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destructure.lua
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234 lines (234 loc) · 5.04 KB
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local ntype, mtype, build
do
local _obj_0 = require("moonscript.types")
ntype, mtype, build = _obj_0.ntype, _obj_0.mtype, _obj_0.build
end
local NameProxy
NameProxy = require("moonscript.transform.names").NameProxy
local insert
insert = table.insert
local unpack
unpack = require("moonscript.util").unpack
local user_error
user_error = require("moonscript.errors").user_error
local join
join = function(...)
do
local out = { }
local i = 1
local _list_0 = {
...
}
for _index_0 = 1, #_list_0 do
local tbl = _list_0[_index_0]
for _index_1 = 1, #tbl do
local v = tbl[_index_1]
out[i] = v
i = i + 1
end
end
return out
end
end
local has_destructure
has_destructure = function(names)
for _index_0 = 1, #names do
local n = names[_index_0]
if ntype(n) == "table" then
return true
end
end
return false
end
local extract_assign_names
extract_assign_names = function(name, accum, prefix)
if accum == nil then
accum = { }
end
if prefix == nil then
prefix = { }
end
local i = 1
local _list_0 = name[2]
for _index_0 = 1, #_list_0 do
local tuple = _list_0[_index_0]
local value, suffix
if #tuple == 1 then
local s = {
"index",
{
"number",
i
}
}
i = i + 1
value, suffix = tuple[1], s
else
local key = tuple[1]
local s
if ntype(key) == "key_literal" then
local key_name = key[2]
if ntype(key_name) == "colon" then
s = key_name
else
s = {
"dot",
key_name
}
end
else
s = {
"index",
key
}
end
value, suffix = tuple[2], s
end
suffix = join(prefix, {
suffix
})
local _exp_0 = ntype(value)
if "value" == _exp_0 or "ref" == _exp_0 or "chain" == _exp_0 or "self" == _exp_0 then
insert(accum, {
value,
suffix
})
elseif "table" == _exp_0 then
extract_assign_names(value, accum, suffix)
else
user_error("Can't destructure value of type: " .. tostring(ntype(value)))
end
end
return accum
end
local build_assign
build_assign = function(scope, destruct_literal, receiver)
assert(receiver, "attempting to build destructure assign with no receiver")
local extracted_names = extract_assign_names(destruct_literal)
local names = { }
local values = { }
local inner = {
"assign",
names,
values
}
local obj
if scope:is_local(receiver) or #extracted_names == 1 then
obj = receiver
else
do
obj = NameProxy("obj")
inner = build["do"]({
build.assign_one(obj, receiver),
{
"assign",
names,
values
}
})
obj = obj
end
end
for _index_0 = 1, #extracted_names do
local tuple = extracted_names[_index_0]
insert(names, tuple[1])
local chain
if obj then
chain = NameProxy.chain(obj, unpack(tuple[2]))
else
chain = "nil"
end
insert(values, chain)
end
return build.group({
{
"declare",
names
},
inner
})
end
local split_assign
split_assign = function(scope, assign)
local names, values = unpack(assign, 2)
local g = { }
local total_names = #names
local total_values = #values
local start = 1
for i, n in ipairs(names) do
if ntype(n) == "table" then
if i > start then
local stop = i - 1
insert(g, {
"assign",
(function()
local _accum_0 = { }
local _len_0 = 1
for i = start, stop do
_accum_0[_len_0] = names[i]
_len_0 = _len_0 + 1
end
return _accum_0
end)(),
(function()
local _accum_0 = { }
local _len_0 = 1
for i = start, stop do
_accum_0[_len_0] = values[i]
_len_0 = _len_0 + 1
end
return _accum_0
end)()
})
end
insert(g, build_assign(scope, n, values[i]))
start = i + 1
end
end
if total_names >= start or total_values >= start then
local name_slice
if total_names < start then
name_slice = {
"_"
}
else
do
local _accum_0 = { }
local _len_0 = 1
for i = start, total_names do
_accum_0[_len_0] = names[i]
_len_0 = _len_0 + 1
end
name_slice = _accum_0
end
end
local value_slice
if total_values < start then
value_slice = {
"nil"
}
else
do
local _accum_0 = { }
local _len_0 = 1
for i = start, total_values do
_accum_0[_len_0] = values[i]
_len_0 = _len_0 + 1
end
value_slice = _accum_0
end
end
insert(g, {
"assign",
name_slice,
value_slice
})
end
return build.group(g)
end
return {
has_destructure = has_destructure,
split_assign = split_assign,
build_assign = build_assign,
extract_assign_names = extract_assign_names
}