583 lines
16 KiB
C++
583 lines
16 KiB
C++
/*
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* Copyright © 2009 Red Hat, Inc.
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* Copyright © 2011 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Red Hat Author(s): Behdad Esfahbod
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* Google Author(s): Behdad Esfahbod, Roozbeh Pournader
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*/
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#include "hb.hh"
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#ifndef HB_NO_OT_TAG
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/* hb_script_t */
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static hb_tag_t
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hb_ot_old_tag_from_script (hb_script_t script)
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{
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/* This seems to be accurate as of end of 2012. */
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switch ((hb_tag_t) script)
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{
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case HB_SCRIPT_INVALID: return HB_OT_TAG_DEFAULT_SCRIPT;
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case HB_SCRIPT_MATH: return HB_OT_TAG_MATH_SCRIPT;
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/* KATAKANA and HIRAGANA both map to 'kana' */
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case HB_SCRIPT_HIRAGANA: return HB_TAG('k','a','n','a');
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/* Spaces at the end are preserved, unlike ISO 15924 */
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case HB_SCRIPT_LAO: return HB_TAG('l','a','o',' ');
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case HB_SCRIPT_YI: return HB_TAG('y','i',' ',' ');
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/* Unicode-5.0 additions */
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case HB_SCRIPT_NKO: return HB_TAG('n','k','o',' ');
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/* Unicode-5.1 additions */
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case HB_SCRIPT_VAI: return HB_TAG('v','a','i',' ');
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}
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/* Else, just change first char to lowercase and return */
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return ((hb_tag_t) script) | 0x20000000u;
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}
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static hb_script_t
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hb_ot_old_tag_to_script (hb_tag_t tag)
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{
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if (unlikely (tag == HB_OT_TAG_DEFAULT_SCRIPT))
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return HB_SCRIPT_INVALID;
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if (unlikely (tag == HB_OT_TAG_MATH_SCRIPT))
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return HB_SCRIPT_MATH;
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/* This side of the conversion is fully algorithmic. */
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/* Any spaces at the end of the tag are replaced by repeating the last
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* letter. Eg 'nko ' -> 'Nkoo' */
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if (unlikely ((tag & 0x0000FF00u) == 0x00002000u))
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tag |= (tag >> 8) & 0x0000FF00u; /* Copy second letter to third */
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if (unlikely ((tag & 0x000000FFu) == 0x00000020u))
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tag |= (tag >> 8) & 0x000000FFu; /* Copy third letter to fourth */
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/* Change first char to uppercase and return */
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return (hb_script_t) (tag & ~0x20000000u);
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}
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static hb_tag_t
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hb_ot_new_tag_from_script (hb_script_t script)
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{
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switch ((hb_tag_t) script) {
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case HB_SCRIPT_BENGALI: return HB_TAG('b','n','g','2');
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case HB_SCRIPT_DEVANAGARI: return HB_TAG('d','e','v','2');
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case HB_SCRIPT_GUJARATI: return HB_TAG('g','j','r','2');
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case HB_SCRIPT_GURMUKHI: return HB_TAG('g','u','r','2');
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case HB_SCRIPT_KANNADA: return HB_TAG('k','n','d','2');
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case HB_SCRIPT_MALAYALAM: return HB_TAG('m','l','m','2');
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case HB_SCRIPT_ORIYA: return HB_TAG('o','r','y','2');
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case HB_SCRIPT_TAMIL: return HB_TAG('t','m','l','2');
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case HB_SCRIPT_TELUGU: return HB_TAG('t','e','l','2');
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case HB_SCRIPT_MYANMAR: return HB_TAG('m','y','m','2');
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}
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return HB_OT_TAG_DEFAULT_SCRIPT;
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}
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static hb_script_t
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hb_ot_new_tag_to_script (hb_tag_t tag)
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{
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switch (tag) {
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case HB_TAG('b','n','g','2'): return HB_SCRIPT_BENGALI;
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case HB_TAG('d','e','v','2'): return HB_SCRIPT_DEVANAGARI;
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case HB_TAG('g','j','r','2'): return HB_SCRIPT_GUJARATI;
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case HB_TAG('g','u','r','2'): return HB_SCRIPT_GURMUKHI;
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case HB_TAG('k','n','d','2'): return HB_SCRIPT_KANNADA;
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case HB_TAG('m','l','m','2'): return HB_SCRIPT_MALAYALAM;
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case HB_TAG('o','r','y','2'): return HB_SCRIPT_ORIYA;
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case HB_TAG('t','m','l','2'): return HB_SCRIPT_TAMIL;
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case HB_TAG('t','e','l','2'): return HB_SCRIPT_TELUGU;
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case HB_TAG('m','y','m','2'): return HB_SCRIPT_MYANMAR;
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}
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return HB_SCRIPT_UNKNOWN;
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}
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#ifndef HB_DISABLE_DEPRECATED
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void
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hb_ot_tags_from_script (hb_script_t script,
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hb_tag_t *script_tag_1,
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hb_tag_t *script_tag_2)
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{
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unsigned int count = 2;
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hb_tag_t tags[2];
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hb_ot_tags_from_script_and_language (script, HB_LANGUAGE_INVALID, &count, tags, nullptr, nullptr);
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*script_tag_1 = count > 0 ? tags[0] : HB_OT_TAG_DEFAULT_SCRIPT;
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*script_tag_2 = count > 1 ? tags[1] : HB_OT_TAG_DEFAULT_SCRIPT;
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}
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#endif
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/*
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* Complete list at:
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* https://docs.microsoft.com/en-us/typography/opentype/spec/scripttags
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*
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* Most of the script tags are the same as the ISO 15924 tag but lowercased.
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* So we just do that, and handle the exceptional cases in a switch.
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*/
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static void
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hb_ot_all_tags_from_script (hb_script_t script,
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unsigned int *count /* IN/OUT */,
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hb_tag_t *tags /* OUT */)
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{
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unsigned int i = 0;
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hb_tag_t new_tag = hb_ot_new_tag_from_script (script);
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if (unlikely (new_tag != HB_OT_TAG_DEFAULT_SCRIPT))
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{
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/* HB_SCRIPT_MYANMAR maps to 'mym2', but there is no 'mym3'. */
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if (new_tag != HB_TAG('m','y','m','2'))
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tags[i++] = new_tag | '3';
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if (*count > i)
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tags[i++] = new_tag;
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}
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if (*count > i)
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{
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hb_tag_t old_tag = hb_ot_old_tag_from_script (script);
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if (old_tag != HB_OT_TAG_DEFAULT_SCRIPT)
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tags[i++] = old_tag;
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}
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*count = i;
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}
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/**
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* hb_ot_tag_to_script:
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* @tag: a script tag
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*
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* Converts a script tag to an #hb_script_t.
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*
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* Return value: The #hb_script_t corresponding to @tag.
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*
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**/
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hb_script_t
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hb_ot_tag_to_script (hb_tag_t tag)
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{
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unsigned char digit = tag & 0x000000FFu;
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if (unlikely (digit == '2' || digit == '3'))
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return hb_ot_new_tag_to_script (tag & 0xFFFFFF32);
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return hb_ot_old_tag_to_script (tag);
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}
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/* hb_language_t */
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static bool
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subtag_matches (const char *lang_str,
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const char *limit,
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const char *subtag)
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{
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do {
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const char *s = strstr (lang_str, subtag);
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if (!s || s >= limit)
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return false;
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if (!ISALNUM (s[strlen (subtag)]))
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return true;
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lang_str = s + strlen (subtag);
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} while (true);
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}
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static hb_bool_t
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lang_matches (const char *lang_str, const char *spec)
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{
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unsigned int len = strlen (spec);
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return strncmp (lang_str, spec, len) == 0 &&
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(lang_str[len] == '\0' || lang_str[len] == '-');
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}
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struct LangTag
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{
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char language[4];
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hb_tag_t tag;
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int cmp (const char *a) const
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{
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const char *b = this->language;
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unsigned int da, db;
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const char *p;
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p = strchr (a, '-');
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da = p ? (unsigned int) (p - a) : strlen (a);
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p = strchr (b, '-');
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db = p ? (unsigned int) (p - b) : strlen (b);
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return strncmp (a, b, hb_max (da, db));
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}
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int cmp (const LangTag *that) const
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{ return cmp (that->language); }
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};
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#include "hb-ot-tag-table.hh"
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/* The corresponding languages IDs for the following IDs are unclear,
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* overlap, or are architecturally weird. Needs more research. */
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/*{"??", {HB_TAG('B','C','R',' ')}},*/ /* Bible Cree */
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/*{"zh?", {HB_TAG('C','H','N',' ')}},*/ /* Chinese (seen in Microsoft fonts) */
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/*{"ar-Syrc?", {HB_TAG('G','A','R',' ')}},*/ /* Garshuni */
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/*{"??", {HB_TAG('N','G','R',' ')}},*/ /* Nagari */
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/*{"??", {HB_TAG('Y','I','C',' ')}},*/ /* Yi Classic */
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/*{"zh?", {HB_TAG('Z','H','P',' ')}},*/ /* Chinese Phonetic */
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#ifndef HB_DISABLE_DEPRECATED
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hb_tag_t
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hb_ot_tag_from_language (hb_language_t language)
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{
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unsigned int count = 1;
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hb_tag_t tags[1];
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hb_ot_tags_from_script_and_language (HB_SCRIPT_UNKNOWN, language, nullptr, nullptr, &count, tags);
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return count > 0 ? tags[0] : HB_OT_TAG_DEFAULT_LANGUAGE;
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}
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#endif
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static void
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hb_ot_tags_from_language (const char *lang_str,
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const char *limit,
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unsigned int *count,
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hb_tag_t *tags)
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{
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const char *s;
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unsigned int tag_idx;
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/* Check for matches of multiple subtags. */
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if (hb_ot_tags_from_complex_language (lang_str, limit, count, tags))
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return;
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/* Find a language matching in the first component. */
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s = strchr (lang_str, '-');
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{
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if (s && limit - lang_str >= 6)
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{
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const char *extlang_end = strchr (s + 1, '-');
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/* If there is an extended language tag, use it. */
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if (3 == (extlang_end ? extlang_end - s - 1 : strlen (s + 1)) &&
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ISALPHA (s[1]))
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lang_str = s + 1;
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}
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if (hb_sorted_array (ot_languages).bfind (lang_str, &tag_idx))
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{
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unsigned int i;
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while (tag_idx != 0 &&
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0 == strcmp (ot_languages[tag_idx].language, ot_languages[tag_idx - 1].language))
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tag_idx--;
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for (i = 0;
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i < *count &&
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tag_idx + i < ARRAY_LENGTH (ot_languages) &&
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ot_languages[tag_idx + i].tag != HB_TAG_NONE &&
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0 == strcmp (ot_languages[tag_idx + i].language, ot_languages[tag_idx].language);
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i++)
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tags[i] = ot_languages[tag_idx + i].tag;
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*count = i;
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return;
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}
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}
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if (!s)
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s = lang_str + strlen (lang_str);
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if (s - lang_str == 3) {
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/* Assume it's ISO-639-3 and upper-case and use it. */
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tags[0] = hb_tag_from_string (lang_str, s - lang_str) & ~0x20202000u;
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*count = 1;
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return;
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}
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*count = 0;
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}
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static bool
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parse_private_use_subtag (const char *private_use_subtag,
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unsigned int *count,
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hb_tag_t *tags,
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const char *prefix,
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unsigned char (*normalize) (unsigned char))
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{
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#ifdef HB_NO_LANGUAGE_PRIVATE_SUBTAG
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return false;
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#endif
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if (!(private_use_subtag && count && tags && *count)) return false;
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const char *s = strstr (private_use_subtag, prefix);
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if (!s) return false;
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char tag[4];
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int i;
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s += strlen (prefix);
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if (s[0] == '-') {
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s += 1;
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char c;
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for (i = 0; i < 8 && ISHEX (s[i]); i++)
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{
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c = FROMHEX (s[i]);
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if (i % 2 == 0)
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tag[i / 2] = c << 4;
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else
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tag[i / 2] += c;
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}
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if (i != 8) return false;
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} else {
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for (i = 0; i < 4 && ISALNUM (s[i]); i++)
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tag[i] = normalize (s[i]);
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if (!i) return false;
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for (; i < 4; i++)
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tag[i] = ' ';
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}
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tags[0] = HB_TAG (tag[0], tag[1], tag[2], tag[3]);
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if ((tags[0] & 0xDFDFDFDF) == HB_OT_TAG_DEFAULT_SCRIPT)
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tags[0] ^= ~0xDFDFDFDF;
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*count = 1;
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return true;
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}
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/**
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* hb_ot_tags_from_script_and_language:
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* @script: an #hb_script_t to convert.
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* @language: an #hb_language_t to convert.
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* @script_count: (inout) (optional): maximum number of script tags to retrieve (IN)
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* and actual number of script tags retrieved (OUT)
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* @script_tags: (out) (optional): array of size at least @script_count to store the
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* script tag results
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* @language_count: (inout) (optional): maximum number of language tags to retrieve
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* (IN) and actual number of language tags retrieved (OUT)
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* @language_tags: (out) (optional): array of size at least @language_count to store
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* the language tag results
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*
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* Converts an #hb_script_t and an #hb_language_t to script and language tags.
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*
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* Since: 2.0.0
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**/
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void
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hb_ot_tags_from_script_and_language (hb_script_t script,
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hb_language_t language,
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unsigned int *script_count /* IN/OUT */,
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hb_tag_t *script_tags /* OUT */,
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unsigned int *language_count /* IN/OUT */,
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hb_tag_t *language_tags /* OUT */)
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{
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bool needs_script = true;
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if (language == HB_LANGUAGE_INVALID)
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{
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if (language_count && language_tags && *language_count)
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*language_count = 0;
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}
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else
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{
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const char *lang_str, *s, *limit, *private_use_subtag;
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bool needs_language;
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lang_str = hb_language_to_string (language);
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limit = nullptr;
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private_use_subtag = nullptr;
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if (lang_str[0] == 'x' && lang_str[1] == '-')
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{
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private_use_subtag = lang_str;
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} else {
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for (s = lang_str + 1; *s; s++)
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{
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if (s[-1] == '-' && s[1] == '-')
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{
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if (s[0] == 'x')
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{
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private_use_subtag = s;
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if (!limit)
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limit = s - 1;
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break;
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} else if (!limit)
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{
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limit = s - 1;
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}
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}
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}
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if (!limit)
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limit = s;
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}
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needs_script = !parse_private_use_subtag (private_use_subtag, script_count, script_tags, "-hbsc", TOLOWER);
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needs_language = !parse_private_use_subtag (private_use_subtag, language_count, language_tags, "-hbot", TOUPPER);
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if (needs_language && language_count && language_tags && *language_count)
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hb_ot_tags_from_language (lang_str, limit, language_count, language_tags);
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}
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if (needs_script && script_count && script_tags && *script_count)
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hb_ot_all_tags_from_script (script, script_count, script_tags);
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}
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/**
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* hb_ot_tag_to_language:
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* @tag: an language tag
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*
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* Converts a language tag to an #hb_language_t.
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*
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* Return value: (transfer none) (nullable):
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* The #hb_language_t corresponding to @tag.
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*
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* Since: 0.9.2
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**/
|
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hb_language_t
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hb_ot_tag_to_language (hb_tag_t tag)
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{
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unsigned int i;
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if (tag == HB_OT_TAG_DEFAULT_LANGUAGE)
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return nullptr;
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{
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hb_language_t disambiguated_tag = hb_ot_ambiguous_tag_to_language (tag);
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if (disambiguated_tag != HB_LANGUAGE_INVALID)
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return disambiguated_tag;
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}
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for (i = 0; i < ARRAY_LENGTH (ot_languages); i++)
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if (ot_languages[i].tag == tag)
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return hb_language_from_string (ot_languages[i].language, -1);
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|
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/* Return a custom language in the form of "x-hbot-AABBCCDD".
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* If it's three letters long, also guess it's ISO 639-3 and lower-case and
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* prepend it (if it's not a registered tag, the private use subtags will
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* ensure that calling hb_ot_tag_from_language on the result will still return
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* the same tag as the original tag).
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*/
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{
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char buf[20];
|
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char *str = buf;
|
|
if (ISALPHA (tag >> 24)
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&& ISALPHA ((tag >> 16) & 0xFF)
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&& ISALPHA ((tag >> 8) & 0xFF)
|
|
&& (tag & 0xFF) == ' ')
|
|
{
|
|
buf[0] = TOLOWER (tag >> 24);
|
|
buf[1] = TOLOWER ((tag >> 16) & 0xFF);
|
|
buf[2] = TOLOWER ((tag >> 8) & 0xFF);
|
|
buf[3] = '-';
|
|
str += 4;
|
|
}
|
|
snprintf (str, 16, "x-hbot-%08x", tag);
|
|
return hb_language_from_string (&*buf, -1);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* hb_ot_tags_to_script_and_language:
|
|
* @script_tag: a script tag
|
|
* @language_tag: a language tag
|
|
* @script: (out) (optional): the #hb_script_t corresponding to @script_tag.
|
|
* @language: (out) (optional): the #hb_language_t corresponding to @script_tag and
|
|
* @language_tag.
|
|
*
|
|
* Converts a script tag and a language tag to an #hb_script_t and an
|
|
* #hb_language_t.
|
|
*
|
|
* Since: 2.0.0
|
|
**/
|
|
void
|
|
hb_ot_tags_to_script_and_language (hb_tag_t script_tag,
|
|
hb_tag_t language_tag,
|
|
hb_script_t *script /* OUT */,
|
|
hb_language_t *language /* OUT */)
|
|
{
|
|
hb_script_t script_out = hb_ot_tag_to_script (script_tag);
|
|
if (script)
|
|
*script = script_out;
|
|
if (language)
|
|
{
|
|
unsigned int script_count = 1;
|
|
hb_tag_t primary_script_tag[1];
|
|
hb_ot_tags_from_script_and_language (script_out,
|
|
HB_LANGUAGE_INVALID,
|
|
&script_count,
|
|
primary_script_tag,
|
|
nullptr, nullptr);
|
|
*language = hb_ot_tag_to_language (language_tag);
|
|
if (script_count == 0 || primary_script_tag[0] != script_tag)
|
|
{
|
|
unsigned char *buf;
|
|
const char *lang_str = hb_language_to_string (*language);
|
|
size_t len = strlen (lang_str);
|
|
buf = (unsigned char *) hb_malloc (len + 16);
|
|
if (unlikely (!buf))
|
|
{
|
|
*language = nullptr;
|
|
}
|
|
else
|
|
{
|
|
int shift;
|
|
memcpy (buf, lang_str, len);
|
|
if (lang_str[0] != 'x' || lang_str[1] != '-') {
|
|
buf[len++] = '-';
|
|
buf[len++] = 'x';
|
|
}
|
|
buf[len++] = '-';
|
|
buf[len++] = 'h';
|
|
buf[len++] = 'b';
|
|
buf[len++] = 's';
|
|
buf[len++] = 'c';
|
|
buf[len++] = '-';
|
|
for (shift = 28; shift >= 0; shift -= 4)
|
|
buf[len++] = TOHEX (script_tag >> shift);
|
|
*language = hb_language_from_string ((char *) buf, len);
|
|
hb_free (buf);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef MAIN
|
|
static inline void
|
|
test_langs_sorted ()
|
|
{
|
|
for (unsigned int i = 1; i < ARRAY_LENGTH (ot_languages); i++)
|
|
{
|
|
int c = ot_languages[i].cmp (&ot_languages[i - 1]);
|
|
if (c > 0)
|
|
{
|
|
fprintf (stderr, "ot_languages not sorted at index %d: %s %d %s\n",
|
|
i, ot_languages[i-1].language, c, ot_languages[i].language);
|
|
abort();
|
|
}
|
|
}
|
|
}
|
|
|
|
int
|
|
main ()
|
|
{
|
|
test_langs_sorted ();
|
|
return 0;
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
#endif
|