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if not modules then modules = { } end modules ['l-boolean'] = {
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"
}
boolean = boolean or { }
local type, tonumber = type, tonumber
function boolean.tonumber(b)
if b then return 1 else return 0 end
end
function toboolean(str,tolerant)
if tolerant then
local tstr = type(str)
if tstr == "string" then
return str == "true" or str == "yes" or str == "on" or str == "1" or str == "t"
elseif tstr == "number" then
return tonumber(str) ~= 0
elseif tstr == "nil" then
return false
else
return str
end
elseif str == "true" then
return true
elseif str == "false" then
return false
else
return str
end
end
function string.is_boolean(str)
if type(str) == "string" then
if str == "true" or str == "yes" or str == "on" or str == "t" then
return true
elseif str == "false" or str == "no" or str == "off" or str == "f" then
return false
end
end
return nil
end
function boolean.alwaystrue()
return true
end
function boolean.falsetrue()
return false
end
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