8783bea06e
* feat: quickfix (not implemented) * [WIP]: Wed 09 Dec 2020 11:11:30 PM EST * somewhat working linked list impl * getting closer * might be working * might be working for real * works and implemented basic example * dont forget to close prompt * fix descending and add more tests * test fixes * fix test * more logging * Fix some more tests * Fix logging messing up tests * fix: lint * fix: multi select stuffs
77 lines
1.8 KiB
Lua
77 lines
1.8 KiB
Lua
local scroller = {}
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local range_calculators = {
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ascending = function(max_results, num_results)
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return 0, math.min(max_results, num_results)
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end,
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descending = function(max_results, num_results)
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return math.max(max_results - num_results, 0), max_results
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end,
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}
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local scroll_calculators = {
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cycle = function(range_fn)
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return function(max_results, num_results, row)
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local start, finish = range_fn(max_results, num_results)
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if row >= finish then
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return start
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elseif row < start then
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return finish - 1
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end
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return row
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end
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end,
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limit = function(range_fn)
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return function(max_results, num_results, row)
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local start, finish = range_fn(max_results, num_results)
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if row >= finish then
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return finish - 1
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elseif row < start then
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return start
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end
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return row
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end
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end,
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}
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scroller.create = function(scroll_strategy, sorting_strategy)
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local range_fn = range_calculators[sorting_strategy]
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if not range_fn then
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error(debug.traceback("Unknown sorting strategy: " .. sorting_strategy))
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end
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local scroll_fn = scroll_calculators[scroll_strategy]
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if not scroll_fn then
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error(debug.traceback("Unknown scroll strategy: " .. (scroll_strategy or '')))
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end
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local calculator = scroll_fn(range_fn)
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return function(max_results, num_results, row)
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local result = calculator(max_results, num_results, row)
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if result < 0 then
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error(string.format(
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"Must never return a negative row: { result = %s, args = { %s %s %s } }",
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result, max_results, num_results, row
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))
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end
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if result >= max_results then
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error(string.format(
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"Must never exceed max results: { result = %s, args = { %s %s %s } }",
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result, max_results, num_results, row
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))
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end
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return result
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end
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end
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return scroller
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