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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,202 @@ | ||
| package patch | ||
|
|
||
| import ( | ||
| "go/ast" | ||
| "go/types" | ||
| "log" | ||
| "strings" | ||
|
|
||
| "golang.org/x/tools/go/ast/astutil" | ||
| ) | ||
|
|
||
| func (p *Patcher) patchTypeDef(id *ast.Ident, obj types.Object) { | ||
| fieldType, ok := p.fieldTypes[obj] | ||
| if !ok { | ||
| return | ||
| } | ||
|
|
||
| parent := p.findParentNode(id) | ||
| if pkg, name, isSlice := packageAndName(fieldType); pkg != "" { | ||
| f := p.fileOf(id) | ||
| pkgImport := packageImport(pkg) | ||
| astutil.AddNamedImport(p.fset, f, pkgImport, pkg) | ||
| fieldType = pkgImport + "." + name | ||
| if isSlice { | ||
| fieldType = "[]" + fieldType | ||
| } | ||
| } | ||
| castDecl := func(v *ast.Field) bool { | ||
| switch t := v.Type.(type) { | ||
| case *ast.Ident: | ||
| t.Name = fieldType | ||
| return true | ||
| case *ast.ArrayType: | ||
| if isSliceType(fieldType) { | ||
| if id, ok := t.Elt.(*ast.Ident); ok { | ||
| id.Name = strings.TrimPrefix(fieldType, "[]") | ||
| return true | ||
| } | ||
| } else { | ||
| v.Type = &ast.Ident{ | ||
| Name: fieldType, | ||
| } | ||
| return true | ||
| } | ||
| return false | ||
| default: | ||
| return false | ||
| } | ||
| } | ||
|
|
||
| // Cast Field definition | ||
| if id.Obj != nil && id.Obj.Decl != nil { | ||
| v, ok := id.Obj.Decl.(*ast.Field) | ||
| if !ok { | ||
| log.Printf("Warning: fieldType declared for non-field object: %v `%s`", obj, fieldType) | ||
| return | ||
| } | ||
| if !castDecl(v) { | ||
| log.Printf("Warning: unsupported fieldType type: %T `%s`", v.Type, fieldType) | ||
| } | ||
| return | ||
| } | ||
| switch obj.Type().(type) { | ||
| // Cast Getter signature | ||
| case *types.Signature: | ||
| n, ok := parent.(*ast.FuncDecl) | ||
| if !ok { | ||
| log.Printf("Warning: unexpected type for getter: %v `%T`", obj, parent) | ||
| break | ||
| } | ||
| if l := len(n.Type.Results.List); l != 1 { | ||
| log.Printf("Warning: unexpected return count for getter: %v `%d`", obj, l) | ||
| return | ||
| } | ||
| if !castDecl(n.Type.Results.List[0]) { | ||
| log.Printf("Warning: unsupported fieldType type: %T `%s`", n.Type.Results.List[0].Type, fieldType) | ||
| } | ||
| return | ||
| } | ||
| } | ||
|
|
||
| func (p *Patcher) patchTypeUsage(id *ast.Ident, obj types.Object) { | ||
| desiredType, ok := p.fieldTypes[obj] | ||
| if !ok { | ||
| return | ||
| } | ||
| var originalType string | ||
| switch t := obj.Type().(type) { | ||
| case *types.Basic: | ||
| originalType = t.Name() | ||
| case *types.Signature: | ||
| if t.Results().Len() != 1 { | ||
| return | ||
| } | ||
| originalType = t.Results().At(0).Type().String() | ||
| } | ||
| usageNode := p.findParentNode(id) | ||
| pkgPath, pkgName, isSlice := packageAndName(desiredType) | ||
| pkgImport := packageImport(pkgPath) | ||
| if pkgPath != "" { | ||
| desiredType = pkgImport + "." + pkgName | ||
| if isSlice { | ||
| desiredType = "[]" + desiredType | ||
| } | ||
| } | ||
| cast := func(as string, expr ast.Expr) ast.Expr { | ||
| if pkgPath != "" && as == desiredType { | ||
| f := p.fileOf(id) | ||
| // astutil.AddNamedImport already check for duplicated imports, so there is no need to do it here | ||
| astutil.AddNamedImport(p.fset, f, pkgImport, pkgPath) | ||
| } | ||
| return &ast.CallExpr{ | ||
| Fun: &ast.Ident{ | ||
| Name: as, | ||
| }, | ||
| Args: []ast.Expr{expr}, | ||
| } | ||
| } | ||
| parentNode := p.findParentNode(usageNode) | ||
|
|
||
| switch usage := usageNode.(type) { | ||
| case *ast.SelectorExpr: | ||
| switch parentExpr := parentNode.(type) { | ||
| case *ast.AssignStmt: | ||
| if len(parentExpr.Lhs) != len(parentExpr.Rhs) { | ||
| return | ||
| } | ||
| for i := range parentExpr.Lhs { | ||
| if parentExpr.Lhs[i] == usage { | ||
| parentExpr.Rhs[i] = cast(desiredType, parentExpr.Rhs[i]) | ||
| return | ||
| } | ||
| } | ||
| for i := range parentExpr.Rhs { | ||
| if parentExpr.Rhs[i] == usage { | ||
| parentExpr.Rhs[i] = cast(originalType, parentExpr.Rhs[i]) | ||
| return | ||
| } | ||
| } | ||
| case *ast.CallExpr: | ||
| parent := p.findParentNode(parentExpr) | ||
| assign, isAssign := parent.(*ast.AssignStmt) | ||
| if parentExpr.Fun == usage && isAssign { | ||
| for i := range assign.Rhs { | ||
| if assign.Rhs[i] == parentExpr { | ||
| assign.Rhs[i] = cast(originalType, assign.Rhs[i]) | ||
| return | ||
| } | ||
| } | ||
| } | ||
| call, isCall := parent.(*ast.CallExpr) | ||
| if isCall { | ||
| for i := range call.Args { | ||
| if call.Args[i] == parentExpr { | ||
| call.Args[i] = cast(originalType, call.Args[i]) | ||
| return | ||
| } | ||
| } | ||
| } | ||
| for i, v := range parentExpr.Args { | ||
| if v == usage { | ||
| parentExpr.Args[i] = cast(originalType, usage) | ||
| return | ||
| } | ||
| } | ||
| case *ast.BinaryExpr: | ||
| if parentExpr.X == usage { | ||
| parentExpr.X = cast(originalType, parentExpr.X) | ||
| } | ||
| if parentExpr.Y == usage { | ||
| parentExpr.Y = cast(originalType, parentExpr.Y) | ||
| } | ||
| } | ||
| case *ast.KeyValueExpr: | ||
| if usage.Key == id { | ||
| usage.Value = cast(desiredType, usage.Value) | ||
| return | ||
| } | ||
| if usage.Value == id { | ||
| usage.Value = cast(originalType, usage.Value) | ||
| return | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func packageAndName(fqn string) (pkg string, name string, isSlice bool) { | ||
| isSlice = isSliceType(fqn) | ||
| fqn = strings.TrimPrefix(fqn, "[]") | ||
| parts := strings.Split(fqn, ".") | ||
| if len(parts) == 1 { | ||
| return "", fqn, isSlice | ||
| } | ||
| return strings.Join(parts[:len(parts)-1], "."), parts[len(parts)-1], isSlice | ||
| } | ||
|
|
||
| func isSliceType(typeName string) bool { | ||
| return strings.HasPrefix(typeName, "[]") | ||
| } | ||
|
|
||
| func packageImport(pkg string) string { | ||
| return strings.Replace(strings.Replace(pkg, "/", "_", -1), ".", "_", -1) | ||
| } |
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