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85 lines
2.7 KiB
Go
85 lines
2.7 KiB
Go
package cty
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// unknownType is the placeholder type used for the sigil value representing
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// "Unknown", to make it unambigiously distinct from any other possible value.
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type unknownType struct {
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}
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// unknown is a special value that can be used as the internal value of a
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// Value to create a placeholder for a value that isn't yet known.
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var unknown interface{} = &unknownType{}
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// UnknownVal returns an Value that represents an unknown value of the given
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// type. Unknown values can be used to represent a value that is
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// not yet known. Its meaning is undefined in cty, but it could be used by
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// an calling application to allow partial evaluation.
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//
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// Unknown values of any type can be created of any type. All operations on
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// Unknown values themselves return Unknown.
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func UnknownVal(t Type) Value {
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return Value{
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ty: t,
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v: unknown,
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}
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}
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func (t unknownType) GoString() string {
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// This is the stringification of our internal unknown marker. The
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// stringification of the public representation of unknowns is in
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// Value.GoString.
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return "cty.unknown"
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}
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type pseudoTypeDynamic struct {
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typeImplSigil
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}
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// DynamicPseudoType represents the dynamic pseudo-type.
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//
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// This type can represent situations where a type is not yet known. Its
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// meaning is undefined in cty, but it could be used by a calling
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// application to allow expression type checking with some types not yet known.
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// For example, the application might optimistically permit any operation on
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// values of this type in type checking, allowing a partial type-check result,
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// and then repeat the check when more information is known to get the
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// final, concrete type.
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//
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// It is a pseudo-type because it is used only as a sigil to the calling
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// application. "Unknown" is the only valid value of this pseudo-type, so
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// operations on values of this type will always short-circuit as per
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// the rules for that special value.
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var DynamicPseudoType Type
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func (t pseudoTypeDynamic) Equals(other Type) bool {
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_, ok := other.typeImpl.(pseudoTypeDynamic)
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return ok
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}
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func (t pseudoTypeDynamic) FriendlyName(mode friendlyTypeNameMode) string {
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switch mode {
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case friendlyTypeConstraintName:
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return "any type"
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default:
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return "dynamic"
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}
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}
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func (t pseudoTypeDynamic) GoString() string {
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return "cty.DynamicPseudoType"
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}
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// DynamicVal is the only valid value of the pseudo-type dynamic.
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// This value can be used as a placeholder where a value or expression's
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// type and value are both unknown, thus allowing partial evaluation. See
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// the docs for DynamicPseudoType for more information.
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var DynamicVal Value
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func init() {
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DynamicPseudoType = Type{
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pseudoTypeDynamic{},
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}
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DynamicVal = Value{
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ty: DynamicPseudoType,
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v: unknown,
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}
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}
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