X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/69941f05864fa8b37856ccc1338124bfac756a2b..a4301b8f14d21b7d28fc4f6a247b740d945ca6dc:/include/wx/html/htmlpars.h?ds=sidebyside diff --git a/include/wx/html/htmlpars.h b/include/wx/html/htmlpars.h index bc098ba42b..defce67bb4 100644 --- a/include/wx/html/htmlpars.h +++ b/include/wx/html/htmlpars.h @@ -1,176 +1,306 @@ ///////////////////////////////////////////////////////////////////////////// -// Name: htmlpars.h +// Name: wx/html/htmlpars.h // Purpose: wxHtmlParser class (generic parser) // Author: Vaclav Slavik // RCS-ID: $Id$ // Copyright: (c) 1999 Vaclav Slavik -// Licence: wxWindows Licence +// Licence: wxWindows licence ///////////////////////////////////////////////////////////////////////////// - #ifndef _WX_HTMLPARS_H_ #define _WX_HTMLPARS_H_ -#ifdef __GNUG__ -#pragma interface -#endif - #include "wx/defs.h" #if wxUSE_HTML #include "wx/html/htmltag.h" #include "wx/filesys.h" +#include "wx/hashmap.h" +#include "wx/hashset.h" +#include "wx/vector.h" +#include "wx/fontenc.h" -class wxHtmlParser; -class wxHtmlTagHandler; +class WXDLLIMPEXP_FWD_BASE wxMBConv; +class WXDLLIMPEXP_FWD_HTML wxHtmlParser; +class WXDLLIMPEXP_FWD_HTML wxHtmlTagHandler; +class WXDLLIMPEXP_FWD_HTML wxHtmlEntitiesParser; -//-------------------------------------------------------------------------------- -// wxHtmlParser -// This class handles generic parsing of HTML document : it scans -// the document and divide it into blocks of tags (where one block -// consists of starting and ending tag and of text between these -// 2 tags. -//-------------------------------------------------------------------------------- +class wxHtmlTextPieces; +class wxHtmlParserState; -class WXDLLEXPORT wxHtmlParser : public wxObject -{ - DECLARE_ABSTRACT_CLASS(wxHtmlParser) +WX_DECLARE_HASH_SET_WITH_DECL_PTR(wxHtmlTagHandler*, + wxPointerHash, wxPointerEqual, + wxHtmlTagHandlersSet, + class WXDLLIMPEXP_HTML); +WX_DECLARE_STRING_HASH_MAP_WITH_DECL(wxHtmlTagHandler*, + wxHtmlTagHandlersHash, + class WXDLLIMPEXP_HTML); - public: - wxHtmlParser() : wxObject(), m_HandlersHash(wxKEY_STRING) {m_FS = NULL; m_Cache = NULL;} - virtual ~wxHtmlParser(); - - void SetFS(wxFileSystem *fs) {m_FS = fs;} - // Sets the class which will be used for opening files - wxFileSystem* GetFS() const {return m_FS;} - - wxObject* Parse(const wxString& source); - // You can simply call this method when you need parsed output. - // This method does these things: - // 1. call InitParser(source); - // 2. call DoParsing(); - // 3. call GetProduct(); (it's return value is then returned) - // 4. call DoneParser(); - - virtual void InitParser(const wxString& source); - // Sets the source. This must be called before running Parse() method. - virtual void DoneParser(); - // This must be called after Parse(). - - void DoParsing(int begin_pos, int end_pos); - inline void DoParsing() {DoParsing(0, m_Source.Length());}; - // Parses the m_Source from begin_pos to end_pos-1. - // (in noparams version it parses whole m_Source) - - virtual wxObject* GetProduct() = 0; - // Returns product of parsing - // Returned value is result of parsing of the part. The type of this result - // depends on internal representation in derived parser - // (see wxHtmlWinParser for details). - - virtual void AddTagHandler(wxHtmlTagHandler *handler); - // adds handler to the list & hash table of handlers. - - wxString* GetSource() {return &m_Source;} - - virtual wxList* GetTempData() {return NULL;} - // this method returns list of wxObjects that represents - // all data allocated by the parser. These can't be freeded - // by destructor because they must be valid as long as - // GetProduct's return value is valid - the caller must - // explicitly call delete MyParser -> GetTempData() to free - // the memory - // (this method always sets the list to delete its contents) - - protected: - - virtual void AddText(const char* txt) = 0; - // Adds text to the output. - // This is called from Parse() and must be overriden in derived classes. - // txt is not guaranteed to be only one word. It is largest continuous part of text - // (= not broken by tags) - // NOTE : using char* because of speed improvements - - virtual void AddTag(const wxHtmlTag& tag); - // Adds tag and proceeds it. Parse() may (and usually is) called from this method. - // This is called from Parse() and may be overriden. - // Default behavior is that it looks for proper handler in m_Handlers. The tag is - // ignored if no hander is found. - // Derived class is *responsible* for filling in m_Handlers table. - - - protected: - wxString m_Source; - // source being parsed - wxHtmlTagsCache *m_Cache; - // tags cache, used during parsing. - wxHashTable m_HandlersHash; - wxList m_HandlersList; - // handlers that handle particular tags. The table is accessed by - // key = tag's name. - // This attribute MUST be filled by derived class otherwise it would - // be empty and no tags would be recognized - // (see wxHtmlWinParser for details about filling it) - // m_HandlersHash is for random access based on knowledge of tag name (BR, P, etc.) - // it may (and often does) contain more references to one object - // m_HandlersList is list of all handlers and it is guaranteed to contain - // only one reference to each handler instance. - wxFileSystem *m_FS; - // class for opening files (file system) +enum wxHtmlURLType +{ + wxHTML_URL_PAGE, + wxHTML_URL_IMAGE, + wxHTML_URL_OTHER }; +// This class handles generic parsing of HTML document : it scans +// the document and divides it into blocks of tags (where one block +// consists of starting and ending tag and of text between these +// 2 tags. +class WXDLLIMPEXP_HTML wxHtmlParser : public wxObject +{ + DECLARE_ABSTRACT_CLASS(wxHtmlParser) +public: + wxHtmlParser(); + virtual ~wxHtmlParser(); + + // Sets the class which will be used for opening files + void SetFS(wxFileSystem *fs) { m_FS = fs; } + + wxFileSystem* GetFS() const { return m_FS; } + + // Opens file if the parser is allowed to open given URL (may be forbidden + // for security reasons) + virtual wxFSFile *OpenURL(wxHtmlURLType type, const wxString& url) const; + + // You can simply call this method when you need parsed output. + // This method does these things: + // 1. call InitParser(source); + // 2. call DoParsing(); + // 3. call GetProduct(); (its return value is then returned) + // 4. call DoneParser(); + wxObject* Parse(const wxString& source); + + // Sets the source. This must be called before running Parse() method. + virtual void InitParser(const wxString& source); + // This must be called after Parse(). + virtual void DoneParser(); + + // May be called during parsing to immediately return from Parse(). + virtual void StopParsing() { m_stopParsing = true; } + + // Parses the m_Source from begin_pos to end_pos-1. + // (in noparams version it parses whole m_Source) + void DoParsing(const wxString::const_iterator& begin_pos, + const wxString::const_iterator& end_pos); + void DoParsing(); + + // Returns pointer to the tag at parser's current position + wxHtmlTag *GetCurrentTag() const { return m_CurTag; } + + // Returns product of parsing + // Returned value is result of parsing of the part. The type of this result + // depends on internal representation in derived parser + // (see wxHtmlWinParser for details). + virtual wxObject* GetProduct() = 0; + + // adds handler to the list & hash table of handlers. + virtual void AddTagHandler(wxHtmlTagHandler *handler); + + // Forces the handler to handle additional tags (not returned by GetSupportedTags). + // The handler should already be in use by this parser. + // Example: you want to parse following pseudo-html structure: + // + // + // + // + // This last it has different meaning, we don't want it to be parsed by myitems handler! + // handler can handle only 'myitems' (e.g. its GetSupportedTags returns "MYITEMS") + // you can call PushTagHandler(handler, "IT") when you find + // and call PopTagHandler() when you find + void PushTagHandler(wxHtmlTagHandler *handler, const wxString& tags); + + // Restores state before last call to PushTagHandler + void PopTagHandler(); + + const wxString* GetSource() {return m_Source;} + void SetSource(const wxString& src); + + // Sets HTML source and remembers current parser's state so that it can + // later be restored. This is useful for on-line modifications of + // HTML source (for example,
 handler replaces spaces with  
+    // and newlines with 
) + virtual void SetSourceAndSaveState(const wxString& src); + // Restores parser's state from stack or returns false if the stack is + // empty + virtual bool RestoreState(); + + // Returns HTML source inside the element (i.e. between the starting + // and ending tag) + wxString GetInnerSource(const wxHtmlTag& tag); + + // Parses HTML string 'markup' and extracts charset info from tag + // if present. Returns empty string if the tag is missing. + // For wxHTML's internal use. + static wxString ExtractCharsetInformation(const wxString& markup); + + // Returns entity parser object, used to substitute HTML &entities; + wxHtmlEntitiesParser *GetEntitiesParser() const { return m_entitiesParser; } + + // Returns true if the tag starting at the given position is a comment tag + // + // p should point to '<' character and is modified to point to the closing + // '>' of the end comment tag if this is indeed a comment + static bool + SkipCommentTag(wxString::const_iterator& p, wxString::const_iterator end); + +protected: + // DOM structure + void CreateDOMTree(); + void DestroyDOMTree(); + void CreateDOMSubTree(wxHtmlTag *cur, + const wxString::const_iterator& begin_pos, + const wxString::const_iterator& end_pos, + wxHtmlTagsCache *cache); + + // Adds text to the output. + // This is called from Parse() and must be overridden in derived classes. + // txt is not guaranteed to be only one word. It is largest continuous part + // of text (= not broken by tags) + virtual void AddText(const wxString& txt) = 0; + + // Adds tag and proceeds it. Parse() may (and usually is) called from this method. + // This is called from Parse() and may be overridden. + // Default behaviour is that it looks for proper handler in m_Handlers. The tag is + // ignored if no hander is found. + // Derived class is *responsible* for filling in m_Handlers table. + virtual void AddTag(const wxHtmlTag& tag); + +protected: + // DOM tree: + wxHtmlTag *m_CurTag; + wxHtmlTag *m_Tags; + wxHtmlTextPieces *m_TextPieces; + size_t m_CurTextPiece; + + const wxString *m_Source; + + wxHtmlParserState *m_SavedStates; + + // handlers that handle particular tags. The table is accessed by + // key = tag's name. + // This attribute MUST be filled by derived class otherwise it would + // be empty and no tags would be recognized + // (see wxHtmlWinParser for details about filling it) + // m_HandlersHash is for random access based on knowledge of tag name (BR, P, etc.) + // it may (and often does) contain more references to one object + // m_HandlersList is list of all handlers and it is guaranteed to contain + // only one reference to each handler instance. + wxHtmlTagHandlersSet m_HandlersSet; + wxHtmlTagHandlersHash m_HandlersHash; + + wxDECLARE_NO_COPY_CLASS(wxHtmlParser); + + // class for opening files (file system) + wxFileSystem *m_FS; + // handlers stack used by PushTagHandler and PopTagHandler + wxVector m_HandlersStack; + + // entity parse + wxHtmlEntitiesParser *m_entitiesParser; + + // flag indicating that the parser should stop + bool m_stopParsing; +}; - -//-------------------------------------------------------------------------------- -// wxHtmlTagHandler -// This class (and derived classes) cooperates with wxHtmlParser. -// Each recognized tag is passed to handler which is capable -// of handling it. Each tag is handled in 3 steps: -// 1. Handler will modifies state of parser -// (using it's public methods) -// 2. Parser parses source between starting and ending tag -// 3. Handler restores original state of the parser -//-------------------------------------------------------------------------------- - -class WXDLLEXPORT wxHtmlTagHandler : public wxObject +// This class (and derived classes) cooperates with wxHtmlParser. +// Each recognized tag is passed to handler which is capable +// of handling it. Each tag is handled in 3 steps: +// 1. Handler will modifies state of parser +// (using its public methods) +// 2. Parser parses source between starting and ending tag +// 3. Handler restores original state of the parser +class WXDLLIMPEXP_HTML wxHtmlTagHandler : public wxObject { DECLARE_ABSTRACT_CLASS(wxHtmlTagHandler) - protected: - wxHtmlParser *m_Parser; - - public: - wxHtmlTagHandler() : wxObject () {m_Parser = NULL;}; - - virtual void SetParser(wxHtmlParser *parser) {m_Parser = parser;} - // Sets the parser. - // NOTE : each _instance_ of handler is guaranteed to be called - // only by one parser. This means you don't have to care about - // reentrancy. - - virtual wxString GetSupportedTags() = 0; - // Returns list of supported tags. The list is in uppercase and - // tags are delimited by ','. - // Example : "I,B,FONT,P" - // is capable of handling italic, bold, font and paragraph tags - - virtual bool HandleTag(const wxHtmlTag& tag) = 0; - // This is hadling core method. It does all the Steps 1-3. - // To process step 2, you can call ParseInner() - // returned value : TRUE if it called ParseInner(), - // FALSE etherwise - - protected: - void ParseInner(const wxHtmlTag& tag) {m_Parser -> DoParsing(tag.GetBeginPos(), tag.GetEndPos1());} - // parses input between beginning and ending tag. - // m_Parser must be set. +public: + wxHtmlTagHandler() : wxObject () { m_Parser = NULL; } + + // Sets the parser. + // NOTE : each _instance_ of handler is guaranteed to be called + // only by one parser. This means you don't have to care about + // reentrancy. + virtual void SetParser(wxHtmlParser *parser) + { m_Parser = parser; } + + // Get the parser associated with this tag handler. + wxHtmlParser* GetParser() const { return m_Parser; } + + // Returns list of supported tags. The list is in uppercase and + // tags are delimited by ','. + // Example : "I,B,FONT,P" + // is capable of handling italic, bold, font and paragraph tags + virtual wxString GetSupportedTags() = 0; + + // This is hadling core method. It does all the Steps 1-3. + // To process step 2, you can call ParseInner() + // returned value : true if it called ParseInner(), + // false etherwise + virtual bool HandleTag(const wxHtmlTag& tag) = 0; + +protected: + // parses input between beginning and ending tag. + // m_Parser must be set. + void ParseInner(const wxHtmlTag& tag) + { m_Parser->DoParsing(tag.GetBeginIter(), tag.GetEndIter1()); } + + // Parses given source as if it was tag's inner code (see + // wxHtmlParser::GetInnerSource). Unlike ParseInner(), this method lets + // you specify the source code to parse. This is useful when you need to + // modify the inner text before parsing. + void ParseInnerSource(const wxString& source); + + wxHtmlParser *m_Parser; + + wxDECLARE_NO_COPY_CLASS(wxHtmlTagHandler); }; +// This class is used to parse HTML entities in strings. It can handle +// both named entities and &#xxxx entries where xxxx is Unicode code. +class WXDLLIMPEXP_HTML wxHtmlEntitiesParser : public wxObject +{ + DECLARE_DYNAMIC_CLASS(wxHtmlEntitiesParser) + +public: + wxHtmlEntitiesParser(); + virtual ~wxHtmlEntitiesParser(); + + // Sets encoding of output string. + // Has no effect if wxUSE_UNICODE==1 +#if wxUSE_UNICODE + void SetEncoding(wxFontEncoding WXUNUSED(encoding)) {} +#else + void SetEncoding(wxFontEncoding encoding); +#endif + + // Parses entities in input and replaces them with respective characters + // (with respect to output encoding) + wxString Parse(const wxString& input) const; + + // Returns character for given entity or 0 if the enity is unknown + wxChar GetEntityChar(const wxString& entity) const; + + // Returns character that represents given Unicode code +#if wxUSE_UNICODE + wxChar GetCharForCode(unsigned code) const { return (wxChar)code; } +#else + wxChar GetCharForCode(unsigned code) const; +#endif + +protected: +#if !wxUSE_UNICODE + wxMBConv *m_conv; + wxFontEncoding m_encoding; +#endif + + wxDECLARE_NO_COPY_CLASS(wxHtmlEntitiesParser); +}; #endif