From 5153218b41a5984673900d080daf4e3273e1d117 Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Thu, 5 Jan 2023 16:26:41 -0700
Subject: [PATCH] [set] Add hb_set_is_inverted()

---
 docs/harfbuzz-sections.txt   |  1 +
 src/hb-bit-set-invertible.hh |  5 +++++
 src/hb-set.cc                | 16 ++++++++++++++++
 src/hb-set.h                 |  3 +++
 src/hb-set.hh                |  1 +
 src/test-set.cc              |  3 ++-
 6 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/docs/harfbuzz-sections.txt b/docs/harfbuzz-sections.txt
index 7a6848be7..78158dfa0 100644
--- a/docs/harfbuzz-sections.txt
+++ b/docs/harfbuzz-sections.txt
@@ -750,6 +750,7 @@ hb_set_intersect
 hb_set_union
 hb_set_symmetric_difference
 hb_set_invert
+hb_set_is_inverted
 hb_set_is_equal
 hb_set_is_subset
 hb_set_next
diff --git a/src/hb-bit-set-invertible.hh b/src/hb-bit-set-invertible.hh
index ff8aecc60..1eb1b1c20 100644
--- a/src/hb-bit-set-invertible.hh
+++ b/src/hb-bit-set-invertible.hh
@@ -74,6 +74,11 @@ struct hb_bit_set_invertible_t
       inverted = !inverted;
   }
 
+  bool is_inverted () const
+  {
+    return inverted;
+  }
+
   bool is_empty () const
   {
     hb_codepoint_t v = INVALID;
diff --git a/src/hb-set.cc b/src/hb-set.cc
index 0270b2199..4496120fe 100644
--- a/src/hb-set.cc
+++ b/src/hb-set.cc
@@ -491,6 +491,22 @@ hb_set_invert (hb_set_t *set)
   set->invert ();
 }
 
+/**
+ * hb_set_is_inverted:
+ * @set: A set
+ *
+ * Returns whether the set is inverted.
+ *
+ * Return value: `true` if the set is inverted, `false` otherwise
+ *
+ * Since: REPLACEME
+ **/
+hb_bool_t
+hb_set_is_inverted (const hb_set_t *set)
+{
+  return set->is_inverted ();
+}
+
 /**
  * hb_set_get_population:
  * @set: A set
diff --git a/src/hb-set.h b/src/hb-set.h
index 93636ab5d..de5323103 100644
--- a/src/hb-set.h
+++ b/src/hb-set.h
@@ -97,6 +97,9 @@ hb_set_is_empty (const hb_set_t *set);
 HB_EXTERN void
 hb_set_invert (hb_set_t *set);
 
+HB_EXTERN hb_bool_t
+hb_set_is_inverted (const hb_set_t *set);
+
 HB_EXTERN hb_bool_t
 hb_set_has (const hb_set_t *set,
 	    hb_codepoint_t  codepoint);
diff --git a/src/hb-set.hh b/src/hb-set.hh
index b13d5372c..604802381 100644
--- a/src/hb-set.hh
+++ b/src/hb-set.hh
@@ -79,6 +79,7 @@ struct hb_sparseset_t
   void reset () { s.reset (); }
   void clear () { s.clear (); }
   void invert () { s.invert (); }
+  bool is_inverted () const { return s.is_inverted (); }
   bool is_empty () const { return s.is_empty (); }
   uint32_t hash () const { return s.hash (); }
 
diff --git a/src/test-set.cc b/src/test-set.cc
index a0b7ac9ea..9fe319da6 100644
--- a/src/test-set.cc
+++ b/src/test-set.cc
@@ -132,7 +132,8 @@ main (int argc, char **argv)
     assert (last == 4);
     assert (!s.previous_range (&start, &last));
 
-    /* Inverted set returns true for invalid value. */
+    assert (s.is_inverted ());
+    /* Inverted set returns true for invalid value; oh well. */
     assert (s.has (HB_SET_VALUE_INVALID));
   }