зеркало из https://github.com/mozilla/gecko-dev.git
120 строки
3.7 KiB
C++
120 строки
3.7 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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#include "nsWrapUtils.h"
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#include "nsCOMPtr.h"
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// Line breaker stuff
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#include "nsIServiceManager.h"
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#include "nsILineBreakerFactory.h"
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#include "nsLWBrkCIID.h"
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static NS_DEFINE_CID(kLWBrkCID, NS_LWBRK_CID);
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/*
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* Rewrap the given section of string, putting the result in aOutString.
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*/
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nsresult
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nsWrapUtils::Rewrap(const nsAReadableString& aInString,
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PRUint32 aWrapCol, PRUint32 aFirstLineOffset,
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PRBool aRespectNewlines,
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const nsAReadableString &aLineStartStr,
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nsAWritableString& aOutString)
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{
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PRInt32 i;
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nsCOMPtr<nsILineBreaker> lineBreaker;
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nsILineBreakerFactory *lf;
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nsresult rv = NS_OK;
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rv = nsServiceManager::GetService(kLWBrkCID,
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NS_GET_IID(nsILineBreakerFactory),
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(nsISupports **)&lf);
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if (NS_SUCCEEDED(rv))
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{
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nsAutoString lbarg;
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rv = lf->GetBreaker(lbarg, getter_AddRefs(lineBreaker));
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nsServiceManager::ReleaseService(kLWBrkCID, lf);
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}
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aOutString.SetLength(0);
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// Now we either have a line breaker, or we don't.
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PRInt32 length = aInString.Length();
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nsString tString(aInString);
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const PRUnichar* unicodeStr = tString.get();
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for (i = 0; i < length; ) // loop over lines
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{
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nsAutoString remaining(unicodeStr + i, length - i);
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// If there's a first-line offset, that means we're not starting
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// at the beginning of the line, so don't add a cite string there:
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if (!aFirstLineOffset)
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aOutString.Append(aLineStartStr);
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PRInt32 eol = i + aWrapCol - aFirstLineOffset;
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if (eol > length)
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{
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aOutString.Append(unicodeStr + i, length - i);
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aOutString.Append(PRUnichar('\n')); // DOM line breaks, not NS_LINEBREAK
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break;
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}
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if (i > 0) aFirstLineOffset = 0;
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// eol is the prospective end of line ...
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// look backwards from there for a place to break.
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PRUint32 breakPt;
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PRBool needMore;
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rv = NS_ERROR_BASE;
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if (lineBreaker)
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{
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rv = lineBreaker->Prev(unicodeStr + i, length - i, eol - i,
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&breakPt, &needMore);
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if (NS_FAILED(rv) || needMore)
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{
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rv = lineBreaker->Next(unicodeStr + i, length - i, eol - i,
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&breakPt, &needMore);
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if (needMore) rv = NS_ERROR_BASE;
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}
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}
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// If we get out here and rv is set, something went wrong with line breaker.
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// Just break the line, hard.
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// If rv is okay, then breakPt is the place to break.
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if (NS_FAILED(rv))
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{
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#ifdef DEBUG_akkana
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printf("nsILineBreaker not working -- breaking hard\n");
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#endif
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breakPt = eol+1;
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}
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else breakPt += i;
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nsAutoString appending(unicodeStr + i, breakPt - i);
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aOutString.Append(unicodeStr + i, breakPt - i);
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aOutString.Append(PRUnichar('\n')); // DOM line breaks, not NS_LINEBREAK
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i = breakPt;
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} // continue looping over lines
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return NS_OK;
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}
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