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// Scintilla source code edit control
/** @file StyleContext.cxx
** Lexer infrastructure.
**/
// Copyright 1998-2001 by Neil Hodgson <neilh@scintilla.org>
// This file is in the public domain.
// All languages handled so far can treat all characters >= 0x80 as one class
// which just continues the current token or starts an identifier if in default.
// DBCS treated specially as the second character can be < 0x80 and hence
// syntactically significant. UTF-8 avoids this as all trail bytes are >= 0x80
class StyleContext {
Accessor &styler;
int endPos;
StyleContext& operator=(const StyleContext&) {
return *this;
}
public:
int currentPos;
bool atLineStart;
bool atLineEnd;
int state;
int chPrev;
int ch;
int chNext;
StyleContext(unsigned int startPos, int length,
int initStyle, Accessor &styler_, char chMask=31) :
styler(styler_),
endPos(startPos + length),
currentPos(startPos),
atLineStart(true),
atLineEnd(false),
state(initStyle),
chPrev(0),
ch(0),
chNext(0) {
styler.StartAt(startPos, chMask);
styler.StartSegment(startPos);
int pos = currentPos;
ch = static_cast<unsigned char>(styler.SafeGetCharAt(pos));
if (styler.IsLeadByte(static_cast<char>(ch))) {
pos++;
ch = ch << 8;
ch |= static_cast<unsigned char>(styler.SafeGetCharAt(pos));
}
chNext = static_cast<unsigned char>(styler.SafeGetCharAt(pos+1));
if (styler.IsLeadByte(static_cast<char>(chNext))) {
chNext = chNext << 8;
chNext |= static_cast<unsigned char>(styler.SafeGetCharAt(pos+2));
}
atLineEnd = (ch == '\r' && chNext != '\n') || (ch == '\n') || (currentPos >= endPos);
}
void Complete() {
styler.ColourTo(currentPos - 1, state);
}
bool More() {
return currentPos <= endPos;
}
void Forward() {
atLineStart = atLineEnd;
// A lot of this is repeated from the constructor - TODO: merge code
chPrev = ch;
currentPos++;
if (ch >= 0x100)
currentPos++;
ch = chNext;
chNext = static_cast<unsigned char>(styler.SafeGetCharAt(currentPos+1));
if (styler.IsLeadByte(static_cast<char>(chNext))) {
chNext = chNext << 8;
chNext |= static_cast<unsigned char>(styler.SafeGetCharAt(currentPos + 2));
}
// Trigger on CR only (Mac style) or either on LF from CR+LF (Dos/Win) or on LF alone (Unix)
// Avoid triggering two times on Dos/Win
// End of line
atLineEnd = (ch == '\r' && chNext != '\n') || (ch == '\n') || (currentPos >= endPos);
}
void ChangeState(int state_) {
state = state_;
}
void SetState(int state_) {
styler.ColourTo(currentPos - 1, state);
state = state_;
}
void ForwardSetState(int state_) {
Forward();
styler.ColourTo(currentPos - 1, state);
state = state_;
}
int LengthCurrent() {
return currentPos - styler.GetStartSegment();
}
int GetRelative(int n) {
return styler.SafeGetCharAt(currentPos+n);
}
bool Match(char ch0) {
return ch == ch0;
}
bool Match(char ch0, char ch1) {
return (ch == ch0) && (chNext == ch1);
}
bool Match(const char *s) {
if (ch != *s)
return false;
s++;
if (chNext != *s)
return false;
s++;
for (int n=2; *s; n++) {
if (*s != styler.SafeGetCharAt(currentPos+n))
return false;
s++;
}
return true;
}
// Non-inline
void GetCurrent(char *s, int len);
void GetCurrentLowered(char *s, int len);
};
inline bool IsASpace(unsigned int ch) {
return (ch == ' ') || ((ch >= 0x09) && (ch <= 0x0d));
}
inline bool IsADigit(unsigned int ch) {
return (ch >= '0') && (ch <= '9');
}
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