src/stc/scintilla/include/Accessor.h

   1 // SciTE - Scintilla based Text Editor
   2 // Accessor.h - rapid easy access to contents of a Scintilla
   3 // Copyright 1998-2000 by Neil Hodgson <neilh@scintilla.org>
   4 // The License.txt file describes the conditions under which this software may be distributed.
   5
   6 class Accessor {
   7 protected:
   8         // bufferSize is a trade off between time taken to copy the characters and SendMessage overhead
   9         // slopSize positions the buffer before the desired position in case there is some backtracking
  10         enum {bufferSize=4000, slopSize=bufferSize/8};
  11         char buf[bufferSize+1];
  12         WindowID id;
  13         PropSet &props;
  14         int startPos;
  15         int endPos;
  16         int lenDoc;
  17         int offset;     // Optional but including an offset makes GCC generate better code
  18         void Fill(int position);
  19 public:
  20         Accessor(WindowID id_, PropSet &props_, int offset_=0) :
  21                         id(id_), props(props_), startPos(0x7FFFFFFF), endPos(0),
  22                         lenDoc(-1), offset(offset_) {
  23         }
  24         char operator[](int position) {
  25                 position += offset;
  26                 if (position < startPos || position >= endPos) {
  27                         Fill(position);
  28                 }
  29                 return buf[position - startPos];
  30         }
  31         char SafeGetCharAt(int position, char chDefault=' ') {
  32                 // Safe version of operator[], returning a defined value for invalid position
  33                 position += offset;
  34                 if (position < startPos || position >= endPos) {
  35                         Fill(position);
  36                         if (position < startPos || position >= endPos) {
  37                                 // Position is outside range of document
  38                                 return chDefault;
  39                         }
  40                 }
  41                 return buf[position - startPos];
  42         }
  43         char StyleAt(int position);
  44         int GetLine(int position);
  45         int LineStart(int line);
  46         int LevelAt(int line);
  47         int Length();
  48         void Flush() {
  49                 startPos = 0x7FFFFFFF;
  50                 lenDoc = -1;
  51         }
  52         int GetLineState(int line);
  53         int SetLineState(int line, int state);
  54         PropSet &GetPropSet() { return props; }
  55 };
  56
  57 class StylingContext : public Accessor {
  58         char styleBuf[bufferSize];
  59         int validLen;
  60         char chFlags;
  61         char chWhile;
  62         unsigned int startSeg;
  63 public:
  64         StylingContext(WindowID id_, PropSet &props_, int offset_=0) :
  65                 Accessor(id_,props_,offset_), validLen(0), chFlags(0) {}
  66         void StartAt(unsigned int start, char chMask=31);
  67         void SetFlags(char chFlags_, char chWhile_) {chFlags = chFlags_; chWhile = chWhile_; };
  68         void ColourSegment(unsigned int start, unsigned int end, int chAttr);
  69         unsigned int GetStartSegment() { return startSeg; }
  70         void StartSegment(unsigned int pos);
  71         void ColourTo(unsigned int pos, int chAttr);
  72         int GetLine(int position);
  73         void SetLevel(int line, int level);
  74         void Flush();
  75 };
  76