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Prototype: Headless anonymous function syntax #199

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Prototype: Headless anonymous function syntax #199

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e0a7306
Prototype: Underscores and prefix anonymous function syntax
c42f Feb 17, 2023
c4e0ef5
Make _ always refer to the same (single) argument
c42f Feb 18, 2023
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39 changes: 35 additions & 4 deletions src/expr.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,31 @@ function reorder_parameters!(args, params_pos)
insert!(args, params_pos, pop!(args))
end

function lower_underscores!(anon_args, args, argrange=1:length(args))
for i in argrange
a = args[i]
if a == :_
if isempty(anon_args)
g = gensym()
push!(anon_args, g)
else
g = anon_args[1]
end
args[i] = g
elseif a isa Expr
if Meta.isexpr(a, :call) && length(a.args) > 2 &&
Meta.isexpr(a.args[2], :parameters)
lower_underscores!(anon_args, a.args, 1:1)
lower_underscores!(anon_args, a.args, 3:length(a.args))
lower_underscores!(anon_args, a.args, 2:2)
else
# FIXME: Other out-of-source-order Exprs
lower_underscores!(anon_args, a.args)
end
end
end
end

function _to_expr(node::SyntaxNode; iteration_spec=false, need_linenodes=true,
eq_to_kw=false, map_kw_in_params=false)
if !haschildren(node)
Expand Down Expand Up @@ -250,11 +275,17 @@ function _to_expr(node::SyntaxNode; iteration_spec=false, need_linenodes=true,
# Block for conditional's source location
args[1] = Expr(:block, loc, args[1])
elseif headsym === :(->)
if Meta.isexpr(args[2], :block)
pushfirst!(args[2].args, loc)
if is_prefix_op_call(node)
anon_args = Symbol[]
lower_underscores!(anon_args, args)
pushfirst!(args, Expr(:tuple, anon_args...))
else
# Add block for source locations
args[2] = Expr(:block, loc, args[2])
if Meta.isexpr(args[2], :block)
pushfirst!(args[2].args, loc)
else
# Add block for source locations
args[2] = Expr(:block, loc, args[2])
end
end
elseif headsym === :function
if length(args) > 1
Expand Down
9 changes: 6 additions & 3 deletions src/parser.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -276,7 +276,7 @@ function is_syntactic_operator(k)
end

function is_syntactic_unary_op(k)
kind(k) in KSet"$ & ::"
kind(k) in KSet"$ & :: ->"
end

function is_type_operator(t)
Expand Down Expand Up @@ -1417,6 +1417,7 @@ end
# &a ==> (& a)
# ::a ==> (::-pre a)
# $a ==> ($ a)
# ->a ==> (-> a)
#
# flisp: parse-unary-prefix
function parse_unary_prefix(ps::ParseState)
Expand All @@ -1434,14 +1435,16 @@ function parse_unary_prefix(ps::ParseState)
if k in KSet"& ::"
# &a ==> (& a)
parse_where(ps, parse_call)
elseif k == K"->"
# -> binds loosely on the right
parse_eq_star(ps)
else
# $a ==> ($ a)
# $$a ==> ($ ($ a))
# $&a ==> ($ (& a))
parse_unary_prefix(ps)
end
# Only need PREFIX_OP_FLAG for ::
f = k == K"::" ? PREFIX_OP_FLAG : EMPTY_FLAGS
f = (k == K"::" || k == K"->") ? PREFIX_OP_FLAG : EMPTY_FLAGS
emit(ps, mark, k, f)
end
else
Expand Down