83 lines
2.0 KiB
Go
83 lines
2.0 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package selectors
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import (
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p "k8s.io/kubectl/pkg/framework/path/predicates"
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)
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// NumberS is a "number selector". It selects values as numbers (if
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// possible) and filters those numbers based on the "filtered"
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// predicates.
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type NumberS interface {
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// NumberS can be used as a Interface predicate. If the selector can't
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// select any number from the value, then the predicate is
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// false.
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p.Interface
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// SelectFrom finds numbers from values using this selector. The
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// list can be bigger or smaller than the initial lists,
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// depending on the select criterias.
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SelectFrom(...interface{}) []float64
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// Filter will create a new NumberS that filters only the values
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// who match the predicate.
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Filter(...p.Number) NumberS
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}
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// Number returns a NumberS that selects numbers from given values.
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func Number() NumberS {
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return &numberS{}
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}
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type numberS struct {
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vs InterfaceS
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ip p.Number
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}
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func (s *numberS) SelectFrom(values ...interface{}) []float64 {
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numbers := []float64{}
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if s.vs != nil {
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values = s.vs.SelectFrom(values...)
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}
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for _, value := range values {
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i, ok := value.(float64)
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if !ok {
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continue
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}
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if s.ip != nil && !s.ip.Match(i) {
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continue
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}
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numbers = append(numbers, i)
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}
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return numbers
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}
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func (s *numberS) Filter(predicates ...p.Number) NumberS {
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if s.ip != nil {
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predicates = append(predicates, s.ip)
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}
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return &numberS{
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vs: s.vs,
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ip: p.NumberAnd(predicates...),
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}
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}
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func (s *numberS) Match(values interface{}) bool {
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return len(s.SelectFrom(values)) != 0
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}
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