v/vlib/toml/tests/encode_and_decode_test.v

import toml

enum JobTitle {
	worker
	executive
	manager
}

struct Pet {
	name      string
	nicknames []string
	age       u64
	income    int
	height    f32
	has_furr  bool
	title     JobTitle
	address   Address
	// *¹ Currently it is only possible to decode a single nested struct generically.
	// As soon as we decode another nested struct (e.g. within this struct, like `contact` below)
	// or only one nested struct within another struct, it results in wrong values or errors.
	// Related issue: https://github.com/vlang/v/issues/18110
	// contact Contact
}

struct Address {
	street string
	city   string
}

// *¹
/*
struct Contact {
	phone string
}*/

struct Employee {
mut:
	name     string
	age      int
	salary   f32
	is_human bool
	title    JobTitle
}

struct Arrs {
	strs  []string
	bools []bool
	ints  []int
	i64s  []i64
	u64s  []u64
	f32s  []f32
	f64s  []f64
	dts   []toml.DateTime
	dates []toml.Date
	times []toml.Time
}

fn test_encode_and_decode() {
	// *¹
	// p := Pet{'Mr. Scratchy McEvilPaws', ['Freddy', 'Fred', 'Charles'], 8, -1, 0.8, true, .manager, Address{'1428 Elm Street', 'Springwood'}, Contact{'123-456-7890'}}
	p := Pet{'Mr. Scratchy McEvilPaws', ['Freddy', 'Fred', 'Charles'], 8, -1, 0.8, true, .manager, Address{'1428 Elm Street', 'Springwood'}}
	s := 'name = "Mr. Scratchy McEvilPaws"
nicknames = [
  "Freddy",
  "Fred",
  "Charles"
]
age = 8
income = -1
height = 0.8
has_furr = true
title = 2
address = { street = "1428 Elm Street", city = "Springwood" }'
	// contact = { phone = "123-456-7890" }' // *¹

	assert toml.encode[Pet](p) == s
	assert toml.decode[Pet](s)! == p
}

pub fn (e Employee) to_toml() string {
	mut mp := map[string]toml.Any{}
	mp['name'] = toml.Any(e.name)
	mp['age'] = toml.Any(e.age)
	mp['salary'] = toml.Any(f32(e.salary) + 5000.0)
	mp['is_human'] = toml.Any(e.is_human)
	mp['title'] = toml.Any(int(e.title) + 1)
	return mp.to_toml()
}

pub fn (mut e Employee) from_toml(any toml.Any) {
	mp := any.as_map()
	e.name = mp['name'] or { toml.Any('') }.string()
	e.age = mp['age'] or { toml.Any(0) }.int()
	e.is_human = mp['is_human'] or { toml.Any(false) }.bool()
	// Change some values to assert that the structs method is used instead of generic decoding.
	e.salary = mp['salary'] or { toml.Any(0) }.f32() - 15000.0
	e.title = unsafe { JobTitle(mp['title'] or { toml.Any(0) }.int() - 2) }
}

fn test_custom_encode_and_decode() {
	x := Employee{'Peter', 28, 95000.5, true, .executive}
	s := toml.encode[Employee](x)
	eprintln('Employee x: ${s}')
	assert s == r'name = "Peter"
age = 28
salary = 100000.5
is_human = true
title = 2'

	y := toml.decode[Employee](s) or {
		println(err)
		assert false
		return
	}
	eprintln('Employee y: ${y}')
	assert y.name == 'Peter'
	assert y.age == 28
	assert y.salary == 85000.5
	assert y.is_human == true
	assert y.title == .worker
}

fn test_array_encode_decode() {
	a := Arrs{
		strs: ['foo', 'bar']
		bools: [true, false]
		ints: [-1, 2]
		i64s: [i64(-2)]
		u64s: [u64(123)]
		f32s: [f32(1.0), f32(2.5)]
		f64s: [100000.5, -123.0]
		dts: [toml.DateTime{'1979-05-27T07:32:00Z'}, toml.DateTime{'1979-05-27T07:32:00Z'}]
		dates: [toml.Date{'1979-05-27'}, toml.Date{'2022-12-31'}]
		times: [toml.Time{'07:32:59'}, toml.Time{'17:32:04'}]
	}

	s := 'strs = [
  "foo",
  "bar"
]
bools = [
  true,
  false
]
ints = [
  -1,
  2
]
i64s = [
  -2
]
u64s = [
  123
]
f32s = [
  1.0,
  2.5
]
f64s = [
  100000.5,
  -123.0
]
dts = [
  1979-05-27T07:32:00Z,
  1979-05-27T07:32:00Z
]
dates = [
  1979-05-27,
  2022-12-31
]
times = [
  07:32:59,
  17:32:04
]'

	assert toml.encode[Arrs](a) == s
	assert toml.decode[Arrs](s)! == a
}