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// Scintilla source code edit control
/** @file LexAccessor.h
** Interfaces between Scintilla and lexers.
**/
// Copyright 1998-2010 by Neil Hodgson <neilh@scintilla.org>
// The License.txt file describes the conditions under which this software may be distributed.
#ifndef LEXACCESSOR_H
#define LEXACCESSOR_H
#ifdef SCI_NAMESPACE
namespace Scintilla {
#endif
enum EncodingType { enc8bit, encUnicode, encDBCS };
class LexAccessor {
private:
IDocument *pAccess;
enum {extremePosition=0x7FFFFFFF};
/** @a bufferSize is a trade off between time taken to copy the characters
* and retrieval overhead.
* @a slopSize positions the buffer before the desired position
* in case there is some backtracking. */
enum {bufferSize=4000, slopSize=bufferSize/8};
char buf[bufferSize+1];
int startPos;
int endPos;
int codePage;
enum EncodingType encodingType;
int lenDoc;
int mask;
char styleBuf[bufferSize];
int validLen;
char chFlags;
char chWhile;
unsigned int startSeg;
int startPosStyling;
int documentVersion;
void Fill(int position) {
startPos = position - slopSize;
if (startPos + bufferSize > lenDoc)
startPos = lenDoc - bufferSize;
if (startPos < 0)
startPos = 0;
endPos = startPos + bufferSize;
if (endPos > lenDoc)
endPos = lenDoc;
pAccess->GetCharRange(buf, startPos, endPos-startPos);
buf[endPos-startPos] = '\0';
}
public:
LexAccessor(IDocument *pAccess_) :
pAccess(pAccess_), startPos(extremePosition), endPos(0),
codePage(pAccess->CodePage()),
encodingType(enc8bit),
lenDoc(pAccess->Length()),
mask(127), validLen(0), chFlags(0), chWhile(0),
startSeg(0), startPosStyling(0),
documentVersion(pAccess->Version()) {
switch (codePage) {
case 65001:
encodingType = encUnicode;
break;
case 932:
case 936:
case 949:
case 950:
case 1361:
encodingType = encDBCS;
}
}
char operator[](int position) {
if (position < startPos || position >= endPos) {
Fill(position);
}
return buf[position - startPos];
}
/** Safe version of operator[], returning a defined value for invalid position. */
char SafeGetCharAt(int position, char chDefault=' ') {
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) const {
return pAccess->IsDBCSLeadByte(ch);
}
EncodingType Encoding() const {
return encodingType;
}
bool Match(int pos, const char *s) {
for (int i=0; *s; i++) {
if (*s != SafeGetCharAt(pos+i))
return false;
s++;
}
return true;
}
char StyleAt(int position) const {
return static_cast<char>(pAccess->StyleAt(position) & mask);
}
int GetLine(int position) const {
return pAccess->LineFromPosition(position);
}
int LineStart(int line) const {
return pAccess->LineStart(line);
}
int LineEnd(int line) {
if (documentVersion >= dvLineEnd) {
return (static_cast<IDocumentWithLineEnd *>(pAccess))->LineEnd(line);
} else {
// Old interface means only '\r', '\n' and '\r\n' line ends.
int startNext = pAccess->LineStart(line+1);
char chLineEnd = SafeGetCharAt(startNext-1);
if (chLineEnd == '\n' && (SafeGetCharAt(startNext-2) == '\r'))
return startNext - 2;
else
return startNext - 1;
}
}
int GetRelativePosition(int start, int characterOffset, int *character, int *width) {
if (documentVersion >= dvLineEnd) {
return (static_cast<IDocumentWithLineEnd *>(pAccess))->GetRelativePosition(
start, characterOffset, character, width);
} else {
// Old version -> byte-oriented only
// Handle doc range overflow
int posNew = start + characterOffset;
if ((posNew < 0) || (posNew > Length()))
return -1;
*character = SafeGetCharAt(posNew, 0);
*width = 1;
return start + characterOffset;
}
}
int LevelAt(int line) const {
return pAccess->GetLevel(line);
}
int Length() const {
return lenDoc;
}
void Flush() {
startPos = extremePosition;
if (validLen > 0) {
pAccess->SetStyles(validLen, styleBuf);
startPosStyling += validLen;
validLen = 0;
}
}
int GetLineState(int line) const {
return pAccess->GetLineState(line);
}
int SetLineState(int line, int state) {
return pAccess->SetLineState(line, state);
}
// Style setting
void StartAt(unsigned int start, char chMask=31) {
// Store the mask specified for use with StyleAt.
mask = chMask;
pAccess->StartStyling(start, chMask);
startPosStyling = start;
}
void SetFlags(char chFlags_, char chWhile_) {
chFlags = chFlags_;
chWhile = chWhile_;
}
unsigned int GetStartSegment() const {
return startSeg;
}
void StartSegment(unsigned int pos) {
startSeg = pos;
}
void ColourTo(unsigned int pos, int chAttr) {
// Only perform styling if non empty range
if (pos != startSeg - 1) {
assert(pos >= startSeg);
if (pos < startSeg) {
return;
}
if (validLen + (pos - startSeg + 1) >= bufferSize)
Flush();
if (validLen + (pos - startSeg + 1) >= bufferSize) {
// Too big for buffer so send directly
pAccess->SetStyleFor(pos - startSeg + 1, static_cast<char>(chAttr));
} else {
if (chAttr != chWhile)
chFlags = 0;
chAttr = static_cast<char>(chAttr | chFlags);
for (unsigned int i = startSeg; i <= pos; i++) {
assert((startPosStyling + validLen) < Length());
styleBuf[validLen++] = static_cast<char>(chAttr);
}
}
}
startSeg = pos+1;
}
void SetLevel(int line, int level) {
pAccess->SetLevel(line, level);
}
void IndicatorFill(int start, int end, int indicator, int value) {
pAccess->DecorationSetCurrentIndicator(indicator);
pAccess->DecorationFillRange(start, value, end - start);
}
void ChangeLexerState(int start, int end) {
pAccess->ChangeLexerState(start, end);
}
};
#ifdef SCI_NAMESPACE
}
#endif
#endif

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