using subclass as impl ptr, common code in macro because mix-in are not possible...

[wxWidgets.git] / include / wx / html / htmlpars.h

diff --git a/include/wx/html/htmlpars.h b/include/wx/html/htmlpars.h
index 272c44ad5efe0878f89f8134ad194eb245e527f8..92dc1be5756bc6e8b79846a2a7b06f356c5bcfc0 100644 (file)
--- a/include/wx/html/htmlpars.h
+++ b/include/wx/html/htmlpars.h
@@ -4,41 +4,56 @@
 // Author:      Vaclav Slavik
 // RCS-ID:      $Id$
 // Copyright:   (c) 1999 Vaclav Slavik
 // 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_
 
 #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/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 WXDLLIMPEXP_FWD_BASE wxMBConv;
+class WXDLLIMPEXP_FWD_HTML wxHtmlParser;
+class WXDLLIMPEXP_FWD_HTML wxHtmlTagHandler;
+class WXDLLIMPEXP_FWD_HTML wxHtmlEntitiesParser;
+
+class wxHtmlTextPieces;
+class wxHtmlParserState;

 
 

-class wxHtmlParser;
-class wxHtmlTagHandler;
+WX_DECLARE_HASH_SET_WITH_DECL(wxHtmlTagHandler*,
+                              wxPointerHash, wxPointerEqual,
+                              wxHtmlTagHandlersSet,
+                              class WXDLLIMPEXP_HTML);
+WX_DECLARE_STRING_HASH_MAP_WITH_DECL(wxHtmlTagHandler*,
+                                     wxHtmlTagHandlersHash,
+                                     class WXDLLIMPEXP_HTML);

 
 

-//--------------------------------------------------------------------------------
-// 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 WXDLLEXPORT wxHtmlParser : public wxObject
+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:
 {
     DECLARE_ABSTRACT_CLASS(wxHtmlParser)
 
 public:

-    wxHtmlParser() : wxObject(), m_HandlersHash(wxKEY_STRING) 
-        { m_FS = NULL; m_Cache = NULL; m_HandlersStack = NULL; }
+    wxHtmlParser();

     virtual ~wxHtmlParser();
 
     // Sets the class which will be used for opening files
     virtual ~wxHtmlParser();
 
     // Sets the class which will be used for opening files


@@ -46,11 +61,15 @@ public:
 
     wxFileSystem* GetFS() const { return m_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();
     // 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)
+    // 3. call GetProduct(); (its return value is then returned)

     // 4. call DoneParser();
     wxObject* Parse(const wxString& source);
 
     // 4. call DoneParser();
     wxObject* Parse(const wxString& source);
 


@@ -59,10 +78,17 @@ public:
     // This must be called after Parse().
     virtual void DoneParser();
 
     // 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)
     // Parses the m_Source from begin_pos to end_pos-1.
     // (in noparams version it parses whole m_Source)

-    void DoParsing(int begin_pos, int end_pos);
-    inline void DoParsing() {DoParsing(0, m_Source.Length());};
+    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
 
     // Returns product of parsing
     // Returned value is result of parsing of the part. The type of this result


@@ -73,7 +99,7 @@ public:
     // adds handler to the list & hash table of handlers.
     virtual void AddTagHandler(wxHtmlTagHandler *handler);
 
     // 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). 
+    // 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:
     //   <myitems>
     // The handler should already be in use by this parser.
     // Example: you want to parse following pseudo-html structure:
     //   <myitems>


@@ -81,24 +107,59 @@ public:
     //     <it name="two" value="2">
     //   </myitems>
     //   <it> This last it has different meaning, we don't want it to be parsed by myitems handler!
     //     <it name="two" value="2">
     //   </myitems>
     //   <it> This last it has different meaning, we don't want it to be parsed by myitems handler!

-    // handler can handle only 'myitems' (e.g. it's GetSupportedTags returns "MYITEMS")
+    // handler can handle only 'myitems' (e.g. its GetSupportedTags returns "MYITEMS")

     // you can call PushTagHandler(handler, "IT") when you find <myitems>
     // and call PopTagHandler() when you find </myitems>
     // you can call PushTagHandler(handler, "IT") when you find <myitems>
     // and call PopTagHandler() when you find </myitems>

-    void PushTagHandler(wxHtmlTagHandler *handler, wxString tags);
+    void PushTagHandler(wxHtmlTagHandler *handler, const wxString& tags);

 
     // Restores state before last call to PushTagHandler
     void PopTagHandler();
 
 
     // Restores state before last call to PushTagHandler
     void PopTagHandler();
 

-    wxString* GetSource() {return &m_Source;}
+    const wxString* GetSource() {return m_Source;}

     void SetSource(const wxString& src);
 
     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, <pre> handler replaces spaces with &nbsp;
+    // and newlines with <br>)
+    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 <meta> 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:
 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 overriden in derived classes.
     // 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 AddText(const char* txt) = 0;
+    // 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 overriden.
 
     // Adds tag and proceeds it. Parse() may (and usually is) called from this method.
     // This is called from Parse() and may be overriden.


@@ -108,12 +169,15 @@ protected:
     virtual void AddTag(const wxHtmlTag& tag);
 
 protected:
     virtual void AddTag(const wxHtmlTag& tag);
 
 protected:

-    // source being parsed
-    wxString m_Source;
+    // DOM tree:
+    wxHtmlTag *m_CurTag;
+    wxHtmlTag *m_Tags;
+    wxHtmlTextPieces *m_TextPieces;
+    size_t m_CurTextPiece;

 
 

-    // tags cache, used during parsing.
-    wxHtmlTagsCache *m_Cache;
-    wxHashTable m_HandlersHash;
+    const wxString *m_Source;
+
+    wxHtmlParserState *m_SavedStates;

 
     // handlers that handle particular tags. The table is accessed by
     // key = tag's name.
 
     // handlers that handle particular tags. The table is accessed by
     // key = tag's name.


@@ -124,31 +188,33 @@ protected:
     //      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.
     //      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.

-    wxList m_HandlersList;
+    wxHtmlTagHandlersSet m_HandlersSet;
+    wxHtmlTagHandlersHash m_HandlersHash;
+
+    DECLARE_NO_COPY_CLASS(wxHtmlParser)

 
     // class for opening files (file system)
     wxFileSystem *m_FS;
     // handlers stack used by PushTagHandler and PopTagHandler
 
     // class for opening files (file system)
     wxFileSystem *m_FS;
     // handlers stack used by PushTagHandler and PopTagHandler

-    wxList *m_HandlersStack;
-};
-
-
+    wxVector<wxHtmlTagHandlersHash*> 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)
 
 {
     DECLARE_ABSTRACT_CLASS(wxHtmlTagHandler)
 


@@ -159,7 +225,7 @@ public:
     // NOTE : each _instance_ of handler is guaranteed to be called
     // only by one parser. This means you don't have to care about
     // reentrancy.
     // 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) 
+    virtual void SetParser(wxHtmlParser *parser)

         { m_Parser = parser; }
 
     // Returns list of supported tags. The list is in uppercase and
         { m_Parser = parser; }
 
     // Returns list of supported tags. The list is in uppercase and


@@ -170,20 +236,64 @@ public:
 
     // This is hadling core method. It does all the Steps 1-3.
     // To process step 2, you can call ParseInner()
 
     // 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
+    // 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.
     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.GetBeginPos(), tag.GetEndPos1()); }
+    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;
 
     wxHtmlParser *m_Parser;

+
+    DECLARE_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_WCHAR_T==0 or wxUSE_UNICODE==1
+    void SetEncoding(wxFontEncoding encoding);
+
+    // 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_WCHAR_T && !wxUSE_UNICODE
+    wxMBConv *m_conv;
+    wxFontEncoding m_encoding;
+#endif
+
+    DECLARE_NO_COPY_CLASS(wxHtmlEntitiesParser)
+};

 
 
 #endif
 
 
 #endif