XCTreeLang-XCFramework/XCTreeLang/Runtime/XCTLRuntimeAbstractContext.swift

//
//  XCTLRuntimeAbstractContext.swift
//  notebook
//
//  Created by 邢铖 on 2023/5/25.
//

import Foundation

internal class XCTLRuntimeVariableStackFrame {
    
    private var stack = [XCTLRuntimeVariable]()
    
    internal func pushVariable(_ variable: XCTLRuntimeVariable) {
        self.stack.append(variable)
    }
    
    internal func popVariable() -> XCTLRuntimeVariable? {
        self.stack.popLast()
    }
    
    internal var isEmpty: Bool {
        return self.stack.isEmpty
    }
    
}

internal protocol XCTLRuntimeAbstractContext: AnyObject {
    
    var nativeObjectInstance: NSObject { get }
    
    func valueDefined(_ name: String) -> Bool
    func value(forName name: String) -> XCTLRuntimeVariable?
    func setValue(_ value: XCTLRuntimeVariable, forName name: String)
    func setValueToRoot(_ value: XCTLRuntimeVariable, forName name: String, assumeExport export: Bool)
    func setValueToRootAssumeExport(_ value: XCTLRuntimeVariable, forName name: String)
    func setValueIgnoreParent(_ value: XCTLRuntimeVariable, forName name: String)
    
    func addImport(name: String)
    func addExport(name: String)
    func hasExport(name: String) -> Bool
    
    func allocateObject(name: String, args: [XCTLRuntimeVariable]) throws -> XCTLRuntimeVariable
    func addLazyStatement(_ stmt: XCTLReferencedVariableStatement)
    
    func makeSubContext() -> XCTLRuntimeAbstractContext
    
    func findConditionFrame() -> XCTLConditionParentStatementFrame?
    func findListFrame() -> XCTLListStatementFrame?
    func findForFrame() -> XCTLForStatementFrame?
    func recordConditionFrame(_ frame: XCTLConditionParentStatementFrame?)
    func recordListFrame(_ frame: XCTLListStatementFrame?)
    func recordForFrame(_ frame: XCTLForStatementFrame?)
    
    func getParentContext() -> XCTLRuntimeAbstractContext?
    
    var variableStack: XCTLRuntimeVariableStackFrame { get set }
    
}