contrib/src/stc/scintilla/src/LexCPP.cxx

   1 // Scintilla source code edit control
   2 /** @file LexCPP.cxx
   3  ** Lexer for C++, C, Java, and Javascript.
   4  **/
   5 // Copyright 1998-2002 by Neil Hodgson <neilh@scintilla.org>
   6 // The License.txt file describes the conditions under which this software may be distributed.
   7
   8 #include <stdlib.h>
   9 #include <string.h>
  10 #include <ctype.h>
  11 #include <stdio.h>
  12 #include <stdarg.h>
  13
  14 #include "Platform.h"
  15
  16 #include "PropSet.h"
  17 #include "Accessor.h"
  18 #include "StyleContext.h"
  19 #include "KeyWords.h"
  20 #include "Scintilla.h"
  21 #include "SciLexer.h"
  22
  23 static bool IsOKBeforeRE(const int ch) {
  24         return (ch == '(') || (ch == '=') || (ch == ',');
  25 }
  26
  27 static inline bool IsAWordChar(const int ch) {
  28         return (ch < 0x80) && (isalnum(ch) || ch == '.' || ch == '_');
  29 }
  30
  31 static inline bool IsAWordStart(const int ch) {
  32         return (ch < 0x80) && (isalnum(ch) || ch == '_');
  33 }
  34
  35 static inline bool IsADoxygenChar(const int ch) {
  36         return (islower(ch) || ch == '$' || ch == '@' ||
  37                     ch == '\\' || ch == '&' || ch == '<' ||
  38                         ch == '>' || ch == '#' || ch == '{' ||
  39                         ch == '}' || ch == '[' || ch == ']');
  40 }
  41
  42 static inline bool IsStateComment(const int state) {
  43         return ((state == SCE_C_COMMENT) ||
  44                       (state == SCE_C_COMMENTLINE) ||
  45                       (state == SCE_C_COMMENTDOC) ||
  46                       (state == SCE_C_COMMENTDOCKEYWORD) ||
  47                       (state == SCE_C_COMMENTDOCKEYWORDERROR));
  48 }
  49
  50 static inline bool IsStateString(const int state) {
  51         return ((state == SCE_C_STRING) || (state == SCE_C_VERBATIM));
  52 }
  53
  54 static void ColouriseCppDoc(unsigned int startPos, int length, int initStyle, WordList *keywordlists[],
  55                             Accessor &styler) {
  56
  57         WordList &keywords = *keywordlists[0];
  58         WordList &keywords2 = *keywordlists[1];
  59         WordList &keywords3 = *keywordlists[2];
  60
  61         bool stylingWithinPreprocessor = styler.GetPropertyInt("styling.within.preprocessor") != 0;
  62
  63         // Do not leak onto next line
  64         if (initStyle == SCE_C_STRINGEOL)
  65                 initStyle = SCE_C_DEFAULT;
  66
  67         int chPrevNonWhite = ' ';
  68         int visibleChars = 0;
  69         bool lastWordWasUUID = false;
  70
  71         StyleContext sc(startPos, length, initStyle, styler);
  72
  73         for (; sc.More(); sc.Forward()) {
  74
  75                 // Handle line continuation generically.
  76                 if (sc.ch == '\\') {
  77                         if (sc.Match("\\\n")) {
  78                                 sc.Forward();
  79                                 sc.Forward();
  80                                 continue;
  81                         }
  82                         if (sc.Match("\\\r\n")) {
  83                                 sc.Forward();
  84                                 sc.Forward();
  85                                 sc.Forward();
  86                                 continue;
  87                         }
  88                 }
  89
  90                 // Determine if the current state should terminate.
  91                 if (sc.state == SCE_C_OPERATOR) {
  92                         sc.SetState(SCE_C_DEFAULT);
  93                 } else if (sc.state == SCE_C_NUMBER) {
  94                         if (!IsAWordChar(sc.ch)) {
  95                                 sc.SetState(SCE_C_DEFAULT);
  96                         }
  97                 } else if (sc.state == SCE_C_IDENTIFIER) {
  98                         if (!IsAWordChar(sc.ch) || (sc.ch == '.')) {
  99                                 char s[100];
 100                                 sc.GetCurrent(s, sizeof(s));
 101                                 if (keywords.InList(s)) {
 102                                         lastWordWasUUID = strcmp(s, "uuid") == 0;
 103                                         sc.ChangeState(SCE_C_WORD);
 104                                 } else if (keywords2.InList(s)) {
 105                                         sc.ChangeState(SCE_C_WORD2);
 106                                 }
 107                                 sc.SetState(SCE_C_DEFAULT);
 108                         }
 109                 } else if (sc.state == SCE_C_PREPROCESSOR) {
 110                         if (stylingWithinPreprocessor) {
 111                                 if (IsASpace(sc.ch)) {
 112                                         sc.SetState(SCE_C_DEFAULT);
 113                                 }
 114                         } else {
 115                                 if (sc.atLineEnd) {
 116                                         sc.SetState(SCE_C_DEFAULT);
 117                                 }
 118                         }
 119                 } else if (sc.state == SCE_C_COMMENT) {
 120                         if (sc.Match('*', '/')) {
 121                                 sc.Forward();
 122                                 sc.ForwardSetState(SCE_C_DEFAULT);
 123                         }
 124                 } else if (sc.state == SCE_C_COMMENTDOC) {
 125                         if (sc.Match('*', '/')) {
 126                                 sc.Forward();
 127                                 sc.ForwardSetState(SCE_C_DEFAULT);
 128                         } else if (sc.ch == '@' || sc.ch == '\\') {
 129                                 sc.SetState(SCE_C_COMMENTDOCKEYWORD);
 130                         }
 131                 } else if (sc.state == SCE_C_COMMENTLINE || sc.state == SCE_C_COMMENTLINEDOC) {
 132                         if (sc.atLineEnd) {
 133                                 sc.SetState(SCE_C_DEFAULT);
 134                                 visibleChars = 0;
 135                         }
 136                 } else if (sc.state == SCE_C_COMMENTDOCKEYWORD) {
 137                         if (sc.Match('*', '/')) {
 138                                 sc.ChangeState(SCE_C_COMMENTDOCKEYWORDERROR);
 139                                 sc.Forward();
 140                                 sc.ForwardSetState(SCE_C_DEFAULT);
 141                         } else if (!IsADoxygenChar(sc.ch)) {
 142                                 char s[100];
 143                                 sc.GetCurrent(s, sizeof(s));
 144                                 if (!isspace(sc.ch) || !keywords3.InList(s+1)) {
 145                                         sc.ChangeState(SCE_C_COMMENTDOCKEYWORDERROR);
 146                                 }
 147                                 sc.SetState(SCE_C_COMMENTDOC);
 148                         }
 149                 } else if (sc.state == SCE_C_STRING) {
 150                         if (sc.ch == '\\') {
 151                                 if (sc.chNext == '\"' || sc.chNext == '\'' || sc.chNext == '\\') {
 152                                         sc.Forward();
 153                                 }
 154                         } else if (sc.ch == '\"') {
 155                                 sc.ForwardSetState(SCE_C_DEFAULT);
 156                         } else if (sc.atLineEnd) {
 157                                 sc.ChangeState(SCE_C_STRINGEOL);
 158                                 sc.ForwardSetState(SCE_C_DEFAULT);
 159                                 visibleChars = 0;
 160                         }
 161                 } else if (sc.state == SCE_C_CHARACTER) {
 162                         if (sc.atLineEnd) {
 163                                 sc.ChangeState(SCE_C_STRINGEOL);
 164                                 sc.ForwardSetState(SCE_C_DEFAULT);
 165                                 visibleChars = 0;
 166                         } else if (sc.ch == '\\') {
 167                                 if (sc.chNext == '\"' || sc.chNext == '\'' || sc.chNext == '\\') {
 168                                         sc.Forward();
 169                                 }
 170                         } else if (sc.ch == '\'') {
 171                                 sc.ForwardSetState(SCE_C_DEFAULT);
 172                         }
 173                 } else if (sc.state == SCE_C_REGEX) {
 174                         if (sc.ch == '\r' || sc.ch == '\n' || sc.ch == '/') {
 175                                 sc.ForwardSetState(SCE_C_DEFAULT);
 176                         } else if (sc.ch == '\\') {
 177                                 // Gobble up the quoted character
 178                                 if (sc.chNext == '\\' || sc.chNext == '/') {
 179                                         sc.Forward();
 180                                 }
 181                         }
 182                 } else if (sc.state == SCE_C_VERBATIM) {
 183                         if (sc.ch == '\"') {
 184                                 if (sc.chNext == '\"') {
 185                                         sc.Forward();
 186                                 } else {
 187                                         sc.ForwardSetState(SCE_C_DEFAULT);
 188                                 }
 189                         }
 190                 } else if (sc.state == SCE_C_UUID) {
 191                         if (sc.ch == '\r' || sc.ch == '\n' || sc.ch == ')') {
 192                                 sc.SetState(SCE_C_DEFAULT);
 193                         }
 194                 }
 195
 196                 // Determine if a new state should be entered.
 197                 if (sc.state == SCE_C_DEFAULT) {
 198                         if (sc.Match('@', '\"')) {
 199                                 sc.SetState(SCE_C_VERBATIM);
 200                                 sc.Forward();
 201                         } else if (IsADigit(sc.ch) || (sc.ch == '.' && IsADigit(sc.chNext))) {
 202                                 if (lastWordWasUUID) {
 203                                         sc.SetState(SCE_C_UUID);
 204                                         lastWordWasUUID = false;
 205                                 } else {
 206                                         sc.SetState(SCE_C_NUMBER);
 207                                 }
 208                         } else if (IsAWordStart(sc.ch) || (sc.ch == '@')) {
 209                                 if (lastWordWasUUID) {
 210                                         sc.SetState(SCE_C_UUID);
 211                                         lastWordWasUUID = false;
 212                                 } else {
 213                                         sc.SetState(SCE_C_IDENTIFIER);
 214                                 }
 215                         } else if (sc.Match('/', '*')) {
 216                                 if (sc.Match("/**") || sc.Match("/*!")) {       // Support of Qt/Doxygen doc. style
 217                                         sc.SetState(SCE_C_COMMENTDOC);
 218                                 } else {
 219                                         sc.SetState(SCE_C_COMMENT);
 220                                 }
 221                                 sc.Forward();   // Eat the * so it isn't used for the end of the comment
 222                         } else if (sc.Match('/', '/')) {
 223                                 if (sc.Match("///") || sc.Match("//!")) // Support of Qt/Doxygen doc. style
 224                                         sc.SetState(SCE_C_COMMENTLINEDOC);
 225                                 else
 226                                         sc.SetState(SCE_C_COMMENTLINE);
 227                         } else if (sc.ch == '/' && IsOKBeforeRE(chPrevNonWhite)) {
 228                                 sc.SetState(SCE_C_REGEX);
 229                         } else if (sc.ch == '\"') {
 230                                 sc.SetState(SCE_C_STRING);
 231                         } else if (sc.ch == '\'') {
 232                                 sc.SetState(SCE_C_CHARACTER);
 233                         } else if (sc.ch == '#' && visibleChars == 0) {
 234                                 // Preprocessor commands are alone on their line
 235                                 sc.SetState(SCE_C_PREPROCESSOR);
 236                                 // Skip whitespace between # and preprocessor word
 237                                 do {
 238                                         sc.Forward();
 239                                 } while ((sc.ch == ' ') && (sc.ch == '\t') && sc.More());
 240                                 if (sc.atLineEnd) {
 241                                         sc.SetState(SCE_C_DEFAULT);
 242                                 }
 243                         } else if (isoperator(static_cast<char>(sc.ch))) {
 244                                 sc.SetState(SCE_C_OPERATOR);
 245                         }
 246                 }
 247
 248                 if (sc.atLineEnd) {
 249                         // Reset states to begining of colourise so no surprises
 250                         // if different sets of lines lexed.
 251                         chPrevNonWhite = ' ';
 252                         visibleChars = 0;
 253                         lastWordWasUUID = false;
 254                 }
 255                 if (!IsASpace(sc.ch)) {
 256                         chPrevNonWhite = sc.ch;
 257                         visibleChars++;
 258                 }
 259         }
 260         sc.Complete();
 261 }
 262
 263 static void FoldCppDoc(unsigned int startPos, int length, int initStyle, WordList *[],
 264                             Accessor &styler) {
 265         bool foldComment = styler.GetPropertyInt("fold.comment") != 0;
 266         bool foldCompact = styler.GetPropertyInt("fold.compact", 1) != 0;
 267         unsigned int endPos = startPos + length;
 268         int visibleChars = 0;
 269         int lineCurrent = styler.GetLine(startPos);
 270         int levelPrev = styler.LevelAt(lineCurrent) & SC_FOLDLEVELNUMBERMASK;
 271         int levelCurrent = levelPrev;
 272         char chNext = styler[startPos];
 273         int styleNext = styler.StyleAt(startPos);
 274         int style = initStyle;
 275         for (unsigned int i = startPos; i < endPos; i++) {
 276                 char ch = chNext;
 277                 chNext = styler.SafeGetCharAt(i + 1);
 278                 int stylePrev = style;
 279                 style = styleNext;
 280                 styleNext = styler.StyleAt(i + 1);
 281                 bool atEOL = (ch == '\r' && chNext != '\n') || (ch == '\n');
 282                 if (foldComment &&
 283                         (style == SCE_C_COMMENT || style == SCE_C_COMMENTDOC)) {
 284                         if (style != stylePrev) {
 285                                 levelCurrent++;
 286                         } else if ((style != styleNext) && !atEOL) {
 287                                 // Comments don't end at end of line and the next character may be unstyled.
 288                                 levelCurrent--;
 289                         }
 290                 }
 291                 if (style == SCE_C_OPERATOR) {
 292                         if (ch == '{') {
 293                                 levelCurrent++;
 294                         } else if (ch == '}') {
 295                                 levelCurrent--;
 296                         }
 297                 }
 298                 if (atEOL) {
 299                         int lev = levelPrev;
 300                         if (visibleChars == 0 && foldCompact)
 301                                 lev |= SC_FOLDLEVELWHITEFLAG;
 302                         if ((levelCurrent > levelPrev) && (visibleChars > 0))
 303                                 lev |= SC_FOLDLEVELHEADERFLAG;
 304                         if (lev != styler.LevelAt(lineCurrent)) {
 305                                 styler.SetLevel(lineCurrent, lev);
 306                         }
 307                         lineCurrent++;
 308                         levelPrev = levelCurrent;
 309                         visibleChars = 0;
 310                 }
 311                 if (!isspacechar(ch))
 312                         visibleChars++;
 313         }
 314         // Fill in the real level of the next line, keeping the current flags as they will be filled in later
 315         int flagsNext = styler.LevelAt(lineCurrent) & ~SC_FOLDLEVELNUMBERMASK;
 316         styler.SetLevel(lineCurrent, levelPrev | flagsNext);
 317 }
 318
 319 LexerModule lmCPP(SCLEX_CPP, ColouriseCppDoc, "cpp", FoldCppDoc);
 320 LexerModule lmTCL(SCLEX_TCL, ColouriseCppDoc, "tcl", FoldCppDoc);