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--[[
lsymbol-drip
Output a symbol as a sequence of characters
author Martin Peach 20120403
--]]
-- Pd class
local LsymbolDrip = pd.Class:new():register("lsymbol-drip")
function LsymbolDrip:initialize(name, atoms)
self.inlets = 1
self.outlets = 1
return true
end
-- LsymbolDrip:drip: accumulate possibly multibyte characters from buf and output them as symbols
function LsymbolDrip:drip(buf)
--pd.post(buf.. " size " .. #buf)
local i = 1, j, b
local len = #buf
while i <= len do
j = i -- character is one byte long
b = string.byte(buf, i)
--pd.post("*b is " .. b .. " i is " .. i)
while b > 0x7f and j < len do -- multibyte characters have their high bit set
j = j + 1
b = string.byte(buf, j)
--pd.post("_b is " .. b .. " j is " .. j)
end
if j ~= i and j < len then j = j - 1 end -- j was pointing to the next character
self:outlet(1, "symbol", {string.sub(buf, i, j)})
i = j + 1 -- start of next character
end
end
function LsymbolDrip:in_1(sel, atoms) -- anything
--pd.post("sel is " .. sel);
--pd.post("number of atoms is ".. #atoms)
--for i,v in ipairs(atoms) do
-- pd.post(i .. " = " .. v)
--end
local buf
if sel == "symbol" then -- the usual case
buf = tostring(atoms[1])
self:drip(buf)
elseif #atoms == 0 then -- a selector
buf = tostring(sel)
self:drip(buf)
else -- reject non-symbols
self:error("lsymbol-drip: input not a symbol")
end
end
-- end of lsymbol-drip
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