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local M = {}
M.read_methods = {
text = { "read_text" },
buffer = { "read_buffer", "read_window" },
cursor = { "read_cursor" },
mode = { "read_mode", "read_pending_operator" },
selection = { "read_selection" },
count = { "read_count" },
configuration = { "read_configuration", "configuration_present" },
encoding = { "read_encoding" },
macro_state = { "read_macro_state" },
fold_state = { "read_fold_state" },
time = { "read_time_ms" },
highlight_groups = { "read_highlight_group" },
}
M.effect_methods = {
movement = { "apply_cursor", "apply_selection", "set_operator_inclusive" },
configuration = { "write_configuration" },
input = { "read_input" },
folds = { "open_fold" },
prompt = { "show_prompt" },
redraw = { "redraw" },
diagnostics = { "emit_diagnostic" },
highlights = {
"define_highlight_group",
"create_highlight",
"remove_highlight",
},
cursor_presentation = {
"supports_cursor_presentation",
"suppress_cursor_presentation",
"restore_cursor_presentation",
},
timers = { "supports_timers", "start_timer", "stop_timer" },
events = {
"register_events",
"remove_event_registration",
"deliver_event",
"begin_action_transition",
"commit_action_transition",
},
mappings = { "register_action", "register_mapping" },
dot_repeat = { "register_dot_repeat" },
}
local function collect_methods(groups)
local result = {}
local group_names = {}
for group_name in pairs(groups) do
group_names[#group_names + 1] = group_name
end
table.sort(group_names)
for _, group_name in ipairs(group_names) do
for _, method_name in ipairs(groups[group_name]) do
result[#result + 1] = method_name
end
end
return result
end
local all_methods = collect_methods(M.read_methods)
for _, method_name in ipairs(collect_methods(M.effect_methods)) do
all_methods[#all_methods + 1] = method_name
end
table.sort(all_methods)
function M.required_methods()
local result = {}
for index = 1, #all_methods do
result[index] = all_methods[index]
end
return result
end
function M.missing_methods(host)
local missing = {}
for _, method_name in ipairs(all_methods) do
if type(host) ~= "table" or type(host[method_name]) ~= "function" then
missing[#missing + 1] = method_name
end
end
return missing
end
function M.assert_implements(host)
local missing = M.missing_methods(host)
if #missing > 0 then
error("host is missing semantic capabilities: " .. table.concat(missing, ", "), 2)
end
return host
end
local EventQueue = {}
EventQueue.__index = EventQueue
M.EventQueue = EventQueue
function EventQueue.new(deliver)
if type(deliver) ~= "function" then
error("event delivery must be a function", 2)
end
return setmetatable({
_deliver = deliver,
_active_token = nil,
_pending = {},
_next_token = 1,
}, EventQueue)
end
function EventQueue:begin_transition()
if self._active_token ~= nil then
error("an action transition is already active", 2)
end
local token = "action-transition-" .. tostring(self._next_token)
self._next_token = self._next_token + 1
self._active_token = token
self._pending = {}
return token
end
function EventQueue:is_transition_active()
return self._active_token ~= nil
end
function EventQueue:pending_count()
return #self._pending
end
function EventQueue:emit(name, payload)
if type(name) ~= "string" or name == "" then
error("event name must be a nonempty string", 2)
end
if self._active_token ~= nil then
self._pending[#self._pending + 1] = {
name = name,
payload = payload,
}
return false
end
self._deliver(name, payload)
return true
end
function EventQueue:commit_transition(token)
if self._active_token == nil then
error("no action transition is active", 2)
end
if token ~= self._active_token then
error("action transition token does not match", 2)
end
local pending = self._pending
self._active_token = nil
self._pending = {}
for index = 1, #pending do
local event = pending[index]
self._deliver(event.name, event.payload)
end
end
return M
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