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package pointer
import (
"math/rand"
"git.adyxax.org/adyxax/gofunge/pkg/field"
)
type InputFunction func() int
type OutputFunction func(v int)
type Pointer struct {
// the position
x int
y int
// The delta
dx int
dy int
// The Storage offset
sox int
soy int
// The stringmode flag
stringMode bool
lastCharWasSpace bool
// The stack
ss *StackStack
// The next element for the multi-"threaded" b98 interpreter
Next *Pointer
// The input/output functions
CharacterInput InputFunction
DecimalInput InputFunction
CharacterOutput OutputFunction
DecimalOutput OutputFunction
}
func NewPointer() *Pointer {
return &Pointer{
dx: 1,
ss: NewStackStack(),
CharacterInput: DefaultCharacterInput,
DecimalInput: DefaultDecimalInput,
CharacterOutput: DefaultCharacterOutput,
DecimalOutput: DefaultDecimalOutput,
}
}
func (p Pointer) Split() *Pointer {
return &p // p is already a copy TODO we need to duplicate the stack and handle the Next
}
func (p *Pointer) Step(f field.Field) {
p.x, p.y = f.Step(p.x, p.y, p.dx, p.dy)
}
func (p Pointer) Get(f field.Field) int {
return f.Get(p.x, p.y)
}
func (p *Pointer) StepAndGet(f field.Field) int {
p.Step(f)
return p.Get(f)
}
func (p *Pointer) Set(x, y int) {
p.x, p.y = x, y
}
func (p *Pointer) RedirectTo(dx, dy int) {
p.dx, p.dy = dx, dy
}
func (p *Pointer) Reverse() {
p.dx, p.dy = -p.dx, -p.dy
}
func (p *Pointer) Redirect(c int) bool {
switch c {
case '^':
p.dx, p.dy = 0, -1
case '>':
p.dx, p.dy = 1, 0
case 'v':
p.dx, p.dy = 0, 1
case '<':
p.dx, p.dy = -1, 0
case '?':
directions := []int{0, -1, 1, 0, 0, 1, -1, 0}
r := 2 * rand.Intn(4)
p.dx, p.dy = directions[r], directions[r+1]
case '[':
p.dx, p.dy = p.dy, -p.dx
case ']':
p.dx, p.dy = -p.dy, p.dx
case 'r':
p.Reverse()
case 'x':
dy := p.ss.head.Pop()
dx := p.ss.head.Pop()
p.RedirectTo(dx, dy)
default:
return false
}
return true
}
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