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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,128 @@ | ||
| import 'dart:io'; | ||
| import 'package:file_picker/file_picker.dart'; | ||
| import 'package:flutter/foundation.dart'; | ||
| import 'package:flutter/services.dart'; | ||
| import 'package:path_provider/path_provider.dart'; | ||
|
|
||
| class ParseCSV { | ||
| String _pathName = "Unnamed Path"; | ||
|
|
||
| Future<(List<List<dynamic>>, String)> readCSV(String path, String source) async { | ||
| String csvData = await _loadCSVData(path, source); | ||
| final lines = csvData.split('\n'); | ||
| if (kDebugMode) { | ||
| print(lines); | ||
| } | ||
|
|
||
| return (_processLines(lines), _pathName); | ||
| } | ||
|
|
||
| Future<String> _loadCSVData(String path, String source) async { | ||
| if (source == "asset") { | ||
| return await rootBundle.loadString(path); | ||
| } else { | ||
| final file = File(path); | ||
| return await file.readAsString(); | ||
| } | ||
| } | ||
|
|
||
| List<List<dynamic>> _processLines(List<String> lines) { | ||
| List<List<dynamic>> data = []; | ||
| for (var line in lines) { | ||
| if (_isPathNameLine(line)) { | ||
| _pathName = line.substring(2).trim(); | ||
| continue; | ||
| } | ||
|
|
||
| if (_isCommentOrEmpty(line)) { | ||
| continue; | ||
| } | ||
|
|
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| var row = _processRow(line); | ||
| if (row != null) { | ||
| data.add(row); | ||
| } | ||
| } | ||
| return data; | ||
| } | ||
|
|
||
| bool _isPathNameLine(String line) => line.trim().startsWith('##'); | ||
|
|
||
| bool _isCommentOrEmpty(String line) => line.trim().isEmpty || line.trim().startsWith('#'); | ||
|
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| List<dynamic>? _processRow(String line) { | ||
| List<dynamic> row = line.split(','); | ||
| if (row.length >= 4) { | ||
| return [ | ||
| row[0], | ||
| double.tryParse(row[1]) ?? 0.0, | ||
| double.tryParse(row[2]) ?? 0.0, | ||
| double.tryParse(row[3]) ?? 0.0 | ||
| ]; | ||
| } | ||
| return null; | ||
| } | ||
|
|
||
| Future<void> importCSV() async { | ||
| FilePickerResult? result = await FilePicker.platform.pickFiles( | ||
| type: FileType.custom, | ||
| allowedExtensions: ['csv'], | ||
| ); | ||
|
|
||
| if (result != null) { | ||
| File file = File(result.files.single.path!); | ||
| if (await _validateCSV(file)) { | ||
| await _saveFileToAppDirectory(file); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| Future<bool> _validateCSV(File file) async { | ||
| final input = await file.readAsString(); | ||
| final lines = input.split('\n'); | ||
|
|
||
| for (var line in lines) { | ||
| if (_isCommentOrEmpty(line)) { | ||
| continue; | ||
| } | ||
|
|
||
| if (!_isValidCSVRow(line)) { | ||
| return false; | ||
| } | ||
| } | ||
| return true; | ||
| } | ||
|
|
||
| bool _isValidCSVRow(String line) { | ||
| List<dynamic> row = line.split(','); | ||
| return row.length == 4 && | ||
| _isValidDouble(row[1], -90, 90) && | ||
| _isValidDouble(row[2], -180, 180) && | ||
| _isValidDouble(row[3], 0, double.infinity); | ||
| } | ||
|
|
||
| bool _isValidDouble(String value, double min, double max) { | ||
| double? val = double.tryParse(value); | ||
| return val != null && val >= min && val <= max; | ||
| } | ||
|
|
||
| Future<void> _saveFileToAppDirectory(File file) async { | ||
| Directory appDocDir = await getApplicationDocumentsDirectory(); | ||
| String baseFilePath = '${appDocDir.path}/${file.uri.pathSegments.last}'; | ||
| String newFilePath = baseFilePath; | ||
|
|
||
| int counter = 2; | ||
| while (File(newFilePath).existsSync()) { | ||
| newFilePath = _appendNumberSuffix(baseFilePath, counter); | ||
| counter++; | ||
| } | ||
|
|
||
| await file.copy(newFilePath); | ||
| } | ||
|
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| String _appendNumberSuffix(String filePath, int counter) { | ||
| String extension = filePath.substring(filePath.lastIndexOf('.')); | ||
| String pathWithoutExtension = filePath.substring(0, filePath.lastIndexOf('.')); | ||
| return '${pathWithoutExtension}_$counter$extension'; | ||
| } | ||
| } |
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