1 files changed, 63 insertions, 0 deletions
diff --git a/stdlib/ranges.c b/stdlib/ranges.c
new file mode 100644
index 00000000..9dfd1efe
--- /dev/null
+++ b/stdlib/ranges.c
@@ -0,0 +1,63 @@
+// Functions that operate on numeric ranges
+
+#include <ctype.h>
+#include <err.h>
+#include <gc.h>
+#include <math.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <sys/param.h>
+
+#include "integers.h"
+#include "text.h"
+#include "types.h"
+#include "util.h"
+
+
+PUREFUNC static int32_t Range$compare(const Range_t *x, const Range_t *y, const TypeInfo *type)
+{
+    (void)type;
+    if (x == y) return 0;
+    int32_t diff = Int$compare(&x->first, &y->first, &Int$info);
+    if (diff != 0) return diff;
+    diff = Int$compare(&x->last, &y->last, &Int$info);
+    if (diff != 0) return diff;
+    return Int$compare(&x->step, &y->step, &Int$info);
+}
+
+PUREFUNC static bool Range$equal(const Range_t *x, const Range_t *y, const TypeInfo *type)
+{
+    (void)type;
+    if (x == y) return true;
+    return Int$equal(&x->first, &y->first, &Int$info) && Int$equal(&x->last, &y->last, &Int$info) && Int$equal(&x->step, &y->step, &Int$info);
+}
+
+static Text_t Range$as_text(const Range_t *r, bool use_color, const TypeInfo *type)
+{
+    (void)type;
+    if (!r) return Text("Range");
+
+    return Text$format(use_color ? "\x1b[0;1mRange\x1b[m(first=%r, last=%r, step=%r)"
+                       : "Range(first=%r, last=%r, step=%r)",
+                       Int$as_text(&r->first, use_color, &Int$info), Int$as_text(&r->last, use_color, &Int$info),
+                       Int$as_text(&r->step, use_color, &Int$info));
+}
+
+PUREFUNC public Range_t Range$reversed(Range_t r)
+{
+    return (Range_t){r.last, r.first, Int$negative(r.step)};
+}
+
+PUREFUNC public Range_t Range$by(Range_t r, Int_t step)
+{
+    return (Range_t){r.first, r.last, Int$times(step, r.step)};
+}
+
+public const TypeInfo Range = {sizeof(Range_t), __alignof(Range_t), {.tag=CustomInfo, .CustomInfo={
+    .as_text=(void*)Range$as_text,
+    .compare=(void*)Range$compare,
+    .equal=(void*)Range$equal,
+}}};
+
+// vim: ts=4 sw=0 et cino=L2,l1,(0,W4,m1,\:0