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/* printf */ |
/* -*- coding: utf-8; -*- */ |
2 |
#include <stdio.h> |
/* |
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/* EXIT_SUCCESS */ |
stack - an interactive interpreter for a stack-based language |
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#include <stdlib.h> |
Copyright (C) 2002 Mats Alritzson and Teddy Hogeborn |
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/* NULL */ |
|
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#include <stddef.h> |
This program is free software; you can redistribute it and/or modify |
7 |
/* dlopen, dlsym, dlerror */ |
it under the terms of the GNU General Public License as published by |
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#include <dlfcn.h> |
the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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#define HASHTBLSIZE 65536 |
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This program is distributed in the hope that it will be useful, |
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typedef struct stack_item |
but WITHOUT ANY WARRANTY; without even the implied warranty of |
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{ |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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enum { |
GNU General Public License for more details. |
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value, /* Integer */ |
|
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string, |
You should have received a copy of the GNU General Public License |
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ref, /* Reference (to an element in the hash table) */ |
along with this program; if not, write to the Free Software |
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func, /* Function pointer */ |
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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symbol, |
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list |
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} type; /* Tells what kind of stack element */ |
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union { |
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void* ptr; /* Pointer to the content */ |
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int val; /* ...or an integer */ |
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} content; /* Stores a pointer or an integer */ |
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char* id; /* Symbol name */ |
Authors: Mats Alritzson <masse@fukt.bth.se> |
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struct stack_item* next; /* Next element */ |
Teddy Hogeborn <teddy@fukt.bth.se> |
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} stackitem; |
*/ |
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#include "stack.h" |
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typedef stackitem* hashtbl[HASHTBLSIZE]; /* Hash table declaration */ |
const char* start_message= "Stack version $Revision$\n\ |
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typedef void (*funcp)(stackitem**); /* Function pointer declaration */ |
Copyright (C) 2002 Mats Alritzson and Teddy Hogeborn\n\ |
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Stack comes with ABSOLUTELY NO WARRANTY; for details type 'warranty;'.\n\ |
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This is free software, and you are welcome to redistribute it\n\ |
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under certain conditions; type 'copying;' for details.\n"; |
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/* Initiates a newly created hash table. */ |
/* Initialize a newly created environment */ |
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void init_hashtbl(hashtbl out_hash) |
void init_env(environment *env) |
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{ |
{ |
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long i; |
int i; |
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env->gc_limit= 400000; |
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env->gc_count= 0; |
40 |
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env->gc_ref= NULL; |
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env->head= new_val(env); |
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for(i= 0; i<HASHTBLSIZE; i++) |
for(i= 0; i<HASHTBLSIZE; i++) |
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out_hash[i]= NULL; |
env->symbols[i]= NULL; |
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env->err= 0; |
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env->in_string= NULL; |
47 |
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env->free_string= NULL; |
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env->inputstream= stdin; |
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env->interactive= 1; |
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} |
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void printerr(environment *env) |
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{ |
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char *in_string; |
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switch(env->err) { |
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case 0: |
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return; |
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case 1: |
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in_string= "Too Few Arguments"; |
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break; |
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case 2: |
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in_string= "Bad Argument Type"; |
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break; |
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case 3: |
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in_string= "Unbound Variable"; |
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break; |
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default: |
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in_string= "Unknown error"; |
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break; |
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} |
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fprintf(stderr, "\"%s\":\nErr: %s\n", env->errsymb, in_string); |
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} |
} |
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/* Returns a pointer to an element in the hash table. */ |
|
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stackitem** hash(hashtbl in_hashtbl, const char* in_string) |
/* Returns a pointer to a pointer to an element in the hash table. */ |
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symbol **hash(hashtbl in_hashtbl, const char *in_string) |
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{ |
{ |
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long i= 0; |
int i= 0; |
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unsigned long out_hash= 0; |
unsigned int out_hash= 0; |
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char key= 0; |
char key= '\0'; |
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stackitem** position; |
symbol **position; |
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while(1){ /* Hash in_string */ |
while(1){ /* Hash in_string */ |
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key= in_string[i++]; |
key= in_string[i++]; |
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out_hash= out_hash%HASHTBLSIZE; |
out_hash= out_hash%HASHTBLSIZE; |
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position= &(in_hashtbl[out_hash]); |
position= &(in_hashtbl[out_hash]); |
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while(1){ /* Return position if empty */ |
while(1){ |
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if(*position==NULL) |
if(*position==NULL) /* If empty */ |
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return position; |
return position; |
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if(strcmp(in_string, (*position)->id)==0) /* Return position if match */ |
if(strcmp(in_string, (*position)->id)==0) /* If match */ |
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return position; |
return position; |
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position= &((*position)->next); /* Try next */ |
position= &((*position)->next); /* Try next */ |
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} |
} |
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} |
} |
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/* Generic push function. */ |
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int push(stackitem** stack_head, stackitem* in_item) |
/* Create new value */ |
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value* new_val(environment *env) |
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{ |
{ |
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in_item->next= *stack_head; |
value *nval= malloc(sizeof(value)); |
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*stack_head= in_item; |
stackitem *nitem= malloc(sizeof(stackitem)); |
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return 1; |
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assert(nval != NULL); |
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assert(nitem != NULL); |
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nval->content.ptr= NULL; |
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nval->type= empty; |
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nitem->item= nval; |
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nitem->next= env->gc_ref; |
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env->gc_ref= nitem; |
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env->gc_count += sizeof(value); |
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nval->gc.flag.mark= 0; |
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nval->gc.flag.protect= 0; |
128 |
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return nval; |
130 |
} |
} |
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/* Push a value on the stack. */ |
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int push_val(stackitem** stack_head, int in_val) |
/* Mark values recursively. |
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Marked values are not collected by the GC. */ |
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inline void gc_mark(value *val) |
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{ |
{ |
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stackitem* new_item= malloc(sizeof(stackitem)); |
if(val==NULL || val->gc.flag.mark) |
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new_item->content.val= in_val; |
return; |
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new_item->type= value; |
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val->gc.flag.mark= 1; |
141 |
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push(stack_head, new_item); |
if(val->type==tcons) { |
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return 1; |
gc_mark(CAR(val)); |
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gc_mark(CDR(val)); |
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} |
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} |
} |
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148 |
/* Copy a string onto the stack. */ |
|
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int push_cstring(stackitem** stack_head, const char* in_string) |
/* Start GC */ |
150 |
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extern void gc_init(environment *env) |
151 |
{ |
{ |
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stackitem* new_item= malloc(sizeof(stackitem)); |
stackitem *new_head= NULL, *titem; |
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new_item->content.ptr= malloc(strlen(in_string)+1); |
symbol *tsymb; |
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strcpy(new_item->content.ptr, in_string); |
int i; |
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new_item->type= string; |
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if(env->interactive) |
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printf("Garbage collecting."); |
158 |
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/* Mark values on stack */ |
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gc_mark(env->head); |
161 |
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162 |
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if(env->interactive) |
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printf("."); |
164 |
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/* Mark values in hashtable */ |
166 |
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for(i= 0; i<HASHTBLSIZE; i++) |
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for(tsymb= env->symbols[i]; tsymb!=NULL; tsymb= tsymb->next) |
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if (tsymb->val != NULL) |
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gc_mark(tsymb->val); |
170 |
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if(env->interactive) |
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printf("."); |
173 |
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env->gc_count= 0; |
175 |
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while(env->gc_ref!=NULL) { /* Sweep unused values */ |
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if(!(env->gc_ref->item->gc.no_gc)){ /* neither mark nor protect */ |
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/* Remove content */ |
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switch(env->gc_ref->item->type){ |
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case string: |
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free(env->gc_ref->item->content.string); |
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break; |
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case tcons: |
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free(env->gc_ref->item->content.c); |
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break; |
187 |
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case port: |
188 |
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case empty: |
189 |
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case unknown: |
190 |
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case integer: |
191 |
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case tfloat: |
192 |
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case func: |
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case symb: |
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/* Symbol strings are freed when walking the hash table */ |
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break; |
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} |
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free(env->gc_ref->item); /* Remove from gc_ref */ |
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titem= env->gc_ref->next; |
200 |
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free(env->gc_ref); /* Remove value */ |
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env->gc_ref= titem; |
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continue; |
203 |
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} |
204 |
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#ifdef DEBUG |
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printf("Kept value (%p)", env->gc_ref->item); |
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if(env->gc_ref->item->gc.flag.mark) |
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printf(" (marked)"); |
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if(env->gc_ref->item->gc.flag.protect) |
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printf(" (protected)"); |
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switch(env->gc_ref->item->type){ |
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case integer: |
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printf(" integer: %d", env->gc_ref->item->content.i); |
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break; |
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case func: |
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printf(" func: %p", env->gc_ref->item->content.func); |
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break; |
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case symb: |
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printf(" symb: %s", env->gc_ref->item->content.sym->id); |
220 |
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break; |
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case tcons: |
222 |
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printf(" tcons: %p\t%p", CAR(env->gc_ref->item), |
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CDR(env->gc_ref->item)); |
224 |
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break; |
225 |
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default: |
226 |
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printf(" <unknown %d>", (env->gc_ref->item->type)); |
227 |
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} |
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printf("\n"); |
229 |
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#endif /* DEBUG */ |
230 |
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/* Keep values */ |
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env->gc_count += sizeof(value); |
233 |
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if(env->gc_ref->item->type==string) |
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env->gc_count += strlen(env->gc_ref->item->content.string)+1; |
235 |
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titem= env->gc_ref->next; |
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env->gc_ref->next= new_head; |
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new_head= env->gc_ref; |
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new_head->item->gc.flag.mark= 0; |
240 |
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env->gc_ref= titem; |
241 |
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} |
242 |
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243 |
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if (env->gc_limit < env->gc_count*2) |
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env->gc_limit= env->gc_count*2; |
245 |
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246 |
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env->gc_ref= new_head; |
247 |
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248 |
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if(env->interactive) |
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printf("done (%d bytes still allocated)\n", env->gc_count); |
250 |
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push(stack_head, new_item); |
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return 1; |
|
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} |
} |
252 |
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253 |
/* Create a new hash entry. */ |
|
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int mk_hashentry(hashtbl in_hashtbl, stackitem* in_item, const char* id) |
inline void gc_maybe(environment *env) |
255 |
{ |
{ |
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in_item->id= malloc(strlen(id)+1); |
if(env->gc_count < env->gc_limit) |
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return; |
258 |
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else |
259 |
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return gc_init(env); |
260 |
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} |
261 |
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strcpy(in_item->id, id); |
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push(hash(in_hashtbl, id), in_item); |
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262 |
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263 |
return 1; |
/* Protect values from GC */ |
264 |
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void protect(value *val) |
265 |
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{ |
266 |
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if(val==NULL || val->gc.flag.protect) |
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return; |
268 |
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val->gc.flag.protect= 1; |
270 |
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271 |
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if(val->type==tcons) { |
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protect(CAR(val)); |
273 |
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protect(CDR(val)); |
274 |
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} |
275 |
} |
} |
276 |
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277 |
/* Define a function a new function in the hash table. */ |
|
278 |
void def_func(hashtbl in_hashtbl, funcp in_func, const char* id) |
/* Unprotect values from GC */ |
279 |
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void unprotect(value *val) |
280 |
{ |
{ |
281 |
stackitem* temp= malloc(sizeof(stackitem)); |
if(val==NULL || !(val->gc.flag.protect)) |
282 |
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return; |
283 |
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284 |
temp->type= func; |
val->gc.flag.protect= 0; |
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temp->content.ptr= in_func; |
|
285 |
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|
286 |
mk_hashentry(in_hashtbl, temp, id); |
if(val->type==tcons) { |
287 |
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unprotect(CAR(val)); |
288 |
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unprotect(CDR(val)); |
289 |
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} |
290 |
} |
} |
291 |
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|
292 |
/* Define a new symbol in the hash table. */ |
|
293 |
void def_sym(hashtbl in_hashtbl, const char* id) |
/* Push a value onto the stack */ |
294 |
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void push_val(environment *env, value *val) |
295 |
{ |
{ |
296 |
stackitem* temp= malloc(sizeof(stackitem)); |
value *new_value= new_val(env); |
297 |
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|
298 |
|
new_value->content.c= malloc(sizeof(pair)); |
299 |
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assert(new_value->content.c!=NULL); |
300 |
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env->gc_count += sizeof(pair); |
301 |
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new_value->type= tcons; |
302 |
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CAR(new_value)= val; |
303 |
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CDR(new_value)= env->head; |
304 |
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env->head= new_value; |
305 |
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} |
306 |
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307 |
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308 |
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/* Push an integer onto the stack */ |
309 |
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void push_int(environment *env, int in_val) |
310 |
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{ |
311 |
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value *new_value= new_val(env); |
312 |
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|
313 |
temp->type= symbol; |
new_value->content.i= in_val; |
314 |
mk_hashentry(in_hashtbl, temp, id); |
new_value->type= integer; |
315 |
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|
316 |
|
push_val(env, new_value); |
317 |
} |
} |
318 |
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|
319 |
/* Push a reference to an entry in the hash table onto the stack. */ |
|
320 |
int push_ref(stackitem** stack_head, hashtbl in_hash, const char* in_string) |
/* Push a floating point number onto the stack */ |
321 |
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void push_float(environment *env, float in_val) |
322 |
{ |
{ |
323 |
static void* handle= NULL; |
value *new_value= new_val(env); |
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void* symbol; |
|
324 |
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|
325 |
stackitem* new_item= malloc(sizeof(stackitem)); |
new_value->content.f= in_val; |
326 |
new_item->content.ptr= *hash(in_hash, in_string); |
new_value->type= tfloat; |
|
new_item->type= ref; |
|
327 |
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|
328 |
if(new_item->content.ptr==NULL) { /* If hash entry empty */ |
push_val(env, new_value); |
329 |
if(handle==NULL) /* If no handle */ |
} |
|
handle= dlopen(NULL, RTLD_LAZY); |
|
330 |
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symbol= dlsym(handle, in_string); /* Get function pointer */ |
|
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if(dlerror()==NULL) /* If existing function pointer */ |
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def_func(in_hash, symbol, in_string); /* Store function pointer */ |
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else |
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def_sym(in_hash, in_string); /* Make symbol */ |
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new_item->content.ptr= *hash(in_hash, in_string); /* XXX */ |
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new_item->type= ref; |
|
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} |
|
331 |
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|
332 |
push(stack_head, new_item); |
/* Copy a string onto the stack. */ |
333 |
return 1; |
void push_cstring(environment *env, const char *in_string) |
334 |
|
{ |
335 |
|
value *new_value= new_val(env); |
336 |
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int length= strlen(in_string)+1; |
337 |
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|
338 |
|
new_value->content.string= malloc(length); |
339 |
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assert(new_value != NULL); |
340 |
|
env->gc_count += length; |
341 |
|
strcpy(new_value->content.string, in_string); |
342 |
|
new_value->type= string; |
343 |
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|
344 |
|
push_val(env, new_value); |
345 |
} |
} |
346 |
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|
347 |
/* Discard the top element of the stack. */ |
|
348 |
extern void toss(stackitem** stack_head) |
/* Mangle a symbol name to a valid C identifier name */ |
349 |
|
char *mangle_str(const char *old_string) |
350 |
{ |
{ |
351 |
stackitem* temp= *stack_head; |
char validchars[]= "0123456789abcdef"; |
352 |
|
char *new_string, *current; |
353 |
|
|
354 |
if((*stack_head)==NULL) |
new_string= malloc((strlen(old_string)*2)+4); |
355 |
return; |
assert(new_string != NULL); |
356 |
|
strcpy(new_string, "sx_"); /* Stack eXternal */ |
357 |
if((*stack_head)->type==string) |
current= new_string+3; |
|
free((*stack_head)->content.ptr); |
|
358 |
|
|
359 |
*stack_head= (*stack_head)->next; |
while(old_string[0] != '\0'){ |
360 |
free(temp); |
current[0]= validchars[(unsigned char)(old_string[0])/16]; |
361 |
|
current[1]= validchars[(unsigned char)(old_string[0])%16]; |
362 |
|
current+= 2; |
363 |
|
old_string++; |
364 |
|
} |
365 |
|
current[0]= '\0'; |
366 |
|
|
367 |
|
return new_string; /* The caller must free() it */ |
368 |
} |
} |
369 |
|
|
370 |
/* Print newline. */ |
|
371 |
extern void nl() |
/* Push a symbol onto the stack. */ |
372 |
|
void push_sym(environment *env, const char *in_string) |
373 |
{ |
{ |
374 |
printf("\n"); |
value *new_value; /* A new symbol value */ |
375 |
|
/* ...which might point to... */ |
376 |
|
symbol **new_symbol; /* (if needed) A new actual symbol */ |
377 |
|
/* ...which, if possible, will be bound to... */ |
378 |
|
value *new_fvalue; /* (if needed) A new function value */ |
379 |
|
/* ...which will point to... */ |
380 |
|
void *funcptr; /* A function pointer */ |
381 |
|
|
382 |
|
static void *handle= NULL; /* Dynamic linker handle */ |
383 |
|
const char *dlerr; /* Dynamic linker error */ |
384 |
|
char *mangled; /* Mangled function name */ |
385 |
|
|
386 |
|
new_value= new_val(env); |
387 |
|
new_fvalue= new_val(env); |
388 |
|
|
389 |
|
/* The new value is a symbol */ |
390 |
|
new_value->type= symb; |
391 |
|
|
392 |
|
/* Look up the symbol name in the hash table */ |
393 |
|
new_symbol= hash(env->symbols, in_string); |
394 |
|
new_value->content.sym= *new_symbol; |
395 |
|
|
396 |
|
if(*new_symbol==NULL) { /* If symbol was undefined */ |
397 |
|
|
398 |
|
/* Create a new symbol */ |
399 |
|
(*new_symbol)= malloc(sizeof(symbol)); |
400 |
|
assert((*new_symbol) != NULL); |
401 |
|
(*new_symbol)->val= NULL; /* undefined value */ |
402 |
|
(*new_symbol)->next= NULL; |
403 |
|
(*new_symbol)->id= malloc(strlen(in_string)+1); |
404 |
|
assert((*new_symbol)->id != NULL); |
405 |
|
strcpy((*new_symbol)->id, in_string); |
406 |
|
|
407 |
|
/* Intern the new symbol in the hash table */ |
408 |
|
new_value->content.sym= *new_symbol; |
409 |
|
|
410 |
|
/* Try to load the symbol name as an external function, to see if |
411 |
|
we should bind the symbol to a new function pointer value */ |
412 |
|
if(handle==NULL) /* If no handle */ |
413 |
|
handle= dlopen(NULL, RTLD_LAZY); |
414 |
|
|
415 |
|
mangled= mangle_str(in_string); /* mangle the name */ |
416 |
|
funcptr= dlsym(handle, mangled); /* and try to find it */ |
417 |
|
|
418 |
|
dlerr= dlerror(); |
419 |
|
if(dlerr != NULL) { /* If no function was found */ |
420 |
|
funcptr= dlsym(handle, in_string); /* Get function pointer */ |
421 |
|
dlerr= dlerror(); |
422 |
|
} |
423 |
|
|
424 |
|
if(dlerr==NULL) { /* If a function was found */ |
425 |
|
new_fvalue->type= func; /* The new value is a function pointer */ |
426 |
|
new_fvalue->content.func= funcptr; /* Store function pointer */ |
427 |
|
(*new_symbol)->val= new_fvalue; /* Bind the symbol to the new |
428 |
|
function value */ |
429 |
|
} |
430 |
|
|
431 |
|
free(mangled); |
432 |
|
} |
433 |
|
|
434 |
|
push_val(env, new_value); |
435 |
} |
} |
436 |
|
|
437 |
/* Prints the top element of the stack. */ |
|
438 |
void print_(stackitem** stack_head) |
/* Print a value */ |
439 |
|
void print_val(environment *env, value *val, int noquote, stackitem *stack, |
440 |
|
FILE *stream) |
441 |
{ |
{ |
442 |
if((*stack_head)==NULL) |
stackitem *titem, *tstack; |
443 |
return; |
int depth; |
444 |
|
|
445 |
switch((*stack_head)->type) { |
switch(val->type) { |
446 |
case value: |
case empty: |
447 |
printf("%d", (*stack_head)->content.val); |
if(fprintf(stream, "[]") < 0){ |
448 |
|
perror("print_val"); |
449 |
|
env->err= 5; |
450 |
|
return; |
451 |
|
} |
452 |
|
break; |
453 |
|
case unknown: |
454 |
|
if(fprintf(stream, "UNKNOWN") < 0){ |
455 |
|
perror("print_val"); |
456 |
|
env->err= 5; |
457 |
|
return; |
458 |
|
} |
459 |
|
break; |
460 |
|
case integer: |
461 |
|
if(fprintf(stream, "%d", val->content.i) < 0){ |
462 |
|
perror("print_val"); |
463 |
|
env->err= 5; |
464 |
|
return; |
465 |
|
} |
466 |
|
break; |
467 |
|
case tfloat: |
468 |
|
if(fprintf(stream, "%f", val->content.f) < 0){ |
469 |
|
perror("print_val"); |
470 |
|
env->err= 5; |
471 |
|
return; |
472 |
|
} |
473 |
break; |
break; |
474 |
case string: |
case string: |
475 |
printf("%s", (char*)(*stack_head)->content.ptr); |
if(noquote){ |
476 |
|
if(fprintf(stream, "%s", val->content.string) < 0){ |
477 |
|
perror("print_val"); |
478 |
|
env->err= 5; |
479 |
|
return; |
480 |
|
} |
481 |
|
} else { /* quote */ |
482 |
|
if(fprintf(stream, "\"%s\"", val->content.string) < 0){ |
483 |
|
perror("print_val"); |
484 |
|
env->err= 5; |
485 |
|
return; |
486 |
|
} |
487 |
|
} |
488 |
|
break; |
489 |
|
case symb: |
490 |
|
if(fprintf(stream, "%s", val->content.sym->id) < 0){ |
491 |
|
perror("print_val"); |
492 |
|
env->err= 5; |
493 |
|
return; |
494 |
|
} |
495 |
break; |
break; |
496 |
case ref: |
case func: |
497 |
printf("%s", ((stackitem*)(*stack_head)->content.ptr)->id); |
if(fprintf(stream, "#<function %p>", val->content.func) < 0){ |
498 |
|
perror("print_val"); |
499 |
|
env->err= 5; |
500 |
|
return; |
501 |
|
} |
502 |
break; |
break; |
503 |
case symbol: |
case port: |
504 |
default: |
if(fprintf(stream, "#<port %p>", val->content.p) < 0){ |
505 |
printf("%p", (*stack_head)->content.ptr); |
perror("print_val"); |
506 |
|
env->err= 5; |
507 |
|
return; |
508 |
|
} |
509 |
|
break; |
510 |
|
case tcons: |
511 |
|
if(fprintf(stream, "[ ") < 0){ |
512 |
|
perror("print_val"); |
513 |
|
env->err= 5; |
514 |
|
return; |
515 |
|
} |
516 |
|
tstack= stack; |
517 |
|
|
518 |
|
do { |
519 |
|
titem=malloc(sizeof(stackitem)); |
520 |
|
assert(titem != NULL); |
521 |
|
titem->item=val; |
522 |
|
titem->next=tstack; |
523 |
|
tstack=titem; /* Put it on the stack */ |
524 |
|
/* Search a stack of values being printed to see if we are already |
525 |
|
printing this value */ |
526 |
|
titem=tstack; |
527 |
|
depth=0; |
528 |
|
|
529 |
|
while(titem != NULL && titem->item != CAR(val)){ |
530 |
|
titem=titem->next; |
531 |
|
depth++; |
532 |
|
} |
533 |
|
|
534 |
|
if(titem != NULL){ /* If we found it on the stack, */ |
535 |
|
if(fprintf(stream, "#%d#", depth) < 0){ /* print a depth reference */ |
536 |
|
perror("print_val"); |
537 |
|
env->err= 5; |
538 |
|
free(titem); |
539 |
|
return; |
540 |
|
} |
541 |
|
} else { |
542 |
|
print_val(env, CAR(val), noquote, tstack, stream); |
543 |
|
} |
544 |
|
|
545 |
|
val= CDR(val); |
546 |
|
switch(val->type){ |
547 |
|
case empty: |
548 |
|
break; |
549 |
|
case tcons: |
550 |
|
/* Search a stack of values being printed to see if we are already |
551 |
|
printing this value */ |
552 |
|
titem=tstack; |
553 |
|
depth=0; |
554 |
|
|
555 |
|
while(titem != NULL && titem->item != val){ |
556 |
|
titem=titem->next; |
557 |
|
depth++; |
558 |
|
} |
559 |
|
if(titem != NULL){ /* If we found it on the stack, */ |
560 |
|
if(fprintf(stream, " . #%d#", depth) < 0){ /* print a depth reference */ |
561 |
|
perror("print_val"); |
562 |
|
env->err= 5; |
563 |
|
goto printval_end; |
564 |
|
} |
565 |
|
} else { |
566 |
|
if(fprintf(stream, " ") < 0){ |
567 |
|
perror("print_val"); |
568 |
|
env->err= 5; |
569 |
|
goto printval_end; |
570 |
|
} |
571 |
|
} |
572 |
|
break; |
573 |
|
default: |
574 |
|
if(fprintf(stream, " . ") < 0){ /* Improper list */ |
575 |
|
perror("print_val"); |
576 |
|
env->err= 5; |
577 |
|
goto printval_end; |
578 |
|
} |
579 |
|
print_val(env, val, noquote, tstack, stream); |
580 |
|
} |
581 |
|
} while(val->type == tcons && titem == NULL); |
582 |
|
|
583 |
|
printval_end: |
584 |
|
|
585 |
|
titem=tstack; |
586 |
|
while(titem != stack){ |
587 |
|
tstack=titem->next; |
588 |
|
free(titem); |
589 |
|
titem=tstack; |
590 |
|
} |
591 |
|
|
592 |
|
if(! (env->err)){ |
593 |
|
if(fprintf(stream, " ]") < 0){ |
594 |
|
perror("print_val"); |
595 |
|
env->err= 5; |
596 |
|
} |
597 |
|
} |
598 |
break; |
break; |
599 |
} |
} |
600 |
} |
} |
601 |
|
|
602 |
/* Prints the top element of the stack and then discards it. */ |
|
603 |
extern void print(stackitem** stack_head) |
/* Swap the two top elements on the stack. */ |
604 |
|
extern void swap(environment *env) |
605 |
{ |
{ |
606 |
print_(stack_head); |
value *temp= env->head; |
|
toss(stack_head); |
|
|
} |
|
607 |
|
|
608 |
/* Only to be called by function printstack. */ |
if(check_args(env, unknown, unknown, empty)) |
609 |
void print_st(stackitem* stack_head, long counter) |
return printerr(env); |
610 |
{ |
|
611 |
if(stack_head->next != NULL) |
env->head= CDR(env->head); |
612 |
print_st(stack_head->next, counter+1); |
CDR(temp)= CDR(env->head); |
613 |
|
CDR(env->head)= temp; |
614 |
|
} |
615 |
|
|
|
printf("%ld: ", counter); |
|
|
print_(&stack_head); |
|
|
nl(); |
|
|
} |
|
616 |
|
|
617 |
/* Prints the stack. */ |
/* Recall a value from a symbol, if bound */ |
618 |
extern void printstack(stackitem** stack_head) |
extern void rcl(environment *env) |
619 |
{ |
{ |
620 |
if(*stack_head != NULL) { |
value *val; |
621 |
print_st(*stack_head, 1); |
|
622 |
printf("\n"); |
if(check_args(env, symb, empty)) |
623 |
|
return printerr(env); |
624 |
|
|
625 |
|
val= CAR(env->head)->content.sym->val; |
626 |
|
if(val == NULL){ |
627 |
|
env->err= 3; |
628 |
|
return printerr(env); |
629 |
} |
} |
630 |
|
|
631 |
|
push_val(env, val); /* Return the symbol's bound value */ |
632 |
|
swap(env); |
633 |
|
if(env->err) return; |
634 |
|
env->head= CDR(env->head); |
635 |
} |
} |
636 |
|
|
637 |
/* If the top element is a reference, determine if it's a reference to a |
|
638 |
function, and if it is, toss the reference and execute the function. */ |
/* If the top element is a symbol, determine if it's bound to a |
639 |
extern void eval(stackitem** stack_head) |
function value, and if it is, toss the symbol and execute the |
640 |
|
function. */ |
641 |
|
extern void eval(environment *env) |
642 |
{ |
{ |
643 |
funcp in_func; |
funcp in_func; |
644 |
|
value* temp_val; |
645 |
|
value* iterator; |
646 |
|
|
647 |
if((*stack_head)==NULL || (*stack_head)->type!=ref) |
eval_start: |
648 |
|
|
649 |
|
gc_maybe(env); |
650 |
|
|
651 |
|
if(check_args(env, unknown, empty)) |
652 |
|
return printerr(env); |
653 |
|
|
654 |
|
switch(CAR(env->head)->type) { |
655 |
|
/* if it's a symbol */ |
656 |
|
case symb: |
657 |
|
env->errsymb= CAR(env->head)->content.sym->id; |
658 |
|
rcl(env); /* get its contents */ |
659 |
|
if(env->err) return; |
660 |
|
if(CAR(env->head)->type!=symb){ /* don't recurse symbols */ |
661 |
|
goto eval_start; |
662 |
|
} |
663 |
return; |
return; |
664 |
|
|
665 |
if(((stackitem*)(*stack_head)->content.ptr)->type==func) { |
/* If it's a lone function value, run it */ |
666 |
in_func= (funcp)((stackitem*)(*stack_head)->content.ptr)->content.ptr; |
case func: |
667 |
toss(stack_head); |
in_func= CAR(env->head)->content.func; |
668 |
(*in_func)(stack_head); |
env->head= CDR(env->head); |
669 |
|
return in_func((void*)env); |
670 |
|
|
671 |
|
/* If it's a list */ |
672 |
|
case tcons: |
673 |
|
temp_val= CAR(env->head); |
674 |
|
protect(temp_val); |
675 |
|
|
676 |
|
env->head= CDR(env->head); |
677 |
|
iterator= temp_val; |
678 |
|
|
679 |
|
while(iterator->type != empty) { |
680 |
|
push_val(env, CAR(iterator)); |
681 |
|
|
682 |
|
if(CAR(env->head)->type==symb |
683 |
|
&& CAR(env->head)->content.sym->id[0]==';') { |
684 |
|
env->head= CDR(env->head); |
685 |
|
|
686 |
|
if(CDR(iterator)->type == empty){ |
687 |
|
goto eval_start; |
688 |
|
} |
689 |
|
eval(env); |
690 |
|
if(env->err) return; |
691 |
|
} |
692 |
|
if (CDR(iterator)->type == empty || CDR(iterator)->type == tcons) |
693 |
|
iterator= CDR(iterator); |
694 |
|
else { |
695 |
|
env->err= 2; /* Improper list */ |
696 |
|
return printerr(env); |
697 |
|
} |
698 |
|
} |
699 |
|
unprotect(temp_val); |
700 |
|
return; |
701 |
|
|
702 |
|
case empty: |
703 |
|
env->head= CDR(env->head); |
704 |
|
case integer: |
705 |
|
case tfloat: |
706 |
|
case string: |
707 |
|
case port: |
708 |
|
case unknown: |
709 |
return; |
return; |
710 |
} |
} |
711 |
} |
} |
712 |
|
|
|
/* Parse input. */ |
|
|
int stack_read(stackitem** stack_head, hashtbl in_hash, char* in_line) |
|
|
{ |
|
|
char *temp, *rest; |
|
|
int itemp; |
|
|
size_t inlength= strlen(in_line)+1; |
|
|
int convert= 0; |
|
|
|
|
|
temp= malloc(inlength); |
|
|
rest= malloc(inlength); |
|
|
|
|
|
do { |
|
|
/* If string */ |
|
|
if((convert= sscanf(in_line, "\"%[^\"\n\r]\" %[^\n\r]", temp, rest))) { |
|
|
push_cstring(stack_head, temp); |
|
|
break; |
|
|
} |
|
|
/* If value */ |
|
|
if((convert= sscanf(in_line, "%d %[^\n\r]", &itemp, rest))) { |
|
|
push_val(stack_head, itemp); |
|
|
break; |
|
|
} |
|
|
/* Escape ';' with '\' */ |
|
|
if((convert= sscanf(in_line, "\\%c%[^\n\r]", temp, rest))) { |
|
|
temp[1]= '\0'; |
|
|
push_ref(stack_head, in_hash, temp); |
|
|
break; |
|
|
} |
|
|
/* If symbol */ |
|
|
if((convert= sscanf(in_line, "%[^ ;\n\r]%[^\n\r]", temp, rest))) { |
|
|
push_ref(stack_head, in_hash, temp); |
|
|
break; |
|
|
} |
|
|
/* If ';' */ |
|
|
if((convert= sscanf(in_line, "%c%[^\n\r]", temp, rest)) && *temp==';') { |
|
|
eval(stack_head); /* Evaluate top element */ |
|
|
break; |
|
|
} |
|
|
} while(0); |
|
|
|
|
713 |
|
|
714 |
free(temp); |
/* Internal forget function */ |
715 |
|
void forget_sym(symbol **hash_entry) |
716 |
|
{ |
717 |
|
symbol *temp; |
718 |
|
|
719 |
if(convert<2) { |
temp= *hash_entry; |
720 |
free(rest); |
*hash_entry= (*hash_entry)->next; |
|
return 0; |
|
|
} |
|
|
|
|
|
stack_read(stack_head, in_hash, rest); |
|
721 |
|
|
722 |
free(rest); |
free(temp->id); |
723 |
return 1; |
free(temp); |
724 |
} |
} |
725 |
|
|
726 |
/* Make a list. */ |
|
727 |
extern void pack(stackitem** stack_head) |
int main(int argc, char **argv) |
728 |
{ |
{ |
729 |
void* delimiter; |
environment myenv; |
730 |
stackitem *iterator, *temp, *pack; |
int c; /* getopt option character */ |
731 |
|
|
732 |
if((*stack_head)==NULL) /* No delimiter */ |
#ifdef __linux__ |
733 |
return; |
mtrace(); |
734 |
|
#endif |
735 |
|
|
736 |
delimiter= (*stack_head)->content.ptr; /* Get delimiter */ |
init_env(&myenv); |
|
toss(stack_head); |
|
737 |
|
|
738 |
iterator= *stack_head; |
myenv.interactive = isatty(STDIN_FILENO) && isatty(STDOUT_FILENO); |
739 |
|
|
740 |
/* Search for first delimiter */ |
while ((c = getopt (argc, argv, "i")) != -1) |
741 |
while(iterator->next!=NULL && iterator->next->content.ptr!=delimiter) |
switch (c) |
742 |
iterator= iterator->next; |
{ |
743 |
|
case 'i': |
744 |
/* Extract list */ |
myenv.interactive = 1; |
745 |
temp= *stack_head; |
break; |
746 |
*stack_head= iterator->next; |
case '?': |
747 |
iterator->next= NULL; |
fprintf (stderr, |
748 |
|
"Unknown option character '\\x%x'.\n", |
749 |
|
optopt); |
750 |
|
return EX_USAGE; |
751 |
|
default: |
752 |
|
abort (); |
753 |
|
} |
754 |
|
|
755 |
if(*stack_head!=NULL && (*stack_head)->content.ptr==delimiter) |
if (optind < argc) { |
756 |
toss(stack_head); |
myenv.interactive = 0; |
757 |
|
myenv.inputstream= fopen(argv[optind], "r"); |
758 |
|
if(myenv.inputstream== NULL) { |
759 |
|
perror(argv[0]); |
760 |
|
exit (EX_NOINPUT); |
761 |
|
} |
762 |
|
} |
763 |
|
|
764 |
/* Push list */ |
if(myenv.interactive) |
765 |
pack= malloc(sizeof(stackitem)); |
puts(start_message); |
|
pack->type= list; |
|
|
pack->content.ptr= temp; |
|
766 |
|
|
767 |
push(stack_head, pack); |
while(1) { |
768 |
|
if(myenv.in_string==NULL) { |
769 |
|
if (myenv.interactive) { |
770 |
|
if(myenv.err) { |
771 |
|
printf("(error %d)\n", myenv.err); |
772 |
|
myenv.err= 0; |
773 |
|
} |
774 |
|
printf("\n"); |
775 |
|
printstack(&myenv); |
776 |
|
printf("> "); |
777 |
|
} |
778 |
|
myenv.err=0; |
779 |
|
} |
780 |
|
readstream(&myenv, myenv.inputstream); |
781 |
|
if (myenv.err) { /* EOF or other error */ |
782 |
|
myenv.err=0; |
783 |
|
quit(&myenv); |
784 |
|
} else if(myenv.head->type!=empty |
785 |
|
&& CAR(myenv.head)->type==symb |
786 |
|
&& CAR(myenv.head)->content.sym->id[0] == ';') { |
787 |
|
if(myenv.head->type != empty) |
788 |
|
myenv.head= CDR(myenv.head); |
789 |
|
eval(&myenv); |
790 |
|
} else { |
791 |
|
gc_maybe(&myenv); |
792 |
|
} |
793 |
|
} |
794 |
|
quit(&myenv); |
795 |
|
return EXIT_FAILURE; |
796 |
} |
} |
797 |
|
|
798 |
/* Relocate elements of the list on the stack. */ |
|
799 |
extern void expand(stackitem** stack_head) |
/* Return copy of a value */ |
800 |
|
value *copy_val(environment *env, value *old_value) |
801 |
{ |
{ |
802 |
stackitem *temp, *new_head; |
value *new_value; |
803 |
|
|
804 |
/* Is top element a list? */ |
if(old_value==NULL) |
805 |
if((*stack_head)==NULL || (*stack_head)->type!=list) |
return NULL; |
806 |
return; |
|
807 |
|
new_value= new_val(env); |
808 |
|
new_value->type= old_value->type; |
809 |
|
|
810 |
|
switch(old_value->type){ |
811 |
|
case tfloat: |
812 |
|
case integer: |
813 |
|
case func: |
814 |
|
case symb: |
815 |
|
case empty: |
816 |
|
case unknown: |
817 |
|
case port: |
818 |
|
new_value->content= old_value->content; |
819 |
|
break; |
820 |
|
case string: |
821 |
|
new_value->content.string= strdup(old_value->content.string); |
822 |
|
break; |
823 |
|
case tcons: |
824 |
|
|
825 |
/* The first list element is the new stack head */ |
new_value->content.c= malloc(sizeof(pair)); |
826 |
new_head= temp= (*stack_head)->content.ptr; |
assert(new_value->content.c!=NULL); |
827 |
toss(stack_head); |
env->gc_count += sizeof(pair); |
828 |
|
|
829 |
/* Search the end of the list */ |
CAR(new_value)= copy_val(env, CAR(old_value)); /* recurse */ |
830 |
while(temp->next!=NULL) |
CDR(new_value)= copy_val(env, CDR(old_value)); /* recurse */ |
831 |
temp= temp->next; |
break; |
832 |
|
} |
833 |
/* Connect the the tail of the list with the old stack head */ |
|
834 |
temp->next= *stack_head; |
return new_value; |
|
*stack_head= new_head; /* ...and voila! */ |
|
835 |
} |
} |
836 |
|
|
837 |
/* Swap the two top elements on the stack. */ |
|
838 |
extern void swap(stackitem** stack_head) |
/* read a line from a stream; used by readline */ |
839 |
|
void readlinestream(environment *env, FILE *stream) |
840 |
{ |
{ |
841 |
stackitem* temp= (*stack_head); |
char in_string[101]; |
842 |
|
|
843 |
if((*stack_head)==NULL || (*stack_head)->next==NULL) |
if(fgets(in_string, 100, stream)==NULL) { |
844 |
return; |
push_cstring(env, ""); |
845 |
|
if (! feof(stream)){ |
846 |
|
perror("readline"); |
847 |
|
env->err= 5; |
848 |
|
} |
849 |
|
} else { |
850 |
|
push_cstring(env, in_string); |
851 |
|
} |
852 |
|
} |
853 |
|
|
|
*stack_head= (*stack_head)->next; |
|
|
temp->next= (*stack_head)->next; |
|
|
(*stack_head)->next= temp; |
|
|
} |
|
854 |
|
|
855 |
/* Compares two elements by reference. */ |
/* Reverse (flip) a list */ |
856 |
extern void eq(stackitem** stack_head) |
extern void rev(environment *env) |
857 |
{ |
{ |
858 |
void *left, *right; |
value *old_head, *new_head, *item; |
|
int result; |
|
859 |
|
|
860 |
if((*stack_head)==NULL || (*stack_head)->next==NULL) |
if(CAR(env->head)->type==empty) |
861 |
return; |
return; /* Don't reverse an empty list */ |
862 |
|
|
863 |
left= (*stack_head)->content.ptr; |
if(check_args(env, tcons, empty)) |
864 |
swap(stack_head); |
return printerr(env); |
865 |
right= (*stack_head)->content.ptr; |
|
866 |
result= (left==right); |
old_head= CAR(env->head); |
867 |
|
new_head= new_val(env); |
868 |
toss(stack_head); toss(stack_head); |
while(old_head->type != empty) { |
869 |
push_val(stack_head, (left==right)); |
item= old_head; |
870 |
|
old_head= CDR(old_head); |
871 |
|
CDR(item)= new_head; |
872 |
|
new_head= item; |
873 |
|
} |
874 |
|
CAR(env->head)= new_head; |
875 |
} |
} |
876 |
|
|
877 |
/* Negates the top element on the stack. */ |
|
878 |
extern void not(stackitem** stack_head) |
/* Make a list. */ |
879 |
|
extern void pack(environment *env) |
880 |
{ |
{ |
881 |
int value; |
value *iterator, *temp, *ending; |
882 |
|
|
883 |
if((*stack_head)==NULL || (*stack_head)->type!=value) |
ending=new_val(env); |
|
return; |
|
884 |
|
|
885 |
value= (*stack_head)->content.val; |
iterator= env->head; |
886 |
toss(stack_head); |
if(iterator->type == empty |
887 |
push_val(stack_head, !value); |
|| (CAR(iterator)->type==symb |
888 |
} |
&& CAR(iterator)->content.sym->id[0]=='[')) { |
889 |
|
temp= ending; |
890 |
|
if(env->head->type != empty) |
891 |
|
env->head= CDR(env->head); |
892 |
|
} else { |
893 |
|
/* Search for first delimiter */ |
894 |
|
while(CDR(iterator)->type != empty |
895 |
|
&& (CAR(CDR(iterator))->type!=symb |
896 |
|
|| CAR(CDR(iterator))->content.sym->id[0]!='[')) |
897 |
|
iterator= CDR(iterator); |
898 |
|
|
899 |
|
/* Extract list */ |
900 |
|
temp= env->head; |
901 |
|
env->head= CDR(iterator); |
902 |
|
CDR(iterator)= ending; |
903 |
|
|
904 |
/* Compares the two top elements on the stack and return 0 if they're the |
if(env->head->type != empty) |
905 |
same. */ |
env->head= CDR(env->head); |
906 |
extern void neq(stackitem** stack_head) |
} |
907 |
{ |
|
908 |
eq(stack_head); |
/* Push list */ |
909 |
not(stack_head); |
|
910 |
|
push_val(env, temp); |
911 |
|
rev(env); |
912 |
} |
} |
913 |
|
|
|
/* Give a symbol some content. */ |
|
|
extern void def(stackitem** stack_head) |
|
|
{ |
|
|
stackitem *temp, *value; |
|
914 |
|
|
915 |
if(*stack_head==NULL || (*stack_head)->next==NULL |
/* read from a stream; used by "read" and "readport" */ |
916 |
|| (*stack_head)->type!=ref) |
void readstream(environment *env, FILE *stream) |
917 |
return; |
{ |
918 |
|
const char symbform[]= "%[a-zA-Z0-9!$%*+./:<=>?@^_~-]%n"; |
919 |
|
const char strform[]= "\"%[^\"]\"%n"; |
920 |
|
const char intform[]= "%i%n"; |
921 |
|
const char fltform[]= "%f%n"; |
922 |
|
const char blankform[]= "%*[ \t]%n"; |
923 |
|
const char ebrackform[]= "]%n"; |
924 |
|
const char semicform[]= ";%n"; |
925 |
|
const char bbrackform[]= "[%n"; |
926 |
|
|
927 |
|
int itemp, readlength= -1; |
928 |
|
int count= -1; |
929 |
|
float ftemp; |
930 |
|
static int depth= 0; |
931 |
|
char *match; |
932 |
|
size_t inlength; |
933 |
|
|
934 |
|
if(env->in_string==NULL) { |
935 |
|
if(depth > 0 && env->interactive) { |
936 |
|
printf("]> "); |
937 |
|
} |
938 |
|
readlinestream(env, env->inputstream); |
939 |
|
if(env->err) return; |
940 |
|
|
941 |
temp= (*stack_head)->content.ptr; |
if((CAR(env->head)->content.string)[0]=='\0'){ |
942 |
value= (*stack_head)->next; |
env->err= 4; /* "" means EOF */ |
943 |
temp->content= value->content; |
return; |
944 |
value->content.ptr=NULL; |
} |
945 |
temp->type= value->type; |
|
946 |
|
env->in_string= malloc(strlen(CAR(env->head)->content.string)+1); |
947 |
|
assert(env->in_string != NULL); |
948 |
|
env->free_string= env->in_string; /* Save the original pointer */ |
949 |
|
strcpy(env->in_string, CAR(env->head)->content.string); |
950 |
|
env->head= CDR(env->head); |
951 |
|
} |
952 |
|
|
953 |
|
inlength= strlen(env->in_string)+1; |
954 |
|
match= malloc(inlength); |
955 |
|
assert(match != NULL); |
956 |
|
|
957 |
|
if(sscanf(env->in_string, blankform, &readlength) != EOF |
958 |
|
&& readlength != -1) { |
959 |
|
; |
960 |
|
} else if(sscanf(env->in_string, fltform, &ftemp, &readlength) != EOF |
961 |
|
&& readlength != -1) { |
962 |
|
if(sscanf(env->in_string, intform, &itemp, &count) != EOF |
963 |
|
&& count==readlength) { |
964 |
|
push_int(env, itemp); |
965 |
|
} else { |
966 |
|
push_float(env, ftemp); |
967 |
|
} |
968 |
|
} else if(sscanf(env->in_string, "\"\"%n", &readlength) != EOF |
969 |
|
&& readlength != -1) { |
970 |
|
push_cstring(env, ""); |
971 |
|
} else if(sscanf(env->in_string, strform, match, &readlength) != EOF |
972 |
|
&& readlength != -1) { |
973 |
|
push_cstring(env, match); |
974 |
|
} else if(sscanf(env->in_string, symbform, match, &readlength) != EOF |
975 |
|
&& readlength != -1) { |
976 |
|
push_sym(env, match); |
977 |
|
} else if(sscanf(env->in_string, ebrackform, &readlength) != EOF |
978 |
|
&& readlength != -1) { |
979 |
|
pack(env); if(env->err) return; |
980 |
|
if(depth != 0) depth--; |
981 |
|
} else if(sscanf(env->in_string, semicform, &readlength) != EOF |
982 |
|
&& readlength != -1) { |
983 |
|
push_sym(env, ";"); |
984 |
|
} else if(sscanf(env->in_string, bbrackform, &readlength) != EOF |
985 |
|
&& readlength != -1) { |
986 |
|
push_sym(env, "["); |
987 |
|
depth++; |
988 |
|
} else { |
989 |
|
free(env->free_string); |
990 |
|
env->in_string = env->free_string = NULL; |
991 |
|
} |
992 |
|
if (env->in_string != NULL) { |
993 |
|
env->in_string += readlength; |
994 |
|
} |
995 |
|
|
996 |
toss(stack_head); toss(stack_head); |
free(match); |
|
} |
|
997 |
|
|
998 |
/* Quit stack. */ |
if(depth) |
999 |
extern void quit() |
return readstream(env, env->inputstream); |
|
{ |
|
|
exit(EXIT_SUCCESS); |
|
1000 |
} |
} |
1001 |
|
|
1002 |
int main() |
|
1003 |
|
int check_args(environment *env, ...) |
1004 |
{ |
{ |
1005 |
stackitem* s= NULL; |
va_list ap; |
1006 |
hashtbl myhash; |
enum type_enum mytype; |
1007 |
char in_string[100]; |
|
1008 |
|
value *iter= env->head; |
1009 |
|
int errval= 0; |
1010 |
|
|
1011 |
|
va_start(ap, env); |
1012 |
|
while(1) { |
1013 |
|
mytype= va_arg(ap, enum type_enum); |
1014 |
|
// fprintf(stderr, "%s\n", env->errsymb); |
1015 |
|
|
1016 |
|
if(mytype==empty) |
1017 |
|
break; |
1018 |
|
|
1019 |
|
if(iter->type==empty || iter==NULL) { |
1020 |
|
errval= 1; |
1021 |
|
break; |
1022 |
|
} |
1023 |
|
|
1024 |
init_hashtbl(myhash); |
if(mytype==unknown) { |
1025 |
|
iter=CDR(iter); |
1026 |
|
continue; |
1027 |
|
} |
1028 |
|
|
1029 |
printf("okidok\n "); |
if(CAR(iter)->type!=mytype) { |
1030 |
|
errval= 2; |
1031 |
|
break; |
1032 |
|
} |
1033 |
|
|
1034 |
while(fgets(in_string, 100, stdin) != NULL) { |
iter= CDR(iter); |
|
stack_read(&s, myhash, in_string); |
|
|
printf("okidok\n "); |
|
1035 |
} |
} |
1036 |
|
|
1037 |
exit(EXIT_SUCCESS); |
va_end(ap); |
|
} |
|
1038 |
|
|
1039 |
/* Local Variables: */ |
env->err= errval; |
1040 |
/* compile-command:"make CFLAGS=\"-Wall -g -rdynamic -ldl\" stack" */ |
return errval; |
1041 |
/* End: */ |
} |