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// SPDX-License-Identifier: GPL-3.0-or-later
package selector
import (
"github.com/prometheus/prometheus/model/labels"
)
type (
trueSelector struct{}
falseSelector struct{}
negSelector struct{ s Selector }
andSelector struct{ lhs, rhs Selector }
orSelector struct{ lhs, rhs Selector }
)
func (trueSelector) Matches(_ labels.Labels) bool { return true }
func (falseSelector) Matches(_ labels.Labels) bool { return false }
func (s negSelector) Matches(lbs labels.Labels) bool { return !s.s.Matches(lbs) }
func (s andSelector) Matches(lbs labels.Labels) bool { return s.lhs.Matches(lbs) && s.rhs.Matches(lbs) }
func (s orSelector) Matches(lbs labels.Labels) bool { return s.lhs.Matches(lbs) || s.rhs.Matches(lbs) }
// True returns a selector which always returns true
func True() Selector {
return trueSelector{}
}
// And returns a selector which returns true only if all of it's sub-selectors return true
func And(lhs, rhs Selector, others ...Selector) Selector {
s := andSelector{lhs: lhs, rhs: rhs}
if len(others) == 0 {
return s
}
return And(s, others[0], others[1:]...)
}
// Or returns a selector which returns true if any of it's sub-selectors return true
func Or(lhs, rhs Selector, others ...Selector) Selector {
s := orSelector{lhs: lhs, rhs: rhs}
if len(others) == 0 {
return s
}
return Or(s, others[0], others[1:]...)
}
// Not returns a selector which returns the negation of the sub-selector's result
func Not(s Selector) Selector {
return negSelector{s}
}
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