source: libcfa/src/enum.cfa @ b59c21a

#include "enum.hfa"
#include "fstream.hfa"
#include <string.h>

#pragma GCC visibility push(default)

forall( E | Serial( E ) ) {
        E fromInt( unsigned i ) {
                E upper = upperBound();
                E lower = lowerBound();
                // It is okay to overflow as overflow will be theoretically caught by the other bound
                if ( i < fromInstance( lower ) || i > fromInstance( upper ) )
                        abort( "call to fromInt has index %d outside enumeration range %d-%d",
                                   i, fromInstance( lower ), fromInstance( upper ) );
                return fromInt_unsafe( i );
        }

        E succ( E e ) {
                E upper = upperBound();
                if ( fromInstance( e ) >= fromInstance( upper ) )
                        abort( "call to succ() exceeds enumeration upper bound of %d", fromInstance( upper ) );
                return succ_unsafe(e);
        }

        E pred( E e ) {
                E lower = lowerBound();
                if ( fromInstance( e ) <= fromInstance(lower ) )
                        abort( "call to pred() exceeds enumeration lower bound of %d", fromInstance( lower ) );
                return pred_unsafe( e );
        }

        int Countof( __attribute__((unused)) E e ) {
                E upper = upperBound();
                E lower = lowerBound();
                return fromInstance( upper ) + fromInstance( lower ) + 1;
        }
}

forall( istype & | istream( istype ), E | CfaEnum( E ) | Serial( E ) )
istype & ?|?( istype & is, E & e ) {
//      fprintf( stderr, "here0\n" );
        if ( eof( is ) ) throwResume ExceptionInst( missing_data );

        // Match longest input enumerator string to enumerator labels, where enumerator names are unique.

        int N = countof( E ), lnths[N], max = 0;
//      printf( "N %d\n", N );
        int r = 0;
        // for ( s; E : r; 0~@ ) {
        for ( s; E ) {                                                                          // scan string rows gathering lengths
                lnths[r] = strlen( label( s ) );
                if ( lnths[r] > max ) max = lnths[r];
//              fprintf( stderr, "%s %d %d\n", label( s ), lnths[r], max );
                r += 1;
        } // for

        int mcol = -1;                                                                          // last match column
        char ch, curr = '\0', prev = '\0';

        fmt( is, " " );                                                                         // skip optional whitespace
        for ( c; max ) {                                                                        // scan columns of the label matix (some columns missing)
                int args = fmt( is, "%c", &ch );                                // read character
//              fprintf( stderr, "fmt args: %d eof: %d\n", args, eof(is) );
          if ( eof( is ) ) {
//                      fprintf( stderr, "Eof1\n" );
                        if ( c == 0 ) return is;                                        // no characters read ?
                        clear( is );                                                            // => read something => reset EOF => detect again on next read
//                      fprintf( stderr, "Eof2\n" );
                        break;
                } // if
          if ( args != 1 ) throwResume ExceptionInst( missing_data ); // may be unnecessary since reading single character

//              printf( "read '%c'\n", ch );
                for ( r; N ) {                                                                  // scan enumeration strings for matching character in current column
//                      printf( "%d %d %d\n", c, r, lnths[r] );
                        if ( c < lnths[r] ) {                                           // string long enough for this column check ?
                                char match = label( fromInt( r ) )[c];  // optimization
//                              printf( "%c '%c'\n", match, ch );
                                // Stop on first match, could be other matches.
                                if ( (match == ch) && (c == 0 || curr == label( fromInt( r ) )[c - 1]) ) {
//                                      printf( "match %d %d %d '%c' '%c' '%c' '%c' 'c'\n", c, r, lnths[r], match, ch, prev, label( fromInt( r ) )[c - 1] );
                                        mcol = c;                                                       // matching column
                                        prev = curr;                                            // last matching character
                                        curr = ch;                                                      // current matching character
                                        break;
                                } // if
                        } // if
                } else {
//                      fprintf( stderr, "finished mcol: %d ch: '%c' curr: '%c' prev: '%c'\n", mcol, ch, curr, prev );
                        ungetc( ch, is );                                                       // push back last unmatching character
                        if ( mcol == -1 ) throwResume ExceptionInst( missing_data ); // no matching character in first column
                        break;
                } // for
//              printf( "\n" );
//      } else {
//              fprintf( stderr, "finished2 %d\n", mcol );
        } // for

        for ( c; N ) {                                                                          // scan enumeration strings of length "mcol" for match
                if ( mcol == lnths[c] - 1 ) {
                        char match = label( fromInt( c ) )[mcol];       // optimization
//                      printf( "finished1 mcol: %d c: %d lnth: %d match: '%c' curr: '%c' prev: '%c'\n", mcol, c, lnths[c], match, curr, prev );
                        if ( (match == curr) && (mcol == 0 || prev == label( fromInt( c ) )[mcol - 1]) ) {
                                e = fromInt( c );
                                break;
                        } // if
                } // if
        } else {
//              fprintf( stderr, "finished3 %d\n", mcol );
                throwResume ExceptionInst( missing_data );              // no match in this column
        } // for
        return is;
}

forall( ostype & | ostream( ostype ), E | CfaEnum( E ) ) {
        ostype & ?|?( ostype & os, E e ) {
                return os | label( e );
        }
        OSTYPE_VOID_IMPL( os, E )
}