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Diffstat (limited to 'lib/unicase/u-casemap.h')
-rw-r--r--lib/unicase/u-casemap.h416
1 files changed, 416 insertions, 0 deletions
diff --git a/lib/unicase/u-casemap.h b/lib/unicase/u-casemap.h
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+/* Case mapping for UTF-8/UTF-16/UTF-32 strings (locale dependent).
+ 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/>. */
+
+UNIT *
+FUNC (const UNIT *s, size_t n,
+ casing_prefix_context_t prefix_context,
+ casing_suffix_context_t suffix_context,
+ const char *iso639_language,
+ ucs4_t (*single_character_map) (ucs4_t),
+ size_t offset_in_rule, /* offset in 'struct special_casing_rule' */
+ uninorm_t nf,
+ UNIT *resultbuf, size_t *lengthp)
+{
+ /* The result being accumulated. */
+ UNIT *result;
+ size_t length;
+ size_t allocated;
+
+ /* Initialize the accumulator. */
+ if (nf != NULL || resultbuf == NULL)
+ {
+ result = NULL;
+ allocated = 0;
+ }
+ else
+ {
+ result = resultbuf;
+ allocated = *lengthp;
+ }
+ length = 0;
+
+ {
+ const UNIT *s_end = s + n;
+
+ /* Helper for evaluating the FINAL_SIGMA condition:
+ Last character that was not case-ignorable. */
+ ucs4_t last_char_except_ignorable =
+ prefix_context.last_char_except_ignorable;
+
+ /* Helper for evaluating the AFTER_SOFT_DOTTED and AFTER_I conditions:
+ Last character that was of combining class 230 ("Above") or 0. */
+ ucs4_t last_char_normal_or_above =
+ prefix_context.last_char_normal_or_above;
+
+ while (s < s_end)
+ {
+ ucs4_t uc;
+ int count = U_MBTOUC_UNSAFE (&uc, s, s_end - s);
+
+ ucs4_t mapped_uc[3];
+ unsigned int mapped_count;
+
+ if (uc < 0x10000)
+ {
+ /* Look first in the special-casing table. */
+ char code[3];
+
+ code[0] = (uc >> 8) & 0xff;
+ code[1] = uc & 0xff;
+
+ for (code[2] = 0; ; code[2]++)
+ {
+ const struct special_casing_rule *rule =
+ gl_unicase_special_lookup (code, 3);
+
+ if (rule == NULL)
+ break;
+
+ /* Test if the condition applies. */
+ /* Does the language apply? */
+ if (rule->language[0] == '\0'
+ || (iso639_language != NULL
+ && iso639_language[0] == rule->language[0]
+ && iso639_language[1] == rule->language[1]))
+ {
+ /* Does the context apply? */
+ int context = rule->context;
+ bool applies;
+
+ if (context < 0)
+ context = - context;
+ switch (context)
+ {
+ case SCC_ALWAYS:
+ applies = true;
+ break;
+
+ case SCC_FINAL_SIGMA:
+ /* "Before" condition: preceded by a sequence
+ consisting of a cased letter and a case-ignorable
+ sequence.
+ "After" condition: not followed by a sequence
+ consisting of a case-ignorable sequence and then a
+ cased letter. */
+ /* Test the "before" condition. */
+ applies = uc_is_cased (last_char_except_ignorable);
+ /* Test the "after" condition. */
+ if (applies)
+ {
+ const UNIT *s2 = s + count;
+ for (;;)
+ {
+ if (s2 < s_end)
+ {
+ ucs4_t uc2;
+ int count2 = U_MBTOUC_UNSAFE (&uc2, s2, s_end - s2);
+ /* Our uc_is_case_ignorable function is
+ known to return false for all cased
+ characters. So we can call
+ uc_is_case_ignorable first. */
+ if (!uc_is_case_ignorable (uc2))
+ {
+ applies = ! uc_is_cased (uc2);
+ break;
+ }
+ s2 += count2;
+ }
+ else
+ {
+ applies = ! uc_is_cased (suffix_context.first_char_except_ignorable);
+ break;
+ }
+ }
+ }
+ break;
+
+ case SCC_AFTER_SOFT_DOTTED:
+ /* "Before" condition: There is a Soft_Dotted character
+ before it, with no intervening character of
+ combining class 0 or 230 (Above). */
+ /* Test the "before" condition. */
+ applies = uc_is_property_soft_dotted (last_char_normal_or_above);
+ break;
+
+ case SCC_MORE_ABOVE:
+ /* "After" condition: followed by a character of
+ combining class 230 (Above) with no intervening
+ character of combining class 0 or 230 (Above). */
+ /* Test the "after" condition. */
+ {
+ const UNIT *s2 = s + count;
+ applies = false;
+ for (;;)
+ {
+ if (s2 < s_end)
+ {
+ ucs4_t uc2;
+ int count2 = U_MBTOUC_UNSAFE (&uc2, s2, s_end - s2);
+ int ccc = uc_combining_class (uc2);
+ if (ccc == UC_CCC_A)
+ {
+ applies = true;
+ break;
+ }
+ if (ccc == UC_CCC_NR)
+ break;
+ s2 += count2;
+ }
+ else
+ {
+ applies = ((suffix_context.bits & SCC_MORE_ABOVE_MASK) != 0);
+ break;
+ }
+ }
+ }
+ break;
+
+ case SCC_BEFORE_DOT:
+ /* "After" condition: followed by COMBINING DOT ABOVE
+ (U+0307). Any sequence of characters with a
+ combining class that is neither 0 nor 230 may
+ intervene between the current character and the
+ combining dot above. */
+ /* Test the "after" condition. */
+ {
+ const UNIT *s2 = s + count;
+ applies = false;
+ for (;;)
+ {
+ if (s2 < s_end)
+ {
+ ucs4_t uc2;
+ int count2 = U_MBTOUC_UNSAFE (&uc2, s2, s_end - s2);
+ if (uc2 == 0x0307) /* COMBINING DOT ABOVE */
+ {
+ applies = true;
+ break;
+ }
+ {
+ int ccc = uc_combining_class (uc2);
+ if (ccc == UC_CCC_A || ccc == UC_CCC_NR)
+ break;
+ }
+ s2 += count2;
+ }
+ else
+ {
+ applies = ((suffix_context.bits & SCC_BEFORE_DOT_MASK) != 0);
+ break;
+ }
+ }
+ }
+ break;
+
+ case SCC_AFTER_I:
+ /* "Before" condition: There is an uppercase I before
+ it, and there is no intervening character of
+ combining class 0 or 230 (Above). */
+ /* Test the "before" condition. */
+ applies = (last_char_normal_or_above == 'I');
+ break;
+
+ default:
+ abort ();
+ }
+ if (rule->context < 0)
+ applies = !applies;
+
+ if (applies)
+ {
+ /* The rule applies.
+ Look up the mapping (0 to 3 characters). */
+ const unsigned short *mapped_in_rule =
+ (const unsigned short *)((const char *)rule + offset_in_rule);
+
+ if (mapped_in_rule[0] == 0)
+ mapped_count = 0;
+ else
+ {
+ mapped_uc[0] = mapped_in_rule[0];
+ if (mapped_in_rule[1] == 0)
+ mapped_count = 1;
+ else
+ {
+ mapped_uc[1] = mapped_in_rule[1];
+ if (mapped_in_rule[2] == 0)
+ mapped_count = 2;
+ else
+ {
+ mapped_uc[2] = mapped_in_rule[2];
+ mapped_count = 3;
+ }
+ }
+ }
+ goto found_mapping;
+ }
+ }
+
+ /* Optimization: Save a hash table lookup in the next round. */
+ if (!rule->has_next)
+ break;
+ }
+ }
+
+ /* No special-cased mapping. So use the locale and context independent
+ mapping. */
+ mapped_uc[0] = single_character_map (uc);
+ mapped_count = 1;
+
+ found_mapping:
+ /* Found the mapping: uc maps to mapped_uc[0..mapped_count-1]. */
+ {
+ unsigned int i;
+
+ for (i = 0; i < mapped_count; i++)
+ {
+ ucs4_t muc = mapped_uc[i];
+
+ /* Append muc to the result accumulator. */
+ if (length < allocated)
+ {
+ int ret = U_UCTOMB (result + length, muc, allocated - length);
+ if (ret == -1)
+ {
+ errno = EINVAL;
+ goto fail;
+ }
+ if (ret >= 0)
+ {
+ length += ret;
+ goto done_appending;
+ }
+ }
+ {
+ size_t old_allocated = allocated;
+ size_t new_allocated = 2 * old_allocated;
+ if (new_allocated < 64)
+ new_allocated = 64;
+ if (new_allocated < old_allocated) /* integer overflow? */
+ abort ();
+ {
+ UNIT *larger_result;
+ if (result == NULL)
+ {
+ larger_result = (UNIT *) malloc (new_allocated * sizeof (UNIT));
+ if (larger_result == NULL)
+ {
+ errno = ENOMEM;
+ goto fail;
+ }
+ }
+ else if (result == resultbuf)
+ {
+ larger_result = (UNIT *) malloc (new_allocated * sizeof (UNIT));
+ if (larger_result == NULL)
+ {
+ errno = ENOMEM;
+ goto fail;
+ }
+ U_CPY (larger_result, resultbuf, length);
+ }
+ else
+ {
+ larger_result =
+ (UNIT *) realloc (result, new_allocated * sizeof (UNIT));
+ if (larger_result == NULL)
+ {
+ errno = ENOMEM;
+ goto fail;
+ }
+ }
+ result = larger_result;
+ allocated = new_allocated;
+ {
+ int ret = U_UCTOMB (result + length, muc, allocated - length);
+ if (ret == -1)
+ {
+ errno = EINVAL;
+ goto fail;
+ }
+ if (ret < 0)
+ abort ();
+ length += ret;
+ goto done_appending;
+ }
+ }
+ }
+ done_appending: ;
+ }
+ }
+
+ if (!uc_is_case_ignorable (uc))
+ last_char_except_ignorable = uc;
+
+ {
+ int ccc = uc_combining_class (uc);
+ if (ccc == UC_CCC_A || ccc == UC_CCC_NR)
+ last_char_normal_or_above = uc;
+ }
+
+ s += count;
+ }
+ }
+
+ if (nf != NULL)
+ {
+ /* Finally, normalize the result. */
+ UNIT *normalized_result;
+
+ normalized_result = U_NORMALIZE (nf, result, length, resultbuf, lengthp);
+ if (normalized_result == NULL)
+ goto fail;
+
+ free (result);
+ return normalized_result;
+ }
+
+ if (length == 0)
+ {
+ if (result == NULL)
+ {
+ /* Return a non-NULL value. NULL means error. */
+ result = (UNIT *) malloc (1);
+ if (result == NULL)
+ {
+ errno = ENOMEM;
+ goto fail;
+ }
+ }
+ }
+ else if (result != resultbuf && length < allocated)
+ {
+ /* Shrink the allocated memory if possible. */
+ UNIT *memory;
+
+ memory = (UNIT *) realloc (result, length * sizeof (UNIT));
+ if (memory != NULL)
+ result = memory;
+ }
+
+ *lengthp = length;
+ return result;
+
+ fail:
+ if (result != resultbuf)
+ {
+ int saved_errno = errno;
+ free (result);
+ errno = saved_errno;
+ }
+ return NULL;
+}
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