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

#ifdef YY_USE_PROTOS
void bgl_undir_switch_to_buffer( YY_BUFFER_STATE new_buffer )
#else
void bgl_undir_switch_to_buffer( new_buffer )
YY_BUFFER_STATE new_buffer;
#endif
        {
        if ( yy_current_buffer == new_buffer )
                return;

        if ( yy_current_buffer )
                {
                /* Flush out information for old buffer. */
                *yy_c_buf_p = yy_hold_char;
                yy_current_buffer->yy_buf_pos = yy_c_buf_p;
                yy_current_buffer->yy_n_chars = yy_n_chars;
                }

        yy_current_buffer = new_buffer;
        bgl_undir_load_buffer_state();

        /* We don't actually know whether we did this switch during
         * EOF (yywrap()) processing, but the only time this flag
         * is looked at is after yywrap() is called, so it's safe
         * to go ahead and always set it.
         */
        yy_did_buffer_switch_on_eof = 1;
        }


#ifdef YY_USE_PROTOS
void bgl_undir_load_buffer_state( void )
#else
void bgl_undir_load_buffer_state()
#endif
        {
        yy_n_chars = yy_current_buffer->yy_n_chars;
        bgl_undir_text_ptr = yy_c_buf_p = yy_current_buffer->yy_buf_pos;
        bgl_undir_in = yy_current_buffer->yy_input_file;
        yy_hold_char = *yy_c_buf_p;
        }


#ifdef YY_USE_PROTOS
YY_BUFFER_STATE bgl_undir_create_buffer( FILE *file, int size )
#else
YY_BUFFER_STATE bgl_undir_create_buffer( file, size )
FILE *file;
int size;
#endif
        {
        YY_BUFFER_STATE b;

        b = (YY_BUFFER_STATE) yy_flex_alloc( sizeof( struct yy_buffer_state ) );
        if ( ! b )
                YY_FATAL_ERROR( "out of dynamic memory in bgl_undir_create_buffer()" );

        b->yy_buf_size = size;

        /* yy_ch_buf has to be 2 characters longer than the size given because
         * we need to put in 2 end-of-buffer characters.
         */
        b->yy_ch_buf = (char *) yy_flex_alloc( b->yy_buf_size + 2 );
        if ( ! b->yy_ch_buf )
                YY_FATAL_ERROR( "out of dynamic memory in bgl_undir_create_buffer()" );

        b->yy_is_our_buffer = 1;

        bgl_undir_init_buffer( b, file );

        return b;
        }


#ifdef YY_USE_PROTOS
void bgl_undir_delete_buffer( YY_BUFFER_STATE b )
#else
void bgl_undir_delete_buffer( b )
YY_BUFFER_STATE b;
#endif
        {
        if ( ! b )
                return;

        if ( b == yy_current_buffer )
                yy_current_buffer = (YY_BUFFER_STATE) 0;

        if ( b->yy_is_our_buffer )
                yy_flex_free( (void *) b->yy_ch_buf );

        yy_flex_free( (void *) b );
        }



#ifdef YY_USE_PROTOS
void bgl_undir_init_buffer( YY_BUFFER_STATE b, FILE *file )
#else
void bgl_undir_init_buffer( b, file )
YY_BUFFER_STATE b;
FILE *file;
#endif


        {
        bgl_undir_flush_buffer( b );

        b->yy_input_file = file;
        b->yy_fill_buffer = 1;

#if YY_ALWAYS_INTERACTIVE
        b->yy_is_interactive = 1;
#else
#if YY_NEVER_INTERACTIVE
        b->yy_is_interactive = 0;
#else
        b->yy_is_interactive = file ? (isatty( fileno(file) ) > 0) : 0;
#endif
#endif
        }


#ifdef YY_USE_PROTOS
void bgl_undir_flush_buffer( YY_BUFFER_STATE b )
#else
void bgl_undir_flush_buffer( b )
YY_BUFFER_STATE b;
#endif

        {
        if ( ! b )
                return;

        b->yy_n_chars = 0;

        /* We always need two end-of-buffer characters.  The first causes
         * a transition to the end-of-buffer state.  The second causes
         * a jam in that state.
         */
        b->yy_ch_buf[0] = YY_END_OF_BUFFER_CHAR;
        b->yy_ch_buf[1] = YY_END_OF_BUFFER_CHAR;

        b->yy_buf_pos = &b->yy_ch_buf[0];

        b->yy_at_bol = 1;
        b->yy_buffer_status = YY_BUFFER_NEW;

        if ( b == yy_current_buffer )
                bgl_undir_load_buffer_state();
        }


#ifndef YY_NO_SCAN_BUFFER
#ifdef YY_USE_PROTOS
YY_BUFFER_STATE bgl_undir_scan_buffer( char *base, yy_size_t size )
#else
YY_BUFFER_STATE bgl_undir_scan_buffer( base, size )
char *base;
yy_size_t size;
#endif
        {
        YY_BUFFER_STATE b;

        if ( size < 2 ||
             base[size-2] != YY_END_OF_BUFFER_CHAR ||
             base[size-1] != YY_END_OF_BUFFER_CHAR )
                /* They forgot to leave room for the EOB's. */
                return 0;

        b = (YY_BUFFER_STATE) yy_flex_alloc( sizeof( struct yy_buffer_state ) );
        if ( ! b )
                YY_FATAL_ERROR( "out of dynamic memory in bgl_undir_scan_buffer()" );

        b->yy_buf_size = size - 2;      /* "- 2" to take care of EOB's */
        b->yy_buf_pos = b->yy_ch_buf = base;
        b->yy_is_our_buffer = 0;
        b->yy_input_file = 0;
        b->yy_n_chars = b->yy_buf_size;
        b->yy_is_interactive = 0;
        b->yy_at_bol = 1;
        b->yy_fill_buffer = 0;
        b->yy_buffer_status = YY_BUFFER_NEW;

        bgl_undir_switch_to_buffer( b );

        return b;
        }
#endif


#ifndef YY_NO_SCAN_STRING
#ifdef YY_USE_PROTOS
YY_BUFFER_STATE bgl_undir_scan_string( yyconst char *yy_str )
#else
YY_BUFFER_STATE bgl_undir_scan_string( yy_str )
yyconst char *yy_str;
#endif
        {
        int len;
        for ( len = 0; yy_str[len]; ++len )
                ;

        return bgl_undir_scan_bytes( yy_str, len );
        }
#endif


#ifndef YY_NO_SCAN_BYTES
#ifdef YY_USE_PROTOS
YY_BUFFER_STATE bgl_undir_scan_bytes( yyconst char *bytes, int len )
#else
YY_BUFFER_STATE bgl_undir_scan_bytes( bytes, len )
yyconst char *bytes;
int len;
#endif
        {
        YY_BUFFER_STATE b;
        char *buf;
        yy_size_t n;
        int i;

        /* Get memory for full buffer, including space for trailing EOB's. */
        n = len + 2;
        buf = (char *) yy_flex_alloc( n );
        if ( ! buf )
                YY_FATAL_ERROR( "out of dynamic memory in bgl_undir_scan_bytes()" );

        for ( i = 0; i < len; ++i )
                buf[i] = bytes[i];

        buf[len] = buf[len+1] = YY_END_OF_BUFFER_CHAR;

        b = bgl_undir_scan_buffer( buf, n );
        if ( ! b )
                YY_FATAL_ERROR( "bad buffer in bgl_undir_scan_bytes()" );

        /* It's okay to grow etc. this buffer, and we should throw it
         * away when we're done.
         */
        b->yy_is_our_buffer = 1;

        return b;
        }
#endif


#ifndef YY_NO_PUSH_STATE
#ifdef YY_USE_PROTOS
static void yy_push_state( int new_state )
#else
static void yy_push_state( new_state )
int new_state;
#endif
        {
        if ( yy_start_stack_ptr >= yy_start_stack_depth )
                {
                yy_size_t new_size;

                yy_start_stack_depth += YY_START_STACK_INCR;
                new_size = yy_start_stack_depth * sizeof( int );

                if ( ! yy_start_stack )
                        yy_start_stack = (int *) yy_flex_alloc( new_size );

                else
                        yy_start_stack = (int *) yy_flex_realloc(
                                        (void *) yy_start_stack, new_size );

                if ( ! yy_start_stack )
                        YY_FATAL_ERROR(
                        "out of memory expanding start-condition stack" );
                }

        yy_start_stack[yy_start_stack_ptr++] = YY_START;

        BEGIN(new_state);
        }
#endif


#ifndef YY_NO_POP_STATE
static void yy_pop_state()
        {
        if ( --yy_start_stack_ptr < 0 )
                YY_FATAL_ERROR( "start-condition stack underflow" );

        BEGIN(yy_start_stack[yy_start_stack_ptr]);
        }
#endif


#ifndef YY_NO_TOP_STATE
static int yy_top_state()
        {
        return yy_start_stack[yy_start_stack_ptr - 1];
        }
#endif

#ifndef YY_EXIT_FAILURE
#define YY_EXIT_FAILURE 2
#endif

#ifdef YY_USE_PROTOS
static void yy_fatal_error( yyconst char msg[] )
#else
static void yy_fatal_error( msg )
char msg[];
#endif
        {
        (void) fprintf( stderr, "%s\n", msg );
        exit( YY_EXIT_FAILURE );
        }



/* Redefine yyless() so it works in section 3 code. */

#undef yyless
#define yyless(n) \
        do \
                { \
                /* Undo effects of setting up bgl_undir_text. */ \
                bgl_undir_text[bgl_undir_leng] = yy_hold_char; \
                yy_c_buf_p = bgl_undir_text + n; \
                yy_hold_char = *yy_c_buf_p; \
                *yy_c_buf_p = '\0'; \
                bgl_undir_leng = n; \
                } \
        while ( 0 )


/* Internal utility routines. */

#ifndef bgl_undir_text_ptr
#ifdef YY_USE_PROTOS
static void yy_flex_strncpy( char *s1, yyconst char *s2, int n )
#else
static void yy_flex_strncpy( s1, s2, n )
char *s1;
yyconst char *s2;
int n;
#endif
        {
        register int i;
        for ( i = 0; i < n; ++i )
                s1[i] = s2[i];
        }
#endif

#ifdef YY_NEED_STRLEN
#ifdef YY_USE_PROTOS
static int yy_flex_strlen( yyconst char *s )
#else
static int yy_flex_strlen( s )
yyconst char *s;
#endif
        {
        register int n;
        for ( n = 0; s[n]; ++n )
                ;

        return n;
        }
#endif


#ifdef YY_USE_PROTOS
static void *yy_flex_alloc( yy_size_t size )
#else
static void *yy_flex_alloc( size )
yy_size_t size;
#endif
        {
        return (void *) malloc( size );
        }

#ifdef YY_USE_PROTOS
static void *yy_flex_realloc( void *ptr, yy_size_t size )
#else
static void *yy_flex_realloc( ptr, size )
void *ptr;
yy_size_t size;
#endif
        {
        /* The cast to (char *) in the following accommodates both
         * implementations that use char* generic pointers, and those
         * that use void* generic pointers.  It works with the latter
         * because both ANSI C and C++ allow castless assignment from
         * any pointer type to void*, and deal with argument conversions
         * as though doing an assignment.
         */
        return (void *) realloc( (char *) ptr, size );
        }

#ifdef YY_USE_PROTOS
static void yy_flex_free( void *ptr )
#else
static void yy_flex_free( ptr )
void *ptr;
#endif
        {
        free( ptr );
        }

#if YY_MAIN
int main()
        {
        bgl_undir_lex();
        return 0;
        }
#endif
#line 73 "graphviz_lex.l"



void begin_literal() {
   literal = "";
}

void add_string(const char* str) {
   literal += str;
}

void end_literal() {
}

void bgl_undir_error(char *str)
{
  std::cout << str << std::endl;
}