mirror of
https://github.com/mozilla/gecko-dev.git
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130 lines
4.4 KiB
C++
130 lines
4.4 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 mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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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 of the GNU General Public License Version 2 or later (the "GPL"),
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* or 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 "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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/*
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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 nsAString& aInString,
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PRUint32 aWrapCol, PRUint32 aFirstLineOffset,
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PRBool aRespectNewlines,
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const nsAString &aLineStartStr,
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nsAString& 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 = CallGetService(NS_LWBRK_CONTRACTID, &lf);
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if (NS_SUCCEEDED(rv))
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{
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nsAutoString lbarg;
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lf->GetBreaker(lbarg, getter_AddRefs(lineBreaker));
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NS_RELEASE(lf);
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}
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aOutString.Truncate();
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// Now we either have a line breaker, or we don't.
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const nsPromiseFlatString &tString = PromiseFlatString(aInString);
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PRInt32 length = tString.Length();
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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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