// growSpan expands the span for the object to contain the instance represented
// by the identifier.
func (pkg *Package) growSpan(ident *ast.Ident, obj types.Object) {
if *strictShadowing {
return // No need
}
pos := ident.Pos()
end := ident.End()
span, ok := pkg.spans[obj]
if ok {
if span.min > pos {
span.min = pos
}
if span.max < end {
span.max = end
}
} else {
span = Span{pos, end}
}
pkg.spans[obj] = span
}
func completeCalltip(src []byte, fn string, offset int) []gocode.GoSublimeGocodeCandidate {
fset := token.NewFileSet()
af, _ := parser.ParseFile(fset, fn, src, 0)
if af != nil {
vis := &calltipVisitor{
offset: offset,
fset: fset,
}
ast.Walk(vis, af)
if vis.x != nil {
var id *ast.Ident
switch v := vis.x.Fun.(type) {
case *ast.Ident:
id = v
case *ast.SelectorExpr:
id = v.Sel
}
if id != nil && id.End().IsValid() {
line := offsetLine(fset, af, offset)
cp := fset.Position(id.End())
cr := cp.Offset
cl := gocode.GoSublimeGocodeComplete(src, fn, cr)
if (cp.Line == line || line == 0) && len(cl) > 0 {
for i, c := range cl {
if strings.EqualFold(id.Name, c.Name) {
return cl[i : i+1]
}
}
}
}
}
}
return []gocode.GoSublimeGocodeCandidate{}
}
// Returns true if unused
func checkObj(expr *ast.Ident, object types.Object, prog *loader.Program, ssaprog *ssa.Program, fset *token.FileSet) (unused bool) {
if _, ok := object.(*types.Var); !ok {
if debug {
fmt.Println("Skipping object", object)
}
return false
}
pkg, node, _ := prog.PathEnclosingInterval(expr.Pos(), expr.End())
spkg := ssaprog.Package(pkg.Pkg)
f := ssa.EnclosingFunction(spkg, node)
if f == nil {
if debug {
fmt.Printf("Unknown function %v %v %v %v\n", fset.Position(expr.Pos()), object, pkg, prog)
}
return false
}
value, _ := f.ValueForExpr(expr)
// Unwrap unops and grab the value inside
if v, ok := value.(*ssa.UnOp); ok {
if debug {
fmt.Println("Unwrapping unop")
}
value = v.X
}
if debug {
fmt.Printf("%v %v: %v %#v\n", fset.Position(expr.Pos()), expr, object, value)
}
if _, ok := value.(*ssa.Global); ok {
if debug {
fmt.Printf(" is global\n")
}
return false
}
if value == nil {
if debug {
fmt.Println("Value is nil", object)
}
return false
}
refs := value.Referrers()
if refs == nil {
if debug {
fmt.Println("Referrers is nil", object)
}
return false
}
if debug {
fmt.Printf(" (refs) %v\n", refs)
}
hasRef := false
for _, r := range *refs {
_, ok := r.(*ssa.DebugRef)
hasRef = hasRef || !ok
if debug && !ok {
fmt.Printf("%v %v: %v %v\n", fset.Position(expr.Pos()), expr, object, r)
}
}
if !hasRef {
unused = true
}
return unused
}
// NewDef creates a new Def.
func (g *Grapher) NewDef(obj types.Object, declIdent *ast.Ident) (*Def, error) {
// Find the AST node that declares this def.
var declNode ast.Node
_, astPath, _ := g.program.PathEnclosingInterval(declIdent.Pos(), declIdent.End())
for _, node := range astPath {
switch node.(type) {
case *ast.FuncDecl, *ast.GenDecl, *ast.ValueSpec, *ast.TypeSpec, *ast.Field, *ast.DeclStmt, *ast.AssignStmt:
declNode = node
goto found
}
}
found:
if declNode == nil {
return nil, fmt.Errorf("On ident %s at %s: no DeclNode found (using PathEnclosingInterval)", declIdent.Name, g.program.Fset.Position(declIdent.Pos()))
}
key, info, err := g.defInfo(obj)
if err != nil {
return nil, err
}
si := definfo.DefInfo{
Exported: info.exported,
PkgScope: info.pkgscope,
PkgName: obj.Pkg().Name(),
Kind: defKind(obj),
}
if typ := obj.Type(); typ != nil {
si.TypeString = typ.String()
if utyp := typ.Underlying(); utyp != nil {
si.UnderlyingTypeString = utyp.String()
}
}
switch obj := obj.(type) {
case *types.Var:
if obj.IsField() {
if fieldStruct, ok := g.structFields[obj]; ok {
if struct_, ok := fieldStruct.parent.(*types.Named); ok {
si.FieldOfStruct = struct_.Obj().Name()
}
}
}
case *types.Func:
sig := obj.Type().(*types.Signature)
if recv := sig.Recv(); recv != nil && recv.Type() != nil {
// omit package path; just get receiver type name
si.Receiver = strings.Replace(recv.Type().String(), obj.Pkg().Path()+".", "", 1)
}
}
return &Def{
Name: obj.Name(),
DefKey: key,
File: g.program.Fset.Position(declIdent.Pos()).Filename,
IdentSpan: makeSpan(g.program.Fset, declIdent),
DeclSpan: makeSpan(g.program.Fset, declNode),
DefInfo: si,
}, nil
}