72 lines
1.3 KiB
Go
72 lines
1.3 KiB
Go
package hcl
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import (
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"errors"
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"fmt"
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"reflect"
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"strings"
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)
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const (
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ElementTypeAttribute ElementType = "attr"
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ElementTypeBlock ElementType = "block"
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ElementTypeLabel ElementType = "label"
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ElementTypeRemain ElementType = "remain"
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)
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var ErrNoHclTag = errors.New("no hcl tag")
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type ElementType string
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type FieldMeta struct {
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Name string
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Type ElementType
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Optional bool
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Ignore bool
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}
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func ExtractFieldMeta(t reflect.StructField, readTagName, writeTagName string) (FieldMeta, error) {
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hclTag, present := t.Tag.Lookup(readTagName)
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if !present {
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return FieldMeta{}, ErrNoHclTag
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}
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cfg := FieldMeta{
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Name: t.Name,
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Type: ElementTypeAttribute,
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}
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if hclWriteTag, present := t.Tag.Lookup(writeTagName); present && hclWriteTag == "-" {
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cfg.Ignore = true
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return cfg, nil
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}
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split := strings.Split(hclTag, ",")
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if len(split) > 0 && split[0] != "" {
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cfg.Name = split[0]
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}
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if len(split) > 1 {
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switch split[1] {
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case "":
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fallthrough
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case "attr":
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cfg.Type = ElementTypeAttribute
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case "optional":
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cfg.Optional = true
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case "label":
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cfg.Type = ElementTypeLabel
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case "block":
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cfg.Type = ElementTypeBlock
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case "remain":
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cfg.Type = ElementTypeRemain
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default:
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return FieldMeta{}, fmt.Errorf("unknown element type %q", split[1])
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}
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}
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return cfg, nil
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}
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