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Add @.> and @.>>, the broadcast version of @> and @>> #80

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Add @.> and @.>>, the broadcast version of @> and @>> #80

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ngphuoc Jan 26, 2018
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ngphuoc Jan 26, 2018
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ngphuoc Jan 26, 2018
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45 changes: 43 additions & 2 deletions src/macros.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@ using MacroTools

import Base: replace

export @>, @>>, @as, @_, @switch, @or, @dotimes, @oncethen, @defonce, @cond, @with, @errs,
export @>, @.>, @>>, @.>>, @as, @_, @switch, @or, @dotimes, @oncethen, @defonce, @cond, @with, @errs,
@forward, @iter

"""
Expand Down Expand Up @@ -98,6 +98,26 @@ macro >(exs...)
esc(thread(exs...))
end

"""
Same as `@>`, but broadcasts.

@.> x g(y, z) f == f.(g.(x, y, z))

@.> x g f(y, z) == f.(g.(x), y, z)
"""
macro .>(exs...)
thread(x) = isexpr(x, :block) ? thread(rmlines(x).args...) : x

thread(x, ex) =
isexpr(ex, :call, :macrocall) ? Expr(Symbol("."), ex.args[1], Expr(:tuple, x, ex.args[2:end]...)) :
isexpr(ex, :block) ? thread(x, rmlines(ex).args...) :
Expr(:call, ex, x)

thread(x, exs...) = reduce(thread, x, exs)

esc(thread(exs...))
end

"""
Same as `@>`, but threads the last argument.

Expand All @@ -120,6 +140,27 @@ macro >>(exs...)
esc(thread(exs...))
end

"""
Same as `@>>`, but broadcasts.

@.>> x g(y, z) f == f.(g.(y, z, x))

@.>> x g f(y, z) == f.(y, z, g.(x))
"""
macro .>>(exs...)
thread(x) = isexpr(x, :block) ? thread(rmlines(x).args...) : x

thread(x, ex) =
isexpr(ex, Symbol, :->) ? Expr(Symbol("."), ex, Expr(:tuple, x)) :
isexpr(ex, :call, :macrocall) ? Expr(Symbol("."), ex.args[1], Expr(:tuple, ex.args[2:end]..., x)) :
isexpr(ex, :block) ? thread(x, rmlines(ex).args...) :
error("Unsupported expression $ex in @>>")

thread(x, exs...) = reduce(thread, x, exs)

esc(thread(exs...))
end

"""
# @as lets you name the threaded argmument
@as _ x f(_, y) g(z, _) == g(z, f(x, y))
Expand Down Expand Up @@ -322,7 +363,7 @@ export @init

function initm(ex)
quote

if !isdefined(@compat(@__MODULE__), :__inits__)
const $(esc(:__inits__)) = Function[]
end
Expand Down