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if not modules then modules = { } end modules ['cldf-stp'] = {
version = 1.001,
comment = "companion to cldf-ini.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- limitation: input levels
-- context.stepwise (function()
-- ...
-- context.step(nil|...)
-- ...
-- context.step(nil|...)
-- ...
-- context.stepwise (function()
-- ...
-- context.step(nil|...)
-- ...
-- context.step(nil|...)
-- ...
-- end)
-- ...
-- context.step(nil|...)
-- ...
-- context.step(nil|...)
-- ...
-- end)
local context = context
local create = coroutine.create
local yield = coroutine.yield
local resume = coroutine.resume
local status = coroutine.status
local stepper = nil
local stack = { } -- will never be deep so no gc needed
local depth = 0
local function nextstep()
if status(stepper) == "dead" then
stepper = stack[depth]
depth = depth - 1
stack[depth] = false
end
resume(stepper)
end
interfaces.implement {
name = "step",
actions = nextstep,
}
local ctx_resume = context.protected.cs.clf_step
local closeinput = texio.closeinput -- experiment
local closeindeed = true
local stepsindeed = true
directives.register("context.steps.nosteps",function(v) stepsindeed = not v end)
directives.register("context.steps.noclose",function(v) closeindeed = not v end)
if closeinput then
function context.step(first,...)
if first ~= nil then
context(first,...)
end
if stepper then
ctx_resume()
yield()
if closeindeed then
closeinput()
end
end
end
else
function context.step(first,...)
if first ~= nil then
context(first,...)
end
if stepper then
ctx_resume()
yield()
end
end
end
function context.stepwise(f)
if stepsindeed then
depth = depth + 1
stack[depth] = stepper
stepper = create(f)
-- ctx_resume(stepper)
ctx_resume()
else
f()
end
end
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