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|
#include <stdio.h>
#include <Foundation/Foundation.h>
struct LangEl
{
int key;
char *name;
};
@interface Fsm : NSObject
{
@public
int cs;
};
// Initialize the machine. Invokes any init statement blocks. Returns 0
// if the machine begins in a non-accepting state and 1 if the machine
// begins in an accepting state.
- (int) initFsm;
// Execute the machine on a block of data. Returns -1 if after processing
// the data, the machine is in the error state and can never accept, 0 if
// the machine is in a non-accepting state and 1 if the machine is in an
// accepting state.
- (int) executeWithData:( struct LangEl *)data len:(int)len;
// Indicate that there is no more data. Returns -1 if the machine finishes
// in the error state and does not accept, 0 if the machine finishes
// in any other non-accepting state and 1 if the machine finishes in an
// accepting state.
- (int) finish;
@end;
@implementation Fsm
static const char _Fsm_actions [] = { 0, 1, 0, 1, 1, 0 , };
static const int _Fsm_trans_keys [] = { 1, 0, 0, 0, 1, 2, 1, 0, 0 , };
static const char _Fsm_char_class [] = { 0, 1, 2, 0 , };
static const char _Fsm_index_offsets [] = { 0, 0, 1, 3, 0 , };
static const char _Fsm_indices [] = { 0, 0, 2, 0 , };
static const char _Fsm_index_defaults [] = { 0, 1, 1, 1, 0 , };
static const char _Fsm_trans_cond_spaces [] = { -1, -1, -1, 0 , };
static const char _Fsm_cond_targs [] = { 2, 0, 3, 0 , };
static const char _Fsm_cond_actions [] = { 1, 0, 1, 0 , };
static const char _Fsm_eof_actions [] = { 0, 0, 0, 3, 0 , };
static const char _Fsm_nfa_targs [] = { 0, 0 , };
static const char _Fsm_nfa_offsets [] = { 0, 0, 0, 0, 0 , };
static const char _Fsm_nfa_push_actions [] = { 0, 0 , };
static const char _Fsm_nfa_pop_trans [] = { 0, 0 , };
static const int Fsm_start = 1;
static const int Fsm_first_final = 3;
static const int Fsm_error = 0;
static const int Fsm_en_main = 1;
- (int) initFsm;
{
{
cs = ( int ) Fsm_start;
}
return 0;
}
- (int) executeWithData:( struct LangEl *)_data len:(int)_len;
{
struct LangEl *p = _data;
struct LangEl *pe = _data + _len;
struct LangEl *eof = pe;
{
int _trans = 0;
const char *_acts;
unsigned int _nacts;
const int *_keys;
const char *_inds;
if ( p == pe )
goto _test_eof;
if ( cs == 0 )
goto _out;
_resume :
_keys = _Fsm_trans_keys + (cs<<1);
_inds = _Fsm_indices + _Fsm_index_offsets[cs];
if ( (p->key) <= 3 && (p->key) >= 1 )
{
int _ic = ( int ) _Fsm_char_class[( int ) (p->key) - 1];
if ( _ic <= ( int ) (*( _keys+1 ))
&& _ic >= ( int ) (*( _keys ))
)
_trans = ( int ) (*( _inds + ( int ) (_ic - ( int ) (*( _keys ))
) ))
;
else
_trans = ( int ) _Fsm_index_defaults[cs];
}
else
{
_trans = ( int ) _Fsm_index_defaults[cs];
}
goto _match_cond;
_match_cond :
cs = ( int ) _Fsm_cond_targs[_trans];
if ( _Fsm_cond_actions[_trans]== 0 )
goto _again;
_acts = _Fsm_actions + _Fsm_cond_actions[_trans];
_nacts = ( unsigned int ) (*( _acts ))
;
_acts += 1;
while ( _nacts > 0 )
{
switch ( (*( _acts ))
) {
case 0 :
{
printf("%s\n", p->name);
}
break;
}
_nacts -= 1;
_acts += 1;
}
_again :
if ( cs == 0 )
goto _out;
p += 1;
if ( p != pe )
goto _resume;
_test_eof :
{}
if ( p == eof )
{
const char *__acts;
unsigned int __nacts;
__acts = _Fsm_actions + _Fsm_eof_actions[cs];
__nacts = ( unsigned int ) (*( __acts ))
;
__acts += 1;
while ( __nacts > 0 )
{
switch ( (*( __acts ))
) {
case 1 :
{
printf("accept\n");
}
break;
}
__nacts -= 1;
__acts += 1;
}
}
_out :
{}
}
if ( self->cs == Fsm_error )
return -1;
return ( self->cs >= Fsm_first_final ) ? 1 : 0;
}
- (int) finish;
{
if ( self->cs == Fsm_error )
return -1;
return ( self->cs >= Fsm_first_final ) ? 1 : 0;
}
@end
int main()
{
static Fsm *fsm;
static struct LangEl lel[] = {
{1, "one"},
{2, "two-a"},
{2, "two-b"},
{2, "two-c"},
{3, "three"}
};
fsm = [[Fsm alloc] init];
[fsm initFsm];
[fsm executeWithData:lel len:5];
[fsm finish];
return 0;
}
@interface Fsm2 : NSObject
{
// The current state may be read and written to from outside of the
// machine. From within action code, curs is -1 and writing to it has no
// effect.
@public
int cs;
@protected
}
// Execute the machine on a block of data. Returns -1 if after processing
// the data, the machine is in the error state and can never accept, 0 if
// the machine is in a non-accepting state and 1 if the machine is in an
// accepting state.
- (int)
executeWithElements:(int) elements
length:(unsigned)length;
@end
@implementation Fsm2
- (int)
executeWithElements:(int)elements
length:(unsigned)length;
{
return 0;
}
@end
|
