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65 lines
2.2 KiB
Go
65 lines
2.2 KiB
Go
package json
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import (
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"bytes"
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"github.com/zclconf/go-cty/cty"
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"github.com/zclconf/go-cty/cty/convert"
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)
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// Marshal produces a JSON representation of the given value that can later
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// be decoded into a value of the given type.
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//
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// A type is specified separately to allow for the given type to include
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// cty.DynamicPseudoType to represent situations where any type is permitted
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// and so type information must be included to allow recovery of the stored
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// structure when decoding.
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//
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// The given type will also be used to attempt automatic conversions of any
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// non-conformant types in the given value, although this will not always
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// be possible. If the value cannot be made to be conformant then an error is
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// returned, which may be a cty.PathError.
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//
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// Capsule-typed values can be marshalled, but with some caveats. Since
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// capsule values are compared by pointer equality, it is impossible to recover
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// a value that will compare equal to the original value. Additionally,
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// it's not possible to JSON-serialize the capsule type itself, so it's not
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// valid to use capsule types within parts of the value that are conformed to
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// cty.DynamicPseudoType. Otherwise, a capsule value can be used as long as
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// the encapsulated type itself is serializable with the Marshal function
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// in encoding/json.
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func Marshal(val cty.Value, t cty.Type) ([]byte, error) {
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errs := val.Type().TestConformance(t)
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if errs != nil {
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// Attempt a conversion
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var err error
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val, err = convert.Convert(val, t)
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if err != nil {
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return nil, err
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}
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}
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// From this point onward, val can be assumed to be conforming to t.
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buf := &bytes.Buffer{}
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var path cty.Path
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err := marshal(val, t, path, buf)
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if err != nil {
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return nil, err
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}
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return buf.Bytes(), nil
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}
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// Unmarshal decodes a JSON representation of the given value into a cty Value
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// conforming to the given type.
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//
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// While decoding, type conversions will be done where possible to make
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// the result conformant even if the types given in JSON are not exactly
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// correct. If conversion isn't possible then an error is returned, which
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// may be a cty.PathError.
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func Unmarshal(buf []byte, t cty.Type) (cty.Value, error) {
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var path cty.Path
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return unmarshal(buf, t, path)
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}
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