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399 lines
10 KiB
C++
399 lines
10 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS IS"
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* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
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* the License for the specific language governing rights and limitations
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* under the 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 Netscape Communications
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* Corporation. Portions created by Netscape are Copyright (C) 1998
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* Netscape Communications Corporation. All Rights Reserved.
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*/
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#include "nsTextTransformer.h"
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#include "nsIContent.h"
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#include "nsIFrame.h"
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#include "nsIStyleContext.h"
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#include "nsITextContent.h"
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#include "nsStyleConsts.h"
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// XXX put a copy in nsHTMLIIDs
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static NS_DEFINE_IID(kITextContentIID, NS_ITEXT_CONTENT_IID);
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// XXX these need I18N spankage
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#define XP_IS_SPACE(_ch) \
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(((_ch) == ' ') || ((_ch) == '\t') || ((_ch) == '\n'))
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#define XP_IS_UPPERCASE(_ch) \
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(((_ch) >= 'A') && ((_ch) <= 'Z'))
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#define XP_IS_LOWERCASE(_ch) \
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(((_ch) >= 'a') && ((_ch) <= 'z'))
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#define XP_TO_LOWER(_ch) ((_ch) | 32)
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#define XP_TO_UPPER(_ch) ((_ch) & ~32)
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// XXX I'm sure there are other special characters
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#define CH_NBSP 160
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#define MAX_UNIBYTE 127
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nsTextTransformer::nsTextTransformer(PRUnichar* aBuffer, PRInt32 aBufLen)
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: mAutoBuffer(aBuffer),
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mBuffer(aBuffer),
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mBufferLength(aBufLen < 0 ? 0 : aBufLen),
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mHasMultibyte(PR_FALSE)
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{
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}
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nsTextTransformer::~nsTextTransformer()
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{
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if (mBuffer != mAutoBuffer) {
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delete [] mBuffer;
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}
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}
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nsresult
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nsTextTransformer::Init(/*nsTextRun& aTextRun, XXX*/
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nsIFrame* aFrame,
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PRInt32 aStartingOffset)
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{
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// Make sure we have *some* space in case arguments to the ctor were
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// bizzare.
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if (mBufferLength < 100) {
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if (!GrowBuffer()) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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}
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// Get the frames text content
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nsIContent* content;
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aFrame->GetContent(content);
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nsITextContent* tc;
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if (NS_OK != content->QueryInterface(kITextContentIID, (void**) &tc)) {
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NS_RELEASE(content);
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return NS_OK;
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}
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tc->GetText(mFrags, mNumFrags);
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NS_RELEASE(tc);
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NS_RELEASE(content);
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mStartingOffset = aStartingOffset;
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mOffset = mStartingOffset;
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// Compute the total length of the text content.
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PRInt32 sum = 0;
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PRInt32 n = mNumFrags;
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const nsTextFragment* frag = mFrags;
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for (; --n >= 0; frag++) {
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sum += frag->GetLength();
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}
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mContentLength = sum;
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// Set current fragment and current fragment offset
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mCurrentFrag = mFrags;
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mCurrentFragOffset = 0;
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PRInt32 offset = 0;
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n = mNumFrags;
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for (frag = mFrags; --n >= 0; frag++) {
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if (aStartingOffset < offset + frag->GetLength()) {
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mCurrentFrag = frag;
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mCurrentFragOffset = aStartingOffset - offset;
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break;
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}
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offset += frag->GetLength();
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}
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// Get the frames style and choose a transform proc
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const nsStyleText* styleText;
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aFrame->GetStyleData(eStyleStruct_Text, (const nsStyleStruct*&) styleText);
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mWhiteSpace = styleText->mWhiteSpace;
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mTextTransform = styleText->mTextTransform;
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return NS_OK;
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}
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PRBool
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nsTextTransformer::GrowBuffer()
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{
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PRInt32 newLen = mBufferLength * 2;
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if (newLen <= 100) {
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newLen = 100;
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}
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PRUnichar* newBuffer = new PRUnichar[newLen];
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if (nsnull == newBuffer) {
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return PR_FALSE;
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}
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if (0 != mBufferLength) {
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nsCRT::memcpy(newBuffer, mBuffer, sizeof(PRUnichar) * mBufferLength);
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if (mBuffer != mAutoBuffer) {
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delete [] mBuffer;
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}
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}
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mBuffer = newBuffer;
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return PR_TRUE;
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}
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PRUnichar*
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nsTextTransformer::GetNextWord(PRBool aInWord,
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PRInt32& aWordLenResult,
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PRInt32& aContentLenResult,
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PRBool& aIsWhitespaceResult)
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{
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NS_PRECONDITION(mOffset <= mContentLength, "bad offset");
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// See if the content has been exhausted
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if (mOffset == mContentLength) {
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aWordLenResult = 0;
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aContentLenResult = 0;
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return nsnull;
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}
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PRUnichar* bp = mBuffer;
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PRUnichar* bufEnd = mBuffer + mBufferLength;
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const nsTextFragment* frag = mCurrentFrag;
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const nsTextFragment* lastFrag = mFrags + mNumFrags;
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PRInt32 wordLen = 1;
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PRInt32 contentLen = 1;
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// Set the isWhitespace flag by examining the next character in the
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// text fragment.
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PRInt32 offset = mCurrentFragOffset;
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PRUnichar firstChar;
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if (frag->Is2b()) {
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const PRUnichar* up = frag->Get2b();
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firstChar = up[offset];
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}
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else {
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const unsigned char* cp = (const unsigned char*) frag->Get1b();
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firstChar = PRUnichar(cp[offset]);
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}
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PRBool isWhitespace = XP_IS_SPACE(firstChar);
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offset++;
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if (isWhitespace) {
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if (NS_STYLE_WHITESPACE_PRE == mWhiteSpace) {
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if ('\t' == firstChar) {
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// Leave tab alone so that caller can expand it
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}
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else if ('\n' == firstChar) {
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// Advance content past newline but do not allow newline to
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// remain in the word.
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wordLen--;
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}
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else {
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firstChar = ' ';
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}
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}
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else {
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firstChar = ' ';
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}
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}
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else if (CH_NBSP == firstChar) {
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firstChar = ' ';
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}
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else {
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switch (mTextTransform) {
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case NS_STYLE_TEXT_TRANSFORM_LOWERCASE:
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if (XP_IS_UPPERCASE(firstChar)) {
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firstChar = XP_TO_LOWER(firstChar);
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}
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break;
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case NS_STYLE_TEXT_TRANSFORM_UPPERCASE:
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if (XP_IS_LOWERCASE(firstChar)) {
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firstChar = XP_TO_UPPER(firstChar);
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}
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break;
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}
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}
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*bp++ = firstChar;
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if (offset == frag->GetLength()) {
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mCurrentFrag = ++frag;
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offset = 0;
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}
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mCurrentFragOffset = offset;
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if (isWhitespace && (NS_STYLE_WHITESPACE_PRE == mWhiteSpace)) {
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goto really_done;
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}
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PRInt32 numChars;
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while (frag < lastFrag) {
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PRInt32 fragLen = frag->GetLength();
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// Scan characters in this fragment that are the same kind as the
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// isWhitespace flag indicates.
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if (frag->Is2b()) {
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const PRUnichar* cp0 = frag->Get2b();
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const PRUnichar* end = cp0 + fragLen;
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const PRUnichar* cp = cp0 + offset;
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if (isWhitespace) {
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while (cp < end) {
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PRUnichar ch = *cp;
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if (XP_IS_SPACE(ch)) {
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cp++;
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continue;
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}
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numChars = (cp - offset) - cp0;
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contentLen += numChars;
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mCurrentFragOffset += numChars;
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goto done;
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}
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numChars = (cp - offset) - cp0;
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contentLen += numChars;
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}
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else {
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while (cp < end) {
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PRUnichar ch = *cp;
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if (!XP_IS_SPACE(ch)) {
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if (CH_NBSP == ch) ch = ' ';
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if (ch > MAX_UNIBYTE) mHasMultibyte = PR_TRUE;
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cp++;
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switch (mTextTransform) {
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case NS_STYLE_TEXT_TRANSFORM_LOWERCASE:
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if (XP_IS_UPPERCASE(ch)) {
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ch = XP_TO_LOWER(ch);
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}
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break;
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case NS_STYLE_TEXT_TRANSFORM_UPPERCASE:
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if (XP_IS_LOWERCASE(ch)) {
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ch = XP_TO_UPPER(ch);
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}
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break;
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}
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// Store character in buffer; grow buffer if we have to
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*bp++ = ch;
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if (bp == bufEnd) {
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PRInt32 delta = bp - mBuffer;
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if (!GrowBuffer()) {
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goto done;
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}
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bp = mBuffer + delta;
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bufEnd = mBuffer + mBufferLength;
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}
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continue;
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}
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numChars = (cp - offset) - cp0;
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wordLen += numChars;
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contentLen += numChars;
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mCurrentFragOffset += numChars;
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goto done;
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}
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numChars = (cp - offset) - cp0;
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wordLen += numChars;
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contentLen += numChars;
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}
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}
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else {
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const unsigned char* cp0 = (const unsigned char*) frag->Get1b();
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const unsigned char* end = cp0 + fragLen;
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const unsigned char* cp = cp0 + offset;
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if (isWhitespace) {
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while (cp < end) {
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PRUnichar ch = PRUnichar(*cp);
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if (XP_IS_SPACE(ch)) {
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cp++;
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continue;
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}
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numChars = (cp - offset) - cp0;
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contentLen += numChars;
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mCurrentFragOffset += numChars;
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goto done;
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}
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numChars = (cp - offset) - cp0;
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contentLen += numChars;
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}
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else {
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while (cp < end) {
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PRUnichar ch = PRUnichar(*cp);
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if (!XP_IS_SPACE(ch)) {
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if (CH_NBSP == ch) ch = ' ';
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if (ch > MAX_UNIBYTE) mHasMultibyte = PR_TRUE;
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cp++;
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switch (mTextTransform) {
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case NS_STYLE_TEXT_TRANSFORM_LOWERCASE:
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if (XP_IS_UPPERCASE(ch)) {
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ch = XP_TO_LOWER(ch);
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}
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break;
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case NS_STYLE_TEXT_TRANSFORM_UPPERCASE:
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if (XP_IS_LOWERCASE(ch)) {
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ch = XP_TO_UPPER(ch);
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}
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break;
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}
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// Store character in buffer; grow buffer if we have to
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*bp++ = ch;
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if (bp == bufEnd) {
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PRInt32 delta = bp - mBuffer;
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if (!GrowBuffer()) {
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goto done;
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}
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bp = mBuffer + delta;
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bufEnd = mBuffer + mBufferLength;
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}
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continue;
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}
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numChars = (cp - offset) - cp0;
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wordLen += numChars;
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contentLen += numChars;
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mCurrentFragOffset += numChars;
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goto done;
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}
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numChars = (cp - offset) - cp0;
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wordLen += numChars;
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contentLen += numChars;
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}
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}
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// Advance to next text fragment
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frag++;
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mCurrentFrag = frag;
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mCurrentFragOffset = 0;
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offset = 0;
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}
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done:;
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if (!aInWord && !isWhitespace &&
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(NS_STYLE_TEXT_TRANSFORM_CAPITALIZE == mTextTransform)) {
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PRInt32 n = wordLen;
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PRUnichar* bp = mBuffer;
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for (; --n >= 0; bp++) {
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PRUnichar ch = *bp;
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if (' ' == ch) {
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// Skip over NBSP's that were mapped to space
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continue;
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}
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if (XP_IS_LOWERCASE(ch)) {
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*bp = XP_TO_UPPER(ch);
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}
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break;
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}
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}
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really_done:;
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mOffset += contentLen;
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NS_ASSERTION(mOffset <= mContentLength, "whoops");
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aWordLenResult = wordLen;
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aContentLenResult = contentLen;
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aIsWhitespaceResult = isWhitespace;
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return mBuffer;
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}
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PRUnichar*
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nsTextTransformer::GetTextAt(PRInt32 aOffset)
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{
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// XXX
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return mBuffer + aOffset;
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}
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