func makeCallExpr(name string, params *st.SymbolTable, pointerSymbols map[st.Symbol]int, pos token.Pos, recvSym *st.VariableSymbol, pack *st.Package, filename string) (*ast.CallExpr, int) {
var Fun ast.Expr
if recvSym != nil {
x := ast.NewIdent(recvSym.Name())
x.NamePos = pos
Fun = &ast.SelectorExpr{x, ast.NewIdent(name)}
} else {
x := ast.NewIdent(name)
x.NamePos = pos
Fun = x
}
l, _ := utils.GetNodeLength(Fun)
l += 2
args, i := make([]ast.Expr, params.Count()), 0
params.ForEachNoLock(func(sym st.Symbol) {
args[i] = sym.ToAstExpr(pack, filename)
if depth, ok := pointerSymbols[sym]; ok {
for depth > 0 {
args[i] = &ast.UnaryExpr{token.NoPos, token.AND, args[i]}
depth--
}
}
ll, _ := utils.GetNodeLength(args[i])
l += ll + 2
i++
})
l -= 2
return &ast.CallExpr{Fun, token.NoPos, args, token.NoPos, pos + token.Pos(l-1)}, l
}
func (vis *destinationVisitor) Visit(node ast.Node) ast.Visitor {
if node == nil {
return nil
}
switch t := node.(type) {
case *ast.SelectorExpr:
ast.Walk(vis, t.X)
return nil
case *ast.Ident:
newExpr := <-vis.Chan
if newExpr != nil {
printerUtil.FixPositions(0, int(t.Pos()-newExpr.Pos()), newExpr, true)
replaceExpr(vis.FileSet.Position(t.Pos()), vis.FileSet.Position(t.End()), newExpr, vis.FileSet, vis.rootNode)
le, _ := utils.GetNodeLength(newExpr)
mod := le - int(t.End()-t.Pos())
for _, stmt := range vis.destList {
printerUtil.FixPositionsExcept(t.Pos(), mod, stmt, true, map[ast.Node]bool{newExpr: true})
}
for i, _ := range vis.nodeLines {
if vis.nodeLines[i] > vis.TokFile.Offset(t.Pos()) {
vis.nodeLines[i] += mod
}
}
}
return nil
}
return vis
}
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
}