forked from cadey/xesite
266 lines
6.3 KiB
Go
266 lines
6.3 KiB
Go
package yaml
|
|
|
|
import (
|
|
"reflect"
|
|
"regexp"
|
|
"sort"
|
|
"strconv"
|
|
"strings"
|
|
"time"
|
|
)
|
|
|
|
type encoder struct {
|
|
emitter yaml_emitter_t
|
|
event yaml_event_t
|
|
out []byte
|
|
flow bool
|
|
}
|
|
|
|
func newEncoder() (e *encoder) {
|
|
e = &encoder{}
|
|
e.must(yaml_emitter_initialize(&e.emitter))
|
|
yaml_emitter_set_output_string(&e.emitter, &e.out)
|
|
e.must(yaml_stream_start_event_initialize(&e.event, yaml_UTF8_ENCODING))
|
|
e.emit()
|
|
e.must(yaml_document_start_event_initialize(&e.event, nil, nil, true))
|
|
e.emit()
|
|
return e
|
|
}
|
|
|
|
func (e *encoder) finish() {
|
|
e.must(yaml_document_end_event_initialize(&e.event, true))
|
|
e.emit()
|
|
e.emitter.open_ended = false
|
|
e.must(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.
|
|
if !yaml_emitter_emit(&e.emitter, &e.event) && e.event.typ != yaml_DOCUMENT_END_EVENT && e.event.typ != yaml_STREAM_END_EVENT {
|
|
e.must(false)
|
|
}
|
|
}
|
|
|
|
func (e *encoder) must(ok bool) {
|
|
if !ok {
|
|
msg := e.emitter.problem
|
|
if msg == "" {
|
|
msg = "Unknown problem generating YAML content"
|
|
}
|
|
fail(msg)
|
|
}
|
|
}
|
|
|
|
func (e *encoder) marshal(tag string, in reflect.Value) {
|
|
if !in.IsValid() {
|
|
e.nilv()
|
|
return
|
|
}
|
|
var value interface{}
|
|
if getter, ok := in.Interface().(Getter); ok {
|
|
tag, value = getter.GetYAML()
|
|
tag = longTag(tag)
|
|
if value == nil {
|
|
e.nilv()
|
|
return
|
|
}
|
|
in = reflect.ValueOf(value)
|
|
}
|
|
switch in.Kind() {
|
|
case reflect.Interface:
|
|
if in.IsNil() {
|
|
e.nilv()
|
|
} else {
|
|
e.marshal(tag, in.Elem())
|
|
}
|
|
case reflect.Map:
|
|
e.mapv(tag, in)
|
|
case reflect.Ptr:
|
|
if in.IsNil() {
|
|
e.nilv()
|
|
} else {
|
|
e.marshal(tag, in.Elem())
|
|
}
|
|
case reflect.Struct:
|
|
e.structv(tag, in)
|
|
case reflect.Slice:
|
|
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(in.Interface().(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("Can't 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) 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)
|
|
}
|
|
})
|
|
}
|
|
|
|
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
|
|
}
|
|
e.must(yaml_mapping_start_event_initialize(&e.event, nil, []byte(tag), implicit, style))
|
|
e.emit()
|
|
f()
|
|
e.must(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()
|
|
rtag, rs := resolve("", s)
|
|
if rtag == yaml_BINARY_TAG {
|
|
if tag == "" || tag == yaml_STR_TAG {
|
|
tag = rtag
|
|
s = rs.(string)
|
|
} else if tag == yaml_BINARY_TAG {
|
|
fail("explicitly tagged !!binary data must be base64-encoded")
|
|
} else {
|
|
fail("cannot marshal invalid UTF-8 data as " + shortTag(tag))
|
|
}
|
|
}
|
|
if tag == "" && (rtag != yaml_STR_TAG || isBase60Float(s)) {
|
|
style = yaml_DOUBLE_QUOTED_SCALAR_STYLE
|
|
} else if strings.Contains(s, "\n") {
|
|
style = yaml_LITERAL_SCALAR_STYLE
|
|
} else {
|
|
style = yaml_PLAIN_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) floatv(tag string, in reflect.Value) {
|
|
// FIXME: Handle 64 bits here.
|
|
s := strconv.FormatFloat(float64(in.Float()), 'g', -1, 32)
|
|
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()
|
|
}
|