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boolean.go
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boolean.go
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package vm
import (
"fmt"
)
var (
booleanClass *RBool
// TRUE is shared boolean object that represents true
TRUE *BooleanObject
// FALSE is shared boolean object that represents false
FALSE *BooleanObject
)
// RBool is the built in class of goby's boolean objects.
type RBool struct {
*BaseClass
}
// BooleanObject represents boolean object in goby.
// It includes `true` and `FALSE` which represents logically true and false value.
type BooleanObject struct {
Class *RBool
Value bool
}
// toString returns boolean object's value, which is either true or false.
func (b *BooleanObject) toString() string {
return fmt.Sprintf("%t", b.Value)
}
func (b *BooleanObject) toJSON() string {
return b.toString()
}
// returnClass returns boolean object's class, which is RBool
func (b *BooleanObject) returnClass() Class {
return b.Class
}
func (b *BooleanObject) equal(e *BooleanObject) bool {
return b.Value == e.Value
}
var builtinBooleanInstanceMethods = []*BuiltInMethodObject{
{
// Returns true if the receiver equals to the argument.
//
// ```Ruby
// 1 == 1 # => true
// 100 == 33 # => false
// ```
// @return [Boolean]
Name: "==",
Fn: func(receiver Object) builtinMethodBody {
return func(t *thread, args []Object, blockFrame *callFrame) Object {
err := checkArgumentLen(args, booleanClass, "==")
if err != nil {
return err
}
if receiver == args[0] {
return TRUE
}
return FALSE
}
},
},
{
// Returns true if the receiver is not equals to the argument.
//
// ```Ruby
// 4 != 2 # => true
// 45 != 45 # => false
// ```
// @return [Boolean]
Name: "!=",
Fn: func(receiver Object) builtinMethodBody {
return func(t *thread, args []Object, blockFrame *callFrame) Object {
err := checkArgumentLen(args, booleanClass, "!=")
if err != nil {
return err
}
if receiver != args[0] {
return TRUE
}
return FALSE
}
},
},
{
// Reverse the receiver.
//
// ```ruby
// !true # => false
// !false # => true
// ```
// @return [Boolean]
Name: "!",
Fn: func(receiver Object) builtinMethodBody {
return func(t *thread, args []Object, blockFrame *callFrame) Object {
rightValue := receiver.(*BooleanObject).Value
if rightValue {
return FALSE
}
return TRUE
}
},
},
{
// Returns true if both the receiver and the argument are true.
//
// ```ruby
// 3 > 2 && 5 > 3 # => true
// 3 > 2 && 5 > 10 # => false
// ```
// @return [Boolean]
Name: "&&",
Fn: func(receiver Object) builtinMethodBody {
return func(t *thread, args []Object, blockFrame *callFrame) Object {
leftValue := receiver.(*BooleanObject).Value
right, ok := args[0].(*BooleanObject)
if !ok {
return wrongTypeError(booleanClass)
}
rightValue := right.Value
if leftValue && rightValue {
return TRUE
}
return FALSE
}
},
},
{
// Returns true either if the receiver or argument is true.
//
// ```ruby
// 3 > 2 || 5 > 3 # => true
// 3 > 2 || 5 > 10 # => true
// 2 > 3 || 5 > 10 # => false
// ```
// @return [Boolean]
Name: "||",
Fn: func(receiver Object) builtinMethodBody {
return func(t *thread, args []Object, blockFrame *callFrame) Object {
leftValue := receiver.(*BooleanObject).Value
right, ok := args[0].(*BooleanObject)
if !ok {
return wrongTypeError(booleanClass)
}
rightValue := right.Value
if leftValue || rightValue {
return TRUE
}
return FALSE
}
},
},
}
func initBoolClass() {
bc := &BaseClass{Name: "Boolean", Methods: newEnvironment(), ClassMethods: newEnvironment(), Class: classClass, pseudoSuperClass: objectClass, superClass: objectClass}
b := &RBool{BaseClass: bc}
b.setBuiltInMethods(builtinBooleanInstanceMethods, false)
booleanClass = b
TRUE = &BooleanObject{Value: true, Class: booleanClass}
FALSE = &BooleanObject{Value: false, Class: booleanClass}
}