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v/vlib/compiler/tests/option_test.v

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fn opt_err_with_code() ?string {return error_with_code('hi',137)}
fn test_err_with_code(){
v := opt_err_with_code() or {
assert err == 'hi'
assert errcode == 137
return
}
assert false
println(v) // suppress not used error
}
fn opt_err() ?string {return error('hi')}
fn test_err(){
v := opt_err() or {
assert err == 'hi'
return
}
assert false
println(v) // suppress not used error
}
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fn err_call(ok bool) ?int {
if !ok {
return error('Not ok!')
}
return 42
}
fn ret_none() ?int {
//return error('wtf') //none
return none
}
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fn test_option_for_base_type_without_variable() {
val := err_call(true) or {
panic(err)
}
assert val == 42
println('hm')
val2 := ret_none() or {
println('yep')
return
}
println('$val2 should have been `none`')
assert false
// This is invalid:
// x := 5 or {
// return
// }
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}
fn test_if_opt() {
if val := err_call(false) {
assert val == 42
}
assert 1 == 1
println('nice')
}
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fn for_opt_default() ?string {
return error('awww')
}
fn test_opt_default() {
a := for_opt_default() or {
// panic(err)
'default'
}
assert a == 'default'
}
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fn foo_ok() ?int {
return 777
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}
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fn foo_str() ?string {
return 'something'
}
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fn test_q() {
//assert foo_ok()? == true
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}
struct Person {
mut:
name string
age int
title ?string
}
fn test_field_or() {
name := foo_str() or {
'nada'
}
assert name == 'something'
mut p := Person {}
p.name = foo_str() or {
'nothing'
}
assert p.name == 'something'
p.age = foo_ok() or {
panic('no age')
}
assert p.age == 777
mytitle := p.title or {
'default'
}
assert mytitle == 'default'
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}
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struct Thing {
mut:
opt ?int
}
fn test_opt_field() {
mut t := Thing{}
t.opt = 5
val := t.opt or { return }
assert val == 5
}
fn opt_ptr(a &int) ?&int {
if isnil(a) {
return none
}
return a
}
fn test_opt_ptr() {
a := 3
r1 := opt_ptr(&a) or {
&int(0)
}
assert r1 == &a
r2 := opt_ptr(&int(0)) or {
return
}
println('`$r2` should be none')
assert false
}
fn multi_return_opt(err bool) ?(string, string) {
if err {
return error('oops')
}
return 'hello', 'v'
}
fn test_multi_return_opt() {
a, b := multi_return_opt(false) or {
panic(err)
}
assert a == 'hello' && b == 'v'
_, _ := multi_return_opt(true) or {
assert err == 'oops'
return
}
}