAt, at - 1);
            next();
            if (ch === "u") {
              uffff = 0;
              for (i = 0; i < 4; i += 1) {
                hex = parseInt(next(), 16);
                if (!isFinite(hex)) {
                  break;
                }
                uffff = uffff * 16 + hex;
              }
              string += String.fromCharCode(uffff);
            } else if (typeof escapee[ch] === "string") {
              string += escapee[ch];
            } else {
              break;
            }
            startAt = at;
          }
        }
      }
      error("Bad string");
    },
    white = function () {
      // Skip whitespace.
      while (ch && ch <= " ") {
        next();
      }
    },
    word = function () {
      // true, false, or null.
      switch (ch) {
        case "t":
          next("t");
          next("r");
          next("u");
          next("e");
          return true;
        case "f":
          next("f");
          next("a");
          next("l");
          next("s");
          next("e");
          return false;
        case "n":
          next("n");
          next("u");
          next("l");
          next("l");
          return null;
      }
      error("Unexpected '" + ch + "'");
    },
    value, // Place holder for the value function.
    array = function () {
      // Parse an array value.
      let array = [];
      if (ch === "[") {
        next("[");
        white();
        if (ch === "]") {
          next("]");
          return array; // empty array
        }
        while (ch) {
          array.push(value());
          white();
          if (ch === "]") {
            next("]");
            return array;
          }
          next(",");
          white();
        }
      }
      error("Bad array");
    },
    object = function () {
      // Parse an object value.
      let key,
        object = Object.create(null);
      if (ch === "{") {
        next("{");
        white();
        if (ch === "}") {
          next("}");
          return object; // empty object
        }
        while (ch) {
          key = string();
          white();
          next(":");
          if (_options.strict === true && Object.hasOwnProperty.call(object, key)) {
            error('Duplicate key "' + key + '"');
          }
          if (suspectProtoRx.test(key) === true) {
            if (_options.protoAction === "error") {
              error("Object contains forbidden prototype property");
            } else if (_options.protoAction === "ignore") {
              value();
            } else {
              object[key] = value();
            }
          } else if (suspectConstructorRx.test(key) === true) {
            if (_options.constructorAction === "error") {
              error("Object contains forbidden constructor property");
            } else if (_options.constructorAction === "ignore") {
              value();
            } else {
              object[key] = value();
            }
          } else {
            object[key] = value();
          }
          white();
          if (ch === "}") {
            next("}");
            return object;
          }
          next(",");
          white();
        }
      }
      error("Bad object");
    };
  value = function () {
    // Parse a JSON value. It could be an object, an array, a string, a number,
    // or a word.
    white();
    switch (ch) {
      case "{":
        return object();
      case "[":
        return array();
      case '"':
        return string();
      case "-":
        return number();
      default:
        return ch >= "0" && ch <= "9" ? number() : word();
    }
  };
  // Return the json_parse function. It will have access to all of the above
  // functions and variables.
  return function (source, reviver) {
    let result;
    text = source + "";
    at = 0;
    ch = " ";
    result = value();
    white();
    if (ch) {
      error("Syntax error");
    }
    // If there is a reviver function, we recursively walk the new structure,
    // passing each name/value pair to the reviver function for possible
    // transformation, starting with a temporary root object that holds the result
    // in an empty key. If there is not a reviver function, we simply return the
    // result.
    return typeof reviver === "function"
      ? (function walk(holder, key) {
          let v,
            value = holder[key];
          if (value && typeof value === "object") {
            Object.keys(value).forEach(function (k) {
              v = walk(value, k);
              if (v !== undefined) {
                value[k] = v;
              } else {
                delete value[k];
              }
            });
          }
          return reviver.call(holder, key, value);
        })({ "": result }, "")
      : result;
  };
 };
 // parseJSON is a wrapper for JSONbig.parse that returns an error rather than
 // throwing an error. JSONbig is an alternative to JSON.parse that decodes
 // every number as a bigint. This is required when working with the skyd API
 // because the skyd API uses 64 bit precision for all of its numbers, and
 // therefore cannot be parsed losslessly by javascript. The skyd API is
 // cryptographic, therefore full precision is required.
 function parseJSON(json: string): [any, Err] {
  try {
    let obj = json_parse({ alwaysParseAsBig: true })(json);
    return [obj, null];
  } catch (err: any) {
    return [{}, objAsString(err)];
  }
 }
 export { parseJSON };