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package interpreter
import (
"git.adyxax.org/adyxax/gofunge98/pkg/field"
"git.adyxax.org/adyxax/gofunge98/pkg/pointer"
)
type Interpreter struct {
f *field.Field
p *pointer.Pointer
}
func NewInterpreter(f *field.Field, p *pointer.Pointer) *Interpreter {
return &Interpreter{f: f, p: p}
}
func (i *Interpreter) Run() int {
for i.p != nil {
if v := i.step(); v != nil {
return *v
}
}
return 0
}
func (i *Interpreter) step() *int {
var prev *pointer.Pointer = nil
for p := i.p; p != nil; p = p.Next {
done, v := p.Exec(i.f)
if v != nil {
return v
}
if done {
if prev == nil {
i.p = p.Next
} else {
prev.Next = p.Next
}
}
}
return nil
}
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