| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | package matcher |
| 4 | |
| 5 | import ( |
| 6 | "errors" |
| 7 | "fmt" |
| 8 | ) |
| 9 | |
| 10 | type ( |
| 11 | Expr interface { |
| 12 | Parse() (Matcher, error) |
| 13 | } |
| 14 | |
| 15 | // SimpleExpr is a simple expression to describe the condition: |
| 16 | // (includes[0].Match(v) || includes[1].Match(v) || ...) && !(excludes[0].Match(v) || excludes[1].Match(v) || ...) |
| 17 | SimpleExpr struct { |
| 18 | Includes []string `yaml:"includes,omitempty" json:"includes"` |
| 19 | Excludes []string `yaml:"excludes,omitempty" json:"excludes"` |
| 20 | } |
| 21 | ) |
| 22 | |
| 23 | var ( |
| 24 | ErrEmptyExpr = errors.New("empty expression") |
| 25 | ) |
| 26 | |
| 27 | // Empty returns true if both Includes and Excludes are empty. You can't |
| 28 | func (s *SimpleExpr) Empty() bool { |
| 29 | return len(s.Includes) == 0 && len(s.Excludes) == 0 |
| 30 | } |
| 31 | |
| 32 | // Parse parses the given matchers in Includes and Excludes |
| 33 | func (s *SimpleExpr) Parse() (Matcher, error) { |
| 34 | if len(s.Includes) == 0 && len(s.Excludes) == 0 { |
| 35 | return nil, ErrEmptyExpr |
| 36 | } |
| 37 | var ( |
| 38 | includes = FALSE() |
| 39 | excludes = FALSE() |
| 40 | ) |
| 41 | if len(s.Includes) > 0 { |
| 42 | for _, item := range s.Includes { |
| 43 | m, err := Parse(item) |
| 44 | if err != nil { |
| 45 | return nil, fmt.Errorf("parse matcher %q error: %v", item, err) |
| 46 | } |
| 47 | includes = Or(includes, m) |
| 48 | } |
| 49 | } else { |
| 50 | includes = TRUE() |
| 51 | } |
| 52 | |
| 53 | for _, item := range s.Excludes { |
| 54 | m, err := Parse(item) |
| 55 | if err != nil { |
| 56 | return nil, fmt.Errorf("parse matcher %q error: %v", item, err) |
| 57 | } |
| 58 | excludes = Or(excludes, m) |
| 59 | } |
| 60 | |
| 61 | return And(includes, Not(excludes)), nil |
| 62 | } |