void OCamlFlatCodeGen::writeExec()

in ragel/src/ragel/mlflat.cpp [702:903]

• 142 lines of code
• 16 McCabe index (conditional complexity)

void OCamlFlatCodeGen::writeExec()
{
	testEofUsed = false;
	outLabelUsed = false;
	initVarTypes();

	out << 
		"	begin\n";
//		"	" << slenType << " _slen";

//	if ( redFsm->anyRegCurStateRef() )
//		out << ", _ps";

//	out << 
//		"	" << transType << " _trans";

//	if ( redFsm->anyConditions() )
//		out << ", _cond";
//	out << ";\n";

//	if ( redFsm->anyToStateActions() || 
//			redFsm->anyRegActions() || redFsm->anyFromStateActions() )
//	{
//		out << 
//			"	int _acts;\n"
//			"	int _nacts;\n"; 
//	}

//	out <<
//		"	" << "int _keys;\n"
//		"	" << indsType << " _inds;\n";
		/*
		"	" << PTR_CONST() << WIDE_ALPH_TYPE() << POINTER() << "_keys;\n"
		"	" << PTR_CONST() << ARRAY_TYPE(redFsm->maxIndex) << POINTER() << "_inds;\n";*/

	if ( redFsm->anyConditions() ) {
		out << 
			"	" << condsType << " _conds;\n"
			"	" << WIDE_ALPH_TYPE() << " _widec;\n";
	}

	out << "\n";

  out <<
    "	let state = { trans = 0; acts = 0; nacts = 0; } in\n"
    "	let rec do_start () =\n";

	if ( !noEnd ) {
		testEofUsed = true;
		out << 
			"	if " << P() << " = " << PE() << " then\n"
			"		do_test_eof ()\n"
      "\telse\n";
	}

	if ( redFsm->errState != 0 ) {
		outLabelUsed = true;
		out << 
			"	if " << vCS() << " = " << redFsm->errState->id << " then\n"
			"		do_out ()\n"
      "\telse\n";
	}

  out << "\tdo_resume ()\n";

	out << "and do_resume () =\n";

	if ( redFsm->anyFromStateActions() ) {
		out <<
			"	state.acts <- " << AT( FSA(), vCS() ) << ";\n"
			"	state.nacts <- " << AT( A(), POST_INCR("state.acts") ) << ";\n"
			"	while " << POST_DECR("state.nacts") << " > 0 do\n"
			"		begin match " << AT( A(), POST_INCR("state.acts") ) << " with\n";
			FROM_STATE_ACTION_SWITCH();
			SWITCH_DEFAULT() <<
			"		end\n"
			"	done;\n"
			"\n";
	}

	if ( redFsm->anyConditions() )
		COND_TRANSLATE();

//  out << "\tbegin try\n";
	LOCATE_TRANS();
//  out << "\twith Goto_match -> () end;\n";

  out << "\tdo_eof_trans ()\n";

//	if ( redFsm->anyEofTrans() )
  out << "and do_eof_trans () =\n";

	if ( redFsm->anyRegCurStateRef() )
		out << "	let ps = " << vCS() << " in\n";

	out <<
		"	" << vCS() << " <- " << AT( TT() ,"state.trans" ) << ";\n"
		"\n";

	if ( redFsm->anyRegActions() ) {
		out <<
			"\tbegin try\n"
      "	match " << AT( TA(), "state.trans" ) << " with\n"
			"\t| 0 -> raise Goto_again\n"
      "\t| _ ->\n"
			"	state.acts <- " << AT( TA(), "state.trans" ) << ";\n"
			"	state.nacts <- " << AT( A(), POST_INCR("state.acts") ) << ";\n"
			"	while " << POST_DECR("state.nacts") << " > 0 do\n"
			"		begin match " << AT( A(), POST_INCR("state.acts") ) << " with\n";
			ACTION_SWITCH();
			SWITCH_DEFAULT() <<
			"		end;\n"
			"	done\n"
      "\twith Goto_again -> () end;\n";
	}
  out << "\tdo_again ()\n";

//	if ( redFsm->anyRegActions() || redFsm->anyActionGotos() || 
//			redFsm->anyActionCalls() || redFsm->anyActionRets() )
  out << "\tand do_again () =\n";

	if ( redFsm->anyToStateActions() ) {
		out <<
			"	state.acts <- " << AT( TSA(), vCS() ) << ";\n"
			"	state.nacts <- " << AT( A(), POST_INCR("state.acts") ) << ";\n"
			"	while " << POST_DECR("state.nacts") << " > 0 do\n"
			"		begin match " << AT( A(), POST_INCR("state.acts") ) << " with\n";
			TO_STATE_ACTION_SWITCH();
			SWITCH_DEFAULT() <<
			"		end\n"
			"	done;\n"
			"\n";
	}

	if ( redFsm->errState != 0 ) {
		outLabelUsed = true;
		out << 
			"	match " << vCS() << " with\n"
      "\t| " << redFsm->errState->id << " -> do_out ()\n"
      "\t| _ ->\n";
	}

  out << "\t" << P() << " <- " << P() << " + 1;\n";

	if ( !noEnd ) {
		out << 
			"	if " << P() << " <> " << PE() << " then\n"
			"		do_resume ()\n"
      "\telse do_test_eof ()\n";
	}
	else {
		out << 
			"	do_resume ()\n";
	}

//	if ( testEofUsed )
	out << "and do_test_eof () =\n";

	if ( redFsm->anyEofTrans() || redFsm->anyEofActions() ) {
		out << 
			"	if " << P() << " = " << vEOF() << " then\n"
			"	begin try\n";

		if ( redFsm->anyEofTrans() ) {
			out <<
				"	if " << AT( ET(), vCS() ) << " > 0 then\n"
				"	begin\n"
        "   state.trans <- " << CAST(transType) << "(" << AT( ET(), vCS() ) << " - 1);\n"
				"		raise Goto_eof_trans;\n"
				"	end;\n";
		}

		if ( redFsm->anyEofActions() ) {
			out <<
				"	let __acts = ref " << AT( EA(), vCS() ) << " in\n"
				"	let __nacts = ref " << AT( A(), "!__acts" ) << " in\n"
        " incr __acts;\n"
				"	while !__nacts > 0 do\n"
        "   decr __nacts;\n"
				"		begin match " << AT( A(), POST_INCR("__acts.contents") ) << " with\n";
				EOF_ACTION_SWITCH();
				SWITCH_DEFAULT() <<
				"		end;\n"
				"	done\n";
		}

		out << 
			"	with Goto_again -> do_again ()\n"
			"	| Goto_eof_trans -> do_eof_trans () end\n"
			"\n";
	}
  else
  {
    out << "\t()\n";
  }

	if ( outLabelUsed )
		out << "	and do_out () = ()\n";

  out << "\tin do_start ()\n";
	out << "	end;\n";
}