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authorJörg Frings-Fürst <debian@jff.email>2018-06-28 04:19:22 +0200
committerJörg Frings-Fürst <debian@jff.email>2018-06-28 04:19:22 +0200
commitc4f76880e9589a757a194c19a4526599dfe71f50 (patch)
treec66def0aa296e781c51dfc51c8bba9d8ac51189b /lib/unicase/u-suffix-context.h
parent76ef1d8e3249e82a6965fd17157bee00a7857ff3 (diff)
parent7b65dbd4ebade81d504cfe5e681292a58ad1fdf0 (diff)
Update upstream source from tag 'upstream/0.9.10'
Update to upstream version '0.9.10' with Debian dir 9736048cfd7ea97640dba10ba42a3839100c5694
Diffstat (limited to 'lib/unicase/u-suffix-context.h')
-rw-r--r--lib/unicase/u-suffix-context.h99
1 files changed, 99 insertions, 0 deletions
diff --git a/lib/unicase/u-suffix-context.h b/lib/unicase/u-suffix-context.h
new file mode 100644
index 0000000..01ee18e
--- /dev/null
+++ b/lib/unicase/u-suffix-context.h
@@ -0,0 +1,99 @@
+/* Case-mapping context of suffix UTF-8/UTF-16/UTF-32 string.
+ Copyright (C) 2009-2018 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 either:
+
+ * 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.
+
+ or
+
+ * the GNU General Public License as published by the Free
+ Software Foundation; either version 2 of the License, or (at your
+ option) any later version.
+
+ or both in parallel, as here.
+ 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 <https://www.gnu.org/licenses/>. */
+
+casing_suffix_context_t
+FUNC1 (const UNIT *s, size_t n)
+{
+ return FUNC2 (s, n, unicase_empty_suffix_context);
+}
+
+casing_suffix_context_t
+FUNC2 (const UNIT *s, size_t n, casing_suffix_context_t a_context)
+{
+ casing_suffix_context_t context;
+ /* Evaluate all three conditions in a single pass through the string S.
+ The three variables are -1 as long as the value of the condition has
+ not been determined. */
+ ucs4_t first_char_except_ignorable = (ucs4_t)(-1);
+ int scc_MORE_ABOVE = -1;
+ int scc_BEFORE_DOT = -1;
+ const UNIT *s_end = s + n;
+
+ while (s < s_end)
+ {
+ ucs4_t uc;
+ int count = U_MBTOUC_UNSAFE (&uc, s, s_end - s);
+
+ if (first_char_except_ignorable == (ucs4_t)(-1))
+ {
+ if (!uc_is_case_ignorable (uc))
+ first_char_except_ignorable = uc;
+ }
+
+ if (scc_MORE_ABOVE < 0)
+ {
+ int ccc = uc_combining_class (uc);
+ if (ccc == UC_CCC_A)
+ scc_MORE_ABOVE = SCC_MORE_ABOVE_MASK;
+ else if (ccc == UC_CCC_NR)
+ scc_MORE_ABOVE = 0;
+ }
+
+ if (scc_BEFORE_DOT < 0)
+ {
+ if (uc == 0x0307) /* COMBINING DOT ABOVE */
+ scc_BEFORE_DOT = SCC_BEFORE_DOT_MASK;
+ else
+ {
+ int ccc = uc_combining_class (uc);
+ if (ccc == UC_CCC_A || ccc == UC_CCC_NR)
+ scc_BEFORE_DOT = 0;
+ }
+ }
+
+ if (first_char_except_ignorable != (ucs4_t)(-1)
+ && (scc_MORE_ABOVE | scc_BEFORE_DOT) >= 0)
+ /* All conditions have been determined. */
+ break;
+
+ s += count;
+ }
+
+ /* For those conditions that have not been determined so far, use the
+ value from the argument context. */
+ context.first_char_except_ignorable =
+ (first_char_except_ignorable != (ucs4_t)(-1)
+ ? first_char_except_ignorable
+ : a_context.first_char_except_ignorable);
+ context.bits =
+ (scc_MORE_ABOVE >= 0
+ ? scc_MORE_ABOVE
+ : a_context.bits & SCC_MORE_ABOVE_MASK)
+ | (scc_BEFORE_DOT >= 0
+ ? scc_BEFORE_DOT
+ : a_context.bits & SCC_BEFORE_DOT_MASK);
+ return context;
+}