graphviz_graph_lex.cpp

boost库提供标准的C++ API 配合dev c++使用,功能更加强大

                        { /* This was really a NUL. */
                        yy_state_type yy_next_state;

                        yy_c_buf_p = bgl_undir_text_ptr + yy_amount_of_matched_text;

                        yy_current_state = yy_get_previous_state();

                        /* Okay, we're now positioned to make the NUL
                         * transition.  We couldn't have
                         * yy_get_previous_state() go ahead and do it
                         * for us because it doesn't know how to deal
                         * with the possibility of jamming (and we don't
                         * want to build jamming into it because then it
                         * will run more slowly).
                         */

                        yy_next_state = yy_try_NUL_trans( yy_current_state );

                        yy_bp = bgl_undir_text_ptr + YY_MORE_ADJ;

                        if ( yy_next_state )
                                {
                                /* Consume the NUL. */
                                yy_cp = ++yy_c_buf_p;
                                yy_current_state = yy_next_state;
                                goto yy_match;
                                }

                        else
                                {
                                yy_cp = yy_c_buf_p;
                                goto yy_find_action;
                                }
                        }

                else switch ( yy_get_next_buffer() )
                        {
                        case EOB_ACT_END_OF_FILE:
                                {
                                yy_did_buffer_switch_on_eof = 0;

                                if ( yywrap() )
                                        {
                                        /* Note: because we've taken care in
                                         * yy_get_next_buffer() to have set up
                                         * bgl_undir_text, we can now set up
                                         * yy_c_buf_p so that if some total
                                         * hoser (like flex itself) wants to
                                         * call the scanner after we return the
                                         * YY_NULL, it'll still work - another
                                         * YY_NULL will get returned.
                                         */
                                        yy_c_buf_p = bgl_undir_text_ptr + YY_MORE_ADJ;

                                        yy_act = YY_STATE_EOF(YY_START);
                                        goto do_action;
                                        }

                                else
                                        {
                                        if ( ! yy_did_buffer_switch_on_eof )
                                                YY_NEW_FILE;
                                        }
                                break;
                                }

                        case EOB_ACT_CONTINUE_SCAN:
                                yy_c_buf_p =
                                        bgl_undir_text_ptr + yy_amount_of_matched_text;

                                yy_current_state = yy_get_previous_state();

                                yy_cp = yy_c_buf_p;
                                yy_bp = bgl_undir_text_ptr + YY_MORE_ADJ;
                                goto yy_match;

                        case EOB_ACT_LAST_MATCH:
                                yy_c_buf_p =
                                &yy_current_buffer->yy_ch_buf[yy_n_chars];

                                yy_current_state = yy_get_previous_state();

                                yy_cp = yy_c_buf_p;
                                yy_bp = bgl_undir_text_ptr + YY_MORE_ADJ;
                                goto yy_find_action;
                        }
                break;
                }

        default:
                YY_FATAL_ERROR(
                        "fatal flex scanner internal error--no action found" );
        } /* end of action switch */
                } /* end of scanning one token */
        } /* end of bgl_undir_lex */


/* yy_get_next_buffer - try to read in a new buffer
 *
 * Returns a code representing an action:
 *      EOB_ACT_LAST_MATCH -
 *      EOB_ACT_CONTINUE_SCAN - continue scanning from current position
 *      EOB_ACT_END_OF_FILE - end of file
 */

static int yy_get_next_buffer()
        {
        register char *dest = yy_current_buffer->yy_ch_buf;
        register char *source = bgl_undir_text_ptr;
        register int number_to_move, i;
        int ret_val;

        if ( yy_c_buf_p > &yy_current_buffer->yy_ch_buf[yy_n_chars + 1] )
                YY_FATAL_ERROR(
                "fatal flex scanner internal error--end of buffer missed" );

        if ( yy_current_buffer->yy_fill_buffer == 0 )
                { /* Don't try to fill the buffer, so this is an EOF. */
                if ( yy_c_buf_p - bgl_undir_text_ptr - YY_MORE_ADJ == 1 )
                        {
                        /* We matched a single character, the EOB, so
                         * treat this as a final EOF.
                         */
                        return EOB_ACT_END_OF_FILE;
                        }

                else
                        {
                        /* We matched some text prior to the EOB, first
                         * process it.
                         */
                        return EOB_ACT_LAST_MATCH;
                        }
                }

        /* Try to read more data. */

        /* First move last chars to start of buffer. */
        number_to_move = (int) (yy_c_buf_p - bgl_undir_text_ptr) - 1;

        for ( i = 0; i < number_to_move; ++i )
                *(dest++) = *(source++);

        if ( yy_current_buffer->yy_buffer_status == YY_BUFFER_EOF_PENDING )
                /* don't do the read, it's not guaranteed to return an EOF,
                 * just force an EOF
                 */
                yy_current_buffer->yy_n_chars = yy_n_chars = 0;

        else
                {
                int num_to_read =
                        yy_current_buffer->yy_buf_size - number_to_move - 1;

                while ( num_to_read <= 0 )
                        { /* Not enough room in the buffer - grow it. */
#ifdef YY_USES_REJECT
                        YY_FATAL_ERROR(
"input buffer overflow, can't enlarge buffer because scanner uses REJECT" );
#else

                        /* just a shorter name for the current buffer */
                        YY_BUFFER_STATE b = yy_current_buffer;

                        int yy_c_buf_p_offset =
                                (int) (yy_c_buf_p - b->yy_ch_buf);

                        if ( b->yy_is_our_buffer )
                                {
                                int new_size = b->yy_buf_size * 2;

                                if ( new_size <= 0 )
                                        b->yy_buf_size += b->yy_buf_size / 8;
                                else
                                        b->yy_buf_size *= 2;

                                b->yy_ch_buf = (char *)
                                        /* Include room in for 2 EOB chars. */
                                        yy_flex_realloc( (void *) b->yy_ch_buf,
                                                         b->yy_buf_size + 2 );
                                }
                        else
                                /* Can't grow it, we don't own it. */
                                b->yy_ch_buf = 0;

                        if ( ! b->yy_ch_buf )
                                YY_FATAL_ERROR(
                                "fatal error - scanner input buffer overflow" );

                        yy_c_buf_p = &b->yy_ch_buf[yy_c_buf_p_offset];

                        num_to_read = yy_current_buffer->yy_buf_size -
                                                number_to_move - 1;
#endif
                        }

                if ( num_to_read > YY_READ_BUF_SIZE )
                        num_to_read = YY_READ_BUF_SIZE;

                /* Read in more data. */
                YY_INPUT( (&yy_current_buffer->yy_ch_buf[number_to_move]),
                        yy_n_chars, num_to_read );

                yy_current_buffer->yy_n_chars = yy_n_chars;
                }

        if ( yy_n_chars == 0 )
                {
                if ( number_to_move == YY_MORE_ADJ )
                        {
                        ret_val = EOB_ACT_END_OF_FILE;
                        bgl_undir_restart( bgl_undir_in );
                        }

                else
                        {
                        ret_val = EOB_ACT_LAST_MATCH;
                        yy_current_buffer->yy_buffer_status =
                                YY_BUFFER_EOF_PENDING;
                        }
                }

        else
                ret_val = EOB_ACT_CONTINUE_SCAN;

        yy_n_chars += number_to_move;
        yy_current_buffer->yy_ch_buf[yy_n_chars] = YY_END_OF_BUFFER_CHAR;
        yy_current_buffer->yy_ch_buf[yy_n_chars + 1] = YY_END_OF_BUFFER_CHAR;

        bgl_undir_text_ptr = &yy_current_buffer->yy_ch_buf[0];

        return ret_val;
        }


/* yy_get_previous_state - get the state just before the EOB char was reached */

static yy_state_type yy_get_previous_state()
        {
        register yy_state_type yy_current_state;
        register char *yy_cp;

        yy_current_state = yy_start;

        for ( yy_cp = bgl_undir_text_ptr + YY_MORE_ADJ; yy_cp < yy_c_buf_p; ++yy_cp )
                {
                register YY_CHAR yy_c = (*yy_cp ? yy_ec[YY_SC_TO_UI(*yy_cp)] : 1);
                if ( yy_accept[yy_current_state] )
                        {
                        yy_last_accepting_state = yy_current_state;
                        yy_last_accepting_cpos = yy_cp;
                        }
                while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state )
                        {
                        yy_current_state = (int) yy_def[yy_current_state];
                        if ( yy_current_state >= 81 )
                                yy_c = yy_meta[(unsigned int) yy_c];
                        }
                yy_current_state = yy_nxt[yy_base[yy_current_state] + (unsigned int) yy_c];
                }

        return yy_current_state;
        }


/* yy_try_NUL_trans - try to make a transition on the NUL character
 *
 * synopsis
 *      next_state = yy_try_NUL_trans( current_state );
 */

#ifdef YY_USE_PROTOS
static yy_state_type yy_try_NUL_trans( yy_state_type yy_current_state )
#else
static yy_state_type yy_try_NUL_trans( yy_current_state )
yy_state_type yy_current_state;
#endif
        {
        register int yy_is_jam;
        register char *yy_cp = yy_c_buf_p;

        register YY_CHAR yy_c = 1;
        if ( yy_accept[yy_current_state] )
                {
                yy_last_accepting_state = yy_current_state;
                yy_last_accepting_cpos = yy_cp;
                }
        while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state )
                {
                yy_current_state = (int) yy_def[yy_current_state];
                if ( yy_current_state >= 81 )
                        yy_c = yy_meta[(unsigned int) yy_c];
                }
        yy_current_state = yy_nxt[yy_base[yy_current_state] + (unsigned int) yy_c];
        yy_is_jam = (yy_current_state == 80);

        return yy_is_jam ? 0 : yy_current_state;
        }


#ifndef YY_NO_UNPUT
#ifdef YY_USE_PROTOS
static void yyunput( int c, register char *yy_bp )
#else
static void yyunput( c, yy_bp )
int c;
register char *yy_bp;
#endif
        {
        register char *yy_cp = yy_c_buf_p;

        /* undo effects of setting up bgl_undir_text */
        *yy_cp = yy_hold_char;

        if ( yy_cp < yy_current_buffer->yy_ch_buf + 2 )
                { /* need to shift things up to make room */
                /* +2 for EOB chars. */
                register int number_to_move = yy_n_chars + 2;
                register char *dest = &yy_current_buffer->yy_ch_buf[
                                        yy_current_buffer->yy_buf_size + 2];
                register char *source =
                                &yy_current_buffer->yy_ch_buf[number_to_move];

                while ( source > yy_current_buffer->yy_ch_buf )
                        *--dest = *--source;

                yy_cp += (int) (dest - source);
                yy_bp += (int) (dest - source);
                yy_current_buffer->yy_n_chars =
                        yy_n_chars = yy_current_buffer->yy_buf_size;

                if ( yy_cp < yy_current_buffer->yy_ch_buf + 2 )
                        YY_FATAL_ERROR( "flex scanner push-back overflow" );
                }

        *--yy_cp = (char) c;


        bgl_undir_text_ptr = yy_bp;
        yy_hold_char = *yy_cp;
        yy_c_buf_p = yy_cp;
        }
#endif  /* ifndef YY_NO_UNPUT */


#ifdef __cplusplus
static int bgl_undir_input()
#else
static int input()
#endif
        {
        int c;

        *yy_c_buf_p = yy_hold_char;

        if ( *yy_c_buf_p == YY_END_OF_BUFFER_CHAR )
                {
                /* yy_c_buf_p now points to the character we want to return.
                 * If this occurs *before* the EOB characters, then it's a
                 * valid NUL; if not, then we've hit the end of the buffer.
                 */
                if ( yy_c_buf_p < &yy_current_buffer->yy_ch_buf[yy_n_chars] )
                        /* This was really a NUL. */
                        *yy_c_buf_p = '\0';

                else
                        { /* need more input */
                        int offset = yy_c_buf_p - bgl_undir_text_ptr;
                        ++yy_c_buf_p;

                        switch ( yy_get_next_buffer() )
                                {
                                case EOB_ACT_LAST_MATCH:
                                        /* This happens because yy_g_n_b()
                                         * sees that we've accumulated a
                                         * token and flags that we need to
                                         * try matching the token before
                                         * proceeding.  But for input(),
                                         * there's no matching to consider.
                                         * So convert the EOB_ACT_LAST_MATCH
                                         * to EOB_ACT_END_OF_FILE.
                                         */

                                        /* Reset buffer status. */
                                        bgl_undir_restart( bgl_undir_in );

                                        /* fall through */

                                case EOB_ACT_END_OF_FILE:
                                        {
                                        if ( yywrap() )
                                                return EOF;

                                        if ( ! yy_did_buffer_switch_on_eof )
                                                YY_NEW_FILE;
#ifdef __cplusplus
                                        return bgl_undir_input();
#else
                                        return input();
#endif
                                        }

                                case EOB_ACT_CONTINUE_SCAN:
                                        yy_c_buf_p = bgl_undir_text_ptr + offset;
                                        break;
                                }
                        }
                }

        c = *(unsigned char *) yy_c_buf_p;      /* cast for 8-bit char's */
        *yy_c_buf_p = '\0';     /* preserve bgl_undir_text */
        yy_hold_char = *++yy_c_buf_p;


        return c;
        }


#ifdef YY_USE_PROTOS
void bgl_undir_restart( FILE *input_file )
#else
void bgl_undir_restart( input_file )
FILE *input_file;
#endif
        {
        if ( ! yy_current_buffer )
                yy_current_buffer = bgl_undir_create_buffer( bgl_undir_in, YY_BUF_SIZE );

        bgl_undir_init_buffer( yy_current_buffer, input_file );
        bgl_undir_load_buffer_state();
        }