summaryrefslogtreecommitdiff
path: root/Master/texmf-dist/tex/context/base/mkiv/layo-ini.lua
blob: d35d7ef6965446bb76d50d341876ec96e30f0df3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
if not modules then modules = { } end modules ['layo-ini'] = {
    version   = 1.001,
    comment   = "companion to layo-ini.mkiv",
    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
    copyright = "PRAGMA ADE / ConTeXt Development Team",
    license   = "see context related readme files"
}

-- We need to share information between the TeX and Lua end about the typographical
-- model. This happens here. This code might move.

local texgetcount  = tex.getcount
local conditionals = tex.conditionals

layouts = {
    status = { },
}

local status = layouts.status

function status.leftorrightpagection(left,right)
    if left == nil then
        left, right = false, true
    end
    if not conditionals.layoutisdoublesided then
        return left, right
    elseif conditionals.layoutissinglesided then
        return left, right
    elseif texgetcount("pagenoshift") % 2 == 0 then
        if texgetcount("realpageno") % 2 == 0 then
            return right, left
        else
            return left, right
        end
    else
        if texgetcount("realpageno") % 2 == 0 then
            return left, right
        else
            return right, left
        end
    end
end

function status.isleftpage()
    if not conditionals.layoutisdoublesided then
        return false
    elseif conditionals.layoutissinglesided then
        return false
    elseif texgetcount("pagenoshift") % 2 == 0 then
        return texgetcount("realpageno") % 2 == 0
    else
        return not texgetcount("realpageno") % 2 == 0
    end
end