moved to pub
git-svn-id: svn://10.0.0.236/trunk@165 18797224-902f-48f8-a5cc-f745e15eee43
This commit is contained in:
kipp
309
mozilla/parser/htmlparser/src/nsScanner.cpp
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309
mozilla/parser/htmlparser/src/nsScanner.cpp
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/* -*- 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 "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#include "nsScanner.h"
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#include "nsIURL.h"
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#include "nsDebug.h"
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const char* gURLRef;
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const char* kBadHTMLText1="<HTML><BODY><H3>Oops...</H3>You just tried to read a non-existent document: <BR>";
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const char* kBadHTMLText2="</BODY></HTML>";
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/**-------------------------------------------------------
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* default constructor
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*
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* @update gess 3/25/98
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* @param aURL -- pointer to URL to be loaded
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* @return
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*------------------------------------------------------*/
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CScanner::CScanner(nsIURL* aURL) : mBuffer("") {
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NS_ASSERTION(0!=aURL,"Error: Null URL!");
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mOffset=0;
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mStream=0;
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mTotalRead=0;
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if(aURL) {
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PRInt32 error;
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gURLRef=aURL->GetSpec();
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mStream=aURL->Open(&error);
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}
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}
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/**-------------------------------------------------------
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* default destructor
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*
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* @update gess 3/25/98
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* @param
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* @return
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*------------------------------------------------------*/
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CScanner::~CScanner() {
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mStream->Close();
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delete mStream;
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}
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/*-------------------------------------------------------
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*
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* @update gess4/3/98
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* @param
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* @return
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*------------------------------------------------------*/
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PRInt32 CScanner::FillBuffer(PRInt32& anError) {
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mBuffer.Cut(0,mBuffer.Length());
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if(!mStream) {
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//This is DEBUG code!!!!!! XXX DEBUG XXX
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//If you're here, it means someone tried to load a
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//non-existent document. So as a favor, we emit a
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//little bit of HTML explaining the error.
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if(0==mTotalRead) {
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mBuffer.Append((const char*)kBadHTMLText1);
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mBuffer.Append((const char*)gURLRef);
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mBuffer.Append((const char*)kBadHTMLText2);
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}
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else return 0;
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}
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else {
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anError=0;
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PRInt32 numread=0;
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char buf[64];
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buf[sizeof(buf)-1]=0;
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numread=mStream->Read(&anError,buf,0,sizeof(buf)-1);
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if((0<numread) && (0==anError))
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mBuffer.Append((const char*)buf,numread);
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}
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mTotalRead+=mBuffer.Length();
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return mBuffer.Length();
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}
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/**-------------------------------------------------------
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* determine if the scanner has reached EOF
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*
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* @update gess 3/25/98
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* @param
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* @return PR_TRUE upon eof condition
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*------------------------------------------------------*/
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PRBool CScanner::Eof() {
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PRInt32 theError=0;
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if(mOffset>=mBuffer.Length()) {
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PRInt32 numread=FillBuffer(theError);
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mOffset=0;
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}
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PRBool result=PR_TRUE;
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if(0==theError) {
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result=PRBool(0==mBuffer.Length());
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}
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else {
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result=PR_TRUE;
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}
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return result;
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}
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/**-------------------------------------------------------
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* retrieve next char from scanners internal input stream
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*
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* @update gess 3/25/98
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* @param
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* @return error code reflecting read status
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*------------------------------------------------------*/
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PRInt32 CScanner::GetChar(PRUnichar& aChar) {
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if(!Eof()) {
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aChar=mBuffer[mOffset++];
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return kNoError;
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}
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return kEOF;
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}
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/**-------------------------------------------------------
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* peek ahead to consume next char from scanner's internal
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* input buffer
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*
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* @update gess 3/25/98
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* @param
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* @return
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*------------------------------------------------------*/
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PRInt32 CScanner::Peek(PRUnichar& aChar){
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if(!Eof()) {
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aChar=mBuffer[mOffset];
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return kNoError;
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}
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return kEOF;
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}
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/**-------------------------------------------------------
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* Push the given char back onto the scanner
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*
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* @update gess 3/25/98
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* @param
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* @return error code
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*------------------------------------------------------*/
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PRInt32 CScanner::PutBack(PRUnichar aChar) {
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mOffset--;
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return kNoError;
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}
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/**-------------------------------------------------------
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* Skip whitespace on scanner input stream
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*
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* @update gess 3/25/98
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* @param
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* @return error status
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*------------------------------------------------------*/
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PRInt32 CScanner::SkipWhite(void) {
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static nsAutoString chars(" \n\r\t");
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return SkipOver(chars);
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}
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/**-------------------------------------------------------
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* Skip over chars as long as they're in aValidSet
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*
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* @update gess 3/25/98
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* @param
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* @return error code
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*------------------------------------------------------*/
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PRInt32 CScanner::SkipOver(nsString& aValidSet){
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PRUnichar ch=0;
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PRInt32 result=kNoError;
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while(kNoError==result) {
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result=GetChar(ch);
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if(!result) {
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PRInt32 pos=aValidSet.Find(ch);
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if(kNotFound==pos) {
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PutBack(ch);
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break;
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}
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}
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else break;
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} //while
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return result;
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}
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/**-------------------------------------------------------
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* Skip over chars as long as they're in aValidSet
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*
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* @update gess 3/25/98
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* @param
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* @return error code
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*------------------------------------------------------*/
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PRInt32 CScanner::SkipPast(nsString& aValidSet){
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NS_NOTYETIMPLEMENTED("Error: SkipPast not yet implemented.");
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return kNoError;
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}
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/**-------------------------------------------------------
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* Consume chars as long as they are <i>in</i> the
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* given validSet of input chars.
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*
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* @update gess 3/25/98
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* @param
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* @return error code
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*------------------------------------------------------*/
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PRInt32 CScanner::ReadWhile(nsString& aString,nsString& aValidSet,PRBool addTerminal){
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PRUnichar ch=0;
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PRInt32 result=kNoError;
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PRInt32 wrPos=0;
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while(kNoError==result) {
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result=GetChar(ch);
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if(kNoError==result) {
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PRInt32 pos=aValidSet.Find(ch);
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if(kNotFound==pos) {
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if(addTerminal)
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aString+=ch;
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else PutBack(ch);
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break;
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}
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else aString+=ch;
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}
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}
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return result;
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}
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/**-------------------------------------------------------
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* Consume characters until you find one contained in given
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* input set.
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*
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* @update gess 3/25/98
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* @param
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* @return error code
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*------------------------------------------------------*/
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PRInt32 CScanner::ReadUntil(nsString& aString,nsString& aTerminalSet,PRBool addTerminal){
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PRUnichar ch=0;
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PRInt32 result=kNoError;
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while(!Eof()) {
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result=GetChar(ch);
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if(kNoError==result) {
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PRInt32 pos=aTerminalSet.Find(ch);
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if(kNotFound!=pos) {
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if(addTerminal)
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aString+=ch;
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else PutBack(ch);
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break;
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}
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else aString+=ch;
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}
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}
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return result;
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}
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/**-------------------------------------------------------
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* Consumes chars until you see the given terminalChar
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*
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* @update gess 3/25/98
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* @param
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* @return error code
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*------------------------------------------------------*/
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PRInt32 CScanner::ReadUntil(nsString& aString,PRUnichar aTerminalChar,PRBool addTerminal){
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PRUnichar ch=0;
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PRInt32 result=kNoError;
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while(kNoError==result) {
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result=GetChar(ch);
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if(ch==aTerminalChar) {
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if(addTerminal)
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aString+=ch;
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else PutBack(ch);
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break;
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}
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else aString+=ch;
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}
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return result;
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}
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/**-------------------------------------------------------
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* Conduct self test. Actually, selftesting for this class
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* occurs in the parser selftest.
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*
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* @update gess 3/25/98
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* @param
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* @return
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*------------------------------------------------------*/
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void CScanner::SelfTest(void) {
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#ifdef _DEBUG
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#endif
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}
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