Module:Coordinates

--[[ This module is intended to replace the functionality of °N, °W and related templates. It provides several methods, including

coordinate values.

degree values to DMS format.

to decimal degree format.

]]

math_mod = require( "Module:Math" ); globalFrame = nil

coordinates = {};

-- Helper function, replacement for function displaytitle (s, notes) local l = "Coordinates: " .. s   local co = ' ' .. l .. notes .. ' ';   return ' ' .. co .. ' '; end

-- Helper function, Replacement for function displayinline (s, notes) return s .. notes end

-- Helper function, used in detecting DMS formatting local dmsTest = function(first, second) local concatenated = first:upper .. second:upper; if concatenated == "NE" or concatenated == "NW" or concatenated == "SE" or concatenated == "SW" or       concatenated == "EN" or concatenated == "WN" or concatenated == "ES" or concatenated == "WS" then return true; end return false; end

--[[ parseDec

Transforms decimal format latitude and longitude into the a structure to be used in displaying coordinates ]] function parseDec( lat, long, format ) local coordinateSpec = {} local errors = {} if long == "" or long == nil then return nil, 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)  -- coordinateSpec["dms-long"] = convert_dec2dms( long, "E", "W", mode) -- if format ~= "" then coordinateSpec.default = format else coordinateSpec.default = "dec" end

return coordinateSpec, errors end

-- Helper function, handle optional args. function optionalArg(arg, suplement) if arg ~= nil and arg ~= "" then return arg .. suplement end return "" end

--[[ parseDMS

Transforms degrees, minutes, seconds format latitude and longitude into the a structure to be used in displaying coordinates ]] function parseDMS( lat_d, lat_m, lat_s, lat_f, long_d, long_m, long_s, long_f, format ) local coordinateSpec = {} local errors = {} lat_f = lat_f:upper; long_f = long_f:upper; -- Check if specified backward if lat_f == 'E' or lat_f == 'W' then local t_d, t_m, t_s, t_f; t_d = lat_d; t_m = lat_m; t_s = lat_s; t_f = lat_f; lat_d = long_d; lat_m = long_m; lat_s = long_s; lat_f = long_f; long_d = t_d; long_m = t_m; long_s = t_s; long_f = t_f; end errors = validate( lat_d, lat_m, lat_s, long_d, long_m, long_s, 'parseDMS', true ); if long_d == nil or long_d == "" then table.insert(errors, {"parseDMS", "Missing longitude" }) 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) -- coordinateSpec["dec-long"] = convert_dms2dec(long_f, long_d, long_m, long_s) --

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

return coordinateSpec, errors end

--[[ specPrinter

Output formatter. Takes the structure generated by either parseDec or parseDMS and formats it for inclusion on Wikipedia. ]] 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 = '' .. ' ' .. coordinateSpec["dms-lat"] .. ' '            .. ' ' ..coordinateSpec["dms-long"] .. ' '            .. ' '

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 local geodechtml = '' .. geodeclat .. ' '            .. geodeclong .. ' '

local geonumhtml = ' ' .. coordinateSpec["dec-lat"] .. '; '            .. coordinateSpec["dec-long"] .. ' '

local inner; inner = '' .. geodmshtml .. ' '               .. ' &#xfeff; / &#xfeff; ' .. '';

if args["name"] == "" or args["name"] == nil then inner = inner .. geodechtml .. ' &#xfeff; / ' .. geonumhtml .. ' '    else inner = inner .. ' ' .. geodechtml .. ' &#xfeff; / ' .. geonumhtml .. ' '               .. ' &#xfeff; ( '                .. args["name"] .. ' )   ' end

return ' ' .. globalFrame:preprocess(       '[//toolserver.org/~geohack/geohack.php?pagename=&params=' ..        uriComponents .. ' ' .. inner .. ']') .. ' ' end

-- Formats any error messages generated for display function errorPrinter(errors) local result = "" for i,v in ipairs(errors) do       local errorHTML = ' Coordinates: ' .. v[2] .. ' '       result = result .. errorHTML .. " "   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 °N, °W 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 input arguments for coord to determine the kind of data being provided and then make the necessary processing. function formatTest(args) local result, errors; local primary = false; if args[1] == "" then -- no lat logic return errorPrinter 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] }, '_' ); if args[10] ~= '' then table.insert( errors, { 'formatTest', 'Extra unexpected parameters' } ); end 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] }, '_' ); if args[8] ~= '' then table.insert( errors, { 'formatTest', 'Extra unexpected parameters' } ); end 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] }, '_' ); if args[6] ~= '' then table.insert( errors, { 'formatTest', 'Extra unexpected parameters' } ); end else -- Error return errorPrinter end result.name    = args["name"] local extra_param = {'dim', 'globe', 'scale', 'region', 'source', 'type'} for _, v in ipairs( extra_param ) do       if (args[v] or ) ~=  then table.insert( errors, {'formatTest', 'Parameter: "' .. v .. '=" should be "' .. v .. ':"' } ); end end if #errors == 0 then return specPrinter( args, result ) else return specPrinter( args, result ) .. " " .. errorPrinter(errors) .. '';    end end

-- Helper function, convert decimal latitude or longitude to degrees, minutes, and seconds format based on the specified precision. function convert_dec2dms(coordinate, firstPostfix, secondPostfix, precision) local coord = tonumber(coordinate) or 0 local postfix if coord >= 0 then postfix = firstPostfix else postfix = secondPostfix end

precision = precision:lower; 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 end

-- Helper function, convert decimal to degrees function convert_dec2dms_d(coordinate) local d = math_mod._round( coordinate, 0 ) .. "°"   return d .. "" end

-- Helper function, convert decimal to degrees and minutes 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

-- Helper function, convert decimal to degrees, minutes, and seconds 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 DMS format into a N or E decimal coordinate 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 local factor if direction == "N" or direction == "E" then factor = 1 else factor = -1 end local precision = 0 if seconds_str ~= nil and seconds_str ~= '' then precision = 5 + math.max( math_mod._precision(seconds_str), 0 ); elseif minutes_str ~= nil and minutes_str ~= '' then precision = 3 + math.max( math_mod._precision(minutes_str), 0 ); else precision = math.max( math_mod._precision(degrees_str), 0 ); end local decimal = factor * (degrees+(minutes+seconds/60)/60) return string.format( "%." .. precision .. "f", decimal ) -- not tonumber since this whole thing is string based. end

-- Checks input values to for out of range errors. 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_m ) or 0; lat_s = tonumber( lat_s ) 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 < 0 then table.insert(errors, {source, "longitude degrees < 0 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 < 0"}) 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

--[[ dec2dms

Wrapper to allow templates to call dec2dms directly.

Usage: decimal_coordinate is converted to DMS format. If positive, the positive_suffix is appended (typical N or E), if negative, the negative suffix is appended. The specified precision is one of 'D', 'DM', or 'DMS' to specify the level of detail to use. ]] 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

-- Helper function to determine whether to use D, DM, or DMS format depending on the precision of the decimal input. 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

--[[ dms2dec

Wrapper to allow templates to call dms2dec directly.

Usage: Converts DMS values specified as degrees, minutes, seconds too decimal format. direction_flag is one of N, S, E, W, and determines whether the output is positive (i.e. N and E) or negative (i.e. S and W). ]] 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

--[[ coord

Main entry point for Lua function to replace °N, °W

Usage: ...   Refer to °N, °W documentation page for many additional parameters and configuration options. Note: This function provides the visual display elements of °N, °W. In order to load coordinates into the database, the parser function must also be called, this is done automatically in the Lua version of °N, °W. ]] function coordinates.coord(frame) globalFrame = frame local args = frame.args if args[1] == nil then local pFrame = frame:getParent; args = pFrame.args; for k,v in pairs( frame.args ) do           args[k] = v;        end end 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") if Display == '' then Display = 'inline'; end local text = '' if string.find( Display, 'inline' ) ~= nil or Display == 'i' or            Display == 'it' or Display == 'ti' then text = displayinline(contents, Notes) end if string.find( Display, 'title' ) ~= nil or Display == 't' or            Display == 'it' or Display == 'ti' then text = text .. displaytitle(contents, Notes) end return text end

return coordinates