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if not modules then modules = { } end modules ['util-pck'] = {
version = 1.001,
comment = "companion to luat-lib.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- moved from core-uti
local next, tostring, type = next, tostring, type
local sort, concat = table.sort, table.concat
utilities = utilities or { }
utilities.packers = utilities.packers or { }
local packers = utilities.packers
packers.version = 1.00
local function hashed(t)
local s = { }
for k, v in next, t do
if type(v) == "table" then
s[#s+1] = k.."={"..hashed(v).."}"
else
s[#s+1] = k.."="..tostring(v)
end
end
sort(s)
return concat(s,",")
end
local function simplehashed(t)
local s = { }
for k, v in next, t do
s[#s+1] = k.."="..v
end
sort(s)
return concat(s,",")
end
packers.hashed = hashed
packers.simplehashed = simplehashed
local function pack(t,keys,hash,index)
for k,v in next, t do
if type(v) == "table" then
pack(v,keys,hash,index)
end
if keys[k] and type(v) == "table" then
local h = hashed(v)
local i = hash[h]
if not i then
i = #index+1
index[i] = v
hash[h] = i
end
t[k] = i
end
end
end
local function unpack(t,keys,index)
for k,v in next, t do
if keys[k] and type(v) == "number" then
local iv = index[v]
if iv then
v = iv
t[k] = v
end
end
if type(v) == "table" then
unpack(v,keys,index)
end
end
end
function packers.new(keys,version)
return {
version = version or packers.version,
keys = table.tohash(keys),
hash = { },
index = { },
}
end
function packers.pack(t,p,shared)
if shared then
pack(t,p.keys,p.hash,p.index)
elseif not t.packer then
pack(t,p.keys,p.hash,p.index)
if #p.index > 0 then
t.packer = {
version = p.version or packers.version,
keys = p.keys,
index = p.index,
}
end
p.hash, p.index = { }, { }
end
end
function packers.unpack(t,p,shared)
if shared then
if p then
unpack(t,p.keys,p.index)
end
else
local tp = t.packer
if tp then
if tp.version == (p and p.version or packers.version) then
unpack(t,tp.keys,tp.index)
else
-- fatal error, wrong version
end
t.packer = nil
end
end
end
function packers.strip(p)
p.hash = nil
end
|
