Merge pull request #2 from codetiger/main

add real-world examples for JSONLogic rules

README.md

@@ -23,22 +23,32 @@ use serde_json::json;
 
 fn main() {
     let logic = JsonLogic::new();
-
-    // Rule: Check if user is 21 or older
-    let rule = json!({
-        ">=" : [
-            {"var": "age"},
-            21
+
+    // Complex discount rule:
+    // - 20% off if cart total > $100 AND user is premium member
+    // - OR 10% off if cart has more than 5 items
+    let discount_rule = json!({
+        "or": [
+            {"and": [
+                {">": [{"var": "cart.total"}, 100]},
+                {"==": [{"var": "user.membership"}, "premium"]}
+            ]},
+            {">": [{"var": "cart.item_count"}, 5]}
         ]
     });
-
-    // Data to evaluate
-    let data = json!({
-        "age": 25
+
+    let customer_data = json!({
+        "cart": {
+            "total": 120.00,
+            "item_count": 3
+        },
+        "user": {
+            "membership": "premium"
+        }
     });
 
-    let result = logic.apply(&rule, &data).unwrap();
-    assert_eq!(result, json!(true));
+    let applies_for_discount = logic.apply(&discount_rule, &customer_data).unwrap();
+    assert_eq!(applies_for_discount, json!(true));
 }
 ```
 
@@ -49,17 +59,9 @@ This implementation supports all standard JSONLogic operations including:
 - Basic operators (`==`, `===`, `!=`, `!==`, `>`, `>=`, `<`, `<=`)
 - Logic operators (`!`, `!!`, `or`, `and`, `if`)
 - Numeric operations (`+`, `-`, `*`, `/`, `%`)
-- Array operations (
-
-map
-
-, `reduce`, `filter`, `all`, `none`, `some`, `merge`)
+- Array operations (`merge`)
 - String operations (`cat`, `substr`)
-- Data access (
-
-var
-
-)
+- Data access (`var`)
 
 For detailed documentation of operations and examples, visit [jsonlogic.com](http://jsonlogic.com).
 

examples/cart-discount.rs

@@ -0,0 +1,32 @@
+use datalogic_rs::JsonLogic;
+use serde_json::json;
+
+fn main() {
+    let logic = JsonLogic::new();
+
+    // Complex discount rule:
+    // - 20% off if cart total > $100 AND user is premium member
+    // - OR 10% off if cart has more than 5 items
+    let discount_rule = json!({
+        "or": [
+            {"and": [
+                {">": [{"var": "cart.total"}, 100]},
+                {"==": [{"var": "user.membership"}, "premium"]}
+            ]},
+            {">": [{"var": "cart.item_count"}, 5]}
+        ]
+    });
+
+    let customer_data = json!({
+        "cart": {
+            "total": 120.00,
+            "item_count": 3
+        },
+        "user": {
+            "membership": "premium"
+        }
+    });
+
+    let applies_for_discount = logic.apply(&discount_rule, &customer_data).unwrap();
+    assert_eq!(applies_for_discount, json!(true));
+}

examples/complex.rs

@@ -0,0 +1,122 @@
+use datalogic_rs::JsonLogic;
+use serde_json::json;
+
+fn main() {
+    let logic = JsonLogic::new();
+
+    // Example 1: Dynamic Pricing Rules
+    let pricing_rule = json!({
+        "if": [
+            // If holiday season (month 11-12) and premium member
+            {"and": [
+                {"in": [{"var": "date.month"}, [11, 12]]},
+                {"==": [{"var": "user.membership"}, "premium"]}
+            ]},
+            // Then apply 25% discount
+            {"*": [{"var": "cart.total"}, 0.75]},
+            // Else if cart total > 200
+            {">": [{"var": "cart.total"}, 200]},
+            // Then apply 10% discount
+            {"*": [{"var": "cart.total"}, 0.90]},
+            // Else no discount
+            {"var": "cart.total"}
+        ]
+    });
+
+    // Example 2: Loan Approval Rules
+    let loan_eligibility = json!({
+        "and": [
+            // Age between 21 and 65
+            {">=": [{"var": "applicant.age"}, 21]},
+            {"<=": [{"var": "applicant.age"}, 65]},
+            // Credit score above 700
+            {">": [{"var": "applicant.credit_score"}, 700]},
+            // Debt-to-income ratio below 40%
+            {"<": [
+                {"/": [
+                    {"var": "applicant.monthly_debt"},
+                    {"var": "applicant.monthly_income"}
+                ]},
+                0.4
+            ]},
+            // Employment history > 2 years
+            {">": [{"var": "applicant.years_employed"}, 2]}
+        ]
+    });
+
+    // Example 3: Fraud Detection Rules
+    let fraud_check = json!({
+        "or": [
+            // Multiple high-value transactions in short time
+            {"and": [
+                {">": [{"var": "transaction.amount"}, 1000]},
+                {"<": [
+                    {"-": [
+                        {"var": "transaction.timestamp"},
+                        {"var": "last_transaction.timestamp"}
+                    ]},
+                    300 // 5 minutes in seconds
+                ]}
+            ]},
+            // Transaction from unusual location
+            {"!": {"in": [
+                {"var": "transaction.country"},
+                {"var": "user.usual_countries"}
+            ]}},
+            // Unusual shopping pattern
+            {"and": [
+                {">": [{"var": "daily_transaction_count"}, 10]},
+                {">": [{"var": "transaction.amount"}, {"*": [{"var": "user.average_transaction"}, 3]}]}
+            ]}
+        ]
+    });
+
+    // Example data for testing
+    let transaction_data = json!({
+        "transaction": {
+            "amount": 1200.00,
+            "timestamp": 1677649200,
+            "country": "FR"
+        },
+        "last_transaction": {
+            "timestamp": 1677649100
+        },
+        "user": {
+            "usual_countries": ["US", "CA", "GB"],
+            "average_transaction": 200
+        },
+        "daily_transaction_count": 12
+    });
+
+    let loan_data = json!({
+        "applicant": {
+            "age": 35,
+            "credit_score": 720,
+            "monthly_debt": 2000,
+            "monthly_income": 6000,
+            "years_employed": 5
+        }
+    });
+
+    let pricing_data = json!({
+        "date": {
+            "month": 12
+        },
+        "user": {
+            "membership": "premium"
+        },
+        "cart": {
+            "total": 300.00
+        }
+    });
+
+    // Test the rules
+    let final_price = logic.apply(&pricing_rule, &pricing_data).unwrap();
+    println!("Final price after discounts: ${}", final_price);
+
+    let is_eligible = logic.apply(&loan_eligibility, &loan_data).unwrap();
+    println!("Loan application approved: {}", is_eligible);
+
+    let is_fraudulent = logic.apply(&fraud_check, &transaction_data).unwrap();
+    println!("Transaction flagged as fraudulent: {}", is_fraudulent);
+}