From 6dc13618762576ea94f64226e91c69e6a1a3bec4 Mon Sep 17 00:00:00 2001
From: nyamatongwe <unknown>
Date: Tue, 14 Oct 2003 10:16:08 +0000
Subject: Patch from Chuanjian Shen:     1.) "forall" and "where" statement
 folding bug.     2.) simple folding with "do label" structure.     3.) label
 colourise bug.     4.) number colourise bug (such as 1.D0)

---
 src/LexFortran.cxx | 356 +++++++++++++++++++++++++++++++++++++----------------
 1 file changed, 247 insertions(+), 109 deletions(-)

(limited to 'src')

diff --git a/src/LexFortran.cxx b/src/LexFortran.cxx
index e2109a0ab..72de3193a 100644
--- a/src/LexFortran.cxx
+++ b/src/LexFortran.cxx
@@ -1,51 +1,63 @@
 // Scintilla source code edit control
 /** @file LexFortran.cxx
  ** Lexer for Fortran.
- ** Writen by Chuan-jian Shen, Last changed Nov. 2002
+ ** Writen by Chuan-jian Shen, Last changed Sep. 2003
  **/
 // 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));
 }
-
+/***************************************/
 inline bool IsABlank(unsigned int ch) {
     return (ch == ' ') || (ch == 0x09) || (ch == 0x0b) ;
 }
-static void ColouriseFortranDoc(unsigned int startPos, int length, int initStyle, WordList *keywordlists[],
-                            Accessor &styler, bool isFixFormat) {
-
+/***************************************/
+inline bool IsALineEnd(char ch) {
+    return ((ch == '\n') || (ch == '\r')) ;
+}
+/***************************************/
+unsigned int GetContinuedPos(unsigned int pos, Accessor &styler) {
+	while (!IsALineEnd(styler.SafeGetCharAt(pos++))) continue;
+	if (styler.SafeGetCharAt(pos) == '\n') pos++;
+	while (IsABlank(styler.SafeGetCharAt(pos++))) continue;
+	char chCur = styler.SafeGetCharAt(pos);
+	if (chCur == '&') {
+		while (IsABlank(styler.SafeGetCharAt(++pos))) continue;
+		return pos;
+	} else {
+		return pos;
+	}
+}
+/***************************************/
+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, prevState = 0;
+	/***************************************/
+	int posLineStart = 0, numNonBlank = 0, prevState = 0;
 	int endPos = startPos + length;
-
-	// backtrack to the beginning of the document, this may be slow for big documents.
-	// initStyle = SCE_F_DEFAULT;
-	// StyleContext sc(0, startPos+length, initStyle, styler);
-
+	/***************************************/
 	// backtrack to the nearest keyword
 	while ((startPos > 1) && (styler.StyleAt(startPos) != SCE_F_WORD)) {
 		startPos--;
@@ -53,22 +65,47 @@ static void ColouriseFortranDoc(unsigned int startPos, int length, int initStyle
 	startPos = styler.LineStart(styler.GetLine(startPos));
 	initStyle = styler.StyleAt(startPos - 1);
 	StyleContext sc(startPos, endPos-startPos, initStyle, styler);
-
+	/***************************************/
 	for (; sc.More(); sc.Forward()) {
-
-		// remember the position of the line
+		// remember the start position of the line
 		if (sc.atLineStart) {
 			posLineStart = sc.currentPos;
+			numNonBlank = 0;
 			sc.SetState(SCE_F_DEFAULT);
 		}
-
+		if (!IsASpaceOrTab(sc.ch)) numNonBlank ++;
+		/***********************************************/
+		// Handle the fix format generically
+		int toLineStart = sc.currentPos - posLineStart;
+		if (isFixFormat && (toLineStart < 6 || toLineStart > 72)) {
+			if (toLineStart == 0 && (tolower(sc.ch) == 'c' || sc.ch == '*') || sc.ch == '!') {
+				sc.SetState(SCE_F_COMMENT);
+				while (!sc.atLineEnd && sc.More()) sc.Forward(); // Until line end
+			} else if (toLineStart > 72) {
+				sc.SetState(SCE_F_COMMENT);
+				while (!sc.atLineEnd && sc.More()) sc.Forward(); // Until line end
+			} else if (toLineStart < 5) {
+				if (IsADigit(sc.ch))
+					sc.SetState(SCE_F_LABEL);
+				else
+					sc.SetState(SCE_F_DEFAULT);
+			} else if (toLineStart == 5) {
+				if (!IsASpace(sc.ch) && sc.ch != '0') {
+					sc.SetState(SCE_F_CONTINUATION);
+					sc.ForwardSetState(prevState);
+				} else
+					sc.SetState(SCE_F_DEFAULT);
+			}
+			continue;
+		}
+		/***************************************/
 		// Handle line continuation generically.
-		if (sc.ch == '&') {
+		if (!isFixFormat && sc.ch == '&') {
 			char chTemp = ' ';
 			int j = 1;
 			while (IsABlank(chTemp) && j<132) {
 				chTemp = static_cast<char>(sc.GetRelative(j));
-				j ++;
+				j++;
 			}
 			if (chTemp == '!') {
 				sc.SetState(SCE_F_CONTINUATION);
@@ -76,24 +113,21 @@ static void ColouriseFortranDoc(unsigned int startPos, int length, int initStyle
 			} else if (chTemp == '\r' || chTemp == '\n') {
 				int currentState = sc.state;
 				sc.SetState(SCE_F_CONTINUATION);
-				if (currentState == SCE_F_STRING1 || currentState == SCE_F_STRING2) {
-					sc.ForwardSetState(SCE_F_DEFAULT);
-					while (IsASpace(sc.ch) && sc.More()) sc.Forward();
-					if (sc.ch == '&') {
-						sc.SetState(SCE_F_CONTINUATION);
-						sc.Forward();
-					}
-					sc.SetState(currentState);
+				sc.ForwardSetState(SCE_F_DEFAULT);
+				while (IsASpace(sc.ch) && sc.More()) sc.Forward();
+				if (sc.ch == '&') {
+					sc.SetState(SCE_F_CONTINUATION);
+					sc.Forward();
 				}
+				sc.SetState(currentState);
 			}
-			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)) {
+			if (!(IsAWordChar(sc.ch) || sc.ch=='\'' || sc.ch=='\"' || sc.ch=='.')) {
 				sc.SetState(SCE_F_DEFAULT);
 			}
 		} else if (sc.state == SCE_F_IDENTIFIER) {
@@ -123,24 +157,14 @@ static void ColouriseFortranDoc(unsigned int startPos, int length, int initStyle
 					prevState = SCE_F_DEFAULT;
 				}
 			} else if (sc.atLineEnd) {
-				if (isFixFormat) {
-					sc.ForwardSetState(SCE_F_DEFAULT);
-					posLineStart = sc.currentPos;
-				} else {
-					sc.ChangeState(SCE_F_STRINGEOL);
-					sc.ForwardSetState(SCE_F_DEFAULT);
-				}
+				sc.ChangeState(SCE_F_STRINGEOL);
+				sc.ForwardSetState(SCE_F_DEFAULT);
 			}
 		} else if (sc.state == SCE_F_STRING2) {
 			prevState = sc.state;
 			if (sc.atLineEnd) {
-				if (isFixFormat) {
-					sc.ForwardSetState(SCE_F_DEFAULT);
-					posLineStart = sc.currentPos;
-				} else {
-					sc.ChangeState(SCE_F_STRINGEOL);
-					sc.ForwardSetState(SCE_F_DEFAULT);
-				}
+				sc.ChangeState(SCE_F_STRINGEOL);
+				sc.ForwardSetState(SCE_F_DEFAULT);
 			} else if (sc.ch == '\"') {
 				if (sc.chNext == '\"') {
 					sc.Forward();
@@ -156,33 +180,32 @@ static void ColouriseFortranDoc(unsigned int startPos, int length, int initStyle
 		} else if (sc.state == SCE_F_CONTINUATION) {
 			sc.SetState(SCE_F_DEFAULT);
 		} else if (sc.state == SCE_F_LABEL) {
-			if (sc.currentPos >= static_cast<unsigned int>(posLineStart+5)) {
+			if (!IsADigit(sc.ch)) {
 				sc.SetState(SCE_F_DEFAULT);
+			} else {
+				if (isFixFormat && sc.currentPos-posLineStart > 4)
+					sc.SetState(SCE_F_DEFAULT);
+				else if (numNonBlank > 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.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 && (!IsASpace(sc.ch) && sc.ch != '0')) {
-					sc.SetState(SCE_F_CONTINUATION);
-					sc.ForwardSetState(prevState);
-				}
+			if (sc.ch == '!') {
+				sc.SetState(SCE_F_COMMENT);
+			} else if ((!isFixFormat) && IsADigit(sc.ch) && numNonBlank == 1) {
+				sc.SetState(SCE_F_LABEL);
 			} else if (IsADigit(sc.ch) || (sc.ch == '.' && IsADigit(sc.chNext))) {
 				sc.SetState(SCE_F_NUMBER);
+			} else if ((tolower(sc.ch) == 'b' || tolower(sc.ch) == 'o' ||
+					    tolower(sc.ch) == 'z') && (sc.chNext == '\"' || sc.chNext == '\'')) {
+				sc.SetState(SCE_F_NUMBER);
+				sc.Forward();
 			} 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 == '\'') {
@@ -194,37 +217,46 @@ static void ColouriseFortranDoc(unsigned int startPos, int length, int initStyle
 	}
 	sc.Complete();
 }
-
-// The folding depends on the mercy of the programer.
-static int classifyFoldPointFortran(const char* s, const char* prevWord) {
+/***************************************/
+// To determine the folding level depending on keywords
+static int classifyFoldPointFortran(const char* s, const char* prevWord, const char chNextNonBlank) {
 	int lev = 0;
-	if (strcmp(prevWord, "end") == 0) return lev;
 	if ((strcmp(prevWord, "else") == 0 && strcmp(s, "if") == 0) || strcmp(s, "elseif") == 0)
 		return -1;
 	if (strcmp(s, "associate") == 0 || strcmp(s, "block") == 0
 	    || strcmp(s, "blockdata") == 0 || strcmp(s, "select") == 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, "where") == 0) {
-		lev = 1;
-	} else if (strcmp(s, "end") == 0 || strcmp(s, "continue") == 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, "endwhere") == 0 || strcmp(s, "procedure") == 0 ) {
-		lev = -1;
+	    || 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 && chNextNonBlank != '(') ){
+			if (strcmp(prevWord, "end") == 0)
+				lev = 0;
+			else
+				lev = 1;
+	} else if (strcmp(s, "end") == 0 && chNextNonBlank != '='
+		|| 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
+		|| strcmp(s, "procedure") == 0 ) { // Take care of the module procedure statement
+			lev = -1;
+	} else if (strcmp(prevWord, "end") == 0 && strcmp(s, "if") == 0){ // end if
+			lev = 0;
 	}
 	return lev;
 }
-static void FoldFortranDoc(unsigned int startPos, int length, int initStyle, WordList *[], Accessor &styler) {
-	//~ bool foldComment = styler.GetPropertyInt("fold.comment") != 0;
+// Folding the code
+static void FoldFortranDoc(unsigned int startPos, int length, int initStyle,
+						   Accessor &styler, bool isFixFormat) {
+	//
+	// 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;
@@ -232,37 +264,135 @@ static void FoldFortranDoc(unsigned int startPos, int length, int initStyle, Wor
 	int levelPrev = styler.LevelAt(lineCurrent) & SC_FOLDLEVELNUMBERMASK;
 	int levelCurrent = levelPrev;
 	char chNext = styler[startPos];
+	char chNextNonBlank;
 	int styleNext = styler.StyleAt(startPos);
 	int style = initStyle;
-
+	/***************************************/
 	int lastStart = 0;
-	char prevWord[32] = "";
-
+	char prevWord[32] = "", Label[6] = "";
+	// Variables for do label folding.
+	static int doLabels[100], posLabel=-1;
+	/***************************************/
 	for (unsigned int i = startPos; i < endPos; i++) {
 		char ch = chNext;
 		chNext = styler.SafeGetCharAt(i + 1);
+		chNextNonBlank = chNext;
+		unsigned int j=i+1;
+		while(IsABlank(chNextNonBlank) && j<endPos) {
+			j ++ ;
+			chNextNonBlank = styler.SafeGetCharAt(j);
+		}
 		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.
+		//
+		if (stylePrev == SCE_F_DEFAULT && (style == SCE_F_WORD || style == SCE_F_LABEL)) {
+			// Store last word and label 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]));
+				unsigned int k;
+				for(k=0; (k<31 ) && (k<i-lastStart+1 ); k++) {
+					s[k] = static_cast<char>(tolower(styler[lastStart+k]));
+				}
+				s[k] = '\0';
+				// Handle the forall and where statement and structure.
+				if (strcmp(s, "forall") == 0 || strcmp(s, "where") == 0) {
+					if (strcmp(prevWord, "end") == 0) {
+						levelCurrent--;
+					} else {
+						j = i + 1;
+						char chBrace = '(', chSeek = ')', ch1 = styler.SafeGetCharAt(j);
+						// Find the position of the first (
+						while (ch1 != chBrace && j<endPos) {
+							j++;
+							ch1 = styler.SafeGetCharAt(j);
+						}
+						char styBrace = styler.StyleAt(j);
+						int depth = 1;
+						char chAtPos;
+						char styAtPos;
+						while (j<endPos) {
+							j++;
+							chAtPos = styler.SafeGetCharAt(j);
+							styAtPos = styler.StyleAt(j);
+							if (styAtPos == styBrace) {
+								if (chAtPos == chBrace) depth++;
+								if (chAtPos == chSeek) depth--;
+								if (depth == 0) break;
+							}
+						}
+						while (j<endPos) {
+							j++;
+							chAtPos = styler.SafeGetCharAt(j);
+							styAtPos = styler.StyleAt(j);
+							if (styAtPos == SCE_F_COMMENT || IsABlank(chAtPos)) continue;
+							if (isFixFormat) {
+								if (!IsALineEnd(chAtPos)) {
+									break;
+								} else {
+									if (lineCurrent < styler.GetLine(styler.Length()-1)) {
+										j = styler.LineStart(lineCurrent+1);
+										if (styler.StyleAt(j+5) == SCE_F_CONTINUATION) {
+											j += 5;
+											continue;
+										} else {
+											levelCurrent++;
+											break;
+										}
+									}
+								}
+							} else {
+								if (chAtPos == '&' && styler.StyleAt(j) == SCE_F_CONTINUATION) {
+									j = GetContinuedPos(j+1, styler);
+									continue;
+								} else if (IsALineEnd(chAtPos)) {
+									levelCurrent ++;
+									break;
+								} else {
+									break;
+								}
+							}
+						}
+					}
+				} else {
+					levelCurrent += classifyFoldPointFortran(s, prevWord, chNextNonBlank);
+					// Store the do Labels into array
+					if (strcmp(s, "do") == 0 && IsADigit(chNextNonBlank)) {
+						unsigned int k = 0;
+						for (i=j; (i<j+5 && i<endPos); i++) {
+							ch = styler.SafeGetCharAt(i);
+							if (IsADigit(ch))
+								Label[k++] = ch;
+							else
+								break;
+						}
+						Label[k] = '\0';
+						posLabel ++;
+						doLabels[posLabel] = atoi(Label);
+					}
 				}
-				s[j] = '\0';
-				levelCurrent += classifyFoldPointFortran(s, prevWord);
 				strcpy(prevWord, s);
 			}
+		} else if (style == SCE_F_LABEL) {
+			if(IsADigit(ch) && !IsADigit(chNext)) {
+				for(j = 0; ( j < 5 ) && ( j < i-lastStart+1 ); j++) {
+					ch = styler.SafeGetCharAt(lastStart + j);
+					if (IsADigit(ch) && styler.StyleAt(lastStart+j) == SCE_F_LABEL)
+						Label[j] = ch;
+					else
+						break;
+				}
+				Label[j] = '\0';
+				while (doLabels[posLabel] == atoi(Label) && posLabel > -1) {
+					levelCurrent--;
+					posLabel--;
+				}
+			}
 		}
 		if (atEOL) {
 			int lev = levelPrev;
@@ -278,33 +408,41 @@ static void FoldFortranDoc(unsigned int startPos, int length, int initStyle, Wor
 			visibleChars = 0;
 			strcpy(prevWord, "");
 		}
-
-		if (!isspacechar(ch))
-			visibleChars++;
+		/***************************************/
+		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);
+/***************************************/
+static void FoldFortranDocFreeFormat(unsigned int startPos, int length, int initStyle,
+		WordList *[], Accessor &styler) {
+	FoldFortranDoc(startPos, length, initStyle,styler, false);
+}
+/***************************************/
+static void FoldFortranDocFixFormat(unsigned int startPos, int length, int initStyle,
+		WordList *[], Accessor &styler) {
+	FoldFortranDoc(startPos, length, initStyle,styler, true);
+}
+/***************************************/
+LexerModule lmFortran(SCLEX_FORTRAN, ColouriseFortranDocFreeFormat, "fortran", FoldFortranDocFreeFormat, FortranWordLists);
+LexerModule lmF77(SCLEX_F77, ColouriseFortranDocFixFormat, "f77", FoldFortranDocFixFormat, FortranWordLists);
-- 
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