391 lines
9.6 KiB
Go
391 lines
9.6 KiB
Go
package yaml
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import (
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"encoding"
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"fmt"
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"io"
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"reflect"
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"regexp"
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"sort"
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"strconv"
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"strings"
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"time"
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"unicode/utf8"
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)
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// jsonNumber is the interface of the encoding/json.Number datatype.
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// Repeating the interface here avoids a dependency on encoding/json, and also
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// supports other libraries like jsoniter, which use a similar datatype with
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// the same interface. Detecting this interface is useful when dealing with
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// structures containing json.Number, which is a string under the hood. The
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// encoder should prefer the use of Int64(), Float64() and string(), in that
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// order, when encoding this type.
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type jsonNumber interface {
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Float64() (float64, error)
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Int64() (int64, error)
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String() string
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}
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type encoder struct {
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emitter yaml_emitter_t
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event yaml_event_t
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out []byte
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flow bool
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// doneInit holds whether the initial stream_start_event has been
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// emitted.
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doneInit bool
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}
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func newEncoder() *encoder {
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e := &encoder{}
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yaml_emitter_initialize(&e.emitter)
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yaml_emitter_set_output_string(&e.emitter, &e.out)
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yaml_emitter_set_unicode(&e.emitter, true)
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return e
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}
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func newEncoderWithWriter(w io.Writer) *encoder {
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e := &encoder{}
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yaml_emitter_initialize(&e.emitter)
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yaml_emitter_set_output_writer(&e.emitter, w)
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yaml_emitter_set_unicode(&e.emitter, true)
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return e
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}
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func (e *encoder) init() {
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if e.doneInit {
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return
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}
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yaml_stream_start_event_initialize(&e.event, yaml_UTF8_ENCODING)
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e.emit()
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e.doneInit = true
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}
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func (e *encoder) finish() {
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e.emitter.open_ended = false
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yaml_stream_end_event_initialize(&e.event)
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e.emit()
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}
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func (e *encoder) destroy() {
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yaml_emitter_delete(&e.emitter)
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}
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func (e *encoder) emit() {
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// This will internally delete the e.event value.
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e.must(yaml_emitter_emit(&e.emitter, &e.event))
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}
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func (e *encoder) must(ok bool) {
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if !ok {
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msg := e.emitter.problem
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if msg == "" {
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msg = "unknown problem generating YAML content"
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}
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failf("%s", msg)
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}
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}
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func (e *encoder) marshalDoc(tag string, in reflect.Value) {
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e.init()
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yaml_document_start_event_initialize(&e.event, nil, nil, true)
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e.emit()
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e.marshal(tag, in)
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yaml_document_end_event_initialize(&e.event, true)
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e.emit()
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}
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func (e *encoder) marshal(tag string, in reflect.Value) {
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if !in.IsValid() || in.Kind() == reflect.Ptr && in.IsNil() {
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e.nilv()
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return
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}
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iface := in.Interface()
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switch m := iface.(type) {
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case jsonNumber:
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integer, err := m.Int64()
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if err == nil {
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// In this case the json.Number is a valid int64
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in = reflect.ValueOf(integer)
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break
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}
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float, err := m.Float64()
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if err == nil {
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// In this case the json.Number is a valid float64
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in = reflect.ValueOf(float)
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break
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}
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// fallback case - no number could be obtained
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in = reflect.ValueOf(m.String())
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case time.Time, *time.Time:
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// Although time.Time implements TextMarshaler,
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// we don't want to treat it as a string for YAML
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// purposes because YAML has special support for
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// timestamps.
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case Marshaler:
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v, err := m.MarshalYAML()
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if err != nil {
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fail(err)
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}
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if v == nil {
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e.nilv()
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return
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}
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in = reflect.ValueOf(v)
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case encoding.TextMarshaler:
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text, err := m.MarshalText()
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if err != nil {
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fail(err)
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}
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in = reflect.ValueOf(string(text))
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case nil:
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e.nilv()
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return
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}
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switch in.Kind() {
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case reflect.Interface:
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e.marshal(tag, in.Elem())
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case reflect.Map:
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e.mapv(tag, in)
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case reflect.Ptr:
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if in.Type() == ptrTimeType {
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e.timev(tag, in.Elem())
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} else {
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e.marshal(tag, in.Elem())
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}
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case reflect.Struct:
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if in.Type() == timeType {
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e.timev(tag, in)
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} else {
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e.structv(tag, in)
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}
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case reflect.Slice, reflect.Array:
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if in.Type().Elem() == mapItemType {
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e.itemsv(tag, in)
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} else {
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e.slicev(tag, in)
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}
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case reflect.String:
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e.stringv(tag, in)
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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if in.Type() == durationType {
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e.stringv(tag, reflect.ValueOf(iface.(time.Duration).String()))
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} else {
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e.intv(tag, in)
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}
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
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e.uintv(tag, in)
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case reflect.Float32, reflect.Float64:
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e.floatv(tag, in)
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case reflect.Bool:
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e.boolv(tag, in)
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default:
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panic("cannot marshal type: " + in.Type().String())
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}
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}
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func (e *encoder) mapv(tag string, in reflect.Value) {
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e.mappingv(tag, func() {
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keys := keyList(in.MapKeys())
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sort.Sort(keys)
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for _, k := range keys {
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e.marshal("", k)
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e.marshal("", in.MapIndex(k))
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}
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})
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}
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func (e *encoder) itemsv(tag string, in reflect.Value) {
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e.mappingv(tag, func() {
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slice := in.Convert(reflect.TypeOf([]MapItem{})).Interface().([]MapItem)
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for _, item := range slice {
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e.marshal("", reflect.ValueOf(item.Key))
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e.marshal("", reflect.ValueOf(item.Value))
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}
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})
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}
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func (e *encoder) structv(tag string, in reflect.Value) {
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sinfo, err := getStructInfo(in.Type())
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if err != nil {
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panic(err)
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}
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e.mappingv(tag, func() {
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for _, info := range sinfo.FieldsList {
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var value reflect.Value
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if info.Inline == nil {
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value = in.Field(info.Num)
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} else {
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value = in.FieldByIndex(info.Inline)
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}
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if info.OmitEmpty && isZero(value) {
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continue
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}
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e.marshal("", reflect.ValueOf(info.Key))
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e.flow = info.Flow
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e.marshal("", value)
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}
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if sinfo.InlineMap >= 0 {
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m := in.Field(sinfo.InlineMap)
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if m.Len() > 0 {
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e.flow = false
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keys := keyList(m.MapKeys())
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sort.Sort(keys)
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for _, k := range keys {
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if _, found := sinfo.FieldsMap[k.String()]; found {
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panic(fmt.Sprintf("Can't have key %q in inlined map; conflicts with struct field", k.String()))
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}
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e.marshal("", k)
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e.flow = false
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e.marshal("", m.MapIndex(k))
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}
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}
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}
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})
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}
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func (e *encoder) mappingv(tag string, f func()) {
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implicit := tag == ""
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style := yaml_BLOCK_MAPPING_STYLE
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if e.flow {
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e.flow = false
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style = yaml_FLOW_MAPPING_STYLE
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}
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yaml_mapping_start_event_initialize(&e.event, nil, []byte(tag), implicit, style)
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e.emit()
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f()
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yaml_mapping_end_event_initialize(&e.event)
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e.emit()
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}
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func (e *encoder) slicev(tag string, in reflect.Value) {
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implicit := tag == ""
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style := yaml_BLOCK_SEQUENCE_STYLE
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if e.flow {
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e.flow = false
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style = yaml_FLOW_SEQUENCE_STYLE
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}
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e.must(yaml_sequence_start_event_initialize(&e.event, nil, []byte(tag), implicit, style))
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e.emit()
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n := in.Len()
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for i := 0; i < n; i++ {
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e.marshal("", in.Index(i))
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}
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e.must(yaml_sequence_end_event_initialize(&e.event))
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e.emit()
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}
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// isBase60 returns whether s is in base 60 notation as defined in YAML 1.1.
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//
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// The base 60 float notation in YAML 1.1 is a terrible idea and is unsupported
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// in YAML 1.2 and by this package, but these should be marshalled quoted for
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// the time being for compatibility with other parsers.
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func isBase60Float(s string) (result bool) {
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// Fast path.
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if s == "" {
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return false
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}
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c := s[0]
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if !(c == '+' || c == '-' || c >= '0' && c <= '9') || strings.IndexByte(s, ':') < 0 {
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return false
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}
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// Do the full match.
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return base60float.MatchString(s)
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}
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// From http://yaml.org/type/float.html, except the regular expression there
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// is bogus. In practice parsers do not enforce the "\.[0-9_]*" suffix.
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var base60float = regexp.MustCompile(`^[-+]?[0-9][0-9_]*(?::[0-5]?[0-9])+(?:\.[0-9_]*)?$`)
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func (e *encoder) stringv(tag string, in reflect.Value) {
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var style yaml_scalar_style_t
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s := in.String()
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canUsePlain := true
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switch {
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case !utf8.ValidString(s):
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if tag == yaml_BINARY_TAG {
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failf("explicitly tagged !!binary data must be base64-encoded")
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}
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if tag != "" {
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failf("cannot marshal invalid UTF-8 data as %s", shortTag(tag))
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}
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// It can't be encoded directly as YAML so use a binary tag
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// and encode it as base64.
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tag = yaml_BINARY_TAG
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s = encodeBase64(s)
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case tag == "":
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// Check to see if it would resolve to a specific
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// tag when encoded unquoted. If it doesn't,
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// there's no need to quote it.
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rtag, _ := resolve("", s)
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canUsePlain = rtag == yaml_STR_TAG && !isBase60Float(s)
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}
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// Note: it's possible for user code to emit invalid YAML
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// if they explicitly specify a tag and a string containing
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// text that's incompatible with that tag.
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switch {
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case strings.Contains(s, "\n"):
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style = yaml_LITERAL_SCALAR_STYLE
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case canUsePlain:
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style = yaml_PLAIN_SCALAR_STYLE
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default:
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style = yaml_DOUBLE_QUOTED_SCALAR_STYLE
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}
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e.emitScalar(s, "", tag, style)
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}
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func (e *encoder) boolv(tag string, in reflect.Value) {
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var s string
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if in.Bool() {
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s = "true"
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} else {
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s = "false"
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}
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e.emitScalar(s, "", tag, yaml_PLAIN_SCALAR_STYLE)
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}
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func (e *encoder) intv(tag string, in reflect.Value) {
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s := strconv.FormatInt(in.Int(), 10)
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e.emitScalar(s, "", tag, yaml_PLAIN_SCALAR_STYLE)
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}
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func (e *encoder) uintv(tag string, in reflect.Value) {
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s := strconv.FormatUint(in.Uint(), 10)
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e.emitScalar(s, "", tag, yaml_PLAIN_SCALAR_STYLE)
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}
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func (e *encoder) timev(tag string, in reflect.Value) {
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t := in.Interface().(time.Time)
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s := t.Format(time.RFC3339Nano)
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e.emitScalar(s, "", tag, yaml_PLAIN_SCALAR_STYLE)
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}
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func (e *encoder) floatv(tag string, in reflect.Value) {
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// Issue #352: When formatting, use the precision of the underlying value
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precision := 64
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if in.Kind() == reflect.Float32 {
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precision = 32
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}
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s := strconv.FormatFloat(in.Float(), 'g', -1, precision)
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switch s {
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case "+Inf":
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s = ".inf"
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case "-Inf":
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s = "-.inf"
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case "NaN":
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s = ".nan"
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}
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e.emitScalar(s, "", tag, yaml_PLAIN_SCALAR_STYLE)
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}
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func (e *encoder) nilv() {
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e.emitScalar("null", "", "", yaml_PLAIN_SCALAR_STYLE)
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}
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func (e *encoder) emitScalar(value, anchor, tag string, style yaml_scalar_style_t) {
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implicit := tag == ""
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e.must(yaml_scalar_event_initialize(&e.event, []byte(anchor), []byte(tag), []byte(value), implicit, implicit, style))
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e.emit()
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}
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