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package subex
import (
"main/walk"
"math"
"fmt"
)
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.NumberValue)
return isNumber
}
type anyBoolFilter struct {}
func (_ anyBoolFilter) valueFilter(value walk.Value) bool {
_, isBool := value.(walk.BoolValue)
return isBool
}
type simpleValueFilter struct {}
func (_ simpleValueFilter) valueFilter(value walk.Value) bool {
switch value := value.(type) {
case walk.NullValue:
return true
case walk.BoolValue:
return true
case walk.NumberValue:
return true
case walk.StringValue:
return true
case walk.ArrayValue:
return len(value) == 0
case walk.MapValue:
return len(value) == 0
default:
panic("Invalid value type")
}
}
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.ArrayValue)
return isArray
}
type anyMapFilter struct {}
func (_ anyMapFilter) valueFilter(value walk.Value) bool {
_, isMap := value.(walk.MapValue)
return isMap
}
type anyStringFilter struct {}
func (_ anyStringFilter) valueFilter(value walk.Value) bool {
_, isString := value.(walk.StringValue)
return isString
}
type runeFilter interface {
runeFilter(r rune) bool
}
type anyRuneFilter struct {}
func (_ anyRuneFilter) runeFilter(r rune) bool {
return true
}
type selectRuneFilter struct {
r rune
}
func (f selectRuneFilter) runeFilter(r rune) bool {
return f.r == r
}
type numberFilter interface {
add(m float64) numberFilter
multiply(m float64) numberFilter
numberFilter(n float64) bool
}
func (_ anyNumberFilter) numberFilter(n float64) bool {
return true
}
func (_ anyNumberFilter) add(m float64) numberFilter {
return anyNumberFilter{}
}
func (_ anyNumberFilter) multiply(m float64) numberFilter {
if m == 0.0 {
return equalNumberFilter {0.0}
} else {
return anyNumberFilter{}
}
}
func (_ anyNumberFilter) String() string {
return "r"
}
type divisibleNumberFilter struct {
divisor float64
target float64
}
func (d divisibleNumberFilter) numberFilter(n float64) bool {
mod := math.Mod(n, d.divisor)
if mod < 0 {
mod += d.divisor
}
return mod == d.target
}
func (d divisibleNumberFilter) add(m float64) numberFilter {
mod := math.Mod(m + d.target, d.divisor)
if mod < 0 {
mod += d.divisor
}
return divisibleNumberFilter {
divisor: d.divisor,
target: mod,
}
}
func (d divisibleNumberFilter) multiply(m float64) numberFilter {
if m == 0.0 {
return equalNumberFilter {0.0}
}
target := d.target
if m < 0 {
target = d.divisor - target
m = -m
}
return divisibleNumberFilter {
divisor: d.divisor * m,
target: target * m,
}
}
func (d divisibleNumberFilter) String() string {
return fmt.Sprintf("(x %% %v == %v)", d.divisor, d.target)
}
type andNumberFilter struct {
lhs, rhs numberFilter
}
func (a andNumberFilter) numberFilter(n float64) bool {
return a.lhs.numberFilter(n) && a.rhs.numberFilter(n)
}
func (a andNumberFilter) add(m float64) numberFilter {
return andNumberFilter {
lhs: a.lhs.add(m),
rhs: a.rhs.add(m),
}
}
func (a andNumberFilter) multiply(m float64) numberFilter {
return andNumberFilter {
lhs: a.lhs.multiply(m),
rhs: a.rhs.multiply(m),
}
}
func (a andNumberFilter) String() string {
return fmt.Sprintf("(%v && %v)", a.lhs, a.rhs)
}
type orNumberFilter struct {
lhs, rhs numberFilter
}
func (o orNumberFilter) numberFilter(n float64) bool {
return o.lhs.numberFilter(n) || o.rhs.numberFilter(n)
}
func (o orNumberFilter) String() string {
return fmt.Sprintf("(%v || %v)", o.lhs, o.rhs)
}
type notNumberFilter struct {
operand numberFilter
}
func (no notNumberFilter) numberFilter(n float64) bool {
return !no.operand.numberFilter(n)
}
func (no notNumberFilter) add(m float64) numberFilter {
return notNumberFilter {no.operand.add(m)}
}
func (no notNumberFilter) multiply(m float64) numberFilter {
return notNumberFilter {no.operand.multiply(m)}
}
func (no notNumberFilter) String() string {
return fmt.Sprintf("(!%v)", no.operand)
}
type lessThanNumberFilter struct {
rhs float64
}
func (l lessThanNumberFilter) numberFilter(n float64) bool {
return n < l.rhs
}
func (l lessThanNumberFilter) add(m float64) numberFilter {
return lessThanNumberFilter {l.rhs + m}
}
func (l lessThanNumberFilter) multiply(m float64) numberFilter {
if m > 0 {
return lessThanNumberFilter {l.rhs * m}
} else if m < 0 {
return greaterThanNumberFilter {l.rhs * m}
} else {
return equalNumberFilter {0}
}
}
func (l lessThanNumberFilter) String() string {
return fmt.Sprintf("(x < %v)", l.rhs)
}
type greaterThanNumberFilter struct {
rhs float64
}
func (g greaterThanNumberFilter) numberFilter(n float64) bool {
return n > g.rhs
}
func (g greaterThanNumberFilter) add(m float64) numberFilter {
return greaterThanNumberFilter {g.rhs + m}
}
func (g greaterThanNumberFilter) multiply(m float64) numberFilter {
if m > 0 {
return greaterThanNumberFilter {g.rhs * m}
} else if m < 0 {
return lessThanNumberFilter {g.rhs * m}
} else {
return equalNumberFilter {0}
}
}
func (g greaterThanNumberFilter) String() string {
return fmt.Sprintf("(x > %v)", g.rhs)
}
type equalNumberFilter struct {
rhs float64
}
func (e equalNumberFilter) numberFilter(n float64) bool {
return n == e.rhs
}
func (e equalNumberFilter) add(m float64) numberFilter {
return equalNumberFilter {e.rhs + m}
}
func (e equalNumberFilter) multiply(m float64) numberFilter {
return equalNumberFilter {e.rhs * m}
}
|
