void OCamlFTabCodeGen::writeExec()

in ragel/src/ragel/mlftable.cpp [300:461]

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

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

	out << 
		"	begin\n";

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

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

//	if ( redFsm->anyConditions() )
//		out << "	" << WIDE_ALPH_TYPE() << " _widec;\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 <<
			"	begin match " << AT( FSA(), vCS() ) << " with\n";
			FROM_STATE_ACTION_SWITCH();
			SWITCH_DEFAULT() <<
			"	end;\n"
			"\n";
	}

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

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

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

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

	if ( useIndicies )
		out << "	state.trans <- " << CAST(transType) << AT( I(), "state.trans" ) << ";\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 << 
			"	begin try if " << AT( TA() , "state.trans" ) << " = 0 then\n"
			"		raise Goto_again;\n"
			"\n"
			"	match " << AT( TA(), "state.trans" ) << " with\n";
			ACTION_SWITCH();
			SWITCH_DEFAULT() <<
			"	with Goto_again -> () end;\n"
			"\n";
	}
  out << "\tdo_again ()\n";

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

	if ( redFsm->anyToStateActions() ) {
		out <<
			"	begin match " << AT( TSA(), vCS() ) << " with\n";
			TO_STATE_ACTION_SWITCH();
			SWITCH_DEFAULT() <<
			"	end;\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 <<
				"	begin match " << AT( EA(), vCS() ) << " with\n";
				EOF_ACTION_SWITCH();
				SWITCH_DEFAULT() <<
				"	end\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";
}