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// SPDX-License-Identifier: GPL-3.0-or-later
package selector
import "fmt"
type Expr struct {
Allow []string `yaml:"allow" json:"allow"`
Deny []string `yaml:"deny" json:"deny"`
}
func (e Expr) Empty() bool {
return len(e.Allow) == 0 && len(e.Deny) == 0
}
func (e Expr) Parse() (Selector, error) {
if e.Empty() {
return nil, nil
}
var srs []Selector
var allow Selector
var deny Selector
for _, item := range e.Allow {
sr, err := Parse(item)
if err != nil {
return nil, fmt.Errorf("parse selector '%s': %v", item, err)
}
srs = append(srs, sr)
}
switch len(srs) {
case 0:
allow = trueSelector{}
case 1:
allow = srs[0]
default:
allow = Or(srs[0], srs[1], srs[2:]...)
}
srs = srs[:0]
for _, item := range e.Deny {
sr, err := Parse(item)
if err != nil {
return nil, fmt.Errorf("parse selector '%s': %v", item, err)
}
srs = append(srs, sr)
}
switch len(srs) {
case 0:
deny = falseSelector{}
case 1:
deny = srs[0]
default:
deny = Or(srs[0], srs[1], srs[2:]...)
}
return And(allow, Not(deny)), nil
}
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