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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 = setmetatable, getmetatable
utilities = utilities or { }
utilities.storage = utilities.storage or { }
local storage = utilities.storage
function storage.mark(t)
if not t then
texio.write_nl("fatal error: storage cannot be marked")
return -- os.exit()
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
texio.write_nl("fatal error: storage has not been allocated")
return -- os.exit()
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_ignore() end -- t,k,v
local t_empty = { __index = f_empty }
local t_self = { __index = f_self }
local t_ignore = { __newindex = f_ignore }
function table.setmetatableindex(t,f)
local m = getmetatable(t)
if m then
if f == "empty" then
m.__index = f_empty
elseif f == "key" then
m.__index = f_self
else
m.__index = f
end
else
if f == "empty" then
setmetatable(t, t_empty)
elseif f == "key" then
setmetatable(t, t_self)
else
setmetatable(t,{ __index = f })
end
end
return t
end
function table.setmetatablenewindex(t,f)
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)
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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