support multiline comment in the fields

CHANGELOG.md

@@ -1,3 +1,19 @@
+## 0.2.6
+
+- `pubspec.yaml`
+  - update version of package [petitparser]
+- `graph.dart`
+  - new [_preprocessTurtleContent] method to to handle multiline string literals
+  - update [parseTurtle] to work when the content with multiline comments
+- Examples
+  - add a example to parse files with multiline field
+
+
+## 0.2.5
+
+- `pubspec.yaml`
+  - update version of package [http]
+
 ## 0.2.4
 
 - `graph.dart`

example/example_5.dart

@@ -0,0 +1,27 @@
+import 'dart:io';
+
+import 'package:rdflib/rdflib.dart';
+
+main() async {
+  String filePath = 'example/sample_ttl_5.ttl';
+  // Read file content to a local String
+  String fileContents = await File(filePath).readAsStringSync();
+
+  print('-------Original file-------\n$fileContents');
+
+  // create a graph to read turtle file and store info
+  Graph g = Graph();
+
+  // Parse with the new method [Graph.parseTurtle] instead of [Graph.parse] (deprecated)
+  g.parseTurtle(fileContents);
+
+  // Serialize the Graph for output
+  g.serialize(format: 'ttl', abbr: 'short');
+  print('-------Serialized String--------\n${g.serializedString}');
+
+  // Print out full format of triples (will use shorthand in serialization/export)
+  print('--------All triples in the graph-------');
+  for (Triple t in g.triples) {
+    print(t);
+  }
+}

example/sample_ttl_5.ttl

@@ -0,0 +1,11 @@
+@prefix owl: <http://www.w3.org/2002/07/owl#> .
+@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
+@prefix sh_data: <http://yarrabah.net/data/solid-health#> .
+@prefix sh_onto: <http://sii.cecs.anu.edu.au/onto/solid-health#> .
+@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
+sh_data:Info-17809g89a a sh_onto:InfoTab,
+        owl:NamedIndividual ;
+    rdfs:label "label_name"^^xsd:string ;
+    sh_onto:commentP """1. First comment.
+2. Second comment.
+3. Third comment."""^^xsd:string .

lib/src/graph.dart

@@ -63,7 +63,7 @@ class Graph {
   ///   print(t);
   /// }
   /// ```
-  void  addTripleToGroups(dynamic s, dynamic p, dynamic o) {
+  void addTripleToGroups(dynamic s, dynamic p, dynamic o) {
     // TODO: subject as a BlankNode
     try {
       URIRef sub = (s.runtimeType == URIRef) ? s : item(s) as URIRef;
@@ -572,8 +572,11 @@ class Graph {
   ///
   /// Updates [Graph.ctx], [Graph.groups] and [Graph.triples] in the process.
   void parseTurtle(String fileContent) {
-    final String content = _removeComments(fileContent);
+    String processedContent = _preprocessTurtleContent(fileContent);
+    final String content = _removeComments(processedContent);
+
     List parsedList = parser.parse(content).value;
+
     for (List tripleList in parsedList) {
       _saveToContext(tripleList);
     }
@@ -929,4 +932,29 @@ class Graph {
     }
     return rtnStr;
   }
+
+  /// Preprocesses Turtle content to handle multiline string literals.
+  ///
+  /// This function addresses the issue of multiline literals in Turtle syntax,
+  /// which are enclosed within triple quotes `"""`.
+  String _preprocessTurtleContent(String turtleContent) {
+    // Regular expression to match multiline literals.
+
+    final multilineLiteralRegex = RegExp(r'"""(.*?)"""', dotAll: true);
+
+    // Replace each multiline literal with a processed version.
+
+    return turtleContent.replaceAllMapped(multilineLiteralRegex, (match) {
+      // Get the multiline literal, excluding the triple quotes.
+
+      String multilineLiteral = match.group(1)!;
+
+      // Process the multiline literal as needed.
+      // Example: Replace line breaks with a special sequence.
+      String processedLiteral = multilineLiteral.replaceAll('\n', '\\n');
+
+      // Return the processed literal with the original triple quotes
+      return '"$processedLiteral"';
+    });
+  }
 }

pubspec.yaml

@@ -1,6 +1,6 @@
 name: rdflib
 description: A pure Dart package for working with RDF (resource description framework).
-version: 0.2.5
+version: 0.2.6
 homepage: https://github.com/anusii/rdflib
 repository: https://github.com/anusii/rdflib
 
@@ -9,7 +9,7 @@ environment:
 
 dependencies:
   logging: ^1.1.0
-  petitparser: ^5.1.0
+  petitparser: ^6.0.1
   http: ^1.1.0
 
 dev_dependencies: