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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * MODULE NOTES:
+ *
+ * This class does two primary jobs:
+ * 1) It iterates the tokens provided during the
+ * tokenization process, identifing where elements
+ * begin and end (doing validation and normalization).
+ * 2) It controls and coordinates with an instance of
+ * the IContentSink interface, to coordinate the
+ * the production of the content model.
+ *
+ * The basic operation of this class assumes that an HTML
+ * document is non-normalized. Therefore, we don't process
+ * the document in a normalized way. Don't bother to look
+ * for methods like: doHead() or doBody().
+ *
+ * Instead, in order to be backward compatible, we must
+ * scan the set of tokens and perform this basic set of
+ * operations:
+ * 1) Determine the token type (easy, since the tokens know)
+ * 2) Determine the appropriate section of the HTML document
+ * each token belongs in (HTML,HEAD,BODY,FRAMESET).
+ * 3) Insert content into our document (via the sink) into
+ * the correct section.
+ * 4) In the case of tags that belong in the BODY, we must
+ * ensure that our underlying document state reflects
+ * the appropriate context for our tag.
+ *
+ * For example,if we see a <TR>, we must ensure our
+ * document contains a table into which the row can
+ * be placed. This may result in "implicit containers"
+ * created to ensure a well-formed document.
+ *
+ */
+
+#ifndef NS_PARSER__
+#define NS_PARSER__
+
+#include "nsIParser.h"
+#include "nsDeque.h"
+#include "CParserContext.h"
+#include "nsHTMLTags.h"
+#include "nsIContentSink.h"
+#include "nsCOMArray.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsWeakReference.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/UniquePtr.h"
+
+class nsIDTD;
+class nsIRunnable;
+
+#ifdef _MSC_VER
+# pragma warning(disable : 4275)
+#endif
+
+class nsParser final : public nsIParser,
+ public nsIStreamListener,
+ public nsSupportsWeakReference {
+ /**
+ * Destructor
+ * @update gess5/11/98
+ */
+ virtual ~nsParser();
+
+ public:
+ /**
+ * Called on module init
+ */
+ static nsresult Init();
+
+ /**
+ * Called on module shutdown
+ */
+ static void Shutdown();
+
+ NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+ NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(nsParser, nsIParser)
+
+ /**
+ * default constructor
+ * @update gess5/11/98
+ */
+ nsParser();
+
+ /**
+ * Select given content sink into parser for parser output
+ * @update gess5/11/98
+ * @param aSink is the new sink to be used by parser
+ * @return old sink, or nullptr
+ */
+ NS_IMETHOD_(void) SetContentSink(nsIContentSink* aSink) override;
+
+ /**
+ * retrive the sink set into the parser
+ * @update gess5/11/98
+ * @param aSink is the new sink to be used by parser
+ * @return old sink, or nullptr
+ */
+ NS_IMETHOD_(nsIContentSink*) GetContentSink(void) override;
+
+ /**
+ * Call this method once you've created a parser, and want to instruct it
+ * about the command which caused the parser to be constructed. For example,
+ * this allows us to select a DTD which can do, say, view-source.
+ *
+ * @update gess 3/25/98
+ * @param aCommand -- ptrs to string that contains command
+ * @return nada
+ */
+ NS_IMETHOD_(void) GetCommand(nsCString& aCommand) override;
+ NS_IMETHOD_(void) SetCommand(const char* aCommand) override;
+ NS_IMETHOD_(void) SetCommand(eParserCommands aParserCommand) override;
+
+ /**
+ * Call this method once you've created a parser, and want to instruct it
+ * about what charset to load
+ *
+ * @update ftang 4/23/99
+ * @param aCharset- the charset of a document
+ * @param aCharsetSource- the source of the charset
+ * @param aChannelHadCharset- ignored
+ * @return nada
+ */
+ virtual void SetDocumentCharset(NotNull<const Encoding*> aCharset,
+ int32_t aSource,
+ bool aForceAutoDetection) override;
+
+ NotNull<const Encoding*> GetDocumentCharset(int32_t& aSource) {
+ aSource = mCharsetSource;
+ return mCharset;
+ }
+
+ /**
+ * Cause parser to parse input from given URL
+ */
+ NS_IMETHOD Parse(nsIURI* aURL) override;
+
+ /**
+ * This method gets called when you want to parse a fragment of XML surrounded
+ * by the context |aTagStack|. It requires that the parser have been given a
+ * fragment content sink.
+ *
+ * @param aSourceBuffer The XML that hasn't been parsed yet.
+ * @param aTagStack The context of the source buffer.
+ */
+ nsresult ParseFragment(const nsAString& aSourceBuffer,
+ nsTArray<nsString>& aTagStack);
+
+ NS_IMETHOD ContinueInterruptedParsing() override;
+ NS_IMETHOD_(void) BlockParser() override;
+ NS_IMETHOD_(void) UnblockParser() override;
+ NS_IMETHOD_(void) ContinueInterruptedParsingAsync() override;
+ NS_IMETHOD Terminate(void) override;
+
+ /**
+ * Call this to query whether the parser is enabled or not.
+ *
+ * @update vidur 4/12/99
+ * @return current state
+ */
+ NS_IMETHOD_(bool) IsParserEnabled() override;
+
+ /**
+ * Call this to query whether the parser thinks it's done with parsing.
+ *
+ * @update rickg 5/12/01
+ * @return complete state
+ */
+ NS_IMETHOD_(bool) IsComplete() override;
+
+ /**
+ * This method gets called (automatically) during incremental parsing
+ * @update gess5/11/98
+ * @return TRUE if all went well, otherwise FALSE
+ */
+ virtual nsresult ResumeParse(bool allowIteration = true,
+ bool aIsFinalChunk = false,
+ bool aCanInterrupt = true);
+
+ //*********************************************
+ // These methods are callback methods used by
+ // net lib to let us know about our inputstream.
+ //*********************************************
+ // nsIRequestObserver methods:
+ NS_DECL_NSIREQUESTOBSERVER
+
+ // nsIStreamListener methods:
+ NS_DECL_NSISTREAMLISTENER
+
+ /**
+ * Get the nsIStreamListener for this parser
+ */
+ virtual nsIStreamListener* GetStreamListener() override;
+
+ void SetSinkCharset(NotNull<const Encoding*> aCharset);
+
+ /**
+ * Return true.
+ */
+ virtual bool IsInsertionPointDefined() override;
+
+ /**
+ * No-op.
+ */
+ void IncrementScriptNestingLevel() final;
+
+ /**
+ * No-op.
+ */
+ void DecrementScriptNestingLevel() final;
+
+ bool HasNonzeroScriptNestingLevel() const final;
+
+ /**
+ * Always false.
+ */
+ virtual bool IsScriptCreated() override;
+
+ /**
+ * This is called when the final chunk has been
+ * passed to the parser and the content sink has
+ * interrupted token processing. It schedules
+ * a ParserContinue PL_Event which will ask the parser
+ * to HandleParserContinueEvent when it is handled.
+ * @update kmcclusk6/1/2001
+ */
+ nsresult PostContinueEvent();
+
+ /**
+ * Fired when the continue parse event is triggered.
+ * @update kmcclusk 5/18/98
+ */
+ void HandleParserContinueEvent(class nsParserContinueEvent*);
+
+ void Reset() {
+ Cleanup();
+ mUnusedInput.Truncate();
+ Initialize();
+ }
+
+ bool IsScriptExecuting() { return mSink && mSink->IsScriptExecuting(); }
+
+ bool IsOkToProcessNetworkData() {
+ return !IsScriptExecuting() && !mProcessingNetworkData;
+ }
+
+ // Returns Nothing() if we haven't determined yet what the parser is being
+ // used for. Else returns whether this parser is used for parsing XML.
+ mozilla::Maybe<bool> IsForParsingXML() {
+ if (!mParserContext || mParserContext->mDTDMode == eDTDMode_autodetect) {
+ return mozilla::Nothing();
+ }
+
+ return mozilla::Some(mParserContext->mDocType == eXML);
+ }
+
+ protected:
+ void Initialize();
+ void Cleanup();
+
+ /**
+ *
+ * @update gess5/18/98
+ * @param
+ * @return
+ */
+ nsresult WillBuildModel();
+
+ /**
+ * Called when parsing is done.
+ */
+ void DidBuildModel();
+
+ private:
+ /**
+ * Pushes XML fragment parsing data to expat without an input stream.
+ */
+ nsresult Parse(const nsAString& aSourceBuffer, bool aLastCall);
+
+ protected:
+ //*********************************************
+ // And now, some data members...
+ //*********************************************
+
+ mozilla::UniquePtr<CParserContext> mParserContext;
+ nsCOMPtr<nsIDTD> mDTD;
+ nsCOMPtr<nsIContentSink> mSink;
+ nsIRunnable* mContinueEvent; // weak ref
+
+ eParserCommands mCommand;
+ nsresult mInternalState;
+ nsresult mStreamStatus;
+ int32_t mCharsetSource;
+
+ uint16_t mFlags;
+ uint32_t mBlocked;
+
+ nsString mUnusedInput;
+ NotNull<const Encoding*> mCharset;
+ nsCString mCommandStr;
+
+ bool mProcessingNetworkData;
+ bool mIsAboutBlank;
+};
+
+#endif
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