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arithmetic.go
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arithmetic.go
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package main
import "strconv"
import "strings"
import "math"
import "fmt"
type Int struct {
Value int
}
type Float struct {
Value float64
}
type Adder interface {
Plus(a Data) Data
}
type Subtracter interface {
Minus(a Data) Data
}
type Multiplyer interface {
Multiply(a Data) Data
}
type Divider interface {
Divide(a Data) Data
}
type Comparer interface {
// comparing two items with one another. Returns the result
// of the comparison and a bool indicating whether the items
// are comparable at all.
// * !comparible => comparison = 0
// * this < a => comparison < 0
// * this > a => comparison > 0
// * this == a => comparison = 0
Compare(a Data) (comparison int, comparible bool)
}
func (i Int) Plus(a Data) Data {
switch num := a.(type) {
case Int:
return Int{i.Value + num.Value}
case Float:
return Float{float64(i.Value) + num.Value}
}
panic("Addition only works with Ints and Floats")
}
func (i Int) Minus(a Data) Data {
switch num := a.(type) {
case Int:
return Int{i.Value - num.Value}
case Float:
return Float{float64(i.Value) - num.Value}
}
panic("Subtraction only works with Ints and Floats")
}
func (i Int) Multiply(a Data) Data {
switch num := a.(type) {
case Int:
return Int{i.Value * num.Value}
case Float:
return Float{float64(i.Value) * num.Value}
case String:
return String{strings.Repeat(num.Value, i.Value)}
}
panic("Multiplication only works with Ints and Floats, or Strings")
}
func (s String) Multiply(a Data) Data {
switch t := a.(type) {
case Int:
return String{strings.Repeat(s.Value, t.Value)}
}
panic("Strings can only be multiplied with Ints")
}
func (s String) Plus(a Data) Data {
switch t := a.(type) {
case String:
return String{s.Value + t.Value}
default:
return String{s.Value + t.String()}
}
}
func (i Int) Divide(a Data) Data {
switch num := a.(type) {
case Int:
return Int{i.Value / num.Value}
case Float:
return Float{float64(i.Value) / num.Value}
}
panic("Division only works with Ints and Floats")
}
func (f Float) Plus(a Data) Data {
switch num := a.(type) {
case Int:
return Float{f.Value + float64(num.Value)}
case Float:
return Float{f.Value + num.Value}
}
panic("Addition only works with Ints and Floats")
}
func (f Float) Minus(a Data) Data {
switch num := a.(type) {
case Int:
return Float{f.Value - float64(num.Value)}
case Float:
return Float{f.Value - num.Value}
}
panic("Subtraction only works with Ints and Floats")
}
func (f Float) Multiply(a Data) Data {
switch num := a.(type) {
case Int:
return Float{f.Value * float64(num.Value)}
case Float:
return Float{f.Value * num.Value}
}
panic("Multiplication only works with Ints and Floats")
}
func (f Float) Divide(a Data) Data {
switch num := a.(type) {
case Int:
return Float{f.Value / float64(num.Value)}
case Float:
return Float{f.Value / num.Value}
}
panic("Division only works with Ints and Floats")
}
//=============================================================================
// Native functions
//=============================================================================
func _plus(args List, context *Context) Data {
args.RequireArity(2)
sum, ok := args.First().(Adder)
if !ok {
panic("Operand not supported")
}
for e := args.Front().Next(); e != nil; e = e.Next() {
sum = sum.Plus(e.Value.(Data)).(Adder)
}
return sum.(Data)
}
func _minus(args List, context *Context) Data {
args.RequireArity(2)
sum, ok := args.First().(Subtracter)
if !ok {
panic("Operand not supported")
}
for e := args.Front().Next(); e != nil; e = e.Next() {
sum = sum.Minus(e.Value.(Data)).(Subtracter)
}
return sum.(Data)
}
func _multiply(args List, context *Context) Data {
args.RequireArity(2)
sum, ok := args.First().(Multiplyer)
if !ok {
panic("Operand not supported")
}
for e := args.Front().Next(); e != nil; e = e.Next() {
sum = sum.Multiply(e.Value.(Data)).(Multiplyer)
}
return sum.(Data)
}
func _divide(args List, context *Context) Data {
args.RequireArity(2)
sum, ok := args.First().(Divider)
if !ok {
panic("Operand not supported")
}
for e := args.Front().Next(); e != nil; e = e.Next() {
sum = sum.Divide(e.Value.(Data)).(Divider)
}
return sum.(Data)
}
func _compare(args List, context *Context) Data {
args.RequireArity(2)
a, ok := args.First().(Comparer)
if !ok {
panic("Left operand is not comparable")
}
comp, ok := a.Compare(args.Second())
if !ok {
panic(fmt.Sprintf("Right operand cannot be compared to %s", args.First().GetType().String()))
}
return Int{comp}
}
func _lesser_than(args List, context *Context) Data {
args.RequireArity(2)
operand, ok := args.First().(Comparer)
if !ok {
panic("Left operand is not comparable")
}
for e := args.Front().Next(); e != nil; e = e.Next() {
comparison, comparable := operand.Compare(e.Value.(Data))
if !comparable || comparison >= 0 {
return Bool{false}
}
operand = e.Value.(Comparer)
}
return Bool{true}
}
func _greater_than(args List, context *Context) Data {
args.RequireArity(2)
operand, ok := args.First().(Comparer)
if !ok {
panic("Left operand is not comparable")
}
for e := args.Front().Next(); e != nil; e = e.Next() {
comparison, comparable := operand.Compare(e.Value.(Data))
if !comparable || comparison <= 0 {
return Bool{false}
}
operand = e.Value.(Comparer)
}
return Bool{true}
}
func _lesser_than_or_equal(args List, context *Context) Data {
args.RequireArity(2)
operand, ok := args.First().(Comparer)
if !ok {
panic("Left operand is not comparable")
}
for e := args.Front().Next(); e != nil; e = e.Next() {
comparison, comparable := operand.Compare(e.Value.(Data))
if !comparable || comparison > 0 {
return Bool{false}
}
operand = e.Value.(Comparer)
}
return Bool{true}
}
func _greater_than_or_equal(args List, context *Context) Data {
args.RequireArity(2)
operand, ok := args.First().(Comparer)
if !ok {
panic("Left operand is not comparable")
}
for e := args.Front().Next(); e != nil; e = e.Next() {
comparison, comparable := operand.Compare(e.Value.(Data))
if !comparable || comparison < 0 {
return Bool{false}
}
operand = e.Value.(Comparer)
}
return Bool{true}
}
//=============================================================================
// Comparison
//=============================================================================
func (i Int) Compare(a Data) (int, bool) {
switch t := a.(type) {
case Int:
return i.Value - t.Value, true
case Float:
diff := float64(i.Value) - t.Value
if diff < 0 {
return int(math.Min(diff, -1)), true
} else if diff > 0 {
return int(math.Max(diff, 1)), true
} else {
return 0, true
}
}
return 0, false
}
func (f Float) Compare(a Data) (int, bool) {
switch t := a.(type) {
case Int:
diff := f.Value - float64(t.Value)
if diff < 0 {
return int(math.Min(diff, -1)), true
} else if diff > 0 {
return int(math.Max(diff, 1)), true
} else {
return 0, true
}
case Float:
diff := f.Value - t.Value
if diff < 0 {
return int(math.Min(diff, -1)), true
} else if diff > 0 {
return int(math.Max(diff, 1)), true
} else {
return 0, true
}
}
return 0, false
}
//=============================================================================
// String conversion
//=============================================================================
func (i Int) String() string {
return strconv.FormatInt(int64(i.Value), 10)
}
func (f Float) String() string {
return strconv.FormatFloat(f.Value, 'g', -1, 64)
}