intl/unicharutil/util/nsBidiUtils.cpp@fc2d59ddac77
intl/unicharutil/util/nsBidiUtils.cpp
Wed, 31 Dec 2014 07:22:50 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 07:22:50 +0100
- branch
- TOR_BUG_3246
- changeset 4
- fc2d59ddac77
- permissions
- -rw-r--r--
Correct previous dual key logic pending first delivery installment.
1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
2 *
3 * This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6 #include "nsBidiUtils.h"
8 #define ARABIC_TO_HINDI_DIGIT_INCREMENT (START_HINDI_DIGITS - START_ARABIC_DIGITS)
9 #define PERSIAN_TO_HINDI_DIGIT_INCREMENT (START_HINDI_DIGITS - START_FARSI_DIGITS)
10 #define ARABIC_TO_PERSIAN_DIGIT_INCREMENT (START_FARSI_DIGITS - START_ARABIC_DIGITS)
11 #define NUM_TO_ARABIC(c) \
12 ((((c)>=START_HINDI_DIGITS) && ((c)<=END_HINDI_DIGITS)) ? \
13 ((c) - (uint16_t)ARABIC_TO_HINDI_DIGIT_INCREMENT) : \
14 ((((c)>=START_FARSI_DIGITS) && ((c)<=END_FARSI_DIGITS)) ? \
15 ((c) - (uint16_t)ARABIC_TO_PERSIAN_DIGIT_INCREMENT) : \
16 (c)))
17 #define NUM_TO_HINDI(c) \
18 ((((c)>=START_ARABIC_DIGITS) && ((c)<=END_ARABIC_DIGITS)) ? \
19 ((c) + (uint16_t)ARABIC_TO_HINDI_DIGIT_INCREMENT): \
20 ((((c)>=START_FARSI_DIGITS) && ((c)<=END_FARSI_DIGITS)) ? \
21 ((c) + (uint16_t)PERSIAN_TO_HINDI_DIGIT_INCREMENT) : \
22 (c)))
23 #define NUM_TO_PERSIAN(c) \
24 ((((c)>=START_HINDI_DIGITS) && ((c)<=END_HINDI_DIGITS)) ? \
25 ((c) - (uint16_t)PERSIAN_TO_HINDI_DIGIT_INCREMENT) : \
26 ((((c)>=START_ARABIC_DIGITS) && ((c)<=END_ARABIC_DIGITS)) ? \
27 ((c) + (uint16_t)ARABIC_TO_PERSIAN_DIGIT_INCREMENT) : \
28 (c)))
30 char16_t HandleNumberInChar(char16_t aChar, bool aPrevCharArabic, uint32_t aNumFlag)
31 {
32 // IBMBIDI_NUMERAL_NOMINAL *
33 // IBMBIDI_NUMERAL_REGULAR
34 // IBMBIDI_NUMERAL_HINDICONTEXT
35 // IBMBIDI_NUMERAL_ARABIC
36 // IBMBIDI_NUMERAL_HINDI
38 switch (aNumFlag) {
39 case IBMBIDI_NUMERAL_HINDI:
40 return NUM_TO_HINDI(aChar);
41 case IBMBIDI_NUMERAL_ARABIC:
42 return NUM_TO_ARABIC(aChar);
43 case IBMBIDI_NUMERAL_PERSIAN:
44 return NUM_TO_PERSIAN(aChar);
45 case IBMBIDI_NUMERAL_REGULAR:
46 case IBMBIDI_NUMERAL_HINDICONTEXT:
47 case IBMBIDI_NUMERAL_PERSIANCONTEXT:
48 // for clipboard handling
49 //XXX do we really want to convert numerals when copying text?
50 if (aPrevCharArabic) {
51 if (aNumFlag == IBMBIDI_NUMERAL_PERSIANCONTEXT)
52 return NUM_TO_PERSIAN(aChar);
53 else
54 return NUM_TO_HINDI(aChar);
55 }
56 else
57 return NUM_TO_ARABIC(aChar);
58 case IBMBIDI_NUMERAL_NOMINAL:
59 default:
60 return aChar;
61 }
62 }
64 nsresult HandleNumbers(char16_t* aBuffer, uint32_t aSize, uint32_t aNumFlag)
65 {
66 uint32_t i;
68 switch (aNumFlag) {
69 case IBMBIDI_NUMERAL_HINDI:
70 case IBMBIDI_NUMERAL_ARABIC:
71 case IBMBIDI_NUMERAL_PERSIAN:
72 case IBMBIDI_NUMERAL_REGULAR:
73 case IBMBIDI_NUMERAL_HINDICONTEXT:
74 case IBMBIDI_NUMERAL_PERSIANCONTEXT:
75 for (i=0;i<aSize;i++)
76 aBuffer[i] = HandleNumberInChar(aBuffer[i], !!(i>0 ? aBuffer[i-1] : 0), aNumFlag);
77 break;
78 case IBMBIDI_NUMERAL_NOMINAL:
79 default:
80 break;
81 }
82 return NS_OK;
83 }
85 bool HasRTLChars(const nsAString& aString)
86 {
87 // This is used to determine whether to enable bidi if a string has
88 // right-to-left characters. To simplify things, anything that could be a
89 // surrogate or RTL presentation form is covered just by testing >= 0xD800).
90 // It's fine to enable bidi in rare cases where it actually isn't needed.
91 int32_t length = aString.Length();
92 for (int32_t i = 0; i < length; i++) {
93 char16_t ch = aString.CharAt(i);
94 if (ch >= 0xD800 || IS_IN_BMP_RTL_BLOCK(ch)) {
95 return true;
96 }
97 }
98 return false;
99 }
