func Rename(filename string, line int, column int, newName string) (ok bool, err *errors.GoRefactorError) {
if ok, err = CheckRenameParameters(filename, line, column, newName); !ok {
return
}
programTree := parseProgram(filename)
var sym st.Symbol
if sym, err = programTree.FindSymbolByPosition(filename, line, column); err == nil {
if _, ok := sym.(*st.PointerTypeSymbol); ok {
panic("find by position returned pointer type!!!")
}
if st.IsPredeclaredIdentifier(sym.Name()) {
return false, errors.UnrenamableIdentifierError(sym.Name(), " It's a basic language symbol")
}
if sym.PackageFrom().IsGoPackage {
return false, errors.UnrenamableIdentifierError(sym.Name(), " It's a symbol,imported from go library")
}
if unicode.IsUpper(int(sym.Name()[0])) && !unicode.IsUpper(int(newName[0])) ||
unicode.IsLower(int(sym.Name()[0])) && !unicode.IsLower(int(newName[0])) {
return false, &errors.GoRefactorError{ErrorType: "Can't rename identifier", Message: "can't change access modifier. Changing first letter's case can cause errors."}
}
if _, ok := sym.Scope().LookUp(newName, filename); ok {
return false, errors.IdentifierAlreadyExistsError(newName)
}
if meth, ok := sym.(*st.FunctionSymbol); ok {
if meth.IsInterfaceMethod {
return false, errors.UnrenamableIdentifierError(sym.Name(), " It's an interface method")
}
}
if ps, ok := sym.(*st.PackageSymbol); ok {
pack, file := programTree.FindPackageAndFileByFilename(filename)
impDecl := findImportDecl(pack, file, ps)
if impDecl == nil {
panic("couldn't find import decl")
}
if impDecl.Name == nil || impDecl.Name.Name == "" {
impDecl.Name = ast.NewIdent(newName)
}
}
fnames, fsets, files, err := renameSymbol(sym, newName, programTree)
if err == nil {
for i, f := range fnames {
programTree.SaveFileExplicit(f, fsets[i], files[i])
}
}
return err == nil, err
} else {
return false, err
}
panic("unreachable code")
}
func extractInterface(programTree *program.Program, filename string, line int, column int, interfaceName string) (bool, *errors.GoRefactorError) {
if ok, err := CheckExtractInterfaceParameters(filename, line, column, interfaceName); !ok {
return false, err
}
pack, file := programTree.FindPackageAndFileByFilename(filename)
if pack == nil {
return false, errors.ArgumentError("filename", "Program packages don't contain file '"+filename+"'")
}
fset := pack.FileSet
mod := 20000
fset, file = printerUtil.ReparseFile(file, filename, mod, programTree.IdentMap)
tokFile := printerUtil.GetFileFromFileSet(fset, filename)
lines := printerUtil.GetLines(tokFile)
tokFile.SetLines(lines[:len(lines)-(mod)])
if _, ok := pack.Symbols.LookUp(interfaceName, filename); ok {
return false, errors.IdentifierAlreadyExistsError(interfaceName)
}
field, nameNum, fdecl, ok := getSelectedArgument(file, token.Position{filename, 0, line, column}, fset)
if !ok {
return false, &errors.GoRefactorError{ErrorType: "extract interface error", Message: "couldn't find function argument to extract interface"}
}
if field.Names == nil {
return false, &errors.GoRefactorError{ErrorType: "extract interface error", Message: "argument has no name, so empty interface"}
}
varS, ok := programTree.IdentMap.GetSymbol(field.Names[nameNum]).(*st.VariableSymbol)
if !ok {
panic("symbol supposed to be a variable, but it's not")
}
meths, errs := getUsedMethods(programTree, fset, fdecl, varS)
if len(errs) > 0 {
println("some errors don't allow to extract interface:")
for e, _ := range errs {
println(e.String())
}
return false, &errors.GoRefactorError{ErrorType: "extract interface error", Message: "some errors occured, stopped extracting"}
}
methList, i := make([]*ast.Field, len(meths)), 0
for m, _ := range meths {
methList[i] = &ast.Field{nil, []*ast.Ident{ast.NewIdent(m.Name())}, m.FunctionType.ToAstExpr(pack, filename), nil, nil}
i++
}
interfaceMethods := &ast.FieldList{token.NoPos, methList, token.NoPos}
interfaceType := &ast.InterfaceType{token.NoPos, interfaceMethods, false}
interfaceDecl := &ast.TypeSpec{nil, ast.NewIdent(interfaceName), interfaceType, nil}
genDecl := &ast.GenDecl{nil, token.NoPos, token.TYPE, token.NoPos, []ast.Spec{interfaceDecl}, token.NoPos}
fieldNum := 0
for i := 0; i < len(fdecl.Type.Params.List); i++ {
if field == fdecl.Type.Params.List[i] {
fieldNum = i
break
}
}
oldFTypeLen := int(fdecl.Type.End() - fdecl.Type.Pos())
var lField, mField, rField *ast.Field
mField = &ast.Field{nil, []*ast.Ident{field.Names[nameNum]}, ast.NewIdent(interfaceName), nil, nil}
if nameNum > 0 {
lField = &ast.Field{nil, field.Names[:nameNum], field.Type, nil, nil}
}
if nameNum < len(field.Names)-1 {
rField = &ast.Field{nil, field.Names[(nameNum + 1):], field.Type, nil, nil}
}
newList := make([]*ast.Field, fieldNum)
copy(newList, fdecl.Type.Params.List[:fieldNum])
if lField != nil {
newList = append(newList, lField)
}
newList = append(newList, mField)
if rField != nil {
newList = append(newList, rField)
}
newList = append(newList, fdecl.Type.Params.List[(fieldNum+1):]...)
fdecl.Type.Params.List = newList
newFTypeLen, _ := utils.GetNodeLength(fdecl.Type)
newFTypeLen += len(fdecl.Name.Name) + 1
fmt.Printf("old %d new %d\n", oldFTypeLen, newFTypeLen)
allMod := newFTypeLen - oldFTypeLen
if allMod != 0 {
printerUtil.FixPositions(fdecl.Type.End(), allMod, file, true)
lines = printerUtil.GetLines(tokFile)
fmt.Printf("before last (mod = %d) : %v\n", allMod, lines)
for i, offset := range lines {
if offset > tokFile.Offset(fdecl.Type.Pos()) {
for j := i; j < len(lines); j++ {
lines[j] += allMod
}
break
}
}
fmt.Printf("after last (mod = %d) : %v\n", allMod, lines)
if !tokFile.SetLines(lines) {
panic("couldn't set lines for file " + tokFile.Name())
}
}
file.Decls = append(file.Decls, genDecl)
programTree.SaveFileExplicit(filename, fset, file)
return true, nil
}
