/* guniprop.c - Unicode character properties. * * Copyright (C) 1999 Tom Tromey * Copyright (C) 2000 Red Hat, Inc. * * This library 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 2 of the License, or (at your option) any later version. * * This library 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 library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #include "config.h" #include #include #include #include #include "gmem.h" #include "gstring.h" #include "gtestutils.h" #include "gtypes.h" #include "gunicode.h" #include "gunichartables.h" #include "gmirroringtable.h" #include "gscripttable.h" #include "gunicodeprivate.h" #ifdef G_OS_WIN32 #include "gwin32.h" #endif #define ATTR_TABLE(Page) (((Page) <= G_UNICODE_LAST_PAGE_PART1) \ ? attr_table_part1[Page] \ : attr_table_part2[(Page) - 0xe00]) #define ATTTABLE(Page, Char) \ ((ATTR_TABLE(Page) == G_UNICODE_MAX_TABLE_INDEX) ? 0 : (attr_data[ATTR_TABLE(Page)][Char])) #define TTYPE_PART1(Page, Char) \ ((type_table_part1[Page] >= G_UNICODE_MAX_TABLE_INDEX) \ ? (type_table_part1[Page] - G_UNICODE_MAX_TABLE_INDEX) \ : (type_data[type_table_part1[Page]][Char])) #define TTYPE_PART2(Page, Char) \ ((type_table_part2[Page] >= G_UNICODE_MAX_TABLE_INDEX) \ ? (type_table_part2[Page] - G_UNICODE_MAX_TABLE_INDEX) \ : (type_data[type_table_part2[Page]][Char])) #define TYPE(Char) \ (((Char) <= G_UNICODE_LAST_CHAR_PART1) \ ? TTYPE_PART1 ((Char) >> 8, (Char) & 0xff) \ : (((Char) >= 0xe0000 && (Char) <= G_UNICODE_LAST_CHAR) \ ? TTYPE_PART2 (((Char) - 0xe0000) >> 8, (Char) & 0xff) \ : G_UNICODE_UNASSIGNED)) #define IS(Type, Class) (((guint)1 << (Type)) & (Class)) #define OR(Type, Rest) (((guint)1 << (Type)) | (Rest)) #define ISALPHA(Type) IS ((Type), \ OR (G_UNICODE_LOWERCASE_LETTER, \ OR (G_UNICODE_UPPERCASE_LETTER, \ OR (G_UNICODE_TITLECASE_LETTER, \ OR (G_UNICODE_MODIFIER_LETTER, \ OR (G_UNICODE_OTHER_LETTER, 0)))))) #define ISALDIGIT(Type) IS ((Type), \ OR (G_UNICODE_DECIMAL_NUMBER, \ OR (G_UNICODE_LETTER_NUMBER, \ OR (G_UNICODE_OTHER_NUMBER, \ OR (G_UNICODE_LOWERCASE_LETTER, \ OR (G_UNICODE_UPPERCASE_LETTER, \ OR (G_UNICODE_TITLECASE_LETTER, \ OR (G_UNICODE_MODIFIER_LETTER, \ OR (G_UNICODE_OTHER_LETTER, 0))))))))) #define ISMARK(Type) IS ((Type), \ OR (G_UNICODE_NON_SPACING_MARK, \ OR (G_UNICODE_SPACING_MARK, \ OR (G_UNICODE_ENCLOSING_MARK, 0)))) #define ISZEROWIDTHTYPE(Type) IS ((Type), \ OR (G_UNICODE_NON_SPACING_MARK, \ OR (G_UNICODE_ENCLOSING_MARK, \ OR (G_UNICODE_FORMAT, 0)))) /** * g_unichar_isalnum: * @c: a Unicode character * * Determines whether a character is alphanumeric. * Given some UTF-8 text, obtain a character value * with g_utf8_get_char(). * * Return value: %TRUE if @c is an alphanumeric character **/ gboolean g_unichar_isalnum (gunichar c) { return ISALDIGIT (TYPE (c)) ? TRUE : FALSE; } /** * g_unichar_isalpha: * @c: a Unicode character * * Determines whether a character is alphabetic (i.e. a letter). * Given some UTF-8 text, obtain a character value with * g_utf8_get_char(). * * Return value: %TRUE if @c is an alphabetic character **/ gboolean g_unichar_isalpha (gunichar c) { return ISALPHA (TYPE (c)) ? TRUE : FALSE; } /** * g_unichar_iscntrl: * @c: a Unicode character * * Determines whether a character is a control character. * Given some UTF-8 text, obtain a character value with * g_utf8_get_char(). * * Return value: %TRUE if @c is a control character **/ gboolean g_unichar_iscntrl (gunichar c) { return TYPE (c) == G_UNICODE_CONTROL; } /** * g_unichar_isdigit: * @c: a Unicode character * * Determines whether a character is numeric (i.e. a digit). This * covers ASCII 0-9 and also digits in other languages/scripts. Given * some UTF-8 text, obtain a character value with g_utf8_get_char(). * * Return value: %TRUE if @c is a digit **/ gboolean g_unichar_isdigit (gunichar c) { return TYPE (c) == G_UNICODE_DECIMAL_NUMBER; } /** * g_unichar_isgraph: * @c: a Unicode character * * Determines whether a character is printable and not a space * (returns %FALSE for control characters, format characters, and * spaces). g_unichar_isprint() is similar, but returns %TRUE for * spaces. Given some UTF-8 text, obtain a character value with * g_utf8_get_char(). * * Return value: %TRUE if @c is printable unless it's a space **/ gboolean g_unichar_isgraph (gunichar c) { return !IS (TYPE(c), OR (G_UNICODE_CONTROL, OR (G_UNICODE_FORMAT, OR (G_UNICODE_UNASSIGNED, OR (G_UNICODE_SURROGATE, OR (G_UNICODE_SPACE_SEPARATOR, 0)))))); } /** * g_unichar_islower: * @c: a Unicode character * * Determines whether a character is a lowercase letter. * Given some UTF-8 text, obtain a character value with * g_utf8_get_char(). * * Return value: %TRUE if @c is a lowercase letter **/ gboolean g_unichar_islower (gunichar c) { return TYPE (c) == G_UNICODE_LOWERCASE_LETTER; } /** * g_unichar_isprint: * @c: a Unicode character * * Determines whether a character is printable. * Unlike g_unichar_isgraph(), returns %TRUE for spaces. * Given some UTF-8 text, obtain a character value with * g_utf8_get_char(). * * Return value: %TRUE if @c is printable **/ gboolean g_unichar_isprint (gunichar c) { return !IS (TYPE(c), OR (G_UNICODE_CONTROL, OR (G_UNICODE_FORMAT, OR (G_UNICODE_UNASSIGNED, OR (G_UNICODE_SURROGATE, 0))))); } /** * g_unichar_ispunct: * @c: a Unicode character * * Determines whether a character is punctuation or a symbol. * Given some UTF-8 text, obtain a character value with * g_utf8_get_char(). * * Return value: %TRUE if @c is a punctuation or symbol character **/ gboolean g_unichar_ispunct (gunichar c) { return IS (TYPE(c), OR (G_UNICODE_CONNECT_PUNCTUATION, OR (G_UNICODE_DASH_PUNCTUATION, OR (G_UNICODE_CLOSE_PUNCTUATION, OR (G_UNICODE_FINAL_PUNCTUATION, OR (G_UNICODE_INITIAL_PUNCTUATION, OR (G_UNICODE_OTHER_PUNCTUATION, OR (G_UNICODE_OPEN_PUNCTUATION, OR (G_UNICODE_CURRENCY_SYMBOL, OR (G_UNICODE_MODIFIER_SYMBOL, OR (G_UNICODE_MATH_SYMBOL, OR (G_UNICODE_OTHER_SYMBOL, 0)))))))))))) ? TRUE : FALSE; } /** * g_unichar_isspace: * @c: a Unicode character * * Determines whether a character is a space, tab, or line separator * (newline, carriage return, etc.). Given some UTF-8 text, obtain a * character value with g_utf8_get_char(). * * (Note: don't use this to do word breaking; you have to use * Pango or equivalent to get word breaking right, the algorithm * is fairly complex.) * * Return value: %TRUE if @c is a space character **/ gboolean g_unichar_isspace (gunichar c) { switch (c) { /* special-case these since Unicode thinks they are not spaces */ case '\t': case '\n': case '\r': case '\f': return TRUE; break; default: { return IS (TYPE(c), OR (G_UNICODE_SPACE_SEPARATOR, OR (G_UNICODE_LINE_SEPARATOR, OR (G_UNICODE_PARAGRAPH_SEPARATOR, 0)))) ? TRUE : FALSE; } break; } } /** * g_unichar_ismark: * @c: a Unicode character * * Determines whether a character is a mark (non-spacing mark, * combining mark, or enclosing mark in Unicode speak). * Given some UTF-8 text, obtain a character value * with g_utf8_get_char(). * * Note: in most cases where isalpha characters are allowed, * ismark characters should be allowed to as they are essential * for writing most European languages as well as many non-Latin * scripts. * * Return value: %TRUE if @c is a mark character * * Since: 2.14 **/ gboolean g_unichar_ismark (gunichar c) { return ISMARK (TYPE (c)); } /** * g_unichar_isupper: * @c: a Unicode character * * Determines if a character is uppercase. * * Return value: %TRUE if @c is an uppercase character **/ gboolean g_unichar_isupper (gunichar c) { return TYPE (c) == G_UNICODE_UPPERCASE_LETTER; } /** * g_unichar_istitle: * @c: a Unicode character * * Determines if a character is titlecase. Some characters in * Unicode which are composites, such as the DZ digraph * have three case variants instead of just two. The titlecase * form is used at the beginning of a word where only the * first letter is capitalized. The titlecase form of the DZ * digraph is U+01F2 LATIN CAPITAL LETTTER D WITH SMALL LETTER Z. * * Return value: %TRUE if the character is titlecase **/ gboolean g_unichar_istitle (gunichar c) { unsigned int i; for (i = 0; i < G_N_ELEMENTS (title_table); ++i) if (title_table[i][0] == c) return TRUE; return FALSE; } /** * g_unichar_isxdigit: * @c: a Unicode character. * * Determines if a character is a hexidecimal digit. * * Return value: %TRUE if the character is a hexadecimal digit **/ gboolean g_unichar_isxdigit (gunichar c) { return ((c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F') || (TYPE (c) == G_UNICODE_DECIMAL_NUMBER)); } /** * g_unichar_isdefined: * @c: a Unicode character * * Determines if a given character is assigned in the Unicode * standard. * * Return value: %TRUE if the character has an assigned value **/ gboolean g_unichar_isdefined (gunichar c) { return !IS (TYPE(c), OR (G_UNICODE_UNASSIGNED, OR (G_UNICODE_SURROGATE, 0))); } /** * g_unichar_iszerowidth: * @c: a Unicode character * * Determines if a given character typically takes zero width when rendered. * The return value is %TRUE for all non-spacing and enclosing marks * (e.g., combining accents), format characters, zero-width * space, but not U+00AD SOFT HYPHEN. * * A typical use of this function is with one of g_unichar_iswide() or * g_unichar_iswide_cjk() to determine the number of cells a string occupies * when displayed on a grid display (terminals). However, note that not all * terminals support zero-width rendering of zero-width marks. * * Return value: %TRUE if the character has zero width * * Since: 2.14 **/ gboolean g_unichar_iszerowidth (gunichar c) { if (G_UNLIKELY (c == 0x00AD)) return FALSE; if (G_UNLIKELY (ISZEROWIDTHTYPE (TYPE (c)))) return TRUE; if (G_UNLIKELY ((c >= 0x1160 && c < 0x1200) || c == 0x200B)) return TRUE; return FALSE; } struct Interval { gunichar start, end; }; static int interval_compare (const void *key, const void *elt) { gunichar c = GPOINTER_TO_UINT (key); struct Interval *interval = (struct Interval *)elt; if (c < interval->start) return -1; if (c > interval->end) return +1; return 0; } /* * NOTE: * * The tables for g_unichar_iswide() and g_unichar_iswide_cjk() are * generated from the Unicode Character Database's file * extracted/DerivedEastAsianWidth.txt using the gen-iswide-table.py * in this way: * * ./gen-iswide-table.py < path/to/ucd/extracted/DerivedEastAsianWidth.txt | fmt * * Last update for Unicode 6.0. */ /** * g_unichar_iswide: * @c: a Unicode character * * Determines if a character is typically rendered in a double-width * cell. * * Return value: %TRUE if the character is wide **/ gboolean g_unichar_iswide (gunichar c) { /* See NOTE earlier for how to update this table. */ static const struct Interval wide[] = { {0x1100, 0x115F}, {0x11A3, 0x11A7}, {0x11FA, 0x11FF}, {0x2329, 0x232A}, {0x2E80, 0x2E99}, {0x2E9B, 0x2EF3}, {0x2F00, 0x2FD5}, {0x2FF0, 0x2FFB}, {0x3000, 0x303E}, {0x3041, 0x3096}, {0x3099, 0x30FF}, {0x3105, 0x312D}, {0x3131, 0x318E}, {0x3190, 0x31BA}, {0x31C0, 0x31E3}, {0x31F0, 0x321E}, {0x3220, 0x3247}, {0x3250, 0x32FE}, {0x3300, 0x4DBF}, {0x4E00, 0xA48C}, {0xA490, 0xA4C6}, {0xA960, 0xA97C}, {0xAC00, 0xD7A3}, {0xD7B0, 0xD7C6}, {0xD7CB, 0xD7FB}, {0xF900, 0xFAFF}, {0xFE10, 0xFE19}, {0xFE30, 0xFE52}, {0xFE54, 0xFE66}, {0xFE68, 0xFE6B}, {0xFF01, 0xFF60}, {0xFFE0, 0xFFE6}, {0x1B000, 0x1B001}, {0x1F200, 0x1F202}, {0x1F210, 0x1F23A}, {0x1F240, 0x1F248}, {0x1F250, 0x1F251}, {0x20000, 0x2FFFD}, {0x30000, 0x3FFFD} }; if (bsearch (GUINT_TO_POINTER (c), wide, G_N_ELEMENTS (wide), sizeof wide[0], interval_compare)) return TRUE; return FALSE; } /** * g_unichar_iswide_cjk: * @c: a Unicode character * * Determines if a character is typically rendered in a double-width * cell under legacy East Asian locales. If a character is wide according to * g_unichar_iswide(), then it is also reported wide with this function, but * the converse is not necessarily true. See the * Unicode Standard * Annex #11 for details. * * If a character passes the g_unichar_iswide() test then it will also pass * this test, but not the other way around. Note that some characters may * pas both this test and g_unichar_iszerowidth(). * * Return value: %TRUE if the character is wide in legacy East Asian locales * * Since: 2.12 */ gboolean g_unichar_iswide_cjk (gunichar c) { /* See NOTE earlier for how to update this table. */ static const struct Interval ambiguous[] = { {0x00A1, 0x00A1}, {0x00A4, 0x00A4}, {0x00A7, 0x00A8}, {0x00AA, 0x00AA}, {0x00AD, 0x00AE}, {0x00B0, 0x00B4}, {0x00B6, 0x00BA}, {0x00BC, 0x00BF}, {0x00C6, 0x00C6}, {0x00D0, 0x00D0}, {0x00D7, 0x00D8}, {0x00DE, 0x00E1}, {0x00E6, 0x00E6}, {0x00E8, 0x00EA}, {0x00EC, 0x00ED}, {0x00F0, 0x00F0}, {0x00F2, 0x00F3}, {0x00F7, 0x00FA}, {0x00FC, 0x00FC}, {0x00FE, 0x00FE}, {0x0101, 0x0101}, {0x0111, 0x0111}, {0x0113, 0x0113}, {0x011B, 0x011B}, {0x0126, 0x0127}, {0x012B, 0x012B}, {0x0131, 0x0133}, {0x0138, 0x0138}, {0x013F, 0x0142}, {0x0144, 0x0144}, {0x0148, 0x014B}, {0x014D, 0x014D}, {0x0152, 0x0153}, {0x0166, 0x0167}, {0x016B, 0x016B}, {0x01CE, 0x01CE}, {0x01D0, 0x01D0}, {0x01D2, 0x01D2}, {0x01D4, 0x01D4}, {0x01D6, 0x01D6}, {0x01D8, 0x01D8}, {0x01DA, 0x01DA}, {0x01DC, 0x01DC}, {0x0251, 0x0251}, {0x0261, 0x0261}, {0x02C4, 0x02C4}, {0x02C7, 0x02C7}, {0x02C9, 0x02CB}, {0x02CD, 0x02CD}, {0x02D0, 0x02D0}, {0x02D8, 0x02DB}, {0x02DD, 0x02DD}, {0x02DF, 0x02DF}, {0x0300, 0x036F}, {0x0391, 0x03A1}, {0x03A3, 0x03A9}, {0x03B1, 0x03C1}, {0x03C3, 0x03C9}, {0x0401, 0x0401}, {0x0410, 0x044F}, {0x0451, 0x0451}, {0x2010, 0x2010}, {0x2013, 0x2016}, {0x2018, 0x2019}, {0x201C, 0x201D}, {0x2020, 0x2022}, {0x2024, 0x2027}, {0x2030, 0x2030}, {0x2032, 0x2033}, {0x2035, 0x2035}, {0x203B, 0x203B}, {0x203E, 0x203E}, {0x2074, 0x2074}, {0x207F, 0x207F}, {0x2081, 0x2084}, {0x20AC, 0x20AC}, {0x2103, 0x2103}, {0x2105, 0x2105}, {0x2109, 0x2109}, {0x2113, 0x2113}, {0x2116, 0x2116}, {0x2121, 0x2122}, {0x2126, 0x2126}, {0x212B, 0x212B}, {0x2153, 0x2154}, {0x215B, 0x215E}, {0x2160, 0x216B}, {0x2170, 0x2179}, {0x2189, 0x2189}, {0x2190, 0x2199}, {0x21B8, 0x21B9}, {0x21D2, 0x21D2}, {0x21D4, 0x21D4}, {0x21E7, 0x21E7}, {0x2200, 0x2200}, {0x2202, 0x2203}, {0x2207, 0x2208}, {0x220B, 0x220B}, {0x220F, 0x220F}, {0x2211, 0x2211}, {0x2215, 0x2215}, {0x221A, 0x221A}, {0x221D, 0x2220}, {0x2223, 0x2223}, {0x2225, 0x2225}, {0x2227, 0x222C}, {0x222E, 0x222E}, {0x2234, 0x2237}, {0x223C, 0x223D}, {0x2248, 0x2248}, {0x224C, 0x224C}, {0x2252, 0x2252}, {0x2260, 0x2261}, {0x2264, 0x2267}, {0x226A, 0x226B}, {0x226E, 0x226F}, {0x2282, 0x2283}, {0x2286, 0x2287}, {0x2295, 0x2295}, {0x2299, 0x2299}, {0x22A5, 0x22A5}, {0x22BF, 0x22BF}, {0x2312, 0x2312}, {0x2460, 0x24E9}, {0x24EB, 0x254B}, {0x2550, 0x2573}, {0x2580, 0x258F}, {0x2592, 0x2595}, {0x25A0, 0x25A1}, {0x25A3, 0x25A9}, {0x25B2, 0x25B3}, {0x25B6, 0x25B7}, {0x25BC, 0x25BD}, {0x25C0, 0x25C1}, {0x25C6, 0x25C8}, {0x25CB, 0x25CB}, {0x25CE, 0x25D1}, {0x25E2, 0x25E5}, {0x25EF, 0x25EF}, {0x2605, 0x2606}, {0x2609, 0x2609}, {0x260E, 0x260F}, {0x2614, 0x2615}, {0x261C, 0x261C}, {0x261E, 0x261E}, {0x2640, 0x2640}, {0x2642, 0x2642}, {0x2660, 0x2661}, {0x2663, 0x2665}, {0x2667, 0x266A}, {0x266C, 0x266D}, {0x266F, 0x266F}, {0x269E, 0x269F}, {0x26BE, 0x26BF}, {0x26C4, 0x26CD}, {0x26CF, 0x26E1}, {0x26E3, 0x26E3}, {0x26E8, 0x26FF}, {0x273D, 0x273D}, {0x2757, 0x2757}, {0x2776, 0x277F}, {0x2B55, 0x2B59}, {0x3248, 0x324F}, {0xE000, 0xF8FF}, {0xFE00, 0xFE0F}, {0xFFFD, 0xFFFD}, {0x1F100, 0x1F10A}, {0x1F110, 0x1F12D}, {0x1F130, 0x1F169}, {0x1F170, 0x1F19A}, {0xE0100, 0xE01EF}, {0xF0000, 0xFFFFD}, {0x100000, 0x10FFFD} }; if (g_unichar_iswide (c)) return TRUE; if (bsearch (GUINT_TO_POINTER (c), ambiguous, G_N_ELEMENTS (ambiguous), sizeof ambiguous[0], interval_compare)) return TRUE; return FALSE; } /** * g_unichar_toupper: * @c: a Unicode character * * Converts a character to uppercase. * * Return value: the result of converting @c to uppercase. * If @c is not an lowercase or titlecase character, * or has no upper case equivalent @c is returned unchanged. **/ gunichar g_unichar_toupper (gunichar c) { int t = TYPE (c); if (t == G_UNICODE_LOWERCASE_LETTER) { gunichar val = ATTTABLE (c >> 8, c & 0xff); if (val >= 0x1000000) { const gchar *p = special_case_table + val - 0x1000000; val = g_utf8_get_char (p); } /* Some lowercase letters, e.g., U+000AA, FEMININE ORDINAL INDICATOR, * do not have an uppercase equivalent, in which case val will be * zero. */ return val ? val : c; } else if (t == G_UNICODE_TITLECASE_LETTER) { unsigned int i; for (i = 0; i < G_N_ELEMENTS (title_table); ++i) { if (title_table[i][0] == c) return title_table[i][1] ? title_table[i][1] : c; } } return c; } /** * g_unichar_tolower: * @c: a Unicode character. * * Converts a character to lower case. * * Return value: the result of converting @c to lower case. * If @c is not an upperlower or titlecase character, * or has no lowercase equivalent @c is returned unchanged. **/ gunichar g_unichar_tolower (gunichar c) { int t = TYPE (c); if (t == G_UNICODE_UPPERCASE_LETTER) { gunichar val = ATTTABLE (c >> 8, c & 0xff); if (val >= 0x1000000) { const gchar *p = special_case_table + val - 0x1000000; return g_utf8_get_char (p); } else { /* Not all uppercase letters are guaranteed to have a lowercase * equivalent. If this is the case, val will be zero. */ return val ? val : c; } } else if (t == G_UNICODE_TITLECASE_LETTER) { unsigned int i; for (i = 0; i < G_N_ELEMENTS (title_table); ++i) { if (title_table[i][0] == c) return title_table[i][2]; } } return c; } /** * g_unichar_totitle: * @c: a Unicode character * * Converts a character to the titlecase. * * Return value: the result of converting @c to titlecase. * If @c is not an uppercase or lowercase character, * @c is returned unchanged. **/ gunichar g_unichar_totitle (gunichar c) { unsigned int i; for (i = 0; i < G_N_ELEMENTS (title_table); ++i) { if (title_table[i][0] == c || title_table[i][1] == c || title_table[i][2] == c) return title_table[i][0]; } if (TYPE (c) == G_UNICODE_LOWERCASE_LETTER) return g_unichar_toupper (c); return c; } /** * g_unichar_digit_value: * @c: a Unicode character * * Determines the numeric value of a character as a decimal * digit. * * Return value: If @c is a decimal digit (according to * g_unichar_isdigit()), its numeric value. Otherwise, -1. **/ int g_unichar_digit_value (gunichar c) { if (TYPE (c) == G_UNICODE_DECIMAL_NUMBER) return ATTTABLE (c >> 8, c & 0xff); return -1; } /** * g_unichar_xdigit_value: * @c: a Unicode character * * Determines the numeric value of a character as a hexidecimal * digit. * * Return value: If @c is a hex digit (according to * g_unichar_isxdigit()), its numeric value. Otherwise, -1. **/ int g_unichar_xdigit_value (gunichar c) { if (c >= 'A' && c <= 'F') return c - 'A' + 10; if (c >= 'a' && c <= 'f') return c - 'a' + 10; if (TYPE (c) == G_UNICODE_DECIMAL_NUMBER) return ATTTABLE (c >> 8, c & 0xff); return -1; } /** * g_unichar_type: * @c: a Unicode character * * Classifies a Unicode character by type. * * Return value: the type of the character. **/ GUnicodeType g_unichar_type (gunichar c) { return TYPE (c); } /* * Case mapping functions */ typedef enum { LOCALE_NORMAL, LOCALE_TURKIC, LOCALE_LITHUANIAN } LocaleType; static LocaleType get_locale_type (void) { #ifdef G_OS_WIN32 char *tem = g_win32_getlocale (); char locale[2]; locale[0] = tem[0]; locale[1] = tem[1]; g_free (tem); #else const char *locale = setlocale (LC_CTYPE, NULL); #endif switch (locale[0]) { case 'a': if (locale[1] == 'z') return LOCALE_TURKIC; break; case 'l': if (locale[1] == 't') return LOCALE_LITHUANIAN; break; case 't': if (locale[1] == 'r') return LOCALE_TURKIC; break; } return LOCALE_NORMAL; } static gint output_marks (const char **p_inout, char *out_buffer, gboolean remove_dot) { const char *p = *p_inout; gint len = 0; while (*p) { gunichar c = g_utf8_get_char (p); if (ISMARK (TYPE (c))) { if (!remove_dot || c != 0x307 /* COMBINING DOT ABOVE */) len += g_unichar_to_utf8 (c, out_buffer ? out_buffer + len : NULL); p = g_utf8_next_char (p); } else break; } *p_inout = p; return len; } static gint output_special_case (gchar *out_buffer, int offset, int type, int which) { const gchar *p = special_case_table + offset; gint len; if (type != G_UNICODE_TITLECASE_LETTER) p = g_utf8_next_char (p); if (which == 1) p += strlen (p) + 1; len = strlen (p); if (out_buffer) memcpy (out_buffer, p, len); return len; } static gsize real_toupper (const gchar *str, gssize max_len, gchar *out_buffer, LocaleType locale_type) { const gchar *p = str; const char *last = NULL; gsize len = 0; gboolean last_was_i = FALSE; while ((max_len < 0 || p < str + max_len) && *p) { gunichar c = g_utf8_get_char (p); int t = TYPE (c); gunichar val; last = p; p = g_utf8_next_char (p); if (locale_type == LOCALE_LITHUANIAN) { if (c == 'i') last_was_i = TRUE; else { if (last_was_i) { /* Nasty, need to remove any dot above. Though * I think only E WITH DOT ABOVE occurs in practice * which could simplify this considerably. */ gsize decomp_len, i; gunichar decomp[G_UNICHAR_MAX_DECOMPOSITION_LENGTH]; decomp_len = g_unichar_fully_decompose (c, FALSE, decomp, G_N_ELEMENTS (decomp)); for (i=0; i < decomp_len; i++) { if (decomp[i] != 0x307 /* COMBINING DOT ABOVE */) len += g_unichar_to_utf8 (g_unichar_toupper (decomp[i]), out_buffer ? out_buffer + len : NULL); } len += output_marks (&p, out_buffer ? out_buffer + len : NULL, TRUE); continue; } if (!ISMARK (t)) last_was_i = FALSE; } } if (locale_type == LOCALE_TURKIC && c == 'i') { /* i => LATIN CAPITAL LETTER I WITH DOT ABOVE */ len += g_unichar_to_utf8 (0x130, out_buffer ? out_buffer + len : NULL); } else if (c == 0x0345) /* COMBINING GREEK YPOGEGRAMMENI */ { /* Nasty, need to move it after other combining marks .. this would go away if * we normalized first. */ len += output_marks (&p, out_buffer ? out_buffer + len : NULL, FALSE); /* And output as GREEK CAPITAL LETTER IOTA */ len += g_unichar_to_utf8 (0x399, out_buffer ? out_buffer + len : NULL); } else if (IS (t, OR (G_UNICODE_LOWERCASE_LETTER, OR (G_UNICODE_TITLECASE_LETTER, 0)))) { val = ATTTABLE (c >> 8, c & 0xff); if (val >= 0x1000000) { len += output_special_case (out_buffer ? out_buffer + len : NULL, val - 0x1000000, t, t == G_UNICODE_LOWERCASE_LETTER ? 0 : 1); } else { if (t == G_UNICODE_TITLECASE_LETTER) { unsigned int i; for (i = 0; i < G_N_ELEMENTS (title_table); ++i) { if (title_table[i][0] == c) { val = title_table[i][1]; break; } } } /* Some lowercase letters, e.g., U+000AA, FEMININE ORDINAL INDICATOR, * do not have an uppercase equivalent, in which case val will be * zero. */ len += g_unichar_to_utf8 (val ? val : c, out_buffer ? out_buffer + len : NULL); } } else { gsize char_len = g_utf8_skip[*(guchar *)last]; if (out_buffer) memcpy (out_buffer + len, last, char_len); len += char_len; } } return len; } /** * g_utf8_strup: * @str: a UTF-8 encoded string * @len: length of @str, in bytes, or -1 if @str is nul-terminated. * * Converts all Unicode characters in the string that have a case * to uppercase. The exact manner that this is done depends * on the current locale, and may result in the number of * characters in the string increasing. (For instance, the * German ess-zet will be changed to SS.) * * Return value: a newly allocated string, with all characters * converted to uppercase. **/ gchar * g_utf8_strup (const gchar *str, gssize len) { gsize result_len; LocaleType locale_type; gchar *result; g_return_val_if_fail (str != NULL, NULL); locale_type = get_locale_type (); /* * We use a two pass approach to keep memory management simple */ result_len = real_toupper (str, len, NULL, locale_type); result = g_malloc (result_len + 1); real_toupper (str, len, result, locale_type); result[result_len] = '\0'; return result; } /* traverses the string checking for characters with combining class == 230 * until a base character is found */ static gboolean has_more_above (const gchar *str) { const gchar *p = str; gint combining_class; while (*p) { combining_class = g_unichar_combining_class (g_utf8_get_char (p)); if (combining_class == 230) return TRUE; else if (combining_class == 0) break; p = g_utf8_next_char (p); } return FALSE; } static gsize real_tolower (const gchar *str, gssize max_len, gchar *out_buffer, LocaleType locale_type) { const gchar *p = str; const char *last = NULL; gsize len = 0; while ((max_len < 0 || p < str + max_len) && *p) { gunichar c = g_utf8_get_char (p); int t = TYPE (c); gunichar val; last = p; p = g_utf8_next_char (p); if (locale_type == LOCALE_TURKIC && c == 'I') { if (g_utf8_get_char (p) == 0x0307) { /* I + COMBINING DOT ABOVE => i (U+0069) */ len += g_unichar_to_utf8 (0x0069, out_buffer ? out_buffer + len : NULL); p = g_utf8_next_char (p); } else { /* I => LATIN SMALL LETTER DOTLESS I */ len += g_unichar_to_utf8 (0x131, out_buffer ? out_buffer + len : NULL); } } /* Introduce an explicit dot above when lowercasing capital I's and J's * whenever there are more accents above. [SpecialCasing.txt] */ else if (locale_type == LOCALE_LITHUANIAN && (c == 0x00cc || c == 0x00cd || c == 0x0128)) { len += g_unichar_to_utf8 (0x0069, out_buffer ? out_buffer + len : NULL); len += g_unichar_to_utf8 (0x0307, out_buffer ? out_buffer + len : NULL); switch (c) { case 0x00cc: len += g_unichar_to_utf8 (0x0300, out_buffer ? out_buffer + len : NULL); break; case 0x00cd: len += g_unichar_to_utf8 (0x0301, out_buffer ? out_buffer + len : NULL); break; case 0x0128: len += g_unichar_to_utf8 (0x0303, out_buffer ? out_buffer + len : NULL); break; } } else if (locale_type == LOCALE_LITHUANIAN && (c == 'I' || c == 'J' || c == 0x012e) && has_more_above (p)) { len += g_unichar_to_utf8 (g_unichar_tolower (c), out_buffer ? out_buffer + len : NULL); len += g_unichar_to_utf8 (0x0307, out_buffer ? out_buffer + len : NULL); } else if (c == 0x03A3) /* GREEK CAPITAL LETTER SIGMA */ { if ((max_len < 0 || p < str + max_len) && *p) { gunichar next_c = g_utf8_get_char (p); int next_type = TYPE(next_c); /* SIGMA mapps differently depending on whether it is * final or not. The following simplified test would * fail in the case of combining marks following the * sigma, but I don't think that occurs in real text. * The test here matches that in ICU. */ if (ISALPHA (next_type)) /* Lu,Ll,Lt,Lm,Lo */ val = 0x3c3; /* GREEK SMALL SIGMA */ else val = 0x3c2; /* GREEK SMALL FINAL SIGMA */ } else val = 0x3c2; /* GREEK SMALL FINAL SIGMA */ len += g_unichar_to_utf8 (val, out_buffer ? out_buffer + len : NULL); } else if (IS (t, OR (G_UNICODE_UPPERCASE_LETTER, OR (G_UNICODE_TITLECASE_LETTER, 0)))) { val = ATTTABLE (c >> 8, c & 0xff); if (val >= 0x1000000) { len += output_special_case (out_buffer ? out_buffer + len : NULL, val - 0x1000000, t, 0); } else { if (t == G_UNICODE_TITLECASE_LETTER) { unsigned int i; for (i = 0; i < G_N_ELEMENTS (title_table); ++i) { if (title_table[i][0] == c) { val = title_table[i][2]; break; } } } /* Not all uppercase letters are guaranteed to have a lowercase * equivalent. If this is the case, val will be zero. */ len += g_unichar_to_utf8 (val ? val : c, out_buffer ? out_buffer + len : NULL); } } else { gsize char_len = g_utf8_skip[*(guchar *)last]; if (out_buffer) memcpy (out_buffer + len, last, char_len); len += char_len; } } return len; } /** * g_utf8_strdown: * @str: a UTF-8 encoded string * @len: length of @str, in bytes, or -1 if @str is nul-terminated. * * Converts all Unicode characters in the string that have a case * to lowercase. The exact manner that this is done depends * on the current locale, and may result in the number of * characters in the string changing. * * Return value: a newly allocated string, with all characters * converted to lowercase. **/ gchar * g_utf8_strdown (const gchar *str, gssize len) { gsize result_len; LocaleType locale_type; gchar *result; g_return_val_if_fail (str != NULL, NULL); locale_type = get_locale_type (); /* * We use a two pass approach to keep memory management simple */ result_len = real_tolower (str, len, NULL, locale_type); result = g_malloc (result_len + 1); real_tolower (str, len, result, locale_type); result[result_len] = '\0'; return result; } /** * g_utf8_casefold: * @str: a UTF-8 encoded string * @len: length of @str, in bytes, or -1 if @str is nul-terminated. * * Converts a string into a form that is independent of case. The * result will not correspond to any particular case, but can be * compared for equality or ordered with the results of calling * g_utf8_casefold() on other strings. * * Note that calling g_utf8_casefold() followed by g_utf8_collate() is * only an approximation to the correct linguistic case insensitive * ordering, though it is a fairly good one. Getting this exactly * right would require a more sophisticated collation function that * takes case sensitivity into account. GLib does not currently * provide such a function. * * Return value: a newly allocated string, that is a * case independent form of @str. **/ gchar * g_utf8_casefold (const gchar *str, gssize len) { GString *result; const char *p; g_return_val_if_fail (str != NULL, NULL); result = g_string_new (NULL); p = str; while ((len < 0 || p < str + len) && *p) { gunichar ch = g_utf8_get_char (p); int start = 0; int end = G_N_ELEMENTS (casefold_table); if (ch >= casefold_table[start].ch && ch <= casefold_table[end - 1].ch) { while (TRUE) { int half = (start + end) / 2; if (ch == casefold_table[half].ch) { g_string_append (result, casefold_table[half].data); goto next; } else if (half == start) break; else if (ch > casefold_table[half].ch) start = half; else end = half; } } g_string_append_unichar (result, g_unichar_tolower (ch)); next: p = g_utf8_next_char (p); } return g_string_free (result, FALSE); } /** * g_unichar_get_mirror_char: * @ch: a Unicode character * @mirrored_ch: location to store the mirrored character * * In Unicode, some characters are mirrored. This * means that their images are mirrored horizontally in text that is laid * out from right to left. For instance, "(" would become its mirror image, * ")", in right-to-left text. * * If @ch has the Unicode mirrored property and there is another unicode * character that typically has a glyph that is the mirror image of @ch's * glyph and @mirrored_ch is set, it puts that character in the address * pointed to by @mirrored_ch. Otherwise the original character is put. * * Return value: %TRUE if @ch has a mirrored character, %FALSE otherwise * * Since: 2.4 **/ gboolean g_unichar_get_mirror_char (gunichar ch, gunichar *mirrored_ch) { gboolean found; gunichar mirrored; mirrored = GLIB_GET_MIRRORING(ch); found = ch != mirrored; if (mirrored_ch) *mirrored_ch = mirrored; return found; } #define G_SCRIPT_TABLE_MIDPOINT (G_N_ELEMENTS (g_script_table) / 2) static inline GUnicodeScript g_unichar_get_script_bsearch (gunichar ch) { int lower = 0; int upper = G_N_ELEMENTS (g_script_table) - 1; static int saved_mid = G_SCRIPT_TABLE_MIDPOINT; int mid = saved_mid; do { if (ch < g_script_table[mid].start) upper = mid - 1; else if (ch >= g_script_table[mid].start + g_script_table[mid].chars) lower = mid + 1; else return g_script_table[saved_mid = mid].script; mid = (lower + upper) / 2; } while (lower <= upper); return G_UNICODE_SCRIPT_UNKNOWN; } /** * g_unichar_get_script: * @ch: a Unicode character * * Looks up the #GUnicodeScript for a particular character (as defined * by Unicode Standard Annex \#24). No check is made for @ch being a * valid Unicode character; if you pass in invalid character, the * result is undefined. * * This function is equivalent to pango_script_for_unichar() and the * two are interchangeable. * * Return value: the #GUnicodeScript for the character. * * Since: 2.14 */ GUnicodeScript g_unichar_get_script (gunichar ch) { if (ch < G_EASY_SCRIPTS_RANGE) return g_script_easy_table[ch]; else return g_unichar_get_script_bsearch (ch); } /* http://unicode.org/iso15924/ */ static const guint32 iso15924_tags[] = { #define PACK(a,b,c,d) ((guint32)((((guint8)(a))<<24)|(((guint8)(b))<<16)|(((guint8)(c))<<8)|((guint8)(d)))) PACK ('Z','y','y','y'), /* G_UNICODE_SCRIPT_COMMON */ PACK ('Z','i','n','h'), /* G_UNICODE_SCRIPT_INHERITED */ PACK ('A','r','a','b'), /* G_UNICODE_SCRIPT_ARABIC */ PACK ('A','r','m','n'), /* G_UNICODE_SCRIPT_ARMENIAN */ PACK ('B','e','n','g'), /* G_UNICODE_SCRIPT_BENGALI */ PACK ('B','o','p','o'), /* G_UNICODE_SCRIPT_BOPOMOFO */ PACK ('C','h','e','r'), /* G_UNICODE_SCRIPT_CHEROKEE */ PACK ('C','o','p','t'), /* G_UNICODE_SCRIPT_COPTIC */ PACK ('C','y','r','l'), /* G_UNICODE_SCRIPT_CYRILLIC */ PACK ('D','s','r','t'), /* G_UNICODE_SCRIPT_DESERET */ PACK ('D','e','v','a'), /* G_UNICODE_SCRIPT_DEVANAGARI */ PACK ('E','t','h','i'), /* G_UNICODE_SCRIPT_ETHIOPIC */ PACK ('G','e','o','r'), /* G_UNICODE_SCRIPT_GEORGIAN */ PACK ('G','o','t','h'), /* G_UNICODE_SCRIPT_GOTHIC */ PACK ('G','r','e','k'), /* G_UNICODE_SCRIPT_GREEK */ PACK ('G','u','j','r'), /* G_UNICODE_SCRIPT_GUJARATI */ PACK ('G','u','r','u'), /* G_UNICODE_SCRIPT_GURMUKHI */ PACK ('H','a','n','i'), /* G_UNICODE_SCRIPT_HAN */ PACK ('H','a','n','g'), /* G_UNICODE_SCRIPT_HANGUL */ PACK ('H','e','b','r'), /* G_UNICODE_SCRIPT_HEBREW */ PACK ('H','i','r','a'), /* G_UNICODE_SCRIPT_HIRAGANA */ PACK ('K','n','d','a'), /* G_UNICODE_SCRIPT_KANNADA */ PACK ('K','a','n','a'), /* G_UNICODE_SCRIPT_KATAKANA */ PACK ('K','h','m','r'), /* G_UNICODE_SCRIPT_KHMER */ PACK ('L','a','o','o'), /* G_UNICODE_SCRIPT_LAO */ PACK ('L','a','t','n'), /* G_UNICODE_SCRIPT_LATIN */ PACK ('M','l','y','m'), /* G_UNICODE_SCRIPT_MALAYALAM */ PACK ('M','o','n','g'), /* G_UNICODE_SCRIPT_MONGOLIAN */ PACK ('M','y','m','r'), /* G_UNICODE_SCRIPT_MYANMAR */ PACK ('O','g','a','m'), /* G_UNICODE_SCRIPT_OGHAM */ PACK ('I','t','a','l'), /* G_UNICODE_SCRIPT_OLD_ITALIC */ PACK ('O','r','y','a'), /* G_UNICODE_SCRIPT_ORIYA */ PACK ('R','u','n','r'), /* G_UNICODE_SCRIPT_RUNIC */ PACK ('S','i','n','h'), /* G_UNICODE_SCRIPT_SINHALA */ PACK ('S','y','r','c'), /* G_UNICODE_SCRIPT_SYRIAC */ PACK ('T','a','m','l'), /* G_UNICODE_SCRIPT_TAMIL */ PACK ('T','e','l','u'), /* G_UNICODE_SCRIPT_TELUGU */ PACK ('T','h','a','a'), /* G_UNICODE_SCRIPT_THAANA */ PACK ('T','h','a','i'), /* G_UNICODE_SCRIPT_THAI */ PACK ('T','i','b','t'), /* G_UNICODE_SCRIPT_TIBETAN */ PACK ('C','a','n','s'), /* G_UNICODE_SCRIPT_CANADIAN_ABORIGINAL */ PACK ('Y','i','i','i'), /* G_UNICODE_SCRIPT_YI */ PACK ('T','g','l','g'), /* G_UNICODE_SCRIPT_TAGALOG */ PACK ('H','a','n','o'), /* G_UNICODE_SCRIPT_HANUNOO */ PACK ('B','u','h','d'), /* G_UNICODE_SCRIPT_BUHID */ PACK ('T','a','g','b'), /* G_UNICODE_SCRIPT_TAGBANWA */ /* Unicode-4.0 additions */ PACK ('B','r','a','i'), /* G_UNICODE_SCRIPT_BRAILLE */ PACK ('C','p','r','t'), /* G_UNICODE_SCRIPT_CYPRIOT */ PACK ('L','i','m','b'), /* G_UNICODE_SCRIPT_LIMBU */ PACK ('O','s','m','a'), /* G_UNICODE_SCRIPT_OSMANYA */ PACK ('S','h','a','w'), /* G_UNICODE_SCRIPT_SHAVIAN */ PACK ('L','i','n','b'), /* G_UNICODE_SCRIPT_LINEAR_B */ PACK ('T','a','l','e'), /* G_UNICODE_SCRIPT_TAI_LE */ PACK ('U','g','a','r'), /* G_UNICODE_SCRIPT_UGARITIC */ /* Unicode-4.1 additions */ PACK ('T','a','l','u'), /* G_UNICODE_SCRIPT_NEW_TAI_LUE */ PACK ('B','u','g','i'), /* G_UNICODE_SCRIPT_BUGINESE */ PACK ('G','l','a','g'), /* G_UNICODE_SCRIPT_GLAGOLITIC */ PACK ('T','f','n','g'), /* G_UNICODE_SCRIPT_TIFINAGH */ PACK ('S','y','l','o'), /* G_UNICODE_SCRIPT_SYLOTI_NAGRI */ PACK ('X','p','e','o'), /* G_UNICODE_SCRIPT_OLD_PERSIAN */ PACK ('K','h','a','r'), /* G_UNICODE_SCRIPT_KHAROSHTHI */ /* Unicode-5.0 additions */ PACK ('Z','z','z','z'), /* G_UNICODE_SCRIPT_UNKNOWN */ PACK ('B','a','l','i'), /* G_UNICODE_SCRIPT_BALINESE */ PACK ('X','s','u','x'), /* G_UNICODE_SCRIPT_CUNEIFORM */ PACK ('P','h','n','x'), /* G_UNICODE_SCRIPT_PHOENICIAN */ PACK ('P','h','a','g'), /* G_UNICODE_SCRIPT_PHAGS_PA */ PACK ('N','k','o','o'), /* G_UNICODE_SCRIPT_NKO */ /* Unicode-5.1 additions */ PACK ('K','a','l','i'), /* G_UNICODE_SCRIPT_KAYAH_LI */ PACK ('L','e','p','c'), /* G_UNICODE_SCRIPT_LEPCHA */ PACK ('R','j','n','g'), /* G_UNICODE_SCRIPT_REJANG */ PACK ('S','u','n','d'), /* G_UNICODE_SCRIPT_SUNDANESE */ PACK ('S','a','u','r'), /* G_UNICODE_SCRIPT_SAURASHTRA */ PACK ('C','h','a','m'), /* G_UNICODE_SCRIPT_CHAM */ PACK ('O','l','c','k'), /* G_UNICODE_SCRIPT_OL_CHIKI */ PACK ('V','a','i','i'), /* G_UNICODE_SCRIPT_VAI */ PACK ('C','a','r','i'), /* G_UNICODE_SCRIPT_CARIAN */ PACK ('L','y','c','i'), /* G_UNICODE_SCRIPT_LYCIAN */ PACK ('L','y','d','i'), /* G_UNICODE_SCRIPT_LYDIAN */ /* Unicode-5.2 additions */ PACK ('A','v','s','t'), /* G_UNICODE_SCRIPT_AVESTAN */ PACK ('B','a','m','u'), /* G_UNICODE_SCRIPT_BAMUM */ PACK ('E','g','y','p'), /* G_UNICODE_SCRIPT_EGYPTIAN_HIEROGLYPHS */ PACK ('A','r','m','i'), /* G_UNICODE_SCRIPT_IMPERIAL_ARAMAIC */ PACK ('P','h','l','i'), /* G_UNICODE_SCRIPT_INSCRIPTIONAL_PAHLAVI */ PACK ('P','r','t','i'), /* G_UNICODE_SCRIPT_INSCRIPTIONAL_PARTHIAN */ PACK ('J','a','v','a'), /* G_UNICODE_SCRIPT_JAVANESE */ PACK ('K','t','h','i'), /* G_UNICODE_SCRIPT_KAITHI */ PACK ('L','i','s','u'), /* G_UNICODE_SCRIPT_LISU */ PACK ('M','t','e','i'), /* G_UNICODE_SCRIPT_MEETEI_MAYEK */ PACK ('S','a','r','b'), /* G_UNICODE_SCRIPT_OLD_SOUTH_ARABIAN */ PACK ('O','r','k','h'), /* G_UNICODE_SCRIPT_OLD_TURKIC */ PACK ('S','a','m','r'), /* G_UNICODE_SCRIPT_SAMARITAN */ PACK ('L','a','n','a'), /* G_UNICODE_SCRIPT_TAI_THAM */ PACK ('T','a','v','t'), /* G_UNICODE_SCRIPT_TAI_VIET */ /* Unicode-6.0 additions */ PACK ('B','a','t','k'), /* G_UNICODE_SCRIPT_BATAK */ PACK ('B','r','a','h'), /* G_UNICODE_SCRIPT_BRAHMI */ PACK ('M','a','n','d'), /* G_UNICODE_SCRIPT_MANDAIC */ /* Unicode-6.1 additions */ PACK ('C','a','k','m'), /* G_UNICODE_SCRIPT_CHAKMA */ PACK ('M','e','r','c'), /* G_UNICODE_SCRIPT_MEROITIC_CURSIVE */ PACK ('M','e','r','o'), /* G_UNICODE_SCRIPT_MEROITIC_HIEROGLYPHS */ PACK ('P','l','r','d'), /* G_UNICODE_SCRIPT_MIAO */ PACK ('S','h','r','d'), /* G_UNICODE_SCRIPT_SHARADA */ PACK ('S','o','r','a'), /* G_UNICODE_SCRIPT_SORA_SOMPENG */ PACK ('T','a','k','r'), /* G_UNICODE_SCRIPT_TAKRI */ #undef PACK }; /** * g_unicode_script_to_iso15924: * @script: a Unicode script * * Looks up the ISO 15924 code for @script. ISO 15924 assigns four-letter * codes to scripts. For example, the code for Arabic is 'Arab'. The * four letter codes are encoded as a @guint32 by this function in a * big-endian fashion. That is, the code returned for Arabic is * 0x41726162 (0x41 is ASCII code for 'A', 0x72 is ASCII code for 'r', etc). * * See Codes for the * representation of names of scripts for details. * * Return value: the ISO 15924 code for @script, encoded as an integer, * of zero if @script is %G_UNICODE_SCRIPT_INVALID_CODE or * ISO 15924 code 'Zzzz' (script code for UNKNOWN) if @script is not understood. * * Since: 2.30 */ guint32 g_unicode_script_to_iso15924 (GUnicodeScript script) { if (G_UNLIKELY (script == G_UNICODE_SCRIPT_INVALID_CODE)) return 0; if (G_UNLIKELY (script < 0 || script >= (int) G_N_ELEMENTS (iso15924_tags))) return 0x5A7A7A7A; return iso15924_tags[script]; } /** * g_unicode_script_from_iso15924: * @iso15924: a Unicode script * * Looks up the Unicode script for @iso15924. ISO 15924 assigns four-letter * codes to scripts. For example, the code for Arabic is 'Arab'. * This function accepts four letter codes encoded as a @guint32 in a * big-endian fashion. That is, the code expected for Arabic is * 0x41726162 (0x41 is ASCII code for 'A', 0x72 is ASCII code for 'r', etc). * * See Codes for the * representation of names of scripts for details. * * Return value: the Unicode script for @iso15924, or * of %G_UNICODE_SCRIPT_INVALID_CODE if @iso15924 is zero and * %G_UNICODE_SCRIPT_UNKNOWN if @iso15924 is unknown. * * Since: 2.30 */ GUnicodeScript g_unicode_script_from_iso15924 (guint32 iso15924) { unsigned int i; if (!iso15924) return G_UNICODE_SCRIPT_INVALID_CODE; for (i = 0; i < G_N_ELEMENTS (iso15924_tags); i++) if (iso15924_tags[i] == iso15924) return (GUnicodeScript) i; return G_UNICODE_SCRIPT_UNKNOWN; }