177 lines
7.2 KiB
C
177 lines
7.2 KiB
C
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/////////////////////////////////////////////////////////////////////////////
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// Name: htmlparser.h
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// Purpose: wxHtmlParser class (generic parser)
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// Author: Vaclav Slavik
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// Copyright: (c) 1999 Vaclav Slavik
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// Licence: wxWindows Licence
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/////////////////////////////////////////////////////////////////////////////
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#ifndef __HTMLPARSER_H__
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#define __HTMLPARSER_H__
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#ifdef __GNUG__
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#pragma interface
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#endif
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#include "wx/defs.h"
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#if wxUSE_HTML
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#include <wx/html/htmltag.h>
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#include <wx/filesys.h>
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class wxHtmlParser;
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class wxHtmlTagHandler;
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//--------------------------------------------------------------------------------
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// wxHtmlParser
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// This class handles generic parsing of HTML document : it scans
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// the document and divide it into blocks of tags (where one block
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// consists of starting and ending tag and of text between these
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// 2 tags.
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//--------------------------------------------------------------------------------
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class WXDLLEXPORT wxHtmlParser : public wxObject
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{
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DECLARE_ABSTRACT_CLASS(wxHtmlParser)
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protected:
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wxString m_Source;
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// source being parsed
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wxHtmlTagsCache *m_Cache;
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// tags cache, used during parsing.
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wxHashTable m_HandlersHash;
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wxList m_HandlersList;
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// handlers that handle particular tags. The table is accessed by
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// key = tag's name.
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// This attribute MUST be filled by derived class otherwise it would
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// be empty and no tags would be recognized
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// (see wxHtmlWinParser for details about filling it)
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// m_HandlersHash is for random access based on knowledge of tag name (BR, P, etc.)
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// it may (and often does) contain more references to one object
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// m_HandlersList is list of all handlers and it is guaranteed to contain
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// only one reference to each handler instance.
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wxFileSystem *m_FS;
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// class for opening files (file system)
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public:
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wxHtmlParser() : wxObject(), m_HandlersHash(wxKEY_STRING) {m_FS = NULL; m_Cache = NULL;}
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virtual ~wxHtmlParser();
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void SetFS(wxFileSystem *fs) {m_FS = fs;}
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// Sets the class which will be used for opening files
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wxFileSystem* GetFS() const {return m_FS;}
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wxObject* Parse(const wxString& source);
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// You can simply call this method when you need parsed output.
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// This method does these things:
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// 1. call InitParser(source);
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// 2. call DoParsing();
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// 3. call GetProduct(); (it's return value is then returned)
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// 4. call DoneParser();
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virtual void InitParser(const wxString& source);
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// Sets the source. This must be called before running Parse() method.
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virtual void DoneParser();
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// This must be called after Parse().
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void DoParsing(int begin_pos, int end_pos);
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inline void DoParsing() {DoParsing(0, m_Source.Length());};
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// Parses the m_Source from begin_pos to end_pos-1.
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// (in noparams version it parses whole m_Source)
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virtual wxObject* GetProduct() = 0;
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// Returns product of parsing
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// Returned value is result of parsing of the part. The type of this result
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// depends on internal representation in derived parser
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// (see wxHtmlWinParser for details).
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virtual void AddTagHandler(wxHtmlTagHandler *handler);
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// adds handler to the list & hash table of handlers.
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wxString* GetSource() {return &m_Source;}
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virtual wxList* GetTempData() {return NULL;}
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// this method returns list of wxObjects that represents
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// all data allocated by the parser. These can't be freeded
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// by destructor because they must be valid as long as
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// GetProduct's return value is valid - the caller must
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// explicitly call delete MyParser -> GetTempData() to free
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// the memory
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// (this method always sets the list to delete its contents)
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protected:
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virtual void AddText(const char* txt) = 0;
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// Adds text to the output.
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// This is called from Parse() and must be overriden in derived classes.
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// txt is not guaranteed to be only one word. It is largest continuous part of text
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// (= not broken by tags)
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// NOTE : using char* because of speed improvements
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virtual void AddTag(const wxHtmlTag& tag);
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// Adds tag and proceeds it. Parse() may (and usually is) called from this method.
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// This is called from Parse() and may be overriden.
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// Default behavior is that it looks for proper handler in m_Handlers. The tag is
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// ignored if no hander is found.
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// Derived class is *responsible* for filling in m_Handlers table.
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};
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//--------------------------------------------------------------------------------
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// wxHtmlTagHandler
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// This class (and derived classes) cooperates with wxHtmlParser.
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// Each recognized tag is passed to handler which is capable
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// of handling it. Each tag is handled in 3 steps:
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// 1. Handler will modifies state of parser
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// (using it's public methods)
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// 2. Parser parses source between starting and ending tag
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// 3. Handler restores original state of the parser
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//--------------------------------------------------------------------------------
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class WXDLLEXPORT wxHtmlTagHandler : public wxObject
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{
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DECLARE_ABSTRACT_CLASS(wxHtmlTagHandler)
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protected:
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wxHtmlParser *m_Parser;
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public:
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wxHtmlTagHandler() : wxObject () {m_Parser = NULL;};
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virtual void SetParser(wxHtmlParser *parser) {m_Parser = parser;}
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// Sets the parser.
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// NOTE : each _instance_ of handler is guaranteed to be called
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// only by one parser. This means you don't have to care about
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// reentrancy.
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virtual wxString GetSupportedTags() = 0;
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// Returns list of supported tags. The list is in uppercase and
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// tags are delimited by ','.
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// Example : "I,B,FONT,P"
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// is capable of handling italic, bold, font and paragraph tags
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virtual bool HandleTag(const wxHtmlTag& tag) = 0;
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// This is hadling core method. It does all the Steps 1-3.
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// To process step 2, you can call ParseInner()
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// returned value : TRUE if it called ParseInner(),
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// FALSE etherwise
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protected:
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void ParseInner(const wxHtmlTag& tag) {m_Parser -> DoParsing(tag.GetBeginPos(), tag.GetEndPos1());}
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// parses input between beginning and ending tag.
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// m_Parser must be set.
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};
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#endif // __HTMLPARSER_H__
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#endif
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