Implement case-insensitive scripting language

[maelmahdy86]

Hi,

I've a situation where I need to implement a small scripting language in my system but it must be case-insensitive

Is it supported by csly?

[b3b00]

could you explain a bit more what a case insensitive language is for you ? have you any example of typical source code ?

[maelmahdy86]

@b3b00 for example, to declare a new variable, user can type: declare x or DECLARE x or DeclArE x
DECLARE keyword should be parsed at all cases

[b3b00]

This is basically a lexing probelm as You have to label every possible casing od "declare" as a declare token. For a short keword you could enumerate all possible casing. For instance a "let" keword can have 2^3 = 8 casing. but declare is 7 letters long and 2^7 is 128 possibilities !
If I have to give it a go I will use the generic lexer with lexer callbacks.

Let me some time to show you with a simple sample.it 's weekend time for now

[b3b00]

I quickly coded a sample as a unit test. You can find it https://github.com/b3b00/csly/tree/fix/267/ParserTests/Issue267.

I have problems compiling csly right now (dont now why) so I have not tested it. But the general idea is there :

[maelmahdy86]

Thanks for your quick response

unfortunately, the callback solution didn't work but I managed to make it work following your suggestion to go with generic lexer

I highly recommend that you support this feature with other types of lexers as well as it's very common requirement when it comes to embedded scripting languages :)

[b3b00]

@maelmahdy86 Indeed my solution can not work without losing syntax checking. Could you share how you 've solved this ?
For tracking and maybe feature enhancement ....

[maelmahdy86]

Actually, All I did is using generic lexer with [Lexer(KeyWordIgnoreCase = true)] attribute and it worked like charm :)

[b3b00]

Thanks for your answer, I did not even remember of this feature 😊