Factorio / calculator-ui

  -- calculator.lua
  
  -- ----------------------------------------------------------------
  local function get_gui_root(player)
  	return player.gui.screen
  end
  
  -- ----------------------------------------------------------------

  function show_think(player, enabled) 
  	local root = get_gui_root(player)
  	
  	if enabled then
  		root.calcui.calcui_table.calcui_table_col2.calcui_rant.sprite = "sprite_calcui_think"
  		root.calcui.calcui_table.calcui_table_col2.calcui_scroll_pane.style.height = 196
  	else
  		root.calcui.calcui_table.calcui_table_col2.calcui_rant.sprite = nil
  		root.calcui.calcui_table.calcui_table_col2.calcui_scroll_pane.style.height = 252
  	end
  end
  
  -- ----------------------------------------------------------------

  function show_rant(player, enabled) 
  	local root = get_gui_root(player)
  	
  	if enabled then
  		root.calcui.calcui_table.calcui_table_col2.calcui_rant.sprite = "sprite_calcui_rant"
  		root.calcui.calcui_table.calcui_table_col2.calcui_scroll_pane.style.height = 196
  	else
  		root.calcui.calcui_table.calcui_table_col2.calcui_rant.sprite = nil
  		root.calcui.calcui_table.calcui_table_col2.calcui_scroll_pane.style.height = 252
  	end
  end
  
  -- ----------------------------------------------------------------
  local function destroy_calculator(player)
  	local root = get_gui_root(player)
  	if root.calcui then
  		root.calcui.destroy()
  	end
  end
  
  -- ----------------------------------------------------------------
  function show_calculator(player)
  	local root = get_gui_root(player)

  	if not root.calcui then
  		local calcui = root.add({
  			type = "frame", 
  			name = "calcui", 
  			style = "dialog_frame",
  			direction = "vertical"
  		})
  		
  		local flow = calcui.add({
  			type = "flow", 
  			name = "calcui_flow"
  		})
  		flow.style.horizontally_stretchable = "on"
  		
  		flow.add({
  			type = "label", 
  			caption = {"calculator-ui.title"}, 
  			style = "frame_title"
  		}).drag_target = calcui
  		
  		local widget = flow.add({
  			type = "empty-widget",
  			style = "draggable_space_header",
  			name = "calcui_drag"
  		})
  		widget.drag_target = calcui
  		widget.style.horizontally_stretchable = "on"
  		widget.style.minimal_width = 24
  		widget.style.natural_height = 24
  		
  		flow.add({
  			type = "sprite-button", 
  			sprite = "utility/close_white", 
  			style = "frame_action_button", 
  			name = "calcui_close"
  		})
  		
  		local table = calcui.add({
  			type = "table", 
  			name = "calcui_table", 
  			column_count = "2", 
  			vertical_centering = "false"
  		})
  		
  		local col1 = table.add({
  			type = "flow", 
  			name = "calcui_table_col1", 
  			direction = "vertical"
  		})
  		
  		local display = col1.add({
  			type = "textfield", 

  			caption = "", 
  			name = "calcui_display"
  		})

  		display.style.width = 212

  		local row1 = col1.add({type="flow", name="calcui_col1_row1", direction="horizontal"})

  		row1.add({type="sprite-button", style="calcui_button_style_light", caption="CE", name="calcui_button_CE"}).sprite = "sprite_calcui_light"		-- CE = Clear Entry (just this line)
  		row1.add({type="sprite-button", style="calcui_button_style_light", caption="C",  name="calcui_button_C"}).sprite = "sprite_calcui_light"		-- C  = Clear (all, past results as well)
  		row1.add({type="sprite-button", style="calcui_button_style_light", caption="BS", name="calcui_button_BS"}).sprite = "sprite_calcui_light"
  		row1.add({type="sprite-button", style="calcui_button_style_light", caption="/",  name="calcui_button_DIV"}).sprite = "sprite_calcui_light"

  		local row2 = col1.add({type="flow", name="calcui_col1_row2", direction="horizontal"})

  		row2.add({type="sprite-button", style="calcui_button_style_dark",  caption="7",  name="calcui_button_7"}).sprite = "sprite_calcui_dark"
  		row2.add({type="sprite-button", style="calcui_button_style_dark",  caption="8",  name="calcui_button_8"}).sprite = "sprite_calcui_dark"
  		row2.add({type="sprite-button", style="calcui_button_style_dark",  caption="9",  name="calcui_button_9"}).sprite = "sprite_calcui_dark"
  		row2.add({type="sprite-button", style="calcui_button_style_light", caption="*",  name="calcui_button_MUL"}).sprite = "sprite_calcui_light"

  		local row3 = col1.add({type="flow", name="calcui_col1_row3", direction="horizontal"})

  		row3.add({type="sprite-button", style="calcui_button_style_dark",  caption="4",  name="calcui_button_4"}).sprite = "sprite_calcui_dark"
  		row3.add({type="sprite-button", style="calcui_button_style_dark",  caption="5",  name="calcui_button_5"}).sprite = "sprite_calcui_dark"
  		row3.add({type="sprite-button", style="calcui_button_style_dark",  caption="6",  name="calcui_button_6"}).sprite = "sprite_calcui_dark"
  		row3.add({type="sprite-button", style="calcui_button_style_light", caption="-",  name="calcui_button_SUB"}).sprite = "sprite_calcui_light"

  		local row4 = col1.add({type="flow", name="calcui_col1_row4", direction="horizontal"})

  		row4.add({type="sprite-button", style="calcui_button_style_dark",  caption="1",  name="calcui_button_1"}).sprite = "sprite_calcui_dark"
  		row4.add({type="sprite-button", style="calcui_button_style_dark",  caption="2",  name="calcui_button_2"}).sprite = "sprite_calcui_dark"
  		row4.add({type="sprite-button", style="calcui_button_style_dark",  caption="3",  name="calcui_button_3"}).sprite = "sprite_calcui_dark"
  		row4.add({type="sprite-button", style="calcui_button_style_light", caption="+",  name="calcui_button_ADD"}).sprite = "sprite_calcui_light"

  		local row5 = col1.add({type="flow", name="calcui_col1_row5", direction="horizontal"})

  		row5.add({type="sprite-button", style="calcui_button_style_light", caption="%",  name="calcui_button_PERC"}).sprite = "sprite_calcui_light"
  		row5.add({type="sprite-button", style="calcui_button_style_dark",  caption="0",  name="calcui_button_0"}).sprite = "sprite_calcui_dark"
  		row5.add({type="sprite-button", style="calcui_button_style_dark",  caption=".",  name="calcui_button_DOT"}).sprite = "sprite_calcui_dark"
  		row5.add({type="sprite-button", style="calcui_button_style_red",   caption="=",  name="calcui_button_EQU"}).sprite = "sprite_calcui_red"

  		--.sprite = "sprite_calcui_dark"

  		local col2 = table.add({
  			type = "flow", 
  			name = "calcui_table_col2", 
  			direction = "vertical"
  		})
  
  		local result = col2.add({
  			type = "label", 
  			caption = "= ", 
  			name = "calcui_display_result"
  		})
  		result.style.font = "default-large"
  		
  		local rant = col2.add({
  			type = "sprite",
  			name = "calcui_rant"
  		})
  		
  		col2.add({
  			type = "line", 
  			direction = "horizontal"
  		})
  		
  		local scroll = col2.add({
  			type = "scroll-pane",
  			name = "calcui_scroll_pane"
  		})
  		scroll.style.height = 252
  		
  		local recents = scroll.add({
  			type = "table", 
  			caption = "", 
  			name = "calcui_result_table", 
  			column_count = "2"
  		})
  		recents.style.column_alignments[1] = "right"
  		
  		
  		-- center the gui
  		calcui.force_auto_center()
  	end

  end
  
  -- ----------------------------------------------------------------
  function hide_calculator(player)
  	destroy_calculator(player)
  end
  
  -- ----------------------------------------------------------------
  function toggle_calculator(player)
  	local root = get_gui_root(player)
  	if root and root.calcui then
  		hide_calculator(player)
  	else
  		show_calculator(player)
  	end
  end
  
  -- ----------------------------------------------------------------

  function focus_on_input(player)
  	local root = get_gui_root(player)
  	root.calcui.calcui_table.calcui_table_col1.calcui_display.focus()
  end
  
  -- ----------------------------------------------------------------

  function clear_equation(player)
  	local root = get_gui_root(player)
  	root.calcui.calcui_table.calcui_table_col1.calcui_display.text = ""
  end
  
  -- ----------------------------------------------------------------
  function process_ce_key(player, button)
  	local root = get_gui_root(player)
  	clear_equation(player)
  	root.calcui.calcui_table.calcui_table_col2.calcui_display_result.caption = "="

  	root.calcui.calcui_table.calcui_table_col2.calcui_display_result.tooltip = ""

  end
  
  -- ----------------------------------------------------------------
  function process_c_key(player, button)
  	local root = get_gui_root(player)
  	process_ce_key(player, button)
  	root.calcui.calcui_table.calcui_table_col2.calcui_scroll_pane.calcui_result_table.clear()
  end
  
  -- ----------------------------------------------------------------
  function process_backspace_key(player, button)
  	local root = get_gui_root(player)
  	root.calcui.calcui_table.calcui_table_col1.calcui_display.text = string.sub(root.calcui.calcui_table.calcui_table_col1.calcui_display.text, 1, -2)
  end
  
  -- ----------------------------------------------------------------

  function fix_equation(equation, root)

  	local result = equation

  	local prev_result = root.calcui.calcui_table.calcui_table_col2.calcui_display_result.tooltip
  
  
  	-- 1. visible part
  	-- if equation does not start with a number or char, use the previous result (if available) and put it in front
  	if not (string.match(result:sub(1, 1), "[^%w%(%)]") == nil) and prev_result then
  		result = prev_result .. result
  	end
  
  	-- remove "math."
  	result = result:gsub("math.", "")
  	local new_equation = result
  
  
  	-- 2. invisible part

  	-- fix math library shortcuts
  	local math_lib = {
  		["abs"]   = "math.abs",
  		["acos"]  = "math.acos",
  		["asin"]  = "math.asin",
  		["atan"]  = "math.atan",

  		["atan2"] = "math.atan2",

  		["ceil"]  = "math.ceil",
  		["floor"] = "math.floor",
  		["cos"]   = "math.cos",

  		["cosh"]  = "math.cosh",

  		["sin"]   = "math.sin",

  		["sinh"]  = "math.sinh",

  		["tan"]   = "math.tan",

  		["tanh"]  = "math.tanh",

  		["deg"]   = "math.deg",
  		["rad"]   = "math.rad",

  		["exp"]   = "math.exp",
  		["log"]   = "math.log",

  		["log10"] = "math.log10",

  		["min"]   = "math.min",
  		["max"]   = "math.max",
  		["modf"]  = "math.modf",

  		["fmod"]  = "math.fmod",
  		["frexp"] = "math.frexp",
  		["ldexp"] = "math.ldexp",

  		["sqrt"]  = "math.sqrt",
  		["huge"]  = "math.huge",

  		["pi"]    = "math.pi",
  		["pow"]   = "math.pow"

  	}
  	for key, val in pairs(math_lib) do
  		result = result:gsub(key, val)
  	end
  
  	-- fix percentage
  	result = result:gsub("(%%)", "/100")
  	

  	-- fix danish keyboard
  	result = result:gsub(",", ".")

  	result = result:gsub(";", ",")

  
  	return result, new_equation

  end
  
  -- ----------------------------------------------------------------
  function process_equal_key(player, button)
  	local root = get_gui_root(player)

  	local original_equation = root.calcui.calcui_table.calcui_table_col1.calcui_display.text;
  	

  	equation, original_equation = fix_equation(original_equation, root)

  	
  	-- just testing
  	--root.calcui.calcui_table.calcui_table_col1.calcui_display.text = equation
  	
  	if not (equation == nil or equation == "") then
  		local status, retval = pcall(function()
  			return load("return " .. equation)()
  		end)
  		root.calcui.calcui_table.calcui_table_col2.calcui_display_result.tooltip = retval

  		if not (retval == math.huge or retval ~= retval) then
  			status, retval_show = pcall(function()
  				local result = string.format("%0." .. settings.get_player_settings(player)["calcui-decimal-places"].value .. "f", retval)
  				if result:len() > tostring(retval):len() then
  					result = retval
  				end
  				return result
  			end)
  		else
  			status = false
  		end

  		if retval_show == nil or retval_show == "" then

  			status = false
  		end
  		if not status then

  			retval_show = "NaN"

  			show_rant(player, true)
  		else
  			if retval <= 0 then

  				show_think(player, true)

  			else 
  				show_rant(player, false)
  			end
  		end

  		root.calcui.calcui_table.calcui_table_col2.calcui_display_result.caption = "= " .. retval_show

  		
  		-- only write in recent table if actually a result
  		if status then
  			-- check last equation and only insert if not the same
  			local item_size = #root.calcui.calcui_table.calcui_table_col2.calcui_scroll_pane.calcui_result_table.children
  			
  			if item_size == 0 or root.calcui.calcui_table.calcui_table_col2.calcui_scroll_pane.calcui_result_table.children[item_size-1].caption ~= original_equation then
  				local recent_equation = root.calcui.calcui_table.calcui_table_col2.calcui_scroll_pane.calcui_result_table.add({
  					type = "label", 
  					name = "calcui_recent_equation_" .. item_size, 
  					caption = original_equation,
  					tooltip = {"calculator-ui.recent_tooltip"}
  				})
  				local recent_result = root.calcui.calcui_table.calcui_table_col2.calcui_scroll_pane.calcui_result_table.add({
  					type = "label", 
  					name = "calcui_recent_result_" .. item_size, 
  					caption = root.calcui.calcui_table.calcui_table_col2.calcui_display_result.caption
  				})
  				root.calcui.calcui_table.calcui_table_col2.calcui_scroll_pane.scroll_to_bottom()
  			end
  		end
  	end

  
  	if settings.get_player_settings(player)["calcui-clear-on-calc"].value then
  		clear_equation(player)
  	end

  end
  
  -- ----------------------------------------------------------------
  function display_addchar(player, char)
  	local root = get_gui_root(player)
  	root.calcui.calcui_table.calcui_table_col1.calcui_display.text = root.calcui.calcui_table.calcui_table_col1.calcui_display.text .. char
  	show_rant(player, false)
  end
  
  -- ----------------------------------------------------------------
  local button_dispatch = {
  	["CE"]  = process_ce_key,
  	["C"]   = process_c_key,
  	["BS"]  = process_backspace_key,
  	--
  	["EQU"] = process_equal_key
  }
  local button_addchar = {
  	["DIV"]  = "/",
  	--
  	["7"]    = "7",
  	["8"]    = "8",
  	["9"]    = "9",
  	["MUL"]  = "*",
  	--
  	["4"]    = "4",
  	["5"]    = "5",
  	["6"]    = "6",
  	["SUB"]  = "-",
  	--
  	["1"]    = "1",
  	["2"]    = "2",
  	["3"]    = "3",
  	["ADD"]  = "+",
  	--
  	["PERC"] = "%",
  	["0"]    = "0",
  	["DOT"]  = "."
  }
  
  function handle_calcui_click(event, player)
  	debug_print("handle_calcui_click()")
  	local event_name = event.element.name
  	local button_prefix = "calcui_button_"
  	local button_prefix_len = string.len(button_prefix)
  	
  	local recent_prefix = "calcui_recent_"
  	local recent_prefix_len = string.len(recent_prefix);
  	
  	-- calculator buttons
  	if string.sub(event_name, 1, button_prefix_len) == button_prefix then
  		show_rant(player, false)
  
  		button = string.sub(event_name, button_prefix_len + 1 )
  		debug_print("handle_calcui_click button " .. button)
  		local dispatch_func = button_dispatch[button]
  		if dispatch_func then
  			dispatch_func(player, button)
  		end
  		
  		local addchar = button_addchar[button]
  		if addchar then
  			display_addchar(player, addchar)
  		end
  	-- close button
  	elseif event_name == "calcui_close" then
  		hide_calculator(player)
  	-- recent results
  	elseif string.sub(event_name, 1, recent_prefix_len) == recent_prefix then
  		if event.button == defines.mouse_button_type.left and 
  		   event.shift == true then
  			-- copy equation to display
  			local root = get_gui_root(player)
  			root.calcui.calcui_table.calcui_table_col1.calcui_display.text = root.calcui.calcui_table.calcui_table_col2.calcui_scroll_pane.calcui_result_table[event_name].caption

  			focus_on_input(player)

  		end
  	end
  end
  
  -- ----------------------------------------------------------------
  function calcui_on_gui_text_changed(event)
  	if event.element.name == "calcui_display" then
  		local player = game.players[event.player_index]
  		local root = get_gui_root(player)
  		if string.find(root.calcui.calcui_table.calcui_table_col1.calcui_display.text, "=") then
  			root.calcui.calcui_table.calcui_table_col1.calcui_display.text = root.calcui.calcui_table.calcui_table_col1.calcui_display.text:gsub("=", "")
  			process_equal_key(player)
  		end
  	end
  end
  
  -- ----------------------------------------------------------------
  function calcui_on_gui_location_changed(event)
  	if event.element.name == "calcui" then
  		local player = game.players[event.player_index]
  		local root = get_gui_root(player)
  		root.calcui.location = event.element.location
  	end

  end