private ISyntaxTree ParseExpression()
{
var token = tokens.ConsumeNextType(TokenType.Identifier, TokenType.IntConstant);
var tree = new SyntaxTree(token);
if (token.Type == TokenType.IntConstant)
{
return(tree);
}
if (!tokens.IsNextType(TokenType.OpenParen))
{
return(tree);
}
// has children
foreach (var child in ParseChildren())
{
tree.AddChild(child);
}
return(tree);
}