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interpreter.go
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interpreter.go
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package interpreter
import (
"fmt"
intstack "github.com/colinwilcox1967/intstack"
)
const (
MOVE_UP int = 0
MOVE_DOWN int = 1
MOVE_LEFT int = 2
MOVE_RIGHT int = 3
)
// extra stack operations
func AddTopStack(s *intstack.IntStack) bool {
if s.Size() >= 2 {
var val1 = s.Pop()
var val2 = s.Pop()
s.Push(val1 + val2)
return true
}
return false
}
func SubtractTopStack(s *intstack.IntStack) bool {
if s.Size() >= 2 {
var val1 = s.Pop()
var val2 = s.Pop()
s.Push(val2 - val1)
return true
}
return false
}
func MultiplyTopStack(s *intstack.IntStack) bool {
if s.Size() >= 2 {
var val1 = s.Pop()
var val2 = s.Pop()
s.Push(val2 * val1)
return true
}
return false
}
func DivideTopStack(s *intstack.IntStack) bool {
if s.Size() >= 2 {
val1 := s.Pop()
val2 := s.Pop()
if val1 == 0 {
s.Push(0)
} else {
s.Push(val2 / val1)
}
return true
}
return false
}
func ModTopStack(s *intstack.IntStack) bool {
if s.Size() >= 2 {
var val1 = s.Pop()
var val2 = s.Pop()
s.Push(val2 % val1)
return true
}
return false
}
func LogicalNot(s *intstack.IntStack) {
var val = s.Pop()
if val == 0 {
s.Push(1)
} else {
s.Push(0)
}
}
func DuplicateTopStack(s *intstack.IntStack) bool {
if s.Size() >= 1 {
s.Push(s.Peek())
return true
}
return false
}
func ExchangeTopStack(s *intstack.IntStack) bool {
if s.Size() >= 2 {
var val1 = s.Pop()
var val2 = s.Pop()
s.Push(val1)
s.Push(val2)
return true
}
return false
}
func PopAndDisplayAsInt(s *intstack.IntStack) {
var val = s.Pop()
fmt.Printf("%d ", val)
}
func PopAndDisplayAsASCII(s *intstack.IntStack) {
var val = s.Pop()
fmt.Printf("%c", val)
}