src/stc/scintilla/lexers/LexVHDL.cxx

   1 // Scintilla source code edit control
   2 /** @file LexVHDL.cxx
   3  ** Lexer for VHDL
   4  ** Written by Phil Reid,
   5  ** Based on:
   6  **  - The Verilog Lexer by Avi Yegudin
   7  **  - The Fortran Lexer by Chuan-jian Shen
   8  **  - The C++ lexer by Neil Hodgson
   9  **/
  10 // Copyright 1998-2002 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 #include <assert.h>
  19
  20 #include "ILexer.h"
  21 #include "Scintilla.h"
  22 #include "SciLexer.h"
  23
  24 #include "WordList.h"
  25 #include "LexAccessor.h"
  26 #include "Accessor.h"
  27 #include "StyleContext.h"
  28 #include "CharacterSet.h"
  29 #include "LexerModule.h"
  30
  31 #ifdef SCI_NAMESPACE
  32 using namespace Scintilla;
  33 #endif
  34
  35 static void ColouriseVHDLDoc(
  36   unsigned int startPos,
  37   int length,
  38   int initStyle,
  39   WordList *keywordlists[],
  40   Accessor &styler);
  41
  42
  43 /***************************************/
  44 static inline bool IsAWordChar(const int ch) {
  45   return (ch < 0x80) && (isalnum(ch) || ch == '.' || ch == '_' );
  46 }
  47
  48 /***************************************/
  49 static inline bool IsAWordStart(const int ch) {
  50   return (ch < 0x80) && (isalnum(ch) || ch == '_');
  51 }
  52
  53 /***************************************/
  54 inline bool IsABlank(unsigned int ch) {
  55     return (ch == ' ') || (ch == 0x09) || (ch == 0x0b) ;
  56 }
  57
  58 /***************************************/
  59 static void ColouriseVHDLDoc(
  60   unsigned int startPos,
  61   int length,
  62   int initStyle,
  63   WordList *keywordlists[],
  64   Accessor &styler)
  65 {
  66   WordList &Keywords   = *keywordlists[0];
  67   WordList &Operators  = *keywordlists[1];
  68   WordList &Attributes = *keywordlists[2];
  69   WordList &Functions  = *keywordlists[3];
  70   WordList &Packages   = *keywordlists[4];
  71   WordList &Types      = *keywordlists[5];
  72   WordList &User       = *keywordlists[6];
  73
  74   StyleContext sc(startPos, length, initStyle, styler);
  75
  76   for (; sc.More(); sc.Forward())
  77   {
  78
  79     // Determine if the current state should terminate.
  80     if (sc.state == SCE_VHDL_OPERATOR) {
  81       sc.SetState(SCE_VHDL_DEFAULT);
  82     } else if (sc.state == SCE_VHDL_NUMBER) {
  83       if (!IsAWordChar(sc.ch) && (sc.ch != '#')) {
  84         sc.SetState(SCE_VHDL_DEFAULT);
  85       }
  86     } else if (sc.state == SCE_VHDL_IDENTIFIER) {
  87       if (!IsAWordChar(sc.ch) || (sc.ch == '.')) {
  88         char s[100];
  89         sc.GetCurrentLowered(s, sizeof(s));
  90         if (Keywords.InList(s)) {
  91           sc.ChangeState(SCE_VHDL_KEYWORD);
  92         } else if (Operators.InList(s)) {
  93           sc.ChangeState(SCE_VHDL_STDOPERATOR);
  94         } else if (Attributes.InList(s)) {
  95           sc.ChangeState(SCE_VHDL_ATTRIBUTE);
  96         } else if (Functions.InList(s)) {
  97           sc.ChangeState(SCE_VHDL_STDFUNCTION);
  98         } else if (Packages.InList(s)) {
  99           sc.ChangeState(SCE_VHDL_STDPACKAGE);
 100         } else if (Types.InList(s)) {
 101           sc.ChangeState(SCE_VHDL_STDTYPE);
 102         } else if (User.InList(s)) {
 103           sc.ChangeState(SCE_VHDL_USERWORD);
 104         }
 105         sc.SetState(SCE_VHDL_DEFAULT);
 106       }
 107     } else if (sc.state == SCE_VHDL_COMMENT || sc.state == SCE_VHDL_COMMENTLINEBANG) {
 108       if (sc.atLineEnd) {
 109         sc.SetState(SCE_VHDL_DEFAULT);
 110       }
 111     } else if (sc.state == SCE_VHDL_STRING) {
 112       if (sc.ch == '\\') {
 113         if (sc.chNext == '\"' || sc.chNext == '\'' || sc.chNext == '\\') {
 114           sc.Forward();
 115         }
 116       } else if (sc.ch == '\"') {
 117         sc.ForwardSetState(SCE_VHDL_DEFAULT);
 118       } else if (sc.atLineEnd) {
 119         sc.ChangeState(SCE_VHDL_STRINGEOL);
 120         sc.ForwardSetState(SCE_VHDL_DEFAULT);
 121       }
 122     }
 123
 124     // Determine if a new state should be entered.
 125     if (sc.state == SCE_VHDL_DEFAULT) {
 126       if (IsADigit(sc.ch) || (sc.ch == '.' && IsADigit(sc.chNext))) {
 127         sc.SetState(SCE_VHDL_NUMBER);
 128       } else if (IsAWordStart(sc.ch)) {
 129         sc.SetState(SCE_VHDL_IDENTIFIER);
 130       } else if (sc.Match('-', '-')) {
 131         if (sc.Match("--!"))  // Nice to have a different comment style
 132           sc.SetState(SCE_VHDL_COMMENTLINEBANG);
 133         else
 134           sc.SetState(SCE_VHDL_COMMENT);
 135       } else if (sc.ch == '\"') {
 136         sc.SetState(SCE_VHDL_STRING);
 137       } else if (isoperator(static_cast<char>(sc.ch))) {
 138         sc.SetState(SCE_VHDL_OPERATOR);
 139       }
 140     }
 141   }
 142   sc.Complete();
 143 }
 144 //=============================================================================
 145 static bool IsCommentLine(int line, Accessor &styler) {
 146         int pos = styler.LineStart(line);
 147         int eol_pos = styler.LineStart(line + 1) - 1;
 148         for (int i = pos; i < eol_pos; i++) {
 149                 char ch = styler[i];
 150                 char chNext = styler[i+1];
 151                 if ((ch == '-') && (chNext == '-'))
 152                         return true;
 153                 else if (ch != ' ' && ch != '\t')
 154                         return false;
 155         }
 156         return false;
 157 }
 158
 159 //=============================================================================
 160 // Folding the code
 161 static void FoldNoBoxVHDLDoc(
 162   unsigned int startPos,
 163   int length,
 164   int,
 165   Accessor &styler)
 166 {
 167   // Decided it would be smarter to have the lexer have all keywords included. Therefore I
 168   // don't check if the style for the keywords that I use to adjust the levels.
 169   char words[] =
 170     "architecture begin case component else elsif end entity generate loop package process record then "
 171     "procedure function when";
 172   WordList keywords;
 173   keywords.Set(words);
 174
 175   bool foldComment      = styler.GetPropertyInt("fold.comment", 1) != 0;
 176   bool foldCompact      = styler.GetPropertyInt("fold.compact", 1) != 0;
 177   bool foldAtElse       = styler.GetPropertyInt("fold.at.else", 1) != 0;
 178   bool foldAtBegin      = styler.GetPropertyInt("fold.at.Begin", 1) != 0;
 179   bool foldAtParenthese = styler.GetPropertyInt("fold.at.Parenthese", 1) != 0;
 180   //bool foldAtWhen       = styler.GetPropertyInt("fold.at.When", 1) != 0;  //< fold at when in case statements
 181
 182   int  visibleChars     = 0;
 183   unsigned int endPos   = startPos + length;
 184
 185   int lineCurrent       = styler.GetLine(startPos);
 186   int levelCurrent      = SC_FOLDLEVELBASE;
 187   if(lineCurrent > 0)
 188     levelCurrent        = styler.LevelAt(lineCurrent-1) >> 16;
 189   //int levelMinCurrent   = levelCurrent;
 190   int levelMinCurrentElse = levelCurrent;   //< Used for folding at 'else'
 191   int levelMinCurrentBegin = levelCurrent;  //< Used for folding at 'begin'
 192   int levelNext         = levelCurrent;
 193
 194   /***************************************/
 195   int lastStart         = 0;
 196   char prevWord[32]     = "";
 197
 198   /***************************************/
 199   // Find prev word
 200   // The logic for going up or down a level depends on a the previous keyword
 201   // This code could be cleaned up.
 202   int end = 0;
 203   unsigned int j;
 204   for(j = startPos; j>0; j--)
 205   {
 206     char ch       = styler.SafeGetCharAt(j);
 207     char chPrev   = styler.SafeGetCharAt(j-1);
 208     int style     = styler.StyleAt(j);
 209     int stylePrev = styler.StyleAt(j-1);
 210     if ((stylePrev != SCE_VHDL_COMMENT) && (stylePrev != SCE_VHDL_STRING))
 211     {
 212       if(IsAWordChar(chPrev) && !IsAWordChar(ch))
 213       {
 214         end = j-1;
 215       }
 216     }
 217     if ((style != SCE_VHDL_COMMENT) && (style != SCE_VHDL_STRING))
 218     {
 219       if(!IsAWordChar(chPrev) && IsAWordStart(ch) && (end != 0))
 220       {
 221         char s[32];
 222         unsigned int k;
 223         for(k=0; (k<31 ) && (k<end-j+1 ); k++) {
 224           s[k] = static_cast<char>(tolower(styler[j+k]));
 225         }
 226         s[k] = '\0';
 227
 228         if(keywords.InList(s)) {
 229           strcpy(prevWord, s);
 230           break;
 231         }
 232       }
 233     }
 234   }
 235   for(j=j+static_cast<unsigned int>(strlen(prevWord)); j<endPos; j++)
 236   {
 237     char ch       = styler.SafeGetCharAt(j);
 238     int style     = styler.StyleAt(j);
 239     if ((style != SCE_VHDL_COMMENT) && (style != SCE_VHDL_STRING))
 240     {
 241       if((ch == ';') && (strcmp(prevWord, "end") == 0))
 242       {
 243         strcpy(prevWord, ";");
 244       }
 245     }
 246   }
 247
 248   char  chNext          = styler[startPos];
 249   char  chPrev          = '\0';
 250   char  chNextNonBlank;
 251   int   styleNext       = styler.StyleAt(startPos);
 252   //Platform::DebugPrintf("Line[%04d] Prev[%20s] ************************* Level[%x]\n", lineCurrent+1, prevWord, levelCurrent);
 253
 254   /***************************************/
 255   for (unsigned int i = startPos; i < endPos; i++)
 256   {
 257     char ch         = chNext;
 258     chNext          = styler.SafeGetCharAt(i + 1);
 259     chPrev          = styler.SafeGetCharAt(i - 1);
 260     chNextNonBlank  = chNext;
 261     unsigned int j  = i+1;
 262     while(IsABlank(chNextNonBlank) && j<endPos)
 263     {
 264       j ++ ;
 265       chNextNonBlank = styler.SafeGetCharAt(j);
 266     }
 267     int style           = styleNext;
 268     styleNext       = styler.StyleAt(i + 1);
 269     bool atEOL      = (ch == '\r' && chNext != '\n') || (ch == '\n');
 270
 271                 if (foldComment && atEOL && IsCommentLine(lineCurrent, styler))
 272     {
 273       if(!IsCommentLine(lineCurrent-1, styler) && IsCommentLine(lineCurrent+1, styler))
 274       {
 275         levelNext++;
 276       }
 277       else if(IsCommentLine(lineCurrent-1, styler) && !IsCommentLine(lineCurrent+1, styler))
 278       {
 279         levelNext--;
 280       }
 281     }
 282
 283     if ((style == SCE_VHDL_OPERATOR) && foldAtParenthese)
 284     {
 285       if(ch == '(') {
 286         levelNext++;
 287       } else if (ch == ')') {
 288         levelNext--;
 289       }
 290     }
 291
 292     if ((style != SCE_VHDL_COMMENT) && (style != SCE_VHDL_STRING))
 293     {
 294       if((ch == ';') && (strcmp(prevWord, "end") == 0))
 295       {
 296         strcpy(prevWord, ";");
 297       }
 298
 299       if(!IsAWordChar(chPrev) && IsAWordStart(ch))
 300       {
 301         lastStart = i;
 302       }
 303
 304       if(iswordchar(ch) && !iswordchar(chNext)) {
 305         char s[32];
 306         unsigned int k;
 307         for(k=0; (k<31 ) && (k<i-lastStart+1 ); k++) {
 308           s[k] = static_cast<char>(tolower(styler[lastStart+k]));
 309         }
 310         s[k] = '\0';
 311
 312         if(keywords.InList(s))
 313         {
 314           if (
 315             strcmp(s, "architecture") == 0  ||
 316             strcmp(s, "case") == 0          ||
 317             strcmp(s, "component") == 0     ||
 318             strcmp(s, "entity") == 0        ||
 319             strcmp(s, "generate") == 0      ||
 320             strcmp(s, "loop") == 0          ||
 321             strcmp(s, "package") ==0        ||
 322             strcmp(s, "process") == 0       ||
 323             strcmp(s, "record") == 0        ||
 324             strcmp(s, "then") == 0)
 325           {
 326             if (strcmp(prevWord, "end") != 0)
 327             {
 328               if (levelMinCurrentElse > levelNext) {
 329                 levelMinCurrentElse = levelNext;
 330               }
 331               levelNext++;
 332             }
 333           } else if (
 334             strcmp(s, "procedure") == 0     ||
 335             strcmp(s, "function") == 0)
 336           {
 337             if (strcmp(prevWord, "end") != 0) // check for "end procedure" etc.
 338             { // This code checks to see if the procedure / function is a definition within a "package"
 339               // rather than the actual code in the body.
 340               int BracketLevel = 0;
 341               for(int j=i+1; j<styler.Length(); j++)
 342               {
 343                 int LocalStyle = styler.StyleAt(j);
 344                 char LocalCh = styler.SafeGetCharAt(j);
 345                 if(LocalCh == '(') BracketLevel++;
 346                 if(LocalCh == ')') BracketLevel--;
 347                 if(
 348                   (BracketLevel == 0) &&
 349                   (LocalStyle != SCE_VHDL_COMMENT) &&
 350                   (LocalStyle != SCE_VHDL_STRING) &&
 351                   !iswordchar(styler.SafeGetCharAt(j-1)) &&
 352                   styler.Match(j, "is") &&
 353                   !iswordchar(styler.SafeGetCharAt(j+2)))
 354                 {
 355                   if (levelMinCurrentElse > levelNext) {
 356                     levelMinCurrentElse = levelNext;
 357                   }
 358                   levelNext++;
 359                   break;
 360                 }
 361                 if((BracketLevel == 0) && (LocalCh == ';'))
 362                 {
 363                   break;
 364                 }
 365               }
 366             }
 367
 368           } else if (strcmp(s, "end") == 0) {
 369             levelNext--;
 370           }  else if(strcmp(s, "elsif") == 0) { // elsif is followed by then so folding occurs correctly
 371             levelNext--;
 372           } else if (strcmp(s, "else") == 0) {
 373             if(strcmp(prevWord, "when") != 0)  // ignore a <= x when y else z;
 374             {
 375               levelMinCurrentElse = levelNext - 1;  // VHDL else is all on its own so just dec. the min level
 376             }
 377           } else if(
 378             ((strcmp(s, "begin") == 0) && (strcmp(prevWord, "architecture") == 0)) ||
 379             ((strcmp(s, "begin") == 0) && (strcmp(prevWord, "function") == 0)) ||
 380             ((strcmp(s, "begin") == 0) && (strcmp(prevWord, "procedure") == 0)))
 381           {
 382             levelMinCurrentBegin = levelNext - 1;
 383           }
 384           //Platform::DebugPrintf("Line[%04d] Prev[%20s] Cur[%20s] Level[%x]\n", lineCurrent+1, prevWord, s, levelCurrent);
 385           strcpy(prevWord, s);
 386         }
 387       }
 388     }
 389     if (atEOL) {
 390       int levelUse = levelCurrent;
 391
 392       if (foldAtElse && (levelMinCurrentElse < levelUse)) {
 393         levelUse = levelMinCurrentElse;
 394       }
 395       if (foldAtBegin && (levelMinCurrentBegin < levelUse)) {
 396         levelUse = levelMinCurrentBegin;
 397       }
 398       int lev = levelUse | levelNext << 16;
 399       if (visibleChars == 0 && foldCompact)
 400         lev |= SC_FOLDLEVELWHITEFLAG;
 401
 402       if (levelUse < levelNext)
 403         lev |= SC_FOLDLEVELHEADERFLAG;
 404       if (lev != styler.LevelAt(lineCurrent)) {
 405         styler.SetLevel(lineCurrent, lev);
 406       }
 407       //Platform::DebugPrintf("Line[%04d] ---------------------------------------------------- Level[%x]\n", lineCurrent+1, levelCurrent);
 408       lineCurrent++;
 409       levelCurrent = levelNext;
 410       //levelMinCurrent = levelCurrent;
 411       levelMinCurrentElse = levelCurrent;
 412       levelMinCurrentBegin = levelCurrent;
 413       visibleChars = 0;
 414     }
 415     /***************************************/
 416     if (!isspacechar(ch)) visibleChars++;
 417   }
 418
 419   /***************************************/
 420 //  Platform::DebugPrintf("Line[%04d] ---------------------------------------------------- Level[%x]\n", lineCurrent+1, levelCurrent);
 421 }
 422
 423 //=============================================================================
 424 static void FoldVHDLDoc(unsigned int startPos, int length, int initStyle, WordList *[],
 425                        Accessor &styler) {
 426   FoldNoBoxVHDLDoc(startPos, length, initStyle, styler);
 427 }
 428
 429 //=============================================================================
 430 static const char * const VHDLWordLists[] = {
 431             "Keywords",
 432             "Operators",
 433             "Attributes",
 434             "Standard Functions",
 435             "Standard Packages",
 436             "Standard Types",
 437             "User Words",
 438             0,
 439         };
 440
 441
 442 LexerModule lmVHDL(SCLEX_VHDL, ColouriseVHDLDoc, "vhdl", FoldVHDLDoc, VHDLWordLists);
 443
 444
 445 // Keyword:
 446 //    access after alias all architecture array assert attribute begin block body buffer bus case component
 447 //    configuration constant disconnect downto else elsif end entity exit file for function generate generic
 448 //    group guarded if impure in inertial inout is label library linkage literal loop map new next null of
 449 //    on open others out package port postponed procedure process pure range record register reject report
 450 //    return select severity shared signal subtype then to transport type unaffected units until use variable
 451 //    wait when while with
 452 //
 453 // Operators:
 454 //    abs and mod nand nor not or rem rol ror sla sll sra srl xnor xor
 455 //
 456 // Attributes:
 457 //    left right low high ascending image value pos val succ pred leftof rightof base range reverse_range
 458 //    length delayed stable quiet transaction event active last_event last_active last_value driving
 459 //    driving_value simple_name path_name instance_name
 460 //
 461 // Std Functions:
 462 //    now readline read writeline write endfile resolved to_bit to_bitvector to_stdulogic to_stdlogicvector
 463 //    to_stdulogicvector to_x01 to_x01z to_UX01 rising_edge falling_edge is_x shift_left shift_right rotate_left
 464 //    rotate_right resize to_integer to_unsigned to_signed std_match to_01
 465 //
 466 // Std Packages:
 467 //    std ieee work standard textio std_logic_1164 std_logic_arith std_logic_misc std_logic_signed
 468 //    std_logic_textio std_logic_unsigned numeric_bit numeric_std math_complex math_real vital_primitives
 469 //    vital_timing
 470 //
 471 // Std Types:
 472 //    boolean bit character severity_level integer real time delay_length natural positive string bit_vector
 473 //    file_open_kind file_open_status line text side width std_ulogic std_ulogic_vector std_logic
 474 //    std_logic_vector X01 X01Z UX01 UX01Z unsigned signed
 475 //
 476