/usr/share/gocode/src/github.com/naoina/toml/encode.go is in golang-github-naoina-toml-dev 0.1.1-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 | package toml
import (
"bytes"
"encoding"
"fmt"
"io"
"reflect"
"sort"
"strconv"
"time"
"github.com/naoina/toml/ast"
)
const (
tagOmitempty = "omitempty"
tagSkip = "-"
)
// Marshal returns the TOML encoding of v.
//
// Struct values encode as TOML. Each exported struct field becomes a field of
// the TOML structure unless
// - the field's tag is "-", or
// - the field is empty and its tag specifies the "omitempty" option.
//
// The "toml" key in the struct field's tag value is the key name, followed by
// an optional comma and options. Examples:
//
// // Field is ignored by this package.
// Field int `toml:"-"`
//
// // Field appears in TOML as key "myName".
// Field int `toml:"myName"`
//
// // Field appears in TOML as key "myName" and the field is omitted from the
// // result of encoding if its value is empty.
// Field int `toml:"myName,omitempty"`
//
// // Field appears in TOML as key "field", but the field is skipped if
// // empty. Note the leading comma.
// Field int `toml:",omitempty"`
func (cfg *Config) Marshal(v interface{}) ([]byte, error) {
buf := new(bytes.Buffer)
err := cfg.NewEncoder(buf).Encode(v)
return buf.Bytes(), err
}
// A Encoder writes TOML to an output stream.
type Encoder struct {
w io.Writer
cfg *Config
}
// NewEncoder returns a new Encoder that writes to w.
func (cfg *Config) NewEncoder(w io.Writer) *Encoder {
return &Encoder{w, cfg}
}
// Encode writes the TOML of v to the stream.
// See the documentation for Marshal for details about the conversion of Go values to TOML.
func (e *Encoder) Encode(v interface{}) error {
rv := reflect.ValueOf(v)
for rv.Kind() == reflect.Ptr {
if rv.IsNil() {
return &marshalNilError{rv.Type()}
}
rv = rv.Elem()
}
buf := &tableBuf{typ: ast.TableTypeNormal}
var err error
switch rv.Kind() {
case reflect.Struct:
err = buf.structFields(e.cfg, rv)
case reflect.Map:
err = buf.mapFields(e.cfg, rv)
default:
err = &marshalTableError{rv.Type()}
}
if err != nil {
return err
}
return buf.writeTo(e.w, "")
}
// Marshaler can be implemented to override the encoding of TOML values. The returned text
// must be a simple TOML value (i.e. not a table) and is inserted into marshaler output.
//
// This interface exists for backwards-compatibility reasons. You probably want to
// implement encoding.TextMarshaler or MarshalerRec instead.
type Marshaler interface {
MarshalTOML() ([]byte, error)
}
// MarshalerRec can be implemented to override the TOML encoding of a type.
// The returned value is marshaled in place of the receiver.
type MarshalerRec interface {
MarshalTOML() (interface{}, error)
}
type tableBuf struct {
name string // already escaped / quoted
body []byte
children []*tableBuf
typ ast.TableType
arrayDepth int
}
func (b *tableBuf) writeTo(w io.Writer, prefix string) error {
key := b.name // TODO: escape dots
if prefix != "" {
key = prefix + "." + key
}
if b.name != "" {
head := "[" + key + "]"
if b.typ == ast.TableTypeArray {
head = "[" + head + "]"
}
head += "\n"
if _, err := io.WriteString(w, head); err != nil {
return err
}
}
if _, err := w.Write(b.body); err != nil {
return err
}
for i, child := range b.children {
if len(b.body) > 0 || i > 0 {
if _, err := w.Write([]byte("\n")); err != nil {
return err
}
}
if err := child.writeTo(w, key); err != nil {
return err
}
}
return nil
}
func (b *tableBuf) newChild(name string) *tableBuf {
child := &tableBuf{name: quoteName(name), typ: ast.TableTypeNormal}
if b.arrayDepth > 0 {
child.typ = ast.TableTypeArray
}
return child
}
func (b *tableBuf) addChild(child *tableBuf) {
// Empty table elision: we can avoid writing a table that doesn't have any keys on its
// own. Array tables can't be elided because they define array elements (which would
// be missing if elided).
if len(child.body) == 0 && child.typ == ast.TableTypeNormal {
for _, gchild := range child.children {
gchild.name = child.name + "." + gchild.name
b.addChild(gchild)
}
return
}
b.children = append(b.children, child)
}
func (b *tableBuf) structFields(cfg *Config, rv reflect.Value) error {
rt := rv.Type()
for i := 0; i < rv.NumField(); i++ {
ft := rt.Field(i)
if ft.PkgPath != "" && !ft.Anonymous { // not exported
continue
}
name, rest := extractTag(ft.Tag.Get(fieldTagName))
if name == tagSkip {
continue
}
fv := rv.Field(i)
if rest == tagOmitempty && isEmptyValue(fv) {
continue
}
if name == "" {
name = cfg.FieldToKey(rt, ft.Name)
}
if err := b.field(cfg, name, fv); err != nil {
return err
}
}
return nil
}
type mapKeyList []struct {
key string
value reflect.Value
}
func (l mapKeyList) Len() int { return len(l) }
func (l mapKeyList) Swap(i, j int) { l[i], l[j] = l[j], l[i] }
func (l mapKeyList) Less(i, j int) bool { return l[i].key < l[j].key }
func (b *tableBuf) mapFields(cfg *Config, rv reflect.Value) error {
keys := rv.MapKeys()
keylist := make(mapKeyList, len(keys))
for i, key := range keys {
var err error
keylist[i].key, err = encodeMapKey(key)
if err != nil {
return err
}
keylist[i].value = rv.MapIndex(key)
}
sort.Sort(keylist)
for _, kv := range keylist {
if err := b.field(cfg, kv.key, kv.value); err != nil {
return err
}
}
return nil
}
func (b *tableBuf) field(cfg *Config, name string, rv reflect.Value) error {
off := len(b.body)
b.body = append(b.body, quoteName(name)...)
b.body = append(b.body, " = "...)
isTable, err := b.value(cfg, rv, name)
if isTable {
b.body = b.body[:off] // rub out "key ="
} else {
b.body = append(b.body, '\n')
}
return err
}
func (b *tableBuf) value(cfg *Config, rv reflect.Value, name string) (bool, error) {
isMarshaler, isTable, err := b.marshaler(cfg, rv, name)
if isMarshaler {
return isTable, err
}
switch rv.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
b.body = strconv.AppendInt(b.body, rv.Int(), 10)
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
b.body = strconv.AppendUint(b.body, rv.Uint(), 10)
case reflect.Float32, reflect.Float64:
b.body = strconv.AppendFloat(b.body, rv.Float(), 'e', -1, 64)
case reflect.Bool:
b.body = strconv.AppendBool(b.body, rv.Bool())
case reflect.String:
b.body = strconv.AppendQuote(b.body, rv.String())
case reflect.Ptr, reflect.Interface:
if rv.IsNil() {
return false, &marshalNilError{rv.Type()}
}
return b.value(cfg, rv.Elem(), name)
case reflect.Slice, reflect.Array:
rvlen := rv.Len()
if rvlen == 0 {
b.body = append(b.body, '[', ']')
return false, nil
}
b.arrayDepth++
wroteElem := false
b.body = append(b.body, '[')
for i := 0; i < rvlen; i++ {
isTable, err := b.value(cfg, rv.Index(i), name)
if err != nil {
return isTable, err
}
wroteElem = wroteElem || !isTable
if wroteElem {
if i < rvlen-1 {
b.body = append(b.body, ',', ' ')
} else {
b.body = append(b.body, ']')
}
}
}
if !wroteElem {
b.body = b.body[:len(b.body)-1] // rub out '['
}
b.arrayDepth--
return !wroteElem, nil
case reflect.Struct:
child := b.newChild(name)
err := child.structFields(cfg, rv)
b.addChild(child)
return true, err
case reflect.Map:
child := b.newChild(name)
err := child.mapFields(cfg, rv)
b.addChild(child)
return true, err
default:
return false, fmt.Errorf("toml: marshal: unsupported type %v", rv.Kind())
}
return false, nil
}
func (b *tableBuf) marshaler(cfg *Config, rv reflect.Value, name string) (handled, isTable bool, err error) {
switch t := rv.Interface().(type) {
case encoding.TextMarshaler:
enc, err := t.MarshalText()
if err != nil {
return true, false, err
}
b.body = encodeTextMarshaler(b.body, string(enc))
return true, false, nil
case MarshalerRec:
newval, err := t.MarshalTOML()
if err != nil {
return true, false, err
}
isTable, err = b.value(cfg, reflect.ValueOf(newval), name)
return true, isTable, err
case Marshaler:
enc, err := t.MarshalTOML()
if err != nil {
return true, false, err
}
b.body = append(b.body, enc...)
return true, false, nil
}
return false, false, nil
}
func encodeTextMarshaler(buf []byte, v string) []byte {
// Emit the value without quotes if possible.
if v == "true" || v == "false" {
return append(buf, v...)
} else if _, err := time.Parse(time.RFC3339Nano, v); err == nil {
return append(buf, v...)
} else if _, err := strconv.ParseInt(v, 10, 64); err == nil {
return append(buf, v...)
} else if _, err := strconv.ParseUint(v, 10, 64); err == nil {
return append(buf, v...)
} else if _, err := strconv.ParseFloat(v, 64); err == nil {
return append(buf, v...)
}
return strconv.AppendQuote(buf, v)
}
func encodeMapKey(rv reflect.Value) (string, error) {
if rv.Kind() == reflect.String {
return rv.String(), nil
}
if tm, ok := rv.Interface().(encoding.TextMarshaler); ok {
b, err := tm.MarshalText()
return string(b), err
}
switch rv.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return strconv.FormatInt(rv.Int(), 10), nil
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return strconv.FormatUint(rv.Uint(), 10), nil
}
return "", fmt.Errorf("toml: invalid map key type %v", rv.Type())
}
func isEmptyValue(v reflect.Value) bool {
switch v.Kind() {
case reflect.Array:
// encoding/json treats all arrays with non-zero length as non-empty. We check the
// array content here because zero-length arrays are almost never used.
len := v.Len()
for i := 0; i < len; i++ {
if !isEmptyValue(v.Index(i)) {
return false
}
}
return true
case reflect.Map, reflect.Slice, reflect.String:
return v.Len() == 0
case reflect.Bool:
return !v.Bool()
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return v.Int() == 0
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return v.Uint() == 0
case reflect.Float32, reflect.Float64:
return v.Float() == 0
case reflect.Interface, reflect.Ptr:
return v.IsNil()
}
return false
}
func quoteName(s string) string {
if len(s) == 0 {
return strconv.Quote(s)
}
for _, r := range s {
if r >= '0' && r <= '9' || r >= 'A' && r <= 'Z' || r >= 'a' && r <= 'z' || r == '-' || r == '_' {
continue
}
return strconv.Quote(s)
}
return s
}
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