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package main
type AnySegmentPathFilter struct {
next PathFilterState
}
func (filter AnySegmentPathFilter) eat(segment PathSegment) map[PathFilterState]struct{} {
res := make(map[PathFilterState]struct{})
res[filter.next] = struct{}{}
return res
}
func (filter AnySegmentPathFilter) accept() bool {
return false
}
type OrPathFilter struct {
filters [2]PathFilterState
}
func (filter OrPathFilter) eat(segment PathSegment) map[PathFilterState]struct{} {
res := make(map[PathFilterState]struct{})
for _, f := range filter.filters {
for r := range f.eat(segment) {
res[r] = struct{}{}
}
}
return res
}
func (filter OrPathFilter) accept() bool {
for _, f := range filter.filters {
if f.accept() {
return true
}
}
return false
}
type NonePathFilter struct {}
func (filter NonePathFilter) eat(segment PathSegment) map[PathFilterState]struct{} {
return make(map[PathFilterState]struct{})
}
func (filter NonePathFilter) accept() bool {
return true
}
type StringSegmentPathFilter struct {
index string
next PathFilterState
}
func (filter StringSegmentPathFilter) eat(segment PathSegment) map[PathFilterState]struct{} {
s, isString := segment.(string)
res := make(map[PathFilterState]struct{})
if isString && s == filter.index {
res[filter.next] = struct{}{}
}
return res
}
func (filter StringSegmentPathFilter) accept() bool {
return false
}
type IntegerSegmentPathFilter struct {
index int
next PathFilterState
}
func (filter IntegerSegmentPathFilter) eat(segment PathSegment) map[PathFilterState]struct{} {
i, isInteger := segment.(int)
res := make(map[PathFilterState]struct{})
if isInteger && i == filter.index {
res[filter.next] = struct{}{}
}
return res
}
func (filter IntegerSegmentPathFilter) accept() bool {
return false
}
type PathFilterState interface {
eat(PathSegment) map[PathFilterState]struct{}
accept() bool
}
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