added float support and cleaner code

helper.go

@@ -0,0 +1,86 @@
+package filter
+
+import (
+	"errors"
+	"reflect"
+	"strconv"
+	"strings"
+)
+
+const (
+	any  = '*'
+	anys = string(any)
+)
+
+func getValue(v reflect.Value) (s string, b bool, err error) {
+	switch v.Kind() {
+	case reflect.Int, reflect.Int8, reflect.Int16,
+		reflect.Int32, reflect.Int64:
+		s = strconv.FormatInt(v.Int(), 10)
+	case reflect.Float32, reflect.Float64:
+		s = strconv.FormatFloat(v.Float(), 'f', -1, 64)
+	case reflect.String:
+		s = v.String()
+	case reflect.Bool:
+		b = v.Bool()
+	default:
+		err = errors.New("nil")
+	}
+	return
+}
+
+func matchFunc(v string) func(string) bool {
+	vl := len(v)
+	switch {
+	case vl >= 3:
+		if v[0] == any && v[vl-1] == any && v[1] != any && v[vl-2] != any {
+			return func(s string) bool {
+				return strings.Contains(s, v[1:vl-1])
+			}
+		}
+		fallthrough
+	case vl >= 2:
+		switch {
+		case v[0] == any && v[1] != any:
+			return func(s string) bool {
+				return strings.HasSuffix(s, v[1:])
+			}
+		case v[vl-1] == any && v[vl-2] != any:
+			return func(s string) bool {
+				return strings.HasPrefix(s, v[:vl-1])
+			}
+		}
+	}
+	v = strings.Replace(v, anys+anys, anys, -1)
+	return func(s string) bool {
+		if s == v {
+			return true
+		}
+		return false
+	}
+}
+func boolFunc(v string) func(bool) bool {
+	f := func(b bool) bool {
+		return false
+	}
+	if len(v) == 0 {
+		return f
+	}
+	if v[0] == 't' {
+		return func(b bool) bool {
+			if b {
+				return true
+			}
+			return false
+		}
+	}
+	if v[0] == 'f' {
+		return func(b bool) bool {
+			if !b {
+				return true
+			}
+			return false
+		}
+	}
+	return f
+}