59 lines
1.3 KiB
Go
59 lines
1.3 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Copyright 2019 Dominik Honnef. All rights reserved.
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package staticcheck
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import "strconv"
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func parseStructTag(tag string) (map[string][]string, error) {
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// FIXME(dh): detect missing closing quote
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out := map[string][]string{}
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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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out[name] = append(out[name], value)
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}
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return out, nil
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}
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