[ragel-users] Alternative syntax for Ragel spec blocks

[Adrian Thurston]

Hi Denis, I can see how it would be nice to have a mode that can be used
with an IDE without having to add a customization. It should be easier
to do with the ragel 7 frontend. I've added it as a feature request to
my issue tracking system. 

On 2019-04-13 13:09, Denis Naumov wrote: 

> Alternative syntax for Ragel spec blocks.
> 
> Ragel uses code block syntax typical for other lexical generators ( %%{...}%% ).
> But as a rule, we edit *.rl the file in some IDE and type of editor for *.rl file and for main code file is the same.
> I.e. if we use C++, then *.rl is often also edited as C++ the file.
> Using %%{...}%% blocks break IDE code analisis as C++(or other) code.
> 
> It would be good if Ragel could maintain "comment syntax" of code blocks in style like Re2C:
> /*!ragel
> <multi-line FSM spec>
> */
> //!ragel <single-line FSM spec>
> 
> "comment syntax" can be implement all languages with C-style comments.
> 
> With "comment syntax" *.rl file would IDE frendly:
> - *.rl the file is 100% correct c/c++/java file.
> - syntax highlighting of the source code - works correctly.
> - IntelliSence, auto-formatting and so on - works correctly.
> 
> Ragel can process %%{...}%% and /*! ragel... */ syntax at the same time or to use a special option (for example, --syntax=general/comment)
> 
> Example:
> --- general ragel ragel file ------------------
> #include <string.h>
> #include <stdio.h>
> 
> %%{
> machine foo;
> main := ( 'foo' | 'bar' ) 0 @{ res = 1; };
> }%%
> 
> %% write data;
> 
> int main( int argc, char **argv )
> {
> int cs, res = 0;
> 
> if ( argc > 1 ) {
> char *p = argv[1];
> char *pe = p + strlen(p) + 1;
> %% write init;
> %% write exec;
> }
> 
> printf("result = %in", res );
> return 0;
> }
> -----------------------------------------------
> 
> --- IDE frendly ragel file --------------------
> #include <string.h>
> #include <stdio.h>
> 
> /*!ragel
> machine foo;
> main := ( 'foo' | 'bar' ) 0 @{ res = 1; };
> */
> 
> //!ragel write data;
> 
> int main( int argc, char **argv )
> {
> int cs, res = 0;
> if ( argc > 1 ) {
> char *p = argv[1];
> char *pe = p + strlen(p) + 1;
> //!ragel write init;
> //!ragel write exec;
> }
> printf("result = %in", res );
> return 0;
> }
> -----------------------------------------------
> 
> What do you think?
> 
> Thanks for good tool.
> 
> Best regards,
> Denis. 
> 
> _______________________________________________
> ragel-users mailing list
> ragel-users at colm.net
> http://www.colm.net/cgi-bin/mailman/listinfo/ragel-users [1]
 

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