mirror of
https://github.com/mozilla/gecko-dev.git
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466 lines
12 KiB
C++
466 lines
12 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsLinebreakConverter.h"
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#include "nsMemory.h"
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#include "nsCRT.h"
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/*----------------------------------------------------------------------------
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GetLinebreakString
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Could make this inline
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----------------------------------------------------------------------------*/
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static const char* GetLinebreakString(nsLinebreakConverter::ELinebreakType aBreakType)
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{
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static const char* const sLinebreaks[] = {
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"", // any
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NS_LINEBREAK, // platform
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LFSTR, // content
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CRLF, // net
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CRSTR, // Mac
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LFSTR, // Unix
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CRLF, // Windows
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" ", // space
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nullptr
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};
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return sLinebreaks[aBreakType];
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}
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/*----------------------------------------------------------------------------
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AppendLinebreak
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Wee inline method to append a line break. Modifies ioDest.
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----------------------------------------------------------------------------*/
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template<class T>
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void AppendLinebreak(T*& ioDest, const char* lineBreakStr)
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{
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*ioDest++ = *lineBreakStr;
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if (lineBreakStr[1])
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*ioDest++ = lineBreakStr[1];
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}
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/*----------------------------------------------------------------------------
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CountChars
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Counts occurrences of breakStr in aSrc
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----------------------------------------------------------------------------*/
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template<class T>
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int32_t CountLinebreaks(const T* aSrc, int32_t inLen, const char* breakStr)
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{
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const T* src = aSrc;
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const T* srcEnd = aSrc + inLen;
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int32_t theCount = 0;
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while (src < srcEnd)
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{
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if (*src == *breakStr)
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{
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src++;
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if (breakStr[1])
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{
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if (src < srcEnd && *src == breakStr[1])
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{
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src++;
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theCount++;
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}
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}
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else
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{
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theCount++;
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}
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}
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else
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{
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src++;
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}
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}
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return theCount;
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}
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/*----------------------------------------------------------------------------
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ConvertBreaks
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ioLen *includes* a terminating null, if any
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----------------------------------------------------------------------------*/
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template<class T>
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static T* ConvertBreaks(const T* inSrc, int32_t& ioLen, const char* srcBreak, const char* destBreak)
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{
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NS_ASSERTION(inSrc && srcBreak && destBreak, "Got a null string");
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T* resultString = nullptr;
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// handle the no conversion case
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if (nsCRT::strcmp(srcBreak, destBreak) == 0)
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{
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resultString = (T *)nsMemory::Alloc(sizeof(T) * ioLen);
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if (!resultString) return nullptr;
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memcpy(resultString, inSrc, sizeof(T) * ioLen); // includes the null, if any
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return resultString;
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}
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int32_t srcBreakLen = strlen(srcBreak);
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int32_t destBreakLen = strlen(destBreak);
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// handle the easy case, where the string length does not change, and the
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// breaks are only 1 char long, i.e. CR <-> LF
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if (srcBreakLen == destBreakLen && srcBreakLen == 1)
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{
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resultString = (T *)nsMemory::Alloc(sizeof(T) * ioLen);
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if (!resultString) return nullptr;
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const T* src = inSrc;
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const T* srcEnd = inSrc + ioLen; // includes null, if any
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T* dst = resultString;
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char srcBreakChar = *srcBreak; // we know it's one char long already
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char dstBreakChar = *destBreak;
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while (src < srcEnd)
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{
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if (*src == srcBreakChar)
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{
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*dst++ = dstBreakChar;
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src++;
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}
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else
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{
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*dst++ = *src++;
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}
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}
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// ioLen does not change
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}
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else
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{
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// src and dest termination is different length. Do it a slower way.
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// count linebreaks in src. Assumes that chars in 2-char linebreaks are unique.
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int32_t numLinebreaks = CountLinebreaks(inSrc, ioLen, srcBreak);
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int32_t newBufLen = ioLen - (numLinebreaks * srcBreakLen) + (numLinebreaks * destBreakLen);
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resultString = (T *)nsMemory::Alloc(sizeof(T) * newBufLen);
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if (!resultString) return nullptr;
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const T* src = inSrc;
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const T* srcEnd = inSrc + ioLen; // includes null, if any
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T* dst = resultString;
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while (src < srcEnd)
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{
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if (*src == *srcBreak)
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{
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*dst++ = *destBreak;
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if (destBreak[1])
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*dst++ = destBreak[1];
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src++;
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if (src < srcEnd && srcBreak[1] && *src == srcBreak[1])
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src++;
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}
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else
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{
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*dst++ = *src++;
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}
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}
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ioLen = newBufLen;
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}
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return resultString;
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}
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/*----------------------------------------------------------------------------
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ConvertBreaksInSitu
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Convert breaks in situ. Can only do this if the linebreak length
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does not change.
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----------------------------------------------------------------------------*/
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template<class T>
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static void ConvertBreaksInSitu(T* inSrc, int32_t inLen, char srcBreak, char destBreak)
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{
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T* src = inSrc;
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T* srcEnd = inSrc + inLen;
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while (src < srcEnd)
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{
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if (*src == srcBreak)
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*src = destBreak;
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src++;
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}
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}
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/*----------------------------------------------------------------------------
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ConvertUnknownBreaks
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Convert unknown line breaks to the specified break.
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This will convert CRLF pairs to one break, and single CR or LF to a break.
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----------------------------------------------------------------------------*/
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template<class T>
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static T* ConvertUnknownBreaks(const T* inSrc, int32_t& ioLen, const char* destBreak)
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{
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const T* src = inSrc;
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const T* srcEnd = inSrc + ioLen; // includes null, if any
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int32_t destBreakLen = strlen(destBreak);
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int32_t finalLen = 0;
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while (src < srcEnd)
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{
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if (*src == nsCRT::CR)
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{
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if (src < srcEnd && src[1] == nsCRT::LF)
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{
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// CRLF
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finalLen += destBreakLen;
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src++;
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}
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else
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{
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// Lone CR
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finalLen += destBreakLen;
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}
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}
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else if (*src == nsCRT::LF)
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{
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// Lone LF
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finalLen += destBreakLen;
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}
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else
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{
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finalLen++;
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}
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src++;
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}
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T* resultString = (T *)nsMemory::Alloc(sizeof(T) * finalLen);
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if (!resultString) return nullptr;
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src = inSrc;
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srcEnd = inSrc + ioLen; // includes null, if any
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T* dst = resultString;
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while (src < srcEnd)
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{
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if (*src == nsCRT::CR)
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{
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if (src < srcEnd && src[1] == nsCRT::LF)
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{
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// CRLF
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AppendLinebreak(dst, destBreak);
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src++;
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}
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else
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{
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// Lone CR
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AppendLinebreak(dst, destBreak);
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}
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}
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else if (*src == nsCRT::LF)
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{
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// Lone LF
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AppendLinebreak(dst, destBreak);
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}
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else
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{
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*dst++ = *src;
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}
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src++;
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}
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ioLen = finalLen;
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return resultString;
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}
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/*----------------------------------------------------------------------------
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ConvertLineBreaks
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----------------------------------------------------------------------------*/
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char* nsLinebreakConverter::ConvertLineBreaks(const char* aSrc,
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ELinebreakType aSrcBreaks, ELinebreakType aDestBreaks, int32_t aSrcLen, int32_t* outLen)
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{
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NS_ASSERTION(aDestBreaks != eLinebreakAny &&
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aSrcBreaks != eLinebreakSpace, "Invalid parameter");
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if (!aSrc) return nullptr;
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int32_t sourceLen = (aSrcLen == kIgnoreLen) ? strlen(aSrc) + 1 : aSrcLen;
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char* resultString;
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if (aSrcBreaks == eLinebreakAny)
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resultString = ConvertUnknownBreaks(aSrc, sourceLen, GetLinebreakString(aDestBreaks));
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else
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resultString = ConvertBreaks(aSrc, sourceLen, GetLinebreakString(aSrcBreaks), GetLinebreakString(aDestBreaks));
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if (outLen)
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*outLen = sourceLen;
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return resultString;
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}
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/*----------------------------------------------------------------------------
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ConvertLineBreaksInSitu
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----------------------------------------------------------------------------*/
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nsresult nsLinebreakConverter::ConvertLineBreaksInSitu(char **ioBuffer, ELinebreakType aSrcBreaks,
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ELinebreakType aDestBreaks, int32_t aSrcLen, int32_t* outLen)
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{
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NS_ASSERTION(ioBuffer && *ioBuffer, "Null pointer passed");
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if (!ioBuffer || !*ioBuffer) return NS_ERROR_NULL_POINTER;
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NS_ASSERTION(aDestBreaks != eLinebreakAny &&
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aSrcBreaks != eLinebreakSpace, "Invalid parameter");
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int32_t sourceLen = (aSrcLen == kIgnoreLen) ? strlen(*ioBuffer) + 1 : aSrcLen;
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// can we convert in-place?
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const char* srcBreaks = GetLinebreakString(aSrcBreaks);
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const char* dstBreaks = GetLinebreakString(aDestBreaks);
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if ( (aSrcBreaks != eLinebreakAny) &&
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(strlen(srcBreaks) == 1) &&
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(strlen(dstBreaks) == 1) )
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{
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ConvertBreaksInSitu(*ioBuffer, sourceLen, *srcBreaks, *dstBreaks);
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if (outLen)
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*outLen = sourceLen;
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}
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else
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{
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char* destBuffer;
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if (aSrcBreaks == eLinebreakAny)
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destBuffer = ConvertUnknownBreaks(*ioBuffer, sourceLen, dstBreaks);
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else
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destBuffer = ConvertBreaks(*ioBuffer, sourceLen, srcBreaks, dstBreaks);
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if (!destBuffer) return NS_ERROR_OUT_OF_MEMORY;
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*ioBuffer = destBuffer;
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if (outLen)
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*outLen = sourceLen;
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}
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return NS_OK;
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}
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/*----------------------------------------------------------------------------
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ConvertUnicharLineBreaks
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----------------------------------------------------------------------------*/
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char16_t* nsLinebreakConverter::ConvertUnicharLineBreaks(const char16_t* aSrc,
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ELinebreakType aSrcBreaks, ELinebreakType aDestBreaks, int32_t aSrcLen, int32_t* outLen)
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{
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NS_ASSERTION(aDestBreaks != eLinebreakAny &&
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aSrcBreaks != eLinebreakSpace, "Invalid parameter");
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if (!aSrc) return nullptr;
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int32_t bufLen = (aSrcLen == kIgnoreLen) ? NS_strlen(aSrc) + 1 : aSrcLen;
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char16_t* resultString;
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if (aSrcBreaks == eLinebreakAny)
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resultString = ConvertUnknownBreaks(aSrc, bufLen, GetLinebreakString(aDestBreaks));
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else
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resultString = ConvertBreaks(aSrc, bufLen, GetLinebreakString(aSrcBreaks), GetLinebreakString(aDestBreaks));
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if (outLen)
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*outLen = bufLen;
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return resultString;
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}
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/*----------------------------------------------------------------------------
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ConvertStringLineBreaks
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----------------------------------------------------------------------------*/
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nsresult nsLinebreakConverter::ConvertUnicharLineBreaksInSitu(char16_t **ioBuffer,
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ELinebreakType aSrcBreaks, ELinebreakType aDestBreaks, int32_t aSrcLen, int32_t* outLen)
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{
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NS_ASSERTION(ioBuffer && *ioBuffer, "Null pointer passed");
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if (!ioBuffer || !*ioBuffer) return NS_ERROR_NULL_POINTER;
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NS_ASSERTION(aDestBreaks != eLinebreakAny &&
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aSrcBreaks != eLinebreakSpace, "Invalid parameter");
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int32_t sourceLen = (aSrcLen == kIgnoreLen) ? NS_strlen(*ioBuffer) + 1 : aSrcLen;
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// can we convert in-place?
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const char* srcBreaks = GetLinebreakString(aSrcBreaks);
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const char* dstBreaks = GetLinebreakString(aDestBreaks);
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if ( (aSrcBreaks != eLinebreakAny) &&
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(strlen(srcBreaks) == 1) &&
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(strlen(dstBreaks) == 1) )
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{
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ConvertBreaksInSitu(*ioBuffer, sourceLen, *srcBreaks, *dstBreaks);
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if (outLen)
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*outLen = sourceLen;
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}
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else
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{
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char16_t* destBuffer;
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if (aSrcBreaks == eLinebreakAny)
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destBuffer = ConvertUnknownBreaks(*ioBuffer, sourceLen, dstBreaks);
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else
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destBuffer = ConvertBreaks(*ioBuffer, sourceLen, srcBreaks, dstBreaks);
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if (!destBuffer) return NS_ERROR_OUT_OF_MEMORY;
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*ioBuffer = destBuffer;
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if (outLen)
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*outLen = sourceLen;
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}
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return NS_OK;
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}
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/*----------------------------------------------------------------------------
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ConvertStringLineBreaks
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----------------------------------------------------------------------------*/
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nsresult nsLinebreakConverter::ConvertStringLineBreaks(nsString& ioString,
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ELinebreakType aSrcBreaks, ELinebreakType aDestBreaks)
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{
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NS_ASSERTION(aDestBreaks != eLinebreakAny &&
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aSrcBreaks != eLinebreakSpace, "Invalid parameter");
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// nothing to do
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if (ioString.IsEmpty()) return NS_OK;
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nsresult rv;
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// remember the old buffer in case
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// we blow it away later
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nsString::char_iterator stringBuf;
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ioString.BeginWriting(stringBuf);
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int32_t newLen;
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rv = ConvertUnicharLineBreaksInSitu(&stringBuf,
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aSrcBreaks, aDestBreaks,
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ioString.Length() + 1, &newLen);
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if (NS_FAILED(rv)) return rv;
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if (stringBuf != ioString.get())
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ioString.Adopt(stringBuf);
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return NS_OK;
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}
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