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feat: lambda expressions are mutable now

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Maxim Hutz
2026-02-09 19:52:09 -05:00
parent 08bf248745
commit 9d44f5433c
8 changed files with 67 additions and 98 deletions
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16
pkg/engine/normalorder/reduce_once.go
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@@ -10,25 +10,25 @@ import "git.maximhutz.com/max/lambda/pkg/lambda"
func ReduceOnce(e lambda.Expression) (lambda.Expression, bool) {
switch e := e.(type) {
case lambda.Abstraction:
body, reduced := ReduceOnce(e.Body())
body, reduced := ReduceOnce(e.Body)
if reduced {
return lambda.NewAbstraction(e.Parameter(), body), true
return lambda.Abstraction{Parameter: e.Parameter, Body: body}, true
}
return e, false
case lambda.Application:
if fn, fnOk := e.Abstraction().(lambda.Abstraction); fnOk {
return fn.Body().Substitute(fn.Parameter(), e.Argument()), true
if fn, fnOk := e.Abstraction.(lambda.Abstraction); fnOk {
return fn.Body.Substitute(fn.Parameter, e.Argument), true
}
abs, reduced := ReduceOnce(e.Abstraction())
abs, reduced := ReduceOnce(e.Abstraction)
if reduced {
return lambda.NewApplication(abs, e.Argument()), true
return lambda.Application{Abstraction: abs, Argument: e.Argument}, true
}
arg, reduced := ReduceOnce(e.Argument())
arg, reduced := ReduceOnce(e.Argument)
if reduced {
return lambda.NewApplication(e.Abstraction(), arg), true
return lambda.Application{Abstraction: e.Abstraction, Argument: arg}, true
}
return e, false