New module 'uninorm/canonical-decomposition'.

diff --git a/ChangeLog b/ChangeLog
index 45730c5..95878fe 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2009-02-21  Bruno Haible  <bruno@clisp.org>
 
+       New module 'uninorm/canonical-decomposition'.
+       * lib/uninorm/canonical-decomposition.c: New file.
+       * modules/uninorm/canonical-decomposition: New file.
+
        Tests for module 'uninorm/decomposition'.
        * tests/uninorm/test-decomposition.c: New file.
        * modules/uninorm/decomposition-tests: New file.

diff --git a/lib/uninorm/canonical-decomposition.c b/lib/uninorm/canonical-decomposition.c
new file mode 100644 (file)
index 0000000..9afaead
--- /dev/null
+++ b/lib/uninorm/canonical-decomposition.c
@@ -0,0 +1,87 @@
+/* Canonical decomposition of Unicode characters.
+   Copyright (C) 2009 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 2009.
+
+   This program is free software: you can redistribute it and/or modify it
+   under the terms of the GNU Lesser General Public License as published
+   by the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include "uninorm.h"
+
+#include <stdlib.h>
+
+#include "decomposition-table.h"
+
+int
+uc_canonical_decomposition (ucs4_t uc, ucs4_t *decomposition)
+{
+  if (uc >= 0xAC00 && uc < 0xD7A4)
+    {
+      /* Hangul syllable.  See Unicode standard, chapter 3,
+        section "Hangul Syllable Decomposition".  */
+      unsigned int t, v, l;
+
+      uc -= 0xAC00;
+      t = uc % 28;
+      uc = uc / 28;
+      v = uc % 21;
+      l = uc / 21;
+
+      decomposition[0] = 0x1100 + l;
+      decomposition[1] = 0x1161 + v;
+      if (t == 0)
+       return 2;
+      else
+       {
+         decomposition[2] = 0x11A7 + t;
+         return 3;
+       }
+    }
+  else if (uc < 0x110000)
+    {
+      unsigned short entry = decomp_index (uc);
+      /* An entry of (unsigned short)(-1) denotes an absent entry.
+        Otherwise, bit 15 of the entry tells whether the decomposition
+        is a canonical one.  */
+      if (entry < 0x8000)
+       {
+         const unsigned char *p;
+         unsigned int element;
+         unsigned int length;
+
+         p = &gl_uninorm_decomp_chars_table[3 * entry];
+         element = (p[0] << 16) | (p[1] << 8) | p[2];
+         /* The first element has 5 bits for the decomposition type.  */
+         if (((element >> 18) & 0x1f) != UC_DECOMP_CANONICAL)
+           abort ();
+         length = 1;
+         for (;;)
+           {
+             /* Every element has an 18 bits wide Unicode code point.  */
+             *decomposition = element & 0x3ffff;
+             /* Bit 23 tells whether there are more elements,  */
+             if ((element & (1 << 23)) == 0)
+               break;
+             p += 3;
+             element = (p[0] << 16) | (p[1] << 8) | p[2];
+             decomposition++;
+             length++;
+           }
+         return length;
+       }
+    }
+  return -1;
+}
+

diff --git a/modules/uninorm/canonical-decomposition b/modules/uninorm/canonical-decomposition
new file mode 100644 (file)
index 0000000..8579e6e
--- /dev/null
+++ b/modules/uninorm/canonical-decomposition
@@ -0,0 +1,24 @@
+Description:
+Canonical decomposition of Unicode characters.
+
+Files:
+lib/uninorm/canonical-decomposition.c
+
+Depends-on:
+uninorm/base
+uninorm/decomposition-table
+
+configure.ac:
+
+Makefile.am:
+lib_SOURCES += uninorm/canonical-decomposition.c
+
+Include:
+"uninorm.h"
+
+License:
+LGPL
+
+Maintainer:
+Bruno Haible
+