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use "core/metaprogramming.nom"
use "core/text.nom"
use "core/operators.nom"
use "core/collections.nom"
use "core/control_flow.nom"
compile [using %definitions %body, using %definitions do %body] to
%setup_lua <-
Lua ".."
local fell_through = false;
local ok, ret = pcall(function()
\(%definitions as lua statements)
fell_through = true;
end);
%body_lua <-
Lua ".."
local fell_through = false;
local ok, ret = pcall(function()
\(%body as lua statements)
fell_through = true;
end);
remove free vars (declare locals in %setup_lua) from %body_lua
%lua <-
Lua ".."
do
local old_actions, old_compile_actions, old_arg_orders = ACTIONS, COMPILE_ACTIONS, ARG_ORDERS;
ACTIONS = setmetatable({}, {__index=old_actions});
COMPILE_ACTIONS = setmetatable({}, {__index=old_compile_actions});
ARG_ORDERS = setmetatable({}, {__index=old_arg_orders});
\%setup_lua
if not ok then
ACTIONS, COMPILE_ACTIONS, ARG_ORDERS = old_actions, old_compile_actions, old_arg_orders;
error(ret);
end
if not fell_through then
ACTIONS, COMPILE_ACTIONS, ARG_ORDERS = old_actions, old_compile_actions, old_arg_orders;
return ret;
end
getmetatable(ACTIONS).__newindex = old_actions;
getmetatable(COMPILE_ACTIONS).__newindex = old_compile_actions;
getmetatable(ARG_ORDERS).__newindex = old_arg_orders;
\%body_lua
ACTIONS, COMPILE_ACTIONS, ARG_ORDERS = old_actions, old_compile_actions, old_arg_orders;
if not ok then
error(ret);
end
if not fell_through then
return ret;
end
end
declare locals in %lua
return %lua
|
