package core

import (
	"git.akyoto.dev/cli/q/src/build/cpu"
	"git.akyoto.dev/cli/q/src/build/expression"
)

// Variable represents a named register.
type Variable struct {
	Value    *expression.Expression
	Name     string
	Register cpu.Register
	Alive    int
}

// Variable returns the variable with the given name or `nil` if it doesn't exist.
func (s *state) Variable(name string) *Variable {
	return s.Scope().variables[name]
}

// VariableInRegister returns the variable that occupies the given register or `nil` if none occupy the register.
func (s *state) VariableInRegister(register cpu.Register) *Variable {
	for _, v := range s.Scope().variables {
		if v.Register == register {
			return v
		}
	}

	return nil
}