mirror of https://github.com/status-im/op-geth.git
66 lines
1.8 KiB
Go
66 lines
1.8 KiB
Go
package toml
|
|
|
|
import (
|
|
"fmt"
|
|
"reflect"
|
|
"strings"
|
|
)
|
|
|
|
const fieldTagName = "toml"
|
|
|
|
// fieldCache maps normalized field names to their position in a struct.
|
|
type fieldCache struct {
|
|
named map[string]fieldInfo // fields with an explicit name in tag
|
|
auto map[string]fieldInfo // fields with auto-assigned normalized names
|
|
}
|
|
|
|
type fieldInfo struct {
|
|
index []int
|
|
name string
|
|
ignored bool
|
|
}
|
|
|
|
func makeFieldCache(cfg *Config, rt reflect.Type) fieldCache {
|
|
named, auto := make(map[string]fieldInfo), make(map[string]fieldInfo)
|
|
for i := 0; i < rt.NumField(); i++ {
|
|
ft := rt.Field(i)
|
|
// skip unexported fields
|
|
if ft.PkgPath != "" && !ft.Anonymous {
|
|
continue
|
|
}
|
|
col, _ := extractTag(ft.Tag.Get(fieldTagName))
|
|
info := fieldInfo{index: ft.Index, name: ft.Name, ignored: col == "-"}
|
|
if col == "" || col == "-" {
|
|
auto[cfg.NormFieldName(rt, ft.Name)] = info
|
|
} else {
|
|
named[col] = info
|
|
}
|
|
}
|
|
return fieldCache{named, auto}
|
|
}
|
|
|
|
func (fc fieldCache) findField(cfg *Config, rv reflect.Value, name string) (reflect.Value, string, error) {
|
|
info, found := fc.named[name]
|
|
if !found {
|
|
info, found = fc.auto[cfg.NormFieldName(rv.Type(), name)]
|
|
}
|
|
if !found {
|
|
if cfg.MissingField == nil {
|
|
return reflect.Value{}, "", fmt.Errorf("field corresponding to `%s' is not defined in %v", name, rv.Type())
|
|
} else {
|
|
return reflect.Value{}, "", cfg.MissingField(rv.Type(), name)
|
|
}
|
|
} else if info.ignored {
|
|
return reflect.Value{}, "", fmt.Errorf("field corresponding to `%s' in %v cannot be set through TOML", name, rv.Type())
|
|
}
|
|
return rv.FieldByIndex(info.index), info.name, nil
|
|
}
|
|
|
|
func extractTag(tag string) (col, rest string) {
|
|
tags := strings.SplitN(tag, ",", 2)
|
|
if len(tags) == 2 {
|
|
return strings.TrimSpace(tags[0]), strings.TrimSpace(tags[1])
|
|
}
|
|
return strings.TrimSpace(tags[0]), ""
|
|
}
|