htmltokenizer.h

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/*
    This file is part of the KDE libraries

    Copyright (C) 1997 Martin Jones ([e-mail])
              (C) 1997 Torben Weis ([e-mail])
              (C) 1998 Waldo Bastian ([e-mail])
              (C) 2001 Dirk Mueller ([e-mail])
    Copyright (C) 2003 Apple Computer, Inc.

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    Boston, MA 02111-1307, USA.
*/
//----------------------------------------------------------------------------
//
// KDE HTML Widget -- Tokenizers

#ifndef HTMLTOKENIZER_H
#define HTMLTOKENIZER_H

#include <qstring.h>
#include <qobject.h>
#include <qptrqueue.h>

#include "misc/loader_client.h"
#include "misc/htmltags.h"
#include "xml/dom_stringimpl.h"
#include "xml/xml_tokenizer.h"
#include "html/html_elementimpl.h"
#include "xml/dom_docimpl.h"

#if APPLE_CHANGES
#ifdef __OBJC__
#define id id_AVOID_KEYWORD
#endif
#endif

class KCharsets;
class KHTMLParser;
class KHTMLView;

namespace DOM {
    class DocumentPtr;
    class DocumentFragmentImpl;
}

namespace khtml {

class CachedScript;


/**
 * @internal
 * represents one HTML tag. Consists of a numerical id, and the list
 * of attributes. Can also represent text. In this case the id = 0 and
 * text contains the text.
 */
class Token
OOM_MODIFIED
{
public:
    Token() {
        id = 0;
        attrs = 0;
        text = 0;
        flat = false;
        //qDebug("new token, creating %08lx", attrs);
    }
    ~Token() {
        if(attrs) attrs->deref();
        if(text) text->deref();
    }
    void addAttribute(DOM::DocumentImpl* doc, QChar* buffer, const QString& attrName, const DOM::AtomicString& v)
    {
        DOM::AttributeImpl* a = 0;
        if(buffer->unicode())
            a = new DOM::HTMLAttributeImpl(buffer->unicode(), v);
        else if ( !attrName.isEmpty() && attrName != "/" )
            a = new DOM::HTMLAttributeImpl(doc->attrId(0, DOM::DOMString(attrName).implementation(), false),
                                           v);

        if (a) {
            if(!attrs) {
                attrs = new DOM::HTMLNamedAttrMapImpl(0);
                if( !attrs ) return;
                attrs->ref();
            }
            attrs->insertAttribute(a);
        }
    }
    void reset()
    {
        if(attrs) {
            attrs->deref();
            attrs = 0;
        }
        id = 0;
        if(text) {
            text->deref();
            text = 0;
        }
        flat = false;
    }
    DOM::HTMLNamedAttrMapImpl* attrs;
    DOM::DOMStringImpl* text;
    ushort id;
    bool flat;
};

// The count of spaces used for each tab.
#define TAB_SIZE 8

//-----------------------------------------------------------------------------

class HTMLTokenizer : public Tokenizer, public CachedObjectClient
{
public:
    HTMLTokenizer(DOM::DocumentPtr *, KHTMLView * = 0, bool includesComments=false);
    HTMLTokenizer(DOM::DocumentPtr *, DOM::DocumentFragmentImpl *frag, bool includesComments=false);
    virtual ~HTMLTokenizer();

    virtual void write(const TokenizerString &str, bool appendData);
    virtual void finish();
    virtual void setOnHold(bool onHold);
    virtual void setForceSynchronous(bool force);
    virtual bool isWaitingForScripts() const;
    virtual void stopped();
    virtual bool processingData() const;

protected:
    void begin();
    void end();

    void reset();
    void addPending();
    void processToken();
    void processListing(TokenizerString list);

    void parseComment(TokenizerString &str);
    void parseServer(TokenizerString &str);
    void parseText(TokenizerString &str);
    void parseListing(TokenizerString &str);
    void parseSpecial(TokenizerString &str);
    void parseTag(TokenizerString &str);
    void parseEntity(TokenizerString &str, QChar *&dest, bool start = false);
    void parseProcessingInstruction(TokenizerString &str);
    void scriptHandler();
    void scriptExecution(const QString& script, QString scriptURL = QString(),
                         int baseLine = 0);
    void setSrc(const TokenizerString &source);

    // check if we have enough space in the buffer.
    // if not enlarge it
#if NOKIA_CHANGES && __OOM__
    inline bool checkBuffer(int len = 10)
    {
        if ( (dest - buffer) > size-len )
            return enlargeBuffer(len);
        return true;
    }
    inline bool checkScriptBuffer(int len = 10)
    {
        if ( scriptCodeSize + len >= scriptCodeMaxSize )
            return enlargeScriptBuffer(len);
        return true;
    }

    bool enlargeBuffer(int len);
    bool enlargeScriptBuffer(int len);
#else
    inline void checkBuffer(int len = 10)
    {
        if ( (dest - buffer) > size-len )
            enlargeBuffer(len);
    }
    inline void checkScriptBuffer(int len = 10)
    {
        if ( scriptCodeSize + len >= scriptCodeMaxSize )
            enlargeScriptBuffer(len);
    }

    void enlargeBuffer(int len);
    void enlargeScriptBuffer(int len);
#endif  // NOKIA_CHAGES && __OOM__


    bool continueProcessing(int& processedCount, const QTime& startTime, const KWQUIEventTime& eventTime);
    void timerEvent(QTimerEvent*);
    void allDataProcessed();

    // from CachedObjectClient
    void notifyFinished(CachedObject *finishedObj);

protected:
    // Internal buffers
    ///////////////////
    QChar *buffer;
    QChar *dest;

    Token currToken;

    // the size of buffer
    int size;

    // Tokenizer flags
    //////////////////
    // are we in quotes within a html tag
    enum
    {
        NoQuote = 0,
        SingleQuote,
        DoubleQuote
    } tquote;

    enum
    {
        NonePending = 0,
        SpacePending,
        LFPending,
        TabPending
    } pending;

    // Discard line breaks immediately after start-tags
    // Discard spaces after '=' within tags
    enum
    {
        NoneDiscard = 0,
        SpaceDiscard,
        LFDiscard,
        AllDiscard  // discard all spaces, LF's etc until next non white char
    } discard;

    // Discard the LF part of CRLF sequence
    bool skipLF;

    // Flag to say that we have the '<' but not the character following it.
    bool startTag;

    // Flag to say, we are just parsing a tag, meaning, we are in the middle
    // of <tag...
    enum {
        NoTag = 0,
        TagName,
        SearchAttribute,
        AttributeName,
        SearchEqual,
        SearchValue,
        QuotedValue,
        Value,
        SearchEnd
    } tag;

    // Are we in a &... character entity description?
    enum {
        NoEntity = 0,
        SearchEntity,
        NumericSearch,
        Hexadecimal,
        Decimal,
        EntityName,
        SearchSemicolon
    } Entity;
    unsigned EntityUnicodeValue;

    // are we in a <script> ... </script block
    bool script;

    // Are we in a <pre> ... </pre> block
    bool pre;

    // if 'pre == true' we track in which column we are
    int prePos;

    // Are we in a <style> ... </style> block
    bool style;

    // Are we in a <select> ... </select> block
    bool select;

    // Are we in a <xmp> ... </xmp> block
    bool xmp;

    // Are we in a <title> ... </title> block
    bool title;

    // Are we in plain textmode ?
    bool plaintext;

    // XML processing instructions. Ignored at the moment
    bool processingInstruction;

    // Area we in a <!-- comment --> block
    bool comment;

    // Are we in a <textarea> ... </textarea> block
    bool textarea;

    // was the previous character escaped ?
    bool escaped;

    // are we in a server includes statement?
    bool server;

    bool brokenServer;

    // name of an unknown attribute
    QString attrName;
    // whether or not the attrname is present (either we found a known HTML attr or we found an unknown
    // nonempty attrName).
    bool attrNamePresent;
    
    // Used to store the code of a srcipting sequence
    QChar *scriptCode;
    // Size of the script sequenze stored in @ref #scriptCode
    int scriptCodeSize;
    // Maximal size that can be stored in @ref #scriptCode
    int scriptCodeMaxSize;
    // resync point of script code size
    int scriptCodeResync;

    // Stores characters if we are scanning for a string like "</script>"
    QChar searchBuffer[ 10 ];
    // Counts where we are in the string we are scanning for
    int searchCount;
    // The string we are searching for
    const QChar *searchFor;
    // the stopper string
    const char* searchStopper;
    // the stopper len
    int searchStopperLen;
    // true if we are waiting for an external script (<SCRIPT SRC=...) to load, i.e.
    // we don't do any parsing while this is true
    bool loadingExtScript;
    // if no more data is coming, just parse what we have (including ext scripts that
    // may be still downloading) and finish
    bool noMoreData;
    // URL to get source code of script from
    QString scriptSrc;
    QString scriptSrcCharset;
    bool javascript;
    // the HTML code we will parse after the external script we are waiting for has loaded
    TokenizerString pendingSrc;

    // the HTML code we will parse after this particular script has
    // loaded, but before all pending HTML
    TokenizerString *currentPrependingSrc;

    // true if we are executing a script while parsing a document. This causes the parsing of
    // the output of the script to be postponed until after the script has finished executing
    int m_executingScript;
    QPtrQueue<CachedScript> cachedScript;
    // you can pause the tokenizer if you need to display a dialog or something
    bool onHold;

    // if we found one broken comment, there are most likely others as well
    // store a flag to get rid of the O(n^2) behaviour in such a case.
    bool brokenComments;
    // current line number
    int lineno;
    // line number at which the current <script> started
    int scriptStartLineno;
    int tagStartLineno;

    // The timer for continued processing.
    int timerId;
    bool allowYield;
    bool forceSynchronous;  // disables yielding

    bool includesCommentsInDOM;

// This buffer can hold arbitrarily long user-defined attribute names, such as in EMBED tags.
// So any fixed number might be too small, but rather than rewriting all usage of this buffer
// we'll just make it large enough to handle all imaginable cases.
#define CBUFLEN 1024
    char cBuffer[CBUFLEN+2];
    unsigned int cBufferPos;

    TokenizerString src;

    KCharsets *charsets;
    KHTMLParser *parser;

    QGuardedPtr<KHTMLView> view;
    
    bool inWrite;
};

}

#if APPLE_CHANGES
#undef id
#endif

#endif // HTMLTOKENIZER