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annotate MakeWaypoints.kt @ 9:a56d3d3b5efd

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Reject out of range latitide and longitide values.
author David Barts <n5jrn@me.com>
date Wed, 25 Aug 2021 08:45:36 -0700
parents 290b0b2a584b
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Make waypoints. In Kotlin, because the JVM has a uniquely non-sucky
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3 * way to write XML.
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4 */
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5
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6 import javax.xml.stream.*
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7 import java.io.FileOutputStream
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8 import java.text.SimpleDateFormat
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9 import java.util.Date
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10 import java.util.TimeZone
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11 import kotlin.math.abs
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13 private const val MYNAME = "MakeWaypoints"
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14 private const val CHARSET = "UTF-8"
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15 private val WP_TIME_FORMAT = SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'").apply {
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16 timeZone = TimeZone.getTimeZone("GMT")
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17 }
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18
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19 fun main(args: Array<String>): Unit {
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20 /* parse arguments */
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21 val syntaxError = "${MYNAME}: syntax: [-latfirst] file"
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22 if (args.size < 1 || args.size > 2) {
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23 System.err.println(syntaxError)
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24 System.exit(2)
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25 }
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26 var latFirst = false
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27 var fileArg = 0
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28 if (args[0].startsWith('-')) {
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29 latFirst = args[0].equals("-latfirst", ignoreCase = true)
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30 if (!latFirst || args.size != 2) {
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31 System.err.println(syntaxError)
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32 System.exit(2)
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33 }
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34 fileArg = 1
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35 }
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36 if (args.size != fileArg + 1) {
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37 System.err.println(syntaxError)
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38 System.exit(2)
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39 }
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40 val outName = args[fileArg]
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41
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42 /* explain purpose */
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43 println("Enter waypoints below, end with empty line.")
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44 println()
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46 /* process input from user */
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47 val invalid = "${MYNAME}: invalid entry, please try again"
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48 FileOutputStream(outName).use stream@{
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49 XMLOutputFactory.newInstance().createXMLStreamWriter(it, CHARSET).run {
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50 writeStartDocument(CHARSET, "1.0")
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51 writeStartElement("gpx")
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52 writeAttribute("creator", "MakeWaypoints")
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53 writeAttribute("version", "1.1")
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54 writeDefaultNamespace("http://www.topografix.com/GPX/1/1")
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55
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56 while (true) {
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57 if (latFirst)
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58 print("Latitude, longitude: ")
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59 else
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60 print("Longitude, latitude: ")
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61 val longLat = readLine()
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62 if (longLat.isNullOrEmpty()) {
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63 writeEndDocument()
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64 close()
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65 return@stream
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66 }
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67 val parts = longLat.split(',')
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68 if (parts.size != 2) {
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69 System.err.println(invalid)
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70 continue
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71 }
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72 val (lat, long) = if (latFirst)
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73 Pair(parts[0].trim(), parts[1].trim())
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74 else
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75 Pair(parts[1].trim(), parts[0].trim())
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76 val dLat = lat.toDoubleOrNull()
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77 val dLong = long.toDoubleOrNull()
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78 if (dLat == null || abs(dLat) > 90.0 || dLong == null || abs(dLong) > 180.0) {
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79 System.err.println(invalid)
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80 continue
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81 }
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82 print("Name: ")
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83 val name = readLine()
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84 if (name.isNullOrEmpty()) {
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85 System.err.println(invalid)
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86 continue
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87 }
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88 writeStartElement("wpt")
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89 writeAttribute("lat", lat)
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90 writeAttribute("lon", long)
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91 writeStartElement("time")
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92 writeCharacters(WP_TIME_FORMAT.format(Date()))
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93 writeEndElement()
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94 writeStartElement("name")
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95 writeCharacters(name)
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96 writeEndElement()
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97 writeEndElement()
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98 }
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99 }
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100 }
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101 }