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|
package yaml
import (
"bytes"
"fmt"
"strings"
"github.com/zclconf/go-cty/cty"
)
func (c *Converter) marshal(v cty.Value) ([]byte, error) {
var buf bytes.Buffer
e := &yaml_emitter_t{}
yaml_emitter_initialize(e)
yaml_emitter_set_output_writer(e, &buf)
yaml_emitter_set_unicode(e, true)
var evt yaml_event_t
yaml_stream_start_event_initialize(&evt, yaml_UTF8_ENCODING)
if !yaml_emitter_emit(e, &evt) {
return nil, emitterError(e)
}
yaml_document_start_event_initialize(&evt, nil, nil, true)
if !yaml_emitter_emit(e, &evt) {
return nil, emitterError(e)
}
if err := c.marshalEmit(v, e); err != nil {
return nil, err
}
yaml_document_end_event_initialize(&evt, true)
if !yaml_emitter_emit(e, &evt) {
return nil, emitterError(e)
}
yaml_stream_end_event_initialize(&evt)
if !yaml_emitter_emit(e, &evt) {
return nil, emitterError(e)
}
return buf.Bytes(), nil
}
func (c *Converter) marshalEmit(v cty.Value, e *yaml_emitter_t) error {
ty := v.Type()
switch {
case v.IsNull():
return c.marshalPrimitive(v, e)
case !v.IsKnown():
return fmt.Errorf("cannot serialize unknown value as YAML")
case ty.IsPrimitiveType():
return c.marshalPrimitive(v, e)
case ty.IsTupleType(), ty.IsListType(), ty.IsSetType():
return c.marshalSequence(v, e)
case ty.IsObjectType(), ty.IsMapType():
return c.marshalMapping(v, e)
default:
return fmt.Errorf("can't marshal %s as YAML", ty.FriendlyName())
}
}
func (c *Converter) marshalPrimitive(v cty.Value, e *yaml_emitter_t) error {
var evt yaml_event_t
if v.IsNull() {
yaml_scalar_event_initialize(
&evt,
nil,
nil,
[]byte("null"),
true,
true,
yaml_PLAIN_SCALAR_STYLE,
)
if !yaml_emitter_emit(e, &evt) {
return emitterError(e)
}
return nil
}
switch v.Type() {
case cty.String:
str := v.AsString()
style := yaml_DOUBLE_QUOTED_SCALAR_STYLE
if strings.Contains(str, "\n") {
style = yaml_LITERAL_SCALAR_STYLE
}
yaml_scalar_event_initialize(
&evt,
nil,
nil,
[]byte(str),
true,
true,
style,
)
case cty.Number:
str := v.AsBigFloat().Text('f', -1)
yaml_scalar_event_initialize(
&evt,
nil,
nil,
[]byte(str),
true,
true,
yaml_PLAIN_SCALAR_STYLE,
)
case cty.Bool:
var str string
switch v {
case cty.True:
str = "true"
case cty.False:
str = "false"
}
yaml_scalar_event_initialize(
&evt,
nil,
nil,
[]byte(str),
true,
true,
yaml_PLAIN_SCALAR_STYLE,
)
}
if !yaml_emitter_emit(e, &evt) {
return emitterError(e)
}
return nil
}
func (c *Converter) marshalSequence(v cty.Value, e *yaml_emitter_t) error {
style := yaml_BLOCK_SEQUENCE_STYLE
if c.encodeAsFlow {
style = yaml_FLOW_SEQUENCE_STYLE
}
var evt yaml_event_t
yaml_sequence_start_event_initialize(&evt, nil, nil, true, style)
if !yaml_emitter_emit(e, &evt) {
return emitterError(e)
}
for it := v.ElementIterator(); it.Next(); {
_, v := it.Element()
err := c.marshalEmit(v, e)
if err != nil {
return err
}
}
yaml_sequence_end_event_initialize(&evt)
if !yaml_emitter_emit(e, &evt) {
return emitterError(e)
}
return nil
}
func (c *Converter) marshalMapping(v cty.Value, e *yaml_emitter_t) error {
style := yaml_BLOCK_MAPPING_STYLE
if c.encodeAsFlow {
style = yaml_FLOW_MAPPING_STYLE
}
var evt yaml_event_t
yaml_mapping_start_event_initialize(&evt, nil, nil, true, style)
if !yaml_emitter_emit(e, &evt) {
return emitterError(e)
}
for it := v.ElementIterator(); it.Next(); {
k, v := it.Element()
err := c.marshalEmit(k, e)
if err != nil {
return err
}
err = c.marshalEmit(v, e)
if err != nil {
return err
}
}
yaml_mapping_end_event_initialize(&evt)
if !yaml_emitter_emit(e, &evt) {
return emitterError(e)
}
return nil
}
|
