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Validation, isSimpleType, isArray, isEnum,
isObj, isMap, isNumber, isMeta, isAnd,
isString, SimpleTypes, isTypeDefValidation, ValueTypes
} from './validationTypes.js'
import { combineValidationObjects } from './validate.js'
import randexp from 'randexp'
type Options = {
arrayMin: number
arrayMax: number
mapMin: number
mapMax: number
minNumber: number
maxNumber: number
minStringLength: number
maxStringLength: number
maxDepthSoft: number
maxDepthHard: number
prefer: 'defined' | 'undefined' | 'none'
}
export const randomNumber = (isInteger:boolean, min: number, max: number): number => {
const num = Math.random() * (max - min) + min
if (isInteger) return Math.round(num)
return num
}
const simpleTypes: SimpleTypes[] = ['number', 'integer', '?', 'string', 'boolean']
const randomString = (length: number) => {
let result = ''
const characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'
const charactersLength = characters.length
for (let i = 0; i < length; i += 1) { result += characters.charAt(Math.floor(Math.random() * charactersLength)) }
return result
}
const simpleGeneration = (type: SimpleTypes, options:Options): any => {
switch (type) {
case 'any': return simpleGeneration(simpleTypes[randomNumber(true, 0, simpleTypes.length - 1)], options)
case '?': return undefined
case 'null': return null
case 'number': return randomNumber(false, options.minNumber, options.maxNumber)
case 'integer': return randomNumber(true, options.minNumber, options.maxNumber)
case 'string': return randomString(
randomNumber(true, options.minStringLength, options.maxStringLength))
case 'boolean': return Math.random() > 0.5
default: throw new Error(`Unknown validator:${JSON.stringify(type)}`)
}
}
const applyPreference = (input: Validation[], options:Options) => {
if (options.prefer === 'defined') {
return input.length > 1 ? input.filter(x => x !== '?') : input
}
if (options.prefer === 'undefined') {
return input.find(x => x === '?') ? ['?'] : input
}
return input
}
export const generate = (type: Validation, options: Partial<Options> = {}) :any => {
const defaultOptions : Options = {
arrayMin: 1,
arrayMax: 90,
mapMin: 1,
mapMax: 33,
minNumber: -Number.MAX_SAFE_INTEGER,
maxNumber: Number.MAX_SAFE_INTEGER,
minStringLength: 3,
maxStringLength: 16,
maxDepthSoft: 4,
maxDepthHard: 32,
prefer: 'none'
}
return generateInternal(type, { ...defaultOptions, ...options }, {}, 0)
}
const generateInternal = (
typeIn: Validation,
options: Options,
typesIn: {[key:string] : Validation },
depth :number
): any => {
if (depth >= options.maxDepthHard) {
throw new Error(`Maximum depth reached: ${depth} --
Most likely a circular type with no possible way to terminate.
Consider making the recursion optional.`)
}
let customTypes = typesIn
let type:ValueTypes = typeIn
if (isTypeDefValidation(typeIn)) {
customTypes = typeIn.$types
type = { ...typeIn }
delete type.$types
}
const gen = (type:Validation, increaseDepth:boolean = false) =>
generateInternal(type, options, customTypes, increaseDepth ? depth + 1 : depth)
if (isSimpleType(type)) {
if (customTypes[type]) {
return gen(customTypes[type])
}
return simpleGeneration(type, options)
}
if (Array.isArray(type)) {
if (depth > options.maxDepthSoft && type.find(x => x === '?')) {
return simpleGeneration('?', options)
} else {
const typeArray = applyPreference(type, options)
const randomIndex = randomNumber(true, 0, typeArray.length - 1)
return gen(typeArray[randomIndex])
}
}
if (isArray(type)) {
const arrayType = type
if (depth > options.maxDepthSoft) return []
const min = typeof arrayType.minLength === 'number' ? arrayType.minLength : options.arrayMin
const max = typeof arrayType.maxLength === 'number' ? arrayType.maxLength : options.arrayMax
return Array.from(Array(randomNumber(true, min, max)))
.map(() => gen(arrayType.$array, true)).filter(x => typeof x !== 'undefined')
}
if (isEnum(type)) { return type.$enum[randomNumber(true, 0, type.$enum.length - 1)] }
if (isObj(type)) {
return Object.entries(type).reduce((prev: any, [key, value]) => {
const generated = gen(value, true)
const keyC = key.startsWith('\\$') ? key.slice(1) : key
if (typeof generated !== 'undefined') prev[keyC] = generated
return prev
}, {})
}
if (isMap(type)) {
const mapType = type
const min = typeof mapType.minLength === 'number' ? mapType.minLength : options.mapMin
const max = typeof mapType.maxLength === 'number' ? mapType.maxLength : options.mapMax
if (depth >= options.maxDepthSoft && (mapType.minLength || 0) <= 0) return {}
const count = randomNumber(true, min, max)
return Array.from(Array(count))
.reduce((prev: any) => {
const str = mapType.regex ? randexp.randexp(mapType.regex) : simpleGeneration('string', options)
prev[str] = gen(mapType.$map, true)
return prev
}, {})
}
if (isNumber(type)) {
return randomNumber(
false,
type.$number.min == null ? options.minNumber : type.$number.min,
type.$number.max == null ? options.maxNumber : type.$number.max)
}
if (isMeta(type)) { return gen(type.$type) }
if (isString(type)) {
if (type.$string.regex) { return randexp.randexp(type.$string.regex) }
return randomString(type.$string.minLength || type.$string.maxLength || 6)
}
if (isAnd(type)) {
const combined = combineValidationObjects(type, customTypes, (x) => x)
if (combined.result === 'error') {
throw new Error('Schema error, $and types must be objects: ' + JSON.stringify(combined.error, null, 2))
}
return gen(combined.pass)
}
throw new Error('Unknown type')
}
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