src/stc/scintilla/src/LexVerilog.cxx

   1 // Scintilla source code edit control
   2 /** @file LexVerilog.cxx
   3  ** Lexer for Verilog.
   4  ** Written by Avi Yegudin, based on C++ lexer by Neil Hodgson
   5  **/
   6 // Copyright 1998-2002 by Neil Hodgson <neilh@scintilla.org>
   7 // The License.txt file describes the conditions under which this software may be distributed.
   8
   9 #include <stdlib.h>
  10 #include <string.h>
  11 #include <ctype.h>
  12 #include <stdio.h>
  13 #include <stdarg.h>
  14
  15 #include "Platform.h"
  16
  17 #include "PropSet.h"
  18 #include "Accessor.h"
  19 #include "StyleContext.h"
  20 #include "KeyWords.h"
  21 #include "Scintilla.h"
  22 #include "SciLexer.h"
  23
  24 #ifdef SCI_NAMESPACE
  25 using namespace Scintilla;
  26 #endif
  27
  28 static inline bool IsAWordChar(const int ch) {
  29         return (ch < 0x80) && (isalnum(ch) || ch == '.' || ch == '_' || ch == '\'');
  30 }
  31
  32 static inline bool IsAWordStart(const int ch) {
  33         return (ch < 0x80) && (isalnum(ch) || ch == '_' || ch == '$');
  34 }
  35
  36 static void ColouriseVerilogDoc(unsigned int startPos, int length, int initStyle, WordList *keywordlists[],
  37                             Accessor &styler) {
  38
  39         WordList &keywords = *keywordlists[0];
  40         WordList &keywords2 = *keywordlists[1];
  41         WordList &keywords3 = *keywordlists[2];
  42         WordList &keywords4 = *keywordlists[3];
  43
  44         // Do not leak onto next line
  45         if (initStyle == SCE_V_STRINGEOL)
  46                 initStyle = SCE_V_DEFAULT;
  47
  48         StyleContext sc(startPos, length, initStyle, styler);
  49
  50         for (; sc.More(); sc.Forward()) {
  51
  52                 if (sc.atLineStart && (sc.state == SCE_V_STRING)) {
  53                         // Prevent SCE_V_STRINGEOL from leaking back to previous line
  54                         sc.SetState(SCE_V_STRING);
  55                 }
  56
  57                 // Handle line continuation generically.
  58                 if (sc.ch == '\\') {
  59                         if (sc.chNext == '\n' || sc.chNext == '\r') {
  60                                 sc.Forward();
  61                                 if (sc.ch == '\r' && sc.chNext == '\n') {
  62                                         sc.Forward();
  63                                 }
  64                                 continue;
  65                         }
  66                 }
  67
  68                 // Determine if the current state should terminate.
  69                 if (sc.state == SCE_V_OPERATOR) {
  70                         sc.SetState(SCE_V_DEFAULT);
  71                 } else if (sc.state == SCE_V_NUMBER) {
  72                         if (!IsAWordChar(sc.ch)) {
  73                                 sc.SetState(SCE_V_DEFAULT);
  74                         }
  75                 } else if (sc.state == SCE_V_IDENTIFIER) {
  76                         if (!IsAWordChar(sc.ch) || (sc.ch == '.')) {
  77                                 char s[100];
  78                                 sc.GetCurrent(s, sizeof(s));
  79                                 if (keywords.InList(s)) {
  80                                         sc.ChangeState(SCE_V_WORD);
  81                                 } else if (keywords2.InList(s)) {
  82                                         sc.ChangeState(SCE_V_WORD2);
  83                                 } else if (keywords3.InList(s)) {
  84                                         sc.ChangeState(SCE_V_WORD3);
  85                                 } else if (keywords4.InList(s)) {
  86                                         sc.ChangeState(SCE_V_USER);
  87                                 }
  88                                 sc.SetState(SCE_V_DEFAULT);
  89                         }
  90                 } else if (sc.state == SCE_V_PREPROCESSOR) {
  91                         if (!IsAWordChar(sc.ch)) {
  92                                 sc.SetState(SCE_V_DEFAULT);
  93                         }
  94                 } else if (sc.state == SCE_V_COMMENT) {
  95                         if (sc.Match('*', '/')) {
  96                                 sc.Forward();
  97                                 sc.ForwardSetState(SCE_V_DEFAULT);
  98                         }
  99                 } else if (sc.state == SCE_V_COMMENTLINE || sc.state == SCE_V_COMMENTLINEBANG) {
 100                         if (sc.atLineStart) {
 101                                 sc.SetState(SCE_V_DEFAULT);
 102                         }
 103                 } else if (sc.state == SCE_V_STRING) {
 104                         if (sc.ch == '\\') {
 105                                 if (sc.chNext == '\"' || sc.chNext == '\'' || sc.chNext == '\\') {
 106                                         sc.Forward();
 107                                 }
 108                         } else if (sc.ch == '\"') {
 109                                 sc.ForwardSetState(SCE_V_DEFAULT);
 110                         } else if (sc.atLineEnd) {
 111                                 sc.ChangeState(SCE_V_STRINGEOL);
 112                                 sc.ForwardSetState(SCE_V_DEFAULT);
 113                         }
 114                 }
 115
 116                 // Determine if a new state should be entered.
 117                 if (sc.state == SCE_V_DEFAULT) {
 118                         if (IsADigit(sc.ch) || (sc.ch == '\'') || (sc.ch == '.' && IsADigit(sc.chNext))) {
 119                                 sc.SetState(SCE_V_NUMBER);
 120                         } else if (IsAWordStart(sc.ch)) {
 121                                 sc.SetState(SCE_V_IDENTIFIER);
 122                         } else if (sc.Match('/', '*')) {
 123                                 sc.SetState(SCE_V_COMMENT);
 124                                 sc.Forward();   // Eat the * so it isn't used for the end of the comment
 125                         } else if (sc.Match('/', '/')) {
 126                                 if (sc.Match("//!"))    // Nice to have a different comment style
 127                                         sc.SetState(SCE_V_COMMENTLINEBANG);
 128                                 else
 129                                         sc.SetState(SCE_V_COMMENTLINE);
 130                         } else if (sc.ch == '\"') {
 131                                 sc.SetState(SCE_V_STRING);
 132                         } else if (sc.ch == '`') {
 133                                 sc.SetState(SCE_V_PREPROCESSOR);
 134                                 // Skip whitespace between ` and preprocessor word
 135                                 do {
 136                                         sc.Forward();
 137                                 } while ((sc.ch == ' ' || sc.ch == '\t') && sc.More());
 138                                 if (sc.atLineEnd) {
 139                                         sc.SetState(SCE_V_DEFAULT);
 140                                 }
 141                         } else if (isoperator(static_cast<char>(sc.ch)) || sc.ch == '@' || sc.ch == '#') {
 142                                 sc.SetState(SCE_V_OPERATOR);
 143                         }
 144                 }
 145         }
 146         sc.Complete();
 147 }
 148
 149 static bool IsStreamCommentStyle(int style) {
 150         return style == SCE_V_COMMENT;
 151 }
 152
 153 // Store both the current line's fold level and the next lines in the
 154 // level store to make it easy to pick up with each increment
 155 // and to make it possible to fiddle the current level for "} else {".
 156 static void FoldNoBoxVerilogDoc(unsigned int startPos, int length, int initStyle,
 157                             Accessor &styler) {
 158         bool foldComment = styler.GetPropertyInt("fold.comment") != 0;
 159         bool foldPreprocessor = styler.GetPropertyInt("fold.preprocessor") != 0;
 160         bool foldCompact = styler.GetPropertyInt("fold.compact", 1) != 0;
 161         bool foldAtElse = styler.GetPropertyInt("fold.at.else", 0) != 0;
 162         // Verilog specific folding options:
 163         // fold_at_module -
 164         //      Generally used methodology in verilog code is
 165         //      one module per file, so folding at module definition is useless.
 166         // fold_at_brace/parenthese -
 167         //      Folding of long port lists can be convenient.
 168         bool foldAtModule = styler.GetPropertyInt("fold.verilog.flags", 0) != 0;
 169         bool foldAtBrace  = 1;
 170         bool foldAtParenthese  = 1;
 171
 172         unsigned int endPos = startPos + length;
 173         int visibleChars = 0;
 174         int lineCurrent = styler.GetLine(startPos);
 175         int levelCurrent = SC_FOLDLEVELBASE;
 176         if (lineCurrent > 0)
 177                 levelCurrent = styler.LevelAt(lineCurrent-1) >> 16;
 178         int levelMinCurrent = levelCurrent;
 179         int levelNext = levelCurrent;
 180         char chNext = styler[startPos];
 181         int styleNext = styler.StyleAt(startPos);
 182         int style = initStyle;
 183         for (unsigned int i = startPos; i < endPos; i++) {
 184                 char ch = chNext;
 185                 chNext = styler.SafeGetCharAt(i + 1);
 186                 int stylePrev = style;
 187                 style = styleNext;
 188                 styleNext = styler.StyleAt(i + 1);
 189                 bool atEOL = (ch == '\r' && chNext != '\n') || (ch == '\n');
 190                 if (foldComment && IsStreamCommentStyle(style)) {
 191                         if (!IsStreamCommentStyle(stylePrev)) {
 192                                 levelNext++;
 193                         } else if (!IsStreamCommentStyle(styleNext) && !atEOL) {
 194                                 // Comments don't end at end of line and the next character may be unstyled.
 195                                 levelNext--;
 196                         }
 197                 }
 198                 if (foldComment && (style == SCE_V_COMMENTLINE)) {
 199                         if ((ch == '/') && (chNext == '/')) {
 200                                 char chNext2 = styler.SafeGetCharAt(i + 2);
 201                                 if (chNext2 == '{') {
 202                                         levelNext++;
 203                                 } else if (chNext2 == '}') {
 204                                         levelNext--;
 205                                 }
 206                         }
 207                 }
 208                 if (foldPreprocessor && (style == SCE_V_PREPROCESSOR)) {
 209                         if (ch == '`') {
 210                                 unsigned int j = i + 1;
 211                                 while ((j < endPos) && IsASpaceOrTab(styler.SafeGetCharAt(j))) {
 212                                         j++;
 213                                 }
 214                                 if (styler.Match(j, "if")) {
 215                                         levelNext++;
 216                                 } else if (styler.Match(j, "end")) {
 217                                         levelNext--;
 218                                 }
 219                         }
 220                 }
 221                 if (style == SCE_V_OPERATOR) {
 222                     if (foldAtParenthese) {
 223                         if (ch == '(') {
 224                                 levelNext++;
 225                         } else if (ch == ')') {
 226                                 levelNext--;
 227                         }
 228                     }
 229                 }
 230                 if (style == SCE_V_OPERATOR) {
 231                     if (foldAtBrace) {
 232                         if (ch == '{') {
 233                                 levelNext++;
 234                         } else if (ch == '}') {
 235                                 levelNext--;
 236                         }
 237                     }
 238                 }
 239                 if (style == SCE_V_WORD && stylePrev != SCE_V_WORD) {
 240                         unsigned int j = i;
 241                         if (styler.Match(j, "case") ||
 242                             styler.Match(j, "casex") ||
 243                             styler.Match(j, "casez") ||
 244                             styler.Match(j, "function") ||
 245                             styler.Match(j, "fork") ||
 246                             styler.Match(j, "table") ||
 247                             styler.Match(j, "task") ||
 248                             styler.Match(j, "generate") ||
 249                             styler.Match(j, "specify") ||
 250                             styler.Match(j, "primitive") ||
 251                             (styler.Match(j, "module") && foldAtModule) ||
 252                             styler.Match(j, "begin")) {
 253                                 levelNext++;
 254                         } else if (styler.Match(j, "endcase") ||
 255                                    styler.Match(j, "endfunction") ||
 256                                    styler.Match(j, "join") ||
 257                                    styler.Match(j, "endtask") ||
 258                                    styler.Match(j, "endgenerate") ||
 259                                    styler.Match(j, "endtable") ||
 260                                    styler.Match(j, "endspecify") ||
 261                                    styler.Match(j, "endprimitive") ||
 262                                    (styler.Match(j, "endmodule") && foldAtModule) ||
 263                                    (styler.Match(j, "end") && !IsAWordChar(styler.SafeGetCharAt(j+3)))) {
 264                                 levelNext--;
 265                         }
 266                 }
 267                 if (atEOL) {
 268                         int levelUse = levelCurrent;
 269                         if (foldAtElse) {
 270                                 levelUse = levelMinCurrent;
 271                         }
 272                         int lev = levelUse | levelNext << 16;
 273                         if (visibleChars == 0 && foldCompact)
 274                                 lev |= SC_FOLDLEVELWHITEFLAG;
 275                         if (levelUse < levelNext)
 276                                 lev |= SC_FOLDLEVELHEADERFLAG;
 277                         if (lev != styler.LevelAt(lineCurrent)) {
 278                                 styler.SetLevel(lineCurrent, lev);
 279                         }
 280                         lineCurrent++;
 281                         levelCurrent = levelNext;
 282                         levelMinCurrent = levelCurrent;
 283                         visibleChars = 0;
 284                 }
 285                 if (!isspacechar(ch))
 286                         visibleChars++;
 287         }
 288 }
 289
 290 static void FoldVerilogDoc(unsigned int startPos, int length, int initStyle, WordList *[],
 291                        Accessor &styler) {
 292         FoldNoBoxVerilogDoc(startPos, length, initStyle, styler);
 293 }
 294
 295 static const char * const verilogWordLists[] = {
 296             "Primary keywords and identifiers",
 297             "Secondary keywords and identifiers",
 298             "System Tasks",
 299             "User defined tasks and identifiers",
 300             "Unused",
 301             0,
 302         };
 303
 304
 305 LexerModule lmVerilog(SCLEX_VERILOG, ColouriseVerilogDoc, "verilog", FoldVerilogDoc, verilogWordLists);