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