JDK14/Java14源码在线阅读
/*
* Copyright 漏 2009 Red Hat, Inc.
* Copyright 漏 2011 Google, Inc.
*
* This is part of HarfBuzz, a text shaping library.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* Red Hat Author(s): Behdad Esfahbod
* Google Author(s): Behdad Esfahbod, Roozbeh Pournader
*/
#include "hb.hh"
/* hb_script_t */
static hb_tag_t
hb_ot_old_tag_from_script (hb_script_t script)
{
/* This seems to be accurate as of end of 2012. */
switch ((hb_tag_t) script)
{
case HB_SCRIPT_INVALID: return HB_OT_TAG_DEFAULT_SCRIPT;
/* KATAKANA and HIRAGANA both map to 'kana' */
case HB_SCRIPT_HIRAGANA: return HB_TAG('k','a','n','a');
/* Spaces at the end are preserved, unlike ISO 15924 */
case HB_SCRIPT_LAO: return HB_TAG('l','a','o',' ');
case HB_SCRIPT_YI: return HB_TAG('y','i',' ',' ');
/* Unicode-5.0 additions */
case HB_SCRIPT_NKO: return HB_TAG('n','k','o',' ');
/* Unicode-5.1 additions */
case HB_SCRIPT_VAI: return HB_TAG('v','a','i',' ');
}
/* Else, just change first char to lowercase and return */
return ((hb_tag_t) script) | 0x20000000u;
}
static hb_script_t
hb_ot_old_tag_to_script (hb_tag_t tag)
{
if (unlikely (tag == HB_OT_TAG_DEFAULT_SCRIPT))
return HB_SCRIPT_INVALID;
/* This side of the conversion is fully algorithmic. */
/* Any spaces at the end of the tag are replaced by repeating the last
* letter. Eg 'nko ' -> 'Nkoo' */
if (unlikely ((tag & 0x0000FF00u) == 0x00002000u))
tag |= (tag >> 8) & 0x0000FF00u; /* Copy second letter to third */
if (unlikely ((tag & 0x000000FFu) == 0x00000020u))
tag |= (tag >> 8) & 0x000000FFu; /* Copy third letter to fourth */
/* Change first char to uppercase and return */
return (hb_script_t) (tag & ~0x20000000u);
}
static hb_tag_t
hb_ot_new_tag_from_script (hb_script_t script)
{
switch ((hb_tag_t) script) {
case HB_SCRIPT_BENGALI: return HB_TAG('b','n','g','2');
case HB_SCRIPT_DEVANAGARI: return HB_TAG('d','e','v','2');
case HB_SCRIPT_GUJARATI: return HB_TAG('g','j','r','2');
case HB_SCRIPT_GURMUKHI: return HB_TAG('g','u','r','2');
case HB_SCRIPT_KANNADA: return HB_TAG('k','n','d','2');
case HB_SCRIPT_MALAYALAM: return HB_TAG('m','l','m','2');
case HB_SCRIPT_ORIYA: return HB_TAG('o','r','y','2');
case HB_SCRIPT_TAMIL: return HB_TAG('t','m','l','2');
case HB_SCRIPT_TELUGU: return HB_TAG('t','e','l','2');
case HB_SCRIPT_MYANMAR: return HB_TAG('m','y','m','2');
}
return HB_OT_TAG_DEFAULT_SCRIPT;
}
static hb_script_t
hb_ot_new_tag_to_script (hb_tag_t tag)
{
switch (tag) {
case HB_TAG('b','n','g','2'): return HB_SCRIPT_BENGALI;
case HB_TAG('d','e','v','2'): return HB_SCRIPT_DEVANAGARI;
case HB_TAG('g','j','r','2'): return HB_SCRIPT_GUJARATI;
case HB_TAG('g','u','r','2'): return HB_SCRIPT_GURMUKHI;
case HB_TAG('k','n','d','2'): return HB_SCRIPT_KANNADA;
case HB_TAG('m','l','m','2'): return HB_SCRIPT_MALAYALAM;
case HB_TAG('o','r','y','2'): return HB_SCRIPT_ORIYA;
case HB_TAG('t','m','l','2'): return HB_SCRIPT_TAMIL;
case HB_TAG('t','e','l','2'): return HB_SCRIPT_TELUGU;
case HB_TAG('m','y','m','2'): return HB_SCRIPT_MYANMAR;
}
return HB_SCRIPT_UNKNOWN;
}
void
hb_ot_tags_from_script (hb_script_t script,
hb_tag_t *script_tag_1,
hb_tag_t *script_tag_2)
{
unsigned int count = 2;
hb_tag_t tags[2];
hb_ot_tags_from_script_and_language (script, HB_LANGUAGE_INVALID, &count, tags, nullptr, nullptr);
*script_tag_1 = count > 0 ? tags[0] : HB_OT_TAG_DEFAULT_SCRIPT;
*script_tag_2 = count > 1 ? tags[1] : HB_OT_TAG_DEFAULT_SCRIPT;
}
/*
* Complete list at:
* https://docs.microsoft.com/en-us/typography/opentype/spec/scripttags
*
* Most of the script tags are the same as the ISO 15924 tag but lowercased.
* So we just do that, and handle the exceptional cases in a switch.
*/
static void
hb_ot_all_tags_from_script (hb_script_t script,
unsigned int *count /* IN/OUT */,
hb_tag_t *tags /* OUT */)
{
unsigned int i = 0;
hb_tag_t new_tag = hb_ot_new_tag_from_script (script);
if (unlikely (new_tag != HB_OT_TAG_DEFAULT_SCRIPT))
{
tags[i++] = new_tag | '3';
if (*count > i)
tags[i++] = new_tag;
}
if (*count > i)
{
hb_tag_t old_tag = hb_ot_old_tag_from_script (script);
if (old_tag != HB_OT_TAG_DEFAULT_SCRIPT)
tags[i++] = old_tag;
}
*count = i;
}
hb_script_t
hb_ot_tag_to_script (hb_tag_t tag)
{
unsigned char digit = tag & 0x000000FFu;
if (unlikely (digit == '2' || digit == '3'))
return hb_ot_new_tag_to_script (tag & 0xFFFFFF32);
return hb_ot_old_tag_to_script (tag);
}
/* hb_language_t */
static int
lang_compare_first_component (const void *pa,
const void *pb)
{
const char *a = (const char *) pa;
const char *b = (const char *) pb;
unsigned int da, db;
const char *p;
p = strchr (a, '-');
da = p ? (unsigned int) (p - a) : strlen (a);
p = strchr (b, '-');
db = p ? (unsigned int) (p - b) : strlen (b);
return strncmp (a, b, MAX (da, db));
}
static bool
subtag_matches (const char *lang_str,
const char *limit,
const char *subtag)
{
do {
const char *s = strstr (lang_str, subtag);
if (!s || s >= limit)
return false;
if (!ISALNUM (s[strlen (subtag)]))
return true;
lang_str = s + strlen (subtag);
} while (true);
}
static hb_bool_t
lang_matches (const char *lang_str, const char *spec)
{
unsigned int len = strlen (spec);
return strncmp (lang_str, spec, len) == 0 &&
(lang_str[len] == '\0' || lang_str[len] == '-');
}
typedef struct {
char language[4];
hb_tag_t tags[HB_OT_MAX_TAGS_PER_LANGUAGE];
} LangTag;
#include "hb-ot-tag-table.hh"
/* The corresponding languages IDs for the following IDs are unclear,
* overlap, or are architecturally weird. Needs more research. */
/*{"??", {HB_TAG('B','C','R',' ')}},*/ /* Bible Cree */
/*{"zh?", {HB_TAG('C','H','N',' ')}},*/ /* Chinese (seen in Microsoft fonts) */
/*{"ar-Syrc?", {HB_TAG('G','A','R',' ')}},*/ /* Garshuni */
/*{"??", {HB_TAG('N','G','R',' ')}},*/ /* Nagari */
/*{"??", {HB_TAG('Y','I','C',' ')}},*/ /* Yi Classic */
/*{"zh?", {HB_TAG('Z','H','P',' ')}},*/ /* Chinese Phonetic */
hb_tag_t
hb_ot_tag_from_language (hb_language_t language)
{
unsigned int count = 1;
hb_tag_t tags[1];
hb_ot_tags_from_script_and_language (HB_SCRIPT_UNKNOWN, language, nullptr, nullptr, &count, tags);
return count > 0 ? tags[0] : HB_OT_TAG_DEFAULT_LANGUAGE;
}
static void
hb_ot_tags_from_language (const char *lang_str,
const char *limit,
unsigned int *count,
hb_tag_t *tags)
{
const char *s;
/* Check for matches of multiple subtags. */
if (hb_ot_tags_from_complex_language (lang_str, limit, count, tags))
return;
/* Find a language matching in the first component. */
s = strchr (lang_str, '-');
{
const LangTag *lang_tag;
if (s && limit - lang_str >= 6)
{
const char *extlang_end = strchr (s + 1, '-');
/* If there is an extended language tag, use it. */
if (3 == (extlang_end ? extlang_end - s - 1 : strlen (s + 1)) &&
ISALPHA (s[1]))
lang_str = s + 1;
}
lang_tag = (LangTag *) bsearch (lang_str, ot_languages,
ARRAY_LENGTH (ot_languages), sizeof (LangTag),
lang_compare_first_component);
if (lang_tag)
{
unsigned int i;
for (i = 0; i < *count && lang_tag->tags[i] != HB_TAG_NONE; i++)
tags[i] = lang_tag->tags[i];
*count = i;
return;
}
}
if (!s)
s = lang_str + strlen (lang_str);
if (s - lang_str == 3) {
/* Assume it's ISO-639-3 and upper-case and use it. */
tags[0] = hb_tag_from_string (lang_str, s - lang_str) & ~0x20202000u;
*count = 1;
return;
}
*count = 0;
}
static bool
parse_private_use_subtag (const char *private_use_subtag,
unsigned int *count,
hb_tag_t *tags,
const char *prefix,
unsigned char (*normalize) (unsigned char))
{
if (private_use_subtag && count && tags && *count)
{
const char *s = strstr (private_use_subtag, prefix);
if (s)
{
char tag[4];
int i;
s += strlen (prefix);
for (i = 0; i < 4 && ISALNUM (s[i]); i++)
tag[i] = normalize (s[i]);
if (i)
{
for (; i < 4; i++)
tag[i] = ' ';
tags[0] = HB_TAG (tag[0], tag[1], tag[2], tag[3]);
if ((tags[0] & 0xDFDFDFDF) == HB_OT_TAG_DEFAULT_SCRIPT)
tags[0] ^= ~0xDFDFDFDF;
*count = 1;
return false;
}
}
}
return true;
}
/**
* hb_ot_tags_from_script_and_language:
* @script: an #hb_script_t to convert.
* @language: an #hb_language_t to convert.
* @script_count: (allow-none): maximum number of script tags to retrieve (IN)
* and actual number of script tags retrieved (OUT)
* @script_tags: (out) (allow-none): array of size at least @script_count to store the
* script tag results
* @language_count: (allow-none): maximum number of language tags to retrieve
* (IN) and actual number of language tags retrieved (OUT)
* @language_tags: (out) (allow-none): array of size at least @language_count to store
* the language tag results
*
* Converts an #hb_script_t and an #hb_language_t to script and language tags.
*
* Since: 2.0.0
**/
void
hb_ot_tags_from_script_and_language (hb_script_t script,
hb_language_t language,
unsigned int *script_count /* IN/OUT */,
hb_tag_t *script_tags /* OUT */,
unsigned int *language_count /* IN/OUT */,
hb_tag_t *language_tags /* OUT */)
{
bool needs_script = true;
if (language == HB_LANGUAGE_INVALID)
{
if (language_count && language_tags && *language_count)
*language_count = 0;
}
else
{
const char *lang_str, *s, *limit, *private_use_subtag;
bool needs_language;
lang_str = hb_language_to_string (language);
limit = nullptr;
private_use_subtag = nullptr;
if (lang_str[0] == 'x' && lang_str[1] == '-')
{
private_use_subtag = lang_str;
} else {
for (s = lang_str + 1; *s; s++)
{
if (s[-1] == '-' && s[1] == '-')
{
if (s[0] == 'x')
{
private_use_subtag = s;
if (!limit)
limit = s - 1;
break;
} else if (!limit)
{
limit = s - 1;
}
}
}
if (!limit)
limit = s;
}
needs_script = parse_private_use_subtag (private_use_subtag, script_count, script_tags, "-hbsc", TOLOWER);
needs_language = parse_private_use_subtag (private_use_subtag, language_count, language_tags, "-hbot", TOUPPER);
if (needs_language && language_count && language_tags && *language_count)
hb_ot_tags_from_language (lang_str, limit, language_count, language_tags);
}
if (needs_script && script_count && script_tags && *script_count)
hb_ot_all_tags_from_script (script, script_count, script_tags);
}
/**
* hb_ot_tag_to_language:
*
*
*
* Return value: (transfer none):
*
* Since: 0.9.2
**/
hb_language_t
hb_ot_tag_to_language (hb_tag_t tag)
{
unsigned int i;
if (tag == HB_OT_TAG_DEFAULT_LANGUAGE)
return nullptr;
{
hb_language_t disambiguated_tag = hb_ot_ambiguous_tag_to_language (tag);
if (disambiguated_tag != HB_LANGUAGE_INVALID)
return disambiguated_tag;
}
for (i = 0; i < ARRAY_LENGTH (ot_languages); i++)
if (ot_languages[i].tags[0] == tag)
return hb_language_from_string (ot_languages[i].language, -1);
/* Else return a custom language in the form of "x-hbotABCD" */
{
unsigned char buf[11] = "x-hbot";
buf[6] = tag >> 24;
buf[7] = (tag >> 16) & 0xFF;
buf[8] = (tag >> 8) & 0xFF;
buf[9] = tag & 0xFF;
if (buf[9] == 0x20)
buf[9] = '\0';
buf[10] = '\0';
return hb_language_from_string ((char *) buf, -1);
}
}
/**
* hb_ot_tags_to_script_and_language:
* @script_tag: a script tag
* @language_tag: a language tag
* @script: (allow-none): the #hb_script_t corresponding to @script_tag (OUT).
* @language: (allow-none): the #hb_language_t corresponding to @script_tag and
* @language_tag (OUT).
*
* 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,
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