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if not modules then modules = { } end modules ['core-env'] = {
version = 1.001,
comment = "companion to core-env.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- maybe this will move to the context name space although the
-- plurals are unlikely to clash with future tex primitives
--
-- if tex.modes['xxxx'] then .... else .... end
local csname_id, texcount, create = token.csname_id, tex.count, token.create
local undefined = csname_id("*undefined*crap*")
local iftrue = create("iftrue")[2] -- inefficient hack
tex.modes = { } local modes = { }
tex.systemmodes = { } local systemmodes = { }
tex.constants = { }
tex.conditionals = { }
tex.ifs = { }
setmetatable(tex.modes, { __index = function(t,k)
local m = modes[k]
if m then
return m()
else
local n = "mode" .. k
if csname_id(n) == undefined then
return false
else
modes[k] = function() return texcount[n] >= 1 end
return texcount[n] >= 1
end
end
end })
setmetatable(tex.systemmodes, { __index = function(t,k)
local m = systemmodes[k]
if m then
return m()
else
local n = "mode*" .. k
if csname_id(n) == undefined then
return false
else
systemmodes[k] = function() return texcount[n] >= 1 end
return texcount[n] >= 1
end
end
end })
setmetatable(tex.constants, { __index = function(t,k)
return csname_id(k) ~= undefined and texcount[k] or 0
end })
setmetatable(tex.conditionals, { __index = function(t,k) -- 0 == true
return csname_id(k) ~= undefined and texcount[k] == 0
end })
setmetatable(tex.ifs, { __index = function(t,k)
return csname_id(k) ~= undefined and create(k)[2] == iftrue -- inefficient, this create, we need a helper
end })
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