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65 lines
1.5 KiB
Go
65 lines
1.5 KiB
Go
package cty
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// UnknownAsNull returns a value of the same type as the given value but
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// with any unknown values (including nested values) replaced with null
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// values of the same type.
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//
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// This can be useful if a result is to be serialized in a format that can't
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// represent unknowns, such as JSON, as long as the caller does not need to
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// retain the unknown value information.
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func UnknownAsNull(val Value) Value {
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ty := val.Type()
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switch {
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case val.IsNull():
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return val
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case !val.IsKnown():
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return NullVal(ty)
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case ty.IsListType() || ty.IsTupleType() || ty.IsSetType():
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length := val.LengthInt()
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if length == 0 {
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// If there are no elements then we can't have unknowns
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return val
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}
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vals := make([]Value, 0, length)
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it := val.ElementIterator()
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for it.Next() {
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_, v := it.Element()
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vals = append(vals, UnknownAsNull(v))
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}
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switch {
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case ty.IsListType():
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return ListVal(vals)
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case ty.IsTupleType():
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return TupleVal(vals)
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default:
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return SetVal(vals)
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}
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case ty.IsMapType() || ty.IsObjectType():
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var length int
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switch {
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case ty.IsMapType():
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length = val.LengthInt()
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default:
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length = len(val.Type().AttributeTypes())
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}
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if length == 0 {
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// If there are no elements then we can't have unknowns
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return val
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}
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vals := make(map[string]Value, length)
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it := val.ElementIterator()
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for it.Next() {
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k, v := it.Element()
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vals[k.AsString()] = UnknownAsNull(v)
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}
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switch {
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case ty.IsMapType():
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return MapVal(vals)
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default:
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return ObjectVal(vals)
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}
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}
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return val
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}
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