72 lines
2.2 KiB
Go
72 lines
2.2 KiB
Go
package configschema
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import (
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"github.com/zclconf/go-cty/cty"
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)
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// EmptyValue returns the "empty value" for the recieving block, which for
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// a block type is a non-null object where all of the attribute values are
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// the empty values of the block's attributes and nested block types.
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//
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// In other words, it returns the value that would be returned if an empty
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// block were decoded against the recieving schema, assuming that no required
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// attribute or block constraints were honored.
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func (b *Block) EmptyValue() cty.Value {
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vals := make(map[string]cty.Value)
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for name, attrS := range b.Attributes {
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vals[name] = attrS.EmptyValue()
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}
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for name, blockS := range b.BlockTypes {
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vals[name] = blockS.EmptyValue()
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}
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return cty.ObjectVal(vals)
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}
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// EmptyValue returns the "empty value" for the receiving attribute, which is
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// the value that would be returned if there were no definition of the attribute
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// at all, ignoring any required constraint.
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func (a *Attribute) EmptyValue() cty.Value {
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if a.NestedType != nil {
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switch a.NestedType.Nesting {
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case NestingList:
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return cty.NullVal(cty.List(a.NestedType.ImpliedType()))
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case NestingSet:
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return cty.NullVal(cty.Set(a.NestedType.ImpliedType()))
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case NestingMap:
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return cty.NullVal(cty.Map(a.NestedType.ImpliedType()))
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default: // NestingSingle, NestingGroup, or no NestingMode
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return cty.NullVal(a.NestedType.ImpliedType())
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}
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}
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return cty.NullVal(a.Type)
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}
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// EmptyValue returns the "empty value" for when there are zero nested blocks
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// present of the receiving type.
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func (b *NestedBlock) EmptyValue() cty.Value {
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switch b.Nesting {
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case NestingSingle:
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return cty.NullVal(b.Block.ImpliedType())
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case NestingGroup:
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return b.Block.EmptyValue()
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case NestingList:
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if ty := b.Block.ImpliedType(); ty.HasDynamicTypes() {
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return cty.EmptyTupleVal
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} else {
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return cty.ListValEmpty(ty)
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}
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case NestingMap:
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if ty := b.Block.ImpliedType(); ty.HasDynamicTypes() {
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return cty.EmptyObjectVal
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} else {
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return cty.MapValEmpty(ty)
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}
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case NestingSet:
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return cty.SetValEmpty(b.Block.ImpliedType())
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default:
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// Should never get here because the above is intended to be exhaustive,
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// but we'll be robust and return a result nonetheless.
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return cty.NullVal(cty.DynamicPseudoType)
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}
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}
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