mirror of
https://github.com/mozilla/gecko-dev.git
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370 lines
8.9 KiB
C++
370 lines
8.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Communicator client code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsTextFragment.h"
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#include "nsString.h"
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#include "nsCRT.h"
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#include "nsReadableUtils.h"
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#include "nsMemory.h"
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#include "nsBidiUtils.h"
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#include "nsUnicharUtils.h"
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// Static buffer used for newline fragments
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static unsigned char sNewLineCharacter = '\n';
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nsTextFragment::~nsTextFragment()
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{
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ReleaseText();
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}
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void
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nsTextFragment::ReleaseText()
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{
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if (mState.mLength && m1b && mState.mInHeap) {
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unsigned char *buf = NS_CONST_CAST(unsigned char *, m1b);
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nsMemory::Free(buf); // m1b == m2b as far as nsMemory is concerned
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}
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m1b = nsnull;
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// Set mState.mIs2b, mState.mInHeap, and mState.mLength = 0 with mAllBits;
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mAllBits = 0;
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}
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nsTextFragment::nsTextFragment(const nsTextFragment& aOther)
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: m1b(nsnull), mAllBits(0)
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{
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if (aOther.Is2b()) {
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SetTo(aOther.Get2b(), aOther.GetLength());
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} else {
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SetTo(aOther.Get1b(), aOther.GetLength());
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}
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}
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nsTextFragment::nsTextFragment(const char *aString)
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: m1b(nsnull), mAllBits(0)
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{
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SetTo(aString, strlen(aString));
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}
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nsTextFragment::nsTextFragment(const PRUnichar *aString)
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: m1b(nsnull), mAllBits(0)
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{
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SetTo(aString, nsCRT::strlen(aString));
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}
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nsTextFragment::nsTextFragment(const nsString& aString)
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: m1b(nsnull), mAllBits(0)
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{
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SetTo(aString.get(), aString.Length());
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}
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nsTextFragment&
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nsTextFragment::operator=(const nsTextFragment& aOther)
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{
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if (aOther.Is2b()) {
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SetTo(aOther.Get2b(), aOther.GetLength());
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} else {
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SetTo(aOther.Get1b(), aOther.GetLength());
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}
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if (aOther.mState.mIsBidi) {
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// Carry over BIDI state from aOther
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mState.mIsBidi = PR_TRUE;
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}
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return *this;
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}
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nsTextFragment&
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nsTextFragment::operator=(const char *aString)
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{
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SetTo(aString, strlen(aString));
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return *this;
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}
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nsTextFragment&
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nsTextFragment::operator=(const PRUnichar *aString)
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{
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SetTo(aString, nsCRT::strlen(aString));
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return *this;
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}
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nsTextFragment&
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nsTextFragment::operator=(const nsAString& aString)
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{
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ReleaseText();
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PRUint32 length = aString.Length();
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if (length > 0) {
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PRBool in_heap = PR_TRUE;
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if (IsASCII(aString)) {
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if (length == 1 && aString.First() == '\n') {
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m1b = &sNewLineCharacter;
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in_heap = PR_FALSE;
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} else {
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m1b = (unsigned char *)ToNewCString(aString);
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}
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mState.mIs2b = PR_FALSE;
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} else {
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m2b = ToNewUnicode(aString);
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mState.mIs2b = PR_TRUE;
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}
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mState.mInHeap = in_heap;
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mState.mLength = length;
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}
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return *this;
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}
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void
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nsTextFragment::SetTo(PRUnichar *aBuffer, PRInt32 aLength, PRBool aRelease)
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{
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ReleaseText();
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m2b = aBuffer;
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mState.mIs2b = PR_TRUE;
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mState.mInHeap = aRelease;
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mState.mLength = aLength;
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}
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void
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nsTextFragment::SetTo(const PRUnichar* aBuffer, PRInt32 aLength)
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{
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ReleaseText();
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if (aLength != 0) {
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// See if we need to store the data in ucs2 or not
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PRBool need2 = PR_FALSE;
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const PRUnichar *ucp = aBuffer;
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const PRUnichar *uend = aBuffer + aLength;
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while (ucp < uend) {
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PRUnichar ch = *ucp++;
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if (ch >> 8) {
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need2 = PR_TRUE;
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break;
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}
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}
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if (need2) {
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// Use ucs2 storage because we have to
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m2b = (const PRUnichar *)nsMemory::Clone(aBuffer,
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aLength * sizeof(PRUnichar));
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if (!m2b) {
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NS_ERROR("Failed to clone string buffer!");
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return;
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}
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// Setup our fields
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mState.mIs2b = PR_TRUE;
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mState.mInHeap = PR_TRUE;
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mState.mLength = aLength;
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} else {
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// Use 1 byte storage because we can
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PRBool in_heap = PR_TRUE;
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if (aLength == 1 && *aBuffer == '\n') {
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m1b = &sNewLineCharacter;
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in_heap = PR_FALSE;
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} else {
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unsigned char *nt =
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(unsigned char *)nsMemory::Alloc(aLength * sizeof(char));
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if (!nt) {
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NS_ERROR("Failed to allocate string buffer!");
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return;
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}
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// Copy data
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for (PRUint32 i = 0; i < (PRUint32)aLength; ++i) {
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nt[i] = (unsigned char)aBuffer[i];
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}
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m1b = nt;
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}
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// Setup our fields
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mState.mIs2b = PR_FALSE;
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mState.mInHeap = in_heap;
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mState.mLength = aLength;
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}
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}
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}
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void
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nsTextFragment::SetTo(const char *aBuffer, PRInt32 aLength)
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{
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ReleaseText();
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if (aLength != 0) {
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PRBool in_heap = PR_TRUE;
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if (aLength == 1 && *aBuffer == '\n') {
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m1b = &sNewLineCharacter;
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in_heap = PR_FALSE;
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} else {
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m1b = (unsigned char *)nsMemory::Clone(aBuffer, aLength * sizeof(char));
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if (!m1b) {
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NS_ERROR("Failed to allocate string buffer!");
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return;
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}
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}
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// Setup our fields
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mState.mIs2b = PR_FALSE;
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mState.mInHeap = in_heap;
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mState.mLength = aLength;
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}
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}
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void
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nsTextFragment::AppendTo(nsAString& aString) const
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{
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if (mState.mIs2b) {
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aString.Append(m2b, mState.mLength);
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} else {
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AppendASCIItoUTF16(Substring((char *)m1b, ((char *)m1b) + mState.mLength),
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aString);
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}
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}
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void
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nsTextFragment::AppendTo(nsACString& aCString) const
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{
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if (mState.mIs2b) {
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LossyAppendUTF16toASCII(Substring((PRUnichar *)m2b,
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(PRUnichar *)m2b + mState.mLength),
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aCString);
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} else {
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aCString.Append((char *)m1b, mState.mLength);
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}
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}
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void
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nsTextFragment::CopyTo(PRUnichar *aDest, PRInt32 aOffset, PRInt32 aCount)
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{
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NS_ASSERTION(aOffset >= 0, "Bad offset passed to nsTextFragment::CopyTo()!");
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NS_ASSERTION(aCount >= 0, "Bad count passed to nsTextFragment::CopyTo()!");
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if (aOffset < 0) {
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aOffset = 0;
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}
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if (aOffset + aCount > GetLength()) {
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aCount = mState.mLength - aOffset;
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}
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if (aCount != 0) {
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if (mState.mIs2b) {
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memcpy(aDest, m2b + aOffset, sizeof(PRUnichar) * aCount);
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} else {
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unsigned const char *cp = m1b + aOffset;
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unsigned const char *end = cp + aCount;
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while (cp < end) {
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*aDest++ = PRUnichar(*cp++);
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}
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}
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}
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}
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void
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nsTextFragment::CopyTo(char *aDest, PRInt32 aOffset, PRInt32 aCount)
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{
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NS_ASSERTION(aOffset >= 0, "Bad offset passed to nsTextFragment::CopyTo()!");
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NS_ASSERTION(aCount >= 0, "Bad count passed to nsTextFragment::CopyTo()!");
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if (aOffset < 0) {
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aOffset = 0;
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}
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if (aOffset + aCount > GetLength()) {
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aCount = mState.mLength - aOffset;
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}
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if (aCount != 0) {
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if (mState.mIs2b) {
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const PRUnichar *cp = m2b + aOffset;
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const PRUnichar *end = cp + aCount;
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while (cp < end) {
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*aDest++ = (char)(*cp++);
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}
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} else {
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memcpy(aDest, m1b + aOffset, sizeof(char) * aCount);
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}
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}
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}
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// To save time we only do this when we really want to know, not during
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// every allocation
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void
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nsTextFragment::SetBidiFlag()
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{
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if (mState.mIs2b && !mState.mIsBidi) {
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const PRUnichar* cp = m2b;
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const PRUnichar* end = cp + mState.mLength;
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while (cp < end) {
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PRUnichar ch1 = *cp++;
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PRUint32 utf32Char = ch1;
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if (IS_HIGH_SURROGATE(ch1) &&
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cp < end &&
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IS_LOW_SURROGATE(*cp)) {
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PRUnichar ch2 = *cp++;
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utf32Char = SURROGATE_TO_UCS4(ch1, ch2);
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}
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if (UTF32_CHAR_IS_BIDI(utf32Char) || IS_BIDI_CONTROL_CHAR(utf32Char)) {
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mState.mIsBidi = PR_TRUE;
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break;
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}
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}
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}
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}
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