Moved StyleContext (previously called ColouriseContext) from LexCPP and

LexEiffel into own files.

1 files changed, 127 insertions, 0 deletions

diff --git a/src/StyleContext.h b/src/StyleContext.h
new file mode 100644
index 000000000..5bc6371fd
--- /dev/null
+++ b/src/StyleContext.h
@@ -0,0 +1,127 @@
+// 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');
+}