internal: factor out FileComment code
Change-Id: I8480431e1c4e2314af91ec775a72cb817e6bf4a5
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/5743
Reviewed-by: Marcel van Lohuizen <mpvl@golang.org>
diff --git a/cue/instance.go b/cue/instance.go
index d26b496..5cf2e9f 100644
--- a/cue/instance.go
+++ b/cue/instance.go
@@ -170,32 +170,8 @@
return nil
}
for _, f := range inst.inst.Files {
- pkg, _, _ := internal.PackageInfo(f)
- var cgs []*ast.CommentGroup
- if pkg != nil {
- cgs = pkg.Comments()
- } else if cgs = f.Comments(); len(cgs) > 0 {
- // Use file comment.
- } else {
- // Use first comment declaration before any package or import.
- for _, d := range f.Decls {
- switch x := d.(type) {
- case *ast.Attribute:
- continue
- case *ast.CommentGroup:
- cgs = append(cgs, x)
- }
- break
- }
- }
- var cg *ast.CommentGroup
- for _, c := range cgs {
- if c.Position == 0 {
- cg = c
- }
- }
- if cg != nil {
- docs = append(docs, cg)
+ if c := internal.FileComment(f); c != nil {
+ docs = append(docs, c)
}
}
return docs
diff --git a/internal/internal.go b/internal/internal.go
index 06545b9..58b69ee 100644
--- a/internal/internal.go
+++ b/internal/internal.go
@@ -154,6 +154,36 @@
return cg
}
+func FileComment(f *ast.File) *ast.CommentGroup {
+ pkg, _, _ := PackageInfo(f)
+ var cgs []*ast.CommentGroup
+ if pkg != nil {
+ cgs = pkg.Comments()
+ } else if cgs = f.Comments(); len(cgs) > 0 {
+ // Use file comment.
+ } else {
+ // Use first comment before any declaration.
+ for _, d := range f.Decls {
+ if cg, ok := d.(*ast.CommentGroup); ok {
+ return cg
+ }
+ if cgs = ast.Comments(d); cgs != nil {
+ break
+ }
+ if _, ok := d.(*ast.Attribute); !ok {
+ break
+ }
+ }
+ }
+ var cg *ast.CommentGroup
+ for _, c := range cgs {
+ if c.Position == 0 {
+ cg = c
+ }
+ }
+ return cg
+}
+
func NewAttr(name, str string) *ast.Attribute {
buf := &strings.Builder{}
buf.WriteByte('@')
