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local domain = require("clever_f.domain")
local M = {}
local SequenceCoordinator = {}
SequenceCoordinator.__index = SequenceCoordinator
M.SequenceCoordinator = SequenceCoordinator
local coordinator_records = setmetatable({}, { __mode = "k" })
local function fail(message, level)
error(message, (level or 1) + 1)
end
local function descriptor_text(value)
if domain.Descriptor.is(value) then
return value.value
end
return tostring(value)
end
function M.validate_primary_descriptor(value)
local descriptor = domain.Descriptor.try_from_string(value)
if descriptor == nil then
fail("clever-f: Invalid mapping '" .. descriptor_text(value) .. "'", 2)
end
return descriptor
end
function SequenceCoordinator.new(options)
if SequenceCoordinator.is(options) then
return options
end
if type(options) ~= "table" then
fail("SequenceCoordinator options must be a table", 2)
end
local coordinator = setmetatable({}, SequenceCoordinator)
coordinator_records[coordinator] = {
host = options.host or options,
}
return coordinator
end
function SequenceCoordinator.is(value)
return type(value) == "table" and coordinator_records[value] ~= nil
end
function SequenceCoordinator:validate_primary_descriptor(value)
return M.validate_primary_descriptor(value)
end
local function require_primary_reader(host)
if type(host) ~= "table"
or type(host.read_mode) ~= "function"
or type(host.read_cursor) ~= "function"
or type(host.read_count) ~= "function"
or type(host.read_macro_state) ~= "function"
then
fail("SequenceCoordinator host must provide primary action state", 3)
end
return host
end
function SequenceCoordinator:read_primary_invocation()
local host = require_primary_reader(coordinator_records[self].host)
local context = domain.ModeContext.from_full_mode(host:read_mode())
local position = domain.Position.coerce(host:read_cursor())
local count = domain.Count.new(host:read_count())
local macro_state = domain.MacroState.new(host:read_macro_state())
return {
context = context,
position = position,
origin = position,
count = count,
macro_state = macro_state,
}
end
function SequenceCoordinator:inspect_fold_open_policy(invocation)
if type(invocation) ~= "table" or not domain.Position.is(invocation.position) then
fail("fold preflight requires primary invocation state", 2)
end
local host = coordinator_records[self].host
if type(host.read_fold_state) ~= "function" then
fail("SequenceCoordinator host must provide fold state", 2)
end
local fold_state = host:read_fold_state()
if not domain.FoldState.is(fold_state) then
fail("SequenceCoordinator host must return FoldState", 2)
end
return fold_state
end
local function fold_open_enabled(fold_state)
return fold_state:opens("horizontal") or fold_state:opens("all")
end
function SequenceCoordinator:open_enclosing_folds(invocation, fold_state)
if type(invocation) ~= "table" or not domain.Position.is(invocation.position) then
fail("fold opening requires primary invocation state", 2)
end
if not domain.FoldState.is(fold_state) then
fail("fold opening requires FoldState", 2)
end
if not fold_open_enabled(fold_state) then
return 0
end
local host = coordinator_records[self].host
if type(host.open_fold) ~= "function" then
fail("SequenceCoordinator host must open folds", 2)
end
local opened = 0
while fold_state.closed_levels > 0 do
if host:open_fold(invocation.position) ~= true then
break
end
opened = opened + 1
fold_state = self:inspect_fold_open_policy(invocation)
end
return opened
end
function SequenceCoordinator:primary(value)
local descriptor = self:validate_primary_descriptor(value)
local invocation = self:read_primary_invocation()
invocation.fold_state = self:inspect_fold_open_policy(invocation)
invocation.opened_folds = self:open_enclosing_folds(
invocation,
invocation.fold_state
)
return descriptor
end
function M.new(options)
return SequenceCoordinator.new(options)
end
setmetatable(M, {
__call = function(_, options)
return SequenceCoordinator.new(options)
end,
})
return M
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