1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
|
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/*
* This file is based on usc_impl.c from ICU 4.2.0.1, slightly adapted
* for use within Mozilla Gecko, separate from a standard ICU build.
*
* The original ICU license of the code follows:
*
* ICU License - ICU 1.8.1 and later
*
* COPYRIGHT AND PERMISSION NOTICE
*
* Copyright (c) 1995-2009 International Business Machines Corporation and
* others
*
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, provided that the above copyright notice(s) and this
* permission notice appear in all copies of the Software and that both the
* above copyright notice(s) and this permission notice appear in supporting
* documentation.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
* IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS INCLUDED IN THIS NOTICE
* BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES,
* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
* WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
* ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*
* Except as contained in this notice, the name of a copyright holder shall
* not be used in advertising or otherwise to promote the sale, use or other
* dealings in this Software without prior written authorization of the
* copyright holder.
*
* All trademarks and registered trademarks mentioned herein are the property
* of their respective owners.
*/
#include "gfxScriptItemizer.h"
#include "nsUnicodeProperties.h"
#include "nsCharTraits.h"
#include "harfbuzz/hb.h"
#define MOD(sp) ((sp) % PAREN_STACK_DEPTH)
#define LIMIT_INC(sp) (((sp) < PAREN_STACK_DEPTH)? (sp) + 1 : PAREN_STACK_DEPTH)
#define INC(sp,count) (MOD((sp) + (count)))
#define INC1(sp) (INC(sp, 1))
#define DEC(sp,count) (MOD((sp) + PAREN_STACK_DEPTH - (count)))
#define DEC1(sp) (DEC(sp, 1))
#define STACK_IS_EMPTY() (pushCount <= 0)
#define STACK_IS_NOT_EMPTY() (! STACK_IS_EMPTY())
#define TOP() (parenStack[parenSP])
#define SYNC_FIXUP() (fixupCount = 0)
void
gfxScriptItemizer::push(uint32_t endPairChar, Script newScriptCode)
{
pushCount = LIMIT_INC(pushCount);
fixupCount = LIMIT_INC(fixupCount);
parenSP = INC1(parenSP);
parenStack[parenSP].endPairChar = endPairChar;
parenStack[parenSP].scriptCode = newScriptCode;
}
void
gfxScriptItemizer::pop()
{
if (STACK_IS_EMPTY()) {
return;
}
if (fixupCount > 0) {
fixupCount -= 1;
}
pushCount -= 1;
parenSP = DEC1(parenSP);
/* If the stack is now empty, reset the stack
pointers to their initial values.
*/
if (STACK_IS_EMPTY()) {
parenSP = -1;
}
}
void
gfxScriptItemizer::fixup(Script newScriptCode)
{
int32_t fixupSP = DEC(parenSP, fixupCount);
while (fixupCount-- > 0) {
fixupSP = INC1(fixupSP);
parenStack[fixupSP].scriptCode = newScriptCode;
}
}
static inline bool
SameScript(Script runScript, Script currCharScript)
{
return runScript <= Script::INHERITED ||
currCharScript <= Script::INHERITED ||
currCharScript == runScript;
}
gfxScriptItemizer::gfxScriptItemizer(const char16_t *src, uint32_t length)
: textPtr(src), textLength(length)
{
reset();
}
void
gfxScriptItemizer::SetText(const char16_t *src, uint32_t length)
{
textPtr = src;
textLength = length;
reset();
}
bool
gfxScriptItemizer::Next(uint32_t& aRunStart, uint32_t& aRunLimit,
Script& aRunScript)
{
/* if we've fallen off the end of the text, we're done */
if (scriptLimit >= textLength) {
return false;
}
SYNC_FIXUP();
scriptCode = Script::COMMON;
for (scriptStart = scriptLimit; scriptLimit < textLength; scriptLimit += 1) {
uint32_t ch;
Script sc;
uint32_t startOfChar = scriptLimit;
ch = textPtr[scriptLimit];
/* decode UTF-16 (may be surrogate pair) */
if (NS_IS_HIGH_SURROGATE(ch) && scriptLimit < textLength - 1) {
uint32_t low = textPtr[scriptLimit + 1];
if (NS_IS_LOW_SURROGATE(low)) {
ch = SURROGATE_TO_UCS4(ch, low);
scriptLimit += 1;
}
}
// Initialize gc to UNASSIGNED; we'll only set it to the true GC
// if the character has script=COMMON, otherwise we don't care.
uint8_t gc = HB_UNICODE_GENERAL_CATEGORY_UNASSIGNED;
sc = GetScriptCode(ch);
if (sc == Script::COMMON) {
/*
* Paired character handling:
*
* if it's an open character, push it onto the stack.
* if it's a close character, find the matching open on the
* stack, and use that script code. Any non-matching open
* characters above it on the stack will be popped.
*
* We only do this if the script is COMMON; for chars with
* specific script assignments, we just use them as-is.
*/
gc = GetGeneralCategory(ch);
if (gc == HB_UNICODE_GENERAL_CATEGORY_OPEN_PUNCTUATION) {
uint32_t endPairChar = mozilla::unicode::GetMirroredChar(ch);
if (endPairChar != ch) {
push(endPairChar, scriptCode);
}
} else if (gc == HB_UNICODE_GENERAL_CATEGORY_CLOSE_PUNCTUATION &&
HasMirroredChar(ch))
{
while (STACK_IS_NOT_EMPTY() && TOP().endPairChar != ch) {
pop();
}
if (STACK_IS_NOT_EMPTY()) {
sc = TOP().scriptCode;
}
}
}
if (SameScript(scriptCode, sc)) {
if (scriptCode <= Script::INHERITED &&
sc > Script::INHERITED)
{
scriptCode = sc;
fixup(scriptCode);
}
/*
* if this character is a close paired character,
* pop the matching open character from the stack
*/
if (gc == HB_UNICODE_GENERAL_CATEGORY_CLOSE_PUNCTUATION &&
HasMirroredChar(ch)) {
pop();
}
} else {
/*
* reset scriptLimit in case it was advanced during reading a
* multiple-code-unit character
*/
scriptLimit = startOfChar;
break;
}
}
aRunStart = scriptStart;
aRunLimit = scriptLimit;
aRunScript = scriptCode;
return true;
}
|
