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path: root/tex/context/base/mkiv/mlib-lmp.lua
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if not modules then modules = { } end modules ['mlib-lmp'] = {
    version   = 1.001,
    comment   = "companion to mlib-ctx.mkiv",
    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
    copyright = "PRAGMA ADE / ConTeXt Development Team",
    license   = "see context related readme files",
}

-- path relates stuff ... todo: use a stack (or numeric index to list)


local type = type

local aux       = mp.aux
local mpnumeric = aux.numeric
local mppair    = aux.pair
local mpquoted  = aux.quoted

do

    local p = nil
    local n = 0

    local function mf_path_reset()
        p = nil
        n = 0
    end

    if CONTEXTLMTXMODE > 0 then

        local scan       = mp.scan
        local scannumber = scan.number
        local scanpath   = scan.path

        local function mf_path_length()
            p = scanpath()
            n = p and #p or 1
            mpnumeric(n)
        end

        local function mf_path_point()
            local i = scannumber()
            if i > 0 and i <= n then
                local pi = p[i]
                mppair(pi[1],pi[2])
            end
        end

        local function mf_path_left()
            local i = scannumber()
            if i > 0 and i <= n then
                local pi = p[i]
                mppair(pi[5],pi[6])
            end
        end

        local function mf_path_right()
            local i = scannumber()
            if i > 0 and i <= n then
                local pn
                if i == 1 then
                    pn = p[2] or p[1]
                else
                    pn = p[i+1] or p[1]
                end
                mppair(pn[3],pn[4])
            end
        end

        local registerscript = metapost.registerscript

        registerscript("pathreset",    mf_path_reset)
        registerscript("pathlengthof", mf_path_length)
        registerscript("pathpointof",  mf_path_point)
        registerscript("pathleftof",   mf_path_left)
        registerscript("pathrightof",  mf_path_right)

    else

        local get       = mp.get
        local mpgetpath = get.path

        local function mf_path_length(name)
            p = mpgetpath(name)
            n = p and #p or 0
            mpnumeric(n)
        end

        local function mf_path_point(i)
            if i > 0 and i <= n then
                local pi = p[i]
                mppair(pi[1],pi[2])
            end
        end

        local function mf_path_left(i)
            if i > 0 and i <= n then
                local pi = p[i]
                mppair(pi[5],pi[6])
            end
        end

        local function mf_path_right(i)
            if i > 0 and i <= n then
                local pn
                if i == 1 then
                    pn = p[2] or p[1]
                else
                    pn = p[i+1] or p[1]
                end
                mppair(pn[3],pn[4])
            end
        end

        mp.mf_path_length = mf_path_length   mp.pathlength = mf_path_length
        mp.mf_path_point  = mf_path_point    mp.pathpoint  = mf_path_point
        mp.mf_path_left   = mf_path_left     mp.pathleft   = mf_path_left
        mp.mf_path_right  = mf_path_right    mp.pathright  = mf_path_right
        mp.mf_path_reset  = mf_path_reset    mp.pathreset  = mf_path_reset

    end

end