зеркало из https://github.com/mozilla/gecko-dev.git
487 строки
13 KiB
C++
487 строки
13 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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*
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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
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AppendLinebreak(T*& aIoDest, const char* aLineBreakStr)
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{
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*aIoDest++ = *aLineBreakStr;
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if (aLineBreakStr[1]) {
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*aIoDest++ = aLineBreakStr[1];
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}
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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
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CountLinebreaks(const T* aSrc, int32_t aInLen, const char* aBreakStr)
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{
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const T* src = aSrc;
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const T* srcEnd = aSrc + aInLen;
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int32_t theCount = 0;
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while (src < srcEnd) {
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if (*src == *aBreakStr) {
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src++;
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if (aBreakStr[1]) {
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if (src < srcEnd && *src == aBreakStr[1]) {
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src++;
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theCount++;
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}
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} else {
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theCount++;
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}
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} else {
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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*
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ConvertBreaks(const T* aInSrc, int32_t& aIoLen, const char* aSrcBreak,
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const char* aDestBreak)
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{
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NS_ASSERTION(aInSrc && aSrcBreak && aDestBreak, "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(aSrcBreak, aDestBreak) == 0) {
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resultString = (T*)malloc(sizeof(T) * aIoLen);
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if (!resultString) {
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return nullptr;
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}
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memcpy(resultString, aInSrc, sizeof(T) * aIoLen); // includes the null, if any
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return resultString;
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}
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int32_t srcBreakLen = strlen(aSrcBreak);
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int32_t destBreakLen = strlen(aDestBreak);
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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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resultString = (T*)malloc(sizeof(T) * aIoLen);
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if (!resultString) {
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return nullptr;
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}
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const T* src = aInSrc;
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const T* srcEnd = aInSrc + aIoLen; // includes null, if any
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T* dst = resultString;
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char srcBreakChar = *aSrcBreak; // we know it's one char long already
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char dstBreakChar = *aDestBreak;
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while (src < srcEnd) {
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if (*src == srcBreakChar) {
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*dst++ = dstBreakChar;
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src++;
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} else {
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*dst++ = *src++;
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}
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}
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// aIoLen does not change
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} else {
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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(aInSrc, aIoLen, aSrcBreak);
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int32_t newBufLen =
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aIoLen - (numLinebreaks * srcBreakLen) + (numLinebreaks * destBreakLen);
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resultString = (T*)malloc(sizeof(T) * newBufLen);
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if (!resultString) {
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return nullptr;
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}
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const T* src = aInSrc;
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const T* srcEnd = aInSrc + aIoLen; // includes null, if any
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T* dst = resultString;
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while (src < srcEnd) {
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if (*src == *aSrcBreak) {
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*dst++ = *aDestBreak;
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if (aDestBreak[1]) {
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*dst++ = aDestBreak[1];
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}
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src++;
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if (src < srcEnd && aSrcBreak[1] && *src == aSrcBreak[1]) {
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src++;
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}
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} else {
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*dst++ = *src++;
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}
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}
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aIoLen = 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
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ConvertBreaksInSitu(T* aInSrc, int32_t aInLen, char aSrcBreak, char aDestBreak)
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{
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T* src = aInSrc;
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T* srcEnd = aInSrc + aInLen;
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while (src < srcEnd) {
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if (*src == aSrcBreak) {
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*src = aDestBreak;
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}
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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*
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ConvertUnknownBreaks(const T* aInSrc, int32_t& aIoLen, const char* aDestBreak)
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{
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const T* src = aInSrc;
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const T* srcEnd = aInSrc + aIoLen; // includes null, if any
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int32_t destBreakLen = strlen(aDestBreak);
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int32_t finalLen = 0;
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while (src < srcEnd) {
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if (*src == nsCRT::CR) {
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if (src < srcEnd && src[1] == nsCRT::LF) {
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// CRLF
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finalLen += destBreakLen;
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src++;
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} else {
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// Lone CR
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finalLen += destBreakLen;
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}
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} else if (*src == nsCRT::LF) {
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// Lone LF
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finalLen += destBreakLen;
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} else {
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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*)malloc(sizeof(T) * finalLen);
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if (!resultString) {
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return nullptr;
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}
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src = aInSrc;
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srcEnd = aInSrc + aIoLen; // includes null, if any
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T* dst = resultString;
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while (src < srcEnd) {
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if (*src == nsCRT::CR) {
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if (src < srcEnd && src[1] == nsCRT::LF) {
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// CRLF
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AppendLinebreak(dst, aDestBreak);
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src++;
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} else {
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// Lone CR
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AppendLinebreak(dst, aDestBreak);
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}
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} else if (*src == nsCRT::LF) {
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// Lone LF
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AppendLinebreak(dst, aDestBreak);
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} else {
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*dst++ = *src;
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}
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src++;
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}
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aIoLen = 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*
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nsLinebreakConverter::ConvertLineBreaks(const char* aSrc,
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ELinebreakType aSrcBreaks,
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ELinebreakType aDestBreaks,
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int32_t aSrcLen, int32_t* aOutLen)
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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) {
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return nullptr;
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}
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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,
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GetLinebreakString(aDestBreaks));
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} else
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resultString = ConvertBreaks(aSrc, sourceLen,
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GetLinebreakString(aSrcBreaks),
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GetLinebreakString(aDestBreaks));
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if (aOutLen) {
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*aOutLen = sourceLen;
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}
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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
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nsLinebreakConverter::ConvertLineBreaksInSitu(char** aIoBuffer,
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ELinebreakType aSrcBreaks,
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ELinebreakType aDestBreaks,
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int32_t aSrcLen, int32_t* aOutLen)
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{
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NS_ASSERTION(aIoBuffer && *aIoBuffer, "Null pointer passed");
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if (!aIoBuffer || !*aIoBuffer) {
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return NS_ERROR_NULL_POINTER;
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}
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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(*aIoBuffer) + 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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ConvertBreaksInSitu(*aIoBuffer, sourceLen, *srcBreaks, *dstBreaks);
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if (aOutLen) {
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*aOutLen = sourceLen;
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}
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} else {
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char* destBuffer;
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if (aSrcBreaks == eLinebreakAny) {
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destBuffer = ConvertUnknownBreaks(*aIoBuffer, sourceLen, dstBreaks);
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} else {
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destBuffer = ConvertBreaks(*aIoBuffer, sourceLen, srcBreaks, dstBreaks);
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}
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if (!destBuffer) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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*aIoBuffer = destBuffer;
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if (aOutLen) {
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*aOutLen = sourceLen;
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}
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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*
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nsLinebreakConverter::ConvertUnicharLineBreaks(const char16_t* aSrc,
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ELinebreakType aSrcBreaks,
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ELinebreakType aDestBreaks,
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int32_t aSrcLen,
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int32_t* aOutLen)
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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) {
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return nullptr;
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}
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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,
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GetLinebreakString(aDestBreaks));
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} else
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resultString = ConvertBreaks(aSrc, bufLen, GetLinebreakString(aSrcBreaks),
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GetLinebreakString(aDestBreaks));
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if (aOutLen) {
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*aOutLen = bufLen;
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}
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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
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nsLinebreakConverter::ConvertUnicharLineBreaksInSitu(
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char16_t** aIoBuffer, ELinebreakType aSrcBreaks, ELinebreakType aDestBreaks,
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int32_t aSrcLen, int32_t* aOutLen)
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{
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NS_ASSERTION(aIoBuffer && *aIoBuffer, "Null pointer passed");
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if (!aIoBuffer || !*aIoBuffer) {
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return NS_ERROR_NULL_POINTER;
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}
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NS_ASSERTION(aDestBreaks != eLinebreakAny &&
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aSrcBreaks != eLinebreakSpace, "Invalid parameter");
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int32_t sourceLen =
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(aSrcLen == kIgnoreLen) ? NS_strlen(*aIoBuffer) + 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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ConvertBreaksInSitu(*aIoBuffer, sourceLen, *srcBreaks, *dstBreaks);
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if (aOutLen) {
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*aOutLen = sourceLen;
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}
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} else {
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char16_t* destBuffer;
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if (aSrcBreaks == eLinebreakAny) {
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destBuffer = ConvertUnknownBreaks(*aIoBuffer, sourceLen, dstBreaks);
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} else {
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destBuffer = ConvertBreaks(*aIoBuffer, sourceLen, srcBreaks, dstBreaks);
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}
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if (!destBuffer) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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*aIoBuffer = destBuffer;
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if (aOutLen) {
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*aOutLen = sourceLen;
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}
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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
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nsLinebreakConverter::ConvertStringLineBreaks(nsString& aIoString,
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ELinebreakType aSrcBreaks,
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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 (aIoString.IsEmpty()) {
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return NS_OK;
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}
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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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aIoString.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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aIoString.Length() + 1, &newLen);
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if (NS_FAILED(rv)) {
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return rv;
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}
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if (stringBuf != aIoString.get()) {
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aIoString.Adopt(stringBuf);
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}
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return NS_OK;
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}
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