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package stdlib
import (
"github.com/zclconf/go-cty/cty"
"github.com/zclconf/go-cty/cty/function"
"github.com/zclconf/go-cty/cty/json"
)
var JSONEncodeFunc = function.New(&function.Spec{
Params: []function.Parameter{
{
Name: "val",
Type: cty.DynamicPseudoType,
AllowDynamicType: true,
},
},
Type: function.StaticReturnType(cty.String),
Impl: func(args []cty.Value, retType cty.Type) (cty.Value, error) {
val := args[0]
if !val.IsWhollyKnown() {
// We can't serialize unknowns, so if the value is unknown or
// contains any _nested_ unknowns then our result must be
// unknown.
return cty.UnknownVal(retType), nil
}
buf, err := json.Marshal(val, val.Type())
if err != nil {
return cty.NilVal, err
}
return cty.StringVal(string(buf)), nil
},
})
var JSONDecodeFunc = function.New(&function.Spec{
Params: []function.Parameter{
{
Name: "str",
Type: cty.String,
},
},
Type: func(args []cty.Value) (cty.Type, error) {
str := args[0]
if !str.IsKnown() {
return cty.DynamicPseudoType, nil
}
buf := []byte(str.AsString())
return json.ImpliedType(buf)
},
Impl: func(args []cty.Value, retType cty.Type) (cty.Value, error) {
buf := []byte(args[0].AsString())
return json.Unmarshal(buf, retType)
},
})
// JSONEncode returns a JSON serialization of the given value.
func JSONEncode(val cty.Value) (cty.Value, error) {
return JSONEncodeFunc.Call([]cty.Value{val})
}
// JSONDecode parses the given JSON string and, if it is valid, returns the
// value it represents.
//
// Note that applying JSONDecode to the result of JSONEncode may not produce
// an identically-typed result, since JSON encoding is lossy for cty Types.
// The resulting value will consist only of primitive types, object types, and
// tuple types.
func JSONDecode(str cty.Value) (cty.Value, error) {
return JSONDecodeFunc.Call([]cty.Value{str})
}
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