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if not modules then modules = { } end modules ['util-sto'] = {
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"
}
local setmetatable, getmetatable, type = setmetatable, getmetatable, type
utilities = utilities or { }
utilities.storage = utilities.storage or { }
local storage = utilities.storage
function storage.mark(t)
if not t then
print("\nfatal error: storage cannot be marked\n")
os.exit()
return
end
local m = getmetatable(t)
if not m then
m = { }
setmetatable(t,m)
end
m.__storage__ = true
return t
end
function storage.allocate(t)
t = t or { }
local m = getmetatable(t)
if not m then
m = { }
setmetatable(t,m)
end
m.__storage__ = true
return t
end
function storage.marked(t)
local m = getmetatable(t)
return m and m.__storage__
end
function storage.checked(t)
if not t then
report("\nfatal error: storage has not been allocated\n")
os.exit()
return
end
return t
end
-- function utilities.storage.delay(parent,name,filename)
-- local m = getmetatable(parent)
-- m.__list[name] = filename
-- end
--
-- function utilities.storage.predefine(parent)
-- local list = { }
-- local m = getmetatable(parent) or {
-- __list = list,
-- __index = function(t,k)
-- local l = require(list[k])
-- t[k] = l
-- return l
-- end
-- }
-- setmetatable(parent,m)
-- end
--
-- bla = { }
-- utilities.storage.predefine(bla)
-- utilities.storage.delay(bla,"test","oepsoeps")
-- local t = bla.test
-- table.print(t)
-- print(t.a)
function storage.setinitializer(data,initialize)
local m = getmetatable(data) or { }
m.__index = function(data,k)
m.__index = nil -- so that we can access the entries during initializing
initialize()
return data[k]
end
setmetatable(data, m)
end
local keyisvalue = { __index = function(t,k)
t[k] = k
return k
end }
function storage.sparse(t)
t = t or { }
setmetatable(t,keyisvalue)
return t
end
-- table namespace ?
local function f_empty () return "" end -- t,k
local function f_self (t,k) t[k] = k return k end
local function f_table (t,k) local v = { } t[k] = v return v end
local function f_ignore() end -- t,k,v
local t_empty = { __index = f_empty }
local t_self = { __index = f_self }
local t_table = { __index = f_table }
local t_ignore = { __newindex = f_ignore }
function table.setmetatableindex(t,f)
if type(t) ~= "table" then
f, t = t, { }
end
local m = getmetatable(t)
if m then
if f == "empty" then
m.__index = f_empty
elseif f == "key" then
m.__index = f_self
elseif f == "table" then
m.__index = f_table
else
m.__index = f
end
else
if f == "empty" then
setmetatable(t, t_empty)
elseif f == "key" then
setmetatable(t, t_self)
elseif f == "table" then
setmetatable(t, t_table)
else
setmetatable(t,{ __index = f })
end
end
return t
end
function table.setmetatablenewindex(t,f)
if type(t) ~= "table" then
f, t = t, { }
end
local m = getmetatable(t)
if m then
if f == "ignore" then
m.__newindex = f_ignore
else
m.__newindex = f
end
else
if f == "ignore" then
setmetatable(t, t_ignore)
else
setmetatable(t,{ __newindex = f })
end
end
return t
end
function table.setmetatablecall(t,f)
if type(t) ~= "table" then
f, t = t, { }
end
local m = getmetatable(t)
if m then
m.__call = f
else
setmetatable(t,{ __call = f })
end
return t
end
function table.setmetatablekey(t,key,value)
local m = getmetatable(t)
if not m then
m = { }
setmetatable(t,m)
end
m[key] = value
return t
end
function table.getmetatablekey(t,key,value)
local m = getmetatable(t)
return m and m[key]
end
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