c - Lexical Tie-Ins with Flex and Bison -

I want to identify the language that does not conform to the normal flex / bisan paradigm. Based on the meaning context it has completely different token rules, for example:

  main () {batchblocks {echo hello world! Set backing = some echo% batchvar%}}  

Biosan apparently supports the recognition of these types of grammar, but it is necessary "" to effectively support them. It provides an interface to do this - but I'm confused as to how I can supply different flex regazes based on context - if this is also possible.

Thank you in advance :)

I am confused as to the context Based on how many exact flex regexes can I supply

Flex has a state mechanism under which you can switch it between different sets. For this, after the << p>

 % x name_of_state  

<< code>%} at the top of the syntax file is more in your matching Rule (after the first %% )

  & lt; Name_of_state & gt; * Regex goes here *  

Then it regex matches only if that condition is there.

There is more than one way to change the states. This is also a global state and <; For example, if you want to keep a heap of states, then yy_pop_state and yy_push_state can alternatively use BEGIN_ (name_of_state) To return to the initial state, use BEGIN (INITIAL) .