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306 lines
7.3 KiB
306 lines
7.3 KiB
package yaml
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import (
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"encoding"
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"fmt"
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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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)
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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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}
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func newEncoder() (e *encoder) {
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e = &encoder{}
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e.must(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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e.must(yaml_stream_start_event_initialize(&e.event, yaml_UTF8_ENCODING))
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e.emit()
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e.must(yaml_document_start_event_initialize(&e.event, nil, nil, true))
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e.emit()
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return e
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}
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func (e *encoder) finish() {
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e.must(yaml_document_end_event_initialize(&e.event, true))
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e.emit()
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e.emitter.open_ended = false
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e.must(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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if !yaml_emitter_emit(&e.emitter, &e.event) && e.event.typ != yaml_DOCUMENT_END_EVENT && e.event.typ != yaml_STREAM_END_EVENT {
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e.must(false)
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}
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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) marshal(tag string, in reflect.Value) {
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if !in.IsValid() {
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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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if m, ok := iface.(Marshaler); ok {
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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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} else if m, ok := iface.(encoding.TextMarshaler); ok {
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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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}
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switch in.Kind() {
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case reflect.Interface:
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if in.IsNil() {
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e.nilv()
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} else {
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e.marshal(tag, in.Elem())
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}
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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.IsNil() {
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e.nilv()
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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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e.structv(tag, in)
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case reflect.Slice:
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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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e.must(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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e.must(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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rtag, rs := resolve("", s)
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if rtag == yaml_BINARY_TAG {
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if tag == "" || tag == yaml_STR_TAG {
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tag = rtag
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s = rs.(string)
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} else if tag == yaml_BINARY_TAG {
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failf("explicitly tagged !!binary data must be base64-encoded")
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} else {
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failf("cannot marshal invalid UTF-8 data as %s", shortTag(tag))
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}
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}
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if tag == "" && (rtag != yaml_STR_TAG || isBase60Float(s)) {
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style = yaml_DOUBLE_QUOTED_SCALAR_STYLE
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} else if strings.Contains(s, "\n") {
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style = yaml_LITERAL_SCALAR_STYLE
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} else {
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style = yaml_PLAIN_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) floatv(tag string, in reflect.Value) {
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// FIXME: Handle 64 bits here.
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s := strconv.FormatFloat(float64(in.Float()), 'g', -1, 32)
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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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