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// Scintilla source code edit control
/** @file StyleContext.cxx
** Lexer infrastructure.
**/
// Copyright 1998-2004 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;
unsigned int endPos;
StyleContext& operator=(const StyleContext&) {
return *this;
}
void GetNextChar(unsigned int 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));
}
// End of line?
// 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.
atLineEnd = (ch == '\r' && chNext != '\n') ||
(ch == '\n') ||
(currentPos >= endPos);
}
public:
unsigned int currentPos;
bool atLineStart;
bool atLineEnd;
int state;
int chPrev;
int ch;
int chNext;
StyleContext(unsigned int startPos, unsigned int length,
int initStyle, Accessor &styler_, char chMask=31) :
styler(styler_),
endPos(startPos + length),
currentPos(startPos),
atLineStart(true),
atLineEnd(false),
state(initStyle & chMask), // Mask off all bits which aren't in the chMask.
chPrev(0),
ch(0),
chNext(0) {
styler.StartAt(startPos, chMask);
styler.StartSegment(startPos);
unsigned 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));
}
GetNextChar(pos);
}
void Complete() {
styler.ColourTo(currentPos - 1, state);
}
bool More() {
return currentPos < endPos;
}
void Forward() {
if (currentPos < endPos) {
atLineStart = atLineEnd;
chPrev = ch;
currentPos++;
if (ch >= 0x100)
currentPos++;
ch = chNext;
GetNextChar(currentPos + ((ch >= 0x100) ? 1 : 0));
} else {
atLineStart = false;
chPrev = ' ';
ch = ' ';
chNext = ' ';
atLineEnd = true;
}
}
void Forward(int nb) {
for (int i = 0; i < nb; i++) {
Forward();
}
}
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 static_cast<unsigned char>(styler.SafeGetCharAt(currentPos+n));
}
bool Match(char ch0) {
return ch == static_cast<unsigned char>(ch0);
}
bool Match(char ch0, char ch1) {
return (ch == static_cast<unsigned char>(ch0)) && (chNext == static_cast<unsigned char>(ch1));
}
bool Match(const char *s) {
if (ch != static_cast<unsigned char>(*s))
return false;
s++;
if (chNext != static_cast<unsigned char>(*s))
return false;
s++;
for (int n=2; *s; n++) {
if (*s != styler.SafeGetCharAt(currentPos+n))
return false;
s++;
}
return true;
}
bool MatchIgnoreCase(const char *s) {
if (tolower(ch) != static_cast<unsigned char>(*s))
return false;
s++;
if (tolower(chNext) != static_cast<unsigned char>(*s))
return false;
s++;
for (int n=2; *s; n++) {
if (static_cast<unsigned char>(*s) !=
tolower(static_cast<unsigned char>(styler.SafeGetCharAt(currentPos+n))))
return false;
s++;
}
return true;
}
// Non-inline
void GetCurrent(char *s, unsigned int len);
void GetCurrentLowered(char *s, unsigned int len);
};
inline bool IsASpace(unsigned int ch) {
return (ch == ' ') || ((ch >= 0x09) && (ch <= 0x0d));
}
inline bool IsASpaceOrTab(unsigned int ch) {
return (ch == ' ') || (ch == '\t');
}
inline bool IsADigit(unsigned int ch) {
return (ch >= '0') && (ch <= '9');
}
inline bool IsADigit(unsigned int ch, unsigned int base) {
if (base <= 10) {
return (ch >= '0') && (ch < '0' + base);
} else {
return ((ch >= '0') && (ch <= '9')) ||
((ch >= 'A') && (ch < 'A' + base - 10)) ||
((ch >= 'a') && (ch < 'a' + base - 10));
}
}
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