зеркало из https://github.com/mozilla/pjs.git
441 строка
14 KiB
C++
441 строка
14 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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* Pierre Phaneuf <pp@ludusdesign.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 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 "nsString.h"
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#include "nsReadableUtils.h"
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#include "nsInternetCiter.h"
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#include "nsCRT.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 "nsLWBrkCIID.h"
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#include "nsILineBreaker.h"
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const PRUnichar gt ('>');
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const PRUnichar space (' ');
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const PRUnichar nbsp (0xa0);
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const PRUnichar nl ('\n');
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const PRUnichar cr('\r');
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/** Mail citations using the Internet style: > This is a citation
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*/
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nsInternetCiter::nsInternetCiter()
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{
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}
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nsInternetCiter::~nsInternetCiter()
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{
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}
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NS_IMPL_ISUPPORTS1(nsInternetCiter, nsICiter)
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NS_IMETHODIMP
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nsInternetCiter::GetCiteString(const nsAString& aInString, nsAString& aOutString)
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{
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aOutString.Truncate();
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PRUnichar uch = nl;
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// Strip trailing new lines which will otherwise turn up
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// as ugly quoted empty lines.
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nsReadingIterator <PRUnichar> beginIter,endIter;
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aInString.BeginReading(beginIter);
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aInString.EndReading(endIter);
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while(beginIter!= endIter &&
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(*endIter == cr ||
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*endIter == nl))
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{
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--endIter;
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}
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// Loop over the string:
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while (beginIter != endIter)
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{
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if (uch == nl)
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{
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aOutString.Append(gt);
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// No space between >: this is ">>> " style quoting, for
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// compatability with RFC 2646 and format=flowed.
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if (*beginIter != gt)
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aOutString.Append(space);
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}
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uch = *beginIter;
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++beginIter;
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aOutString += uch;
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}
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if (uch != nl)
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aOutString += nl;
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return NS_OK;
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}
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nsresult
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nsInternetCiter::StripCitesAndLinebreaks(const nsAString& aInString,
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nsAString& aOutString,
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PRBool aLinebreaksToo,
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PRInt32* aCiteLevel)
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{
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if (aCiteLevel)
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*aCiteLevel = 0;
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aOutString.Truncate();
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nsReadingIterator <PRUnichar> beginIter,endIter;
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aInString.BeginReading(beginIter);
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aInString.EndReading(endIter);
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while (beginIter!= endIter) // loop over lines
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{
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// Clear out cites first, at the beginning of the line:
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PRInt32 thisLineCiteLevel = 0;
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while (beginIter!= endIter && (*beginIter == gt || nsCRT::IsAsciiSpace(*beginIter)))
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{
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if (*beginIter == gt) ++thisLineCiteLevel;
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++beginIter;
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}
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// Now copy characters until line end:
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while (beginIter != endIter && (*beginIter != '\r' && *beginIter != '\n'))
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{
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aOutString.Append(*beginIter);
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++beginIter;
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}
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if (aLinebreaksToo)
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aOutString.Append(PRUnichar(' '));
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else
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aOutString.Append(PRUnichar('\n')); // DOM linebreaks, not NS_LINEBREAK
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// Skip over any more consecutive linebreak-like characters:
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while (beginIter != endIter && (*beginIter == '\r' || *beginIter == '\n'))
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++beginIter;
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// Done with this line -- update cite level
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if (aCiteLevel && (thisLineCiteLevel > *aCiteLevel))
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*aCiteLevel = thisLineCiteLevel;
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsInternetCiter::StripCites(const nsAString& aInString, nsAString& aOutString)
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{
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return StripCitesAndLinebreaks(aInString, aOutString, PR_FALSE, 0);
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}
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static void AddCite(nsAString& aOutString, PRInt32 citeLevel)
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{
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for (PRInt32 i = 0; i < citeLevel; ++i)
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aOutString.Append(gt);
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if (citeLevel > 0)
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aOutString.Append(space);
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}
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static inline void
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BreakLine(nsAString& aOutString, PRUint32& outStringCol,
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PRUint32 citeLevel)
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{
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aOutString.Append(nl);
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if (citeLevel > 0)
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{
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AddCite(aOutString, citeLevel);
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outStringCol = citeLevel + 1;
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}
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else
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outStringCol = 0;
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}
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static inline PRBool IsSpace(PRUnichar c)
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{
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return (nsCRT::IsAsciiSpace(c) || (c == nl) || (c == cr) || (c == nbsp));
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}
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NS_IMETHODIMP
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nsInternetCiter::Rewrap(const nsAString& aInString,
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PRUint32 aWrapCol, PRUint32 aFirstLineOffset,
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PRBool aRespectNewlines,
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nsAString& aOutString)
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{
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// There shouldn't be returns in this string, only dom newlines.
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// Check to make sure:
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#ifdef DEBUG
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PRInt32 cr = aInString.FindChar(PRUnichar('\r'));
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NS_ASSERTION((cr < 0), "Rewrap: CR in string gotten from DOM!\n");
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#endif /* DEBUG */
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aOutString.Truncate();
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nsresult rv;
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nsCOMPtr<nsILineBreaker> lineBreaker = do_GetService(NS_LBRK_CONTRACTID, &rv);
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NS_ENSURE_SUCCESS(rv, rv);
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// Loop over lines in the input string, rewrapping each one.
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PRUint32 length;
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PRUint32 posInString = 0;
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PRUint32 outStringCol = 0;
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PRUint32 citeLevel = 0;
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const nsPromiseFlatString &tString = PromiseFlatString(aInString);
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length = tString.Length();
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#ifdef DEBUG_wrapping
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int loopcount = 0;
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#endif
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while (posInString < length)
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{
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#ifdef DEBUG_wrapping
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printf("Outer loop: '%s'\n",
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NS_LossyConvertUTF16toASCII(Substring(tString, posInString,
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length-posInString)).get());
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printf("out string is now: '%s'\n",
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NS_LossyConvertUTF16toASCII(aOutString).get());
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#endif
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// Get the new cite level here since we're at the beginning of a line
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PRUint32 newCiteLevel = 0;
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while (posInString < length && tString[posInString] == gt)
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{
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++newCiteLevel;
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++posInString;
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while (posInString < length && tString[posInString] == space)
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++posInString;
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}
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if (posInString >= length)
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break;
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// Special case: if this is a blank line, maintain a blank line
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// (retain the original paragraph breaks)
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if (tString[posInString] == nl && !aOutString.IsEmpty())
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{
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if (aOutString.Last() != nl)
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aOutString.Append(nl);
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AddCite(aOutString, newCiteLevel);
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aOutString.Append(nl);
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++posInString;
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outStringCol = 0;
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continue;
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}
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// If the cite level has changed, then start a new line with the
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// new cite level (but if we're at the beginning of the string,
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// don't bother).
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if (newCiteLevel != citeLevel && posInString > newCiteLevel+1
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&& outStringCol != 0)
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{
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BreakLine(aOutString, outStringCol, 0);
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}
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citeLevel = newCiteLevel;
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// Prepend the quote level to the out string if appropriate
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if (outStringCol == 0)
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{
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AddCite(aOutString, citeLevel);
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outStringCol = citeLevel + (citeLevel ? 1 : 0);
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}
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// If it's not a cite, and we're not at the beginning of a line in
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// the output string, add a space to separate new text from the
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// previous text.
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else if (outStringCol > citeLevel)
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{
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aOutString.Append(space);
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++outStringCol;
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}
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// find the next newline -- don't want to go farther than that
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PRInt32 nextNewline = tString.FindChar(nl, posInString);
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if (nextNewline < 0) nextNewline = length;
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// For now, don't wrap unquoted lines at all.
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// This is because the plaintext edit window has already wrapped them
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// by the time we get them for rewrap, yet when we call the line
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// breaker, it will refuse to break backwards, and we'll end up
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// with a line that's too long and gets displayed as a lone word
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// on a line by itself. Need special logic to detect this case
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// and break it ourselves without resorting to the line breaker.
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if (citeLevel == 0)
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{
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aOutString.Append(Substring(tString, posInString,
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nextNewline-posInString));
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outStringCol += nextNewline - posInString;
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if (nextNewline != (PRInt32)length)
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{
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aOutString.Append(nl);
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outStringCol = 0;
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}
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posInString = nextNewline+1;
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continue;
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}
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// Otherwise we have to use the line breaker and loop
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// over this line of the input string to get all of it:
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while ((PRInt32)posInString < nextNewline)
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{
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#ifdef DEBUG_wrapping
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if (++loopcount > 1000)
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NS_ASSERTION(PR_FALSE, "possible infinite loop in nsInternetCiter\n");
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printf("Inner loop: '%s'\n",
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NS_LossyConvertUTF16toASCII(Substring(tString, posInString,
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nextNewline-posInString)).get());
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#endif
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// Skip over initial spaces:
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while ((PRInt32)posInString < nextNewline
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&& nsCRT::IsAsciiSpace(tString[posInString]))
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++posInString;
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// If this is a short line, just append it and continue:
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if (outStringCol + nextNewline - posInString <= aWrapCol-citeLevel-1)
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{
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// If this short line is the final one in the in string,
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// then we need to include the final newline, if any:
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if (nextNewline+1 == (PRInt32)length && tString[nextNewline-1] == nl)
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++nextNewline;
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// Trim trailing spaces:
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PRInt32 lastRealChar = nextNewline;
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while ((PRUint32)lastRealChar > posInString
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&& nsCRT::IsAsciiSpace(tString[lastRealChar-1]))
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--lastRealChar;
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aOutString += Substring(tString,
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posInString, lastRealChar - posInString);
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outStringCol += lastRealChar - posInString;
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posInString = nextNewline + 1;
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continue;
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}
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PRInt32 eol = posInString + aWrapCol - citeLevel - outStringCol;
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// eol is the prospective end of line.
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// We'll first look backwards from there for a place to break.
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// If it's already less than our current position,
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// then our line is already too long, so break now.
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if (eol <= (PRInt32)posInString)
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{
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BreakLine(aOutString, outStringCol, citeLevel);
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continue; // continue inner loop, with outStringCol now at bol
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}
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PRInt32 breakPt;
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rv = NS_ERROR_BASE;
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if (lineBreaker)
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{
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breakPt = lineBreaker->Prev(tString.get() + posInString,
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length - posInString, eol + 1 - posInString);
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if (breakPt == NS_LINEBREAKER_NEED_MORE_TEXT)
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{
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// if we couldn't find a breakpoint looking backwards,
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// and we're not starting a new line, then end this line
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// and loop around again:
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if (outStringCol > citeLevel + 1)
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{
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BreakLine(aOutString, outStringCol, citeLevel);
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continue; // continue inner loop, with outStringCol now at bol
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}
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// Else try looking forwards:
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breakPt = lineBreaker->Next(tString.get() + posInString,
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length - posInString, eol - posInString);
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if (breakPt == NS_LINEBREAKER_NEED_MORE_TEXT) rv = NS_ERROR_BASE;
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else rv = NS_OK;
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}
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else rv = NS_OK;
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}
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// If rv is okay, then breakPt is the place to break.
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// If we get out here and rv is set, something went wrong with line
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// breaker. Just break the line, hard.
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if (NS_FAILED(rv))
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{
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#ifdef DEBUG_akkana
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printf("nsInternetCiter: LineBreaker not working -- breaking hard\n");
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#endif
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breakPt = eol;
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}
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// Special case: maybe we should have wrapped last time.
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// If the first breakpoint here makes the current line too long,
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// then if we already have text on the current line,
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// break and loop around again.
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// If we're at the beginning of the current line, though,
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// don't force a break since the long word might be a url
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// and breaking it would make it unclickable on the other end.
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const int SLOP = 6;
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if (outStringCol + breakPt > aWrapCol + SLOP
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&& outStringCol > citeLevel+1)
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{
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BreakLine(aOutString, outStringCol, citeLevel);
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continue;
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}
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nsAutoString sub (Substring(tString, posInString, breakPt));
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// skip newlines or whitespace at the end of the string
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PRInt32 subend = sub.Length();
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while (subend > 0 && IsSpace(sub[subend-1]))
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--subend;
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sub.Left(sub, subend);
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aOutString += sub;
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outStringCol += sub.Length();
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// Advance past the whitespace which caused the wrap:
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posInString += breakPt;
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while (posInString < length && IsSpace(tString[posInString]))
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++posInString;
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// Add a newline and the quote level to the out string
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if (posInString < length) // not for the last line, though
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BreakLine(aOutString, outStringCol, citeLevel);
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} // end inner loop within one line of aInString
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#ifdef DEBUG_wrapping
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printf("---------\nEnd inner loop: out string is now '%s'\n-----------\n",
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NS_LossyConvertUTF16toASCII(aOutString).get());
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#endif
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} // end outer loop over lines of aInString
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#ifdef DEBUG_wrapping
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printf("Final out string is now: '%s'\n",
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NS_LossyConvertUTF16toASCII(aOutString).get());
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#endif
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return NS_OK;
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}
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