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chore: Initial commit
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01XPovRHpejR4zRxuhjY4Qs3
This commit is contained in:
Janez Troha
219
lib/utils/sar_message_parser.dart
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219
lib/utils/sar_message_parser.dart
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import 'dart:convert';
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import 'package:latlong2/latlong.dart';
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import '../models/map_coordinate_space.dart';
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import '../models/message.dart';
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import '../models/sar_marker.dart';
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import 'custom_map_id.dart';
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class SarMessageParser {
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static const String legacyPrefix = 'S:';
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static const String customMapPrefix = 'S2:';
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static final RegExp _sarPatternNew = RegExp(
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r'^S:([^:]+):(\d):(-?\d+\.?\d*),(-?\d+\.?\d*):?(.*)',
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multiLine: false,
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);
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static final RegExp _sarPatternOld = RegExp(
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r'^S:([^:]+):(-?\d+\.?\d*),(-?\d+\.?\d*):?(.*)',
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multiLine: false,
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);
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static bool isSarMessage(String text) {
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final lines = text.trim().split('\n');
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final firstLine = lines.isEmpty ? text.trim() : lines.first;
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return firstLine.startsWith(legacyPrefix) ||
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firstLine.startsWith(customMapPrefix);
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}
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static SarMarkerInfo? parse(String text) {
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final trimmed = text.trim();
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if (trimmed.startsWith(customMapPrefix)) {
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return _parseCustomMap(trimmed);
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}
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if (!trimmed.startsWith(legacyPrefix)) {
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return null;
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}
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final firstLine = trimmed.split('\n').first;
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var match = _sarPatternNew.firstMatch(firstLine);
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final isNewFormat = match != null;
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match ??= _sarPatternOld.firstMatch(firstLine);
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if (match == null) return null;
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try {
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final emoji = match.group(1)!;
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final colorIndex = isNewFormat ? int.parse(match.group(2)!) : null;
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final latitude = double.parse(match.group(isNewFormat ? 3 : 2)!);
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final longitude = double.parse(match.group(isNewFormat ? 4 : 3)!);
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final inlineMessage = match.group(isNewFormat ? 5 : 4)?.trim();
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if (latitude < -90 || latitude > 90) return null;
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if (longitude < -180 || longitude > 180) return null;
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final additionalNotes = extractNotes(text);
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String? notes;
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if (inlineMessage != null && inlineMessage.isNotEmpty) {
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notes = inlineMessage;
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}
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if (additionalNotes != null && additionalNotes.isNotEmpty) {
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notes = notes != null ? '$notes\n$additionalNotes' : additionalNotes;
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}
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return SarMarkerInfo(
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type: SarMarkerType.fromEmoji(emoji),
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location: LatLng(latitude, longitude),
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emoji: emoji,
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notes: notes,
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colorIndex: colorIndex != null && colorIndex >= 0 && colorIndex <= 7
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? colorIndex
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: null,
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coordinateSpace: MapCoordinateSpace.geo,
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);
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} catch (_) {
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return null;
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}
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}
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static SarMarkerInfo? _parseCustomMap(String text) {
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try {
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final json =
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jsonDecode(text.substring(customMapPrefix.length))
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as Map<String, dynamic>;
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final emoji = json['e'];
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final mapId = normalizeCustomMapId(json['m'] as String?);
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final rawPoint = json['p'];
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if (emoji is! String || mapId == null || rawPoint is! List) {
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return null;
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}
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final point = rawPoint.cast<num>();
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if (point.length != 2) return null;
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final colorIndex = json['c'];
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final notes = json['n'];
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return SarMarkerInfo(
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type: SarMarkerType.fromEmoji(emoji),
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location: LatLng(point[0].toDouble(), point[1].toDouble()),
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emoji: emoji,
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notes: notes is String && notes.isNotEmpty ? notes : null,
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colorIndex: colorIndex is int ? colorIndex : null,
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coordinateSpace: MapCoordinateSpace.customMap,
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mapId: mapId,
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);
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} catch (_) {
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return null;
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}
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}
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static Message enhanceMessage(Message message) {
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final sarInfo = parse(message.text);
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if (sarInfo == null) return message;
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return message.copyWith(
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isSarMarker: true,
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sarGpsCoordinates: sarInfo.coordinateSpace == MapCoordinateSpace.geo
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? sarInfo.location
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: null,
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sarCustomMapPoint: sarInfo.coordinateSpace == MapCoordinateSpace.customMap
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? sarInfo.location
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: null,
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sarCustomMapId: sarInfo.mapId,
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sarNotes: sarInfo.notes,
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sarCustomEmoji: sarInfo.emoji,
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sarColorIndex: sarInfo.colorIndex,
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);
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}
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static String createSarMessage({
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required SarMarkerType type,
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required LatLng location,
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String? notes,
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int? colorIndex,
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}) {
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final colorIdx = colorIndex ?? 0;
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final text =
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'S:${type.emoji}:$colorIdx:${location.latitude},${location.longitude}';
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if (notes != null && notes.isNotEmpty) {
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return '$text:$notes';
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}
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return text;
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}
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static String createCustomMapSarMessage({
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required String emoji,
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required String mapId,
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required LatLng point,
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String? notes,
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int? colorIndex,
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}) {
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final payload = <String, dynamic>{
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'e': emoji,
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'c': colorIndex ?? 0,
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'm': normalizeCustomMapId(mapId),
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'p': [point.latitude.round(), point.longitude.round()],
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};
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if (notes != null && notes.isNotEmpty) {
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payload['n'] = notes;
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}
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return '$customMapPrefix${jsonEncode(payload)}';
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}
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static String? extractNotes(String text) {
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final trimmed = text.trim();
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final lines = trimmed.split('\n');
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if (lines.length <= 1) return null;
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return lines.sublist(1).join('\n').trim();
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}
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static bool isValidFormat(String text) {
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return isSarMessage(text) && parse(text) != null;
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}
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static String? getFormatError(String text) {
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final trimmed = text.trim();
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if (trimmed.startsWith(customMapPrefix)) {
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return parse(text) == null
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? 'Invalid format for custom map SAR marker'
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: null;
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}
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if (!trimmed.startsWith(legacyPrefix)) {
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return 'SAR message must start with "S:"';
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}
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final firstLine = trimmed.split('\n').first;
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if (firstLine == legacyPrefix) {
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return 'Invalid format for SAR marker';
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}
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final parts = firstLine.split(':');
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if (parts.length < 2 || parts[1].isEmpty) {
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return 'Missing emoji';
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}
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return parse(text) == null ? 'Invalid format for SAR marker' : null;
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}
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}
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class SarMarkerInfo {
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final SarMarkerType type;
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final LatLng location;
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final String emoji;
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final String? notes;
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final int? colorIndex;
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final MapCoordinateSpace coordinateSpace;
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final String? mapId;
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SarMarkerInfo({
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required this.type,
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required this.location,
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required this.emoji,
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this.notes,
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this.colorIndex,
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required this.coordinateSpace,
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this.mapId,
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});
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@override
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String toString() {
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return 'SarMarkerInfo(type: ${type.displayName}, location: $location, colorIndex: $colorIndex, space: ${coordinateSpace.name}, mapId: $mapId)';
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}
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}
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