\usemodule[chart]

\startluacode

local format       = string.format
local points       = number.nopts
local ptfactor     = number.dimenfactors.pt

local nodecodes    = nodes.nodecodes
local kerncodes    = nodes.kerncodes
local penaltycodes = nodes.penaltycodes
local gluecodes    = nodes.gluecodes
local whatsitcodes = nodes.whatsitcodes

local formatters = { }

function formatters.glyph(n,comment)
    -- subtype font char lang left right uchyph components xoffset yoffset width height depth
    return format("\\doFLOWglyphnode{%s}{%s}{%s}{%s}{U+%05X}",comment,n.subtype,n.font,n.char,n.char)
end

function formatters.disc(n,comment)
    -- pre post replace
    return format("\\doFLOWdiscnode{%s}{%s}",comment,n.subtype)
end

function formatters.kern(n,comment)
    -- subtype kern
 -- return format("\\doFLOWkernnode{%s}{%s}{%s}",comment,kerncodes[n.subtype],points(n.kern))
    return format("\\doFLOWkernnode{%s}{%s}{%.4f}",comment,kerncodes[n.subtype],n.kern*ptfactor)
end

function formatters.penalty(n,comment)
    -- subtype penalty
    return format("\\doFLOWpenaltynode{%s}{%s}{%s}",comment,"penalty",n.penalty)
end

function formatters.glue(n,comment)
    -- subtype width leader spec (stretch shrink ...
    local s = n.spec
 -- return format("\\doFLOWgluenode{%s}{%s}{%s}{%s}{%s}",comment,gluecodes[n.subtype],points(s.width),points(s.stretch),points(s.shrink))
    return format("\\doFLOWgluenode{%s}{%s}{%.4f}{%.4f}{%.4f}",comment,gluecodes[n.subtype],s.width*ptfactor,s.stretch*ptfactor,s.shrink*ptfactor)
end

function formatters.whatsit(n,comment)
    -- subtype width leader spec (stretch shrink ...
    local subtype = n.subtype
    local whatsit = whatsitcodes[subtype]
    if whatsit == "dir" or whatsit == "localpar" then
        return format("\\doFLOWdirnode{%s}{%s}{%s}",comment,whatsit,n.dir)
    else
        return nodecodes[n.id]
    end
end

local shapes = { -- I will make a dedicated set of shapes for this.
    glyph   = "procedure",
    disc    = "procedure",
    kern    = "action",
    penalty = "action",
    glue    = "action",
}

local function flow_nodes_to_chart(head,comment,x,y,how)
    local current = head
    while current do
        local nodecode  = nodecodes[current.id]
        local formatter = formatters[nodecode]
        local shape     = shapes[nodecode]
        y = y + 1
        local next = current.next
        commands.flow_start_cell { shape = { framecolor = "nodechart:" .. nodecode } }
        commands.flow_set_name(tostring(current))
        commands.flow_set_location(x,y)
        if shape then
            commands.flow_set_shape(shape)
        end
        if formatter then
            commands.flow_set_text("node",formatter(current,comment))
        else
            commands.flow_set_text("node",nodecode)
        end
        if next then
            commands.flow_set_connection("bt","",tostring(next))
        end
        if nodecode == "glyph" then
            local components = current.components
            if components then
                commands.flow_set_connection("rl","",tostring(components))
                commands.flow_stop_cell()
                n = flow_nodes_to_chart(components,"component",x+2,y-1)
            else
                commands.flow_stop_cell()
            end
        elseif nodecode == "disc" then
            local pre = current.pre
            local pos = current.post
            local rep = current.replace
            if pre and not rep and not rep then
                if pre then
                    commands.flow_set_connection("rl","",tostring(pre))
                end
                commands.flow_stop_cell()
                if pre then
                    n = flow_nodes_to_chart(pre,"prebreak",x+1,y-1)
                end
            else
                if pre then
                    commands.flow_set_connection("+rl","",tostring(pre))
                end
                if rep then
                    commands.flow_set_connection("rl","",tostring(rep))
                end
                if pos then
                    commands.flow_set_connection("-rl","",tostring(pos))
                end
                commands.flow_stop_cell()
                if pre then
                    n = flow_nodes_to_chart(pre,"prebreak",x+1,y-2)
                end
                if rep then
                    n = flow_nodes_to_chart(rep,"replacement",x+1,y-1)
                end
                if pos then
                    n = flow_nodes_to_chart(pos,"postbreak",x+1,y)
                end
            end
        elseif nodecode == "hlist" then
            local list = current.list
            if list then
                commands.flow_set_connection("rl","",tostring(list))
                commands.flow_stop_cell()
                n = flow_nodes_to_chart(list,"list",x+2,y-1)
            else
                commands.flow_stop_cell()
            end
        else
            commands.flow_stop_cell()
        end
        current = next
    end
    return n
end

function commands.flow_nodes_to_chart(name,head,max)
    commands.flow_start_chart(name)
    flow_nodes_to_chart(head,"",1,0)
    commands.flow_stop_chart()
end

\stopluacode

\unprotect

\def\enspaceminus{\hskip.5em minus .25em\relax}

\starttexdefinition unexpanded doFLOWglyphnode #comment #subtype #font #char #unicode
   \dontleavehmode\hbox{\bf\setstrut\strut \doifsomething{#comment}{#comment\enspaceminus:\enspaceminus}glyph #subtype}
   \vss
   \dontleavehmode\hbox{\tx\setstrut\strut font\enspaceminus#font:\enspace#unicode:\enspaceminus\setfontofid{#font}\char#char}
\stoptexdefinition

\starttexdefinition unexpanded doFLOWdiscnode #comment #subtype
   \dontleavehmode\hbox{\bf\setstrut\strut disc}
   \vss
   \dontleavehmode\hbox{\tx\setstrut\strut}
\stoptexdefinition

\starttexdefinition unexpanded doFLOWkernnode #comment #subtype #kern
   \dontleavehmode\hbox{\bf\setstrut\strut#subtype}
   \vss
   \dontleavehmode\hbox{\tx\setstrut\strut#kern}
\stoptexdefinition

\starttexdefinition unexpanded doFLOWpenaltynode #comment #subtype #penalty
   \dontleavehmode\hbox{\bf\setstrut\strut#subtype}
   \vss
   \dontleavehmode\hbox{\tx\setstrut\strut#penalty}
\stoptexdefinition

\starttexdefinition unexpanded doFLOWgluenode #comment #subtype #width #shrink #stretch
   \dontleavehmode\hbox{\bf\setstrut\strut#subtype}
   \vss
   \dontleavehmode\hbox{\tx\setstrut\strut#width\enspaceminus-\enspaceminus#shrink\enspaceminus+\enspaceminus#stretch}
\stoptexdefinition

\starttexdefinition unexpanded doFLOWdirnode #comment #subtype #direction
   \dontleavehmode\hbox{\bf\setstrut\strut#subtype}
   \vss
   \dontleavehmode\hbox{\tx\setstrut\strut#direction}
\stoptexdefinition

\defineframed
  [flowcell:node]
  [flowcell:base]
  [\c!top=\vss,
   \c!bottom=\vss,
   \c!align=\v!middle,
   \c!foregroundstyle=\tt]

% this is a temporary interface ... we will have instances and optional settings

\unexpanded\def\boxtoFLOWchart#name#max#box%
  {\ctxcommand{flow_nodes_to_chart("#name",tex.box[\number#box].list,\number#max)}}

\unexpanded\def\nextboxtoFLOWchart#name#max%
  {\dowithnextbox{\boxtoFLOWchart{#name}{#max}\nextbox}}

\unexpanded\def\hboxtoFLOWchart#name#max%
  {\nextboxtoFLOWchart{#name}{#max}\hbox}

\unexpanded\def\vboxtoFLOWchart#name#max%
  {\nextboxtoFLOWchart{#name}{#max}\vbox}

\protect

\continueifinputfile{m-nodechart.mkvi}

\definecolor[nodechart:glyph][darkred]

\setupbodyfont[dejavu,10pt]

\starttext

\startTEXpage[offset=10pt]

    \hboxtoFLOWchart{dummy}{3}{an affil\discretionary{-}{-}{!}iation}

    \FLOWchart[dummy][width=14em,height=3em,dx=1em,dy=.75em,hcompact=yes]

\stopTEXpage

\startTEXpage[offset=10pt]

    \hboxtoFLOWchart{dummy}{3}{an affiliation}

    \FLOWchart[dummy][width=14em,height=3em,dx=.5em,dy=.75em,hcompact=yes]

\stopTEXpage

\startTEXpage[offset=10pt]

    \hboxtoFLOWchart{dummy}{3}{\nl effe fijn fietsen}

    \FLOWchart[dummy][width=14em,height=3em,dx=.5em,dy=.75em,hcompact=yes]

\stopTEXpage

\startTEXpage[offset=10pt]

    \hboxtoFLOWchart{dummy}{3}{\righttoleft t\kern 1pt est}

    \FLOWchart[dummy][width=14em,height=3em,dx=.5em,dy=.75em,hcompact=yes]

\stopTEXpage

\stoptext