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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]), ""
}
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