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/*
* @LANG: obj-c
*/
#include <stdio.h>
#include <objc/Object.h>
struct LangEl
{
int key;
char *name;
};
@interface Fsm : Object
{
@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
%%{
machine Fsm;
alphtype int;
getkey fpc->key;
action a1 {}
action a2 {}
action a3 {}
main := ( 1 2* 3 )
${printf("%s\n", fpc->name);}
%/{printf("accept\n");};
}%%
%% write data;
- (int) initFsm;
{
%% write init;
return 0;
}
- (int) executeWithData:( struct LangEl *)_data len:(int)_len;
{
struct LangEl *p = _data;
struct LangEl *pe = _data + _len;
struct LangEl *eof = pe;
%% write exec;
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 : Object
{
// 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
#ifdef _____OUTPUT_____
one
two-a
two-b
two-c
three
accept
#endif
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