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