зеркало из https://github.com/mozilla/pjs.git
243 строки
7.5 KiB
C++
243 строки
7.5 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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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 Novell code.
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*
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* The Initial Developer of the Original Code is Novell Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2006
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* robert@ocallahan.org
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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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* ***** END LICENSE BLOCK ***** */
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#include "nsTextFrameUtils.h"
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#include "nsContentUtils.h"
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#include "nsIWordBreaker.h"
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#include "gfxFont.h"
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#include "nsUnicharUtils.h"
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#include "nsBidiUtils.h"
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// XXX TODO implement transform of backslash to yen that nsTextTransform does
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// when requested by PresContext->LanguageSpecificTransformType(). Do it with
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// a new factory type that just munges the input stream. But first, check
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// that we really still need this, it's only enabled via a hidden pref
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// which defaults false...
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#define UNICODE_ZWSP 0x200B
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static PRBool IsDiscardable(PRUnichar ch, PRUint32* aFlags)
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{
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// Unlike IS_DISCARDABLE, we don't discard \r. \r will be ignored by gfxTextRun
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// and discarding it would force us to copy text in many cases of preformatted
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// text containing \r\n.
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if (ch == CH_SHY) {
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*aFlags |= nsTextFrameUtils::TEXT_HAS_SHY;
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return PR_TRUE;
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}
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if ((ch & 0xFF00) != 0x2000) {
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// Not a Bidi control character
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return PR_FALSE;
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}
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return IS_BIDI_CONTROL_CHAR(ch);
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}
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static PRBool IsDiscardable(PRUint8 ch, PRUint32* aFlags)
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{
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if (ch == CH_SHY) {
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*aFlags |= nsTextFrameUtils::TEXT_HAS_SHY;
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return PR_TRUE;
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}
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return PR_FALSE;
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}
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PRUnichar*
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nsTextFrameUtils::TransformText(const PRUnichar* aText, PRUint32 aLength,
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PRUnichar* aOutput,
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CompressionMode aCompression,
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PRPackedBool* aIncomingWhitespace,
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gfxSkipCharsBuilder* aSkipChars,
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PRUint32* aAnalysisFlags)
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{
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PRUint32 flags = 0;
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PRUnichar* outputStart = aOutput;
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if (aCompression == COMPRESS_NONE) {
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// Skip discardables.
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PRUint32 i;
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for (i = 0; i < aLength; ++i) {
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PRUnichar ch = *aText++;
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if (IsDiscardable(ch, &flags)) {
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aSkipChars->SkipChar();
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} else {
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aSkipChars->KeepChar();
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if (ch == '\t') {
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flags |= TEXT_HAS_TAB;
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}
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*aOutput++ = ch;
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}
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}
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*aIncomingWhitespace = PR_FALSE;
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} else {
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PRBool inWhitespace = *aIncomingWhitespace;
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PRUint32 i;
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for (i = 0; i < aLength; ++i) {
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PRUnichar ch = *aText++;
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PRBool nowInWhitespace;
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if (ch == ' ' &&
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(i + 1 >= aLength ||
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!IsSpaceCombiningSequenceTail(aText, aLength - (i + 1)))) {
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nowInWhitespace = PR_TRUE;
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} else if (ch == '\n' && aCompression == COMPRESS_WHITESPACE_NEWLINE) {
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if (i > 0 && IS_CJ_CHAR(aText[-1]) &&
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i + 1 < aLength && IS_CJ_CHAR(aText[1])) {
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// Discard newlines between CJK chars.
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// XXX this really requires more context to get right!
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aSkipChars->SkipChar();
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continue;
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}
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nowInWhitespace = PR_TRUE;
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} else {
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nowInWhitespace = ch == '\t';
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}
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if (!nowInWhitespace) {
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if (IsDiscardable(ch, &flags)) {
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aSkipChars->SkipChar();
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nowInWhitespace = inWhitespace;
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} else {
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*aOutput++ = ch;
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aSkipChars->KeepChar();
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}
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} else {
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if (inWhitespace) {
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aSkipChars->SkipChar();
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} else {
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if (ch != ' ') {
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flags |= TEXT_WAS_TRANSFORMED;
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}
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*aOutput++ = ' ';
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aSkipChars->KeepChar();
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}
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}
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inWhitespace = nowInWhitespace;
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}
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*aIncomingWhitespace = inWhitespace;
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}
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if (outputStart + aLength != aOutput) {
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flags |= TEXT_WAS_TRANSFORMED;
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}
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*aAnalysisFlags = flags;
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return aOutput;
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}
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PRUint8*
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nsTextFrameUtils::TransformText(const PRUint8* aText, PRUint32 aLength,
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PRUint8* aOutput,
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CompressionMode aCompression,
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PRPackedBool* aIncomingWhitespace,
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gfxSkipCharsBuilder* aSkipChars,
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PRUint32* aAnalysisFlags)
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{
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PRUint32 flags = 0;
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PRUint8* outputStart = aOutput;
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if (aCompression == COMPRESS_NONE) {
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// Skip discardables.
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PRUint32 i;
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for (i = 0; i < aLength; ++i) {
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PRUint8 ch = *aText++;
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if (IsDiscardable(ch, &flags)) {
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aSkipChars->SkipChar();
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} else {
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aSkipChars->KeepChar();
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if (ch == '\t') {
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flags |= TEXT_HAS_TAB;
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}
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*aOutput++ = ch;
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}
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}
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*aIncomingWhitespace = PR_FALSE;
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} else {
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PRBool inWhitespace = *aIncomingWhitespace;
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PRUint32 i;
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for (i = 0; i < aLength; ++i) {
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PRUint8 ch = *aText++;
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PRBool nowInWhitespace = ch == ' ' || ch == '\t' ||
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(ch == '\n' && aCompression == COMPRESS_WHITESPACE_NEWLINE);
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if (!nowInWhitespace) {
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if (IsDiscardable(ch, &flags)) {
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aSkipChars->SkipChar();
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nowInWhitespace = inWhitespace;
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} else {
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*aOutput++ = ch;
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aSkipChars->KeepChar();
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}
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} else {
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if (inWhitespace) {
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aSkipChars->SkipChar();
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} else {
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if (ch != ' ') {
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flags |= TEXT_WAS_TRANSFORMED;
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}
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*aOutput++ = ' ';
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aSkipChars->KeepChar();
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}
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}
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inWhitespace = nowInWhitespace;
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}
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*aIncomingWhitespace = inWhitespace;
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}
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if (outputStart + aLength != aOutput) {
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flags |= TEXT_WAS_TRANSFORMED;
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}
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*aAnalysisFlags = flags;
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return aOutput;
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}
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PRBool nsSkipCharsRunIterator::NextRun() {
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do {
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if (mRunLength) {
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mIterator.AdvanceOriginal(mRunLength);
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NS_ASSERTION(mRunLength > 0, "No characters in run (initial length too large?)");
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if (!mSkipped || mLengthIncludesSkipped) {
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mRemainingLength -= mRunLength;
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}
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}
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if (!mRemainingLength)
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return PR_FALSE;
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PRInt32 length;
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mSkipped = mIterator.IsOriginalCharSkipped(&length);
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mRunLength = PR_MIN(length, mRemainingLength);
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} while (!mVisitSkipped && mSkipped);
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return PR_TRUE;
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}
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