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revision 1.75 by masse, Wed Feb 13 00:16:00 2002 UTC revision 1.81 by masse, Thu Feb 14 19:20:28 2002 UTC
# Line 58  typedef struct { Line 58  typedef struct {
58    stackitem *head;              /* Head of the stack */    stackitem *head;              /* Head of the stack */
59    hashtbl symbols;              /* Hash table of all variable bindings */    hashtbl symbols;              /* Hash table of all variable bindings */
60    int err;                      /* Error flag */    int err;                      /* Error flag */
   int non_eval_flag;  
61    char *in_string;              /* Input pending to be read */    char *in_string;              /* Input pending to be read */
62      char *free_string;            /* Free this string when all input is
63                                       read from in_string */
64  } environment;  } environment;
65    
66  /* A type for pointers to external functions */  /* A type for pointers to external functions */
# Line 73  void init_env(environment *env) Line 74  void init_env(environment *env)
74    
75    env->in_string= NULL;    env->in_string= NULL;
76    env->err= 0;    env->err= 0;
   env->non_eval_flag= 0;  
77    for(i= 0; i<HASHTBLSIZE; i++)    for(i= 0; i<HASHTBLSIZE; i++)
78      env->symbols[i]= NULL;      env->symbols[i]= NULL;
79  }  }
# Line 100  void free_val(value *val){ Line 100  void free_val(value *val){
100          free(item);             /* free the stackitem */          free(item);             /* free the stackitem */
101          item=temp;              /* go to next stackitem */          item=temp;              /* go to next stackitem */
102        }        }
       free(val);                /* Free the actual list value */  
103        break;        break;
104      case integer:      case integer:
105      case func:      case func:
106      case symb:      case symb:
107        break;        break;
108      }      }
109        if(val->id!=NULL)
110          free(val->id);
111        free(val);          /* Free the actual list value */
112    }    }
113  }  }
114    
# Line 172  void push_int(environment *env, int in_v Line 174  void push_int(environment *env, int in_v
174        
175    new_value->content.val= in_val;    new_value->content.val= in_val;
176    new_value->type= integer;    new_value->type= integer;
177    new_value->refcount=1;    new_value->refcount= 1;
178      new_value->id= NULL;
179    
180    push_val(env, new_value);    push_val(env, new_value);
181  }  }
# Line 185  void push_cstring(environment *env, cons Line 188  void push_cstring(environment *env, cons
188    new_value->content.ptr= malloc(strlen(in_string)+1);    new_value->content.ptr= malloc(strlen(in_string)+1);
189    strcpy(new_value->content.ptr, in_string);    strcpy(new_value->content.ptr, in_string);
190    new_value->type= string;    new_value->type= string;
191    new_value->refcount=1;    new_value->refcount= 1;
192      new_value->id= NULL;
193    
194    push_val(env, new_value);    push_val(env, new_value);
195  }  }
# Line 211  char *mangle_str(const char *old_string) Line 215  char *mangle_str(const char *old_string)
215  }  }
216    
217  extern void mangle(environment *env){  extern void mangle(environment *env){
   value *new_value;  
218    char *new_string;    char *new_string;
219    
220    if((env->head)==NULL) {    if((env->head)==NULL) {
# Line 231  extern void mangle(environment *env){ Line 234  extern void mangle(environment *env){
234    toss(env);    toss(env);
235    if(env->err) return;    if(env->err) return;
236    
237    new_value= malloc(sizeof(value));    push_cstring(env, new_string);
   new_value->content.ptr= new_string;  
   new_value->type= string;  
   new_value->refcount=1;  
   
   push_val(env, new_value);  
238  }  }
239    
240  /* Push a symbol onto the stack. */  /* Push a symbol onto the stack. */
# Line 338  extern void type(environment *env){ Line 336  extern void type(environment *env){
336  }      }    
337    
338  /* Prints the top element of the stack. */  /* Prints the top element of the stack. */
339  void print_h(stackitem *stack_head)  void print_h(stackitem *stack_head, int noquote)
340  {  {
341    switch(stack_head->item->type) {    switch(stack_head->item->type) {
342    case integer:    case integer:
343      printf("%d", stack_head->item->content.val);      printf("%d", stack_head->item->content.val);
344      break;      break;
345    case string:    case string:
346      printf("%s", (char*)stack_head->item->content.ptr);      if(noquote)
347          printf("%s", (char*)stack_head->item->content.ptr);
348        else
349          printf("\"%s\"", (char*)stack_head->item->content.ptr);
350      break;      break;
351    case symb:    case symb:
352      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 359  void print_h(stackitem *stack_head)
359      stack_head=(stackitem *)(stack_head->item->content.ptr);      stack_head=(stackitem *)(stack_head->item->content.ptr);
360      printf("[ ");      printf("[ ");
361      while(stack_head != NULL) {      while(stack_head != NULL) {
362        print_h(stack_head);        print_h(stack_head, noquote);
363        printf(" ");        printf(" ");
364        stack_head=stack_head->next;        stack_head=stack_head->next;
365      }      }
# Line 373  extern void print_(environment *env) { Line 374  extern void print_(environment *env) {
374      env->err=1;      env->err=1;
375      return;      return;
376    }    }
377    print_h(env->head);    print_h(env->head, 0);
378      nl();
379  }  }
380    
381  /* 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 386  extern void print(environment *env)
386    toss(env);    toss(env);
387  }  }
388    
389    extern void princ_(environment *env) {
390      if(env->head==NULL) {
391        printerr("Too Few Arguments");
392        env->err=1;
393        return;
394      }
395      print_h(env->head, 1);
396    }
397    
398    /* Prints the top element of the stack and then discards it. */
399    extern void princ(environment *env)
400    {
401      princ_(env);
402      if(env->err) return;
403      toss(env);
404    }
405    
406  /* Only to be called by function printstack. */  /* Only to be called by function printstack. */
407  void print_st(stackitem *stack_head, long counter)  void print_st(stackitem *stack_head, long counter)
408  {  {
409    if(stack_head->next != NULL)    if(stack_head->next != NULL)
410      print_st(stack_head->next, counter+1);      print_st(stack_head->next, counter+1);
411    printf("%ld: ", counter);    printf("%ld: ", counter);
412    print_h(stack_head);    print_h(stack_head, 0);
413    nl();    nl();
414  }  }
415    
# Line 398  void print_st(stackitem *stack_head, lon Line 417  void print_st(stackitem *stack_head, lon
417  extern void printstack(environment *env)  extern void printstack(environment *env)
418  {  {
419    if(env->head == NULL) {    if(env->head == NULL) {
420        printf("Stack Empty\n");
421      return;      return;
422    }    }
423    print_st(env->head, 1);    print_st(env->head, 1);
   nl();  
424  }  }
425    
426  /* Swap the two top elements on the stack. */  /* Swap the two top elements on the stack. */
# Line 474  extern void eval(environment *env) Line 493  extern void eval(environment *env)
493    value* temp_val;    value* temp_val;
494    stackitem* iterator;    stackitem* iterator;
495    
496     eval_start:
497    
498    if(env->head==NULL) {    if(env->head==NULL) {
499      printerr("Too Few Arguments");      printerr("Too Few Arguments");
500      env->err=1;      env->err=1;
501      return;      return;
502    }    }
503    
  eval_start:  
   
504    switch(env->head->item->type) {    switch(env->head->item->type) {
505      /* if it's a symbol */      /* if it's a symbol */
506    case symb:    case symb:
# Line 716  extern void def(environment *env) Line 735  extern void def(environment *env)
735    toss(env); toss(env);    toss(env); toss(env);
736  }  }
737    
738    extern void clear(environment *);
739    void forget_sym(symbol **);
740    
741  /* Quit stack. */  /* Quit stack. */
742  extern void quit(environment *env)  extern void quit(environment *env)
743  {  {
744      long i;
745    
746      clear(env);
747      if (env->err) return;
748      for(i= 0; i<HASHTBLSIZE; i++) {
749        while(env->symbols[i]!= NULL) {
750          forget_sym(&(env->symbols[i]));
751        }
752        env->symbols[i]= NULL;
753      }
754    exit(EXIT_SUCCESS);    exit(EXIT_SUCCESS);
755  }  }
756    
# Line 744  extern void words(environment *env) Line 776  extern void words(environment *env)
776    }    }
777  }  }
778    
779    /* Internal forget function */
780    void forget_sym(symbol **hash_entry) {
781      symbol *temp;
782    
783      temp= *hash_entry;
784      *hash_entry= (*hash_entry)->next;
785      
786      if(temp->val!=NULL) {
787        free_val(temp->val);
788      }
789      free(temp->id);
790      free(temp);
791    }
792    
793  /* Forgets a symbol (remove it from the hash table) */  /* Forgets a symbol (remove it from the hash table) */
794  extern void forget(environment *env)  extern void forget(environment *env)
795  {  {
796    char* sym_id;    char* sym_id;
797    stackitem *stack_head= env->head;    stackitem *stack_head= env->head;
   symbol **hash_entry, *temp;  
798    
799    if(stack_head==NULL) {    if(stack_head==NULL) {
800      printerr("Too Few Arguments");      printerr("Too Few Arguments");
# Line 766  extern void forget(environment *env) Line 811  extern void forget(environment *env)
811    sym_id= ((symbol*)(stack_head->item->content.ptr))->id;    sym_id= ((symbol*)(stack_head->item->content.ptr))->id;
812    toss(env);    toss(env);
813    
814    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);  
815  }  }
816    
817  /* Returns the current error number to the stack */  /* Returns the current error number to the stack */
# Line 791  int main() Line 828  int main()
828    init_env(&myenv);    init_env(&myenv);
829    
830    while(1) {    while(1) {
831      if(myenv.in_string==NULL)      if(myenv.in_string==NULL) {
832          nl();
833        printstack(&myenv);        printstack(&myenv);
834          printf("> ");
835        }
836      read(&myenv);      read(&myenv);
837      if(myenv.err) {      if(myenv.err) {
838        printf("(error %d) ", myenv.err);        printf("(error %d) ", myenv.err);
# Line 1176  extern void readline(environment *env) { Line 1216  extern void readline(environment *env) {
1216    
1217  /* Read a value and place on stack */  /* Read a value and place on stack */
1218  extern void read(environment *env) {  extern void read(environment *env) {
1219    const char symbform[]= "%[a-zA-Z0-9!$%*+./:<=>?@^_~-]%[\001-\377]";    const char symbform[]= "%[a-zA-Z0-9!$%*+./:<=>?@^_~-]%n";
1220    const char strform[]= "\"%[^\"]\"%[\001-\377]";    const char strform[]= "\"%[^\"]\"%n";
1221    const char intform[]= "%i%[\001-\377]";    const char intform[]= "%i%n";
1222    const char blankform[]= "%*[ \t]%[\001-\377]";    const char blankform[]= "%*[ \t]%n";
1223    const char ebrackform[]= "%*1[]]%[\001-\377]";    const char ebrackform[]= "%*1[]]%n";
1224    const char semicform[]= "%*1[;]%[\001-\377]";    const char semicform[]= "%*1[;]%n";
1225    const char bbrackform[]= "%*1[[]%[\001-\377]";    const char bbrackform[]= "%*1[[]%n";
1226    
1227    int itemp;    int itemp, readlength= -1;
1228    static int depth= 0;    static int depth= 0;
1229    char *rest, *match;    char *rest, *match;
1230    size_t inlength;    size_t inlength;
1231    
1232    if(env->in_string==NULL) {    if(env->in_string==NULL) {
1233        if(depth > 0) {
1234          printf("]> ");
1235        }
1236      readline(env); if(env->err) return;      readline(env); if(env->err) return;
1237            
1238      env->in_string= malloc(strlen(env->head->item->content.ptr)+1);      env->in_string= malloc(strlen(env->head->item->content.ptr)+1);
1239        env->free_string= env->in_string; /* Save the original pointer */
1240      strcpy(env->in_string, env->head->item->content.ptr);      strcpy(env->in_string, env->head->item->content.ptr);
1241      toss(env); if(env->err) return;      toss(env); if(env->err) return;
1242    }    }
# Line 1201  extern void read(environment *env) { Line 1245  extern void read(environment *env) {
1245    match= malloc(inlength);    match= malloc(inlength);
1246    rest= malloc(inlength);    rest= malloc(inlength);
1247    
1248    if(sscanf(env->in_string, blankform, rest)) {    if(sscanf(env->in_string, blankform, &readlength)!=EOF
1249         && readlength != -1) {
1250      ;      ;
1251    } else if(sscanf(env->in_string, intform, &itemp, rest) > 0) {    } else if(sscanf(env->in_string, intform, &itemp, &readlength) != EOF
1252                && readlength != -1) {
1253      push_int(env, itemp);      push_int(env, itemp);
1254    } else if(sscanf(env->in_string, strform, match, rest) > 0) {    } else if(sscanf(env->in_string, strform, match, &readlength) != EOF
1255                && readlength != -1) {
1256      push_cstring(env, match);      push_cstring(env, match);
1257    } else if(sscanf(env->in_string, symbform, match, rest) > 0) {    } else if(sscanf(env->in_string, symbform, match, &readlength) != EOF
1258                && readlength != -1) {
1259      push_sym(env, match);      push_sym(env, match);
1260    } else if(sscanf(env->in_string, ebrackform, rest) > 0) {    } else if(sscanf(env->in_string, ebrackform, &readlength) != EOF
1261                && readlength != -1) {
1262      pack(env); if(env->err) return;      pack(env); if(env->err) return;
1263      if(depth!=0) depth--;      if(depth != 0) depth--;
1264    } else if(sscanf(env->in_string, semicform, rest) > 0) {    } else if(sscanf(env->in_string, semicform, &readlength) != EOF
1265                && readlength != -1) {
1266      push_sym(env, ";");      push_sym(env, ";");
1267    } else if(sscanf(env->in_string, bbrackform, rest) > 0) {    } else if(sscanf(env->in_string, bbrackform, &readlength) != EOF
1268                && readlength != -1) {
1269      push_sym(env, "[");      push_sym(env, "[");
1270      depth++;      depth++;
1271    } else {    } else {
1272      free(rest);      free(env->free_string);
1273      rest= NULL;      env->in_string = env->free_string = NULL;
1274        free(match);
1275      }
1276      if ( env->in_string != NULL) {
1277        env->in_string += readlength;
1278    }    }
         
   free(env->in_string);  
   free(match);  
   
   env->in_string= rest;  
1279    
1280    if(depth)    if(depth)
1281      return read(env);      return read(env);
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