include/wx/html/htmltag.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        htmltag.h
   3 // Purpose:     wxHtmlTag class (represents single tag)
   4 // Author:      Vaclav Slavik
   5 // RCS-ID:      $Id$
   6 // Copyright:   (c) 1999 Vaclav Slavik
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10
  11 #ifndef _WX_HTMLTAG_H_
  12 #define _WX_HTMLTAG_H_
  13
  14 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  15 #pragma interface "htmltag.h"
  16 #endif
  17
  18 #include "wx/defs.h"
  19
  20 #if wxUSE_HTML
  21
  22 #include "wx/object.h"
  23 #include "wx/arrstr.h"
  24
  25 class WXDLLIMPEXP_CORE wxColour;
  26 class WXDLLIMPEXP_HTML wxHtmlEntitiesParser;
  27
  28 //-----------------------------------------------------------------------------
  29 // wxHtmlTagsCache
  30 //          - internal wxHTML class, do not use!
  31 //-----------------------------------------------------------------------------
  32
  33 struct wxHtmlCacheItem;
  34
  35 class WXDLLIMPEXP_HTML wxHtmlTagsCache : public wxObject
  36 {
  37     DECLARE_DYNAMIC_CLASS(wxHtmlTagsCache)
  38
  39 private:
  40     wxHtmlCacheItem *m_Cache;
  41     int m_CacheSize;
  42     int m_CachePos;
  43
  44 public:
  45     wxHtmlTagsCache() : wxObject() {m_CacheSize = 0; m_Cache = NULL;}
  46     wxHtmlTagsCache(const wxString& source);
  47     ~wxHtmlTagsCache() {free(m_Cache);}
  48
  49     // Finds parameters for tag starting at at and fills the variables
  50     void QueryTag(int at, int* end1, int* end2);
  51
  52     DECLARE_NO_COPY_CLASS(wxHtmlTagsCache)
  53 };
  54
  55
  56 //--------------------------------------------------------------------------------
  57 // wxHtmlTag
  58 //                  This represents single tag. It is used as internal structure
  59 //                  by wxHtmlParser.
  60 //--------------------------------------------------------------------------------
  61
  62 class WXDLLIMPEXP_HTML wxHtmlTag : public wxObject
  63 {
  64     DECLARE_CLASS(wxHtmlTag)
  65
  66 protected:
  67     // constructs wxHtmlTag object based on HTML tag.
  68     // The tag begins (with '<' character) at position pos in source
  69     // end_pos is position where parsing ends (usually end of document)
  70     wxHtmlTag(wxHtmlTag *parent,
  71               const wxString& source, int pos, int end_pos,
  72               wxHtmlTagsCache *cache,
  73               wxHtmlEntitiesParser *entParser);
  74     friend class wxHtmlParser;
  75 public:
  76     ~wxHtmlTag();
  77
  78     wxHtmlTag *GetParent() const {return m_Parent;}
  79     wxHtmlTag *GetFirstSibling() const;
  80     wxHtmlTag *GetLastSibling() const;
  81     wxHtmlTag *GetChildren() const { return m_FirstChild; }
  82     wxHtmlTag *GetPreviousSibling() const { return m_Prev; }
  83     wxHtmlTag *GetNextSibling() const {return m_Next; }
  84     // Return next tag, as if tree had been flattened
  85     wxHtmlTag *GetNextTag() const;
  86
  87     // Returns tag's name in uppercase.
  88     inline wxString GetName() const {return m_Name;}
  89
  90     // Returns true if the tag has given parameter. Parameter
  91     // should always be in uppercase.
  92     // Example : <IMG SRC="test.jpg"> HasParam("SRC") returns true
  93     bool HasParam(const wxString& par) const;
  94
  95     // Returns value of the param. Value is in uppercase unless it is
  96     // enclosed with "
  97     // Example : <P align=right> GetParam("ALIGN") returns (RIGHT)
  98     //           <P IMG SRC="WhaT.jpg"> GetParam("SRC") returns (WhaT.jpg)
  99     //                           (or ("WhaT.jpg") if with_commas == true)
 100     wxString GetParam(const wxString& par, bool with_commas = false) const;
 101
 102     // Convenience functions:
 103     bool GetParamAsColour(const wxString& par, wxColour *clr) const;
 104     bool GetParamAsInt(const wxString& par, int *clr) const;
 105
 106     // Scans param like scanf() functions family does.
 107     // Example : ScanParam("COLOR", "\"#%X\"", &clr);
 108     // This is always with with_commas=false
 109     // Returns number of scanned values
 110     // (like sscanf() does)
 111     // NOTE: unlike scanf family, this function only accepts
 112     //       *one* parameter !
 113     int ScanParam(const wxString& par, const wxChar *format, void *param) const;
 114
 115     // Returns string containing all params.
 116     wxString GetAllParams() const;
 117
 118 #if WXWIN_COMPATIBILITY_2_2
 119     // return true if this is ending tag (</something>) or false
 120     // if it isn't (<something>)
 121     inline bool IsEnding() const {return false;}
 122 #endif
 123
 124     // return true if this there is matching ending tag
 125     inline bool HasEnding() const {return m_End1 >= 0;}
 126
 127     // returns beginning position of _internal_ block of text
 128     // See explanation (returned value is marked with *):
 129     // bla bla bla <MYTAG>* bla bla intenal text</MYTAG> bla bla
 130     inline int GetBeginPos() const {return m_Begin;}
 131     // returns ending position of _internal_ block of text.
 132     // bla bla bla <MYTAG> bla bla intenal text*</MYTAG> bla bla
 133     inline int GetEndPos1() const {return m_End1;}
 134     // returns end position 2 :
 135     // bla bla bla <MYTAG> bla bla internal text</MYTAG>* bla bla
 136     inline int GetEndPos2() const {return m_End2;}
 137
 138 private:
 139     wxString m_Name;
 140     int m_Begin, m_End1, m_End2;
 141     wxArrayString m_ParamNames, m_ParamValues;
 142
 143     // DOM tree relations:
 144     wxHtmlTag *m_Next;
 145     wxHtmlTag *m_Prev;
 146     wxHtmlTag *m_FirstChild, *m_LastChild;
 147     wxHtmlTag *m_Parent;
 148
 149     DECLARE_NO_COPY_CLASS(wxHtmlTag)
 150 };
 151
 152
 153
 154
 155
 156 #endif
 157
 158 #endif // _WX_HTMLTAG_H_
 159