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make.go
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make.go
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// Copyright 2022 Gregory Petrosyan <gregory.petrosyan@gmail.com>
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at https://mozilla.org/MPL/2.0/.
package rapid
import (
"fmt"
"reflect"
)
func Make[V any]() *Generator[V] {
var zero V
gen := newMakeGen(reflect.TypeOf(zero))
return newGenerator[V](&makeGen[V]{
gen: gen,
})
}
type makeGen[V any] struct {
gen *Generator[any]
}
func (g *makeGen[V]) String() string {
var zero V
return fmt.Sprintf("Make[%T]()", zero)
}
func (g *makeGen[V]) value(t *T) V {
return g.gen.value(t).(V)
}
func newMakeGen(typ reflect.Type) *Generator[any] {
switch typ.Kind() {
case reflect.Bool:
return Bool().AsAny()
case reflect.Int:
return Int().AsAny()
case reflect.Int8:
return Int8().AsAny()
case reflect.Int16:
return Int16().AsAny()
case reflect.Int32:
return Int32().AsAny()
case reflect.Int64:
return Int64().AsAny()
case reflect.Uint:
return Uint().AsAny()
case reflect.Uint8:
return Uint8().AsAny()
case reflect.Uint16:
return Uint16().AsAny()
case reflect.Uint32:
return Uint32().AsAny()
case reflect.Uint64:
return Uint64().AsAny()
case reflect.Uintptr:
return Uintptr().AsAny()
case reflect.Float32:
return Float32().AsAny()
case reflect.Float64:
return Float64().AsAny()
case reflect.Array:
return genAnyArray(typ)
case reflect.Map:
return genAnyMap(typ)
case reflect.Pointer:
return Deferred(func() *Generator[any] { return genAnyPointer(typ) })
case reflect.Slice:
return genAnySlice(typ)
case reflect.String:
return String().AsAny()
case reflect.Struct:
return genAnyStruct(typ)
default:
panic(fmt.Sprintf("unsupported type kind for Make: %v", typ.Kind()))
}
}
func genAnyPointer(typ reflect.Type) *Generator[any] {
elem := typ.Elem()
elemGen := newMakeGen(elem)
const pNonNil = 0.5
return Custom[any](func(t *T) any {
if flipBiasedCoin(t.s, pNonNil) {
val := elemGen.value(t)
ptr := reflect.New(elem)
ptr.Elem().Set(reflect.ValueOf(val))
return ptr.Interface()
} else {
return reflect.Zero(typ).Interface()
}
})
}
func genAnyArray(typ reflect.Type) *Generator[any] {
count := typ.Len()
elemGen := newMakeGen(typ.Elem())
return Custom[any](func(t *T) any {
a := reflect.Indirect(reflect.New(typ))
if count == 0 {
t.s.drawBits(0)
} else {
for i := 0; i < count; i++ {
e := reflect.ValueOf(elemGen.value(t))
a.Index(i).Set(e)
}
}
return a.Interface()
})
}
func genAnySlice(typ reflect.Type) *Generator[any] {
elemGen := newMakeGen(typ.Elem())
return Custom[any](func(t *T) any {
repeat := newRepeat(-1, -1, -1, elemGen.String())
sl := reflect.MakeSlice(typ, 0, repeat.avg())
for repeat.more(t.s) {
e := reflect.ValueOf(elemGen.value(t))
sl = reflect.Append(sl, e)
}
return sl.Interface()
})
}
func genAnyMap(typ reflect.Type) *Generator[any] {
keyGen := newMakeGen(typ.Key())
valGen := newMakeGen(typ.Elem())
return Custom[any](func(t *T) any {
label := keyGen.String() + "," + valGen.String()
repeat := newRepeat(-1, -1, -1, label)
m := reflect.MakeMapWithSize(typ, repeat.avg())
for repeat.more(t.s) {
k := reflect.ValueOf(keyGen.value(t))
v := reflect.ValueOf(valGen.value(t))
if m.MapIndex(k).IsValid() {
repeat.reject()
} else {
m.SetMapIndex(k, v)
}
}
return m.Interface()
})
}
func genAnyStruct(typ reflect.Type) *Generator[any] {
numFields := typ.NumField()
fieldGens := make([]*Generator[any], numFields)
for i := 0; i < numFields; i++ {
fieldGens[i] = newMakeGen(typ.Field(i).Type)
}
return Custom[any](func(t *T) any {
s := reflect.Indirect(reflect.New(typ))
for i := 0; i < numFields; i++ {
f := reflect.ValueOf(fieldGens[i].value(t))
s.Field(i).Set(f)
}
return s.Interface()
})
}