Adding upstream version 2.5.1.

Signed-off-by: Daniel Baumann <daniel@debian.org>

util/extract.go

@@ -0,0 +1,66 @@
+//  Copyright (c) 2023 Couchbase, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 		http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package util
+
+import (
+	"math"
+	"reflect"
+)
+
+// extract numeric value (if possible) and returns a float64
+func ExtractNumericValFloat64(v interface{}) (float64, bool) {
+	val := reflect.ValueOf(v)
+	if !val.IsValid() {
+		return 0, false
+	}
+
+	switch {
+	case val.CanFloat():
+		return val.Float(), true
+	case val.CanInt():
+		return float64(val.Int()), true
+	case val.CanUint():
+		return float64(val.Uint()), true
+	}
+
+	return 0, false
+}
+
+// extract numeric value (if possible) and returns a float32
+func ExtractNumericValFloat32(v interface{}) (float32, bool) {
+	val := reflect.ValueOf(v)
+	if !val.IsValid() {
+		return 0, false
+	}
+
+	switch {
+	case val.CanFloat():
+		floatVal := val.Float()
+		if !IsValidFloat32(floatVal) {
+			return 0, false
+		}
+		return float32(floatVal), true
+	case val.CanInt():
+		return float32(val.Int()), true
+	case val.CanUint():
+		return float32(val.Uint()), true
+	}
+
+	return 0, false
+}
+
+func IsValidFloat32(val float64) bool {
+	return !math.IsNaN(val) && !math.IsInf(val, 0) && val <= math.MaxFloat32
+}