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yaml.go
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yaml.go
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package yttlibrary
import (
"fmt"
"github.com/k14s/ytt/pkg/template/core"
"github.com/k14s/ytt/pkg/yamlmeta"
"go.starlark.net/starlark"
"go.starlark.net/starlarkstruct"
)
var (
YAMLAPI = starlark.StringDict{
"yaml": &starlarkstruct.Module{
Name: "yaml",
Members: starlark.StringDict{
"encode": starlark.NewBuiltin("yaml.encode", core.ErrWrapper(yamlModule{}.Encode)),
"decode": starlark.NewBuiltin("yaml.decode", core.ErrWrapper(yamlModule{}.Decode)),
},
},
}
)
type yamlModule struct{}
func (b yamlModule) Encode(thread *starlark.Thread, f *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
if args.Len() != 1 {
return starlark.None, fmt.Errorf("expected exactly one argument")
}
val := core.NewStarlarkValue(args.Index(0)).AsInterface()
docSet, ok := val.(*yamlmeta.DocumentSet)
if !ok {
docSet = &yamlmeta.DocumentSet{Items: []*yamlmeta.Document{{Value: val}}}
}
valBs, err := docSet.AsBytes()
if err != nil {
return starlark.None, err
}
return starlark.String(string(valBs)), nil
}
func (b yamlModule) Decode(thread *starlark.Thread, f *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
if args.Len() != 1 {
return starlark.None, fmt.Errorf("expected exactly one argument")
}
valEncoded, err := core.NewStarlarkValue(args.Index(0)).AsString()
if err != nil {
return starlark.None, err
}
var valDecoded interface{}
err = yamlmeta.PlainUnmarshal([]byte(valEncoded), &valDecoded)
if err != nil {
return starlark.None, err
}
return core.NewGoValue(valDecoded, false).AsStarlarkValue(), nil
}