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// SciTE - Scintilla based Text Editor
// Accessor.h - rapid easy access to contents of a Scintilla
// Copyright 1998-2000 by Neil Hodgson <neilh@scintilla.org>
// The License.txt file describes the conditions under which this software may be distributed.
enum { wsSpace = 1, wsTab = 2, wsSpaceTab = 4, wsInconsistent=8};
class Accessor {
protected:
// bufferSize is a trade off between time taken to copy the characters and SendMessage overhead
// slopSize positions the buffer before the desired position in case there is some backtracking
enum {bufferSize=4000, slopSize=bufferSize/8};
char buf[bufferSize+1];
WindowID id;
PropSet &props;
int startPos;
int endPos;
int lenDoc;
int offset; // Optional but including an offset makes GCC generate better code
int codePage;
bool InternalIsLeadByte(char ch);
void Fill(int position);
public:
Accessor(WindowID id_, PropSet &props_, int offset_=0) :
id(id_), props(props_), startPos(0x7FFFFFFF), endPos(0),
lenDoc(-1), offset(offset_), codePage(0) {
}
void SetCodePage(int codePage_) { codePage = codePage_; }
char operator[](int position) {
position += offset;
if (position < startPos || position >= endPos) {
Fill(position);
}
return buf[position - startPos];
}
char SafeGetCharAt(int position, char chDefault=' ') {
// Safe version of operator[], returning a defined value for invalid position
position += offset;
if (position < startPos || position >= endPos) {
Fill(position);
if (position < startPos || position >= endPos) {
// Position is outside range of document
return chDefault;
}
}
return buf[position - startPos];
}
bool IsLeadByte(char ch) {
return codePage && InternalIsLeadByte(ch);
}
char StyleAt(int position);
int GetLine(int position);
int LineStart(int line);
int LevelAt(int line);
int Length();
void Flush() {
startPos = 0x7FFFFFFF;
lenDoc = -1;
}
int GetLineState(int line);
int SetLineState(int line, int state);
PropSet &GetPropSet() { return props; }
};
class StylingContext;
typedef bool (*PFNIsCommentLeader)(StylingContext &styler, int pos, int len);
class StylingContext : public Accessor {
char styleBuf[bufferSize];
int validLen;
char chFlags;
char chWhile;
unsigned int startSeg;
public:
StylingContext(WindowID id_, PropSet &props_, int offset_=0) :
Accessor(id_,props_,offset_), validLen(0), chFlags(0) {}
void StartAt(unsigned int start, char chMask=31);
void SetFlags(char chFlags_, char chWhile_) {chFlags = chFlags_; chWhile = chWhile_; };
unsigned int GetStartSegment() { return startSeg; }
void StartSegment(unsigned int pos);
void ColourTo(unsigned int pos, int chAttr);
int GetLine(int position);
void SetLevel(int line, int level);
void Flush();
int IndentAmount(int line, int *flags, PFNIsCommentLeader pfnIsCommentLeader = 0);
};
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