New lexer for Matlab contributed by José Fonseca.

1 files changed, 168 insertions, 0 deletions

diff --git a/src/LexMatlab.cxx b/src/LexMatlab.cxx
new file mode 100644
index 000000000..5ba0069a5
--- /dev/null
+++ b/src/LexMatlab.cxx
@@ -0,0 +1,168 @@
+// Scintilla source code edit control
+/** @file LexMatlab.cxx
+ ** Lexer for Matlab.
+ ** Written by José Fonseca
+ **/
+// Copyright 1998-2001 by Neil Hodgson <neilh@scintilla.org>
+// The License.txt file describes the conditions under which this software may be distributed.
+
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <stdio.h>
+#include <stdarg.h>
+
+#include "Platform.h"
+
+#include "PropSet.h"
+#include "Accessor.h"
+#include "StyleContext.h"
+#include "KeyWords.h"
+#include "Scintilla.h"
+#include "SciLexer.h"
+
+static bool IsMatlabComment(Accessor &styler, int pos, int len) {
+	return len>0 && (styler[pos]=='%' || styler[pos]=='!') ;
+}
+
+static inline bool IsAWordChar(const int ch) {
+	return (ch < 0x80) && (isalnum(ch) || ch == '_');
+}
+
+static inline bool IsAWordStart(const int ch) {
+	return (ch < 0x80) && (isalnum(ch) || ch == '_');
+}
+
+static void ColouriseMatlabDoc(unsigned int startPos, int length, int initStyle,
+                               WordList *keywordlists[], Accessor &styler) {
+
+	WordList &keywords = *keywordlists[0];
+
+	styler.StartAt(startPos);
+	
+	bool transpose = false;
+
+	StyleContext sc(startPos, length, initStyle, styler);
+
+	for (; sc.More(); sc.Forward()) {
+
+		if (sc.state == SCE_MATLAB_OPERATOR) {
+			if (sc.chPrev == '.') {
+				if (sc.ch == '*' || sc.ch == '/' || sc.ch == '\\' || sc.ch == '^') {
+					transpose = false;
+				} else if (sc.ch == '\'') {
+					transpose = true;
+				} else {
+					sc.SetState(SCE_MATLAB_DEFAULT);
+					transpose = false;
+				}
+			} else {
+				sc.SetState(SCE_MATLAB_DEFAULT);
+				transpose = false;
+			}
+			sc.SetState(SCE_MATLAB_DEFAULT);
+			transpose = false;
+		} else if (sc.state == SCE_MATLAB_KEYWORD) {
+			if (!isalnum(sc.ch) && sc.ch != '_') {
+				char s[100];
+				sc.GetCurrentLowered(s, sizeof(s));
+				if (keywords.InList(s)) {
+					sc.SetState(SCE_MATLAB_DEFAULT);
+					transpose = false;
+				} else {
+					sc.ChangeState(SCE_MATLAB_IDENTIFIER);
+					sc.SetState(SCE_MATLAB_DEFAULT);
+					transpose = true;
+				}
+			}
+		} else if (sc.state == SCE_MATLAB_NUMBER) {
+			if (!isdigit(sc.ch) && sc.ch != '.' 
+			    && !(sc.ch == 'e' || sc.ch == 'E')
+				&& !((sc.ch == '+' || sc.ch == '-') && (sc.chPrev == 'e' || sc.chPrev == 'E'))) {
+				sc.SetState(SCE_MATLAB_DEFAULT);
+				transpose = true;
+			}
+		} else if (sc.state == SCE_MATLAB_STRING) {
+			// Matlab doubles quotes to preserve them, so just end this string 
+			// state now as a following quote will start again
+			if (sc.ch == '\'') {
+				sc.ForwardSetState(SCE_MATLAB_DEFAULT);
+			}
+		} else if (sc.state == SCE_MATLAB_COMMENT || sc.state == SCE_MATLAB_COMMAND) {
+			if (sc.atLineEnd) {
+				sc.SetState(SCE_MATLAB_DEFAULT);
+				transpose = false;
+			}
+		}
+		
+		if (sc.state == SCE_MATLAB_DEFAULT) {
+			if (sc.ch == '%') {
+				sc.SetState(SCE_MATLAB_COMMENT);
+			} else if (sc.ch == '!') {
+				sc.SetState(SCE_MATLAB_COMMAND);
+			} else if (sc.ch == '\'') {
+				if (transpose) {
+					sc.SetState(SCE_MATLAB_OPERATOR);
+				} else {
+					sc.SetState(SCE_MATLAB_STRING);
+				}
+			} else if (isdigit(sc.ch) || (sc.ch == '.' && isdigit(sc.chNext))) {
+				sc.SetState(SCE_MATLAB_NUMBER);
+			} else if (isalpha(sc.ch)) {
+				sc.SetState(SCE_MATLAB_KEYWORD);
+			} else if (isoperator(static_cast<char>(sc.ch)) || sc.ch == '@' || sc.ch == '\\') {
+				if (sc.ch == ')' || sc.ch == ']') {
+					transpose = true;
+				}
+				sc.SetState(SCE_MATLAB_OPERATOR);
+			} else {
+				transpose = false;
+			}
+		}
+	}
+	sc.Complete();
+}
+
+static void FoldMatlabDoc(unsigned int startPos, int length, int,
+						   WordList *[], Accessor &styler) {
+	int endPos = startPos + length;
+
+	// Backtrack to previous line in case need to fix its fold status
+	int lineCurrent = styler.GetLine(startPos);
+	if (startPos > 0) {
+		if (lineCurrent > 0) {
+			lineCurrent--;
+			startPos = styler.LineStart(lineCurrent);
+		}
+	}
+	int spaceFlags = 0;
+	int indentCurrent = styler.IndentAmount(lineCurrent, &spaceFlags, IsMatlabComment);
+	char chNext = styler[startPos];
+	for (int i = startPos; i < endPos; i++) {
+		char ch = chNext;
+		chNext = styler.SafeGetCharAt(i + 1);
+
+		if ((ch == '\r' && chNext != '\n') || (ch == '\n') || (i == endPos)) {
+			int lev = indentCurrent;
+			int indentNext = styler.IndentAmount(lineCurrent + 1, &spaceFlags, IsMatlabComment);
+			if (!(indentCurrent & SC_FOLDLEVELWHITEFLAG)) {
+				// Only non whitespace lines can be headers
+				if ((indentCurrent & SC_FOLDLEVELNUMBERMASK) < (indentNext & SC_FOLDLEVELNUMBERMASK)) {
+					lev |= SC_FOLDLEVELHEADERFLAG;
+				} else if (indentNext & SC_FOLDLEVELWHITEFLAG) {
+					// Line after is blank so check the next - maybe should continue further?
+					int spaceFlags2 = 0;
+					int indentNext2 = styler.IndentAmount(lineCurrent + 2, &spaceFlags2, IsMatlabComment);
+					if ((indentCurrent & SC_FOLDLEVELNUMBERMASK) < (indentNext2 & SC_FOLDLEVELNUMBERMASK)) {
+						lev |= SC_FOLDLEVELHEADERFLAG;
+					}
+				}
+			}
+			indentCurrent = indentNext;
+			styler.SetLevel(lineCurrent, lev);
+			lineCurrent++;
+		}
+	}
+}
+
+LexerModule lmMatlab(SCLEX_MATLAB, ColouriseMatlabDoc, "matlab", FoldMatlabDoc);