82 lines
1.9 KiB
Go
82 lines
1.9 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 predicates
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// Slice is a "slice predicate". It's a type that decides if a
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// slice matches or not.
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type Slice interface {
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Match([]interface{}) bool
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}
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// SliceNot inverses the value of the predicate.
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func SliceNot(predicate Slice) Slice {
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return sliceNot{vp: predicate}
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}
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type sliceNot struct {
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vp Slice
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}
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func (p sliceNot) Match(slice []interface{}) bool {
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return !p.vp.Match(slice)
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}
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// SliceAnd returns true if all the sub-predicates are true. If there are
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// no sub-predicates, always returns true.
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func SliceAnd(predicates ...Slice) Slice {
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return sliceAnd{sps: predicates}
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}
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type sliceAnd struct {
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sps []Slice
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}
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func (p sliceAnd) Match(slice []interface{}) bool {
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for _, sp := range p.sps {
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if !sp.Match(slice) {
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return false
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}
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}
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return true
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}
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// SliceOr returns true if any sub-predicate is true. If there are no
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// sub-predicates, always returns false.
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func SliceOr(predicates ...Slice) Slice {
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sps := []Slice{}
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// Implements "De Morgan's law"
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for _, sp := range predicates {
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sps = append(sps, SliceNot(sp))
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}
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return SliceNot(SliceAnd(sps...))
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}
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// SliceLength matches if the length of the list matches the given
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// integer predicate.
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func SliceLength(ip Number) Slice {
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return sliceLength{ip: ip}
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}
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type sliceLength struct {
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ip Number
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}
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func (p sliceLength) Match(slice []interface{}) bool {
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return p.ip.Match(float64(len(slice)))
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}
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