/[cvs]/stack/stack.c
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revision 1.76 by masse, Wed Feb 13 00:47:36 2002 UTC revision 1.80 by teddy, Thu Feb 14 12:20:09 2002 UTC
# Line 60  typedef struct { Line 60  typedef struct {
60    int err;                      /* Error flag */    int err;                      /* Error flag */
61    int non_eval_flag;    int non_eval_flag;
62    char *in_string;              /* Input pending to be read */    char *in_string;              /* Input pending to be read */
63      char *free_string;            /* Free this string when all input is
64                                       read from in_string */
65  } environment;  } environment;
66    
67  /* A type for pointers to external functions */  /* A type for pointers to external functions */
# Line 338  extern void type(environment *env){ Line 340  extern void type(environment *env){
340  }      }    
341    
342  /* Prints the top element of the stack. */  /* Prints the top element of the stack. */
343  void print_h(stackitem *stack_head)  void print_h(stackitem *stack_head, int noquote)
344  {  {
345    switch(stack_head->item->type) {    switch(stack_head->item->type) {
346    case integer:    case integer:
347      printf("%d", stack_head->item->content.val);      printf("%d", stack_head->item->content.val);
348      break;      break;
349    case string:    case string:
350      printf("%s", (char*)stack_head->item->content.ptr);      if(noquote)
351          printf("%s", (char*)stack_head->item->content.ptr);
352        else
353          printf("\"%s\"", (char*)stack_head->item->content.ptr);
354      break;      break;
355    case symb:    case symb:
356      printf("%s", ((symbol *)(stack_head->item->content.ptr))->id);      printf("%s", ((symbol *)(stack_head->item->content.ptr))->id);
# Line 358  void print_h(stackitem *stack_head) Line 363  void print_h(stackitem *stack_head)
363      stack_head=(stackitem *)(stack_head->item->content.ptr);      stack_head=(stackitem *)(stack_head->item->content.ptr);
364      printf("[ ");      printf("[ ");
365      while(stack_head != NULL) {      while(stack_head != NULL) {
366        print_h(stack_head);        print_h(stack_head, noquote);
367        printf(" ");        printf(" ");
368        stack_head=stack_head->next;        stack_head=stack_head->next;
369      }      }
# Line 373  extern void print_(environment *env) { Line 378  extern void print_(environment *env) {
378      env->err=1;      env->err=1;
379      return;      return;
380    }    }
381    print_h(env->head);    print_h(env->head, 0);
382      nl();
383  }  }
384    
385  /* Prints the top element of the stack and then discards it. */  /* Prints the top element of the stack and then discards it. */
# Line 384  extern void print(environment *env) Line 390  extern void print(environment *env)
390    toss(env);    toss(env);
391  }  }
392    
393    extern void princ_(environment *env) {
394      if(env->head==NULL) {
395        printerr("Too Few Arguments");
396        env->err=1;
397        return;
398      }
399      print_h(env->head, 1);
400    }
401    
402    /* Prints the top element of the stack and then discards it. */
403    extern void princ(environment *env)
404    {
405      princ_(env);
406      if(env->err) return;
407      toss(env);
408    }
409    
410  /* Only to be called by function printstack. */  /* Only to be called by function printstack. */
411  void print_st(stackitem *stack_head, long counter)  void print_st(stackitem *stack_head, long counter)
412  {  {
413    if(stack_head->next != NULL)    if(stack_head->next != NULL)
414      print_st(stack_head->next, counter+1);      print_st(stack_head->next, counter+1);
415    printf("%ld: ", counter);    printf("%ld: ", counter);
416    print_h(stack_head);    print_h(stack_head, 0);
417    nl();    nl();
418  }  }
419    
# Line 398  void print_st(stackitem *stack_head, lon Line 421  void print_st(stackitem *stack_head, lon
421  extern void printstack(environment *env)  extern void printstack(environment *env)
422  {  {
423    if(env->head == NULL) {    if(env->head == NULL) {
424        printf("Stack Empty\n");
425      return;      return;
426    }    }
427    print_st(env->head, 1);    print_st(env->head, 1);
   nl();  
428  }  }
429    
430  /* Swap the two top elements on the stack. */  /* Swap the two top elements on the stack. */
# Line 474  extern void eval(environment *env) Line 497  extern void eval(environment *env)
497    value* temp_val;    value* temp_val;
498    stackitem* iterator;    stackitem* iterator;
499    
500     eval_start:
501    
502    if(env->head==NULL) {    if(env->head==NULL) {
503      printerr("Too Few Arguments");      printerr("Too Few Arguments");
504      env->err=1;      env->err=1;
505      return;      return;
506    }    }
507    
  eval_start:  
   
508    switch(env->head->item->type) {    switch(env->head->item->type) {
509      /* if it's a symbol */      /* if it's a symbol */
510    case symb:    case symb:
# Line 531  extern void eval(environment *env) Line 554  extern void eval(environment *env)
554    
555  /* Reverse (flip) a list */  /* Reverse (flip) a list */
556  extern void rev(environment *env){  extern void rev(environment *env){
557    stackitem *item, *temp, *prev= NULL;    stackitem *old_head, *new_head, *item;
558    
559    if((env->head)==NULL) {    if((env->head)==NULL) {
560      printerr("Too Few Arguments");      printerr("Too Few Arguments");
# Line 545  extern void rev(environment *env){ Line 568  extern void rev(environment *env){
568      return;      return;
569    }    }
570    
571    item= (stackitem *)(env->head->item->content.ptr);    old_head=(stackitem *)(env->head->item->content.ptr);
572    while(item->next!=NULL){    new_head=NULL;
573      temp= item->next;    while(old_head != NULL){
574      item->next= prev;      item=old_head;
575      prev= item;      old_head=old_head->next;
576      item= temp;      item->next=new_head;
577        new_head=item;
578    }    }
579    item->next= prev;    env->head->item->content.ptr=new_head;
   
   env->head->item->content.ptr=item;  
580  }  }
581    
582  /* Make a list. */  /* Make a list. */
# Line 717  extern void def(environment *env) Line 739  extern void def(environment *env)
739    toss(env); toss(env);    toss(env); toss(env);
740  }  }
741    
742    extern void clear(environment *);
743    void forget_sym(symbol **);
744    
745  /* Quit stack. */  /* Quit stack. */
746  extern void quit(environment *env)  extern void quit(environment *env)
747  {  {
748      long i;
749    
750      clear(env);
751      if (env->err) return;
752      for(i= 0; i<HASHTBLSIZE; i++) {
753        while(env->symbols[i]!= NULL) {
754          forget_sym(&(env->symbols[i]));
755        }
756        env->symbols[i]= NULL;
757      }
758    exit(EXIT_SUCCESS);    exit(EXIT_SUCCESS);
759  }  }
760    
# Line 745  extern void words(environment *env) Line 780  extern void words(environment *env)
780    }    }
781  }  }
782    
783    /* Internal forget function */
784    void forget_sym(symbol **hash_entry) {
785      symbol *temp;
786    
787      temp= *hash_entry;
788      *hash_entry= (*hash_entry)->next;
789      
790      if(temp->val!=NULL) {
791        free_val(temp->val);
792      }
793      free(temp->id);
794      free(temp);
795    }
796    
797  /* Forgets a symbol (remove it from the hash table) */  /* Forgets a symbol (remove it from the hash table) */
798  extern void forget(environment *env)  extern void forget(environment *env)
799  {  {
800    char* sym_id;    char* sym_id;
801    stackitem *stack_head= env->head;    stackitem *stack_head= env->head;
   symbol **hash_entry, *temp;  
802    
803    if(stack_head==NULL) {    if(stack_head==NULL) {
804      printerr("Too Few Arguments");      printerr("Too Few Arguments");
# Line 767  extern void forget(environment *env) Line 815  extern void forget(environment *env)
815    sym_id= ((symbol*)(stack_head->item->content.ptr))->id;    sym_id= ((symbol*)(stack_head->item->content.ptr))->id;
816    toss(env);    toss(env);
817    
818    hash_entry= hash(env->symbols, sym_id);    return forget_sym(hash(env->symbols, sym_id));
   temp= *hash_entry;  
   *hash_entry= (*hash_entry)->next;  
     
   if(temp->val!=NULL) {  
     free_val(temp->val);  
   }  
   free(temp->id);  
   free(temp);  
819  }  }
820    
821  /* Returns the current error number to the stack */  /* Returns the current error number to the stack */
# Line 792  int main() Line 832  int main()
832    init_env(&myenv);    init_env(&myenv);
833    
834    while(1) {    while(1) {
835      if(myenv.in_string==NULL)      if(myenv.in_string==NULL) {
836          nl();
837        printstack(&myenv);        printstack(&myenv);
838          printf("> ");
839        }
840      read(&myenv);      read(&myenv);
841      if(myenv.err) {      if(myenv.err) {
842        printf("(error %d) ", myenv.err);        printf("(error %d) ", myenv.err);
# Line 1177  extern void readline(environment *env) { Line 1220  extern void readline(environment *env) {
1220    
1221  /* Read a value and place on stack */  /* Read a value and place on stack */
1222  extern void read(environment *env) {  extern void read(environment *env) {
1223    const char symbform[]= "%[a-zA-Z0-9!$%*+./:<=>?@^_~-]%[\001-\377]";    const char symbform[]= "%[a-zA-Z0-9!$%*+./:<=>?@^_~-]%n";
1224    const char strform[]= "\"%[^\"]\"%[\001-\377]";    const char strform[]= "\"%[^\"]\"%n";
1225    const char intform[]= "%i%[\001-\377]";    const char intform[]= "%i%n";
1226    const char blankform[]= "%*[ \t]%[\001-\377]";    const char blankform[]= "%*[ \t]%n";
1227    const char ebrackform[]= "%*1[]]%[\001-\377]";    const char ebrackform[]= "%*1[]]%n";
1228    const char semicform[]= "%*1[;]%[\001-\377]";    const char semicform[]= "%*1[;]%n";
1229    const char bbrackform[]= "%*1[[]%[\001-\377]";    const char bbrackform[]= "%*1[[]%n";
1230    
1231    int itemp;    int itemp, readlength= -1;
1232    static int depth= 0;    static int depth= 0;
1233    char *rest, *match;    char *rest, *match;
1234    size_t inlength;    size_t inlength;
1235    
1236    if(env->in_string==NULL) {    if(env->in_string==NULL) {
1237        if(depth > 0) {
1238          printf("]> ");
1239        }
1240      readline(env); if(env->err) return;      readline(env); if(env->err) return;
1241            
1242      env->in_string= malloc(strlen(env->head->item->content.ptr)+1);      env->in_string= malloc(strlen(env->head->item->content.ptr)+1);
1243        env->free_string= env->in_string; /* Save the original pointer */
1244      strcpy(env->in_string, env->head->item->content.ptr);      strcpy(env->in_string, env->head->item->content.ptr);
1245      toss(env); if(env->err) return;      toss(env); if(env->err) return;
1246    }    }
# Line 1202  extern void read(environment *env) { Line 1249  extern void read(environment *env) {
1249    match= malloc(inlength);    match= malloc(inlength);
1250    rest= malloc(inlength);    rest= malloc(inlength);
1251    
1252    if(sscanf(env->in_string, blankform, rest)) {    if(sscanf(env->in_string, blankform, &readlength)!=EOF
1253         && readlength != -1) {
1254      ;      ;
1255    } else if(sscanf(env->in_string, intform, &itemp, rest) > 0) {    } else if(sscanf(env->in_string, intform, &itemp, &readlength) != EOF
1256                && readlength != -1) {
1257      push_int(env, itemp);      push_int(env, itemp);
1258    } else if(sscanf(env->in_string, strform, match, rest) > 0) {    } else if(sscanf(env->in_string, strform, match, &readlength) != EOF
1259                && readlength != -1) {
1260      push_cstring(env, match);      push_cstring(env, match);
1261    } else if(sscanf(env->in_string, symbform, match, rest) > 0) {    } else if(sscanf(env->in_string, symbform, match, &readlength) != EOF
1262                && readlength != -1) {
1263      push_sym(env, match);      push_sym(env, match);
1264    } else if(sscanf(env->in_string, ebrackform, rest) > 0) {    } else if(sscanf(env->in_string, ebrackform, &readlength) != EOF
1265                && readlength != -1) {
1266      pack(env); if(env->err) return;      pack(env); if(env->err) return;
1267      if(depth!=0) depth--;      if(depth != 0) depth--;
1268    } else if(sscanf(env->in_string, semicform, rest) > 0) {    } else if(sscanf(env->in_string, semicform, &readlength) != EOF
1269                && readlength != -1) {
1270      push_sym(env, ";");      push_sym(env, ";");
1271    } else if(sscanf(env->in_string, bbrackform, rest) > 0) {    } else if(sscanf(env->in_string, bbrackform, &readlength) != EOF
1272                && readlength != -1) {
1273      push_sym(env, "[");      push_sym(env, "[");
1274      depth++;      depth++;
1275    } else {    } else {
1276      free(rest);      free(env->free_string);
1277      rest= NULL;      env->in_string = env->free_string = NULL;
1278        free(match);
1279      }
1280      if ( env->in_string != NULL) {
1281        env->in_string += readlength;
1282    }    }
         
   free(env->in_string);  
   free(match);  
   
   env->in_string= rest;  
1283    
1284    if(depth)    if(depth)
1285      return read(env);      return read(env);
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