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local lexpr = pd.Class:new():register("lexpr")
-- AG: Lua 5.2 compatibility (cf. https://stackoverflow.com/a/14554565)
if not setfenv then -- Lua 5.2
-- based on http://lua-users.org/lists/lua-l/2010-06/msg00314.html
-- this assumes f is a function
local function findenv(f)
local level = 1
repeat
local name, value = debug.getupvalue(f, level)
if name == '_ENV' then return level, value end
level = level + 1
until name == nil
return nil end
getfenv = function (f) return(select(2, findenv(f)) or _G) end
setfenv = function (f, t)
local level = findenv(f)
if level then debug.setupvalue(f, level, t) end
return f end
end
if not loadstring then -- Lua 5.3
loadstring = load
end
local function sandbox(e, f) -- only supports nullary f() with one return
local g = getfenv(f)
setfenv(f, e)
local r = f()
setfenv(f, g)
return r
end
local lexpr_globals = {
abs = math.abs,
acos = math.acos,
asin = math.asin,
atan = math.atan,
atan2 = math.atan2,
ceil = math.ceil,
cos = math.cos,
cosh = math.cosh,
deg = math.deg,
exp = math.exp,
floor = math.floor,
fmod = math.fmod,
log = math.log,
log10 = math.log10,
max = math.max,
min = math.min,
int = function (x) i,f = math.modf(x) ; return i end,
wrap = function (x) i,f = math.modf(x) ; return f end,
pi = math.pi,
pow = math.pow,
rad = math.rad,
sin = math.sin,
sinh = math.sinh,
sqrt = math.sqrt,
tan = math.tan,
tanh = math.tanh,
val = function (s) return (pd.getvalue(s) or 0) end,
choose = function (b,t,f) if b then return t else return f end end
}
function lexpr:readexpr(atoms)
local vname = { }
local context = { }
local expr
local i
local k
local v
local j = 1
local inlets
local f
local phase = "vars"
for k,v in pairs(lexpr_globals) do
context[k] = v
end
for i,v in ipairs(atoms) do
if phase == "vars" then -- create variables
if v == "->" then
inlets = i - 1
phase = "expr"
expr = ""
else
if type(v) == "string" then
vname[j] = v
context[v] = 0
j = j + 1
else
self:error("lexpr: variable names must be symbols")
return -1
end
end
else if phase == "expr" then -- build string
expr = expr .. " " .. v
else
self:error("lexpr: internal error parsing expression")
return -1
end end
end
f = assert(loadstring("return {" .. expr .. " }"))
local outlets = #(sandbox(context, f))
return inlets, vname, context, f, outlets
end
function lexpr:initialize(sel, atoms)
self.vname = { }
self.context = { }
self.hot = { }
self.f = function () return 0 end
function self:in_1_bang()
local r = sandbox(self.context, self.f)
local i
for i = self.outlets,1,-1 do
if type(r[i]) == "number" then
self:outlet(i, "float", { r[i] })
else if type(r[i]) == "string" then
self:outlet(i, "symbol", { r[i] })
else
self:error("calculated a " .. type(r[i]) .. " but expected a number or a string")
end end
end
end
function self:in_n_float(i, f)
self.context[self.vname[i]] = f
if self.hot[i] then self:in_1_bang() end
end
function self:in_n_symbol(i, s)
self.context[self.vname[i]] = s
if self.hot[i] then self:in_1_bang() end
end
function self:in_n_hot(i, atoms)
if type(atoms[1]) == "number" then
self.hot[i] = atoms[1] ~= 0
else
self:error("hot method expects a float")
end
end
function self:in_1_lexpr(atoms)
local inlets
local vname
local context
local f
local outlets
inlets, vname, context, f, outlets = self:readexpr(atoms)
if (inlets == self.inlets) and (outlets == self.outlets) then
self.vname = vname
self.context = context
self.f = f
else
self:error("new expression has different inlet/outlet count")
end
end
self.inlets, self.vname, self.context, self.f, self.outlets = self:readexpr(atoms)
if self.inlets < 1 then
pd.post("lexpr: error: would have no inlets")
return false
end
if self.outlets < 1 then
pd.post("lexpr: error: would have no outlets")
return false
end
for i = 1,self.inlets,1 do
self.hot[i] = i == 1
end
return true
end
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