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object.go
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object.go
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// Package value contains definitions
// of Elk values, classes, structs, modules etc.
package value
import (
"fmt"
"maps"
"github.com/google/go-cmp/cmp"
)
var ObjectClass *Class // ::Std::Object
type Object struct {
class *Class
instanceVariables SymbolMap // Map that stores instance variables of the value
}
func NewObjectComparer(opts *cmp.Options) cmp.Option {
return cmp.Comparer(func(x, y *Object) bool {
if x == nil && y == nil {
return true
}
if x == nil || y == nil {
return false
}
return cmp.Equal(x.class, y.class, *opts...) &&
cmp.Equal(x.instanceVariables, y.instanceVariables, *opts...)
})
}
// Class constructor option function
type ObjectOption = func(*Object)
func ObjectWithClass(class *Class) ObjectOption {
return func(o *Object) {
o.class = class
}
}
func ObjectWithInstanceVariables(ivars SymbolMap) ObjectOption {
return func(o *Object) {
o.instanceVariables = ivars
}
}
// Create a new value.
func NewObject(opts ...ObjectOption) *Object {
o := &Object{
class: ObjectClass,
instanceVariables: make(SymbolMap),
}
for _, opt := range opts {
opt(o)
}
return o
}
// Creates a new value.
func ObjectConstructor(class *Class) Value {
return &Object{
class: class,
instanceVariables: make(SymbolMap),
}
}
func (o *Object) Copy() Value {
newInstanceVariables := make(SymbolMap, len(o.instanceVariables))
maps.Copy(newInstanceVariables, o.instanceVariables)
newObject := &Object{
class: o.class,
instanceVariables: newInstanceVariables,
}
return newObject
}
func (o *Object) InstanceVariables() SymbolMap {
return o.instanceVariables
}
func (o *Object) Class() *Class {
if !o.class.IsSingleton() {
return o.class
}
return o.class.Class()
}
func (o *Object) DirectClass() *Class {
return o.class
}
func (o *Object) SingletonClass() *Class {
if o.class.IsSingleton() {
return o.class
}
singletonClass := NewClass()
singletonClass.SetSingleton()
singletonClass.Parent = o.class
o.class = singletonClass
return singletonClass
}
func (o *Object) Inspect() string {
return fmt.Sprintf(
"%s%s",
o.class.PrintableName(),
o.instanceVariables.Inspect(),
)
}