1 files changed, 62 insertions, 0 deletions
diff --git a/src/go/collectors/go.d.plugin/pkg/matcher/expr.go b/src/go/collectors/go.d.plugin/pkg/matcher/expr.go
new file mode 100644
index 000000000..f9155f761
--- /dev/null
+++ b/src/go/collectors/go.d.plugin/pkg/matcher/expr.go
@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package matcher
+
+import (
+	"errors"
+	"fmt"
+)
+
+type (
+	Expr interface {
+		Parse() (Matcher, error)
+	}
+
+	// SimpleExpr is a simple expression to describe the condition:
+	//     (includes[0].Match(v) || includes[1].Match(v) || ...) && !(excludes[0].Match(v) || excludes[1].Match(v) || ...)
+	SimpleExpr struct {
+		Includes []string `yaml:"includes" json:"includes"`
+		Excludes []string `yaml:"excludes" json:"excludes"`
+	}
+)
+
+var (
+	ErrEmptyExpr = errors.New("empty expression")
+)
+
+// Empty returns true if both Includes and Excludes are empty. You can't
+func (s *SimpleExpr) Empty() bool {
+	return len(s.Includes) == 0 && len(s.Excludes) == 0
+}
+
+// Parse parses the given matchers in Includes and Excludes
+func (s *SimpleExpr) Parse() (Matcher, error) {
+	if len(s.Includes) == 0 && len(s.Excludes) == 0 {
+		return nil, ErrEmptyExpr
+	}
+	var (
+		includes = FALSE()
+		excludes = FALSE()
+	)
+	if len(s.Includes) > 0 {
+		for _, item := range s.Includes {
+			m, err := Parse(item)
+			if err != nil {
+				return nil, fmt.Errorf("parse matcher %q error: %v", item, err)
+			}
+			includes = Or(includes, m)
+		}
+	} else {
+		includes = TRUE()
+	}
+
+	for _, item := range s.Excludes {
+		m, err := Parse(item)
+		if err != nil {
+			return nil, fmt.Errorf("parse matcher %q error: %v", item, err)
+		}
+		excludes = Or(excludes, m)
+	}
+
+	return And(includes, Not(excludes)), nil
+}