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RFC/WIP: Lower AST using an external package (GroundEffects.jl) #68

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RFC/WIP: Lower AST using an external package (GroundEffects.jl) #68

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1 change: 1 addition & 0 deletions Project.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@ version = "0.12.1"

[deps]
FillArrays = "1a297f60-69ca-5386-bcde-b61e274b549b"
GroundEffects = "d00d4687-65cd-4fba-8fd9-ecb45a036ebe"
LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
MacroTools = "1914dd2f-81c6-5fcd-8719-6d5c9610ff09"
StaticArrays = "90137ffa-7385-5640-81b9-e52037218182"
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13 changes: 7 additions & 6 deletions src/lazymacro.jl
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Expand Up @@ -4,6 +4,7 @@
# and @chethega https://github.com/JuliaLang/julia/pull/30939

using MacroTools
using GroundEffects

lazy(::Any) = throw(ArgumentError("function `lazy` exists only for its effect on broadcasting, see the macro @~"))
struct LazyCast{T}
Expand All @@ -13,12 +14,11 @@ Broadcast.broadcasted(::typeof(lazy), x) = LazyCast(x)
Broadcast.materialize(x::LazyCast) = x.value


is_call(ex::Expr) =
ex.head == :call && !startswith(String(ex.args[1]), ".")
is_call(ex) = isexpr(ex, :call) && !is_dotcall(ex)

is_dotcall(ex::Expr) =
(ex.head == :. && ex.args[2].head === :tuple) ||
(ex.head == :call && startswith(String(ex.args[1]), "."))
is_dotcall(ex) =
(isexpr(ex, :.) && ex.args[2].head === :tuple) ||
(isexpr(ex, :call) && ex.args[1] isa Symbol && startswith(String(ex.args[1]), "."))
# e.g., `f.(x, y, z)` or `x .+ y .+ z`

lazy_expr(x) = x
Expand Down Expand Up @@ -105,5 +105,6 @@ julia> @~ A * B + C
macro ~(ex)
checkex(ex)
# Expanding macro here to support, e.g., `@.`
esc(:($instantiate($(lazy_expr(macroexpand(__module__, ex))))))
lex = lazy_expr(GroundEffects.lower(macroexpand(__module__, ex)))
esc(:($instantiate($lex)))
end