package subex

import (
	"main/walk"
)

type valueFilter interface {
	valueFilter(value walk.Value) bool
}

type selectScalarFilter struct {
	scalar walk.Scalar
}
func (scalar selectScalarFilter) valueFilter(value walk.Value) bool {
	return value == scalar.scalar
}

type anyNumberFilter struct {}
func (_ anyNumberFilter) valueFilter(value walk.Value) bool {
	_, isNumber := value.(walk.NumberScalar)
	return isNumber
}

type anyBoolFilter struct {}
func (_ anyBoolFilter) valueFilter(value walk.Value) bool {
	_, isBool := value.(walk.BoolScalar)
	return isBool
}

type anyValueFilter struct {}
func (_ anyValueFilter) valueFilter(value walk.Value) bool {
	return true
}

type anyArrayFilter struct {}
func (_ anyArrayFilter) valueFilter(value walk.Value) bool {
	_, isArray := value.(walk.ArrayStructure)
	return isArray
}

type anyStringFilter struct {}
func (_ anyStringFilter) valueFilter(value walk.Value) bool {
	_, isString := value.(walk.StringStructure)
	return isString
}


type runeFilter interface {
	runeFilter(r walk.StringRuneAtom) bool
}

type anyRuneFilter struct {}
func (_ anyRuneFilter) runeFilter(r walk.StringRuneAtom) bool {
	return true
}

type selectRuneFilter struct {
	r rune
}
func (f selectRuneFilter) runeFilter(r walk.StringRuneAtom) bool {
	return f.r == rune(r)
}