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package subex
import (
"fmt"
"math"
)
type NumberExpr interface {
String() string
Eval(float64) float64
}
type NumberExprVariable struct {}
func (ev NumberExprVariable) String() string {
return "n"
}
func (ev NumberExprVariable) Eval(v float64) float64 {
return v
}
type NumberExprLiteral struct {
Value float64
}
func (el NumberExprLiteral) String() string {
return fmt.Sprintf("%v", el.Value)
}
func (el NumberExprLiteral) Eval(v float64) float64 {
return el.Value
}
type NumberExprAnd struct {
Left NumberExpr
Right NumberExpr
}
func (ea NumberExprAnd) String() string {
return fmt.Sprintf("(%v & %v)", ea.Left, ea.Right)
}
func (ea NumberExprAnd) Eval(v float64) float64 {
left := ea.Left.Eval(v)
if left != 0.0 {
return ea.Right.Eval(v)
} else {
return left
}
}
type NumberExprOr struct {
Left NumberExpr
Right NumberExpr
}
func (eo NumberExprOr) String() string {
return fmt.Sprintf("(%v | %v)", eo.Left, eo.Right)
}
func (eo NumberExprOr) Eval(v float64) float64 {
left := eo.Left.Eval(v)
if left != 0.0 {
return left
} else {
return eo.Right.Eval(v)
}
}
type NumberExprNot struct {
Right NumberExpr
}
func (en NumberExprNot) String() string {
return fmt.Sprintf("(!%v)", en.Right)
}
func (en NumberExprNot) Eval(v float64) float64 {
inner := en.Right.Eval(v)
if inner == 0.0 {
return 1.0
}
return 0.0
}
type NumberExprEqual struct {
Left NumberExpr
Right NumberExpr
}
func (ee NumberExprEqual) String() string {
return fmt.Sprintf("(%v = %v)", ee.Left, ee.Right)
}
func (ee NumberExprEqual) Eval(v float64) float64 {
if ee.Left.Eval(v) == ee.Right.Eval(v) {
return 1.0
} else {
return 0.0
}
}
type NumberExprAtMost struct {
Left NumberExpr
Right NumberExpr
}
func (ea NumberExprAtMost) String() string {
return fmt.Sprintf("(%v <= %v)", ea.Left, ea.Right)
}
func (ea NumberExprAtMost) Eval(v float64) float64 {
if ea.Left.Eval(v) <= ea.Right.Eval(v) {
return 1.0
} else {
return 0.0
}
}
type NumberExprLessThan struct {
Left NumberExpr
Right NumberExpr
}
func (el NumberExprLessThan) String() string {
return fmt.Sprintf("(%v < %v)", el.Left, el.Right)
}
func (el NumberExprLessThan) Eval(v float64) float64 {
if el.Left.Eval(v) < el.Right.Eval(v) {
return 1.0
} else {
return 0.0
}
}
type NumberExprGreaterThan struct {
Left NumberExpr
Right NumberExpr
}
func (eg NumberExprGreaterThan) String() string {
return fmt.Sprintf("(%v > %v)", eg.Left, eg.Right)
}
func (eg NumberExprGreaterThan) Eval(v float64) float64 {
if eg.Left.Eval(v) > eg.Right.Eval(v) {
return 1.0
} else {
return 0.0
}
}
type NumberExprAtLeast struct {
Left NumberExpr
Right NumberExpr
}
func (ea NumberExprAtLeast) String() string {
return fmt.Sprintf("(%v >= %v)", ea.Left, ea.Right)
}
func (ea NumberExprAtLeast) Eval(v float64) float64 {
if ea.Left.Eval(v) >= ea.Right.Eval(v) {
return 1.0
} else {
return 0.0
}
}
type NumberExprAdd struct {
Left NumberExpr
Right NumberExpr
}
func (ea NumberExprAdd) String() string {
return fmt.Sprintf("(%v + %v)", ea.Left, ea.Right)
}
func (ea NumberExprAdd) Eval(v float64) float64 {
return ea.Left.Eval(v) + ea.Right.Eval(v)
}
type NumberExprSubtract struct {
Left NumberExpr
Right NumberExpr
}
func (es NumberExprSubtract) String() string {
return fmt.Sprintf("(%v - %v)", es.Left, es.Right)
}
func (es NumberExprSubtract) Eval(v float64) float64 {
return es.Left.Eval(v) - es.Right.Eval(v)
}
type NumberExprMultiply struct {
Left NumberExpr
Right NumberExpr
}
func (em NumberExprMultiply) String() string {
return fmt.Sprintf("(%v * %v)", em.Left, em.Right)
}
func (em NumberExprMultiply) Eval(v float64) float64 {
return em.Left.Eval(v) * em.Right.Eval(v)
}
type NumberExprDivide struct {
Left NumberExpr
Right NumberExpr
}
func (ed NumberExprDivide) String() string {
return fmt.Sprintf("(%v / %v)", ed.Left, ed.Right)
}
func (ed NumberExprDivide) Eval(v float64) float64 {
return ed.Left.Eval(v) / ed.Right.Eval(v)
}
type NumberExprMod struct {
Left NumberExpr
Right NumberExpr
}
func (em NumberExprMod) String() string {
return fmt.Sprintf("(%v %% %v)", em.Left, em.Right)
}
func (em NumberExprMod) Eval(v float64) float64 {
return math.Mod(em.Left.Eval(v), em.Right.Eval(v))
}
type NumberExprExponent struct {
Left NumberExpr
Right NumberExpr
}
func (ee NumberExprExponent) String() string {
return fmt.Sprintf("(%v * %v)", ee.Left, ee.Right)
}
func (ee NumberExprExponent) Eval(v float64) float64 {
return ee.Left.Eval(v) * ee.Right.Eval(v)
}
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