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https://github.com/golang/go
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d46b792624
This is a common source of bugs, particularly for those new to Go. Running this on a corpus of public code flagged 114 instances. This check may need to be updated once issue 7363 is resolved. LGTM=r R=golang-codereviews, r CC=bradfitz, golang-codereviews https://golang.org/cl/91010047
63 lines
1.5 KiB
Go
63 lines
1.5 KiB
Go
// Copyright 2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// This file contains the test for canonical struct tags.
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package main
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import (
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"go/ast"
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"reflect"
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"strconv"
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)
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func init() {
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register("structtags",
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"check that struct field tags have canonical format and apply to exported fields as needed",
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checkCanonicalFieldTag,
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field)
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}
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// checkCanonicalFieldTag checks a struct field tag.
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func checkCanonicalFieldTag(f *File, node ast.Node) {
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field := node.(*ast.Field)
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if field.Tag == nil {
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return
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}
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tag, err := strconv.Unquote(field.Tag.Value)
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if err != nil {
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f.Badf(field.Pos(), "unable to read struct tag %s", field.Tag.Value)
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return
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}
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// Check tag for validity by appending
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// new key:value to end and checking that
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// the tag parsing code can find it.
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st := reflect.StructTag(tag + ` _gofix:"_magic"`)
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if st.Get("_gofix") != "_magic" {
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f.Badf(field.Pos(), "struct field tag %s not compatible with reflect.StructTag.Get", field.Tag.Value)
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return
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}
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// Check for use of json or xml tags with unexported fields.
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// Embedded struct. Nothing to do for now, but that
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// may change, depending on what happens with issue 7363.
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if len(field.Names) == 0 {
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return
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}
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if field.Names[0].IsExported() {
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return
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}
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for _, enc := range [...]string{"json", "xml"} {
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if st.Get(enc) != "" {
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f.Badf(field.Pos(), "struct field %s has %s tag but is not exported", field.Names[0].Name, enc)
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return
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}
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}
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}
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