VTL editor is not correctly handling simple quotes use

[romaintailhurat]

In VTL, strings start and end with a double quote (→ "). Thus, using simple quotes (→ ') should raise a syntax error or at least a warning.

The misuse of simple quotes leads to subtle bugs, consider this case:

• we want to check the content of a text response fied,
• for that i use the editor and write the following control : $MY_VAR$ = 'bad text'
• when generating the web questionnaire[0], it will trigger the control for any text,
• correcting the control code to $MY_VAR$ = "bad text",
• the behaviour is now the good one, only triggering the error message when typing bad text

The existing VTL in Pogues documentation (for now in french only 🇫🇷 ) highlight the exclusive use of double quotes, but it would be nice that the editor helps here.

[0] remember, the generating target is a web form using both Lunatic and Trevas-JS