New lexer for Fortran.

2 files changed, 276 insertions, 0 deletions

diff --git a/src/KeyWords.cxx b/src/KeyWords.cxx
index 7f77f2fad..d9682b606 100644
--- a/src/KeyWords.cxx
+++ b/src/KeyWords.cxx
@@ -153,6 +153,8 @@ int Scintilla_LinkLexers() {
 	LINK_LEXER(lmNncrontab);
 	LINK_LEXER(lmEiffel);
 	LINK_LEXER(lmEiffelkw);
+	LINK_LEXER(lmFortran);
+	LINK_LEXER(lmF77);
 	LINK_LEXER(lmHTML);
 	LINK_LEXER(lmXML);
 	LINK_LEXER(lmASP);
diff --git a/src/LexFortran.cxx b/src/LexFortran.cxx
new file mode 100644
index 000000000..85e84c58a
--- /dev/null
+++ b/src/LexFortran.cxx
@@ -0,0 +1,274 @@
+// Scintilla source code edit control
+/** @file LexFortran.cxx
+ ** Lexer for Fortran.
+ ** Writen by Chuan-jian Shen, Last changed Oct. 2002
+ **/
+// 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 inline bool IsAWordChar(const int ch) {
+	return (ch < 0x80) && (isalnum(ch) || ch == '_' || ch == '%');
+}
+
+static inline bool IsAWordStart(const int ch) {
+	return (ch < 0x80) && (isalnum(ch));
+}
+
+static void ColouriseFortranDoc(unsigned int startPos, int length, int initStyle, WordList *keywordlists[],
+                            Accessor &styler, bool isFixFormat) {
+
+	WordList &keywords = *keywordlists[0];
+	WordList &keywords2 = *keywordlists[1];
+	WordList &keywords3 = *keywordlists[2];
+
+	int posLineStart = 0;
+
+	StyleContext sc(startPos, length, initStyle, styler);
+
+	for (; sc.More(); sc.Forward()) {
+
+		if (sc.atLineStart) {
+			posLineStart = sc.currentPos;
+			if (sc.state == SCE_F_STRING1) {
+			    // Prevent SCE_F_STRINGEOL from leaking back to previous line
+			    sc.SetState(SCE_F_STRING1);
+			}
+			else if(sc.state == SCE_F_STRING2) {
+				sc.SetState(SCE_F_STRING2);
+			}
+		}
+
+		// Handle line continuation generically.
+		if (sc.ch == '&') {
+			if (sc.chNext == '\n' || sc.chNext == '\r') {
+				sc.Forward();
+				if (sc.ch == '\r' && sc.chNext == '\n') {
+					sc.Forward();
+				}
+				continue;
+			}
+		}
+
+		// Determine if the current state should terminate.
+		if (sc.state == SCE_F_OPERATOR) {
+			sc.SetState(SCE_F_DEFAULT);
+		} else if (sc.state == SCE_F_NUMBER) {
+			if (!IsAWordChar(sc.ch)) {
+				sc.SetState(SCE_F_DEFAULT);
+			}
+		} else if (sc.state == SCE_F_IDENTIFIER) {
+			if (!IsAWordChar(sc.ch) || (sc.ch == '%')) {
+				char s[100];
+				sc.GetCurrentLowered(s, sizeof(s));
+				if (keywords.InList(s)) {
+					sc.ChangeState(SCE_F_WORD);
+				} else if (keywords2.InList(s)) {
+					sc.ChangeState(SCE_F_WORD2);
+				} else if (keywords3.InList(s)) {
+					sc.ChangeState(SCE_F_WORD3);
+				}
+				sc.SetState(SCE_F_DEFAULT);
+			}
+		} else if (sc.state == SCE_F_COMMENT) {
+			if (sc.ch == '\r' || sc.ch == '\n') {
+				sc.SetState(SCE_F_DEFAULT);
+			}
+		} else if (sc.state == SCE_F_STRING1) {
+			if (sc.ch == '&') {
+				sc.Forward();
+			} else if (sc.ch == '\'') {
+				sc.Forward();
+				if (sc.chNext == '\'') {
+					sc.Forward();
+				} else {
+					sc.SetState(SCE_F_DEFAULT);
+				}
+			} else if (sc.atLineEnd) {
+				sc.ChangeState(SCE_F_STRINGEOL);
+				sc.ForwardSetState(SCE_F_DEFAULT);
+			}
+		} else if (sc.state == SCE_F_STRING2) {
+			if (sc.atLineEnd) {
+				sc.ChangeState(SCE_F_STRINGEOL);
+				sc.ForwardSetState(SCE_F_DEFAULT);
+			} else if (sc.ch == '&') {
+				sc.Forward();
+			} else if (sc.ch == '\"') {
+				sc.Forward();
+				if (sc.chNext == '\"') {
+					sc.Forward();
+				} else {
+					sc.SetState(SCE_F_DEFAULT);
+				}
+			}
+		} else if (sc.state == SCE_F_OPERATOR2) {
+			if (sc.ch == '.') {
+				sc.ForwardSetState(SCE_F_DEFAULT);
+			}
+		} else if (sc.state == SCE_F_CONTINUATION) {
+			sc.SetState(SCE_F_DEFAULT);
+		} else if (sc.state == SCE_F_LABEL) {
+			if (sc.currentPos >= posLineStart+5) {
+				sc.SetState(SCE_F_DEFAULT);
+			}
+		}
+
+		// Determine if a new state should be entered.
+		if (sc.state == SCE_F_DEFAULT) {
+			int toLineStart = sc.currentPos - posLineStart;
+			if (isFixFormat && (toLineStart < 6 || toLineStart > 72)) {
+				if (sc.atLineStart && (tolower(sc.ch) == 'c' || sc.ch == '*')) {
+					sc.SetState(SCE_F_COMMENT);
+				} else if (toLineStart > 72) {
+					sc.SetState(SCE_F_COMMENT);
+				} else if (toLineStart < 5 && !IsASpace(sc.ch)) {
+					sc.SetState(SCE_F_LABEL);
+				} else if (toLineStart == 5 && (sc.ch != ' ' || sc.ch != '0')) {
+					sc.SetState(SCE_F_CONTINUATION);
+				}
+			} else if (IsADigit(sc.ch) || (sc.ch == '.' && IsADigit(sc.chNext))) {
+				sc.SetState(SCE_F_NUMBER);
+			} else if (sc.ch == '.' && isalpha(sc.chNext)) {
+				sc.SetState(SCE_F_OPERATOR2);
+			} else if (IsAWordStart(sc.ch)) {
+				sc.SetState(SCE_F_IDENTIFIER);
+			} else if (sc.ch == '!') {
+				sc.SetState(SCE_F_COMMENT);
+			} else if (sc.ch == '\"') {
+				sc.SetState(SCE_F_STRING2);
+			} else if (sc.ch == '\'') {
+				sc.SetState(SCE_F_STRING1);
+			} else if (isoperator(static_cast<char>(sc.ch))) {
+				sc.SetState(SCE_F_OPERATOR);
+			}
+		}
+	}
+	sc.Complete();
+}
+
+static int classifyFoldPointFortran(const char* s, const char* prevWord) {
+	int lev = 0;
+	if (strcmp(prevWord, "end") == 0) return lev;
+	if (strcmp(s, "associate") == 0 || strcmp(s, "block") == 0
+	    || strcmp(s, "blockdata") == 0 || strcmp(s, "case") == 0
+	    || strcmp(s, "do") == 0 || strcmp(s, "enum") ==0
+	    || strcmp(s, "forall") == 0 || strcmp(s, "function") == 0
+	    || strcmp(s, "interface") == 0 || strcmp(s, "module") == 0
+	    || strcmp(s, "program") == 0 || strcmp(s, "subroutine") == 0
+	    || strcmp(s, "then") == 0 || strcmp(s, "type") == 0
+	    || strcmp(s, "where") == 0) {
+		lev = 1;
+	} else if (strcmp(s, "end") == 0
+	    || strcmp(s, "endassociate") == 0 || strcmp(s, "endblock") == 0
+	    || strcmp(s, "endblockdata") == 0 || strcmp(s, "endselect") == 0
+	    || strcmp(s, "enddo") == 0 || strcmp(s, "endenum") ==0
+	    || strcmp(s, "endif") == 0
+	    || strcmp(s, "endforall") == 0 || strcmp(s, "endfunction") == 0
+	    || strcmp(s, "endinterface") == 0 || strcmp(s, "endmodule") == 0
+	    || strcmp(s, "endprogram") == 0 || strcmp(s, "endsubroutine") == 0
+	    || strcmp(s, "endtype") == 0 || strcmp(s, "endwhere") == 0) {
+		lev = -1;
+	}
+	return lev;
+}
+static void FoldFortranDoc(unsigned int startPos, int length, int initStyle, WordList *[], Accessor &styler) {
+	//~ bool foldComment = styler.GetPropertyInt("fold.comment") != 0;
+	// Do not know how to fold the comment at the moment.
+	bool foldCompact = styler.GetPropertyInt("fold.compact", 1) != 0;
+	unsigned int endPos = startPos + length;
+	int visibleChars = 0;
+	int lineCurrent = styler.GetLine(startPos);
+	int levelPrev = styler.LevelAt(lineCurrent) & SC_FOLDLEVELNUMBERMASK;
+	int levelCurrent = levelPrev;
+	char chNext = styler[startPos];
+	int styleNext = styler.StyleAt(startPos);
+	int style = initStyle;
+
+	int lastStart = 0;
+	char prevWord[32] = "";
+
+	for (unsigned int i = startPos; i < endPos; i++) {
+		char ch = chNext;
+		chNext = styler.SafeGetCharAt(i + 1);
+		int stylePrev = style;
+		style = styleNext;
+		styleNext = styler.StyleAt(i + 1);
+		bool atEOL = (ch == '\r' && chNext != '\n') || (ch == '\n');
+
+		if (stylePrev == SCE_F_DEFAULT && style == SCE_F_WORD)
+		{
+			// Store last word start point.
+			lastStart = i;
+		}
+
+		if (style == SCE_F_WORD) {
+			if(iswordchar(ch) && !iswordchar(chNext)) {
+				char s[32];
+				unsigned int j;
+				for(j = 0; ( j < 31 ) && ( j < i-lastStart+1 ); j++) {
+					s[j] = static_cast<char>(tolower(styler[lastStart + j]));
+				}
+				s[j] = '\0';
+				levelCurrent += classifyFoldPointFortran(s, prevWord);
+				strcpy(prevWord, s);
+			}
+		}
+		if (atEOL) {
+			int lev = levelPrev;
+			if (visibleChars == 0 && foldCompact)
+				lev |= SC_FOLDLEVELWHITEFLAG;
+			if ((levelCurrent > levelPrev) && (visibleChars > 0))
+				lev |= SC_FOLDLEVELHEADERFLAG;
+			if (lev != styler.LevelAt(lineCurrent)) {
+				styler.SetLevel(lineCurrent, lev);
+			}
+			lineCurrent++;
+			levelPrev = levelCurrent;
+			visibleChars = 0;
+			strcpy(prevWord, "");
+		}
+
+		if (!isspacechar(ch))
+			visibleChars++;
+	}
+
+	// Fill in the real level of the next line, keeping the current flags as they will be filled in later
+	int flagsNext = styler.LevelAt(lineCurrent) & ~SC_FOLDLEVELNUMBERMASK;
+	styler.SetLevel(lineCurrent, levelPrev | flagsNext);
+}
+
+static const char * const FortranWordLists[] = {
+	"Primary keywords and identifiers",
+	"Intrinsic functions",
+	"Extended and user defined functions",
+	0,
+};
+
+static void ColouriseFortranDocFreeFormat(unsigned int startPos, int length, int initStyle, WordList *keywordlists[],
+                            Accessor &styler) {
+	ColouriseFortranDoc(startPos, length, initStyle, keywordlists, styler, false);
+}
+
+static void ColouriseFortranDocFixFormat(unsigned int startPos, int length, int initStyle, WordList *keywordlists[],
+                            Accessor &styler) {
+	ColouriseFortranDoc(startPos, length, initStyle, keywordlists, styler, true);
+}
+
+
+LexerModule lmFortran(SCLEX_FORTRAN, ColouriseFortranDocFreeFormat, "fortran", FoldFortranDoc, FortranWordLists);
+LexerModule lmF77(SCLEX_F77, ColouriseFortranDocFixFormat, "f77", FoldFortranDoc, FortranWordLists);