forked from minetest-mods/mesecons
FPGA: Add 'unary' value to talbe. Document
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7784b13da5
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@ -192,7 +192,7 @@ plg.to_formspec_string = function(is, err)
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local function dropdown_action(x, y, name, val)
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local function dropdown_action(x, y, name, val)
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local selected = 0
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local selected = 0
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local titles = { " " }
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local titles = { " " }
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for i, data in ipairs(lcore.get_operands()) do
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for i, data in ipairs(lcore.get_operations()) do
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titles[i + 1] = data.fs_name
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titles[i + 1] = data.fs_name
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if val == data.gate then
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if val == data.gate then
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selected = i + 1
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selected = i + 1
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@ -249,7 +249,7 @@ plg.from_formspec_fields = function(fields)
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end
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end
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end
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end
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local function read_action(s)
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local function read_action(s)
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for i, data in ipairs(lcore.get_operands()) do
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for i, data in ipairs(lcore.get_operations()) do
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if data.fs_name == s then
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if data.fs_name == s then
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return data.gate
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return data.gate
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end
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end
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@ -1,20 +1,25 @@
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local lg = {}
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local lg = {}
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local operands = {
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local operations = {
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-- index: Index in formspec
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-- table index: Index in the formspec dropdown
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-- gate: Internal name
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-- short: Serialized form, single character
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-- fs_name: Display name, padded to 4 characters
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-- func: Function that applies the operation
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-- unary: Whether this gate only has one input
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{ gate = "and", short = "&", fs_name = " AND", func = function(a, b) return a and b end },
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{ gate = "and", short = "&", fs_name = " AND", func = function(a, b) return a and b end },
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{ gate = "or", short = "|", fs_name = " OR", func = function(a, b) return a or b end },
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{ gate = "or", short = "|", fs_name = " OR", func = function(a, b) return a or b end },
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{ gate = "not", short = "~", fs_name = " NOT", func = function(a, b) return not b end },
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{ gate = "not", short = "~", fs_name = " NOT", func = function(a, b) return not b end, unary = true },
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{ gate = "xor", short = "^", fs_name = " XOR", func = function(a, b) return a ~= b end },
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{ gate = "xor", short = "^", fs_name = " XOR", func = function(a, b) return a ~= b end },
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{ gate = "nand", short = "?", fs_name = "NAND", func = function(a, b) return not (a and b) end },
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{ gate = "nand", short = "?", fs_name = "NAND", func = function(a, b) return not (a and b) end },
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{ gate = "buf", short = "_", fs_name = " =", func = function(a, b) return b end },
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{ gate = "buf", short = "_", fs_name = " =", func = function(a, b) return b end, unary = true },
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{ gate = "xnor", short = "=", fs_name = "XNOR", func = function(a, b) return a == b end },
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{ gate = "xnor", short = "=", fs_name = "XNOR", func = function(a, b) return a == b end },
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{ gate = "nor", short = "!", fs_name = " NOR", func = function(a, b) return not (a or b) end },
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{ gate = "nor", short = "!", fs_name = " NOR", func = function(a, b) return not (a or b) end },
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}
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}
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lg.get_operands = function()
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lg.get_operations = function()
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return operands
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return operations
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end
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end
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-- (de)serialize
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-- (de)serialize
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@ -30,7 +35,7 @@ lg.serialize = function(t)
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end
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end
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-- Serialize actions (gates) from eg. "and" to "&"
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-- Serialize actions (gates) from eg. "and" to "&"
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local function _action(action)
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local function _action(action)
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for i, data in ipairs(operands) do
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for i, data in ipairs(operations) do
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if data.gate == action then
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if data.gate == action then
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return data.short
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return data.short
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end
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end
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@ -61,7 +66,7 @@ lg.deserialize = function(s)
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end
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end
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-- Deserialize actions (gates) from eg. "&" to "and"
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-- Deserialize actions (gates) from eg. "&" to "and"
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local function _action(action)
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local function _action(action)
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for i, data in ipairs(operands) do
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for i, data in ipairs(operations) do
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if data.short == action then
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if data.short == action then
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return data.gate
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return data.gate
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end
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end
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@ -116,16 +121,25 @@ lg.validate_single = function(t, i)
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return false
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return false
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end
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end
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local elem = t[i]
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local elem = t[i]
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local gate_data
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for j, data in ipairs(operations) do
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if data.gate == elem.action then
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gate_data = data
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break
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end
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end
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-- check for completeness
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-- check for completeness
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if elem.action == nil then
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if not gate_data then
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return {i = i, msg = "Gate type required"}
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return {i = i, msg = "Gate type is required"}
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elseif elem.action == "not" or elem.action == "buf" then
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elseif gate_data.unary then
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if elem.op1 ~= nil or elem.op2 == nil or elem.dst == nil then
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if elem.op1 ~= nil or elem.op2 == nil or elem.dst == nil then
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return {i = i, msg = "Second operand (only) and destination required"}
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return {i = i, msg = "Second operand (only) and destination are required"}
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end
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end
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else
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else
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if elem.op1 == nil or elem.op2 == nil or elem.dst == nil then
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if elem.op1 == nil or elem.op2 == nil or elem.dst == nil then
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return {i = i, msg = "Operands and destination required"}
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return {i = i, msg = "Operands and destination are required"}
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end
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end
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end
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end
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-- check whether operands/destination are identical
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-- check whether operands/destination are identical
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@ -166,7 +180,7 @@ end
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-- interpreter
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-- interpreter
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lg.interpret = function(t, a, b, c, d)
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lg.interpret = function(t, a, b, c, d)
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local function _action(s, v1, v2)
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local function _action(s, v1, v2)
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for i, data in ipairs(operands) do
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for i, data in ipairs(operations) do
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if data.gate == s then
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if data.gate == s then
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return data.func(v1, v2)
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return data.func(v1, v2)
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end
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end
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