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exported: improve detection and error message (#1403)

This commit is contained in:
ccoVeille
2025-07-22 10:47:37 +02:00
committed by GitHub
parent 7de7cf3076
commit 40a690dff5
3 changed files with 166 additions and 34 deletions

View File

@@ -165,21 +165,36 @@ func (w *lintExported) lintFuncDoc(fn *ast.FuncDecl) {
return
}
firstCommentLine := firstCommentLine(fn.Doc)
if firstCommentLine == "" {
w.addFailuref(fn, 1, lint.FailureCategoryComments,
status := w.checkGoDocStatus(fn.Doc, fn.Name.Name)
switch status {
case exportedGoDocStatusOK:
return // comment is fine
case exportedGoDocStatusMissing:
w.addFailuref(fn, status.Confidence(), lint.FailureCategoryComments,
"exported %s %s should have comment or be unexported", kind, name,
)
return
}
prefix := fn.Name.Name + " "
if !strings.HasPrefix(firstCommentLine, prefix) {
w.addFailuref(fn.Doc, 0.8, lint.FailureCategoryComments,
`comment on exported %s %s should be of the form "%s..."`, kind, name, prefix,
)
firstCommentLine := w.firstCommentLine(fn.Doc)
w.addFailuref(fn.Doc, status.Confidence(), lint.FailureCategoryComments,
`comment on exported %s %s should be of the form "%s ..."%s`, kind, name, fn.Name.Name, status.CorrectionHint(firstCommentLine),
)
}
func (*lintExported) hasPrefixInsensitive(s, prefix string) bool {
return strings.HasPrefix(strings.ToLower(s), strings.ToLower(prefix))
}
func (*lintExported) stripFirstRune(s string) string {
// Decode the first rune to handle multi-byte characters.
firstRune, size := utf8.DecodeRuneInString(s)
if firstRune == utf8.RuneError {
return s // no valid first rune found
}
// Return the string without the first rune.
return s[size:]
}
func (w *lintExported) checkRepetitiveNames(id *ast.Ident, thing string) {
@@ -233,24 +248,24 @@ func (w *lintExported) lintTypeDoc(t *ast.TypeSpec, doc *ast.CommentGroup, first
return
}
expectedPrefix := typeName
for _, a := range articles {
if typeName == a {
continue
}
var found bool
if firstCommentLine, found = strings.CutPrefix(firstCommentLine, a+" "); found {
expectedPrefix = a + " " + typeName
break
}
}
// if comment starts with name of type and has some text after - it's ok
expectedPrefix := typeName + " "
if strings.HasPrefix(firstCommentLine, expectedPrefix) {
status := w.checkGoDocStatus(doc, expectedPrefix)
if status == exportedGoDocStatusOK {
return
}
w.addFailuref(doc, 1, lint.FailureCategoryComments,
`comment on exported type %v should be of the form "%s..." (with optional leading article)`, t.Name, expectedPrefix,
w.addFailuref(doc, status.Confidence(), lint.FailureCategoryComments,
`comment on exported type %v should be of the form "%s ..." (with optional leading article)%s`, t.Name, typeName, status.CorrectionHint(firstCommentLine),
)
}
@@ -272,6 +287,7 @@ func (w *lintExported) checkValueNames(names []*ast.Ident, nodeToBlame ast.Node,
return true
}
func (w *lintExported) lintValueSpecDoc(vs *ast.ValueSpec, gd *ast.GenDecl, genDeclMissingComments map[*ast.GenDecl]bool) {
kind := "var"
if gd.Tok == token.CONST {
@@ -292,8 +308,8 @@ func (w *lintExported) lintValueSpecDoc(vs *ast.ValueSpec, gd *ast.GenDecl, genD
return
}
vsFirstCommentLine := firstCommentLine(vs.Doc)
gdFirstCommentLine := firstCommentLine(gd.Doc)
vsFirstCommentLine := w.firstCommentLine(vs.Doc)
gdFirstCommentLine := w.firstCommentLine(gd.Doc)
if vsFirstCommentLine == "" && gdFirstCommentLine == "" {
if genDeclMissingComments[gd] {
return
@@ -325,20 +341,77 @@ func (w *lintExported) lintValueSpecDoc(vs *ast.ValueSpec, gd *ast.GenDecl, genD
default:
doc = gd.Doc
}
firstCommentLine := w.firstCommentLine(doc)
prefix := name + " "
if !strings.HasPrefix(firstCommentLine(doc), prefix) {
w.addFailuref(doc, 1, lint.FailureCategoryComments,
`comment on exported %s %s should be of the form "%s..."`, kind, name, prefix,
)
status := w.checkGoDocStatus(doc, name)
if status == exportedGoDocStatusOK {
return
}
w.addFailuref(doc, status.Confidence(), lint.FailureCategoryComments,
`comment on exported %s %s should be of the form "%s ..."%s`, kind, name, name, status.CorrectionHint(firstCommentLine),
)
}
type exportedGoDocStatus int
const (
exportedGoDocStatusOK exportedGoDocStatus = iota
exportedGoDocStatusMissing
exportedGoDocStatusCaseMismatch
exportedGoDocStatusFirstLetterMismatch
exportedGoDocStatusUnexpected
)
func (gds exportedGoDocStatus) Confidence() float64 {
if gds == exportedGoDocStatusUnexpected {
return 0.8
}
return 1
}
func (gds exportedGoDocStatus) CorrectionHint(firstCommentLine string) string {
firstWord := strings.Split(firstCommentLine, " ")[0]
switch gds {
case exportedGoDocStatusCaseMismatch:
return ` by using its correct casing, not "` + firstWord + ` ..."`
case exportedGoDocStatusFirstLetterMismatch:
return ` to match its exported status, not "` + firstWord + ` ..."`
}
return ""
}
func (w *lintExported) checkGoDocStatus(comment *ast.CommentGroup, name string) exportedGoDocStatus {
firstCommentLine := w.firstCommentLine(comment)
if firstCommentLine == "" {
return exportedGoDocStatusMissing
}
name = strings.TrimSpace(name)
// Make sure the expected prefix has a space at the end.
expectedPrefix := name + " "
if strings.HasPrefix(firstCommentLine, expectedPrefix) {
return exportedGoDocStatusOK
}
if !w.hasPrefixInsensitive(firstCommentLine, expectedPrefix) {
return exportedGoDocStatusUnexpected
}
if strings.HasPrefix(w.stripFirstRune(firstCommentLine), w.stripFirstRune(expectedPrefix)) {
// Only the first character differs, such as "sendJSON" became "SendJSON".
// so we consider the scope has changed.
return exportedGoDocStatusFirstLetterMismatch
}
return exportedGoDocStatusCaseMismatch
}
// firstCommentLine yields the first line of interest in comment group or "" if there is nothing of interest.
// An "interesting line" is a comment line that is neither a directive (e.g. //go:...) or a deprecation comment
// (lines from the first line with a prefix // Deprecated: to the end of the comment group)
// Empty or spaces-only lines are discarded.
func firstCommentLine(comment *ast.CommentGroup) (result string) {
func (lintExported) firstCommentLine(comment *ast.CommentGroup) (result string) {
if comment == nil {
return ""
}
@@ -384,10 +457,10 @@ func (w *lintExported) Visit(n ast.Node) ast.Visitor {
// inside a GenDecl, which usually has the doc
doc := v.Doc
fcl := firstCommentLine(doc)
fcl := w.firstCommentLine(doc)
if fcl == "" {
doc = w.lastGenDecl.Doc
fcl = firstCommentLine(doc)
fcl = w.firstCommentLine(doc)
}
w.lintTypeDoc(v, doc, fcl)
w.checkRepetitiveNames(v.Name, "type")
@@ -421,21 +494,23 @@ func (w *lintExported) lintInterfaceMethod(typeName string, m *ast.Field) {
if !ast.IsExported(m.Names[0].Name) {
return
}
name := m.Names[0].Name
firstCommentLine := firstCommentLine(m.Doc)
if firstCommentLine == "" {
w.addFailuref(m, 1, lint.FailureCategoryComments,
status := w.checkGoDocStatus(m.Doc, name)
switch status {
case exportedGoDocStatusOK:
return // comment is fine
case exportedGoDocStatusMissing:
w.addFailuref(m, status.Confidence(), lint.FailureCategoryComments,
"public interface method %s.%s should be commented", typeName, name,
)
return
}
expectedPrefix := m.Names[0].Name + " "
if !strings.HasPrefix(firstCommentLine, expectedPrefix) {
w.addFailuref(m.Doc, 0.8, lint.FailureCategoryComments,
`comment on exported interface method %s.%s should be of the form "%s..."`, typeName, name, expectedPrefix,
)
}
firstCommentLine := w.firstCommentLine(m.Doc)
w.addFailuref(m.Doc, status.Confidence(), lint.FailureCategoryComments,
`comment on exported interface method %s.%s should be of the form "%s ..."%s`, typeName, name, name, status.CorrectionHint(firstCommentLine),
)
}
// mustCheckMethod returns true if the method must be checked by this rule, false otherwise.

View File

@@ -51,3 +51,7 @@ func TestCheckDeprecationComment(t *testing.T) {
func TestExportedMainPackage(t *testing.T) {
testRule(t, "exported_main", &rule.ExportedRule{}, &lint.RuleConfig{})
}
func TestCommentVariations(t *testing.T) {
testRule(t, "exported_issue_1235", &rule.ExportedRule{}, &lint.RuleConfig{})
}

53
testdata/exported_issue_1235.go vendored Normal file
View File

@@ -0,0 +1,53 @@
package golint
import (
"errors"
)
// SendJson sends a JSON object to the server.
func SendJSON(data interface{}) error {
return nil
}
// ErrInvalidJson is returned when the JSON is invalid.
var ErrInvalidJSON = errors.New("invalid JSON")
// StatusHTTP represents an HTTP status code.
type StatusHTTP int
// Foobar blah blah
func (s StatusHTTP) FooBar() int {
return int(s)
}
// qux was previously unexported, but now it is exported.
func (s StatusHTTP) Qux() int {
return int(s)
}
// SendJson sends a JSON object to the server.
func SendJSON(data interface{}) error {
return nil
}
// errNotFound is returned when the requested resource is not found.
var ErrNotFound = errors.New("not found")
// scope changed
// MATCH:23 /comment on exported method StatusHTTP.Qux should be of the form "Qux ..." to match its exported status, not "qux ..."/
// MATCH:33 /comment on exported var ErrNotFound should be of the form "ErrNotFound ..." to match its exported status, not "errNotFound ..."/
// case change
// MATCH:7 /comment on exported function SendJSON should be of the form "SendJSON ..." by using its correct casing, not "SendJson ..."/
// MATCH:12 /comment on exported var ErrInvalidJSON should be of the form "ErrInvalidJSON ..." by using its correct casing, not "ErrInvalidJson ..."/
// MATCH:18 /comment on exported method StatusHTTP.FooBar should be of the form "FooBar ..." by using its correct casing, not "Foobar ..."/
// MATCH:28 /comment on exported function SendJSON should be of the form "SendJSON ..." by using its correct casing, not "SendJson ..."/
// VeryLongCommentThatCouldBeCJKThatCannotBeSplitOnSpaces is about the function F.
func F() string {
return "F"
}
// This one is a safeguard against future changes in the way the error is reported.
// Here we should never suggest something that would include VeryLongCommentThatCouldBeCJKThatCannotBeSplitOnSpaces in the error message.
// MATCH:46 /comment on exported function F should be of the form "F ..."/