src/stc/scintilla/src/LexMatlab.cxx

   1 // Scintilla source code edit control
   2 /** @file LexMatlab.cxx
   3  ** Lexer for Matlab.
   4  ** Written by Jose' Fonseca
   5  **
   6  ** Changes by Christoph Dalitz 2003/12/04:
   7  **   - added support for Octave
   8  **   - Strings can now be included both in single or double quotes
   9  **/
  10 // Copyright 1998-2001 by Neil Hodgson <neilh@scintilla.org>
  11 // The License.txt file describes the conditions under which this software may be distributed.
  12
  13 #include <stdlib.h>
  14 #include <string.h>
  15 #include <ctype.h>
  16 #include <stdio.h>
  17 #include <stdarg.h>
  18
  19 #include "Platform.h"
  20
  21 #include "PropSet.h"
  22 #include "Accessor.h"
  23 #include "StyleContext.h"
  24 #include "KeyWords.h"
  25 #include "Scintilla.h"
  26 #include "SciLexer.h"
  27
  28 #ifdef SCI_NAMESPACE
  29 using namespace Scintilla;
  30 #endif
  31
  32 static bool IsMatlabCommentChar(int c) {
  33         return (c == '%') ;
  34 }
  35
  36 static bool IsOctaveCommentChar(int c) {
  37         return (c == '%' || c == '#') ;
  38 }
  39
  40 static bool IsMatlabComment(Accessor &styler, int pos, int len) {
  41         return len > 0 && IsMatlabCommentChar(styler[pos]) ;
  42 }
  43
  44 static bool IsOctaveComment(Accessor &styler, int pos, int len) {
  45         return len > 0 && IsOctaveCommentChar(styler[pos]) ;
  46 }
  47
  48 static inline bool IsAWordChar(const int ch) {
  49         return (ch < 0x80) && (isalnum(ch) || ch == '_');
  50 }
  51
  52 static inline bool IsAWordStart(const int ch) {
  53         return (ch < 0x80) && (isalnum(ch) || ch == '_');
  54 }
  55
  56 static void ColouriseMatlabOctaveDoc(
  57             unsigned int startPos, int length, int initStyle,
  58             WordList *keywordlists[], Accessor &styler,
  59             bool (*IsCommentChar)(int)) {
  60
  61         WordList &keywords = *keywordlists[0];
  62
  63         styler.StartAt(startPos);
  64
  65         bool transpose = false;
  66
  67         StyleContext sc(startPos, length, initStyle, styler);
  68
  69         for (; sc.More(); sc.Forward()) {
  70
  71                 if (sc.state == SCE_MATLAB_OPERATOR) {
  72                         if (sc.chPrev == '.') {
  73                                 if (sc.ch == '*' || sc.ch == '/' || sc.ch == '\\' || sc.ch == '^') {
  74                                         sc.ForwardSetState(SCE_MATLAB_DEFAULT);
  75                                         transpose = false;
  76                                 } else if (sc.ch == '\'') {
  77                                         sc.ForwardSetState(SCE_MATLAB_DEFAULT);
  78                                         transpose = true;
  79                                 } else {
  80                                         sc.SetState(SCE_MATLAB_DEFAULT);
  81                                 }
  82                         } else {
  83                                 sc.SetState(SCE_MATLAB_DEFAULT);
  84                         }
  85                 } else if (sc.state == SCE_MATLAB_KEYWORD) {
  86                         if (!isalnum(sc.ch) && sc.ch != '_') {
  87                                 char s[100];
  88                                 sc.GetCurrentLowered(s, sizeof(s));
  89                                 if (keywords.InList(s)) {
  90                                         sc.SetState(SCE_MATLAB_DEFAULT);
  91                                         transpose = false;
  92                                 } else {
  93                                         sc.ChangeState(SCE_MATLAB_IDENTIFIER);
  94                                         sc.SetState(SCE_MATLAB_DEFAULT);
  95                                         transpose = true;
  96                                 }
  97                         }
  98                 } else if (sc.state == SCE_MATLAB_NUMBER) {
  99                         if (!isdigit(sc.ch) && sc.ch != '.'
 100                                 && !(sc.ch == 'e' || sc.ch == 'E')
 101                                 && !((sc.ch == '+' || sc.ch == '-') && (sc.chPrev == 'e' || sc.chPrev == 'E'))) {
 102                                 sc.SetState(SCE_MATLAB_DEFAULT);
 103                                 transpose = true;
 104                         }
 105                 } else if (sc.state == SCE_MATLAB_STRING) {
 106                         if (sc.ch == '\\') {
 107                                 if (sc.chNext == '\"' || sc.chNext == '\'' || sc.chNext == '\\') {
 108                                         sc.Forward();
 109                                 }
 110                         } else if (sc.ch == '\'') {
 111                                 sc.ForwardSetState(SCE_MATLAB_DEFAULT);
 112                         }
 113                 } else if (sc.state == SCE_MATLAB_DOUBLEQUOTESTRING) {
 114                         if (sc.ch == '\\') {
 115                                 if (sc.chNext == '\"' || sc.chNext == '\'' || sc.chNext == '\\') {
 116                                         sc.Forward();
 117                                 }
 118                         } else if (sc.ch == '\"') {
 119                                 sc.ForwardSetState(SCE_MATLAB_DEFAULT);
 120                         }
 121                 } else if (sc.state == SCE_MATLAB_COMMENT || sc.state == SCE_MATLAB_COMMAND) {
 122                         if (sc.atLineEnd) {
 123                                 sc.SetState(SCE_MATLAB_DEFAULT);
 124                                 transpose = false;
 125                         }
 126                 }
 127
 128                 if (sc.state == SCE_MATLAB_DEFAULT) {
 129                         if (IsCommentChar(sc.ch)) {
 130                                 sc.SetState(SCE_MATLAB_COMMENT);
 131                         } else if (sc.ch == '!') {
 132                                 sc.SetState(SCE_MATLAB_COMMAND);
 133                         } else if (sc.ch == '\'') {
 134                                 if (transpose) {
 135                                         sc.SetState(SCE_MATLAB_OPERATOR);
 136                                 } else {
 137                                         sc.SetState(SCE_MATLAB_STRING);
 138                                 }
 139                         } else if (sc.ch == '"') {
 140                                 sc.SetState(SCE_MATLAB_DOUBLEQUOTESTRING);
 141                         } else if (isdigit(sc.ch) || (sc.ch == '.' && isdigit(sc.chNext))) {
 142                                 sc.SetState(SCE_MATLAB_NUMBER);
 143                         } else if (isalpha(sc.ch)) {
 144                                 sc.SetState(SCE_MATLAB_KEYWORD);
 145                         } else if (isoperator(static_cast<char>(sc.ch)) || sc.ch == '@' || sc.ch == '\\') {
 146                                 if (sc.ch == ')' || sc.ch == ']') {
 147                                         transpose = true;
 148                                 } else {
 149                                         transpose = false;
 150                                 }
 151                                 sc.SetState(SCE_MATLAB_OPERATOR);
 152                         } else {
 153                                 transpose = false;
 154                         }
 155                 }
 156         }
 157         sc.Complete();
 158 }
 159
 160 static void ColouriseMatlabDoc(unsigned int startPos, int length, int initStyle,
 161                                WordList *keywordlists[], Accessor &styler) {
 162         ColouriseMatlabOctaveDoc(startPos, length, initStyle, keywordlists, styler, IsMatlabCommentChar);
 163 }
 164
 165 static void ColouriseOctaveDoc(unsigned int startPos, int length, int initStyle,
 166                                WordList *keywordlists[], Accessor &styler) {
 167         ColouriseMatlabOctaveDoc(startPos, length, initStyle, keywordlists, styler, IsOctaveCommentChar);
 168 }
 169
 170 static void FoldMatlabOctaveDoc(unsigned int startPos, int length, int,
 171                                 WordList *[], Accessor &styler,
 172                                 bool (*IsComment)(Accessor&, int, int)) {
 173
 174         int endPos = startPos + length;
 175
 176         // Backtrack to previous line in case need to fix its fold status
 177         int lineCurrent = styler.GetLine(startPos);
 178         if (startPos > 0) {
 179                 if (lineCurrent > 0) {
 180                         lineCurrent--;
 181                         startPos = styler.LineStart(lineCurrent);
 182                 }
 183         }
 184         int spaceFlags = 0;
 185         int indentCurrent = styler.IndentAmount(lineCurrent, &spaceFlags, IsComment);
 186         char chNext = styler[startPos];
 187         for (int i = startPos; i < endPos; i++) {
 188                 char ch = chNext;
 189                 chNext = styler.SafeGetCharAt(i + 1);
 190
 191                 if ((ch == '\r' && chNext != '\n') || (ch == '\n') || (i == endPos)) {
 192                         int lev = indentCurrent;
 193                         int indentNext = styler.IndentAmount(lineCurrent + 1, &spaceFlags, IsComment);
 194                         if (!(indentCurrent & SC_FOLDLEVELWHITEFLAG)) {
 195                                 // Only non whitespace lines can be headers
 196                                 if ((indentCurrent & SC_FOLDLEVELNUMBERMASK) < (indentNext & SC_FOLDLEVELNUMBERMASK)) {
 197                                         lev |= SC_FOLDLEVELHEADERFLAG;
 198                                 } else if (indentNext & SC_FOLDLEVELWHITEFLAG) {
 199                                         // Line after is blank so check the next - maybe should continue further?
 200                                         int spaceFlags2 = 0;
 201                                         int indentNext2 = styler.IndentAmount(lineCurrent + 2, &spaceFlags2, IsComment);
 202                                         if ((indentCurrent & SC_FOLDLEVELNUMBERMASK) < (indentNext2 & SC_FOLDLEVELNUMBERMASK)) {
 203                                                 lev |= SC_FOLDLEVELHEADERFLAG;
 204                                         }
 205                                 }
 206                         }
 207                         indentCurrent = indentNext;
 208                         styler.SetLevel(lineCurrent, lev);
 209                         lineCurrent++;
 210                 }
 211         }
 212 }
 213
 214 static void FoldMatlabDoc(unsigned int startPos, int length, int initStyle,
 215                           WordList *keywordlists[], Accessor &styler) {
 216         FoldMatlabOctaveDoc(startPos, length, initStyle, keywordlists, styler, IsMatlabComment);
 217 }
 218
 219 static void FoldOctaveDoc(unsigned int startPos, int length, int initStyle,
 220                           WordList *keywordlists[], Accessor &styler) {
 221         FoldMatlabOctaveDoc(startPos, length, initStyle, keywordlists, styler, IsOctaveComment);
 222 }
 223
 224 static const char * const matlabWordListDesc[] = {
 225         "Keywords",
 226         0
 227 };
 228
 229 static const char * const octaveWordListDesc[] = {
 230         "Keywords",
 231         0
 232 };
 233
 234 LexerModule lmMatlab(SCLEX_MATLAB, ColouriseMatlabDoc, "matlab", FoldMatlabDoc, matlabWordListDesc);
 235
 236 LexerModule lmOctave(SCLEX_OCTAVE, ColouriseOctaveDoc, "octave", FoldOctaveDoc, octaveWordListDesc);