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revision 1.114 by teddy, Sun Mar 17 02:15:01 2002 UTC revision 1.118 by teddy, Wed Mar 20 13:20:29 2002 UTC
# Line 1  Line 1 
1    /* -*- coding: utf-8; -*- */
2  /*  /*
3      stack - an interactive interpreter for a stack-based language      stack - an interactive interpreter for a stack-based language
4      Copyright (C) 2002  Mats Alritzson and Teddy Hogeborn      Copyright (C) 2002  Mats Alritzson and Teddy Hogeborn
# Line 20  Line 21 
21               Teddy Hogeborn <teddy@fukt.bth.se>               Teddy Hogeborn <teddy@fukt.bth.se>
22  */  */
23    
24  #define CAR(X) (X->content.c->car)  #define CAR(X) ((X)->content.c->car)
25  #define CDR(X) (X->content.c->cdr)  #define CDR(X) ((X)->content.c->cdr)
26    
27  /* printf, sscanf, fgets, fprintf, fopen, perror */  /* printf, sscanf, fgets, fprintf, fopen, perror */
28  #include <stdio.h>  #include <stdio.h>
# Line 61  void init_env(environment *env) Line 62  void init_env(environment *env)
62    env->gc_ref= NULL;    env->gc_ref= NULL;
63    
64    env->head= new_val(env);    env->head= new_val(env);
   env->head->type= empty;  
65    for(i= 0; i<HASHTBLSIZE; i++)    for(i= 0; i<HASHTBLSIZE; i++)
66      env->symbols[i]= NULL;      env->symbols[i]= NULL;
67    env->err= 0;    env->err= 0;
# Line 123  value* new_val(environment *env) Line 123  value* new_val(environment *env)
123    value *nval= malloc(sizeof(value));    value *nval= malloc(sizeof(value));
124    stackitem *nitem= malloc(sizeof(stackitem));    stackitem *nitem= malloc(sizeof(stackitem));
125    
126      assert(nval != NULL);
127      assert(nitem != NULL);
128    
129    nval->content.ptr= NULL;    nval->content.ptr= NULL;
130    nval->type= integer;    nval->type= empty;
131    
132    nitem->item= nval;    nitem->item= nval;
133    nitem->next= env->gc_ref;    nitem->next= env->gc_ref;
# Line 165  inline void gc_maybe(environment *env) Line 168  inline void gc_maybe(environment *env)
168  extern void gc_init(environment *env)  extern void gc_init(environment *env)
169  {  {
170    stackitem *new_head= NULL, *titem;    stackitem *new_head= NULL, *titem;
   cons *iterator;  
171    symbol *tsymb;    symbol *tsymb;
172    int i;    int i;
173    
# Line 195  extern void gc_init(environment *env) Line 197  extern void gc_init(environment *env)
197    
198      if(!(env->gc_ref->item->gc.no_gc)){ /* neither mark nor protect */      if(!(env->gc_ref->item->gc.no_gc)){ /* neither mark nor protect */
199    
200        if(env->gc_ref->item->type==string) /* Remove content */        /* Remove content */
201          switch(env->gc_ref->item->type){
202          case string:
203          free(env->gc_ref->item->content.ptr);          free(env->gc_ref->item->content.ptr);
204            break;
205          case tcons:
206            free(env->gc_ref->item->content.c);
207            break;
208          case empty:
209          case integer:
210          case tfloat:
211          case func:
212          case symb:
213            /* Symbol strings are freed when walking the hash table */
214          }
215    
216        free(env->gc_ref->item);  /* Remove from gc_ref */        free(env->gc_ref->item);  /* Remove from gc_ref */
217        titem= env->gc_ref->next;        titem= env->gc_ref->next;
# Line 285  void push_val(environment *env, value *v Line 300  void push_val(environment *env, value *v
300  {  {
301    value *new_value= new_val(env);    value *new_value= new_val(env);
302    
303    new_value->content.c= malloc(sizeof(cons));    new_value->content.c= malloc(sizeof(pair));
304    assert(new_value->content.c!=NULL);    assert(new_value->content.c!=NULL);
305      env->gc_count += sizeof(pair);
306    new_value->type= tcons;    new_value->type= tcons;
307    CAR(new_value)= val;    CAR(new_value)= val;
308    CDR(new_value)= env->head;    CDR(new_value)= env->head;
# Line 322  void push_cstring(environment *env, cons Line 338  void push_cstring(environment *env, cons
338    int length= strlen(in_string)+1;    int length= strlen(in_string)+1;
339    
340    new_value->content.ptr= malloc(length);    new_value->content.ptr= malloc(length);
341      assert(new_value != NULL);
342    env->gc_count += length;    env->gc_count += length;
343    strcpy(new_value->content.ptr, in_string);    strcpy(new_value->content.ptr, in_string);
344    new_value->type= string;    new_value->type= string;
# Line 336  char *mangle_str(const char *old_string) Line 353  char *mangle_str(const char *old_string)
353    char *new_string, *current;    char *new_string, *current;
354    
355    new_string= malloc((strlen(old_string)*2)+4);    new_string= malloc((strlen(old_string)*2)+4);
356      assert(new_string != NULL);
357    strcpy(new_string, "sx_");    /* Stack eXternal */    strcpy(new_string, "sx_");    /* Stack eXternal */
358    current= new_string+3;    current= new_string+3;
359    while(old_string[0] != '\0'){    while(old_string[0] != '\0'){
# Line 405  void push_sym(environment *env, const ch Line 423  void push_sym(environment *env, const ch
423    
424      /* Create a new symbol */      /* Create a new symbol */
425      (*new_symbol)= malloc(sizeof(symbol));      (*new_symbol)= malloc(sizeof(symbol));
426        assert((*new_symbol) != NULL);
427      (*new_symbol)->val= NULL;   /* undefined value */      (*new_symbol)->val= NULL;   /* undefined value */
428      (*new_symbol)->next= NULL;      (*new_symbol)->next= NULL;
429      (*new_symbol)->id= malloc(strlen(in_string)+1);      (*new_symbol)->id= malloc(strlen(in_string)+1);
430        assert((*new_symbol)->id != NULL);
431      strcpy((*new_symbol)->id, in_string);      strcpy((*new_symbol)->id, in_string);
432    
433      /* Intern the new symbol in the hash table */      /* Intern the new symbol in the hash table */
# Line 485  extern void type(environment *env) Line 505  extern void type(environment *env)
505  }      }    
506    
507  /* Print a value */  /* Print a value */
508  void print_val(value *val, int noquote)  void print_val(value *val, int noquote, stackitem *stack)
509  {  {
510      stackitem *titem, *tstack;
511      int depth;
512    
513    switch(val->type) {    switch(val->type) {
514    case empty:    case empty:
515      printf("[]");      printf("[]");
# Line 511  void print_val(value *val, int noquote) Line 534  void print_val(value *val, int noquote)
534      break;      break;
535    case tcons:    case tcons:
536      printf("[ ");      printf("[ ");
537        tstack= stack;
538      do {      do {
539        print_val(CAR(val), noquote);        titem=malloc(sizeof(stackitem));
540          assert(titem != NULL);
541          titem->item=val;
542          titem->next=tstack;
543          tstack=titem;             /* Put it on the stack */
544          /* Search a stack of values being printed to see if we are already
545             printing this value */
546          titem=tstack;
547          depth=0;
548          while(titem != NULL && titem->item != CAR(val)){
549            titem=titem->next;
550            depth++;
551          }
552          if(titem != NULL){        /* If we found it on the stack, */
553            printf("#%d#", depth);  /* print a depth reference */
554          } else {
555            print_val(CAR(val), noquote, tstack);
556          }
557        val= CDR(val);        val= CDR(val);
558        switch(val->type){        switch(val->type){
559        case empty:        case empty:
560          break;          break;
561        case tcons:        case tcons:
562          printf(" ");          /* Search a stack of values being printed to see if we are already
563               printing this value */
564            titem=tstack;
565            depth=0;
566            while(titem != NULL && titem->item != val){
567              titem=titem->next;
568              depth++;
569            }
570            if(titem != NULL){      /* If we found it on the stack, */
571              printf(" . #%d#", depth); /* print a depth reference */
572            } else {
573              printf(" ");
574            }
575          break;          break;
576        default:        default:
577          printf(" . ");          /* Improper list */          printf(" . ");          /* Improper list */
578          print_val(val, noquote);          print_val(val, noquote, tstack);
579        }        }
580      } while(val->type == tcons);      } while(val->type == tcons && titem == NULL);
581        titem=tstack;
582        while(titem != stack){
583          tstack=titem->next;
584          free(titem);
585          titem=tstack;
586        }
587      printf(" ]");      printf(" ]");
588      break;      break;
589    }    }
# Line 537  extern void print_(environment *env) Line 596  extern void print_(environment *env)
596      env->err= 1;      env->err= 1;
597      return;      return;
598    }    }
599    print_val(CAR(env->head), 0);    print_val(CAR(env->head), 0, NULL);
600    nl();    nl();
601  }  }
602    
# Line 556  extern void princ_(environment *env) Line 615  extern void princ_(environment *env)
615      env->err= 1;      env->err= 1;
616      return;      return;
617    }    }
618    print_val(CAR(env->head), 1);    print_val(CAR(env->head), 1, NULL);
619  }  }
620    
621  /* Prints the top element of the stack and then discards it. */  /* Prints the top element of the stack and then discards it. */
# Line 573  void print_st(value *stack_head, long co Line 632  void print_st(value *stack_head, long co
632    if(CDR(stack_head)->type != empty)    if(CDR(stack_head)->type != empty)
633      print_st(CDR(stack_head), counter+1);      print_st(CDR(stack_head), counter+1);
634    printf("%ld: ", counter);    printf("%ld: ", counter);
635    print_val(CAR(stack_head), 0);    print_val(CAR(stack_head), 0, NULL);
636    nl();    nl();
637  }  }
638    
# Line 720  extern void eval(environment *env) Line 779  extern void eval(environment *env)
779      unprotect(temp_val);      unprotect(temp_val);
780      return;      return;
781    
782    default:    case empty:
783      case integer:
784      case tfloat:
785      case string:
786      return;      return;
787    }    }
788  }  }
# Line 747  extern void rev(environment *env) Line 809  extern void rev(environment *env)
809    
810    old_head= CAR(env->head);    old_head= CAR(env->head);
811    new_head= new_val(env);    new_head= new_val(env);
   new_head->type= empty;  
812    while(old_head->type != empty) {    while(old_head->type != empty) {
813      item= old_head;      item= old_head;
814      old_head= CDR(old_head);      old_head= CDR(old_head);
# Line 763  extern void pack(environment *env) Line 824  extern void pack(environment *env)
824    value *iterator, *temp, *ending;    value *iterator, *temp, *ending;
825    
826    ending=new_val(env);    ending=new_val(env);
   ending->type=empty;  
827    
828    iterator= env->head;    iterator= env->head;
829    if(iterator->type == empty    if(iterator->type == empty
# Line 1109  extern void sx_2b(environment *env) Line 1169  extern void sx_2b(environment *env)
1169      toss(env); if(env->err) return;      toss(env); if(env->err) return;
1170      len= strlen(a_val->content.ptr)+strlen(b_val->content.ptr)+1;      len= strlen(a_val->content.ptr)+strlen(b_val->content.ptr)+1;
1171      new_string= malloc(len);      new_string= malloc(len);
1172        assert(new_string != NULL);
1173      strcpy(new_string, b_val->content.ptr);      strcpy(new_string, b_val->content.ptr);
1174      strcat(new_string, a_val->content.ptr);      strcat(new_string, a_val->content.ptr);
1175      push_cstring(env, new_string);      push_cstring(env, new_string);
# Line 1324  value *copy_val(environment *env, value Line 1385  value *copy_val(environment *env, value
1385    case integer:    case integer:
1386    case func:    case func:
1387    case symb:    case symb:
1388      case empty:
1389      new_value->content= old_value->content;      new_value->content= old_value->content;
1390      break;      break;
1391    case string:    case string:
# Line 1332  value *copy_val(environment *env, value Line 1394  value *copy_val(environment *env, value
1394      break;      break;
1395    case tcons:    case tcons:
1396    
1397      new_value->content.c= malloc(sizeof(cons));      new_value->content.c= malloc(sizeof(pair));
1398      assert(new_value->content.c!=NULL);      assert(new_value->content.c!=NULL);
1399        env->gc_count += sizeof(pair);
1400    
1401      CAR(new_value)= copy_val(env, CAR(old_value)); /* recurse */      CAR(new_value)= copy_val(env, CAR(old_value)); /* recurse */
1402      CDR(new_value)= copy_val(env, CDR(old_value)); /* recurse */      CDR(new_value)= copy_val(env, CDR(old_value)); /* recurse */
# Line 1691  extern void sx_72656164(environment *env Line 1754  extern void sx_72656164(environment *env
1754    int count= -1;    int count= -1;
1755    float ftemp;    float ftemp;
1756    static int depth= 0;    static int depth= 0;
1757    char *match, *ctemp;    char *match;
1758    size_t inlength;    size_t inlength;
1759    
1760    if(env->in_string==NULL) {    if(env->in_string==NULL) {
# Line 1706  extern void sx_72656164(environment *env Line 1769  extern void sx_72656164(environment *env
1769      }      }
1770            
1771      env->in_string= malloc(strlen(CAR(env->head)->content.ptr)+1);      env->in_string= malloc(strlen(CAR(env->head)->content.ptr)+1);
1772        assert(env->in_string != NULL);
1773      env->free_string= env->in_string; /* Save the original pointer */      env->free_string= env->in_string; /* Save the original pointer */
1774      strcpy(env->in_string, CAR(env->head)->content.ptr);      strcpy(env->in_string, CAR(env->head)->content.ptr);
1775      toss(env); if(env->err) return;      toss(env); if(env->err) return;
# Line 1713  extern void sx_72656164(environment *env Line 1777  extern void sx_72656164(environment *env
1777        
1778    inlength= strlen(env->in_string)+1;    inlength= strlen(env->in_string)+1;
1779    match= malloc(inlength);    match= malloc(inlength);
1780      assert(match != NULL);
1781    
1782    if(sscanf(env->in_string, blankform, &readlength) != EOF    if(sscanf(env->in_string, blankform, &readlength) != EOF
1783       && readlength != -1) {       && readlength != -1) {
# Line 2353  extern void cdr(environment *env) Line 2418  extern void cdr(environment *env)
2418    
2419    CAR(env->head)=CDR(CAR(env->head));    CAR(env->head)=CDR(CAR(env->head));
2420  }  }
2421    
2422    extern void cons(environment *env)
2423    {
2424      value *val;
2425    
2426      if(env->head->type==empty || CDR(env->head)->type==empty) {
2427        printerr("Too Few Arguments");
2428        env->err= 1;
2429        return;
2430      }
2431    
2432      val=new_val(env);
2433      val->content.c= malloc(sizeof(pair));
2434      assert(val->content.c!=NULL);
2435    
2436      env->gc_count += sizeof(pair);
2437      val->type=tcons;
2438    
2439      CAR(val)= CAR(CDR(env->head));
2440      CDR(val)= CAR(env->head);
2441    
2442      push_val(env, val);
2443    
2444      swap(env); if(env->err) return;
2445      toss(env); if(env->err) return;
2446      swap(env); if(env->err) return;
2447      toss(env); if(env->err) return;
2448    }
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