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if not modules then modules = { } end modules ['supp-ran'] = {
version = 1.001,
comment = "companion to supp-ran.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- We cannot ask for the current seed, so we need some messy hack here.
local report_system = logs.reporter("system","randomizer")
local trace_random = false trackers.register("system.randomizer", function(v) trace_random = v end)
local trace_random_mp = false trackers.register("system.randomizer.mp",function(v) trace_random_mp = v end)
local insert, remove = table.insert, table.remove
local math = math
local context = context
local implement = interfaces.implement
local random = math.random
local randomseed = math.randomseed
local round = math.round
local stack = { }
local last = 1
local maxcount = 2^30-1 -- 1073741823
local function setrandomseedi(n)
if n <= 1 then
n = n * maxcount
elseif n < 1000 then
n = n * 1000
end
n = round(n)
if trace_random then
report_system("setting seed to %s",n)
end
randomseed(n)
last = random(0,maxcount) -- we need an initial value
end
math.setrandomseedi = setrandomseedi
local function getrandomnumber(min,max)
last = random(min,max)
return last
end
local function setrandomseed(n)
last = n
setrandomseedi(n)
end
local function getrandomseed()
return last
end
local function getmprandomnumber()
last = random(0,4095)
if trace_random_mp then
report_system("using mp seed %s",last)
end
return last
end
-- maybe stack
local function pushrandomseed()
insert(stack,last)
if trace_random then
report_system("pushing seed %s",last)
end
end
local function reuserandomseed(n)
local seed = stack[#stack]
if seed then
if trace_random then
report_system("reusing seed %s",last)
end
randomseed(seed)
end
end
local function poprandomseed()
local seed = remove(stack)
if seed then
if trace_random then
report_system("popping seed %s",seed)
end
randomseed(seed)
end
end
-- todo: also open up in utilities.randomizer.*
implement { name = "getrandomnumber", actions = { getrandomnumber, context }, arguments = { "integer", "integer" } }
implement { name = "getrandomdimen", actions = { getrandomnumber, context }, arguments = { "dimen", "dimen" } }
implement { name = "getrandomfloat", actions = { getrandomnumber, context }, arguments = { "number", "number" } }
implement { name = "getmprandomnumber", actions = { getmprandomnumber, context } }
implement { name = "setrandomseed", actions = { setrandomseed }, arguments = { "integer" } }
implement { name = "getrandomseed", actions = { getrandomseed, context } }
implement { name = "pushrandomseed", actions = { pushrandomseed } }
implement { name = "poprandomseed", actions = { poprandomseed } }
implement { name = "reuserandomseed", actions = { reuserandomseed } }
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