package salix import ( "errors" "reflect" "go.elara.ws/salix/internal/ast" ) var ErrForTagInvalidArgs = errors.New("invalid arguments in for tag") // forTag represents a #if tag within a Salix template type forTag struct{} func (ft forTag) Run(tc *TagContext, block, args []ast.Node) error { if len(args) == 0 || len(args) > 2 { return ErrForTagInvalidArgs } var expr ast.ExprSegment if len(args) == 1 { expr2, ok := args[0].(ast.ExprSegment) if !ok { return ErrForTagInvalidArgs } expr = expr2 } else if len(args) == 2 { expr2, ok := args[1].(ast.ExprSegment) if !ok { return ErrForTagInvalidArgs } expr = expr2 } var vars []string var in reflect.Value if len(args) == 2 { varName, ok := unwrap(args[0]).(ast.Ident) if !ok { return ErrForTagInvalidArgs } vars = append(vars, varName.Value) } varName, ok := unwrap(expr.Value).(ast.Ident) if !ok { return ErrForTagInvalidArgs } vars = append(vars, varName.Value) if len(expr.Rest) != 1 { return ErrForTagInvalidArgs } rest := expr.Rest[0] if rest.Operator.Value != "in" { return ErrForTagInvalidArgs } val, err := tc.GetValue(rest, nil) if err != nil { return err } in = reflect.ValueOf(val) switch in.Kind() { case reflect.Slice, reflect.Array: local := map[string]any{} for i := 0; i < in.Len(); i++ { if len(vars) == 1 { local[vars[0]] = in.Index(i).Interface() } else if len(vars) == 2 { local[vars[0]] = i local[vars[1]] = in.Index(i).Interface() } err = tc.Execute(block, local) if err != nil { return err } } case reflect.Map: local := map[string]any{} iter := in.MapRange() for iter.Next() { if len(vars) == 1 { local[vars[0]] = iter.Value().Interface() } else if len(vars) == 2 { local[vars[0]] = iter.Key().Interface() local[vars[1]] = iter.Value().Interface() } err = tc.Execute(block, local) if err != nil { return err } } } return nil } func unwrap(n ast.Node) ast.Node { if v, ok := n.(ast.Value); ok { return v.Node } return n }