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tag.go
64 lines (54 loc) · 1.38 KB
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tag.go
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/*
Copyright 2020 Takahiro Yamashita
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 bit
import (
"encoding/binary"
"github.com/goccy/go-reflect"
"strings"
)
const (
tagKeyName = "bit"
)
// tagConfig represents StructTag.
// "-" : ignore the field
// "skip": ignore but offset will be updated
// "BE" : the field is treated as big endian
// "LE" : the field is treated as little endian
type tagConfig struct {
ignore bool
skip bool
endian binary.ByteOrder
}
func parseStructTag(t reflect.StructTag) *tagConfig {
s, ok := t.Lookup(tagKeyName)
if !ok {
return nil
}
ret := &tagConfig{}
strs := strings.Split(s, ",")
for _, v := range strs {
switch v {
case "-":
ret.ignore = true
return ret
case "skip":
ret.skip = true
return ret
case "BE":
ret.endian = binary.BigEndian
case "LE":
ret.endian = binary.LittleEndian
}
}
return ret
}