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Suma

Suma helps with single value validations, checks and parsing.

Extensible, test covered and errors code only!

For validation Suma does not validate schema or objects, just single values. For schema validation take a look at herbjs/gotu.

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``javascript
$ npm install @herbsjs/suma
`

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`javascript
const { validate } = require('@herbsjs/suma')

const value = null
const validations = { presence: true }
const result = validate(value, validations)
/* {
value: null,
errors: [{ cantBeEmpty: true }]
} */
`

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#### Presence

presence (boolean) - Validates that the specified value is not empty.

`javascript
const value = ''
const validations = { presence: true }
const result = validate(value, validations)
/* {
value: '',
errors: [{ cantBeEmpty: true }]
} */
`

#### Allow Null

allowNull (boolean) - Validates that the specified value is not null or undefined.

`javascript
const value = null
const validations = { allowNull: false }
const result = validate(value, validations)
/* {
value: null,
errors: [{ cantBeNull: true }]
} */
`

#### Presence vs allowNull

| | presence: true | allowNull: false |
| --------- | -------------- | ---------------- |
| 'Text' | Valid | Valid |
| 123 | Valid | Valid |
| 0 | Valid | Valid |
| ' ' | | Valid |
| '' | | Valid |
| [] | | Valid |
| {} | | Valid |
| null | | |
| undefined | | |

#### Contains

contains - The contains validator is useful for validating allowance or restriction in certain values.
It checks that the given value exists in the target given by the allowed or notAllowed option.

You can specify the validator as a list, string or as an object (in which case the keys of the object are used).

allowed option examples:

`javascript

const value = 'xlarge'
const validations = { contains: { allowed: ["small", "medium", "large"] } }
const result = validate(value, validations)
/* {
value: 'xlarge',
errors: [{ notContains: ["small", "medium", "large"] }]
} */

const value = 'hello'
const validations = { contains: { allowed: "lorem ipsum dolor" } }
const result = validate(value, validations)
/* {
value: 'hello',
errors: [{ notContains: "lorem ipsum dolor" }]
} */


const attr = 'price'
const validations = { contains: { allowed: {type:"Fiat", model:"500", color:"white"} } }
const result = validate(attr, validations)
/* {
value: 'price',
errors: [{ notContains: {type:"Fiat", model:"500", color:"white"} }]
} */

`

notAllowed option examples:

`javascript

const value = 'small'
const validations = { contains: { notAllowed: ["small", "medium", "large"] } }
const result = validate(value, validations)
/* {
value: 'small',
errors: [{ contains: ["small", "medium", "large"] }]
} */


const value = 'hello'
const validations = { contains: { notAllowed: "hello world" } }
const result = validate(value, validations)
/* {
value: 'hello',
errors: [{ contains: "hello world" }]
} */


const attr = 'type'
const validations = { contains: { notAllowed: {type:"Fiat", model:"500", color:"white"} } }
const result = validate(attr, validations)
/* {
value: 'type',
errors: [{ contains: {type:"Fiat", model:"500", color:"white"} }]
} */

`

using both options examples:

`javascript

const value = 'regular'
const validations = { contains: { notAllowed: ["xlarge", "xxlarge", "tiny"], allowed: ["small", "medium", "large"] } }
const result = validate(value, validations)
/* {
value: 'regular',
errors: [{ notContains: ["small", "medium", "large"] }]
} */

const value = 'xlarge'
const validations = { contains: { notAllowed: ["xlarge", "xxlarge", "tiny"], allowed: ["small", "medium", "large"] } }
const result = validate(value, validations)
/* {
value: 'xlarge',
errors: [
{ notContains: ["small", "medium", "large"] },
{ contains: ["xlarge", "xxlarge", "tiny"] }
]
} */


`

#### Length

Validates the length of the value.

It is possible to specify length constraints in different ways:

minimum (number) - The value cannot have less than the specified length

maximum (number) - The value cannot have more than the specified length

is (number) - The value length must be equal to the given length

`javascript
const value = 'john'
const validations = { length: { minimum: 5, maximum: 3, is: 1 } }
const result = validate(value, validations)
/* {
value: 'john',
errors: [
{ isTooShort: 5 },
{ isTooLong: 3 },
{ wrongLength: 1 }
]
} */
`

#### Numericality

Validates constraints to acceptable numeric values.

It must be a valid Number JS object. Use { type: Number } to validate if the value is a valid JS Number object.

equalTo (number) - Specifies the value must be equal to the supplied value.

greaterThan (number) - Specifies the value must be greater than the supplied value.

greaterThanOrEqualTo (number) - Specifies the value must be greater than or equal to the supplied value.

lessThan (number) - Specifies the value must be less than the supplied value.

lessThanOrEqualTo (number) - Specifies the value must be less than or equal to the supplied value.

onlyInteger (boolean) - To specify that only integral numbers are allowed.

`javascript
const value = 123.4
const validations = {
numericality: {
equalTo: 123,
greaterThan: 200,
greaterThanOrEqualTo: 123,
lessThan: 0,
lessThanOrEqualTo: 123,
onlyInteger: true
}
}
const result = validate(value, validations)
/* {
value: 123.4,
errors: [
{ notEqualTo: 123 },
{ notGreaterThan: 200 },
{ notLessThan: 0 },
{ notLessThanOrEqualTo: 123 },
{ notAnInteger: true }
]
} */
`

#### Datetime

Validates constraints to acceptable date and time values.

It must be a valid Date time JS object. Use { type: Date } to validate if the value is a valid JS Date object.

before (date) - A date must be before this value to be valid

after (date) - A date must be after this value to be valid

isAt (date) - A date must be equal to value to be valid

`javascript
const value = new Date('2001-01-02')
const validations = {
datetime : {
before: new Date('2001-01-01'),
after: new Date('2001-01-03'),
isAt: new Date('2001-02-02')
}
}
const result = validate(value, validations)
/* {
value: '2001-01-02T00:00:00.000Z',
errors: [
{ tooLate: '2001-01-01T00:00:00.000Z' },
{ tooEarly: '2001-01-03T00:00:00.000Z') },
{ notAt: '2001-02-02T00:00:00.000Z') }
]
} */
`

#### E-mail

The email validator attempts to make sure the input is a valid email.
Validating emails is tricky business due to the complex rules of email address formatting.

For example john.doe@gmail is a perfectly valid email but it's most likely just the case that John has forgotten to write .com at the end.

`javascript
const value = 'just\"not\"right@example.com'
const validations = { email: true }
const result = validate(value, validations)
/* {
value: 'just\"not\"right@example.com'
errors: [{ invalidEmail: true }]
} */
`

#### Format

format (regex) -The format validator will validate a value against a regular expression of your chosing.

`javascript

const pattern = /^[0-9]{8}$/ // or you can use new RegExp('^[0-9]{8}$')
const value = '05547-022'
const validations = { format: pattern }
const result = validate(value, validations)
/* {
value: '05547-022',
errors: [{ invalidFormat: true }]
} */


`

#### Type

Type validator ensures a value is of the correct JavaScript type or a custom type.

type - A valid native JavaScript type, a custom type or a array with type

Native JavaScript types:

Number - double-precision 64-bit binary format IEEE 754 value

String - a UTF‐16 character sequence

Boolean - true or false

Date - represents a single moment in time in a platform-independent format.

Object - the Object class represents one of JavaScript's data types.

Array - the Array class is a object that is used in the construction of arrays.

`javascript
const value = '2001'
const validations = { type: Date }
const result = validate(value, validations)
/* {
value: '2001',
errors:[{ wrongType: 'Date' }]
} */

`

Custom types:

`javascript

class User { ... }

const value = 'Admin'
const validations = { type: User }
const result = validate(value, validations)
/* {
value: 'Admin',
errors:[{ wrongType: 'User' }]
} */

`

Lists - Array with types:

It is possible to validate the type of elements of an array. Just use [type].

`javascript
const value = ['2']
const validations = { type: [Number] }
const result = validate(value, validations)
/* {
value: ['2'],
errors:[{ wrongType: ['Number'] }]
} */
`


#### Javascript Identifier

The javascript identifier validator ensures that the input is a valid javascript identifier. Javascript identifiers validator rules can be found here.


`javascript
const value = "1GetTest"
const validations = { javascriptIdentifier: true }
const result = validate(value, validations)
/* {
value: '1GetTest',
errors: [{ invalidJavascriptIdentifier: true }]
} */
`

#### URL

The URL validator ensures that the input is a valid URL. Validating URLs are pretty tricky but this validator is inspired on a gist that can be found here.

The following options are supported:

schemes - (array of string) A list of schemes to allow. If you want to support any scheme you can use a regexp here (for example [".+"]). The default value is ["http", "https"].

allowLocal (boolean) - A boolean that if true allows local hostnames such as 10.0.1.1 or localhost. The default is false.

allowDataUrl (boolean) - A boolean that if true allows data URLs as defined in RFC 2397. The default is false

`javascript
const value = "google.com"
const validations = { url: true }
const result = validate(value, validations)
/* {
value: 'google.com',
errors: [{ invalidURL: true }]
} */

const value = "http://localhost"
const validations = { url: {allowLocal: true} }
const result = validate(value, validations)
/* {
value: 'http://localhost',
errors: []
} */

const options = {schemes: ['ftp']}
const value = "ftp://google.com"
const validations = { url: options }
const result = validate(value, validations)
/* {
value: 'ftp://google.com',
errors: []
} */
`




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Execute custom functions to specific validations cases

propName (string) - Name of the validation rule returned on error - this is optional, see below example of usage

validation (function: boolean) - Function that will be called with value argument this is optional, see below example of usage

`javascript

const cardNumber = "123467890123456"
// Single function validation with valid value
const validations = { custom: { invalidCardNumber: (value) => value.length === 16 } }
const result = validate(cardNumber, validations);
/* {
value: '123467890123456',
errors: []
} */
//

const cardNumber = "1234"

// Single function validation with invalid value
const validations = { custom: { invalidCardNumber: (value) => value.length === 16 } }
const result = validate(cardNumber, validations);
/* {
value: '1234',
errors: [{ "invalidCardNumber": true }]
} */
//

// Multiple functions validation with invalid value
const validations = {
custom: {
invalidCardNumber: (value) => value.length === 16,
invalidDigit: (value) => value[0] !== "2",
},
}
const result = validate(cardNumber, validations)
/* {
value: '1234',
errors: [
{ "invalidCardNumber": true },
{ "invalidDigit": true },
}]
} */
//


// Multiple functions validation with parcial valid values
const cardNumber = "12345678910111213"

const validations = {
custom: {
invalidCardNumber: (value) => value.length === 16,
invalidDigit: (value) => value[0] !== "2",
},
}
const result = validate(cardNumber, validations)
/* {
value: '12345678910111213',
errors: [
{ "invalidDigit": true },
}]
} */
//

`

You can also extract validation for variables, if you want to make your code more reusable and customizable

`javascript

// Single Validation with custom propName

const cardNumber = "1234"

const propName = "invalidCardNumber";
const validation = (value) => value.length === 16
const validations = {
custom: { [propName]: validation }, }

const result = validate(cardNumber, validations);
/* {
value: '1234',
errors: [{ "invalidCardNumber": true }]
} */
//

`

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The type, length, numericality, format and datetime validators won't validate a value if it's null or undefined.

To ensure your value is not null, use allowNull: false or presence: true.

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Checkers functions inspect a value for a content conformity. Ex: Is a email? Is a array? Etc. More here: checkers click here.

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tryParse is a helper function that tries to parse a value to the expected type.

The parser uses a conservative approach. For the most standard javascript types, it will try to parse the value to the expected type, using the default javascript conversion. For example, if the type is a Number and the value is '1' (String), it will be parsed to 1 (Number).

However, types like Date or Object can generate non expected results. In order to avoid this, the parser will not try to parse non trivial conversions. The idea is to avoid surprises during development.

For Date values, for example, the parser will try to parse the value only if the string "looks like" a date. For example, if the value is 2019-01-01 (as an example, many other date formats are supported), it will be parsed to a Date object. However, if the value is 1, it will not be parsed.

Supported types: Number, String, Boolean, Date, Object, Array.

`js
const { tryParse } = require('@herbsjs/suma')

tryParse('1', Number) // 1
tryParse('1', Date) // null
tryParse('2019-01-01', Date) // Date object
`

TODO

Features:
- [ ] Allow a conditional if functions for validaton
- [ ] Be able to inject a diferent checker
- [ ] Better checks on validator's params`

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Come with us to make an awesome Suma.

Now, if you do not have technical knowledge and also have intend to help us, do not feel shy, click here to open an issue and collaborate their ideas, the contribution may be a criticism or a compliment (why not?)

If you would like to help contribute to this repository, please see CONTRIBUTING

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Suma is often called Brazilian ginseng due to it’s ability to increase strength and stamina. Like all adaptogens, suma is good for reducing the ill effects of stress.

https://www.herbslist.net/

https://en.wikipedia.org/wiki/Pfaffia_glomerata

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Suma is released under the
MIT license.