// 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
+#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
+#pragma interface "htmlpars.h"
#endif
#include "wx/defs.h"
#include "wx/html/htmltag.h"
#include "wx/filesys.h"
+#include "wx/hash.h"
+#include "wx/fontenc.h"
-class wxHtmlParser;
-class wxHtmlTagHandler;
+class WXDLLIMPEXP_BASE wxMBConv;
+class WXDLLIMPEXP_HTML wxHtmlParser;
+class WXDLLIMPEXP_HTML wxHtmlTagHandler;
+class WXDLLIMPEXP_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
+
+enum wxHtmlURLType
{
- DECLARE_ABSTRACT_CLASS(wxHtmlParser)
+ wxHTML_URL_PAGE,
+ wxHTML_URL_IMAGE,
+ wxHTML_URL_OTHER
+};
- 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)
+// 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 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(); (it's 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(int begin_pos, int 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:
+ // <myitems>
+ // <it name="one" value="1">
+ // <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")
+ // you can call PushTagHandler(handler, "IT") when you find <myitems>
+ // and call PopTagHandler() when you find </myitems>
+ void PushTagHandler(wxHtmlTagHandler *handler, wxString tags);
+
+ // Restores state before last call to PushTagHandler
+ void PopTagHandler();
+
+ wxString* GetSource() {return &m_Source;}
+ void SetSource(const wxString& src);
+
+ // Sets HTML source and remebers 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
+ // 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();
+
+ // 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; }
+
+protected:
+ // DOM structure
+ void CreateDOMTree();
+ void DestroyDOMTree();
+ void CreateDOMSubTree(wxHtmlTag *cur,
+ int begin_pos, int end_pos,
+ wxHtmlTagsCache *cache);
+
+ // 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 wxChar* 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.
+ // 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.
+ virtual void AddTag(const wxHtmlTag& tag);
+
+protected:
+ // DOM tree:
+ wxHtmlTag *m_CurTag;
+ wxHtmlTag *m_Tags;
+ wxHtmlTextPieces *m_TextPieces;
+ size_t m_CurTextPiece;
+
+ 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.
+ wxList m_HandlersList;
+ wxHashTable m_HandlersHash;
+
+ DECLARE_NO_COPY_CLASS(wxHtmlParser)
+
+ // class for opening files (file system)
+ wxFileSystem *m_FS;
+ // handlers stack used by PushTagHandler and PopTagHandler
+ wxList *m_HandlersStack;
+
+ // entity parse
+ wxHtmlEntitiesParser *m_entitiesParser;
+
+ // flag indicating that the parser should stop
+ bool m_stopParsing;
};
+// 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 WXDLLIMPEXP_HTML wxHtmlTagHandler : public wxObject
+{
+ DECLARE_ABSTRACT_CLASS(wxHtmlTagHandler)
+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; }
+
+ // 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.GetBeginPos(), tag.GetEndPos1()); }
+
+ wxHtmlParser *m_Parser;
+
+ DECLARE_NO_COPY_CLASS(wxHtmlTagHandler)
+};
-//--------------------------------------------------------------------------------
-// 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 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_ABSTRACT_CLASS(wxHtmlTagHandler)
+ DECLARE_DYNAMIC_CLASS(wxHtmlEntitiesParser)
- 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:
+ 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);
+ // Returns character for given entity or 0 if the enity is unknown
+ wxChar GetEntityChar(const wxString& entity);
+
+ // Returns character that represents given Unicode code
+#if wxUSE_UNICODE
+ wxChar GetCharForCode(unsigned code) { return (wxChar)code; }
+#else
+ wxChar GetCharForCode(unsigned code);
+#endif
+
+protected:
+#if wxUSE_WCHAR_T && !wxUSE_UNICODE
+ wxMBConv *m_conv;
+ wxFontEncoding m_encoding;
+#endif
+
+ DECLARE_NO_COPY_CLASS(wxHtmlEntitiesParser)
+};
#endif
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