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Diffstat (limited to 'xpcom/io/nsLinebreakConverter.h')
| -rw-r--r-- | xpcom/io/nsLinebreakConverter.h | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/xpcom/io/nsLinebreakConverter.h b/xpcom/io/nsLinebreakConverter.h new file mode 100644 index 0000000000..2ecde3beec --- /dev/null +++ b/xpcom/io/nsLinebreakConverter.h @@ -0,0 +1,141 @@ +/* -*- 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_ |