|
| 1 | +package main |
| 2 | + |
| 3 | +import ( |
| 4 | + "fmt" |
| 5 | + "go/ast" |
| 6 | + "go/parser" |
| 7 | + "go/token" |
| 8 | + "log" |
| 9 | + "os" |
| 10 | + "path/filepath" |
| 11 | + "strings" |
| 12 | + |
| 13 | + "golang.org/x/xerrors" |
| 14 | +) |
| 15 | + |
| 16 | +const ( |
| 17 | + baseDir = "./codersdk" |
| 18 | +) |
| 19 | + |
| 20 | +func main() { |
| 21 | + err := run() |
| 22 | + if err != nil { |
| 23 | + log.Fatal(err) |
| 24 | + } |
| 25 | +} |
| 26 | + |
| 27 | +func run() error { |
| 28 | + var ( |
| 29 | + astFiles []*ast.File |
| 30 | + enums = make(map[string]string) |
| 31 | + ) |
| 32 | + fset := token.NewFileSet() |
| 33 | + entries, err := os.ReadDir(baseDir) |
| 34 | + if err != nil { |
| 35 | + return xerrors.Errorf("reading dir %s: %w", baseDir, err) |
| 36 | + } |
| 37 | + |
| 38 | + // loop each file in directory |
| 39 | + for _, entry := range entries { |
| 40 | + astFile, err := parser.ParseFile(fset, filepath.Join(baseDir, entry.Name()), nil, 0) |
| 41 | + if err != nil { |
| 42 | + return xerrors.Errorf("parsing file %s: %w", filepath.Join(baseDir, entry.Name()), err) |
| 43 | + } |
| 44 | + |
| 45 | + astFiles = append(astFiles, astFile) |
| 46 | + } |
| 47 | + |
| 48 | + loopSpecs(astFiles, func(spec ast.Spec) { |
| 49 | + pos := fset.Position(spec.Pos()) |
| 50 | + switch s := spec.(type) { |
| 51 | + // TypeSpec case for structs and type alias |
| 52 | + case *ast.TypeSpec: |
| 53 | + out, err := handleTypeSpec(s, pos, enums) |
| 54 | + if err != nil { |
| 55 | + break |
| 56 | + } |
| 57 | + |
| 58 | + _, _ = fmt.Printf(out) |
| 59 | + } |
| 60 | + }) |
| 61 | + |
| 62 | + loopSpecs(astFiles, func(spec ast.Spec) { |
| 63 | + switch s := spec.(type) { |
| 64 | + // ValueSpec case for const "enums" |
| 65 | + case *ast.ValueSpec: |
| 66 | + handleValueSpec(s, enums) |
| 67 | + } |
| 68 | + }) |
| 69 | + |
| 70 | + for _, v := range enums { |
| 71 | + _, _ = fmt.Printf("%s\n", v) |
| 72 | + } |
| 73 | + |
| 74 | + return nil |
| 75 | +} |
| 76 | + |
| 77 | +func loopSpecs(astFiles []*ast.File, fn func(spec ast.Spec)) { |
| 78 | + for _, astFile := range astFiles { |
| 79 | + // loop each declaration in file |
| 80 | + for _, node := range astFile.Decls { |
| 81 | + genDecl, ok := node.(*ast.GenDecl) |
| 82 | + if !ok { |
| 83 | + continue |
| 84 | + } |
| 85 | + for _, spec := range genDecl.Specs { |
| 86 | + fn(spec) |
| 87 | + } |
| 88 | + } |
| 89 | + } |
| 90 | +} |
| 91 | + |
| 92 | +func handleTypeSpec(typeSpec *ast.TypeSpec, pos token.Position, enums map[string]string) (string, error) { |
| 93 | + jsonFields := 0 |
| 94 | + s := fmt.Sprintf("// From %s.\n", pos.String()) |
| 95 | + switch t := typeSpec.Type.(type) { |
| 96 | + // Struct declaration |
| 97 | + case *ast.StructType: |
| 98 | + s = fmt.Sprintf("%sexport interface %s {\n", s, typeSpec.Name.Name) |
| 99 | + for _, field := range t.Fields.List { |
| 100 | + i, optional, err := getIdent(field.Type) |
| 101 | + if err != nil { |
| 102 | + continue |
| 103 | + } |
| 104 | + |
| 105 | + fieldType := toTsType(i.Name) |
| 106 | + if fieldType == "" { |
| 107 | + continue |
| 108 | + } |
| 109 | + |
| 110 | + fieldName := toJSONField(field) |
| 111 | + if fieldName == "" { |
| 112 | + continue |
| 113 | + } |
| 114 | + |
| 115 | + s = fmt.Sprintf("%s %s%s: %s\n", s, fieldName, optional, fieldType) |
| 116 | + jsonFields++ |
| 117 | + } |
| 118 | + |
| 119 | + // Do not print struct if it has no json fields |
| 120 | + if jsonFields == 0 { |
| 121 | + return "", xerrors.New("no json fields") |
| 122 | + } |
| 123 | + |
| 124 | + return fmt.Sprintf("%s}\n\n", s), nil |
| 125 | + // Type alias declaration |
| 126 | + case *ast.Ident: |
| 127 | + // save type declaration to map of types |
| 128 | + // later we come back and add union types to this declaration |
| 129 | + enums[typeSpec.Name.Name] = fmt.Sprintf("%stype %s = \n", s, typeSpec.Name.Name) |
| 130 | + return "", xerrors.New("enums are not printed at this stage") |
| 131 | + default: |
| 132 | + return "", xerrors.New("not struct or alias") |
| 133 | + } |
| 134 | +} |
| 135 | + |
| 136 | +func handleValueSpec(valueSpec *ast.ValueSpec, enums map[string]string) { |
| 137 | + valueValue := "" |
| 138 | + i, ok := valueSpec.Type.(*ast.Ident) |
| 139 | + if !ok { |
| 140 | + return |
| 141 | + } |
| 142 | + valueType := i.Name |
| 143 | + |
| 144 | + for _, value := range valueSpec.Values { |
| 145 | + bl, ok := value.(*ast.BasicLit) |
| 146 | + if !ok { |
| 147 | + return |
| 148 | + } |
| 149 | + valueValue = bl.Value |
| 150 | + break |
| 151 | + } |
| 152 | + |
| 153 | + enums[valueType] = fmt.Sprintf("%s | %s\n", enums[valueType], valueValue) |
| 154 | +} |
| 155 | + |
| 156 | +func getIdent(e ast.Expr) (*ast.Ident, string, error) { |
| 157 | + switch t := e.(type) { |
| 158 | + case *ast.Ident: |
| 159 | + return t, "", nil |
| 160 | + case *ast.StarExpr: |
| 161 | + i, ok := t.X.(*ast.Ident) |
| 162 | + if !ok { |
| 163 | + return nil, "", xerrors.New("failed to cast star expr to indent") |
| 164 | + } |
| 165 | + return i, "?", nil |
| 166 | + default: |
| 167 | + return nil, "", xerrors.New("unknown expr type") |
| 168 | + } |
| 169 | +} |
| 170 | + |
| 171 | +func toTsType(fieldType string) string { |
| 172 | + switch fieldType { |
| 173 | + case "bool": |
| 174 | + return "boolean" |
| 175 | + case "uint64", "uint32", "float64": |
| 176 | + return "number" |
| 177 | + } |
| 178 | + |
| 179 | + return fieldType |
| 180 | +} |
| 181 | + |
| 182 | +func toJSONField(field *ast.Field) string { |
| 183 | + if field.Tag != nil && field.Tag.Value != "" { |
| 184 | + fieldName := strings.Trim(field.Tag.Value, "`") |
| 185 | + for _, pair := range strings.Split(fieldName, " ") { |
| 186 | + if strings.Contains(pair, `json:`) { |
| 187 | + fieldName := strings.TrimPrefix(pair, `json:`) |
| 188 | + fieldName = strings.Trim(fieldName, `"`) |
| 189 | + fieldName = strings.Split(fieldName, ",")[0] |
| 190 | + |
| 191 | + return fieldName |
| 192 | + } |
| 193 | + } |
| 194 | + } |
| 195 | + |
| 196 | + return "" |
| 197 | +} |
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