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LexFortran.cxx

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// Scintilla source code edit control
/** @file LexFortran.cxx
 ** Lexer for Fortran.
 ** Writen by Chuan-jian Shen, Last changed Nov. 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));
}

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) {

      WordList &keywords = *keywordlists[0];
      WordList &keywords2 = *keywordlists[1];
      WordList &keywords3 = *keywordlists[2];

      int posLineStart = 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--;
      }
      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
            if (sc.atLineStart) {
                  posLineStart = sc.currentPos;
                  sc.SetState(SCE_F_DEFAULT);
            }

            // Handle line continuation generically.
            if (sc.ch == '&') {
                  char chTemp = ' ';
                  int j = 1;
                  while (IsABlank(chTemp) && j<132) {
                        chTemp = static_cast<char>(sc.GetRelative(j));
                        j ++;
                  }
                  if (chTemp == '!') {
                        sc.SetState(SCE_F_CONTINUATION);
                        if (sc.chNext == '!') sc.ForwardSetState(SCE_F_COMMENT);
                  } 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);
                        }
                  }
                  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) {
                  prevState = sc.state;
                  if (sc.ch == '\'') {
                        if (sc.chNext == '\'') {
                              sc.Forward();
                        } else {
                              sc.ForwardSetState(SCE_F_DEFAULT);
                              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);
                        }
                  }
            } 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);
                        }
                  } else if (sc.ch == '\"') {
                        if (sc.chNext == '\"') {
                              sc.Forward();
                        } else {
                              sc.ForwardSetState(SCE_F_DEFAULT);
                              prevState = 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 >= static_cast<unsigned int>(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.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);
                        }
                  } 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();
}

// The folding depends on the mercy of the programer.
static int classifyFoldPointFortran(const char* s, const char* prevWord) {
      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;
      }
      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);

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