27 lines
777 B
Go
27 lines
777 B
Go
package registry
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// An Expr is a type-erased lambda calculus expression. It can have any type of
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// representation, so long as that type is known to the registry it is handled
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// by.
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type Expr interface {
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// Repr returns the name of the underlying representation. Two expressions
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// with the same Repr() are assumed to have the same representation type.
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Repr() string
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// Data returns the underlying expression data.
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Data() any
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}
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// A baseExpr is the default implementation of Expr.
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type baseExpr struct {
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id string
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data any
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}
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func (e baseExpr) Repr() string { return e.id }
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func (e baseExpr) Data() any { return e.data }
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// NewExpr creates an Expr with the given representation name and data.
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func NewExpr(id string, data any) Expr { return baseExpr{id, data} }
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