github.com/xushiwei/go@v0.0.0-20130601165731-2b9d83f45bc9/src/cmd/vet/structtag.go (about) 1 // Copyright 2010 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 // This file contains the test for canonical struct tags. 6 7 package main 8 9 import ( 10 "go/ast" 11 "reflect" 12 "strconv" 13 ) 14 15 // checkField checks a struct field tag. 16 func (f *File) checkCanonicalFieldTag(field *ast.Field) { 17 if !vet("structtags") { 18 return 19 } 20 if field.Tag == nil { 21 return 22 } 23 24 tag, err := strconv.Unquote(field.Tag.Value) 25 if err != nil { 26 f.Badf(field.Pos(), "unable to read struct tag %s", field.Tag.Value) 27 return 28 } 29 30 // Check tag for validity by appending 31 // new key:value to end and checking that 32 // the tag parsing code can find it. 33 if reflect.StructTag(tag+` _gofix:"_magic"`).Get("_gofix") != "_magic" { 34 f.Badf(field.Pos(), "struct field tag %s not compatible with reflect.StructTag.Get", field.Tag.Value) 35 return 36 } 37 }