36 lines
876 B
Go
36 lines
876 B
Go
package reflect2
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import "reflect"
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// TagIndex returns a map that associates tag values with field indices.
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func TagIndex(typ reflect.Type, tag string) map[string]int {
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tagIndex := map[string]int{}
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for i := 0; i < typ.NumField(); i++ {
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tag := typ.Field(i).Tag.Get(tag)
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if tag != "" {
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tagIndex[tag] = i
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}
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}
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return tagIndex
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}
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// AssociateColumns returns a map that associates column indices with fields.
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func AssociateColumns(typ reflect.Type, tag string, cols []string) map[int]int {
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tagIndex := TagIndex(typ, tag)
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colFields := map[int]int{}
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for i, col := range cols {
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if fi, ok := tagIndex[col]; ok {
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colFields[i] = fi
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}
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}
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return colFields
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}
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// Dereference keeps dereferencing pointers until a value is found.
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func Dereference(val reflect.Value) reflect.Value {
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for val.Kind() == reflect.Ptr && val.CanAddr() {
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val = val.Elem()
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}
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return val
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}
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