public MethodDeclaringNode(IdentifierNode ident, TypeNode type, ParameterSequenceNode parameters,
DeclaringSequenceNode vars, ActionSequenceNode actions, ReturnActionNode ret, SourceCodePosition pos)
: base(pos)
{
Identifier = ident;
Type = type;
Parameters = parameters;
VarDeclarings = vars;
Actions = actions;
Return = ret;
}
public object Visit(ReturnActionNode n, object o)
{
if (n.Expression is null)
{
AppendLine($"{AddIndent()}return;");
}
else
{
Append($"{AddIndent()}return ");
n.Expression.Accept(this, null);
AppendLine(";");
}
return(null);
}
private ReturnActionNode ReturnStatement()
{
ReturnActionNode itsAST;
SourceCodePosition itsPos = _currentToken.SourcePosition;
Accept(Token.TokenType.Return);
if (_currentToken.Type == Token.TokenType.Semicolon)
{
itsAST = new ReturnActionNode(null, itsPos); // null indicates void return type
}
else
{
itsAST = new ReturnActionNode(Expression(), itsPos);
}
Accept(Token.TokenType.Semicolon);
return(itsAST);
}
private MethodDeclaringNode ParseMethodDeclaring()
{
MethodDeclaringNode itsAST;
SourceCodePosition itsPos = _currentToken.SourcePosition;
Accept(Token.TokenType.Method);
TypeNode itsType = ReturnType();
IdentifierNode itsName = new IdentifierNode(_currentToken);
Accept(Token.TokenType.Identifier);
Accept(Token.TokenType.LeftParen);
ParameterSequenceNode itsParams = Parameters();
Accept(Token.TokenType.RightParen);
Accept(Token.TokenType.LeftBrace);
DeclaringSequenceNode itsVars = VariableDeclarings();
ActionSequenceNode itsActions = ActionStatements();
ReturnActionNode itsReturn = ReturnStatement();
Accept(Token.TokenType.RightBrace);
itsAST = new MethodDeclaringNode(itsName, itsType, itsParams, itsVars, itsActions, itsReturn, itsPos);
return(itsAST);
}
public object Visit(ReturnActionNode n, object o)
{
return(null);
}
// actionNode consturctor
public ActionNode(ReturnActionNode _action)
{
action = _action;
}
