зеркало из https://github.com/go-gitea/yaml.git
217 строки
4.8 KiB
Go
217 строки
4.8 KiB
Go
package goyaml
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import (
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"reflect"
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"sort"
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"strconv"
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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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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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panic(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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var value interface{}
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if getter, ok := in.Interface().(Getter); ok {
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tag, value = getter.GetYAML()
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if value == nil {
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e.nilv()
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return
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}
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in = reflect.ValueOf(value)
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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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e.slicev(tag, in)
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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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e.intv(tag, in)
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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("Can't marshal type yet: " + 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) structv(tag string, in reflect.Value) {
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fields, err := getStructFields(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 fields.List {
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value := in.Field(info.Num)
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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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})
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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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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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if rtag, _ := resolve("", s); rtag != "!!str" {
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style = yaml_DOUBLE_QUOTED_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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if !implicit {
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style = yaml_PLAIN_SCALAR_STYLE
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}
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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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