AEPRulesEngine

Overview

A simple, generic, extensible Rules Engine in Swift.

Requirements

• Xcode 14.1 (or newer)
• Swift 5.1 (or newer)

Installation

CocoaPods

# Podfile
use_frameworks!

target 'YOUR_TARGET_NAME' do
    pod 'AEPRulesEngine'
end

Replace YOUR_TARGET_NAME and then, in the Podfile directory, type:

$ pod install

Swift Package Manager

To add the AEPRulesEngine package to your application, from the Xcode menu select:

File > Swift Packages > Add Package Dependency...

Enter the URL for the AEPRulesEngine package repository: https://github.com/adobe/aepsdk-rulesengine-ios.git.

When prompted, input a specific version or a range of versions.

Alternatively, if your project has a Package.swift file, you can add AEPRulesEngine directly to your dependencies:

dependencies: [
    .package(url: "https://github.com/adobe/aepsdk-rulesengine-ios.git", .upToNextMajor(from: "4.0.0"))
]

Usage

Initialize the Rules Engine

To create a RulesEngine instance, define an Evaluator and pass it to the RulesEngine's initializer:

let evaluator = ConditionEvaluator(options: .caseInsensitive)
let rulesEngine = RulesEngine(evaluator: evaluator)

Define Rules

Anything that conforms to the Rule protocol can be used as rule:

public class MobileRule: Rule {
    init(condition: Evaluable) { self.condition = condition }
    var condition: Evaluable
}
let condition = ComparisonExpression(lhs: "abc", operationName: "equals", rhs: "abc")
let rule = MobileRule(condition: condition)
rulesEngine.addRules(rules: [rule])

A rule without the flexibility to dynamically fetch a value will always evaluate to true or false. To fetch the value for a rule at runtime, use a Mustache Token:

let mustache = Operand<String>(mustache: "{{company}}")
let condition = ComparisonExpression(lhs: mustache, operationName: "equals", rhs: "adobe")
let rule = MobileRule(condition: condition)
rulesEngine.addRules(rules: [rule])

Evaluate data

Use the evaluate method to process Traversable data through the RulesEngine:

let matchedRules = rulesEngine.evaluate(data: ["company":"adobe"])

Contributing

Contributions are welcomed! Read the Contributing Guide for more information.

Licensing

This project is licensed under the Apache V2 License. See LICENSE for more information.