New files implementing GSequence, a list implemented using a binary tree.

[platform/upstream/glib.git] / glib / guniprop.c

diff --git a/glib/guniprop.c b/glib/guniprop.c
index f2f6417..908d3fe 100644 (file)
--- a/glib/guniprop.c
+++ b/glib/guniprop.c
@@ -85,6 +85,11 @@
                            OR (G_UNICODE_COMBINING_MARK,       \
                            OR (G_UNICODE_ENCLOSING_MARK,       0))))
 
+#define ISZEROWIDTHTYPE(Type)  IS ((Type),                     \
+                           OR (G_UNICODE_NON_SPACING_MARK,     \
+                           OR (G_UNICODE_ENCLOSING_MARK,       \
+                           OR (G_UNICODE_FORMAT,               0))))
+
 /**
  * g_unichar_isalnum:
  * @c: a Unicode character
@@ -352,6 +357,40 @@ g_unichar_isdefined (gunichar c)
 }
 
 /**
+ * g_unichar_iszerowidth:
+ * @c: a Unicode character
+ * 
+ * Determines if a given character typically takes zero width when rendered.
+ * The return value is %TRUE for all non-spacing and enclosing marks
+ * (e.g., combining accents), format characters, zero-width
+ * space, but not U+00AD SOFT HYPHEN.
+ *
+ * A typical use of this function is with one of g_unichar_iswide() or
+ * g_unichar_iswide_cjk() to determine the number of cells a string occupies
+ * when displayed on a grid display (terminals).  However, note that not all
+ * terminals support zero-width rendering of zero-width marks.
+ *
+ * Return value: %TRUE if the character has zero width
+ *
+ * Since: 2.14
+ **/
+gboolean
+g_unichar_iszerowidth (gunichar c)
+{
+  if (G_UNLIKELY (c == 0x00AD))
+    return FALSE;
+
+  if (G_UNLIKELY (ISZEROWIDTHTYPE (TYPE (c))))
+    return TRUE;
+
+  if (G_UNLIKELY ((c >= 0x1160 && c < 0x1200) ||
+                 c == 0x200B))
+    return TRUE;
+
+  return FALSE;
+}
+
+/**
  * g_unichar_iswide:
  * @c: a Unicode character
  *