Selectively changing/inhibiting character composition?

[Marcus Harnisch]

Hi All

While I am quite happy with character composition using ligature.el, 
there is one particular feature that would like to see.

Some programming languages reuse certain character sequences in 
different contexts. E.g. in Verilog the character sequence “<=” could be 
an assignment operator or a less-or-equal operator, depending on the 
context.

The latter should be composited using the ligature for “less than or 
equal to”, while in the former case I'd rather get a fancy arrow 
ligature (ideally) or no ligature at all.

Is there any way to achieve this?

Cheers,
Marcus