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%D \module
%D   [       file=m-morse,
%D        version=2010.12.10,
%D          title=\CONTEXT\ Extra Modules,
%D       subtitle=Morse,
%D         author=Hans Hagen,
%D           date=\currentdate,
%D      copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.

% todo: act upon the node list
% make it a buffer operation
% nice in cld manual

\startluacode

moduledata.morse = moduledata.morse or { }
local morse      = moduledata.morse

local utfcharacters, gsub = string.utfcharacters, string.gsub
local ucchars, shchars = characters.ucchars, characters.shchars

local codes = {

    ["A"] = "·—",
    ["B"] = "—···",
    ["C"] = "—·—·",
    ["D"] = "—··",
    ["E"] = "·",
    ["F"] = "··—·",
    ["G"] = "——·",
    ["H"] = "····",
    ["I"] = "··",
    ["J"] = "·———",
    ["K"] = "—·—",
    ["L"] = "·—··",
    ["M"] = "——",
    ["N"] = "—·",
    ["O"] = "———",
    ["P"] = "·——·",
    ["Q"] = "——·—",
    ["R"] = "·—·",
    ["S"] = "···",
    ["T"] = "—",
    ["U"] = "··—",
    ["V"] = "···—",
    ["W"] = "·——",
    ["X"] = "—··—",
    ["Y"] = "—·——",
    ["Z"] = "——··",

    ["0"] = "—————",
    ["1"] = "·————",
    ["2"] = "··———",
    ["3"] = "···——",
    ["4"] = "····—",
    ["5"] = "·····",
    ["6"] = "—····",
    ["7"] = "——···",
    ["8"] = "———··",
    ["9"] = "————·",

    ["."] = "·—·—·—",
    [","] = "——··——",
    [":"] = "———···",
    [";"] = "—·—·—",

    ["?"] = "··——··",
    ["!"] = "—·—·——",

    ["-"] = "—····—",
    ["/"] = "—··—· ",

    ["("] = "—·——·",
    [")"] = "—·——·—",

    ["="] = "—···—",
    ["@"] = "·——·—·",

    ["'"] = "·————·",
    ['"'] = "·—··—·",

    ["À"] =	"·——·—",
    ["Å"] =	"·——·—",
    ["Ä"] =	"·—·—",
    ["Æ"] =	"·—·—",
    ["Ç"] =	"—·—··",
    ["É"] =	"··—··",
    ["È"] =	"·—··—",
    ["Ñ"] =	"——·——",
    ["Ö"] =	"———·",
    ["Ø"] =	"———·",
    ["Ü"] =	"··——",
    ["ß"] =	"··· ···",

}

morse.codes = codes

local fallbackself = false

local function codefallback(t,k)
    if k then
        local u = ucchars[k]
        local v = rawget(t,u) or rawget(t,shchars[u]) or false
        t[k] = v
        return v
    elseif fallbackself then
        return k
    else
        return false
    end
end

table.setmetatableindex(codes,codefallback)

local MorseBetweenWords      = context.MorseBetweenWords
local MorseBetweenCharacters = context.MorseBetweenCharacters
local MorseLong              = context.MorseLong
local MorseShort             = context.MorseShort
local MorseSpace             = context.MorseSpace
local MorseUnknown           = context.MorseUnknown

local function toverbose(str)
    str = gsub(str,"%s*+%s*","+")
    str = gsub(str,"%s+"," ")
    local done = false
    for m in utfcharacters(str) do
        if done then
            MorseBetweenCharacters()
        end
        if m == "·" or m == "." then
            MorseShort()
            done = true
        elseif m == "—" or m == "-" then
            MorseLong()
            done = true
        elseif m == " " then
            if done then
                MorseBetweenCharacters()
            end
            done = false
        elseif m == "+" then
            MorseBetweenWords()
            done = false
        else
            MorseUnknown(m)
        end
    end
end

local function toregular(str)
    local inmorse = false
    for s in utfcharacters(str) do
        local m = codes[s]
        if m then
            if inmorse then
                MorseBetweenWords()
            else
                inmorse = true
            end
            local done = false
            for m in utfcharacters(m) do
                if done then
                    MorseBetweenCharacters()
                else
                    done = true
                end
                if m == "·" then
                    MorseShort()
                elseif m == "—" then
                    MorseLong()
                elseif m == " " then
                    MorseBetweenCharacters()
                end
            end
            inmorse = true
        elseif s == "\n" or s == " " then
            MorseSpace()
            inmorse = false
        else
            if inmorse then
                MorseBetweenWords()
            else
                inmorse = true
            end
            MorseUnknown(s)
        end
    end
end

local function tomorse(str,verbose)
    if verbose then
        toverbose(str)
    else
        toregular(str)
    end
end

morse.tomorse = tomorse

function morse.filetomorse(name,verbose)
    tomorse(resolvers.loadtexfile(name),verbose)
end

function morse.showtable()
    context.starttabulate { "|l|l|" } -- { "|l|l|l|" }
    for k, v in table.sortedpairs(codes) do
        context.NC() context(k)
     -- context.NC() context(v)
        context.NC() tomorse(v,true)
        context.NC() context.NR()
    end
    context.stoptabulate()
end

\stopluacode

\unprotect

% todo: \setupmorse, but probably it's not worth the trouble.

\def\MorseWidth             {0.4em}
\def\MorseHeight            {0.2em}
%def\MorseShort             {\dontleavehmode\blackrule[\c!height=\MorseHeight,\c!width=\dimexpr\MorseWidth]}
%def\MorseLong              {\dontleavehmode\blackrule[\c!height=\MorseHeight,\c!width=3\dimexpr\MorseWidth]}
\def\MorseShort             {\dontleavehmode\vrule\!!width \dimexpr\MorseWidth\!!height\MorseHeight\!!depth\zeropoint\relax}
\def\MorseLong              {\dontleavehmode\vrule\!!width3\dimexpr\MorseWidth\!!height\MorseHeight\!!depth\zeropoint\relax}
\def\MorseBetweenCharacters {\kern\MorseWidth}
\def\MorseBetweenWords      {\hskip3\dimexpr\MorseWidth\relax}
\def\MorseSpace             {\hskip7\dimexpr\MorseWidth\relax}
\def\MorseUnknown      #text{[\detokenize{#text}]}

\unexpanded\def\MorseCode      #text{\ctxlua{moduledata.morse.tomorse(\!!bs#text\!!es,true)}}
\unexpanded\def\MorseString    #text{\ctxlua{moduledata.morse.tomorse(\!!bs#text\!!es)}}
\unexpanded\def\MorseFile      #text{\ctxlua{moduledata.morse.filetomorse("#text")}}
\unexpanded\def\MorseTable          {\ctxlua{moduledata.morse.showtable()}}

\let\Morse     \MorseString

%def\MorseShort             {·}
%def\MorseLong              {—}

\protect

\continueifinputfile{m-morse.mkvi}

\starttext

\MorseTable

\startlines
\MorseCode{—·—· ——— —· — · —··— —+—— —·— ·· ···—}
\MorseCode{—·—· ——— —· — · —··— — + —— —·— ·· ···—}
\Morse{ÀÁÂÃÄÅàáâãäå}
\Morse{ÆÇæç}
\Morse{ÈÉÊËèéêë}
\Morse{ÌÍÎÏìíîï}
\Morse{Ññ}
\Morse{ÒÓÔÕÖòóôõö}
\Morse{Øø}
\Morse{ÙÚÛÜùúû}
\Morse{Ýýÿ}
\Morse{ß}
\Morse{Ţţ}
\stoplines

\Morse{A B C D E F G H I J K L M N O P Q R S T U V W X Y Z}

\stoptext