Built graph for JSON2GRAPH, need to convert the graph content to RDF formatted file

Author: bharath181

.gitignore

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+/target

Cargo.lock

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+[package]
+name = "json2rdf"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+petgraph = "0.6.5"
+rio_api = "0.8.4"
+rio_turtle = "0.8.4"
+serde = "1.0.203"
+serde_json = "1.0.117"

Cargo.toml

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+{
+    "aircraft": {
+        "id": "A12345",
+        "model": "Boeing 747",
+        "manufacturer": "Boeing",
+        "capacity": {
+            "seats": 416,
+            "cargo_volume": 150.4
+        }
+    }
+}

src/airplane.json

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+use petgraph::graph::{Graph, NodeIndex};
+use petgraph::visit::EdgeRef;
+use rio_api::formatter::TriplesFormatter;
+use rio_api::model::{NamedNode, Triple};
+use rio_turtle::NTriplesFormatter;
+use serde_json::Value;
+use std::fs::File;
+use std::io::BufReader;
+
+fn json_to_graph(value: &Value, graph: &mut Graph<String, String>, parent: Option<NodeIndex>) {
+    match value {
+        Value::Object(map) => {
+            for (key, val) in map {
+                let node = graph.add_node(key.clone());
+                if let Some(parent_index) = parent {
+                    graph.add_edge(parent_index, node, "".to_string());
+                }
+                json_to_graph(val, graph, Some(node));
+            }
+        }
+        Value::Array(arr) => {
+            for val in arr {
+                json_to_graph(val, graph, parent);
+            }
+        }
+        _ => {
+            let node = graph.add_node(value.to_string());
+            if let Some(parent_index) = parent {
+                graph.add_edge(parent_index, node, "".to_string());
+            }
+        }
+    }
+}
+
+fn graph_to_ttl(graph: &mut Graph<String, String>, file_path: &str) {
+    let mut file = File::create(file_path);
+
+    let mut formatter = NTriplesFormatter::new(Vec::default());
+
+    for edge in graph.edge_references() {}
+}
+
+fn main() -> serde_json::Result<()> {
+    let file_path = "/home/bharath/documents/github/json2rdf/src/airplane.json";
+    let file = File::open(file_path).unwrap();
+    let reader = BufReader::new(file);
+    let json_value: Value = serde_json::from_reader(reader).unwrap();
+
+    let mut graph = Graph::<String, String>::new();
+
+    json_to_graph(&json_value, &mut graph, None);
+
+    Ok(())
+}