mirror of
https://github.com/astaxie/beego.git
synced 2024-11-18 00:40:53 +00:00
363 lines
8.6 KiB
Go
363 lines
8.6 KiB
Go
package yaml
|
|
|
|
import (
|
|
"encoding"
|
|
"fmt"
|
|
"io"
|
|
"reflect"
|
|
"regexp"
|
|
"sort"
|
|
"strconv"
|
|
"strings"
|
|
"time"
|
|
"unicode/utf8"
|
|
)
|
|
|
|
type encoder struct {
|
|
emitter yaml_emitter_t
|
|
event yaml_event_t
|
|
out []byte
|
|
flow bool
|
|
// doneInit holds whether the initial stream_start_event has been
|
|
// emitted.
|
|
doneInit bool
|
|
}
|
|
|
|
func newEncoder() *encoder {
|
|
e := &encoder{}
|
|
yaml_emitter_initialize(&e.emitter)
|
|
yaml_emitter_set_output_string(&e.emitter, &e.out)
|
|
yaml_emitter_set_unicode(&e.emitter, true)
|
|
return e
|
|
}
|
|
|
|
func newEncoderWithWriter(w io.Writer) *encoder {
|
|
e := &encoder{}
|
|
yaml_emitter_initialize(&e.emitter)
|
|
yaml_emitter_set_output_writer(&e.emitter, w)
|
|
yaml_emitter_set_unicode(&e.emitter, true)
|
|
return e
|
|
}
|
|
|
|
func (e *encoder) init() {
|
|
if e.doneInit {
|
|
return
|
|
}
|
|
yaml_stream_start_event_initialize(&e.event, yaml_UTF8_ENCODING)
|
|
e.emit()
|
|
e.doneInit = true
|
|
}
|
|
|
|
func (e *encoder) finish() {
|
|
e.emitter.open_ended = false
|
|
yaml_stream_end_event_initialize(&e.event)
|
|
e.emit()
|
|
}
|
|
|
|
func (e *encoder) destroy() {
|
|
yaml_emitter_delete(&e.emitter)
|
|
}
|
|
|
|
func (e *encoder) emit() {
|
|
// This will internally delete the e.event value.
|
|
e.must(yaml_emitter_emit(&e.emitter, &e.event))
|
|
}
|
|
|
|
func (e *encoder) must(ok bool) {
|
|
if !ok {
|
|
msg := e.emitter.problem
|
|
if msg == "" {
|
|
msg = "unknown problem generating YAML content"
|
|
}
|
|
failf("%s", msg)
|
|
}
|
|
}
|
|
|
|
func (e *encoder) marshalDoc(tag string, in reflect.Value) {
|
|
e.init()
|
|
yaml_document_start_event_initialize(&e.event, nil, nil, true)
|
|
e.emit()
|
|
e.marshal(tag, in)
|
|
yaml_document_end_event_initialize(&e.event, true)
|
|
e.emit()
|
|
}
|
|
|
|
func (e *encoder) marshal(tag string, in reflect.Value) {
|
|
if !in.IsValid() || in.Kind() == reflect.Ptr && in.IsNil() {
|
|
e.nilv()
|
|
return
|
|
}
|
|
iface := in.Interface()
|
|
switch m := iface.(type) {
|
|
case time.Time, *time.Time:
|
|
// Although time.Time implements TextMarshaler,
|
|
// we don't want to treat it as a string for YAML
|
|
// purposes because YAML has special support for
|
|
// timestamps.
|
|
case Marshaler:
|
|
v, err := m.MarshalYAML()
|
|
if err != nil {
|
|
fail(err)
|
|
}
|
|
if v == nil {
|
|
e.nilv()
|
|
return
|
|
}
|
|
in = reflect.ValueOf(v)
|
|
case encoding.TextMarshaler:
|
|
text, err := m.MarshalText()
|
|
if err != nil {
|
|
fail(err)
|
|
}
|
|
in = reflect.ValueOf(string(text))
|
|
case nil:
|
|
e.nilv()
|
|
return
|
|
}
|
|
switch in.Kind() {
|
|
case reflect.Interface:
|
|
e.marshal(tag, in.Elem())
|
|
case reflect.Map:
|
|
e.mapv(tag, in)
|
|
case reflect.Ptr:
|
|
if in.Type() == ptrTimeType {
|
|
e.timev(tag, in.Elem())
|
|
} else {
|
|
e.marshal(tag, in.Elem())
|
|
}
|
|
case reflect.Struct:
|
|
if in.Type() == timeType {
|
|
e.timev(tag, in)
|
|
} else {
|
|
e.structv(tag, in)
|
|
}
|
|
case reflect.Slice, reflect.Array:
|
|
if in.Type().Elem() == mapItemType {
|
|
e.itemsv(tag, in)
|
|
} else {
|
|
e.slicev(tag, in)
|
|
}
|
|
case reflect.String:
|
|
e.stringv(tag, in)
|
|
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
|
if in.Type() == durationType {
|
|
e.stringv(tag, reflect.ValueOf(iface.(time.Duration).String()))
|
|
} else {
|
|
e.intv(tag, in)
|
|
}
|
|
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
|
|
e.uintv(tag, in)
|
|
case reflect.Float32, reflect.Float64:
|
|
e.floatv(tag, in)
|
|
case reflect.Bool:
|
|
e.boolv(tag, in)
|
|
default:
|
|
panic("cannot marshal type: " + in.Type().String())
|
|
}
|
|
}
|
|
|
|
func (e *encoder) mapv(tag string, in reflect.Value) {
|
|
e.mappingv(tag, func() {
|
|
keys := keyList(in.MapKeys())
|
|
sort.Sort(keys)
|
|
for _, k := range keys {
|
|
e.marshal("", k)
|
|
e.marshal("", in.MapIndex(k))
|
|
}
|
|
})
|
|
}
|
|
|
|
func (e *encoder) itemsv(tag string, in reflect.Value) {
|
|
e.mappingv(tag, func() {
|
|
slice := in.Convert(reflect.TypeOf([]MapItem{})).Interface().([]MapItem)
|
|
for _, item := range slice {
|
|
e.marshal("", reflect.ValueOf(item.Key))
|
|
e.marshal("", reflect.ValueOf(item.Value))
|
|
}
|
|
})
|
|
}
|
|
|
|
func (e *encoder) structv(tag string, in reflect.Value) {
|
|
sinfo, err := getStructInfo(in.Type())
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
e.mappingv(tag, func() {
|
|
for _, info := range sinfo.FieldsList {
|
|
var value reflect.Value
|
|
if info.Inline == nil {
|
|
value = in.Field(info.Num)
|
|
} else {
|
|
value = in.FieldByIndex(info.Inline)
|
|
}
|
|
if info.OmitEmpty && isZero(value) {
|
|
continue
|
|
}
|
|
e.marshal("", reflect.ValueOf(info.Key))
|
|
e.flow = info.Flow
|
|
e.marshal("", value)
|
|
}
|
|
if sinfo.InlineMap >= 0 {
|
|
m := in.Field(sinfo.InlineMap)
|
|
if m.Len() > 0 {
|
|
e.flow = false
|
|
keys := keyList(m.MapKeys())
|
|
sort.Sort(keys)
|
|
for _, k := range keys {
|
|
if _, found := sinfo.FieldsMap[k.String()]; found {
|
|
panic(fmt.Sprintf("Can't have key %q in inlined map; conflicts with struct field", k.String()))
|
|
}
|
|
e.marshal("", k)
|
|
e.flow = false
|
|
e.marshal("", m.MapIndex(k))
|
|
}
|
|
}
|
|
}
|
|
})
|
|
}
|
|
|
|
func (e *encoder) mappingv(tag string, f func()) {
|
|
implicit := tag == ""
|
|
style := yaml_BLOCK_MAPPING_STYLE
|
|
if e.flow {
|
|
e.flow = false
|
|
style = yaml_FLOW_MAPPING_STYLE
|
|
}
|
|
yaml_mapping_start_event_initialize(&e.event, nil, []byte(tag), implicit, style)
|
|
e.emit()
|
|
f()
|
|
yaml_mapping_end_event_initialize(&e.event)
|
|
e.emit()
|
|
}
|
|
|
|
func (e *encoder) slicev(tag string, in reflect.Value) {
|
|
implicit := tag == ""
|
|
style := yaml_BLOCK_SEQUENCE_STYLE
|
|
if e.flow {
|
|
e.flow = false
|
|
style = yaml_FLOW_SEQUENCE_STYLE
|
|
}
|
|
e.must(yaml_sequence_start_event_initialize(&e.event, nil, []byte(tag), implicit, style))
|
|
e.emit()
|
|
n := in.Len()
|
|
for i := 0; i < n; i++ {
|
|
e.marshal("", in.Index(i))
|
|
}
|
|
e.must(yaml_sequence_end_event_initialize(&e.event))
|
|
e.emit()
|
|
}
|
|
|
|
// isBase60 returns whether s is in base 60 notation as defined in YAML 1.1.
|
|
//
|
|
// The base 60 float notation in YAML 1.1 is a terrible idea and is unsupported
|
|
// in YAML 1.2 and by this package, but these should be marshalled quoted for
|
|
// the time being for compatibility with other parsers.
|
|
func isBase60Float(s string) (result bool) {
|
|
// Fast path.
|
|
if s == "" {
|
|
return false
|
|
}
|
|
c := s[0]
|
|
if !(c == '+' || c == '-' || c >= '0' && c <= '9') || strings.IndexByte(s, ':') < 0 {
|
|
return false
|
|
}
|
|
// Do the full match.
|
|
return base60float.MatchString(s)
|
|
}
|
|
|
|
// From http://yaml.org/type/float.html, except the regular expression there
|
|
// is bogus. In practice parsers do not enforce the "\.[0-9_]*" suffix.
|
|
var base60float = regexp.MustCompile(`^[-+]?[0-9][0-9_]*(?::[0-5]?[0-9])+(?:\.[0-9_]*)?$`)
|
|
|
|
func (e *encoder) stringv(tag string, in reflect.Value) {
|
|
var style yaml_scalar_style_t
|
|
s := in.String()
|
|
canUsePlain := true
|
|
switch {
|
|
case !utf8.ValidString(s):
|
|
if tag == yaml_BINARY_TAG {
|
|
failf("explicitly tagged !!binary data must be base64-encoded")
|
|
}
|
|
if tag != "" {
|
|
failf("cannot marshal invalid UTF-8 data as %s", shortTag(tag))
|
|
}
|
|
// It can't be encoded directly as YAML so use a binary tag
|
|
// and encode it as base64.
|
|
tag = yaml_BINARY_TAG
|
|
s = encodeBase64(s)
|
|
case tag == "":
|
|
// Check to see if it would resolve to a specific
|
|
// tag when encoded unquoted. If it doesn't,
|
|
// there's no need to quote it.
|
|
rtag, _ := resolve("", s)
|
|
canUsePlain = rtag == yaml_STR_TAG && !isBase60Float(s)
|
|
}
|
|
// Note: it's possible for user code to emit invalid YAML
|
|
// if they explicitly specify a tag and a string containing
|
|
// text that's incompatible with that tag.
|
|
switch {
|
|
case strings.Contains(s, "\n"):
|
|
style = yaml_LITERAL_SCALAR_STYLE
|
|
case canUsePlain:
|
|
style = yaml_PLAIN_SCALAR_STYLE
|
|
default:
|
|
style = yaml_DOUBLE_QUOTED_SCALAR_STYLE
|
|
}
|
|
e.emitScalar(s, "", tag, style)
|
|
}
|
|
|
|
func (e *encoder) boolv(tag string, in reflect.Value) {
|
|
var s string
|
|
if in.Bool() {
|
|
s = "true"
|
|
} else {
|
|
s = "false"
|
|
}
|
|
e.emitScalar(s, "", tag, yaml_PLAIN_SCALAR_STYLE)
|
|
}
|
|
|
|
func (e *encoder) intv(tag string, in reflect.Value) {
|
|
s := strconv.FormatInt(in.Int(), 10)
|
|
e.emitScalar(s, "", tag, yaml_PLAIN_SCALAR_STYLE)
|
|
}
|
|
|
|
func (e *encoder) uintv(tag string, in reflect.Value) {
|
|
s := strconv.FormatUint(in.Uint(), 10)
|
|
e.emitScalar(s, "", tag, yaml_PLAIN_SCALAR_STYLE)
|
|
}
|
|
|
|
func (e *encoder) timev(tag string, in reflect.Value) {
|
|
t := in.Interface().(time.Time)
|
|
s := t.Format(time.RFC3339Nano)
|
|
e.emitScalar(s, "", tag, yaml_PLAIN_SCALAR_STYLE)
|
|
}
|
|
|
|
func (e *encoder) floatv(tag string, in reflect.Value) {
|
|
// Issue #352: When formatting, use the precision of the underlying value
|
|
precision := 64
|
|
if in.Kind() == reflect.Float32 {
|
|
precision = 32
|
|
}
|
|
|
|
s := strconv.FormatFloat(in.Float(), 'g', -1, precision)
|
|
switch s {
|
|
case "+Inf":
|
|
s = ".inf"
|
|
case "-Inf":
|
|
s = "-.inf"
|
|
case "NaN":
|
|
s = ".nan"
|
|
}
|
|
e.emitScalar(s, "", tag, yaml_PLAIN_SCALAR_STYLE)
|
|
}
|
|
|
|
func (e *encoder) nilv() {
|
|
e.emitScalar("null", "", "", yaml_PLAIN_SCALAR_STYLE)
|
|
}
|
|
|
|
func (e *encoder) emitScalar(value, anchor, tag string, style yaml_scalar_style_t) {
|
|
implicit := tag == ""
|
|
e.must(yaml_scalar_event_initialize(&e.event, []byte(anchor), []byte(tag), []byte(value), implicit, implicit, style))
|
|
e.emit()
|
|
}
|