public FunctionNode(IdentifierNode name, List <ParameterNode> parameters, List <StatementNode> body, ReturnNode returnNode) : base(SyntaxType.FUNCTION)
{
this.functionName = name;
this.parameters = parameters;
this.body = body;
this.returnNode = returnNode;
}
public FunctionNode(IdentifierNode name, List <ParameterNode> parameters) : base(SyntaxType.FUNCTION)
{
this.functionName = name;
this.parameters = parameters;
this.body = null;
this.returnNode = null;
}
private ReturnInstruction GenerateReturn(ReturnNode node)
{
SyntaxNode current = node.returnValue;
string returnExpression = "";
GenerateReturn(current, ref returnExpression);
return(new ReturnInstruction(returnExpression));
}
private FunctionNode ReadFunction()
{
IdentifierNode functionName = ReadIdentifier();
List <ParameterNode> parameters = ReadParameters();
if (tokenStream.ReadToken().type != TokenType.LEFT_BRACE)
{
throw new Exception("Expected Left Brace");
}
List <StatementNode> body = ReadStatements();
ReturnNode returnNode = ReadReturn();
if (tokenStream.ReadToken().type != TokenType.RIGHT_BRACE)
{
throw new Exception("Expected Right Brace");
}
return(new FunctionNode(functionName, parameters, body, returnNode));
}
private SyntaxNode Bind(FunctionNode node, Dictionary <string, string> env)
{
Dictionary <string, string> localEnvironment = new Dictionary <string, string>();
string name = "f" + GetFunctionCount();
env.Add(node.functionName.identifier, name);
List <ParameterNode> boundParams = BindParameters(node.parameters, localEnvironment);
List <StatementNode> boundStatements = new List <StatementNode>();
foreach (StatementNode statement in node.body)
{
StatementNode boundStatement = Bind(statement, localEnvironment);
boundStatements.Add(boundStatement);
}
ReturnNode boundReturn = null;
if (node.returnNode != null)
{
boundReturn = BindReturn(node.returnNode, localEnvironment);
}
return(new FunctionNode(new IdentifierNode(name), boundParams, boundStatements, boundReturn));
}
private ReturnNode BindReturn(ReturnNode node, Dictionary <string, string> environment)
{
SyntaxNode boundReturn = BindExpression(node.returnValue, environment);
return(new ReturnNode(boundReturn));
}