Initial todo config parser definition

lua/orgmode/parser/todo-config.lua

@@ -0,0 +1,158 @@
+local parsing = require('orgmode.utils.parsing')
+
+--- @class TodoConfig
+--- @field words TodoConfigWord[]
+local TodoConfig = {}
+TodoConfig.__index = TodoConfig
+
+--- @alias TodoConfigRecordBehavior 'time' | 'note' | false
+
+--- @class TodoConfigWord
+--- @field name string
+--- @field is_active boolean
+--- @field hotkey string
+--- @field on_enter TodoConfigRecordBehavior
+--- @field on_leave TodoConfigRecordBehavior
+local TodoConfigWord = {}
+
+--- @param words TodoConfigWord[]
+--- @return TodoConfig
+function TodoConfig:_new(words)
+  --- @type TodoConfig
+  local instance = {}
+  setmetatable(instance, TodoConfig)
+
+  instance.words = words
+
+  return instance
+end
+
+--- @param input string
+--- @return TodoConfig?, string
+function TodoConfig:parse(input)
+  local original = input
+
+  --- @type TodoConfigWord[]
+  local active
+  active, input = parsing.parse_delimited_sequence(input, function(inner_input)
+    return TodoConfigWord:parse(inner_input, true)
+  end, '%s+')
+
+  if #active == 0 then
+    return nil, original
+  end
+
+  local pipe
+  pipe, input = parsing.parse_pattern(input, '%s*%|%s*')
+  if pipe == nil then
+    return nil, original
+  end
+
+  --- @type TodoConfigWord[]
+  local inactive
+  inactive, input = parsing.parse_delimited_sequence(input, function(inner_input)
+    return TodoConfigWord:parse(inner_input, false)
+  end, '%s+')
+
+  if #inactive == 0 then
+    return nil, original
+  end
+
+  --- @type TodoConfigWord[]
+  local words = {}
+  for _, x in ipairs(active) do
+    table.insert(words, x)
+  end
+  for _, x in ipairs(inactive) do
+    table.insert(words, x)
+  end
+
+  return TodoConfig:_new(words), input
+end
+end
+
+--- @param name string
+--- @param hotkey string
+--- @param is_active boolean
+--- @param on_enter TodoConfigRecordBehavior
+--- @param on_leave TodoConfigRecordBehavior
+--- @return TodoConfigWord
+function TodoConfigWord:_new(name, is_active, hotkey, on_enter, on_leave)
+  --- @type TodoConfigWord
+  local instance = {}
+  setmetatable(instance, TodoConfigWord)
+
+  instance.name = name
+  instance.is_active = is_active
+  instance.hotkey = hotkey
+  instance.on_enter = on_enter
+  instance.on_leave = on_leave
+
+  return instance
+end
+
+--- @param input string
+--- @param is_active boolean
+--- @return TodoConfigWord?, string
+function TodoConfigWord:parse(input, is_active)
+  local original = input
+
+  --- @type string?, string?, string?, string?
+  local name, open, hotkey, enter, slash, leave, close
+
+  name, input = parsing.parse_pattern(input, '%w+')
+  if name == nil then
+    return nil, original
+  end
+
+  open, input = parsing.parse_pattern(input, '%(')
+  if open == nil then
+    return nil, original
+  end
+
+  hotkey, input = parsing.parse_pattern(input, '%w')
+  if hotkey == nil then
+    return nil, original
+  end
+
+  ---@type TodoConfigRecordBehavior
+  local on_enter = false
+  enter, input = parsing.parse_pattern_choice(input, '%@', '%!')
+  if enter ~= nil then
+    if enter == '!' then
+      on_enter = 'time'
+    elseif enter == '@' then
+      on_enter = 'note'
+    else
+      return nil, original
+    end
+  end
+
+  --- @type TodoConfigRecordBehavior
+  local on_leave = false
+  slash, input = parsing.parse_pattern(input, '%/')
+  if slash ~= nil then
+    leave, input = parsing.parse_pattern_choice(input, '%@', '%!')
+    if leave == nil then
+      return nil, original
+    end
+
+    if leave == '!' then
+      on_leave = 'time'
+    elseif leave == '@' then
+      on_leave = 'note'
+    else
+      return nil, original
+    end
+  end
+
+  close, input = parsing.parse_pattern(input, '%)')
+  if close == nil then
+    return nil, original
+  end
+
+  local word = TodoConfigWord:_new(name, is_active, hotkey, on_enter, on_leave)
+  return word, input
+end
+
+return TodoConfig