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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef nsLinebreakConverter_h_
#define nsLinebreakConverter_h_
#include "nscore.h"
#include "nsString.h"
// utility class for converting between different line breaks.
class nsLinebreakConverter
{
public:
// Note: enum must match char* array in GetLinebreakString
typedef enum {
eLinebreakAny, // any kind of linebreak (i.e. "don't care" source)
eLinebreakPlatform, // platform linebreak
eLinebreakContent, // Content model linebreak (LF)
eLinebreakNet, // Form submission linebreak (CRLF)
eLinebreakMac, // CR
eLinebreakUnix, // LF
eLinebreakWindows, // CRLF
eLinebreakSpace // space characters. Only valid as destination type
} ELinebreakType;
enum {
kIgnoreLen = -1
};
/* ConvertLineBreaks
* Convert line breaks in the supplied string, allocating and returning
* a new buffer. Returns nullptr on failure.
* @param aSrc: the source string. if aSrcLen == kIgnoreLen this string is assumed
* to be null terminated, otherwise it must be at least aSrcLen long.
* @param aSrcBreaks: the line breaks in the source. If unknown, pass eLinebreakAny.
* If known, pass the known value, as this may be more efficient.
* @param aDestBreaks: the line breaks you want in the output.
* @param aSrcLen: length of the source. If -1, the source is assumed to be a null-
* terminated string.
* @param aOutLen: used to return character length of returned buffer, if not null.
*/
static char* ConvertLineBreaks(const char* aSrc,
ELinebreakType aSrcBreaks, ELinebreakType aDestBreaks,
int32_t aSrcLen = kIgnoreLen, int32_t* aOutLen = nullptr);
/* ConvertUnicharLineBreaks
* Convert line breaks in the supplied string, allocating and returning
* a new buffer. Returns nullptr on failure.
* @param aSrc: the source string. if aSrcLen == kIgnoreLen this string is assumed
* to be null terminated, otherwise it must be at least aSrcLen long.
* @param aSrcBreaks: the line breaks in the source. If unknown, pass eLinebreakAny.
* If known, pass the known value, as this may be more efficient.
* @param aDestBreaks: the line breaks you want in the output.
* @param aSrcLen: length of the source, in characters. If -1, the source is assumed to be a null-
* terminated string.
* @param aOutLen: used to return character length of returned buffer, if not null.
*/
static char16_t* ConvertUnicharLineBreaks(const char16_t* aSrc,
ELinebreakType aSrcBreaks, ELinebreakType aDestBreaks,
int32_t aSrcLen = kIgnoreLen, int32_t* aOutLen = nullptr);
/* ConvertStringLineBreaks
* Convert line breaks in the supplied string, changing the string buffer (i.e. in-place conversion)
* @param ioString: the string to be converted.
* @param aSrcBreaks: the line breaks in the source. If unknown, pass eLinebreakAny.
* If known, pass the known value, as this may be more efficient.
* @param aDestBreaks: the line breaks you want in the output.
* @param aSrcLen: length of the source, in characters. If -1, the source is assumed to be a null-
* terminated string.
*/
static nsresult ConvertStringLineBreaks(nsString& aIoString,
ELinebreakType aSrcBreaks,
ELinebreakType aDestBreaks);
/* ConvertLineBreaksInSitu
* Convert line breaks in place if possible. NOTE: THIS MAY REALLOCATE THE BUFFER,
* BUT IT WON'T FREE THE OLD BUFFER (because it doesn't know how). So be prepared
* to keep a copy of the old pointer, and free it if this passes back a new pointer.
* ALSO NOTE: DON'T PASS A STATIC STRING POINTER TO THIS FUNCTION.
*
* @param ioBuffer: the source buffer. if aSrcLen == kIgnoreLen this string is assumed
* to be null terminated, otherwise it must be at least aSrcLen long.
* @param aSrcBreaks: the line breaks in the source. If unknown, pass eLinebreakAny.
* If known, pass the known value, as this may be more efficient.
* @param aDestBreaks: the line breaks you want in the output.
* @param aSrcLen: length of the source. If -1, the source is assumed to be a null-
* terminated string.
* @param aOutLen: used to return character length of returned buffer, if not null.
*/
static nsresult ConvertLineBreaksInSitu(char** aIoBuffer,
ELinebreakType aSrcBreaks,
ELinebreakType aDestBreaks,
int32_t aSrcLen = kIgnoreLen,
int32_t* aOutLen = nullptr);
/* ConvertUnicharLineBreaksInSitu
* Convert line breaks in place if possible. NOTE: THIS MAY REALLOCATE THE BUFFER,
* BUT IT WON'T FREE THE OLD BUFFER (because it doesn't know how). So be prepared
* to keep a copy of the old pointer, and free it if this passes back a new pointer.
*
* @param ioBuffer: the source buffer. if aSrcLen == kIgnoreLen this string is assumed
* to be null terminated, otherwise it must be at least aSrcLen long.
* @param aSrcBreaks: the line breaks in the source. If unknown, pass eLinebreakAny.
* If known, pass the known value, as this may be more efficient.
* @param aDestBreaks: the line breaks you want in the output.
* @param aSrcLen: length of the source in characters. If -1, the source is assumed to be a null-
* terminated string.
* @param aOutLen: used to return character length of returned buffer, if not null.
*/
static nsresult ConvertUnicharLineBreaksInSitu(char16_t** aIoBuffer,
ELinebreakType aSrcBreaks,
ELinebreakType aDestBreaks,
int32_t aSrcLen = kIgnoreLen,
int32_t* aOutLen = nullptr);
};
#endif // nsLinebreakConverter_h_
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