VSG treats all pragmas as comments. Most pragmas are ignored as they do not affect the style of the code.
However, the following pragmas do affect the parser: --vhdl_comp_off and --vhdl_comp_on.
With these pragmas, it is possible to write code that would not follow the VHDL Language Reference Manual (LRM).
Take the following code as an example:
--vhdl_comp_off
entity FIFO is
--vhdl_comp_on
entity FIFO is
end entity;A parser which did not take the pragmas into account would fail because the code would appear to the parser as:
entity FIFO is
entity FIFO is
end entity;Which does not follow the VHDL LRM.
When VSG encounters the --vhdl_comp_off pragma, it will ignore anything after it until it encounters the --vhdl_comp_on pragma. No formatting will be enforced between the pragmas.