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Allow for proposed new parsing of array[end] in Accessors #196

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Merged
merged 3 commits into from
Feb 19, 2025
Merged

Allow for proposed new parsing of array[end] in Accessors #196

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19aedfd
Allow for proposed new parsing of `array[end]` in Accessors
mlechu Feb 18, 2025
782a965
Update src/sugar.jl
aplavin Feb 19, 2025
226892e
Make lower_index nicer
mlechu Feb 19, 2025
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17 changes: 8 additions & 9 deletions src/sugar.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -141,20 +141,19 @@ foldtree(op, init, ex::Expr) =

need_dynamic_optic(ex) =
foldtree(false, ex) do yes, x
yes || x === :end || (x === :begin) || x === :_
yes || x ∈ (:end, :begin, Expr(:end), Expr(:begin), :_)
end

replace_underscore(ex, to) = postwalk(x -> x === :_ ? to : x, ex)

function lower_index(collection::Symbol, index, dim)
index = MacroTools.replace(
index, :end,
dim === nothing ? :($(Base.lastindex)($collection)) : :($(Base.lastindex)($collection, $dim))
)
index = MacroTools.replace(
index, :begin,
dim === nothing ? :($(Base.firstindex)($collection)) : :($(Base.firstindex)($collection, $dim))
)
lasti = dim === nothing ? :($(Base.lastindex)($collection)) : :($(Base.lastindex)($collection, $dim))
firsti = dim === nothing ? :($(Base.firstindex)($collection)) : :($(Base.firstindex)($collection, $dim))
index = MacroTools.replace(index, :end, lasti)
index = MacroTools.replace(index, :begin, firsti)
# New syntax for begin/end in indexing expression, see https://github.com/JuliaLang/julia/pull/57368
index = MacroTools.replace(index, Expr(:end), lasti)
index = MacroTools.replace(index, Expr(:begin), firsti)
end

_secondarg(_, x) = x
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