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/*
* @LANG: c++
*/
/* Balanced parenthesis with conditions. */
#include <iostream>
#include <string.h>
using std::cout;
using std::endl;
%%{
machine cond;
write data noerror;
}%%
void test( const char *str )
{
int cs = cond_start, n = 0;
const char *p = str;
const char *pe = str + strlen( str );
%%{
comment = '(' @{n=0;}
( '('@{n++;} | ')'@{n--;} | [^()] )*
:> ')' when{!n};
main := ' '* comment ' '* '\n' @{cout << "success";};
write exec;
}%%
if ( cs < cond_first_final )
cout << "failure";
cout << endl;
}
int main()
{
test( "( ( )\n" );
test( "()()\n" );
test( "(((\n" );
test( "((()\n" );
test( "((())\n" );
test( "()\n" );
test( "((()))\n" );
test( "(()())\n" );
test( "((())()(((()))))\n" );
return 0;
}
#ifdef _____OUTPUT_____
failure
failure
failure
failure
failure
success
success
success
success
#endif
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