refactor; add order() fn; add examples

examples/nested_filters.rs

@@ -0,0 +1,53 @@
+use jsonfilter::{try_matches, FilterError};
+use serde_json::{json, Value};
+
+fn main() {
+    // Filter can be as complex as you want
+    let filter = json!({
+        "$and": [
+            {"$or": [
+                {"age": {"$gte": 18}},
+                {"is_student": true}
+            ]},
+            {"$not": {
+                "$or": [
+                    {"city": "New York"},
+                    {"city": "Los Angeles"}
+                ]
+            }}
+        ]
+    });
+
+    let obj1 = json!({"age": 25, "is_student": false, "city": "Chicago"});
+    let obj2 = json!({"age": 16, "is_student": true, "city": "Miami"});
+    let obj3 = json!({"age": 30, "is_student": false, "city": "New York"});
+
+    println!("Filter:");
+    println!("{}", filter);
+    println!("Objects:");
+    println!("Object 1: {}", obj1);
+    println!("Object 2: {}", obj2);
+    println!("Object 3: {}", obj3);
+
+    // Matching objects against the filter
+    match_objects(&filter, &obj1);
+    match_objects(&filter, &obj2);
+    match_objects(&filter, &obj3);
+}
+
+fn match_objects(filter: &Value, obj: &Value) {
+    match try_matches(filter, obj) {
+        Ok(result) => {
+            if result {
+                println!("Filter matches the object");
+            } else {
+                println!("Filter does not match the object");
+            }
+        }
+        Err(err) => match err {
+            FilterError::InvalidFilter => println!("Invalid filter"),
+            FilterError::UnknownOperator => println!("Unknown operator in filter"),
+            FilterError::KeyNotFound => println!("Key not found in object"),
+        },
+    }
+}