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script: add length

This commit is contained in:
Přemysl Eric Janouch 2014-07-31 02:45:04 +02:00
parent ba3f4e620c
commit 2735756dbd
1 changed files with 33 additions and 2 deletions
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35
plugins/script
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@ -910,6 +910,35 @@ defn (fn_to_float)
return true;
}
// - - Miscellaneous - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
defn (fn_length)
{
check_stack (1);
struct item *item = pop (ctx);
bool success = true;
switch (item->type)
{
case ITEM_STRING:
push (ctx, new_integer (((struct item_string *) item)->len));
break;
case ITEM_LIST:
{
long long length = 0;
struct item *iter;
for (iter = get_list (item); iter; iter = iter->next)
length++;
push (ctx, new_integer (length));
break;
}
default:
ctx->error = strdup ("invalid type");
success = false;
}
item_free (item);
return success;
}
// - - Stack operations - - - - - - - - - - - - - - - - - - - - - - - - - - - -
defn (fn_dup)
@ -1654,7 +1683,6 @@ item_list_to_str (const struct item *script, struct buffer *buf)
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// TODO: implement more functions; try to avoid writing it in C
// length -- length of a list/string
// -, /, %, ** -- arithmetic
// at { value index -- sub-value } -- get n-th subvalue of a string/list
@ -1687,7 +1715,7 @@ init_runtime_library_scripts (void)
struct item *script = parse (scripts[i].definition, &error);
if (error)
{
fprintf (stderr, "error parsing internal script `%s': %s=n",
fprintf (stderr, "error parsing internal script `%s': %s\n",
scripts[i].definition, error);
free (error);
exit (EXIT_FAILURE);
@ -1713,6 +1741,9 @@ init_runtime_library (void)
register_handler (">integer", fn_to_integer);
register_handler (">float", fn_to_float);
// Miscellaneous
register_handler ("length", fn_length);
// Basic stack manipulation
register_handler ("dup", fn_dup);
register_handler ("drop", fn_drop);