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