contrib/src/stc/scintilla/include/Accessor.h

   1 // Scintilla source code edit control
   2 /** @file Accessor.h
   3  ** Rapid easy access to contents of a Scintilla.
   4  **/
   5 // Copyright 1998-2001 by Neil Hodgson <neilh@scintilla.org>
   6 // The License.txt file describes the conditions under which this software may be distributed.
   7
   8 enum { wsSpace = 1, wsTab = 2, wsSpaceTab = 4, wsInconsistent=8};
   9
  10 class Accessor;
  11
  12 typedef bool (*PFNIsCommentLeader)(Accessor &styler, int pos, int len);
  13
  14 /**
  15  * Interface to data in a Scintilla.
  16  */
  17 class Accessor {
  18 protected:
  19         enum {extremePosition=0x7FFFFFFF};
  20         /** @a bufferSize is a trade off between time taken to copy the characters
  21          * and retrieval overhead.
  22          * @a slopSize positions the buffer before the desired position
  23          * in case there is some backtracking. */
  24         enum {bufferSize=4000, slopSize=bufferSize/8};
  25         char buf[bufferSize+1];
  26         int startPos;
  27         int endPos;
  28         int codePage;
  29
  30         virtual bool InternalIsLeadByte(char ch)=0;
  31         virtual void Fill(int position)=0;
  32
  33 public:
  34         Accessor() : startPos(extremePosition), endPos(0), codePage(0) {}
  35         virtual ~Accessor() {}
  36         char operator[](int position) {
  37                 if (position < startPos || position >= endPos) {
  38                         Fill(position);
  39                 }
  40                 return buf[position - startPos];
  41         }
  42         /** Safe version of operator[], returning a defined value for invalid position. */
  43         char SafeGetCharAt(int position, char chDefault=' ') {
  44                 if (position < startPos || position >= endPos) {
  45                         Fill(position);
  46                         if (position < startPos || position >= endPos) {
  47                                 // Position is outside range of document
  48                                 return chDefault;
  49                         }
  50                 }
  51                 return buf[position - startPos];
  52         }
  53         bool IsLeadByte(char ch) {
  54                 return codePage && InternalIsLeadByte(ch);
  55         }
  56         void SetCodePage(int codePage_) { codePage = codePage_; }
  57
  58         virtual bool Match(int pos, const char *s)=0;
  59         virtual char StyleAt(int position)=0;
  60         virtual int GetLine(int position)=0;
  61         virtual int LineStart(int line)=0;
  62         virtual int LevelAt(int line)=0;
  63         virtual int Length()=0;
  64         virtual void Flush()=0;
  65         virtual int GetLineState(int line)=0;
  66         virtual int SetLineState(int line, int state)=0;
  67         virtual int GetPropertyInt(const char *key, int defaultValue=0)=0;
  68         virtual char *GetProperties()=0;
  69
  70         // Style setting
  71         virtual void StartAt(unsigned int start, char chMask=31)=0;
  72         virtual void SetFlags(char chFlags_, char chWhile_)=0;
  73         virtual unsigned int GetStartSegment()=0;
  74         virtual void StartSegment(unsigned int pos)=0;
  75         virtual void ColourTo(unsigned int pos, int chAttr)=0;
  76         virtual void SetLevel(int line, int level)=0;
  77         virtual int IndentAmount(int line, int *flags, PFNIsCommentLeader pfnIsCommentLeader = 0)=0;
  78 };