summaryrefslogtreecommitdiff
path: root/lua/clever_f/repeat_resolver.lua
blob: 1b74420d33cc9c508d2ae1bb02a31b0122670eba (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
local domain = require("clever_f.domain")
local sequence_state = require("clever_f.sequence_state")

local M = {}
local RepeatResolver = {}
M.RepeatResolver = RepeatResolver

local resolver_records = setmetatable({}, { __mode = "k" })

local function fail(message, level)
  error(message, (level or 1) + 1)
end

local resolver_metatable = {
  __index = RepeatResolver,
  __newindex = function()
    fail("RepeatResolver values are immutable", 2)
  end,
  __tostring = function()
    return "repeat-resolver"
  end,
  __metatable = "clever_f.repeat_resolver.RepeatResolver",
}

function RepeatResolver.new(options)
  if RepeatResolver.is(options) then
    return options
  end
  if options == nil then
    options = {}
  elseif sequence_state.is(options) then
    options = { state = options }
  elseif type(options) ~= "table" then
    fail("RepeatResolver options must be a table", 2)
  end

  local state = options.state or sequence_state.get()
  if not sequence_state.is(state) then
    fail("RepeatResolver state must be the plugin-global SequenceState", 2)
  end

  local resolver = setmetatable({}, resolver_metatable)
  resolver_records[resolver] = {
    state = state,
  }
  return resolver
end

function RepeatResolver.is(value)
  return type(value) == "table" and resolver_records[value] ~= nil
end

function RepeatResolver:previous_landing(context)
  context = domain.ModeContext.from_full_mode(context)
  return resolver_records[self].state:get_previous_landing(context)
end

function M.new(options)
  return RepeatResolver.new(options)
end

M.landing = function(context, options)
  return RepeatResolver.new(options):previous_landing(context)
end

setmetatable(M, {
  __call = function(_, options)
    return RepeatResolver.new(options)
  end,
})

return M