Module:Coordinates

Documentation for this module may be created at Module:Coordinates/doc

-- A module that mimics the functionality of Template:Coord and its sub templates
-- The attempt is to actually mimic a conversion of an often used en.wp template in the way
-- that most templates will actually be converted by the wiki users. 
-- Attempt is not really to write a nice and proper module from scratch :D
local math_mod = require "Module:Math";

globalFrame = nil
coordinates = {};

--- Replacement for {{coord/display/title}}
function displaytitle (s)
    local l = "[[Geographic coordinate system|Coordinates]]: " .. s
    local co = '<span id="coordinates">' .. l .. '</span>';
    return '<span style="font-size: small;">' .. co .. '</span>';
end

--- Replacement for {{coord/display/inline}}
function displayinline (s)
    return s    
end

--- Test if the arguments imply that DMS might be in use
local dmsTest = function(first, second)
    local concatenated = first .. second;
    
    if concatenated == "NE" or concatenated == "NW" or concatenated == "SE" or concatenated == "SW" then
        return true;
    end
    return false;
end

--- Parse the frame assuming that it is in dec format.
-- @frame
-- @returns a table with all information needed to display coordinates
function parseDec( lat, long, format )
    local coordinateSpec = {}
    local errors = {}
    
    if long == "" or long == nil then
        return nil, {{"parseDec", "Missing longitude"}}
    end
    
    errors = validate( lat, nil, nil, long, nil, nil, 'parseDec', false );    
    coordinateSpec["dec-lat"]  = lat;
    coordinateSpec["dec-long"] = long;

    local mode = coordinates.determineMode( lat, long );
    coordinateSpec["dms-lat"]  = convert_dec2dms( lat, "N", "S", mode)  -- {{coord/dec2dms|{{{1}}}|N|S|{{coord/prec dec|{{{1}}}|{{{2}}}}}}}
    coordinateSpec["dms-long"] = convert_dec2dms( long, "E", "W", mode)  -- {{coord/dec2dms|{{{2}}}|E|W|{{coord/prec dec|{{{1}}}|{{{2}}}}}}}    
    
    if format ~= "" then
        coordinateSpec.default = format
    else
        coordinateSpec.default = "dec"
    end

    return coordinateSpec, errors
end

function optionalArg(arg, suplement)
    if arg ~= nil and arg ~= "" then
        return arg .. suplement
    end
    return ""
end

function isEmpty(arg)
  if arg == nil or arg == "" then
    return true
  end
  return false
end

function parseDMS( lat_d, lat_m, lat_s, lat_f, long_d, long_m, long_s, long_f, format )
    local coordinateSpec = {}
    local errors = {}
    
    errors = validate( lat_d, lat_m, lat_s, long_d, long_m, long_s, 'parseDMS', true );
    if isEmpty(long_d) then
        table.insert(errors, {"parseDMS", "Missing longitude" })
    end
    if tonumber(lat_d) < 0 then
        table.insert( errors, { 'parseDMS', 'Invalid latitude' } );
    end
    
    if lat_m == nil and lat_s == nil and long_m == nil and long_s == nil and #errors == 0 then 
        if math_mod._precision( lat_d ) > 0 or math_mod._precision( long_d ) > 0 then
            if lat_f:upper() == 'S' then 
                lat_d = '-' .. lat_d;
            end
            if long_f:upper() == 'W' then 
                long_d = '-' .. long_d;
            end     
            
            return parseDec( lat_d, long_d, format );
        end        
    end   
    
    coordinateSpec["dms-lat"]  = lat_d.."°"..optionalArg(lat_m,"′") .. optionalArg(lat_s,"″") .. lat_f
    coordinateSpec["dms-long"] = long_d.."°"..optionalArg(long_m,"′") .. optionalArg(long_s,"″") .. long_f
    coordinateSpec["dec-lat"]  = convert_dms2dec(lat_f, lat_d, lat_m, lat_s) -- {{coord/dms2dec|{{{4}}}|{{{1}}}|0{{{2}}}|0{{{3}}}}}
    coordinateSpec["dec-long"] = convert_dms2dec(long_f, long_d, long_m, long_s) -- {{coord/dms2dec|{{{8}}}|{{{5}}}|0{{{6}}}|0{{{7}}}}}

    if format ~= "" then
        coordinateSpec.default = format
    else
        coordinateSpec.default = "dms"
    end
    

    return coordinateSpec, errors
end

--- A function that prints a table of coordinate specifications to HTML
function specPrinter(args, coordinateSpec)
    local uriComponents = coordinateSpec["param"]
    if uriComponents == "" then
        -- RETURN error, should never be empty or nil
        return "ERROR param was empty"
    end
    if args["name"] ~= "" and args["name"] ~= nil then
        uriComponents = uriComponents .. "&title=" .. mw.uri.encode(coordinateSpec["name"])
    end
    
    local geodmshtml = '<span class="geo-dms" title="Maps, aerial photos, and other data for this location">'
             .. '<span class="latitude">' .. coordinateSpec["dms-lat"] .. '</span> '
             .. '<span class="longitude">' ..coordinateSpec["dms-long"] .. '</span>'
             .. '</span>'

    local lat = tonumber( coordinateSpec["dec-lat"] ) or 0
    if lat < 0 then
        -- FIXME this breaks the pre-existing precision
        geodeclat = coordinateSpec["dec-lat"]:sub(2) .. "°S"
    else
        geodeclat = (coordinateSpec["dec-lat"] or 0) .. "°N"
    end

    local long = tonumber( coordinateSpec["dec-long"] ) or 0
    if long < 0 then
        -- FIXME does not handle unicode minus
        geodeclong = coordinateSpec["dec-long"]:sub(2) .. "°W"
    else
        geodeclong = (coordinateSpec["dec-long"] or 0) .. "°E"
    end
    
    -- TODO requires DEC formatting
    local geodechtml = '<span class="geo-dec" title="Maps, aerial photos, and other data for this location">'
             .. geodeclat .. ' '
             .. geodeclong
             .. '</span>'

    local geonumhtml = '<span class="geo">'
             .. coordinateSpec["dec-lat"] .. '; '
             .. coordinateSpec["dec-long"]
             .. '</span>'

    local inner
    if args["name"] == "" or args["name"] == nil then
        inner = '<span class="' .. displayDefault(coordinateSpec["default"], "dms" ) .. '">' .. geodmshtml .. '</span>'
                .. '<span class="geo-multi-punct">&#xfeff; / &#xfeff;</span>'
                .. '<span class="' .. displayDefault(coordinateSpec["default"], "dec" ) .. '">' .. geodechtml 
                .. '<span style="display:none">&#xfeff; / ' .. geonumhtml .. '</span></span>'
    else
        inner = '<span class="' .. displayDefault(coordinateSpec["default"], "dms" ) .. '">' .. geodmshtml .. '</span>'
                .. '<span class="geo-multi-punct">&#xfeff; / &#xfeff;</span>'
                .. '<span class="' .. displayDefault(coordinateSpec["default"], "dec" ) .. '"><span class="vcard">' .. geodechtml 
                .. '<span style="display:none">&#xfeff; / ' .. geonumhtml .. '</span>'
                .. '<span style="display:none">&#xfeff; (<span class="fn org">'
                .. args["name"] .. '</span>)</span></span></span>'
    end

    return '<span class="plainlinks nourlexpansion">' .. globalFrame:preprocess(
        '[http://toolserver.org/~geohack/geohack.php?pagename={{FULLPAGENAMEE}}&params=' ..
        uriComponents .. ' ' .. inner .. ']') .. '</span>'
end

function errorPrinter(errors)
    local result = ""
    for i,v in ipairs(errors) do
        local errorHTML = '<strong class="error">' .. v[2] .. ' in Module:Coordinates.' .. v[1] .."()" .. '</strong>'
        result = result .. errorHTML .. "<br />"
    end
    return result
end

--- Determine the required CSS class to display coordinates
-- Usually geo-nondefault is hidden by CSS, unless a user has overridden this for himself
-- default is the mode as specificied by the user when calling the {{coord}} template
-- mode is the display mode (dec or dms) that we will need to determine the css class for 
function displayDefault(default, mode)
    if default == "" then
        default = "dec"
    end
    
    if default == mode then
        return "geo-default"
    else
        return "geo-nondefault"
    end
end

--- Check the arguments to determine what type of coordinates has been input
function formatTest(args)
    local result, errors;
    
    if args[1] == "" then
        -- no lat logic
        return errorPrinter( {{"formatTest", "Missing latitude"}} )
    elseif args[4] == "" and args[5] == "" and args[6] == "" then
        -- dec logic
        result, errors = parseDec( args[1], args[2], args['format'] )
        if result == nil then
            return errorPrinter( errors );
        end
        
        result.param    = table.concat( {args[1], "_N_", args[2], "_E_", args[3] } );
    elseif dmsTest(args[4], args[8]) then
        -- dms logic
        result, errors = parseDMS( args[1], args[2], args[3], args[4], 
            args[5], args[6], args[7], args[8], args['format'] )
        result.param = table.concat( { args[1], args[2], args[3], args[4], args[5],
            args[6], args[7], args[8], args[9] } , '_' );
    elseif dmsTest(args[3], args[6]) then
        -- dm logic
        result, errors = parseDMS( args[1], args[2], nil, args[3], 
            args[4], args[5], nil, args[6], args['format'] )
        result.param = table.concat( { args[1], args[2], args[3], args[4], args[5],
            args[6], args[7] } , '_' );
    elseif dmsTest(args[2], args[4]) then
        -- d logic
        result, errors = parseDMS( args[1], nil, nil, args[2], 
            args[3], nil, nil, args[4], args['format'] )
        result.param = table.concat( { args[1], args[2], args[3], args[4], args[5] } , '_' );
    else
        -- Error
        return errorPrinter( {{"formatTest", "Unknown argument format"}} )
    end
    result.name     = args["name"]
    if #errors == 0 then
        return specPrinter( args, result )    
    else
        return specPrinter( args, result ) .. " " .. errorPrinter(errors)    
    end    
end

function convert_dec2dms_d(coordinate)
    local d = math_mod._round( coordinate, 0 ) .. "°"
    return d .. ""
end

function convert_dec2dms_dm(coordinate)    
    coordinate = math_mod._round( coordinate * 60, 0 );
    local m = coordinate % 60;
    coordinate = math.floor( (coordinate - m) / 60 );
    local d = coordinate % 360 .."°"
    
    return d .. string.format( "%02d′", m )
end

function convert_dec2dms_dms(coordinate)
    coordinate = math_mod._round( coordinate * 60 * 60, 0 );
    local s = coordinate % 60
    coordinate = math.floor( (coordinate - s) / 60 );
    local m = coordinate % 60
    coordinate = math.floor( (coordinate - m) / 60 );
    local d = coordinate % 360 .."°"

    return d .. string.format( "%02d′", m ) .. string.format( "%02d″", s )
end

--- Convert a latitude or longitude to the DMS format
function convert_dec2dms(coordinate, firstPostfix, secondPostfix, precision)
    -- {{Coord/dec2dms/{{{4}}}|{{#ifexpr:{{{1}}} >= 0||-}}{{{1}}}}}{{#ifexpr:{{{1}}} >= 0|{{{2}}}|{{{3}}}}}
    local coord = tonumber(coordinate) or 0
    local postfix
    if coord >= 0 then
        postfix = firstPostfix
    else
        postfix = secondPostfix
    end

    if precision == "dms" then
        return convert_dec2dms_dms( math.abs( coord ) ) .. postfix;
    elseif precision == "dm" then
        return convert_dec2dms_dm( math.abs( coord ) ) .. postfix;
    elseif precision == "d" then
        return convert_dec2dms_d( math.abs( coord ) ) .. postfix;
    end
    
    -- return "" .. globalFrame:expandTemplate{ title = 'coord/dec2dms', args = {coordinate, firstPostfix, secondPostfix, precision}}
end

--- Convert DMS into a N or E decimal coordinate
-- @param coordinate direction. either "N" "S" "E" or "W"
-- @param degrees: string or number
-- @param minutes: string or number
-- @param seconds: string or number
-- @return a number with the N or E normalized decimal coordinate of the input
function convert_dms2dec(direction, degrees_str, minutes_str, seconds_str)
    local degrees = tonumber(degrees_str) or 0
    local minutes = tonumber(minutes_str) or 0
    local seconds = tonumber(seconds_str) or 0
    -- {{#expr:{{#switch:{{{1}}}|N|E=1|S|W=-1}}*({{{2|0}}}+({{{3|0}}}+{{{4|0}}}/60)/60) round {{{precdec|{{#if:{{{4|}}}|5|{{#if:{{{3|}}}|3|0}}}}+{{precision1|{{{4|{{{3|{{{2}}}}}}}}}}}}}}}} 
    
    local factor
    if direction == "N" or direction == "E" then
        factor = 1
    else
        factor = -1
    end
    
    local precision = 0
    if not isEmpty(seconds_str) then
        precision = 5 + math.max( math_mod._precision(seconds_str), 0 );
    elseif not isEmpty(minutes_str) then
        precision = 3 + math.max( math_mod._precision(minutes_str), 0 );
    else
        precision = math.max( math_mod._precision(degrees_str), 0 );
    end
    
    -- nil -> 0
    local decimal = factor * (degrees+(minutes+seconds/60)/60) 
    return string.format( "%." .. precision .. "f", decimal ) -- not tonumber since this whole thing is string based.
    
    --return "" .. globalFrame:expandTemplate{ title = 'coord/dms2dec', args = {direction, degrees, minutes, seconds}}
end

function validate( lat_d, lat_m, lat_s, long_d, long_m, long_s, source, strong )
    local errors = {};
    lat_d = tonumber( lat_d ) or 0;
    lat_m = tonumber( lat_d ) or 0;
    lat_s = tonumber( lat_d ) or 0;
    long_d = tonumber( long_d ) or 0;
    long_m = tonumber( long_m ) or 0;
    long_s = tonumber( long_s ) or 0;

    if strong then
        if lat_d < 0 then
            table.insert(errors, {source, "latitude degrees < 0 with hemisphere flag"})
        end
        if long_d < -180 then
            table.insert(errors, {source, "longitude degrees < -180 with hemisphere flag"})
        end
        if long_d > 180 then
            table.insert(errors, {source, "longitude degrees > 180 with hemisphere flag"})
        end
    end    
        
    if lat_d > 90 then
        table.insert(errors, {source, "latitude degrees > 90"})
    end
    if lat_d < -90 then
        table.insert(errors, {source, "latitude degrees < -90"})
    end
    if lat_m >= 60 then
        table.insert(errors, {source, "latitude minutes >= 60"})
    end
    if lat_m < 0 then
        table.insert(errors, {source, "latitude minutes < 60"})
    end
    if lat_s >= 60 then
        table.insert(errors, {source, "latitude seconds >= 60"})
    end
    if lat_s < 0 then
        table.insert(errors, {source, "latitude seconds < 0"})
    end
    if long_d >= 360 then
        table.insert(errors, {source, "longitude degrees >= 360"})
    end
    if long_d <= -360 then
        table.insert(errors, {source, "longitude degrees <= -360"})
    end
    if long_m >= 60 then
        table.insert(errors, {source, "longitude minutes >= 60"})
    end
    if long_m < 0 then
        table.insert(errors, {source, "longitude minutes < 0"})
    end
    if long_s >= 60 then
        table.insert(errors, {source, "longitude seconds >= 60"})
    end
    if long_s < 0 then
        table.insert(errors, {source, "longitude seconds < 0"})
    end
    
    return errors;
end


--- The display function we exposed to Module:Coordinates
function coordinates.input(frame)
    globalFrame = frame;
    return formatTest(frame.args)
end

--- The dec2dms function exposed to Module:Coordinates
function coordinates.dec2dms(frame)
    globalFrame = frame
    local coordinate = frame.args[1]
    local firstPostfix = frame.args[2]
    local secondPostfix = frame.args[3]
    local precision = frame.args[4]

    return convert_dec2dms(coordinate, firstPostfix, secondPostfix, precision)
end

function coordinates.determineMode( value1, value2 )
    local precision = math.max( math_mod._precision( value1 ), math_mod._precision( value2 ) );
    if precision <= 0 then
        return 'd'
    elseif precision <= 2 then
        return 'dm';
    else
        return 'dms';
    end
end        

--- The dec2dms function exposed to Module:Coordinates
function coordinates.dms2dec(frame)
    globalFrame = frame
    local direction = frame.args[1]
    local degrees = frame.args[2]
    local minutes = frame.args[3]
    local seconds = frame.args[4]

    return convert_dms2dec(direction, degrees, minutes, seconds)
end

--- This is used by {{coord}}.
function coordinates.coord(frame)
    globalFrame = frame
    local args = frame.args
    for i=1,10 do 
        if args[i] == nil then 
            args[i] = ""
        else
            args[i] = args[i]:match( '^%s*(.-)%s*$' );  --remove whitespace
        end        
    end
    args['format'] = args['format'] or '';
    
    local contents = formatTest(args)
    local Notes = args.notes or ""
    local Display = string.lower(args.display or "inline")
    local text = ''
    if string.find( Display, 'inline' ) ~= nil then
        text = text .. displayinline(contents)
    end
    if string.find( Display, 'title' ) ~= nil then
        text = text .. displaytitle(contents)
    end
    return text .. Notes
end

return coordinates