goruby/goruby

package object

import "fmt"

var (
    trueClass  RubyClassObject = newClass("TrueClass", objectClass, booleanTrueMethods, nil, notInstantiatable)
    falseClass RubyClassObject = newClass("FalseClass", objectClass, booleanFalseMethods, nil, notInstantiatable)
    // TRUE represents the singleton object for the Boolean true
    TRUE RubyObject = &Boolean{Value: true}
    // FALSE represents the singleton object for the Boolean false
    FALSE RubyObject = &Boolean{Value: false}
)

func init() {
    classes.Set("TrueClass", trueClass)
    classes.Set("FalseClass", falseClass)
}

// Boolean represents a Boolean object in Ruby
type Boolean struct {
    Value bool
}

// Inspect returns the string representation of the boolean
func (b *Boolean) Inspect() string { return fmt.Sprintf("%t", b.Value) }

// Type returns the object type of the boolean
func (b *Boolean) Type() Type { return BOOLEAN_OBJ }

// Class returns the TrueClass for true, and the FalseClass otherwise
func (b *Boolean) Class() RubyClass {
    if b.Value {
        return trueClass
    }
    return falseClass
}

func (b *Boolean) hashKey() hashKey {
    var value uint64
    if b.Value {
        value = 1
    } else {
        value = 0
    }
    return hashKey{Type: b.Type(), Value: value}
}

var booleanTrueMethods = map[string]RubyMethod{
    "==": withArity(1, publicMethod(booleanEq)),
    "!=": withArity(1, publicMethod(booleanNeq)),
}

var booleanFalseMethods = map[string]RubyMethod{
    "==": withArity(1, publicMethod(booleanEq)),
    "!=": withArity(1, publicMethod(booleanNeq)),
}

func booleanEq(context CallContext, args ...RubyObject) (RubyObject, error) {
    b := context.Receiver().(*Boolean)
    right, ok := args[0].(*Boolean)
    if !ok {
        return FALSE, nil
    }
    if b.Value == right.Value {
        return TRUE, nil
    }
    return FALSE, nil
}

func booleanNeq(context CallContext, args ...RubyObject) (RubyObject, error) {
    b := context.Receiver().(*Boolean)
    right, ok := args[0].(*Boolean)
    if !ok {
        return TRUE, nil
    }
    if b.Value != right.Value {
        return TRUE, nil
    }
    return FALSE, nil
}