/
list_type.go
74 lines (64 loc) · 1.71 KB
/
list_type.go
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package cty
import (
"fmt"
)
// TypeList instances represent specific list types. Each distinct ElementType
// creates a distinct, non-equal list type.
type typeList struct {
typeImplSigil
ElementTypeT Type
}
// List creates a map type with the given element Type.
//
// List types are CollectionType implementations.
func List(elem Type) Type {
return Type{
typeList{
ElementTypeT: elem,
},
}
}
// Equals returns true if the other Type is a list whose element type is
// equal to that of the receiver.
func (t typeList) Equals(other Type) bool {
ot, isList := other.typeImpl.(typeList)
if !isList {
return false
}
return t.ElementTypeT.Equals(ot.ElementTypeT)
}
func (t typeList) FriendlyName(mode friendlyTypeNameMode) string {
elemName := t.ElementTypeT.friendlyNameMode(mode)
if mode == friendlyTypeConstraintName {
if t.ElementTypeT == DynamicPseudoType {
elemName = "any single type"
}
}
return "list of " + elemName
}
func (t typeList) ElementType() Type {
return t.ElementTypeT
}
func (t typeList) GoString() string {
return fmt.Sprintf("cty.List(%#v)", t.ElementTypeT)
}
// IsListType returns true if the given type is a list type, regardless of its
// element type.
func (t Type) IsListType() bool {
_, ok := t.typeImpl.(typeList)
return ok
}
// ListElementType is a convenience method that checks if the given type is
// a list type, returning a pointer to its element type if so and nil
// otherwise. This is intended to allow convenient conditional branches,
// like so:
//
// if et := t.ListElementType(); et != nil {
// // Do something with *et
// }
func (t Type) ListElementType() *Type {
if lt, ok := t.typeImpl.(typeList); ok {
return <.ElementTypeT
}
return nil
}