pjs/editor/libeditor/text/nsInternetCiter.cpp

389 строки
12 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
* Pierre Phaneuf <pp@ludusdesign.com>
*/
#include "nsInternetCiter.h"
#include "nsString.h"
#include "nsCOMPtr.h"
// Line breaker stuff
#include "nsIServiceManager.h"
#include "nsILineBreakerFactory.h"
#include "nsLWBrkCIID.h"
static PRUnichar gt ('>');
static PRUnichar space (' ');
static PRUnichar nl ('\n');
static PRUnichar cr('\r');
/** Mail citations using the Internet style: > This is a citation
*/
static NS_DEFINE_CID(kLWBrkCID, NS_LWBRK_CID);
nsInternetCiter::nsInternetCiter()
{
NS_INIT_REFCNT();
}
nsInternetCiter::~nsInternetCiter()
{
}
NS_IMPL_ADDREF(nsInternetCiter)
NS_IMPL_RELEASE(nsInternetCiter)
NS_IMETHODIMP
nsInternetCiter::QueryInterface(REFNSIID aIID, void** aInstancePtr)
{
if (nsnull == aInstancePtr) {
return NS_ERROR_NULL_POINTER;
}
if (aIID.Equals(NS_GET_IID(nsISupports)))
{
*aInstancePtr = (void*)this;
NS_ADDREF_THIS();
return NS_OK;
}
if (aIID.Equals(NS_GET_IID(nsICiter))) {
*aInstancePtr = (void*)(nsICiter*)this;
NS_ADDREF_THIS();
return NS_OK;
}
return NS_NOINTERFACE;
}
NS_IMETHODIMP
nsInternetCiter::GetCiteString(const nsString& aInString, nsString& aOutString)
{
PRInt32 i = 0;
PRInt32 length = aInString.Length();
aOutString.SetLength(0);
PRUnichar uch = nl;
// Strip trailing new lines which will otherwise turn up
// as ugly quoted empty lines.
while(length > 0 &&
(aInString[length-1] == cr ||
aInString[length-1] == nl))
{
--length;
}
// Loop over the string:
while (i < length)
{
if (uch == nl)
{
aOutString.Append(gt);
// No space between >: this is ">>> " style quoting, for
// compatability with RFC 2646 and format=flowed.
if (aInString[i] != gt)
aOutString.Append(space);
}
uch = aInString[i++];
aOutString += uch;
}
if (uch != nl)
aOutString += nl;
return NS_OK;
}
nsresult
nsInternetCiter::StripCitesAndLinebreaks(const nsString& aInString,
nsString& aOutString,
PRBool aLinebreaksToo,
PRInt32* aCiteLevel)
{
if (aCiteLevel)
*aCiteLevel = 0;
aOutString.SetLength(0);
PRInt32 length = aInString.Length();
PRInt32 i = 0;
while (i < length) // loop over lines
{
// Clear out cites first, at the beginning of the line:
PRInt32 thisLineCiteLevel = 0;
while (aInString[i] == gt || nsCRT::IsAsciiSpace(aInString[i]))
{
if (aInString[i] == gt) ++thisLineCiteLevel;
++i;
}
// Now copy characters until line end:
PRInt32 nextNewline = aInString.FindCharInSet("\r\n", i);
if (nextNewline > i)
{
while (i < nextNewline)
aOutString.Append(aInString[i++]);
if (aLinebreaksToo)
aOutString.AppendWithConversion(' ');
else
aOutString.AppendWithConversion('\n'); // DOM linebreaks, not NS_LINEBREAK
// Skip over any more consecutive linebreak-like characters:
while (i < length && (aInString[i] == '\r' || aInString[i] == '\n'))
++i;
}
else // no more newlines
{
while (i < length)
aOutString.Append(aInString[i++]);
}
// Done with this line -- update cite level
if (aCiteLevel && (thisLineCiteLevel > *aCiteLevel))
*aCiteLevel = thisLineCiteLevel;
}
return NS_OK;
}
NS_IMETHODIMP
nsInternetCiter::StripCites(const nsString& aInString, nsString& aOutString)
{
return StripCitesAndLinebreaks(aInString, aOutString, PR_FALSE, 0);
}
static void AddCite(nsString& aOutString, PRInt32 citeLevel)
{
for (PRInt32 i = 0; i < citeLevel; ++i)
aOutString.Append(gt);
if (citeLevel > 0)
aOutString.Append(space);
}
NS_IMETHODIMP
nsInternetCiter::Rewrap(const nsString& aInString,
PRUint32 aWrapCol, PRUint32 aFirstLineOffset,
PRBool aRespectNewlines,
nsString& aOutString)
{
nsCOMPtr<nsILineBreaker> lineBreaker;
nsILineBreakerFactory *lf;
nsresult rv = NS_OK;
rv = nsServiceManager::GetService(kLWBrkCID,
NS_GET_IID(nsILineBreakerFactory),
(nsISupports **)&lf);
if (NS_SUCCEEDED(rv))
{
nsAutoString lbarg;
rv = lf->GetBreaker(lbarg, getter_AddRefs(lineBreaker));
nsServiceManager::ReleaseService(kLWBrkCID, lf);
}
aOutString.SetLength(0);
// Loop over lines in the input string, rewrapping each one.
PRUint32 length = aInString.Length();
PRUint32 posInString = 0;
PRUint32 outStringCol = 0;
PRUint32 citeLevel = 0;
const PRUnichar* unicodeStr = aInString.GetUnicode();
while (posInString < length)
{
#ifdef DEBUG_wrapping
nsAutoString debug (nsPromiseSubstring<PRUnichar>(aInString, posInString, length-posInString));
printf("Outer loop: '%s'\n", debug.ToNewCString());
#endif
// Get the new cite level here since we're at the beginning of a line
PRUint32 newCiteLevel = 0;
while (posInString < length && aInString[posInString] == gt)
{
++newCiteLevel;
++posInString;
while (posInString < length && aInString[posInString] == space)
++posInString;
}
if (posInString >= length)
break;
// Special case: if this is a blank line, maintain a blank line
// (retain the original paragraph breaks)
if (aInString[posInString] == nl)
{
if (aOutString.Length() > 0 && aOutString[aOutString.Length()-1] != nl)
aOutString.Append(nl);
AddCite(aOutString, newCiteLevel);
aOutString.Append(nl);
++posInString;
outStringCol = 0;
continue;
}
// If the cite level has changed, then start a new line with the
// new cite level (but if we're at the beginning of the string,
// don't bother).
if (newCiteLevel != citeLevel && posInString > newCiteLevel+1
&& outStringCol != 0)
{
//aOutString.Append(nl);
//AddCite(aOutString, citeLevel);
aOutString.Append(nl);
outStringCol = 0;
}
citeLevel = newCiteLevel;
// Prepend the quote level to the out string if appropriate
if (outStringCol == 0)
{
AddCite(aOutString, citeLevel);
outStringCol = citeLevel;
}
// If it's not a cite, and we're not at the beginning of a line in
// the output string, add a space to separate new text from the
// previous text.
else if (outStringCol > 0)
{
#ifdef DEBUG_wrapping
printf("Appending space; citeLevel=%d, outStringCol=%d\n", citeLevel,
outStringCol);
#endif
aOutString.Append(space);
++outStringCol;
}
// find the next newline -- don't want to go farther than that
PRInt32 nextNewline = aInString.FindChar(nl, PR_FALSE, posInString);
if (nextNewline < 0) nextNewline = length;
// For now, don't wrap unquoted lines at all.
// This is because the plaintext edit window has already wrapped them
// by the time we get them for rewrap, yet when we call the line
// breaker, it will refuse to break backwards, and we'll end up
// with a line that's too long and gets displayed as a lone word
// on a line by itself. Need special logic to detect this case
// and break it ourselves without resorting to the line breaker.
if (citeLevel == 0)
{
#ifdef DEBUG_wrapping
nsAutoString debug (nsPromiseSubstring<PRUnichar>(aInString, posInString,
nextNewline-posInString));
printf("Unquoted: appending '%s'\n", debug.ToNewCString());
#endif
aOutString.Append(nsPromiseSubstring<PRUnichar>(aInString, posInString,
nextNewline-posInString));
outStringCol += nextNewline - posInString;
if (nextNewline != (PRInt32)length)
{
#ifdef DEBUG_wrapping
printf("unquoted: appending a newline\n");
#endif
aOutString.Append(nl);
outStringCol = 0;
}
posInString = nextNewline+1;
continue;
}
// Otherwise we have to use the line breaker and loop
// over this line of the input string to get all of it:
while ((PRInt32)posInString < nextNewline)
{
#ifdef DEBUG_wrapping
nsAutoString debug (nsPromiseSubstring<PRUnichar>(aInString, posInString, nextNewline-posInString));
printf("Inner loop: '%s'\n", debug.ToNewCString());
#endif
// If this is a short line, just append it and continue:
if (outStringCol + nextNewline - posInString <= aWrapCol-citeLevel-1)
{
// If this short line is the final one in the in string,
// then we need to include the final newline, if any:
if (nextNewline+1 == (PRInt32)length && aInString[nextNewline-1] == nl)
++nextNewline;
#ifdef DEBUG_wrapping
nsAutoString debug (nsPromiseSubstring<PRUnichar>(aInString, posInString, nextNewline - posInString));
printf("Short line: '%s'\n", debug.ToNewCString());
#endif
aOutString += nsPromiseSubstring<PRUnichar>(aInString,
posInString, nextNewline - posInString);
outStringCol += nextNewline - posInString;
posInString = nextNewline + 1;
continue;
}
PRInt32 eol = posInString + aWrapCol - citeLevel - 1 - outStringCol;
// eol is the prospective end of line ...
// first look backwards from there for a place to break.
PRUint32 breakPt;
PRBool needMore;
rv = NS_ERROR_BASE;
if (lineBreaker)
{
rv = lineBreaker->Prev(unicodeStr + posInString, length - posInString,
eol - posInString, &breakPt, &needMore);
if (NS_FAILED(rv) || needMore)
{
// if we couldn't find a breakpoint looking backwards,
// try looking forwards:
rv = lineBreaker->Next(unicodeStr + posInString,
length - posInString,
eol - posInString, &breakPt, &needMore);
if (needMore) rv = NS_ERROR_BASE;
}
}
// If rv is okay, then breakPt is the place to break.
// If we get out here and rv is set, something went wrong with line
// breaker. Just break the line, hard.
if (NS_FAILED(rv))
{
#ifdef DEBUG_akkana
printf("nsInternetCiter: LineBreaker not working -- breaking hard\n");
#endif
breakPt = eol;
}
#ifdef DEBUG_wrapping
printf("breakPt = %d\n", breakPt);
#endif
aOutString += nsPromiseSubstring<PRUnichar>(aInString, posInString, breakPt);
posInString += breakPt;
outStringCol += breakPt;
// Add a newline and the quote level to the out string
if (posInString < length) // not for the last line, though
{
aOutString.Append(nl);
AddCite(aOutString, citeLevel);
outStringCol = citeLevel + (citeLevel ? 1 : 0);
}
} // end inner loop within one line of aInString
#ifdef DEBUG_wrapping
printf("---------\nEnd inner loop: out string is now '%s'\n-----------\n",
aOutString.ToNewCString());
#endif
} // end outer loop over lines of aInString
return NS_OK;
}