зеркало из https://github.com/mozilla/gecko-dev.git
346 строки
10 KiB
C++
346 строки
10 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Corporation code.
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*
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* The Initial Developer of the Original Code is Mozilla Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Jonathan Kew <jfkthame@gmail.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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*
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* This file is based on usc_impl.c from ICU 4.2.0.1, slightly adapted
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* for use within Mozilla Gecko, separate from a standard ICU build.
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*
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* The original ICU license of the code follows:
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*
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* ICU License - ICU 1.8.1 and later
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*
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* COPYRIGHT AND PERMISSION NOTICE
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*
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* Copyright (c) 1995-2009 International Business Machines Corporation and
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* others
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*
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, provided that the above copyright notice(s) and this
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* permission notice appear in all copies of the Software and that both the
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* above copyright notice(s) and this permission notice appear in supporting
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* documentation.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS INCLUDED IN THIS NOTICE
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* BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES,
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* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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* WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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* ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*
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* Except as contained in this notice, the name of a copyright holder shall
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* not be used in advertising or otherwise to promote the sale, use or other
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* dealings in this Software without prior written authorization of the
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* copyright holder.
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*
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* All trademarks and registered trademarks mentioned herein are the property
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* of their respective owners.
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*/
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#include "gfxScriptItemizer.h"
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#include "gfxUnicodeProperties.h"
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#include "gfxFontUtils.h" // for the FindHighestBit function
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#include "harfbuzz/hb.h"
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#include "nsCharTraits.h"
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#define ARRAY_SIZE(array) (sizeof array / sizeof array[0])
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#define MOD(sp) ((sp) % PAREN_STACK_DEPTH)
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#define LIMIT_INC(sp) (((sp) < PAREN_STACK_DEPTH)? (sp) + 1 : PAREN_STACK_DEPTH)
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#define INC(sp,count) (MOD((sp) + (count)))
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#define INC1(sp) (INC(sp, 1))
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#define DEC(sp,count) (MOD((sp) + PAREN_STACK_DEPTH - (count)))
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#define DEC1(sp) (DEC(sp, 1))
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#define STACK_IS_EMPTY() (pushCount <= 0)
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#define STACK_IS_NOT_EMPTY() (! STACK_IS_EMPTY())
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#define TOP() (parenStack[parenSP])
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#define SYNC_FIXUP() (fixupCount = 0)
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static const PRUint16 pairedChars[] = {
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0x0028, 0x0029, /* ascii paired punctuation */
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0x003c, 0x003e,
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0x005b, 0x005d,
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0x007b, 0x007d,
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0x00ab, 0x00bb, /* guillemets */
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0x2018, 0x2019, /* general punctuation */
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0x201c, 0x201d,
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0x2039, 0x203a,
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0x207d, 0x207e, /* superscripts and subscripts */
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0x208d, 0x208e,
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0x275b, 0x275c, /* dingbat quotes and brackets */
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0x275d, 0x275e,
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0x2768, 0x2769,
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0x276a, 0x276b,
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0x276c, 0x276d,
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0x276e, 0x276f,
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0x2770, 0x2771,
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0x2772, 0x2773,
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0x2774, 0x2775,
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/* omitted: lots of potentially-paired math symbols */
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0x2e22, 0x2e23, /* supplemental punctuation */
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0x2e24, 0x2e25,
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0x2e26, 0x2e27,
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0x2e28, 0x2e29,
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0x3008, 0x3009, /* chinese paired punctuation */
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0x300a, 0x300b,
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0x300c, 0x300d,
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0x300e, 0x300f,
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0x3010, 0x3011,
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0x3014, 0x3015,
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0x3016, 0x3017,
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0x3018, 0x3019,
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0x301a, 0x301b,
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0xfe59, 0xfe5a, /* small form variants */
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0xfe5b, 0xfe5c,
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0xfe5d, 0xfe5e,
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0xfe64, 0xfe65,
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0xff08, 0xff09, /* half-width and full-width forms */
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0xff1c, 0xff1e,
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0xff3b, 0xff3d,
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0xff5b, 0xff5d,
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0xff5f, 0xff60,
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0xff62, 0xff63
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};
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void
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gfxScriptItemizer::push(PRInt32 pairIndex, PRInt32 scriptCode)
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{
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pushCount = LIMIT_INC(pushCount);
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fixupCount = LIMIT_INC(fixupCount);
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parenSP = INC1(parenSP);
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parenStack[parenSP].pairIndex = pairIndex;
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parenStack[parenSP].scriptCode = scriptCode;
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}
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void
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gfxScriptItemizer::pop()
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{
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if (STACK_IS_EMPTY()) {
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return;
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}
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if (fixupCount > 0) {
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fixupCount -= 1;
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}
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pushCount -= 1;
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parenSP = DEC1(parenSP);
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/* If the stack is now empty, reset the stack
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pointers to their initial values.
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*/
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if (STACK_IS_EMPTY()) {
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parenSP = -1;
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}
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}
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void
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gfxScriptItemizer::fixup(PRInt32 scriptCode)
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{
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PRInt32 fixupSP = DEC(parenSP, fixupCount);
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while (fixupCount-- > 0) {
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fixupSP = INC1(fixupSP);
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parenStack[fixupSP].scriptCode = scriptCode;
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}
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}
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static PRInt32
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getPairIndex(PRUint32 ch)
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{
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PRInt32 pairedCharCount = ARRAY_SIZE(pairedChars);
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PRInt32 pairedCharPower = mozilla::FindHighestBit(pairedCharCount);
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PRInt32 pairedCharExtra = pairedCharCount - pairedCharPower;
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PRInt32 probe = pairedCharPower;
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PRInt32 pairIndex = 0;
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if (ch >= pairedChars[pairedCharExtra]) {
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pairIndex = pairedCharExtra;
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}
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while (probe > 1) {
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probe >>= 1;
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if (ch >= pairedChars[pairIndex + probe]) {
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pairIndex += probe;
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}
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}
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if (pairedChars[pairIndex] != ch) {
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pairIndex = -1;
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}
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return pairIndex;
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}
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static bool
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sameScript(PRInt32 scriptOne, PRInt32 scriptTwo)
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{
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return scriptOne <= HB_SCRIPT_INHERITED ||
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scriptTwo <= HB_SCRIPT_INHERITED ||
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scriptOne == scriptTwo;
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}
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gfxScriptItemizer::gfxScriptItemizer(const PRUnichar *src, PRUint32 length)
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: textPtr(src), textLength(length)
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{
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reset();
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}
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void
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gfxScriptItemizer::SetText(const PRUnichar *src, PRUint32 length)
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{
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textPtr = src;
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textLength = length;
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reset();
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}
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PRBool
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gfxScriptItemizer::Next(PRUint32& aRunStart, PRUint32& aRunLimit,
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PRInt32& aRunScript)
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{
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/* if we've fallen off the end of the text, we're done */
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if (scriptLimit >= textLength) {
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return PR_FALSE;
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}
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SYNC_FIXUP();
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scriptCode = HB_SCRIPT_COMMON;
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for (scriptStart = scriptLimit; scriptLimit < textLength; scriptLimit += 1) {
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PRUint32 ch;
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PRInt32 sc;
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PRInt32 pairIndex;
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PRUint32 startOfChar = scriptLimit;
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ch = textPtr[scriptLimit];
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/*
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* MODIFICATION for Gecko - clear the paired-character stack
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* when we see a space character, because we cannot trust
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* context outside the current "word" when doing textrun
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* construction
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*/
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if (ch == 0x20) {
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while (STACK_IS_NOT_EMPTY()) {
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pop();
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}
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sc = HB_SCRIPT_COMMON;
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pairIndex = -1;
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} else {
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/* decode UTF-16 (may be surrogate pair) */
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if (NS_IS_HIGH_SURROGATE(ch) && scriptLimit < textLength - 1) {
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PRUint32 low = textPtr[scriptLimit + 1];
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if (NS_IS_LOW_SURROGATE(low)) {
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ch = SURROGATE_TO_UCS4(ch, low);
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scriptLimit += 1;
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}
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}
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sc = gfxUnicodeProperties::GetScriptCode(ch);
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pairIndex = getPairIndex(ch);
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/*
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* Paired character handling:
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*
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* if it's an open character, push it onto the stack.
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* if it's a close character, find the matching open on the
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* stack, and use that script code. Any non-matching open
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* characters above it on the stack will be poped.
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*/
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if (pairIndex >= 0) {
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if ((pairIndex & 1) == 0) {
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push(pairIndex, scriptCode);
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} else {
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PRInt32 pi = pairIndex & ~1;
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while (STACK_IS_NOT_EMPTY() && TOP().pairIndex != pi) {
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pop();
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}
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if (STACK_IS_NOT_EMPTY()) {
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sc = TOP().scriptCode;
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}
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}
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}
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}
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if (sameScript(scriptCode, sc)) {
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if (scriptCode <= HB_SCRIPT_INHERITED && sc > HB_SCRIPT_INHERITED) {
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scriptCode = sc;
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fixup(scriptCode);
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}
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/*
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* if this character is a close paired character,
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* pop the matching open character from the stack
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*/
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if (pairIndex >= 0 && (pairIndex & 1) != 0) {
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pop();
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}
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} else {
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/*
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* reset scriptLimit in case it was advanced during reading a
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* multiple-code-unit character
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*/
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scriptLimit = startOfChar;
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break;
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}
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}
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aRunStart = scriptStart;
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aRunLimit = scriptLimit;
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aRunScript = scriptCode;
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return PR_TRUE;
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}
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