How to know what's the position of current argument in function calls?

[durianwaffle]

Question1: If I have a function MAX(a,b), argument a and argument b are recognized to be argument. And MAX() is recognized as functionCall. How do I know what's the position of each argument in functionCall?

One way is to count the number of , after left parenthesis to know the position of current parameter. But is there any other method to know the position of argument in function call?

Question 2: I found that if I type MAX(,), there will be grammar errors as shown below. How to delete this error msg? Can I delete it by creating a custom ParserErrorMessageProvider?

https://statics.teams.cdn.office.net/evergreen-assets/safelinks/1/atp-safelinks.html

[msujew]

Hey @durianwaffle,

If I have a function MAX(a,b), argument a and argument b are recognized to be argument. And MAX() is recognized as functionCall. How do I know what's the position of each argument in functionCall?

You can use the $containerIndex property of the argument AST node.

I found that if I type MAX(,), there will be grammar errors as shown below. How to delete this error msg? Can I delete it by creating a custom ParserErrorMessageProvider?

I would recommend you to adjust the grammar to support adding empty arguments. Everything else is just a hack.