use go 1.12

Signed-off-by: hongming <talonwan@yunify.com>

vendor/github.com/naoina/toml/util.go

@@ -0,0 +1,65 @@
+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]), ""
+}