#include "libpspp/cast.h"
#include "libpspp/misc.h"
-
#include "gl/ftoastr.h"
#include "gl/xalloc.h"
-/* Initializes TOKEN with an arbitrary type, number 0, and a null string. */
+/* Initializes DST as a copy of SRC. */
void
-token_init (struct token *token)
+token_copy (struct token *dst, const struct token *src)
{
- token->type = 0;
- token->number = 0.0;
- token->string = ss_empty ();
+ *dst = (struct token) {
+ .type = src->type,
+ .number = src->number,
+ .string = ss_clone (src->string),
+ };
}
/* Frees the string that TOKEN contains. */
token_uninit (struct token *token)
{
if (token != NULL)
- ss_dealloc (&token->string);
+ {
+ ss_dealloc (&token->string);
+ *token = (struct token) { .type = T_STOP };
+ }
+}
+
+/* Returns true if A and B are the same token, false otherwise. */
+bool
+token_equal (const struct token *a, const struct token *b)
+{
+ if (a->type != b->type)
+ return false;
+
+ switch (a->type)
+ {
+ case T_POS_NUM:
+ case T_NEG_NUM:
+ return a->number == b->number;
+
+ case T_ID:
+ case T_MACRO_ID:
+ case T_MACRO_PUNCT:
+ case T_STRING:
+ return ss_equals (a->string, b->string);
+
+ default:
+ return true;
+ }
}
static char *
return string_representation (token->string);
default:
- return xstrdup_if_nonnull (token_type_to_name (token->type));
+ return xstrdup_if_nonnull (token_type_to_string (token->type));
}
}
putc ('\n', stream);
}
+/* Returns true if T is a numeric token for an integer in the range of "long",
+ except that LONG_MIN is excluded. */
bool
token_is_integer (const struct token *t)
{
&& floor (t->number) == t->number);
}
+/* Returns the "long int" value of T, which must satisfy token_is_integer(T). */
long
token_integer (const struct token *t)
{