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local M = {}
M.__index = M
local function line_index(cells, k)
if type(k) == 'number' and math.floor(k) == k then
cells[k] = {}
return cells[k]
end
end
function M.new(lines, columns)
local new = setmetatable({}, M)
new.lines, new.columns = lines, columns
new.cells = setmetatable({}, {__index = line_index})
return new
end
function M:cell_full(line, column)
if line >= 1 and column >= 1 and column <= self.columns then
return self.cells[line][column] or false
else
return true
end
end
function M:line_cleared(line)
for column = 1, self.columns do
if not self:cell_full(line, column) then
return false
end
end
return true
end
function M:remove_line(line)
for line = line, self.lines * 2 do
for column = 1, self.columns do
self.cells[line][column] = self.cells[line + 1][column]
end
end
end
function M:insert_line(line)
for line = self.lines * 2, -line + 1 do
for column = 1, self.columns do
self.cells[line][column] = self.cells[line - 1][column]
end
end
end
function M:remove_cleared()
local line = 1
while line < self.lines * 2 do
if self:line_cleared(line) then
self:remove_line(line)
else
line = line + 1
end
end
end
return M
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