func (x *Indexer) Visit(node ast.Node) ast.Visitor {
switch n := node.(type) {
case nil:
// nothing to do
case *ast.Ident:
x.visitIdent(Use, n)
case *ast.FieldList:
x.visitFieldList(VarDecl, n)
case *ast.InterfaceType:
x.visitFieldList(MethodDecl, n.Methods)
case *ast.DeclStmt:
// local declarations should only be *ast.GenDecls;
// ignore incorrect ASTs
if decl, ok := n.Decl.(*ast.GenDecl); ok {
x.decl = nil // no snippets for local declarations
x.visitGenDecl(decl)
}
case *ast.GenDecl:
x.decl = n
x.visitGenDecl(n)
case *ast.FuncDecl:
kind := FuncDecl
if n.Recv != nil {
kind = MethodDecl
ast.Walk(x, n.Recv)
}
x.decl = n
x.visitIdent(kind, n.Name)
ast.Walk(x, n.Type)
if n.Body != nil {
ast.Walk(x, n.Body)
}
case *ast.File:
x.decl = nil
x.visitIdent(PackageClause, n.Name)
for _, d := range n.Decls {
ast.Walk(x, d)
}
default:
return x
}
return nil
}
// idents is an iterator that returns all idents in f via the result channel.
func idents(f *ast.File) <-chan *ast.Ident {
v := make(visitor)
go func() {
ast.Walk(v, f)
close(v)
}()
return v
}
func (x *Indexer) visitFieldList(kind SpotKind, list *ast.FieldList) {
for _, f := range list.List {
x.decl = nil // no snippets for fields
for _, name := range f.Names {
x.visitIdent(kind, name)
}
ast.Walk(x, f.Type)
// ignore tag - not indexed at the moment
}
}
func (x *Indexer) visitSpec(kind SpotKind, spec ast.Spec) {
switch n := spec.(type) {
case *ast.ImportSpec:
x.visitIdent(ImportDecl, n.Name)
// ignore path - not indexed at the moment
case *ast.ValueSpec:
for _, n := range n.Names {
x.visitIdent(kind, n)
}
ast.Walk(x, n.Type)
for _, v := range n.Values {
ast.Walk(x, v)
}
case *ast.TypeSpec:
x.visitIdent(TypeDecl, n.Name)
ast.Walk(x, n.Type)
}
}
func (x *Indexer) visitFile(dirname string, f os.FileInfo, fulltextIndex bool) {
if f.IsDir() {
return
}
filename := pathpkg.Join(dirname, f.Name())
goFile := false
switch {
case isGoFile(f):
if !includeTestFiles && (!isPkgFile(f) || strings.HasPrefix(filename, "test/")) {
return
}
if !includeMainPackages && pkgName(filename) == "main" {
return
}
goFile = true
case !fulltextIndex || !isWhitelisted(f.Name()):
return
}
file, fast := x.addFile(filename, goFile)
if file == nil {
return // addFile failed
}
if fast != nil {
// we've got a Go file to index
x.current = file
pak := x.lookupPackage(dirname, fast.Name.Name)
x.file = &File{f.Name(), pak}
ast.Walk(x, fast)
}
// update statistics
x.stats.Bytes += file.Size()
x.stats.Files++
x.stats.Lines += file.LineCount()
}