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310 lines
9.9 KiB
C++
310 lines
9.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/**
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* MODULE NOTES:
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* @update gess 4/1/98
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*
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* The scanner is a low-level service class that knows
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* how to consume characters out of an (internal) stream.
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* This class also offers a series of utility methods
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* that most tokenizers want, such as readUntil()
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* and SkipWhitespace().
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*/
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#ifndef SCANNER
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#define SCANNER
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#include "nsCOMPtr.h"
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#include "nsString.h"
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#include "nsIParser.h"
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#include "nsIUnicodeDecoder.h"
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#include "nsScannerString.h"
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class nsParser;
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class nsReadEndCondition {
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public:
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const char16_t *mChars;
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char16_t mFilter;
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explicit nsReadEndCondition(const char16_t* aTerminateChars);
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private:
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nsReadEndCondition(const nsReadEndCondition& aOther); // No copying
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void operator=(const nsReadEndCondition& aOther); // No assigning
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};
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class nsScanner {
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public:
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/**
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* Use this constructor for the XML fragment parsing case
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*/
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explicit nsScanner(const nsAString& anHTMLString);
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/**
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* Use this constructor if you want i/o to be based on
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* a file (therefore a stream) or just data you provide via Append().
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*/
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nsScanner(nsString& aFilename, bool aCreateStream);
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~nsScanner();
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/**
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* retrieve next char from internal input stream
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*
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* @update gess 3/25/98
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* @param ch is the char to accept new value
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* @return error code reflecting read status
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*/
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nsresult GetChar(char16_t& ch);
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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 ch is the char to accept new value
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* @return error code reflecting read status
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*/
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nsresult Peek(char16_t& ch, uint32_t aOffset=0);
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nsresult Peek(nsAString& aStr, int32_t aNumChars, int32_t aOffset = 0);
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/**
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* Skip over chars as long as they equal given char
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*
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* @update gess 3/25/98
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* @param char to be skipped
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* @return error code
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*/
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nsresult SkipOver(char16_t aSkipChar);
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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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* @return error status
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*/
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nsresult SkipWhitespace(int32_t& aNewlinesSkipped);
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/**
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* Consume characters until you run into space, a '<', a '>', or a '/'.
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*
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* @param aString - receives new data from stream
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* @return error code
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*/
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nsresult ReadTagIdentifier(nsScannerSharedSubstring& aString);
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/**
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* Consume characters until you run into a char that's not valid in an
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* entity name
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*
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* @param aString - receives new data from stream
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* @return error code
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*/
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nsresult ReadEntityIdentifier(nsString& aString);
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nsresult ReadNumber(nsString& aString,int32_t aBase);
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nsresult ReadWhitespace(nsScannerSharedSubstring& aString,
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int32_t& aNewlinesSkipped,
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bool& aHaveCR);
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nsresult ReadWhitespace(nsScannerIterator& aStart,
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nsScannerIterator& aEnd,
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int32_t& aNewlinesSkipped);
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/**
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* Consume characters until you find the terminal char
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*
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* @update gess 3/25/98
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* @param aString receives new data from stream
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* @param aTerminal contains terminating char
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* @param addTerminal tells us whether to append terminal to aString
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* @return error code
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*/
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nsresult ReadUntil(nsAString& aString,
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char16_t aTerminal,
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bool addTerminal);
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/**
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* Consume characters until you find one contained in given
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* terminal set.
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*
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* @update gess 3/25/98
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* @param aString receives new data from stream
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* @param aTermSet contains set of terminating chars
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* @param addTerminal tells us whether to append terminal to aString
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* @return error code
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*/
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nsresult ReadUntil(nsAString& aString,
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const nsReadEndCondition& aEndCondition,
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bool addTerminal);
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nsresult ReadUntil(nsScannerSharedSubstring& aString,
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const nsReadEndCondition& aEndCondition,
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bool addTerminal);
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nsresult ReadUntil(nsScannerIterator& aStart,
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nsScannerIterator& aEnd,
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const nsReadEndCondition& aEndCondition,
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bool addTerminal);
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/**
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* Records current offset position in input stream. This allows us
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* to back up to this point if the need should arise, such as when
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* tokenization gets interrupted.
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*
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* @update gess 5/12/98
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* @param
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* @return
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*/
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int32_t Mark(void);
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/**
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* Resets current offset position of input stream to marked position.
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* This allows us to back up to this point if the need should arise,
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* such as when tokenization gets interrupted.
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* NOTE: IT IS REALLY BAD FORM TO CALL RELEASE WITHOUT CALLING MARK FIRST!
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*
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* @update gess 5/12/98
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* @param
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* @return
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*/
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void RewindToMark(void);
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/**
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*
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*
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* @update harishd 01/12/99
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* @param
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* @return
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*/
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bool UngetReadable(const nsAString& aBuffer);
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/**
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*
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*
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* @update gess 5/13/98
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* @param
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* @return
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*/
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nsresult Append(const nsAString& aBuffer);
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/**
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*
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*
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* @update gess 5/21/98
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* @param
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* @return
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*/
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nsresult Append(const char* aBuffer, uint32_t aLen,
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nsIRequest *aRequest);
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/**
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* Call this to copy bytes out of the scanner that have not yet been consumed
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* by the tokenization process.
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*
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* @update gess 5/12/98
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* @param aCopyBuffer is where the scanner buffer will be copied to
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* @return nada
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*/
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void CopyUnusedData(nsString& aCopyBuffer);
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/**
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* Retrieve the name of the file that the scanner is reading from.
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* In some cases, it's just a given name, because the scanner isn't
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* really reading from a file.
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*
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* @update gess 5/12/98
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* @return
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*/
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nsString& GetFilename(void);
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static void SelfTest();
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/**
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* Use this setter to change the scanner's unicode decoder
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*
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* @update ftang 3/02/99
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* @param aCharset a normalized (alias resolved) charset name
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* @param aCharsetSource- where the charset info came from
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* @return
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*/
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nsresult SetDocumentCharset(const nsACString& aCharset, int32_t aSource);
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void BindSubstring(nsScannerSubstring& aSubstring, const nsScannerIterator& aStart, const nsScannerIterator& aEnd);
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void CurrentPosition(nsScannerIterator& aPosition);
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void EndReading(nsScannerIterator& aPosition);
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void SetPosition(nsScannerIterator& aPosition,
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bool aTruncate = false,
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bool aReverse = false);
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void ReplaceCharacter(nsScannerIterator& aPosition,
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char16_t aChar);
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/**
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* Internal method used to cause the internal buffer to
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* be filled with data.
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*
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* @update gess4/3/98
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*/
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bool IsIncremental(void) {return mIncremental;}
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void SetIncremental(bool anIncrValue) {mIncremental=anIncrValue;}
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/**
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* Return the position of the first non-whitespace
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* character. This is only reliable before consumers start
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* reading from this scanner.
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*/
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int32_t FirstNonWhitespacePosition()
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{
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return mFirstNonWhitespacePosition;
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}
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/**
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* Override replacement character used by nsIUnicodeDecoder.
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* Default behavior is that it uses nsIUnicodeDecoder's mapping.
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*
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* @param aReplacementCharacter the replacement character
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* XML (expat) parser uses 0xffff
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*/
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void OverrideReplacementCharacter(char16_t aReplacementCharacter);
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protected:
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bool AppendToBuffer(nsScannerString::Buffer *, nsIRequest *aRequest, int32_t aErrorPos = -1);
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bool AppendToBuffer(const nsAString& aStr)
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{
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nsScannerString::Buffer* buf = nsScannerString::AllocBufferFromString(aStr);
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if (!buf)
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return false;
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AppendToBuffer(buf, nullptr);
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return true;
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}
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nsScannerString* mSlidingBuffer;
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nsScannerIterator mCurrentPosition; // The position we will next read from in the scanner buffer
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nsScannerIterator mMarkPosition; // The position last marked (we may rewind to here)
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nsScannerIterator mEndPosition; // The current end of the scanner buffer
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nsScannerIterator mFirstInvalidPosition; // The position of the first invalid character that was detected
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nsString mFilename;
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uint32_t mCountRemaining; // The number of bytes still to be read
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// from the scanner buffer
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bool mIncremental;
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bool mHasInvalidCharacter;
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char16_t mReplacementCharacter;
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int32_t mFirstNonWhitespacePosition;
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int32_t mCharsetSource;
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nsCString mCharset;
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nsCOMPtr<nsIUnicodeDecoder> mUnicodeDecoder;
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private:
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nsScanner &operator =(const nsScanner &); // Not implemented.
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};
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#endif
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