92 lines
1.9 KiB
Go
92 lines
1.9 KiB
Go
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//This package is copied from Go library reflect/type.go.
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//The struct tag library provides no way to extract the list of struct tags, only
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//a specific tag
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package reflect
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import (
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"fmt"
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"strconv"
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"strings"
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)
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type StructTag struct {
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Name string
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Value string
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}
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func (t StructTag) String() string {
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return fmt.Sprintf("%s:%q", t.Name, t.Value)
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}
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type StructTags []StructTag
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func (tags StructTags) String() string {
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s := make([]string, 0, len(tags))
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for _, tag := range tags {
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s = append(s, tag.String())
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}
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return "`" + strings.Join(s, " ") + "`"
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}
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func (tags StructTags) Has(name string) bool {
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for i := range tags {
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if tags[i].Name == name {
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return true
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}
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}
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return false
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}
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// ParseStructTags returns the full set of fields in a struct tag in the order they appear in
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// the struct tag.
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func ParseStructTags(tag string) (StructTags, error) {
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tags := StructTags{}
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for tag != "" {
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// Skip leading space.
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i := 0
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for i < len(tag) && tag[i] == ' ' {
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i++
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}
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tag = tag[i:]
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if tag == "" {
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break
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}
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// Scan to colon. A space, a quote or a control character is a syntax error.
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// Strictly speaking, control chars include the range [0x7f, 0x9f], not just
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// [0x00, 0x1f], but in practice, we ignore the multi-byte control characters
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// as it is simpler to inspect the tag's bytes than the tag's runes.
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i = 0
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for i < len(tag) && tag[i] > ' ' && tag[i] != ':' && tag[i] != '"' && tag[i] != 0x7f {
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i++
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}
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if i == 0 || i+1 >= len(tag) || tag[i] != ':' || tag[i+1] != '"' {
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break
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}
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name := string(tag[:i])
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tag = tag[i+1:]
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// Scan quoted string to find value.
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i = 1
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for i < len(tag) && tag[i] != '"' {
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if tag[i] == '\\' {
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i++
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}
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i++
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}
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if i >= len(tag) {
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break
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}
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qvalue := string(tag[:i+1])
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tag = tag[i+1:]
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value, err := strconv.Unquote(qvalue)
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if err != nil {
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return nil, err
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}
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tags = append(tags, StructTag{Name: name, Value: value})
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}
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return tags, nil
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}
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