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plugin.lua
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plugin.lua
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--[[
opencalc - an open source calculator
Copyright (C) 2011 Richard Titmuss <richard@opencalc.me>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program in the file COPYING; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
--]]
local mp = require("mp")
module(..., package.seeall)
local Menu = require("input.menu")
Plugin = {}
local functions = {}
local units = {}
local units_cast = {}
local units_cast_default = {}
local units_convert = {}
setmetatable(units_cast, {
__index = function()
return units_cast_default
end })
local newPlugins = false
function Plugin:isNewPlugins()
if newPlugins then
newPlugins = false
return true
end
return false
end
-- Functions
--[[
TODO document
--]]
function Plugin:addFunction(def)
table.insert(functions, def)
newPlugins = true
Menu:addItem(Menu.functionMenu, {
def.name,
function(sheet, val)
if val then
sheet:getView():event({
type = "keypress",
key = def.name
})
return true
end
return def.desc
end,
})
-- test cases
if plugin_testcase then
plugin_testcase[def.name .. "_test"] = function()
plugin_testcase.check(def.name, def.test)
end
else
def.test = nil
end
end
function Plugin:ifunctions()
-- sort functions for parsers, longest match first
table.sort(functions, function(a, b)
if #a.name == #b.name then
return a.name < b.name
end
return #a.name > #b.name
end)
return ipairs(functions)
end
-- Units
local convertMenu = {
title = "Convert"
}
Menu:addItem(Menu.unitMenu, {
"Convert",
submenu = convertMenu,
})
--[[
TODO document
--]]
function Plugin:addUnit(def)
table.insert(units, def)
units[def.name] = def
newPlugins = true
Menu:addItem(Menu.unitMenu, {
def.name,
function(sheet, val)
if val then
sheet:getView():event({
type = "keypress",
key = def.name
})
return true
end
return def.desc
end,
})
Menu:addItem(convertMenu, {
def.name,
function(sheet, val)
if val then
sheet:getView():event({
type = "keypress",
key = " in " .. def.name
})
return true
end
return def.desc
end,
})
end
--[[
TODO document
--]]
function Plugin:addCast(def)
newPlugins = true
assert(units[def.unit1], "Unit not defined: " .. def.unit1)
assert(units[def.unit2], "Unit not defined: " .. def.unit2)
local key = def.unit1 .. "," .. def.unit2
if def.op then
if not rawget(units_cast, def.op) then
rawset(units_cast, def.op, {})
end
units_cast[def.op][key] = def.cast
else
units_cast_default[key] = def.cast
end
end
--[[
TODO document
--]]
function Plugin:addConversion(def)
newPlugins = true
if type(def.from) ~= "table" then
def.from = { def.from }
def.convert = { def.convert }
def.inverse = { def.inverse }
end
assert(units[def.to], "Unit not defined: " .. def.to)
for i,from in ipairs(def.from) do
local convert = def.convert[i]
local inverse = def.inverse[i]
assert(units[from], "Unit not defined: " .. from)
if not units_convert[from] then
units_convert[from] = {}
end
units_convert[from][def.to] = convert
if inverse then
if not units_convert[def.to] then
units_convert[def.to] = {}
end
units_convert[def.to][from] = inverse
end
end
-- test cases
if plugin_testcase then
plugin_testcase[def.to .. "_test"] = function()
plugin_testcase.check(def.to, def.test)
end
end
end
function Plugin:iunits()
-- sort units for parsers, longest match first
table.sort(units, function(a, b)
if #a.name == #b.name then
return a.name < b.name
end
return #a.name > #b.name
end)
return ipairs(units)
end
function convert(value, unit)
local lookup1, convert1, convert2
lookup1 = units_convert[value:unit()]
assert(lookup1, "Can't convert " .. value:unit())
convert1 = lookup1[unit]
if not convert1 then
for key,value in pairs(lookup1) do
convert2 = units_convert[key][unit]
if convert2 then
convert1 = value
break
end
end
end
assert(convert1, "Can't convert " .. value:unit() .. " to " .. unit)
if (type(convert1) == "string") then
value = mp.mul(value, mp.new(convert1))
elseif (type(convert1) == "function") then
value = convert1(value, unit)
end
if (type(convert2) == "string") then
value = mp.mul(value, mp.new(convert2))
elseif (type(convert2) == "function") then
value = convert2(value, unit)
end
value = mp.new(value, unit)
return value
end
-- configure mplib
mp.cast = units_cast
mp.convert = convert
return Plugin