Bug 515432 – Add function to get bidirectional character type of a

2008-04-21  Behdad Esfahbod  <behdad@gnome.org>

        Bug 515432 – Add function to get bidirectional character type of a
        unicode character
        Patch from Jürg Billeter

        * docs/pango-sections.txt:
        * docs/tmpl/layout.sgml:
        * docs/tmpl/main.sgml:
        * docs/tmpl/pangocairo.sgml:
        * pango/Makefile.am:
        * pango/pango-bidi-type.c (pango_bidi_type_for_unichar):
        * pango/pango-bidi-type.h:
        * pango/pango-types.h:
        * pango/pango-utils.c (pango_log2vis_get_embedding_levels),
        (pango_unichar_direction):
        * pango/pango.def:
        * pango/pango.h:
        New public API:

                enum PangoBidiType;
                pango_bidi_type_get_type()
                pango_bidi_type_for_unichar()


svn path=/trunk/; revision=2607

1 files changed, 75 insertions, 0 deletions

diff --git a/pango/pango-bidi-type.c b/pango/pango-bidi-type.c
new file mode 100644
index 00000000..45d1d936
--- /dev/null
+++ b/pango/pango-bidi-type.c
@@ -0,0 +1,75 @@
+/* Pango
+ * pango-bidi-type.c: Bidirectional Character Types
+ *
+ * Copyright (C) 2008 Jürg Billeter <j@bitron.ch>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <config.h>
+
+#include "pango-bidi-type.h"
+
+#include "mini-fribidi/fribidi.h"
+
+
+
+/**
+ * pango_bidi_type_for_unichar
+ * @ch: a Unicode character
+ *
+ * Determines the normative bidirectional character type of a
+ * character, as specified in the Unicode Character Database.
+ *
+ * A simplified version of this function is available as
+ * pango_unichar_get_direction().
+ *
+ * Return value: the bidirectional character type, as used in the
+ * Unicode bidirectional algorithm.
+ *
+ * Since: 1.22
+ */
+PangoBidiType
+pango_bidi_type_for_unichar (gunichar ch)
+{
+  FriBidiCharType fribidi_ch_type = fribidi_get_type (ch);
+
+  switch (fribidi_ch_type)
+    {
+    case FRIBIDI_TYPE_LTR:  return PANGO_BIDI_TYPE_L;
+    case FRIBIDI_TYPE_LRE:  return PANGO_BIDI_TYPE_LRE;
+    case FRIBIDI_TYPE_LRO:  return PANGO_BIDI_TYPE_LRO;
+    case FRIBIDI_TYPE_RTL:  return PANGO_BIDI_TYPE_R;
+    case FRIBIDI_TYPE_AL:   return PANGO_BIDI_TYPE_AL;
+    case FRIBIDI_TYPE_RLE:  return PANGO_BIDI_TYPE_RLE;
+    case FRIBIDI_TYPE_RLO:  return PANGO_BIDI_TYPE_RLO;
+    case FRIBIDI_TYPE_PDF:  return PANGO_BIDI_TYPE_PDF;
+    case FRIBIDI_TYPE_EN:   return PANGO_BIDI_TYPE_EN;
+    case FRIBIDI_TYPE_ES:   return PANGO_BIDI_TYPE_ES;
+    case FRIBIDI_TYPE_ET:   return PANGO_BIDI_TYPE_ET;
+    case FRIBIDI_TYPE_AN:   return PANGO_BIDI_TYPE_AN;
+    case FRIBIDI_TYPE_CS:   return PANGO_BIDI_TYPE_CS;
+    case FRIBIDI_TYPE_NSM:  return PANGO_BIDI_TYPE_NSM;
+    case FRIBIDI_TYPE_BN:   return PANGO_BIDI_TYPE_BN;
+    case FRIBIDI_TYPE_BS:   return PANGO_BIDI_TYPE_B;
+    case FRIBIDI_TYPE_SS:   return PANGO_BIDI_TYPE_S;
+    case FRIBIDI_TYPE_WS:   return PANGO_BIDI_TYPE_WS;
+    case FRIBIDI_TYPE_ON:   return PANGO_BIDI_TYPE_ON;
+    default:
+      g_assert_not_reached ();
+      return PANGO_BIDI_TYPE_ON;
+    }
+}