feat: rewrite datatype to ts

4 files changed, 349 insertions, 0 deletions

diff --git a/src/datatype.ts b/src/datatype.ts
new file mode 100644
index 00000000..9aa2dea9
--- /dev/null
+++ b/src/datatype.ts
@@ -0,0 +1,253 @@
+import type { Faker } from '.';
+
+export class Datatype {
+  constructor(private readonly faker: Faker, seed?: any[] | any) {
+    // Use a user provided seed if it is an array or number
+    if (Array.isArray(seed) && seed.length) {
+      this.faker.mersenne.seed_array(seed);
+    } else if (!isNaN(seed)) {
+      this.faker.mersenne.seed(seed);
+    }
+  }
+
+  /**
+   * Returns a single random number based on a max number or range.
+   *
+   * @method faker.datatype.number
+   * @param options
+   */
+  number(
+    options?: number | { min?: number; max?: number; precision?: number }
+  ): number {
+    if (typeof options === 'number') {
+      options = { max: options };
+    }
+
+    options = options ?? {};
+
+    if (typeof options.min === 'undefined') {
+      options.min = 0;
+    }
+
+    if (typeof options.max === 'undefined') {
+      options.max = 99999;
+    }
+
+    if (typeof options.precision === 'undefined') {
+      options.precision = 1;
+    }
+
+    // Make the range inclusive of the max value
+    let max = options.max;
+    if (max >= 0) {
+      max += options.precision;
+    }
+
+    let randomNumber = Math.floor(
+      this.faker.mersenne.rand(
+        max / options.precision,
+        options.min / options.precision
+      )
+    );
+    // Workaround problem in Float point arithmetics for e.g. 6681493 / 0.01
+    randomNumber = randomNumber / (1 / options.precision);
+
+    return randomNumber;
+  }
+
+  /**
+   * Returns a single random floating-point number based on a max number or range.
+   *
+   * @method faker.datatype.float
+   * @param options
+   */
+  float(
+    options?: number | { min?: number; max?: number; precision?: number }
+  ): number {
+    if (typeof options === 'number') {
+      options = {
+        precision: options,
+      };
+    }
+    options = options || {};
+    const opts: { precision?: number } = {};
+    for (const p in options) {
+      opts[p] = options[p];
+    }
+    if (typeof opts.precision === 'undefined') {
+      opts.precision = 0.01;
+    }
+    return this.faker.datatype.number(opts);
+  }
+
+  /**
+   * Returns a Date object using a random number of milliseconds since 1. Jan 1970 UTC
+   * Caveat: seeding is not working
+   *
+   * @method faker.datatype.datetime
+   * @param options pass min OR max as number of milliseconds since 1. Jan 1970 UTC
+   */
+  datetime(options): Date {
+    if (typeof options === 'number') {
+      options = {
+        max: options,
+      };
+    }
+
+    const minMax = 8640000000000000;
+
+    options = options || {};
+
+    if (typeof options.min === 'undefined' || options.min < minMax * -1) {
+      options.min = new Date().setFullYear(1990, 1, 1);
+    }
+
+    if (typeof options.max === 'undefined' || options.max > minMax) {
+      options.max = new Date().setFullYear(2100, 1, 1);
+    }
+
+    const random = this.faker.datatype.number(options);
+    return new Date(random);
+  }
+
+  /**
+   * Returns a string, containing UTF-16 chars between 33 and 125 ('!' to '}')
+   *
+   *
+   * @method faker.datatype.string
+   * @param  length length of generated string, default = 10, max length = 2^20
+   */
+  string(length: number = 10): string {
+    const maxLength = Math.pow(2, 20);
+    if (length >= maxLength) {
+      length = maxLength;
+    }
+
+    const charCodeOption = {
+      min: 33,
+      max: 125,
+    };
+
+    let returnString = '';
+
+    for (var i = 0; i < length; i++) {
+      returnString += String.fromCharCode(
+        this.faker.datatype.number(charCodeOption)
+      );
+    }
+
+    return returnString;
+  }
+
+  /**
+   * uuid
+   *
+   * @method faker.datatype.uuid
+   */
+  uuid(): string {
+    const RFC4122_TEMPLATE = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx';
+    const replacePlaceholders = (placeholder) => {
+      const random = this.faker.datatype.number({ min: 0, max: 15 });
+      const value = placeholder == 'x' ? random : (random & 0x3) | 0x8;
+      return value.toString(16);
+    };
+    return RFC4122_TEMPLATE.replace(/[xy]/g, replacePlaceholders);
+  }
+
+  /**
+   * boolean
+   *
+   * @method faker.datatype.boolean
+   */
+  boolean(): boolean {
+    return !!this.faker.datatype.number(1);
+  }
+
+  /**
+   * hexaDecimal
+   *
+   * @method faker.datatype.hexaDecimal
+   * @param {number} count defaults to 1
+   */
+  hexaDecimal(count: number = 1): string {
+    let wholeString = '';
+    for (let i = 0; i < count; i++) {
+      wholeString += this.faker.random.arrayElement([
+        '0',
+        '1',
+        '2',
+        '3',
+        '4',
+        '5',
+        '6',
+        '7',
+        '8',
+        '9',
+        'a',
+        'b',
+        'c',
+        'd',
+        'e',
+        'f',
+        'A',
+        'B',
+        'C',
+        'D',
+        'E',
+        'F',
+      ]);
+    }
+
+    return '0x' + wholeString;
+  }
+
+  /**
+   * Returns json object with 7 pre-defined properties
+   *
+   * @method faker.datatype.json
+   */
+  json(): string {
+    const properties = ['foo', 'bar', 'bike', 'a', 'b', 'name', 'prop'];
+
+    const returnObject: Record<string, string | number> = {};
+    properties.forEach((prop) => {
+      returnObject[prop] = this.faker.datatype.boolean()
+        ? this.faker.datatype.string()
+        : this.faker.datatype.number();
+    });
+
+    return JSON.stringify(returnObject);
+  }
+
+  /**
+   * Returns an array with values generated by faker.datatype.number and faker.datatype.string
+   *
+   * @method faker.datatype.array
+   * @param  length length of the returned array
+   */
+
+  array(length: number = 10): Array<string | number> {
+    const returnArray = new Array(length);
+    for (var i = 0; i < length; i++) {
+      returnArray[i] = this.faker.datatype.boolean()
+        ? this.faker.datatype.string()
+        : this.faker.datatype.number();
+    }
+    return returnArray;
+  }
+
+  /**
+   * Returns a Big Integer with values generated by faker.datatype.bigInt
+   *
+   * @method faker.datatype.bigInt
+   * @param value
+   */
+  bigInt(value?: string | number | bigint | boolean): bigint {
+    if (value === undefined) {
+      value =
+        Math.floor(this.faker.datatype.number() * 99999999999) + 10000000000;
+    }
+
+    return BigInt(value);
+  }
+}
diff --git a/src/index.ts b/src/index.ts
new file mode 100644
index 00000000..ea724d04
--- /dev/null
+++ b/src/index.ts
@@ -0,0 +1,36 @@
+import { Datatype } from './datatype';
+import { Mersenne } from './mersenne';
+import { Random } from './random';
+
+export interface FakerOptions {
+  locales?: string[];
+  locale?: string;
+  localeFallback?: string;
+}
+
+export class Faker {
+  locales: string[] | {};
+  locale: string;
+  localeFallback: string;
+
+  seedValue?: any[] | any;
+
+  readonly mersenne: Mersenne = new Mersenne();
+  random = new Random(this);
+  datatype: Datatype = new Datatype(this);
+
+  constructor(opts: FakerOptions = {}) {
+    this.locales = this.locales || opts.locales || {};
+    this.locale = this.locale || opts.locale || 'en';
+    this.localeFallback = this.localeFallback || opts.localeFallback || 'en';
+  }
+
+  seed(value?: any[] | any) {
+    this.seedValue = value;
+    this.random = new Random(this, this.seedValue);
+    this.datatype = new Datatype(this, this.seedValue);
+  }
+}
+
+export default Faker;
+module.exports = Faker;
diff --git a/src/mersenne.ts b/src/mersenne.ts
new file mode 100644
index 00000000..e7ab78eb
--- /dev/null
+++ b/src/mersenne.ts
@@ -0,0 +1,36 @@
+const Gen = require('../vendor/mersenne').MersenneTwister19937;
+
+export class Mersenne {
+  private gen = new Gen();
+
+  constructor() {
+    this.gen.init_genrand(new Date().getTime() % 1000000000);
+  }
+
+  rand(max, min) {
+    if (max === undefined) {
+      min = 0;
+      max = 32768;
+    }
+
+    return Math.floor(this.gen.genrand_real2() * (max - min) + min);
+  }
+
+  seed(S) {
+    if (typeof S != 'number') {
+      throw new Error('seed(S) must take numeric argument; is ' + typeof S);
+    }
+
+    this.gen.init_genrand(S);
+  }
+
+  seed_array(A) {
+    if (typeof A != 'object') {
+      throw new Error(
+        'seed_array(A) must take array of numbers; is ' + typeof A
+      );
+    }
+
+    this.gen.init_by_array(A, A.length);
+  }
+}
diff --git a/src/random.ts b/src/random.ts
new file mode 100644
index 00000000..8b4feb29
--- /dev/null
+++ b/src/random.ts
@@ -0,0 +1,24 @@
+import type { Faker } from '.';
+
+export class Random {
+  constructor(private readonly faker: Faker, seed?: any[] | any) {
+    // Use a user provided seed if it is an array or number
+    if (Array.isArray(seed) && seed.length) {
+      this.faker.mersenne.seed_array(seed);
+    } else if (!isNaN(seed)) {
+      this.faker.mersenne.seed(seed);
+    }
+  }
+
+  /**
+   * Takes an array and returns a random element of the array.
+   *
+   * @method faker.random.arrayElement
+   * @param  array
+   */
+  arrayElement(array) {
+    array = array || ['a', 'b', 'c'];
+    var r = this.faker.datatype.number({ max: array.length - 1 });
+    return array[r];
+  }
+}