| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | package selectorcore |
| 4 | |
| 5 | type ( |
| 6 | trueSelector struct{} |
| 7 | falseSelector struct{} |
| 8 | negSelector struct{ s Selector } |
| 9 | andSelector struct{ lhs, rhs Selector } |
| 10 | orSelector struct{ lhs, rhs Selector } |
| 11 | ) |
| 12 | |
| 13 | func (trueSelector) Matches(_ string, _ Labels) bool { return true } |
| 14 | func (falseSelector) Matches(_ string, _ Labels) bool { return false } |
| 15 | |
| 16 | func (s negSelector) Matches(metricName string, labels Labels) bool { |
| 17 | return !s.s.Matches(metricName, labels) |
| 18 | } |
| 19 | |
| 20 | func (s andSelector) Matches(metricName string, labels Labels) bool { |
| 21 | return s.lhs.Matches(metricName, labels) && s.rhs.Matches(metricName, labels) |
| 22 | } |
| 23 | |
| 24 | func (s orSelector) Matches(metricName string, labels Labels) bool { |
| 25 | return s.lhs.Matches(metricName, labels) || s.rhs.Matches(metricName, labels) |
| 26 | } |
| 27 | |
| 28 | // True returns a selector which always matches. |
| 29 | func True() Selector { |
| 30 | return trueSelector{} |
| 31 | } |
| 32 | |
| 33 | // And returns a selector that matches only when all sub-selectors match. |
| 34 | func And(lhs, rhs Selector, others ...Selector) Selector { |
| 35 | s := andSelector{lhs: lhs, rhs: rhs} |
| 36 | if len(others) == 0 { |
| 37 | return s |
| 38 | } |
| 39 | return And(s, others[0], others[1:]...) |
| 40 | } |
| 41 | |
| 42 | // Or returns a selector that matches when any sub-selector matches. |
| 43 | func Or(lhs, rhs Selector, others ...Selector) Selector { |
| 44 | s := orSelector{lhs: lhs, rhs: rhs} |
| 45 | if len(others) == 0 { |
| 46 | return s |
| 47 | } |
| 48 | return Or(s, others[0], others[1:]...) |
| 49 | } |
| 50 | |
| 51 | // Not returns a selector that negates the wrapped selector. |
| 52 | func Not(s Selector) Selector { |
| 53 | return negSelector{s: s} |
| 54 | } |